Attachment 345817 Details for Bug 187333 – Patch

[patch] Patch

bug-187333-20180725210644.patch (text/plain), 375.54 KB, created by Darin Adler on 2018-07-25 21:06:50 PDT

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Creator: Darin Adler

Created: 2018-07-25 21:06:50 PDT

Size: 375.54 KB

patch

obsolete

>Subversion Revision: 234228
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index 52ada99d91168683a2742f4ead1d1df42aaa74d3..91f459deff261efeb84a899db345a1946d5cf94a 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,17 @@
>+2018-07-04  Darin Adler  <darin@apple.com>
>+
>+        Improve WebGPU implementation, including using Metal Objective-C protocols more simply and correctly
>+        https://bugs.webkit.org/show_bug.cgi?id=187333
>+
>+        Reviewed by Sam Weinig.
>+
>+        * wtf/Compiler.h: Added OBJC_PROTOCOL, a macro for convieniently treating an
>+        Objective-C protocol in a way that lets it be mentioned in a C++ source file.
>+        This is the rough equivalent of OBJC_CLASS, but for protocols.
>+
>+        * wtf/Platform.h: Added USE(METAL), alongside USE(OPENGL) and the like.
>+        Now used in the WebGPU platform layer to guard the Metal-specific code.
>+
> 2018-07-25  Tomas Popela  <tpopela@redhat.com>
> 
>         Correctly close the variable argument list
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index e16c2a630fba747f0f52ebd07183f6e7cca57d3f..30442474fe192fe535aca66967144723ca2c0803 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,507 @@
>+2018-07-04  Darin Adler  <darin@apple.com>
>+
>+        Improve WebGPU implementation, including using Metal Objective-C protocols more simply and correctly
>+        https://bugs.webkit.org/show_bug.cgi?id=187333
>+
>+        Reviewed by Sam Weinig.
>+
>+        - Used a new OBJC_PROTOCOL macro to handle things in the Metal API that are protocols.
>+          The code previously had used OBJC_CLASS, but that created unrelated classes.
>+          Fixing this allows removing many typecasts that were in the existing code, makes it
>+          ARC-compatible, and also allowed the compiler to detect a couple mistakes where we
>+          were calling methods that don't exist.
>+
>+        - Nearly eliminated use of separate heap-allocated, reference-counted objects to
>+          hold pointers to Metal objects. Only needed to keep it in one case, GPUCommandBuffer,
>+          where we use it to make the lifetime for a DOM promise work.
>+
>+        - Reduced the use of the WebGPU wrappers to pass around arguments inside the code.
>+          They are now used only as part of the DOM binding; the inner GPU objects are used
>+          whenever possible. This cuts down the number of separate functions needed a bit,
>+          since we don't always need accessors for the things inside the wrappers.
>+
>+        - Used references rather than pointers in many cases.
>+
>+        - Took out three kinds of null checks: 1) Unneeded ones since Objective-C has the
>+          "do nothing and return 0" behavior for methods without return values and that return
>+          integer scalars. 2) Checks that aren't needed because the code has clear, invariant
>+          guarantees that the pointer won't be null. 3) The simplest variant of (2), checks
>+          that can be obviated by using reference types instead of pointer types.
>+
>+        - For Metal-specific functions and data members, used the function name metal() and
>+          the data member name m_metal rather than longer wordier names with the word "platform"
>+          in them. We could use "platform" if these objects were platform-specific objects used
>+          in a cross-platform way that needed a common name. But in this case it's clearer to
>+          call them "metal" since we are dropping down to the metal with Metal API, and
>+          shared platform-independent code will not be accessing these.
>+
>+        - Fixed the common mistake of using "unsigned long" in our C++ code to match IDL.
>+          The "unsigned long" type in IDL correponds to the "unsigned" type in WebKit code.
>+
>+        - Used "const" more in the GPU functions that are wrappers around Metal objects to
>+          reflect the fact that these have semantics of smart pointers; most operations can be
>+          done without changing which object is pointed to. This allows us to use const
>+          references to pass things around without reference count churn.
>+
>+        - Reduced includes.
>+
>+        - Added "explicit" keywords where appropriate.
>+
>+        - Removed unused functions. In particular, removed non-Metal stub versions of the
>+          functions in the GPU classes: the right way to start a new port is to clone the
>+          Metal-specific files and turn the into stubs if needed, it does not make it
>+          significantly more convenient to have stubs in the platform independent files,
>+          especially ones that are not compiled for any platform.
>+
>+        - Removed most the WEBCORE_EXPORT in the GPU headers; left only what's needed to
>+          support testing with TestWebKitAPI.
>+
>+        - Fixed two storage leaks in GPUDevice by adding missing adoptNS.
>+
>+        * PlatformMac.cmake: Moved files from platform/graphics/cocoa to platform/graphics/metal.
>+        * SourcesCocoa.txt: Ditto.
>+        * WebCore.xcodeproj/project.pbxproj: Ditto. Fixed paths on some files and groups/directories.
>+        Made the platform files that abstract GPU all be "project" visible, not "private", since
>+        they don't need to be visible outside WebCore. Removed reference to FontSelectionKeywordValues.h,
>+        which does not seem to be a source file, a derived source file, or mentioned in any change log.
>+
>+        * bindings/js/JSWebGPURenderPassAttachmentDescriptorCustom.cpp:
>+        (WebCore::toJSNewlyCreated): Create the correct wrapper for a
>+        WebGPURenderPassDepthAttachmentDescriptor. The old code would instead
>+        create a WebGPURenderPassAttachmentDescriptor wrapper, which can't be
>+        used to access the clearDepth attribute.
>+
>+        * html/canvas/WebGPUBuffer.cpp:
>+        (WebCore::WebGPUBuffer::create): Use more references rather than pointers for things
>+        that are never null. Added comment about possibly returning null on failure in future.
>+        (WebCore::WebGPUBuffer::WebGPUBuffer): Updated to store the GPUBuffer inside the class
>+        instead of in a separate reference counted object.
>+        * html/canvas/WebGPUBuffer.h: Ditto.
>+
>+        * html/canvas/WebGPUCommandBuffer.cpp:
>+        (WebCore::WebGPUCommandBuffer::create): Use references and lower level types.
>+        (WebCore::WebGPUCommandBuffer::WebGPUCommandBuffer): Store the GPUCommandBuffer
>+        inside the class.
>+        (WebCore::WebGPUCommandBuffer::commit): Removed unneeded null checks.
>+        (WebCore::WebGPUCommandBuffer::presentDrawable): Ditto.
>+        (WebCore::WebGPUCommandBuffer::createRenderCommandEncoderWithDescriptor):
>+        Removed unneeded local variable.
>+        (WebCore::WebGPUCommandBuffer::createComputeCommandEncoder): Ditto.
>+        (WebCore::WebGPUCommandBuffer::completed): Store the DOMPromiseProxy in this
>+        class, not in GPUCommandBuffer.
>+        * html/canvas/WebGPUCommandBuffer.h: Ditto.
>+
>+        * html/canvas/WebGPUCommandQueue.cpp:
>+        (WebCore::WebGPUCommandQueue::create): Use references and lower level types.
>+        (WebCore::WebGPUCommandQueue::WebGPUCommandQueue): Store the GPUCommandQueue
>+        inside the class.
>+        (WebCore::WebGPUCommandQueue::createCommandBuffer): Ditto.
>+        * html/canvas/WebGPUCommandQueue.h: Ditto.
>+        * html/canvas/WebGPUCommandQueue.idl: The return value of createCommandBuffer
>+        is no longer nullable.
>+
>+        * html/canvas/WebGPUComputeCommandEncoder.cpp:
>+        (WebCore::WebGPUComputeCommandEncoder::create): More of the same.
>+        (WebCore::WebGPUComputeCommandEncoder::WebGPUComputeCommandEncoder): Ditto.
>+        (WebCore::WebGPUComputeCommandEncoder::setComputePipelineState): Ditto.
>+        (WebCore::WebGPUComputeCommandEncoder::setBuffer): Ditto.
>+        (WebCore::WebGPUComputeCommandEncoder::dispatch): Ditto.
>+        (WebCore::WebGPUComputeCommandEncoder::endEncoding): Ditto.
>+        * html/canvas/WebGPUComputeCommandEncoder.h: Ditto.
>+
>+        * html/canvas/WebGPUComputePipelineState.cpp:
>+        (WebCore::WebGPUComputePipelineState::create): More of the same.
>+        (WebCore::WebGPUComputePipelineState::WebGPUComputePipelineState): Ditto.
>+        * html/canvas/WebGPUComputePipelineState.h: Ditto.
>+
>+        * html/canvas/WebGPUDepthStencilDescriptor.cpp:
>+        (WebCore::WebGPUDepthStencilDescriptor::create): More of the same.
>+        (WebCore::WebGPUDepthStencilDescriptor::depthWriteEnabled const): Ditto.
>+        (WebCore::WebGPUDepthStencilDescriptor::setDepthWriteEnabled): Ditto.
>+        (WebCore::WebGPUDepthStencilDescriptor::depthCompareFunction const): Ditto.
>+        (WebCore::WebGPUDepthStencilDescriptor::setDepthCompareFunction): Ditto.
>+        * html/canvas/WebGPUDepthStencilDescriptor.h: Ditto. Also fixed a bug
>+        where m_depthCompareFunction was uninitialized in newly created objects.
>+
>+        * html/canvas/WebGPUDepthStencilState.cpp:
>+        (WebCore::WebGPUDepthStencilState::create): More of the same.
>+        (WebCore::WebGPUDepthStencilState::WebGPUDepthStencilState): Ditto.
>+        (WebCore::WebGPUDepthStencilState::label const): Ditto.
>+        (WebCore::WebGPUDepthStencilState::setLabel): Ditto.
>+        * html/canvas/WebGPUDepthStencilState.h: Ditto.
>+
>+        * html/canvas/WebGPUDrawable.cpp:
>+        (WebCore::WebGPUDrawable::create): More of the same.
>+        (WebCore::WebGPUDrawable::WebGPUDrawable): Ditto.
>+        * html/canvas/WebGPUDrawable.h: Ditto.
>+
>+        * html/canvas/WebGPUEnums.cpp: Removed some stray const.
>+        * html/canvas/WebGPUEnums.h: Ditto.
>+
>+        * html/canvas/WebGPUFunction.cpp:
>+        (WebCore::WebGPUFunction::create): More of the same.
>+        (WebCore::WebGPUFunction::WebGPUFunction): Ditto.
>+        * html/canvas/WebGPUFunction.h: Ditto.
>+
>+        * html/canvas/WebGPULibrary.cpp:
>+        (WebCore::WebGPULibrary::create): More of the same.
>+        (WebCore::WebGPULibrary::WebGPULibrary): Ditto.
>+        (WebCore::WebGPULibrary::functionNames const): Ditto.
>+        (WebCore::WebGPULibrary::functionWithName const): Ditto.
>+        * html/canvas/WebGPULibrary.h: Ditto.
>+
>+        * html/canvas/WebGPUObject.cpp:
>+        (WebCore::WebGPUObject::WebGPUObject):
>+        (WebCore::WebGPUObject::deleteObject): Deleted this unused function.
>+        We can bring it back later if we find we need it the way we did with the
>+        WebGL implementation, but currently it's a never-called stub. Also
>+        deleted the isDeleted and m_deleted for the same reason.
>+        * html/canvas/WebGPUObject.h: Ditto.
>+
>+        * html/canvas/WebGPURenderCommandEncoder.cpp:
>+        (WebCore::WebGPURenderCommandEncoder::create): More of the same.
>+        (WebCore::WebGPURenderCommandEncoder::WebGPURenderCommandEncoder): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::setRenderPipelineState): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::setDepthStencilState): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::setVertexBuffer): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::setFragmentBuffer): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::drawPrimitives): Ditto.
>+        (WebCore::WebGPURenderCommandEncoder::endEncoding): Ditto.
>+        * html/canvas/WebGPURenderCommandEncoder.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPassAttachmentDescriptor.cpp:
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::WebGPURenderPassAttachmentDescriptor):
>+        More of the same.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::loadAction const): Ditto.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::setLoadAction): Ditto.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::storeAction const): Ditto.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::setStoreAction): Ditto.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::texture const): Ditto.
>+        (WebCore::WebGPURenderPassAttachmentDescriptor::setTexture): Ditto.
>+        * html/canvas/WebGPURenderPassAttachmentDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPassColorAttachmentDescriptor.cpp:
>+        (WebCore::WebGPURenderPassColorAttachmentDescriptor::create): More of the same.
>+        (WebCore::WebGPURenderPassColorAttachmentDescriptor::WebGPURenderPassColorAttachmentDescriptor): Ditto.
>+        (WebCore::WebGPURenderPassColorAttachmentDescriptor::descriptor const): Ditto.
>+        (WebCore::WebGPURenderPassColorAttachmentDescriptor::clearColor const): Ditto.
>+        (WebCore::WebGPURenderPassColorAttachmentDescriptor::setClearColor): Ditto.
>+        * html/canvas/WebGPURenderPassColorAttachmentDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPassDepthAttachmentDescriptor.cpp:
>+        (WebCore::WebGPURenderPassDepthAttachmentDescriptor::create): More of the same.
>+        (WebCore::WebGPURenderPassDepthAttachmentDescriptor::WebGPURenderPassDepthAttachmentDescriptor): Ditto.
>+        (WebCore::WebGPURenderPassDepthAttachmentDescriptor::clearDepth const): Ditto.
>+        (WebCore::WebGPURenderPassDepthAttachmentDescriptor::setClearDepth): Ditto.
>+        (WebCore::WebGPURenderPassDepthAttachmentDescriptor::descriptor const): Ditto.
>+        * html/canvas/WebGPURenderPassDepthAttachmentDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPassDescriptor.cpp:
>+        (WebCore::WebGPURenderPassDescriptor::create): More of the same.
>+        (WebCore::WebGPURenderPassDescriptor::depthAttachment): Ditto.
>+        (WebCore::WebGPURenderPassDescriptor::colorAttachments): Ditto.
>+        * html/canvas/WebGPURenderPassDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.cpp:
>+        (WebCore::WebGPURenderPipelineColorAttachmentDescriptor::create): More of the same.
>+        (WebCore::WebGPURenderPipelineColorAttachmentDescriptor::WebGPURenderPipelineColorAttachmentDescriptor): Ditto.
>+        (WebCore::WebGPURenderPipelineColorAttachmentDescriptor::pixelFormat const): Ditto.
>+        (WebCore::WebGPURenderPipelineColorAttachmentDescriptor::setPixelFormat): Ditto.
>+        * html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPipelineDescriptor.cpp:
>+        (WebCore::WebGPURenderPipelineDescriptor::create): More of the same.
>+        (WebCore::WebGPURenderPipelineDescriptor::vertexFunction const): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::setVertexFunction): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::fragmentFunction const): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::setFragmentFunction): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::colorAttachments): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::depthAttachmentPixelFormat const): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::setDepthAttachmentPixelFormat): Ditto.
>+        (WebCore::WebGPURenderPipelineDescriptor::reset): Ditto.
>+        * html/canvas/WebGPURenderPipelineDescriptor.h: Ditto.
>+
>+        * html/canvas/WebGPURenderPipelineState.cpp:
>+        (WebCore::WebGPURenderPipelineState::create): More of the same.
>+        (WebCore::WebGPURenderPipelineState::WebGPURenderPipelineState): Ditto.
>+        (WebCore::WebGPURenderPipelineState::label const): Ditto.
>+        (WebCore::WebGPURenderPipelineState::setLabel): Ditto.
>+        * html/canvas/WebGPURenderPipelineState.h: Ditto.
>+
>+        * html/canvas/WebGPURenderingContext.cpp:
>+        (WebCore::WebGPURenderingContext::create): More of the same.
>+        (WebCore::WebGPURenderingContext::WebGPURenderingContext): Ditto.
>+        (WebCore::WebGPURenderingContext::initializeNewContext): Ditto.
>+        (WebCore::WebGPURenderingContext::platformLayer const): Ditto.
>+        (WebCore::WebGPURenderingContext::markLayerComposited): Ditto.
>+        (WebCore::WebGPURenderingContext::reshape): Ditto.
>+        (WebCore::WebGPURenderingContext::createLibrary): Ditto.
>+        (WebCore::WebGPURenderingContext::createRenderPipelineState): Ditto.
>+        (WebCore::WebGPURenderingContext::createDepthStencilState): Ditto.
>+        (WebCore::WebGPURenderingContext::createComputePipelineState): Ditto.
>+        (WebCore::WebGPURenderingContext::createCommandQueue): Ditto.
>+        (WebCore::WebGPURenderingContext::nextDrawable): Ditto.
>+        (WebCore::WebGPURenderingContext::createBuffer): Ditto.
>+        (WebCore::WebGPURenderingContext::createTexture): Ditto.
>+        * html/canvas/WebGPURenderingContext.h: Made many functions final and
>+        private.
>+        * html/canvas/WebGPURenderingContext.idl: The return value of most of
>+        the create functions are no longer nullable.
>+
>+        * html/canvas/WebGPUSize.h: Use "unsigned" instead of "unsigned long".
>+
>+        * html/canvas/WebGPUTexture.cpp:
>+        (WebCore::WebGPUTexture::createFromDrawableTexture): More of the same.
>+        (WebCore::WebGPUTexture::create): Ditto.
>+        (WebCore::WebGPUTexture::WebGPUTexture): Ditto.
>+        * html/canvas/WebGPUTexture.h: Ditto.
>+
>+        * html/canvas/WebGPUTextureDescriptor.cpp:
>+        (WebCore::WebGPUTextureDescriptor::create): More of the same.
>+        (WebCore::WebGPUTextureDescriptor::WebGPUTextureDescriptor): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::width const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setWidth): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::height const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setHeight): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::sampleCount const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setSampleCount): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::textureType const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setTextureType): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::storageMode const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setStorageMode): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::usage const): Ditto.
>+        (WebCore::WebGPUTextureDescriptor::setUsage): Ditto.
>+        * html/canvas/WebGPUTextureDescriptor.h: Ditto.
>+
>+        * platform/graphics/metal/GPUBufferMetal.mm: Moved from "cocoa" directory.
>+        (WebCore::GPUBuffer::GPUBuffer): Simplify code using references and the
>+        "metal" naming.
>+
>+        * platform/graphics/metal/GPUCommandBufferMetal.mm:
>+        (WebCore::GPUCommandBuffer::GPUCommandBuffer): Take a function to be called as the
>+        completed handler and set it up.
>+        (WebCore::GPUCommandBuffer::presentDrawable const): Ditto.
>+        (WebCore::GPUCommandBuffer::commit const): Ditto.
>+        (WebCore::GPUCommandBuffer::addCompletedHandler): Deleted.
>+
>+        * platform/graphics/metal/GPUCommandQueueMetal.mm:
>+        (WebCore::GPUCommandQueue::GPUCommandQueue): Ditto. Also rewrote label handling a bit.
>+        (WebCore::GPUCommandQueue::label const): Ditto.
>+        (WebCore::GPUCommandQueue::setLabel const): Ditto.
>+
>+        * platform/graphics/metal/GPUComputeCommandEncoderMetal.mm:
>+        (WebCore::GPUComputeCommandEncoder::GPUComputeCommandEncoder): Ditto.
>+        (WebCore::GPUComputeCommandEncoder::setComputePipelineState const): Ditto.
>+        (WebCore::GPUComputeCommandEncoder::setBuffer const): Ditto.
>+        (WebCore::GPUComputeCommandEncoder::dispatch const): Ditto.
>+        (WebCore::GPUComputeCommandEncoder::endEncoding const): Ditto.
>+
>+        * platform/graphics/metal/GPUComputePipelineStateMetal.mm:
>+        (WebCore::GPUComputePipelineState::GPUComputePipelineState): Ditto.
>+
>+        * platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm:
>+        (WebCore::GPUDepthStencilDescriptor::GPUDepthStencilDescriptor): Ditto.
>+        (WebCore::GPUDepthStencilDescriptor::depthWriteEnabled const): Ditto.
>+        (WebCore::GPUDepthStencilDescriptor::setDepthWriteEnabled const): Ditto.
>+        (WebCore::GPUDepthStencilDescriptor::depthCompareFunction const): Ditto.
>+        (WebCore::GPUDepthStencilDescriptor::setDepthCompareFunction const): Ditto.
>+
>+        * platform/graphics/metal/GPUDepthStencilStateMetal.mm:
>+        (WebCore::GPUDepthStencilState::GPUDepthStencilState): Ditto.
>+        (WebCore::GPUDepthStencilState::label const): Ditto.
>+        (WebCore::GPUDepthStencilState::setLabel const): Ditto. This is one of the
>+        functions that was calling a method that does not exist. Added a comment.
>+
>+        * platform/graphics/metal/GPUDeviceMetal.mm:
>+        (WebCore::GPUDevice::GPUDevice): Ditto. Also fixed two storage leaks where
>+        we neglected to do adoptNS on the result of MTLCreateSystemDefaultDevice and
>+        on the result of -[[WebGPULayer alloc] initWithGPUDevice:].
>+        (WebCore::GPUDevice::reshape const): Ditto.
>+        (WebCore::GPUDevice::platformLayer const): Ditto.
>+        (WebCore::GPUDevice::operator! const): Ditto.
>+
>+        * platform/graphics/metal/GPUDrawableMetal.mm:
>+        (WebCore::GPUDrawable::GPUDrawable): Ditto.
>+        (WebCore::GPUDrawable::release): Ditto.
>+        (WebCore::GPUDrawable::metal const): Ditto.
>+        (WebCore::GPUDrawable::texture const): Ditto.
>+
>+        * platform/graphics/metal/GPUFunctionMetal.mm:
>+        (WebCore::GPUFunction::GPUFunction): Ditto.
>+        (WebCore::GPUFunction::name const): Ditto.
>+        (WebCore::GPUFunction::metal const): Ditto.
>+        (WebCore::GPUFunction::operator! const): Ditto.
>+
>+        * platform/graphics/metal/GPULibraryMetal.mm:
>+        (WebCore::GPULibrary::GPULibrary): Ditto.
>+        (WebCore::GPULibrary::label const): Ditto.
>+        (WebCore::GPULibrary::setLabel const): Ditto.
>+        (WebCore::GPULibrary::functionNames const): Ditto.
>+        (WebCore::GPULibrary::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderCommandEncoderMetal.mm:
>+        (WebCore::GPURenderCommandEncoder::GPURenderCommandEncoder): Ditto.
>+        (WebCore::GPURenderCommandEncoder::setRenderPipelineState const): Ditto.
>+        (WebCore::GPURenderCommandEncoder::setDepthStencilState const): Ditto.
>+        (WebCore::GPURenderCommandEncoder::setVertexBuffer const): Ditto.
>+        (WebCore::GPURenderCommandEncoder::setFragmentBuffer const): Ditto.
>+        (WebCore::GPURenderCommandEncoder::drawPrimitives const): Ditto.
>+        (WebCore::GPURenderCommandEncoder::endEncoding const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm:
>+        (WebCore::GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor): Ditto.
>+        (WebCore::GPURenderPassAttachmentDescriptor::loadAction const): Ditto.
>+        (WebCore::GPURenderPassAttachmentDescriptor::setLoadAction const): Ditto.
>+        (WebCore::GPURenderPassAttachmentDescriptor::storeAction const): Ditto.
>+        (WebCore::GPURenderPassAttachmentDescriptor::setStoreAction const): Ditto.
>+        (WebCore::GPURenderPassAttachmentDescriptor::setTexture const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm:
>+        (WebCore::GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor): Ditto.
>+        (WebCore::GPURenderPassColorAttachmentDescriptor::clearColor const): Ditto.
>+        (WebCore::GPURenderPassColorAttachmentDescriptor::setClearColor const): Ditto.
>+        (WebCore::GPURenderPassColorAttachmentDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm:
>+        (WebCore::GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor): Ditto.
>+        (WebCore::GPURenderPassDepthAttachmentDescriptor::clearDepth const): Ditto.
>+        (WebCore::GPURenderPassDepthAttachmentDescriptor::setClearDepth const): Ditto.
>+        (WebCore::GPURenderPassDepthAttachmentDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPassDescriptorMetal.mm:
>+        (WebCore::GPURenderPassDescriptor::GPURenderPassDescriptor): Ditto.
>+        (WebCore::GPURenderPassDescriptor::colorAttachments const): Ditto.
>+        (WebCore::GPURenderPassDescriptor::depthAttachment const): Ditto.
>+        (WebCore::GPURenderPassDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm:
>+        (WebCore::GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor): Ditto.
>+        (WebCore::GPURenderPipelineColorAttachmentDescriptor::pixelFormat const): Ditto.
>+        (WebCore::GPURenderPipelineColorAttachmentDescriptor::setPixelFormat const): Ditto.
>+        (WebCore::GPURenderPipelineColorAttachmentDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm:
>+        (WebCore::GPURenderPipelineDescriptor::GPURenderPipelineDescriptor): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::depthAttachmentPixelFormat const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::setDepthAttachmentPixelFormat const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::setVertexFunction const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::setFragmentFunction const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::colorAttachments const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::reset const): Ditto.
>+        (WebCore::GPURenderPipelineDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPURenderPipelineStateMetal.mm:
>+        (WebCore::GPURenderPipelineState::GPURenderPipelineState): Ditto.
>+        (WebCore::GPURenderPipelineState::label const): Ditto.
>+        (WebCore::GPURenderPipelineState::setLabel const): Ditto. This is one of the
>+        functions that was calling a method that does not exist. Added a comment.
>+        (WebCore::GPURenderPipelineState::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPUTextureDescriptorMetal.mm:
>+        (WebCore::GPUTextureDescriptor::GPUTextureDescriptor): Ditto.
>+        (WebCore::GPUTextureDescriptor::width const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setWidth const): Ditto.
>+        (WebCore::GPUTextureDescriptor::height const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setHeight const): Ditto.
>+        (WebCore::GPUTextureDescriptor::sampleCount const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setSampleCount const): Ditto.
>+        (WebCore::GPUTextureDescriptor::textureType const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setTextureType const): Ditto.
>+        (WebCore::GPUTextureDescriptor::storageMode const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setStorageMode const): Ditto.
>+        (WebCore::GPUTextureDescriptor::usage const): Ditto.
>+        (WebCore::GPUTextureDescriptor::setUsage const): Ditto.
>+        (WebCore::GPUTextureDescriptor::metal const): Ditto.
>+
>+        * platform/graphics/metal/GPUTextureMetal.mm:
>+        (WebCore::GPUTexture::GPUTexture): Ditto.
>+        (WebCore::GPUTexture::width const): Ditto.
>+        (WebCore::GPUTexture::height const): Ditto.
>+        (WebCore::GPUTexture::metal const): Ditto.
>+
>+        * platform/graphics/gpu/GPUBuffer.cpp: Removed unused stubs.
>+        (WebCore::GPUBuffer::length const): Moved this function here since it has
>+        a useful platform-independent implementation.
>+
>+        * platform/graphics/gpu/GPUBuffer.h: Use OBJC_PROTOCOL for MTLBuffer.
>+        Did the other thigs mentioned above: USE(METAL), remove WEBCORE_EXPORT,
>+        no longer be RefCounted, etc.
>+
>+        * platform/graphics/gpu/GPUCommandBuffer.cpp: Ditto.
>+        * platform/graphics/gpu/GPUCommandBuffer.h: Ditto. Use OBJC_PROTOCOL
>+        for MTLCommandBuffer.
>+
>+        * platform/graphics/gpu/GPUCommandQueue.cpp: Ditto.
>+        * platform/graphics/gpu/GPUCommandQueue.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLCommandQueue.
>+
>+        * platform/graphics/gpu/GPUComputeCommandEncoder.cpp: Ditto.
>+        * platform/graphics/gpu/GPUComputeCommandEncoder.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLComputeCommandEncoder.
>+
>+        * platform/graphics/gpu/GPUComputePipelineState.cpp: Ditto.
>+        * platform/graphics/gpu/GPUComputePipelineState.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLComputePipelineState.
>+
>+        * platform/graphics/gpu/GPUDepthStencilDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPUDepthStencilDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPUDepthStencilState.cpp: Ditto.
>+        * platform/graphics/gpu/GPUDepthStencilState.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLDepthStencilState.
>+
>+        * platform/graphics/gpu/GPUDevice.cpp: Ditto.
>+        * platform/graphics/gpu/GPUDevice.h: Ditto. Use OBJC_PROTOCOL for MTLDevice.
>+
>+        * platform/graphics/gpu/GPUDrawable.cpp: Ditto.
>+        * platform/graphics/gpu/GPUDrawable.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLDrawable and MTLTexture.
>+
>+        * platform/graphics/gpu/GPUEnums.h: Tweaked formatting.
>+
>+        * platform/graphics/gpu/GPUFunction.cpp: Ditto.
>+        * platform/graphics/gpu/GPUFunction.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLFunction.
>+
>+        * platform/graphics/gpu/GPULibrary.cpp: Ditto.
>+        * platform/graphics/gpu/GPULibrary.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLLibrary.
>+
>+        * platform/graphics/gpu/GPURenderCommandEncoder.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderCommandEncoder.h: Ditto.
>+        Use OBJC_PROTOCOL for MTLRenderCommandEncoder.
>+
>+        * platform/graphics/gpu/GPURenderPassAttachmentDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPassAttachmentDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPassDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPassDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPipelineDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPipelineDescriptor.h: Ditto.
>+
>+        * platform/graphics/gpu/GPURenderPipelineState.cpp: Ditto.
>+        * platform/graphics/gpu/GPURenderPipelineState.h: Ditto. Use OBJC_PROTOCOL
>+        for MTLRenderPipelineState.
>+
>+        * platform/graphics/gpu/GPUSize.h: Use "unsigned" instead of "unsigned long".
>+
>+        * platform/graphics/gpu/GPUTexture.cpp: Ditto.
>+        * platform/graphics/gpu/GPUTexture.h: Ditto. Use OBJC_PROTOCOL for
>+        MTLTexture.
>+
>+        * platform/graphics/gpu/GPUTextureDescriptor.cpp: Ditto.
>+        * platform/graphics/gpu/GPUTextureDescriptor.h: Ditto.
>+
> 2018-07-25  Chris Dumez  <cdumez@apple.com>
> 
>         Allow ActiveDOMObject's canSuspend / suspend / resume overrides to destroy ActiveDOMObjects
>diff --git a/Source/WTF/wtf/Compiler.h b/Source/WTF/wtf/Compiler.h
>index 77f271ec315c92517b5bf642066a5a197b38b3ea..798c3090c9b1c18580a3a6be6fab65bdace6ffaa 100644
>--- a/Source/WTF/wtf/Compiler.h
>+++ b/Source/WTF/wtf/Compiler.h
>@@ -296,6 +296,18 @@
> #define OBJC_CLASS class
> #endif
> 
>+/* OBJC_PROTOCOL */
>+
>+#if !defined(OBJC_PROTOCOL) && defined(__OBJC__)
>+/* This forward-declares a protocol, then also creates a type of the same name based on NSObject.
>+ * This allows us to use "NSObject<MyProtocol> *" or "MyProtocol *" more-or-less interchangably. */
>+#define OBJC_PROTOCOL(protocolName) @protocol protocolName; using protocolName = NSObject<protocolName>
>+#endif
>+
>+#if !defined(OBJC_PROTOCOL)
>+#define OBJC_PROTOCOL(protocolName) class protocolName
>+#endif
>+
> /* PURE_FUNCTION */
> 
> #if !defined(PURE_FUNCTION) && COMPILER(GCC_OR_CLANG)
>diff --git a/Source/WTF/wtf/Platform.h b/Source/WTF/wtf/Platform.h
>index 18fa82ff3580b872402143ad0b7c52887fba2816..8397fab5b43d89e358ceb9898fba9ede31af605f 100644
>--- a/Source/WTF/wtf/Platform.h
>+++ b/Source/WTF/wtf/Platform.h
>@@ -1067,6 +1067,8 @@
> #endif
> #endif
> 
>+#define USE_METAL 1
>+
> #if HAVE(ACCESSIBILITY)
> #define USE_ACCESSIBILITY_CONTEXT_MENUS 1
> #endif
>diff --git a/Source/WebCore/PlatformMac.cmake b/Source/WebCore/PlatformMac.cmake
>index 80520ab0fce0df4832f787b45c110a8af38781ba..f3d8d028cfd1e061f9f2c6f302bdf9b95d1d4949 100644
>--- a/Source/WebCore/PlatformMac.cmake
>+++ b/Source/WebCore/PlatformMac.cmake
>@@ -293,27 +293,6 @@ list(APPEND WebCore_SOURCES
>     platform/graphics/cg/TransformationMatrixCG.cpp
>     platform/graphics/cg/UTIRegistry.cpp
> 
>-    platform/graphics/cocoa/GPUBufferMetal.mm
>-    platform/graphics/cocoa/GPUCommandBufferMetal.mm
>-    platform/graphics/cocoa/GPUCommandQueueMetal.mm
>-    platform/graphics/cocoa/GPUComputeCommandEncoderMetal.mm
>-    platform/graphics/cocoa/GPUComputePipelineStateMetal.mm
>-    platform/graphics/cocoa/GPUDepthStencilDescriptorMetal.mm
>-    platform/graphics/cocoa/GPUDepthStencilStateMetal.mm
>-    platform/graphics/cocoa/GPUDeviceMetal.mm
>-    platform/graphics/cocoa/GPUDrawableMetal.mm
>-    platform/graphics/cocoa/GPUFunctionMetal.mm
>-    platform/graphics/cocoa/GPULibraryMetal.mm
>-    platform/graphics/cocoa/GPURenderCommandEncoderMetal.mm
>-    platform/graphics/cocoa/GPURenderPassAttachmentDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPassColorAttachmentDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPassDepthAttachmentDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPassDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPipelineDescriptorMetal.mm
>-    platform/graphics/cocoa/GPURenderPipelineStateMetal.mm
>-    platform/graphics/cocoa/GPUTextureDescriptorMetal.mm
>-    platform/graphics/cocoa/GPUTextureMetal.mm
>     platform/graphics/cocoa/GraphicsContext3DCocoa.mm
>     platform/graphics/cocoa/GraphicsContextCocoa.mm
>     platform/graphics/cocoa/FontCacheCoreText.cpp
>@@ -357,6 +336,28 @@ list(APPEND WebCore_SOURCES
>     platform/graphics/mac/SimpleFontDataCoreText.cpp
>     platform/graphics/mac/WebLayer.mm
> 
>+    platform/graphics/metal/GPUBufferMetal.mm
>+    platform/graphics/metal/GPUCommandBufferMetal.mm
>+    platform/graphics/metal/GPUCommandQueueMetal.mm
>+    platform/graphics/metal/GPUComputeCommandEncoderMetal.mm
>+    platform/graphics/metal/GPUComputePipelineStateMetal.mm
>+    platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm
>+    platform/graphics/metal/GPUDepthStencilStateMetal.mm
>+    platform/graphics/metal/GPUDeviceMetal.mm
>+    platform/graphics/metal/GPUDrawableMetal.mm
>+    platform/graphics/metal/GPUFunctionMetal.mm
>+    platform/graphics/metal/GPULibraryMetal.mm
>+    platform/graphics/metal/GPURenderCommandEncoderMetal.mm
>+    platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPassDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm
>+    platform/graphics/metal/GPURenderPipelineStateMetal.mm
>+    platform/graphics/metal/GPUTextureDescriptorMetal.mm
>+    platform/graphics/metal/GPUTextureMetal.mm
>+
>     platform/graphics/opengl/Extensions3DOpenGL.cpp
>     platform/graphics/opengl/Extensions3DOpenGLCommon.cpp
>     platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
>diff --git a/Source/WebCore/SourcesCocoa.txt b/Source/WebCore/SourcesCocoa.txt
>index f0b8e9448bc0b458857ee9c0329fa35dbe36b431..e352e53b8d61fcb80a2f2a0ca6cefe5c1a91b93d 100644
>--- a/Source/WebCore/SourcesCocoa.txt
>+++ b/Source/WebCore/SourcesCocoa.txt
>@@ -292,27 +292,6 @@ platform/graphics/cg/SubimageCacheWithTimer.cpp
> platform/graphics/cg/TransformationMatrixCG.cpp
> platform/graphics/cg/UTIRegistry.cpp
> 
>-platform/graphics/cocoa/GPUBufferMetal.mm
>-platform/graphics/cocoa/GPUCommandBufferMetal.mm
>-platform/graphics/cocoa/GPUCommandQueueMetal.mm
>-platform/graphics/cocoa/GPUComputeCommandEncoderMetal.mm
>-platform/graphics/cocoa/GPUComputePipelineStateMetal.mm
>-platform/graphics/cocoa/GPUDepthStencilDescriptorMetal.mm
>-platform/graphics/cocoa/GPUDepthStencilStateMetal.mm
>-platform/graphics/cocoa/GPUDeviceMetal.mm
>-platform/graphics/cocoa/GPUDrawableMetal.mm
>-platform/graphics/cocoa/GPUFunctionMetal.mm
>-platform/graphics/cocoa/GPULibraryMetal.mm
>-platform/graphics/cocoa/GPURenderCommandEncoderMetal.mm
>-platform/graphics/cocoa/GPURenderPassAttachmentDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPassColorAttachmentDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPassDepthAttachmentDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPassDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPipelineDescriptorMetal.mm
>-platform/graphics/cocoa/GPURenderPipelineStateMetal.mm
>-platform/graphics/cocoa/GPUTextureDescriptorMetal.mm
>-platform/graphics/cocoa/GPUTextureMetal.mm
> platform/graphics/cocoa/GraphicsContext3DCocoa.mm
> platform/graphics/cocoa/GraphicsContextCocoa.mm
> platform/graphics/cocoa/FontCacheCoreText.cpp
>@@ -360,6 +339,28 @@ platform/graphics/mac/SimpleFontDataCoreText.cpp
> platform/graphics/mac/WebLayer.mm
> platform/graphics/mac/WebKitNSImageExtras.mm
> 
>+platform/graphics/metal/GPUBufferMetal.mm
>+platform/graphics/metal/GPUCommandBufferMetal.mm
>+platform/graphics/metal/GPUCommandQueueMetal.mm
>+platform/graphics/metal/GPUComputeCommandEncoderMetal.mm
>+platform/graphics/metal/GPUComputePipelineStateMetal.mm
>+platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm
>+platform/graphics/metal/GPUDepthStencilStateMetal.mm
>+platform/graphics/metal/GPUDeviceMetal.mm
>+platform/graphics/metal/GPUDrawableMetal.mm
>+platform/graphics/metal/GPUFunctionMetal.mm
>+platform/graphics/metal/GPULibraryMetal.mm
>+platform/graphics/metal/GPURenderCommandEncoderMetal.mm
>+platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPassDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm
>+platform/graphics/metal/GPURenderPipelineStateMetal.mm
>+platform/graphics/metal/GPUTextureDescriptorMetal.mm
>+platform/graphics/metal/GPUTextureMetal.mm
>+
> platform/graphics/opengl/Extensions3DOpenGL.cpp
> platform/graphics/opengl/Extensions3DOpenGLCommon.cpp
> platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
>diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>index 49206e40216931fcd1216a9193716a4bdb4280db..fc1fa1d2ecf8e035d25482fefb759fcfa1eb5561 100644
>--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>@@ -919,22 +919,22 @@
> 		316BDB951E70C89700DE0D5A /* GPUFunction.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDB931E70C89700DE0D5A /* GPUFunction.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		316BDB9B1E70CBBF00DE0D5A /* GPULibrary.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDB991E70CBBF00DE0D5A /* GPULibrary.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		316BDBAA1E71FA9300DE0D5A /* GPUBuffer.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBA81E71FA9300DE0D5A /* GPUBuffer.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBB21E7354BB00DE0D5A /* GPUTexture.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBB01E7354BB00DE0D5A /* GPUTexture.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBB81E7357CB00DE0D5A /* GPUTextureDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBB61E7357CB00DE0D5A /* GPUTextureDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		316BDBB21E7354BB00DE0D5A /* GPUTexture.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBB01E7354BB00DE0D5A /* GPUTexture.h */; };
>+		316BDBB81E7357CB00DE0D5A /* GPUTextureDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBB61E7357CB00DE0D5A /* GPUTextureDescriptor.h */; };
> 		316BDBBC1E73880600DE0D5A /* GPUCommandQueue.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBBA1E73880600DE0D5A /* GPUCommandQueue.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBCD1E75F18400DE0D5A /* GPUDrawable.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBCB1E75F17600DE0D5A /* GPUDrawable.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBCE1E75F18A00DE0D5A /* GPUCommandBuffer.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBC51E75EE2400DE0D5A /* GPUCommandBuffer.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBD31E75F7B600DE0D5A /* GPURenderPassDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBD11E75F7AE00DE0D5A /* GPURenderPassDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBDB1E7612E200DE0D5A /* GPURenderPassColorAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBD91E7612DB00DE0D5A /* GPURenderPassColorAttachmentDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		316BDBCD1E75F18400DE0D5A /* GPUDrawable.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBCB1E75F17600DE0D5A /* GPUDrawable.h */; };
>+		316BDBCE1E75F18A00DE0D5A /* GPUCommandBuffer.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBC51E75EE2400DE0D5A /* GPUCommandBuffer.h */; };
>+		316BDBD31E75F7B600DE0D5A /* GPURenderPassDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBD11E75F7AE00DE0D5A /* GPURenderPassDescriptor.h */; };
>+		316BDBDB1E7612E200DE0D5A /* GPURenderPassColorAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBD91E7612DB00DE0D5A /* GPURenderPassColorAttachmentDescriptor.h */; };
> 		316BDBDF1E76137500DE0D5A /* GPURenderPassAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBDD1E76136C00DE0D5A /* GPURenderPassAttachmentDescriptor.h */; };
>-		316BDBE41E761F0500DE0D5A /* GPURenderPassDepthAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBE31E761EFF00DE0D5A /* GPURenderPassDepthAttachmentDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBEB1E76244D00DE0D5A /* GPURenderCommandEncoder.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBE91E76244400DE0D5A /* GPURenderCommandEncoder.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBF01E76292000DE0D5A /* GPUDepthStencilState.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBEF1E76291B00DE0D5A /* GPUDepthStencilState.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBF71E762AD500DE0D5A /* GPUDepthStencilDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBF51E762ACD00DE0D5A /* GPUDepthStencilDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDBFB1E762D0400DE0D5A /* GPUEnums.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFA1E762D0400DE0D5A /* GPUEnums.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDC021E762F6400DE0D5A /* GPURenderPipelineDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFD1E762F5700DE0D5A /* GPURenderPipelineDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDC031E762F6900DE0D5A /* GPURenderPipelineState.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFF1E762F5700DE0D5A /* GPURenderPipelineState.h */; settings = {ATTRIBUTES = (Private, ); }; };
>-		316BDC0D1E7634D200DE0D5A /* GPURenderPipelineColorAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDC091E76342700DE0D5A /* GPURenderPipelineColorAttachmentDescriptor.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		316BDBE41E761F0500DE0D5A /* GPURenderPassDepthAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBE31E761EFF00DE0D5A /* GPURenderPassDepthAttachmentDescriptor.h */; };
>+		316BDBEB1E76244D00DE0D5A /* GPURenderCommandEncoder.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBE91E76244400DE0D5A /* GPURenderCommandEncoder.h */; };
>+		316BDBF01E76292000DE0D5A /* GPUDepthStencilState.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBEF1E76291B00DE0D5A /* GPUDepthStencilState.h */; };
>+		316BDBF71E762AD500DE0D5A /* GPUDepthStencilDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBF51E762ACD00DE0D5A /* GPUDepthStencilDescriptor.h */; };
>+		316BDBFB1E762D0400DE0D5A /* GPUEnums.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFA1E762D0400DE0D5A /* GPUEnums.h */; };
>+		316BDC021E762F6400DE0D5A /* GPURenderPipelineDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFD1E762F5700DE0D5A /* GPURenderPipelineDescriptor.h */; };
>+		316BDC031E762F6900DE0D5A /* GPURenderPipelineState.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDBFF1E762F5700DE0D5A /* GPURenderPipelineState.h */; };
>+		316BDC0D1E7634D200DE0D5A /* GPURenderPipelineColorAttachmentDescriptor.h in Headers */ = {isa = PBXBuildFile; fileRef = 316BDC091E76342700DE0D5A /* GPURenderPipelineColorAttachmentDescriptor.h */; };
> 		316DCB201E78CA55001B5F87 /* JSRTCOfferAnswerOptions.h in Headers */ = {isa = PBXBuildFile; fileRef = 316DCB1A1E78CA55001B5F87 /* JSRTCOfferAnswerOptions.h */; };
> 		316DCB221E78CA55001B5F87 /* JSRTCRtpTransceiverDirection.h in Headers */ = {isa = PBXBuildFile; fileRef = 316DCB1C1E78CA55001B5F87 /* JSRTCRtpTransceiverDirection.h */; };
> 		316DCB4C1E7910A6001B5F87 /* JSRTCIceConnectionState.h in Headers */ = {isa = PBXBuildFile; fileRef = 316DCB461E7910A6001B5F87 /* JSRTCIceConnectionState.h */; };
>@@ -2597,6 +2597,9 @@
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>@@ -13293,10 +13295,10 @@
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> 		CD94A5DB1F71CBB000F525C5 /* CDMClearKey.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CDMClearKey.cpp; sourceTree = "<group>"; };
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>+		CD9D82731C7AE535006FF066 /* TextureCacheCV.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = TextureCacheCV.mm; sourceTree = "<group>"; };
>+		CD9D82741C7AE535006FF066 /* TextureCacheCV.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TextureCacheCV.h; sourceTree = "<group>"; };
>+		CD9D82771C7B8EE1006FF066 /* VideoTextureCopierCV.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = VideoTextureCopierCV.cpp; sourceTree = "<group>"; };
>+		CD9D82781C7B8EE1006FF066 /* VideoTextureCopierCV.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VideoTextureCopierCV.h; sourceTree = "<group>"; };
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>@@ -15711,7 +15713,7 @@
> 				0FE5FBD01C3DD51E0007A2CA /* DisplayListReplayer.cpp */,
> 				0FE5FBD11C3DD51E0007A2CA /* DisplayListReplayer.h */,
> 			);
>-			name = displaylists;
>+			path = displaylists;
> 			sourceTree = "<group>";
> 		};
> 		115CFA66208AF720001E6991 /* layout */ = {
>@@ -20352,6 +20354,34 @@
> 			path = filters;
> 			sourceTree = "<group>";
> 		};
>+		9368C49120F9B57200434D61 /* metal */ = {
>+			isa = PBXGroup;
>+			children = (
>+				316BDBA51E71FA6F00DE0D5A /* GPUBufferMetal.mm */,
>+				316BDBC61E75EE3D00DE0D5A /* GPUCommandBufferMetal.mm */,
>+				316BDBBD1E73881300DE0D5A /* GPUCommandQueueMetal.mm */,
>+				381E35E91E8E20AC0043E850 /* GPUComputeCommandEncoderMetal.mm */,
>+				381E35EE1E8E24CB0043E850 /* GPUComputePipelineStateMetal.mm */,
>+				316BDBF81E762BEF00DE0D5A /* GPUDepthStencilDescriptorMetal.mm */,
>+				316BDBF21E76293700DE0D5A /* GPUDepthStencilStateMetal.mm */,
>+				316BDB881E6E141C00DE0D5A /* GPUDeviceMetal.mm */,
>+				316BDBC91E75F16200DE0D5A /* GPUDrawableMetal.mm */,
>+				316BDB961E70CA2400DE0D5A /* GPUFunctionMetal.mm */,
>+				316BDB9C1E70CD9000DE0D5A /* GPULibraryMetal.mm */,
>+				316BDBEC1E76246B00DE0D5A /* GPURenderCommandEncoderMetal.mm */,
>+				316BDBE01E761CB500DE0D5A /* GPURenderPassAttachmentDescriptorMetal.mm */,
>+				316BDBD61E7612C400DE0D5A /* GPURenderPassColorAttachmentDescriptorMetal.mm */,
>+				316BDBE61E761F2700DE0D5A /* GPURenderPassDepthAttachmentDescriptorMetal.mm */,
>+				316BDBD41E75F7CA00DE0D5A /* GPURenderPassDescriptorMetal.mm */,
>+				316BDC0A1E76343600DE0D5A /* GPURenderPipelineColorAttachmentDescriptorMetal.mm */,
>+				316BDC041E762F7E00DE0D5A /* GPURenderPipelineDescriptorMetal.mm */,
>+				316BDC051E762F7E00DE0D5A /* GPURenderPipelineStateMetal.mm */,
>+				316BDBB31E7357B000DE0D5A /* GPUTextureDescriptorMetal.mm */,
>+				316BDBAD1E73549C00DE0D5A /* GPUTextureMetal.mm */,
>+			);
>+			path = metal;
>+			sourceTree = "<group>";
>+		};
> 		93A1EAA20A5634D8006960A0 /* mac */ = {
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>@@ -23554,6 +23584,7 @@
> 				441AF0A70EBA7BBF0044ED4B /* ios */,
> 				CD892F5A1FB52ACF009333D2 /* iso */,
> 				B27535490B053814002CE64F /* mac */,
>+				9368C49120F9B57200434D61 /* metal */,
> 				FBC220DD1237FBEB00BCF788 /* opengl */,
> 				3721493318F0B6D600156EDC /* opentype */,
> 				49E911B20EF86D27009D0CAF /* transforms */,
>@@ -23620,7 +23651,6 @@
> 				371F4FFA0D25E7F300ECE0D5 /* FontRanges.h */,
> 				C2AB0AF41E6B3C6C001348C5 /* FontSelectionAlgorithm.cpp */,
> 				C2AB0AF51E6B3C6C001348C5 /* FontSelectionAlgorithm.h */,
>-				C2AB0B021E6DE32B001348C5 /* FontSelectionKeywordValues.h */,
> 				B2C3DA5A0D006CD600EF6F26 /* FontSelector.h */,
> 				E419041E1CC6486B00C35F5D /* FontSelectorClient.h */,
> 				4A6E9FC513C17D570046A7F8 /* FontTaggedSettings.cpp */,
>@@ -23867,27 +23897,6 @@
> 				1C12AC281EE778AE0079E0A0 /* FontFamilySpecificationCoreText.cpp */,
> 				1C12AC291EE778AE0079E0A0 /* FontFamilySpecificationCoreText.h */,
> 				B5320D6A122A24E9002D1440 /* FontPlatformDataCocoa.mm */,
>-				316BDBA51E71FA6F00DE0D5A /* GPUBufferMetal.mm */,
>-				316BDBC61E75EE3D00DE0D5A /* GPUCommandBufferMetal.mm */,
>-				316BDBBD1E73881300DE0D5A /* GPUCommandQueueMetal.mm */,
>-				381E35E91E8E20AC0043E850 /* GPUComputeCommandEncoderMetal.mm */,
>-				381E35EE1E8E24CB0043E850 /* GPUComputePipelineStateMetal.mm */,
>-				316BDBF81E762BEF00DE0D5A /* GPUDepthStencilDescriptorMetal.mm */,
>-				316BDBF21E76293700DE0D5A /* GPUDepthStencilStateMetal.mm */,
>-				316BDB881E6E141C00DE0D5A /* GPUDeviceMetal.mm */,
>-				316BDBC91E75F16200DE0D5A /* GPUDrawableMetal.mm */,
>-				316BDB961E70CA2400DE0D5A /* GPUFunctionMetal.mm */,
>-				316BDB9C1E70CD9000DE0D5A /* GPULibraryMetal.mm */,
>-				316BDBEC1E76246B00DE0D5A /* GPURenderCommandEncoderMetal.mm */,
>-				316BDBE01E761CB500DE0D5A /* GPURenderPassAttachmentDescriptorMetal.mm */,
>-				316BDBD61E7612C400DE0D5A /* GPURenderPassColorAttachmentDescriptorMetal.mm */,
>-				316BDBE61E761F2700DE0D5A /* GPURenderPassDepthAttachmentDescriptorMetal.mm */,
>-				316BDBD41E75F7CA00DE0D5A /* GPURenderPassDescriptorMetal.mm */,
>-				316BDC0A1E76343600DE0D5A /* GPURenderPipelineColorAttachmentDescriptorMetal.mm */,
>-				316BDC041E762F7E00DE0D5A /* GPURenderPipelineDescriptorMetal.mm */,
>-				316BDC051E762F7E00DE0D5A /* GPURenderPipelineStateMetal.mm */,
>-				316BDBB31E7357B000DE0D5A /* GPUTextureDescriptorMetal.mm */,
>-				316BDBAD1E73549C00DE0D5A /* GPUTextureMetal.mm */,
> 				49FFBF1C11C8550E006A7118 /* GraphicsContext3DCocoa.mm */,
> 				B277B4030B22F37C0004BEC6 /* GraphicsContextCocoa.mm */,
> 				2D0B4AA918DA1CCD00434DE1 /* IOSurface.h */,
>@@ -24686,8 +24695,7 @@
> 				CD871C691FB52B6900F0B965 /* ISOVTTCue.cpp */,
> 				CD871C651FB52B6700F0B965 /* ISOVTTCue.h */,
> 			);
>-			name = iso;
>-			path = "New Group";
>+			path = iso;
> 			sourceTree = "<group>";
> 		};
> 		CD94A5CB1F71CB4600F525C5 /* encryptedmedia */ = {
>@@ -24742,8 +24750,7 @@
> 				CD9D82771C7B8EE1006FF066 /* VideoTextureCopierCV.cpp */,
> 				CD9D82781C7B8EE1006FF066 /* VideoTextureCopierCV.h */,
> 			);
>-			name = cv;
>-			path = cg;
>+			path = cv;
> 			sourceTree = "<group>";
> 		};
> 		CDA98DBD16014E0800FEA3B1 /* encryptedmedia */ = {
>@@ -28057,6 +28064,8 @@
> 				316BDBAA1E71FA9300DE0D5A /* GPUBuffer.h in Headers */,
> 				316BDBCE1E75F18A00DE0D5A /* GPUCommandBuffer.h in Headers */,
> 				316BDBBC1E73880600DE0D5A /* GPUCommandQueue.h in Headers */,
>+				93A953B420EBD43200A619F6 /* GPUComputeCommandEncoder.h in Headers */,
>+				93A953B020EBD3C900A619F6 /* GPUComputePipelineState.h in Headers */,
> 				316BDBF71E762AD500DE0D5A /* GPUDepthStencilDescriptor.h in Headers */,
> 				316BDBF01E76292000DE0D5A /* GPUDepthStencilState.h in Headers */,
> 				316BDB861E6E0A2700DE0D5A /* GPUDevice.h in Headers */,
>@@ -28072,6 +28081,7 @@
> 				316BDC0D1E7634D200DE0D5A /* GPURenderPipelineColorAttachmentDescriptor.h in Headers */,
> 				316BDC021E762F6400DE0D5A /* GPURenderPipelineDescriptor.h in Headers */,
> 				316BDC031E762F6900DE0D5A /* GPURenderPipelineState.h in Headers */,
>+				93A953B520EC9C3F00A619F6 /* GPUSize.h in Headers */,
> 				316BDBB21E7354BB00DE0D5A /* GPUTexture.h in Headers */,
> 				316BDBB81E7357CB00DE0D5A /* GPUTextureDescriptor.h in Headers */,
> 				BC53C5F50DA56B920021EB5D /* Gradient.h in Headers */,
>diff --git a/Source/WebCore/bindings/js/JSWebGPURenderPassAttachmentDescriptorCustom.cpp b/Source/WebCore/bindings/js/JSWebGPURenderPassAttachmentDescriptorCustom.cpp
>index 965b3ec452dfdc613c13e8d10af0451f21fa474f..7af643649054c3246879e847de32812d3c25eca1 100644
>--- a/Source/WebCore/bindings/js/JSWebGPURenderPassAttachmentDescriptorCustom.cpp
>+++ b/Source/WebCore/bindings/js/JSWebGPURenderPassAttachmentDescriptorCustom.cpp
>@@ -30,17 +30,17 @@
> 
> #include "JSDOMBinding.h"
> #include "JSWebGPURenderPassColorAttachmentDescriptor.h"
>+#include "JSWebGPURenderPassDepthAttachmentDescriptor.h"
> #include "WebGPURenderPassColorAttachmentDescriptor.h"
>-
>+#include "WebGPURenderPassDepthAttachmentDescriptor.h"
> 
> namespace WebCore {
>-using namespace JSC;
> 
> JSC::JSValue toJSNewlyCreated(JSC::ExecState*, JSDOMGlobalObject* globalObject, Ref<WebGPURenderPassAttachmentDescriptor>&& object)
> {
>     if (object->isColorAttachmentDescriptor())
>         return createWrapper<WebGPURenderPassColorAttachmentDescriptor>(globalObject, WTFMove(object));
>-    return createWrapper<WebGPURenderPassAttachmentDescriptor>(globalObject, WTFMove(object));
>+    return createWrapper<WebGPURenderPassDepthAttachmentDescriptor>(globalObject, WTFMove(object));
> }
> 
> JSValue toJS(ExecState* state, JSDOMGlobalObject* globalObject, WebGPURenderPassAttachmentDescriptor& object)
>diff --git a/Source/WebCore/html/canvas/WebGPUBuffer.cpp b/Source/WebCore/html/canvas/WebGPUBuffer.cpp
>index 536f556db223ea5b6d9716957cc532e198350d86..75f9765e6c0dacacd3d163a28334be04349c0cd3 100644
>--- a/Source/WebCore/html/canvas/WebGPUBuffer.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUBuffer.cpp
>@@ -28,39 +28,20 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUBuffer.h"
> #include "WebGPURenderingContext.h"
>-#include <JavaScriptCore/ArrayBuffer.h>
> 
> namespace WebCore {
> 
>-Ref<WebGPUBuffer> WebGPUBuffer::create(WebGPURenderingContext* context, ArrayBufferView* data)
>+RefPtr<WebGPUBuffer> WebGPUBuffer::create(WebGPURenderingContext& context, const JSC::ArrayBufferView& data)
> {
>+    // FIXME: Consider returning null rather than a buffer with length 0 and contents null when creation fails.
>     return adoptRef(*new WebGPUBuffer(context, data));
> }
> 
>-WebGPUBuffer::WebGPUBuffer(WebGPURenderingContext* context, ArrayBufferView* data)
>-    : WebGPUObject(context)
>+WebGPUBuffer::WebGPUBuffer(WebGPURenderingContext& context, const JSC::ArrayBufferView& data)
>+    : WebGPUObject { &context }
>+    , m_buffer { context.device(), data }
> {
>-    m_buffer = context->device()->createBufferFromData(data);
>-}
>-
>-WebGPUBuffer::~WebGPUBuffer() = default;
>-
>-unsigned long WebGPUBuffer::length() const
>-{
>-    if (!m_buffer)
>-        return 0;
>-
>-    return m_buffer->length();
>-}
>-
>-RefPtr<ArrayBuffer> WebGPUBuffer::contents() const
>-{
>-    if (!m_buffer)
>-        return nullptr;
>-
>-    return m_buffer->contents();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUBuffer.h b/Source/WebCore/html/canvas/WebGPUBuffer.h
>index 68bcd305816f12a26e50b793ee394e09fb7df577..ae59391b67f356e6992ee1bd0ce9a2e1ae08436f 100644
>--- a/Source/WebCore/html/canvas/WebGPUBuffer.h
>+++ b/Source/WebCore/html/canvas/WebGPUBuffer.h
>@@ -27,25 +27,24 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUBuffer.h"
> #include "WebGPUObject.h"
> 
> namespace WebCore {
> 
>-class GPUBuffer;
>-
> class WebGPUBuffer : public WebGPUObject {
> public:
>-    virtual ~WebGPUBuffer();
>-    static Ref<WebGPUBuffer> create(WebGPURenderingContext*, ArrayBufferView*);
>+    static RefPtr<WebGPUBuffer> create(WebGPURenderingContext&, const JSC::ArrayBufferView&);
> 
>-    unsigned long length() const;
>-    RefPtr<ArrayBuffer> contents() const;
>+    unsigned length() const { return m_buffer.length(); }
>+    JSC::ArrayBuffer& contents() const { return *m_buffer.contents(); }
> 
>-    GPUBuffer* buffer() { return m_buffer.get(); }
>+    const GPUBuffer& buffer() const { return m_buffer; }
> 
> private:
>-    WebGPUBuffer(WebGPURenderingContext*, ArrayBufferView*);
>-    RefPtr<GPUBuffer> m_buffer;
>+    WebGPUBuffer(WebGPURenderingContext&, const JSC::ArrayBufferView&);
>+
>+    GPUBuffer m_buffer;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUCommandBuffer.cpp b/Source/WebCore/html/canvas/WebGPUCommandBuffer.cpp
>index 8e4ddbc1b8a793e1289ca863e5a4cde80ccb9e54..47bf01025b0171a015146c1cf00517b6baa59257 100644
>--- a/Source/WebCore/html/canvas/WebGPUCommandBuffer.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUCommandBuffer.cpp
>@@ -32,7 +32,6 @@
> #include "GPUCommandBuffer.h"
> #include "GPUCommandQueue.h"
> #include "Logging.h"
>-#include "WebGPUCommandQueue.h"
> #include "WebGPUComputeCommandEncoder.h"
> #include "WebGPUDrawable.h"
> #include "WebGPURenderCommandEncoder.h"
>@@ -41,16 +40,16 @@
> 
> namespace WebCore {
> 
>-Ref<WebGPUCommandBuffer> WebGPUCommandBuffer::create(WebGPURenderingContext* context, WebGPUCommandQueue* queue)
>+Ref<WebGPUCommandBuffer> WebGPUCommandBuffer::create(WebGPURenderingContext& context, const GPUCommandQueue& queue)
> {
>     return adoptRef(*new WebGPUCommandBuffer(context, queue));
> }
> 
>-WebGPUCommandBuffer::WebGPUCommandBuffer(WebGPURenderingContext* context, WebGPUCommandQueue* queue)
>-    : WebGPUObject(context)
>+WebGPUCommandBuffer::WebGPUCommandBuffer(WebGPURenderingContext& context, const GPUCommandQueue& queue)
>+    : WebGPUObject { &context }
>+    , m_buffer { queue, [this] () { m_completed.resolve(); } }
> {
>     LOG(WebGPU, "WebGPUCommandBuffer::WebGPUCommandBuffer()");
>-    m_commandBuffer = queue->commandQueue()->createCommandBuffer();
> }
> 
> WebGPUCommandBuffer::~WebGPUCommandBuffer()
>@@ -61,36 +60,28 @@ WebGPUCommandBuffer::~WebGPUCommandBuffer()
> void WebGPUCommandBuffer::commit()
> {
>     LOG(WebGPU, "WebGPUCommandBuffer::commit()");
>-    if (!m_commandBuffer)
>-        return;
>-
>-    return m_commandBuffer->commit();
>+    m_buffer.commit();
> }
> 
> void WebGPUCommandBuffer::presentDrawable(WebGPUDrawable& drawable)
> {
>     LOG(WebGPU, "WebGPUCommandBuffer::presentDrawable()");
>-    if (!m_commandBuffer)
>-        return;
>-
>-    return m_commandBuffer->presentDrawable(drawable.drawable());
>+    m_buffer.presentDrawable(drawable.drawable());
> }
> 
>-RefPtr<WebGPURenderCommandEncoder> WebGPUCommandBuffer::createRenderCommandEncoderWithDescriptor(WebGPURenderPassDescriptor& descriptor)
>+Ref<WebGPURenderCommandEncoder> WebGPUCommandBuffer::createRenderCommandEncoderWithDescriptor(WebGPURenderPassDescriptor& descriptor)
> {
>-    RefPtr<WebGPURenderCommandEncoder> commandEncoder = WebGPURenderCommandEncoder::create(this->context(), this, &descriptor);
>-    return commandEncoder;
>+    return WebGPURenderCommandEncoder::create(*context(), m_buffer, descriptor.descriptor());
> }
> 
>-RefPtr<WebGPUComputeCommandEncoder> WebGPUCommandBuffer::createComputeCommandEncoder()
>+Ref<WebGPUComputeCommandEncoder> WebGPUCommandBuffer::createComputeCommandEncoder()
> {
>-    RefPtr<WebGPUComputeCommandEncoder> commandEncoder = WebGPUComputeCommandEncoder::create(this->context(), this);
>-    return commandEncoder;
>+    return WebGPUComputeCommandEncoder::create(*context(), m_buffer);
> }
> 
> DOMPromiseProxy<IDLVoid>& WebGPUCommandBuffer::completed()
> {
>-    return m_commandBuffer->completed();
>+    return m_completed;
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUCommandBuffer.h b/Source/WebCore/html/canvas/WebGPUCommandBuffer.h
>index e8725db03419b4e832aabd31625e038216b020e1..0187614eaafeb7d7181779409260b3eba981e15f 100644
>--- a/Source/WebCore/html/canvas/WebGPUCommandBuffer.h
>+++ b/Source/WebCore/html/canvas/WebGPUCommandBuffer.h
>@@ -28,39 +28,37 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUCommandBuffer.h"
> #include "DOMPromiseProxy.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUCommandBuffer;
>-class WebGPUCommandQueue;
>+class WebGPUComputeCommandEncoder;
> class WebGPUDrawable;
>-class WebGPUFunction;
> class WebGPURenderCommandEncoder;
> class WebGPURenderPassDescriptor;
>-class WebGPUComputeCommandEncoder;
> 
> class WebGPUCommandBuffer : public WebGPUObject {
> public:
>     virtual ~WebGPUCommandBuffer();
>-    static Ref<WebGPUCommandBuffer> create(WebGPURenderingContext*, WebGPUCommandQueue*);
>+    static Ref<WebGPUCommandBuffer> create(WebGPURenderingContext&, const GPUCommandQueue&);
> 
>     void commit();
>     void presentDrawable(WebGPUDrawable&);
> 
>-    RefPtr<WebGPURenderCommandEncoder> createRenderCommandEncoderWithDescriptor(WebGPURenderPassDescriptor&);
>-    RefPtr<WebGPUComputeCommandEncoder> createComputeCommandEncoder();
>-
>-    GPUCommandBuffer* commandBuffer() { return m_commandBuffer.get(); }
>+    Ref<WebGPURenderCommandEncoder> createRenderCommandEncoderWithDescriptor(WebGPURenderPassDescriptor&);
>+    Ref<WebGPUComputeCommandEncoder> createComputeCommandEncoder();
> 
>     DOMPromiseProxy<IDLVoid>& completed();
> 
>+    const GPUCommandBuffer& buffer() const { return m_buffer; }
>+
> private:
>-    WebGPUCommandBuffer(WebGPURenderingContext*, WebGPUCommandQueue*);
>-    RefPtr<GPUCommandBuffer> m_commandBuffer;
>+    WebGPUCommandBuffer(WebGPURenderingContext&, const GPUCommandQueue&);
>+
>+    GPUCommandBuffer m_buffer;
>+    DOMPromiseProxy<IDLVoid> m_completed;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUCommandQueue.cpp b/Source/WebCore/html/canvas/WebGPUCommandQueue.cpp
>index 5fdd9dfaa60c995d16b765d92cd5979af23d371f..ca6fdb22a19f9c5a4727a2ad04ba2b44e475bb34 100644
>--- a/Source/WebCore/html/canvas/WebGPUCommandQueue.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUCommandQueue.cpp
>@@ -28,45 +28,27 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUCommandQueue.h"
> #include "WebGPUCommandBuffer.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPUCommandQueue> WebGPUCommandQueue::create(WebGPURenderingContext* context)
>+Ref<WebGPUCommandQueue> WebGPUCommandQueue::create(WebGPURenderingContext& context)
> {
>     return adoptRef(*new WebGPUCommandQueue(context));
> }
> 
>-WebGPUCommandQueue::WebGPUCommandQueue(WebGPURenderingContext* context)
>-    : WebGPUObject(context)
>+WebGPUCommandQueue::WebGPUCommandQueue(WebGPURenderingContext& context)
>+    : WebGPUObject { &context }
>+    , m_queue { context.device() }
> {
>-    m_commandQueue = context->device()->createCommandQueue();
> }
> 
> WebGPUCommandQueue::~WebGPUCommandQueue() = default;
> 
>-String WebGPUCommandQueue::label() const
>+Ref<WebGPUCommandBuffer> WebGPUCommandQueue::createCommandBuffer()
> {
>-    if (!m_commandQueue)
>-        return emptyString();
>-
>-    return m_commandQueue->label();
>-}
>-
>-void WebGPUCommandQueue::setLabel(const String& label)
>-{
>-    if (!m_commandQueue)
>-        return;
>-
>-    m_commandQueue->setLabel(label);
>-}
>-
>-RefPtr<WebGPUCommandBuffer> WebGPUCommandQueue::createCommandBuffer()
>-{
>-    RefPtr<WebGPUCommandBuffer> buffer = WebGPUCommandBuffer::create(this->context(), this);
>-    return buffer;
>+    return WebGPUCommandBuffer::create(*context(), m_queue);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUCommandQueue.h b/Source/WebCore/html/canvas/WebGPUCommandQueue.h
>index b93b93c06d880a929ba483d743e566ae5b6974c9..a78fb96cf2306bd97014e0269eb976450c790128 100644
>--- a/Source/WebCore/html/canvas/WebGPUCommandQueue.h
>+++ b/Source/WebCore/html/canvas/WebGPUCommandQueue.h
>@@ -27,32 +27,27 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUCommandQueue.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUCommandBuffer;
>-class GPUCommandQueue;
> class WebGPUCommandBuffer;
> 
> class WebGPUCommandQueue : public WebGPUObject {
> public:
>     virtual ~WebGPUCommandQueue();
>-    static Ref<WebGPUCommandQueue> create(WebGPURenderingContext*);
>-
>-    String label() const;
>-    void setLabel(const String&);
>+    static Ref<WebGPUCommandQueue> create(WebGPURenderingContext&);
> 
>-    RefPtr<WebGPUCommandBuffer> createCommandBuffer();
>+    String label() const { return m_queue.label(); }
>+    void setLabel(const String& label) { m_queue.setLabel(label); }
> 
>-    GPUCommandQueue* commandQueue() { return m_commandQueue.get(); }
>+    Ref<WebGPUCommandBuffer> createCommandBuffer();
> 
> private:
>-    WebGPUCommandQueue(WebGPURenderingContext*);
>+    explicit WebGPUCommandQueue(WebGPURenderingContext&);
> 
>-    RefPtr<GPUCommandQueue> m_commandQueue;
>+    GPUCommandQueue m_queue;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUCommandQueue.idl b/Source/WebCore/html/canvas/WebGPUCommandQueue.idl
>index c1689b766586eecc4c0624614c8f047e927d18d0..d63cbef6256bb461c7f2e092d3ad5f01d1948787 100644
>--- a/Source/WebCore/html/canvas/WebGPUCommandQueue.idl
>+++ b/Source/WebCore/html/canvas/WebGPUCommandQueue.idl
>@@ -30,6 +30,6 @@
> 
>     attribute DOMString label;
> 
>-    WebGPUCommandBuffer? createCommandBuffer();
>+    WebGPUCommandBuffer createCommandBuffer();
> 
> };
>diff --git a/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.cpp b/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.cpp
>index 3d55ee57c14253d988fafc08a261b3584f6f8dac..297b4cc0ff6ac2f6452d775cb997aa0c57f0a8d4 100644
>--- a/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.cpp
>@@ -37,53 +37,43 @@
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
>-    
>-inline GPUSize GPUSizeMake(WebGPUSize size)
>+
>+static inline GPUSize GPUSizeMake(WebGPUSize size)
> {
>-    return {size.width, size.height, size.depth};
>+    return { size.width, size.height, size.depth };
> }
> 
>-Ref<WebGPUComputeCommandEncoder> WebGPUComputeCommandEncoder::create(WebGPURenderingContext* context, WebGPUCommandBuffer* buffer)
>+Ref<WebGPUComputeCommandEncoder> WebGPUComputeCommandEncoder::create(WebGPURenderingContext& context, const GPUCommandBuffer& buffer)
> {
>     return adoptRef(*new WebGPUComputeCommandEncoder(context, buffer));
> }
>     
>-WebGPUComputeCommandEncoder::WebGPUComputeCommandEncoder(WebGPURenderingContext* context, WebGPUCommandBuffer* buffer)
>-    : WebGPUObject(context)
>+WebGPUComputeCommandEncoder::WebGPUComputeCommandEncoder(WebGPURenderingContext& context, const GPUCommandBuffer& buffer)
>+    : WebGPUObject { &context }
>+    , m_encoder { buffer }
> {
>-    m_computeCommandEncoder = buffer->commandBuffer()->createComputeCommandEncoder();
> }
>-    
>-WebGPUComputeCommandEncoder::~WebGPUComputeCommandEncoder() = default;
>-    
>+
> void WebGPUComputeCommandEncoder::setComputePipelineState(WebGPUComputePipelineState& pipelineState)
> {
>-    if (!m_computeCommandEncoder)
>-        return;
>-    m_computeCommandEncoder->setComputePipelineState(pipelineState.computePipelineState());
>+    m_encoder.setComputePipelineState(pipelineState.state());
> }
>-    
>+
> void WebGPUComputeCommandEncoder::setBuffer(WebGPUBuffer& buffer, unsigned offset, unsigned index)
> {
>-    if (!m_computeCommandEncoder)
>-        return;
>-    m_computeCommandEncoder->setBuffer(buffer.buffer(), offset, index);
>+    m_encoder.setBuffer(buffer.buffer(), offset, index);
> }
>-    
>+
> void WebGPUComputeCommandEncoder::dispatch(WebGPUSize threadgroupsPerGrid, WebGPUSize threadsPerThreadgroup)
> {
>-    if (!m_computeCommandEncoder)
>-        return;
>-    m_computeCommandEncoder->dispatch(GPUSizeMake(threadgroupsPerGrid), GPUSizeMake(threadsPerThreadgroup));
>+    m_encoder.dispatch(GPUSizeMake(threadgroupsPerGrid), GPUSizeMake(threadsPerThreadgroup));
> }
>-    
>+
> void WebGPUComputeCommandEncoder::endEncoding()
> {
>-    if (!m_computeCommandEncoder)
>-        return;
>-    m_computeCommandEncoder->endEncoding();
>+    m_encoder.endEncoding();
> }
>-    
>+
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.h b/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.h
>index 2f37e26eda0e821bf84a3ef766c4328d1595b397..6a0c1b7d31c9dd53d4a8ca1b3c4425793208225a 100644
>--- a/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.h
>+++ b/Source/WebCore/html/canvas/WebGPUComputeCommandEncoder.h
>@@ -25,38 +25,30 @@
> 
> #pragma once
> 
>-#include "WebGPUSize.h"
>-
> #if ENABLE(WEBGPU)
> 
>+#include "GPUComputeCommandEncoder.h"
> #include "WebGPUObject.h"
>-
>-#include <wtf/Vector.h>
>+#include "WebGPUSize.h"
> 
> namespace WebCore {
> 
>-class GPUComputeCommandEncoder;
> class WebGPUBuffer;
>-class WebGPUCommandBuffer;
> class WebGPUComputePipelineState;
>-class WebGPURenderingContext;
> 
> class WebGPUComputeCommandEncoder : public WebGPUObject {
>-
> public:
>-    virtual ~WebGPUComputeCommandEncoder();
>-    static Ref<WebGPUComputeCommandEncoder> create(WebGPURenderingContext*, WebGPUCommandBuffer*);
>+    static Ref<WebGPUComputeCommandEncoder> create(WebGPURenderingContext&, const GPUCommandBuffer&);
> 
>     void setComputePipelineState(WebGPUComputePipelineState&);
>     void setBuffer(WebGPUBuffer&, unsigned, unsigned);
>     void dispatch(WebGPUSize, WebGPUSize);
>     void endEncoding();
> 
>-    GPUComputeCommandEncoder* computeCommandEncoder() { return m_computeCommandEncoder.get(); }
>-
> private:
>-    WebGPUComputeCommandEncoder(WebGPURenderingContext*, WebGPUCommandBuffer*);
>-    RefPtr<GPUComputeCommandEncoder> m_computeCommandEncoder;
>+    WebGPUComputeCommandEncoder(WebGPURenderingContext&, const GPUCommandBuffer&);
>+
>+    GPUComputeCommandEncoder m_encoder;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUComputePipelineState.cpp b/Source/WebCore/html/canvas/WebGPUComputePipelineState.cpp
>index 57c03e7b62e891ab6decff9981a558ab4355c15a..a6e8d090adb715c1885ecc8551bd1f0caa40e56e 100644
>--- a/Source/WebCore/html/canvas/WebGPUComputePipelineState.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUComputePipelineState.cpp
>@@ -28,27 +28,19 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUComputePipelineState.h"
>-#include "WebGPUFunction.h"
>-#include "WebGPURenderingContext.h"
>-
> namespace WebCore {
> 
>-Ref<WebGPUComputePipelineState> WebGPUComputePipelineState::create(WebGPURenderingContext* context, WebGPUFunction* function)
>+Ref<WebGPUComputePipelineState> WebGPUComputePipelineState::create(WebGPURenderingContext& context, const GPUFunction& function)
> {
>     return adoptRef(*new WebGPUComputePipelineState(context, function));
> }
> 
>-WebGPUComputePipelineState::WebGPUComputePipelineState(WebGPURenderingContext* context, WebGPUFunction* function)
>-    : WebGPUObject(context)
>+WebGPUComputePipelineState::WebGPUComputePipelineState(WebGPURenderingContext& context, const GPUFunction& function)
>+    : WebGPUObject { &context }
>+    , m_state { context.device(), function }
> {
>-    if (!context || !function)
>-        return;
>-    m_computePipelineState = GPUComputePipelineState::create(context->device().get(), function->function());
> }
> 
>-WebGPUComputePipelineState::~WebGPUComputePipelineState() = default;
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/html/canvas/WebGPUComputePipelineState.h b/Source/WebCore/html/canvas/WebGPUComputePipelineState.h
>index 77596ff31c88b0b21cb98a6e4b5812bf4e4e86ad..c09ead0f14faf91eb76368666467c6987f68156c 100644
>--- a/Source/WebCore/html/canvas/WebGPUComputePipelineState.h
>+++ b/Source/WebCore/html/canvas/WebGPUComputePipelineState.h
>@@ -27,24 +27,23 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUComputePipelineState.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUComputePipelineState;
> class WebGPUFunction;
> 
> class WebGPUComputePipelineState : public WebGPUObject {
> public:
>-    virtual ~WebGPUComputePipelineState();
>-    static Ref<WebGPUComputePipelineState> create(WebGPURenderingContext*, WebGPUFunction*);
>-    GPUComputePipelineState* computePipelineState() { return m_computePipelineState.get(); }
>+    static Ref<WebGPUComputePipelineState> create(WebGPURenderingContext&, const GPUFunction&);
>+
>+    GPUComputePipelineState& state() { return m_state; }
> 
> private:
>-    WebGPUComputePipelineState(WebGPURenderingContext*, WebGPUFunction*);
>-    RefPtr<GPUComputePipelineState> m_computePipelineState;
>+    WebGPUComputePipelineState(WebGPURenderingContext&, const GPUFunction&);
>+
>+    GPUComputePipelineState m_state;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.cpp b/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.cpp
>index 2b901452fb7c5ee0f011b1cc3cd4f9ac345a512e..3cb359910abf7bdae9911ffe2684647d99832621 100644
>--- a/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.cpp
>@@ -28,41 +28,26 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDepthStencilDescriptor.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
> Ref<WebGPUDepthStencilDescriptor> WebGPUDepthStencilDescriptor::create()
> {
>-    return adoptRef(*new WebGPUDepthStencilDescriptor());
>+    return adoptRef(*new WebGPUDepthStencilDescriptor);
> }
> 
>-WebGPUDepthStencilDescriptor::WebGPUDepthStencilDescriptor()
>-    : WebGPUObject()
>-{
>-    m_depthStencilDescriptor = GPUDepthStencilDescriptor::create();
>-}
>-
>-WebGPUDepthStencilDescriptor::~WebGPUDepthStencilDescriptor() = default;
>-
> bool WebGPUDepthStencilDescriptor::depthWriteEnabled() const
> {
>-    if (!m_depthStencilDescriptor)
>-        return false;
>-
>-    return m_depthStencilDescriptor->depthWriteEnabled();
>+    return m_descriptor.depthWriteEnabled();
> }
> 
> void WebGPUDepthStencilDescriptor::setDepthWriteEnabled(bool newDepthWriteEnabled)
> {
>-    if (!m_depthStencilDescriptor)
>-        return;
>-
>-    m_depthStencilDescriptor->setDepthWriteEnabled(newDepthWriteEnabled);
>+    m_descriptor.setDepthWriteEnabled(newDepthWriteEnabled);
> }
> 
>-auto WebGPUDepthStencilDescriptor::depthCompareFunction() const -> WebGPUCompareFunction
>+WebGPUCompareFunction WebGPUDepthStencilDescriptor::depthCompareFunction() const
> {
>     return m_depthCompareFunction;
> }
>@@ -70,7 +55,7 @@ auto WebGPUDepthStencilDescriptor::depthCompareFunction() const -> WebGPUCompare
> void WebGPUDepthStencilDescriptor::setDepthCompareFunction(CompareFunction newDepthCompareFunction)
> {
>     m_depthCompareFunction = newDepthCompareFunction;
>-    m_depthStencilDescriptor->setDepthCompareFunction(toGPUCompareFunction(m_depthCompareFunction));
>+    m_descriptor.setDepthCompareFunction(toGPUCompareFunction(m_depthCompareFunction));
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.h b/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.h
>index 4cdb401c1ada43211bb000b39b319db0433ba458..617474f9623d54fb4c9eade7f690983f2fc5fa5b 100644
>--- a/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPUDepthStencilDescriptor.h
>@@ -27,18 +27,14 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUDepthStencilDescriptor.h"
> #include "WebGPUEnums.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUDepthStencilDescriptor;
>-
> class WebGPUDepthStencilDescriptor : public WebGPUObject {
> public:
>-    virtual ~WebGPUDepthStencilDescriptor();
>     static Ref<WebGPUDepthStencilDescriptor> create();
> 
>     bool depthWriteEnabled() const;
>@@ -48,13 +44,18 @@ public:
>     CompareFunction depthCompareFunction() const;
>     void setDepthCompareFunction(CompareFunction);
> 
>-    GPUDepthStencilDescriptor* depthStencilDescriptor() { return m_depthStencilDescriptor.get(); }
>+    GPUDepthStencilDescriptor& descriptor() { return m_descriptor; }
> 
> private:
>-    WebGPUDepthStencilDescriptor();
>+    WebGPUDepthStencilDescriptor() = default;
>+
>+    // FIXME: The default value of "Always" is defined both here and in the
>+    // GPUDepthStencilDescriptor class's implementation. Might be better to not
>+    // store the compare function separately here, translate it instead, and then
>+    // there would be no need for a default value here.
> 
>-    WebGPUCompareFunction m_depthCompareFunction;
>-    RefPtr<GPUDepthStencilDescriptor> m_depthStencilDescriptor;
>+    WebGPUCompareFunction m_depthCompareFunction { WebGPUCompareFunction::Always };
>+    GPUDepthStencilDescriptor m_descriptor;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUDepthStencilState.cpp b/Source/WebCore/html/canvas/WebGPUDepthStencilState.cpp
>index 2de9cf64bc23011f5d1e42cf39bee573a6829b15..e7289a3ed540682cd7a027824c52a7882b2d3b1c 100644
>--- a/Source/WebCore/html/canvas/WebGPUDepthStencilState.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUDepthStencilState.cpp
>@@ -28,41 +28,30 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDepthStencilState.h"
> #include "WebGPUDepthStencilDescriptor.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPUDepthStencilState> WebGPUDepthStencilState::create(WebGPURenderingContext* context, WebGPUDepthStencilDescriptor* descriptor)
>+Ref<WebGPUDepthStencilState> WebGPUDepthStencilState::create(WebGPURenderingContext& context, const GPUDepthStencilDescriptor& descriptor)
> {
>     return adoptRef(*new WebGPUDepthStencilState(context, descriptor));
> }
> 
>-WebGPUDepthStencilState::WebGPUDepthStencilState(WebGPURenderingContext* context, WebGPUDepthStencilDescriptor* descriptor)
>-    : WebGPUObject(context)
>+WebGPUDepthStencilState::WebGPUDepthStencilState(WebGPURenderingContext& context, const GPUDepthStencilDescriptor& descriptor)
>+    : WebGPUObject { &context }
>+    , m_state { context.device(), descriptor }
> {
>-    if (!context || !descriptor)
>-        return;
>-    m_depthStencilState = GPUDepthStencilState::create(context->device().get(), descriptor->depthStencilDescriptor());
> }
> 
>-WebGPUDepthStencilState::~WebGPUDepthStencilState() = default;
>-
> String WebGPUDepthStencilState::label() const
> {
>-    if (!m_depthStencilState)
>-        return emptyString();
>-
>-    return m_depthStencilState->label();
>+    return m_state.label();
> }
> 
> void WebGPUDepthStencilState::setLabel(const String& label)
> {
>-    if (!m_depthStencilState)
>-        return;
>-
>-    m_depthStencilState->setLabel(label);
>+    m_state.setLabel(label);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUDepthStencilState.h b/Source/WebCore/html/canvas/WebGPUDepthStencilState.h
>index ba97b86801579a24893d5d180de4a96a41b0a5c7..9155c2da045010bcc97f6547fd127bb2d489c4a7 100644
>--- a/Source/WebCore/html/canvas/WebGPUDepthStencilState.h
>+++ b/Source/WebCore/html/canvas/WebGPUDepthStencilState.h
>@@ -27,29 +27,24 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUDepthStencilState.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUDepthStencilState;
>-class WebGPUDepthStencilDescriptor;
>-
> class WebGPUDepthStencilState : public WebGPUObject {
> public:
>-    virtual ~WebGPUDepthStencilState();
>-    static Ref<WebGPUDepthStencilState> create(WebGPURenderingContext*, WebGPUDepthStencilDescriptor*);
>+    static Ref<WebGPUDepthStencilState> create(WebGPURenderingContext&, const GPUDepthStencilDescriptor&);
> 
>     String label() const;
>     void setLabel(const String&);
> 
>-    GPUDepthStencilState* depthStencilState() { return m_depthStencilState.get(); }
>+    GPUDepthStencilState& state() { return m_state; }
> 
> private:
>-    WebGPUDepthStencilState(WebGPURenderingContext*, WebGPUDepthStencilDescriptor*);
>+    WebGPUDepthStencilState(WebGPURenderingContext&, const GPUDepthStencilDescriptor&);
> 
>-    RefPtr<GPUDepthStencilState> m_depthStencilState;
>+    GPUDepthStencilState m_state;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUDrawable.cpp b/Source/WebCore/html/canvas/WebGPUDrawable.cpp
>index e1d12b9ce17775ba4771d185214ba2c307d03d17..913268d83cef722952c3a893dc2ab4c11ab48d2f 100644
>--- a/Source/WebCore/html/canvas/WebGPUDrawable.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUDrawable.cpp
>@@ -28,39 +28,26 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDrawable.h"
> #include "GPUTexture.h"
> #include "WebGPURenderingContext.h"
> #include "WebGPUTexture.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPUDrawable> WebGPUDrawable::create(WebGPURenderingContext* context)
>+Ref<WebGPUDrawable> WebGPUDrawable::create(WebGPURenderingContext& context)
> {
>     return adoptRef(*new WebGPUDrawable(context));
> }
> 
>-WebGPUDrawable::WebGPUDrawable(WebGPURenderingContext* context)
>-    : WebGPUObject(context)
>+WebGPUDrawable::WebGPUDrawable(WebGPURenderingContext& context)
>+    : WebGPUObject { &context }
>+    , m_drawable { context.device() }
>+    , m_texture { WebGPUTexture::createFromDrawableTexture(context, GPUTexture { m_drawable }) }
> {
>-    m_drawable = context->device()->getFramebuffer();
>-    if (!m_drawable)
>-        return;
>-
>-    auto drawableTexture = GPUTexture::createFromDrawable(m_drawable.get());
>-    m_texture = WebGPUTexture::createFromDrawableTexture(context, WTFMove(drawableTexture));
> }
> 
> WebGPUDrawable::~WebGPUDrawable() = default;
> 
>-WebGPUTexture* WebGPUDrawable::texture()
>-{
>-    if (!m_texture)
>-        return nullptr;
>-
>-    return m_texture.get();
>-}
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/html/canvas/WebGPUDrawable.h b/Source/WebCore/html/canvas/WebGPUDrawable.h
>index bcc1f8bc6371cdd1ddda12d5be38dad8928f3967..fc520558e8b807be7218b35b8eb94f5c10288684 100644
>--- a/Source/WebCore/html/canvas/WebGPUDrawable.h
>+++ b/Source/WebCore/html/canvas/WebGPUDrawable.h
>@@ -27,26 +27,26 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUDrawable.h"
> #include "WebGPUObject.h"
> 
> namespace WebCore {
> 
>-class GPUDrawable;
> class WebGPUTexture;
> 
> class WebGPUDrawable : public WebGPUObject {
> public:
>     virtual ~WebGPUDrawable();
>-    static Ref<WebGPUDrawable> create(WebGPURenderingContext*);
>+    static Ref<WebGPUDrawable> create(WebGPURenderingContext&);
> 
>-    WebGPUTexture* texture();
>-
>-    GPUDrawable* drawable() { return m_drawable.get(); }
>+    GPUDrawable& drawable() { return m_drawable; }
>+    WebGPUTexture& texture() { return m_texture.get(); }
> 
> private:
>-    WebGPUDrawable(WebGPURenderingContext*);
>-    RefPtr<GPUDrawable> m_drawable;
>-    RefPtr<WebGPUTexture> m_texture;
>+    explicit WebGPUDrawable(WebGPURenderingContext&);
>+
>+    GPUDrawable m_drawable;
>+    Ref<WebGPUTexture> m_texture;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUEnums.cpp b/Source/WebCore/html/canvas/WebGPUEnums.cpp
>index 2659014537dbe1d020ce7d84d8358feee4b4774f..46636ff46cfc28579533a6722f5faf7757649581 100644
>--- a/Source/WebCore/html/canvas/WebGPUEnums.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUEnums.cpp
>@@ -55,7 +55,7 @@ std::optional<WebGPUCompareFunction> toWebGPUCompareFunction(const String& name)
>     return std::nullopt;
> }
> 
>-String web3DCompareFunctionName(const WebGPUCompareFunction value)
>+String web3DCompareFunctionName(WebGPUCompareFunction value)
> {
>     if (value == WebGPUCompareFunction::Never)
>         return "never"_s;
>diff --git a/Source/WebCore/html/canvas/WebGPUEnums.h b/Source/WebCore/html/canvas/WebGPUEnums.h
>index 5f9faa585c763ee12d8d0faf5696145c2467bb64..43504e5d8de226be3343388292e1e7d9f897cea3 100644
>--- a/Source/WebCore/html/canvas/WebGPUEnums.h
>+++ b/Source/WebCore/html/canvas/WebGPUEnums.h
>@@ -27,8 +27,8 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include <wtf/Forward.h>
> #include <wtf/Optional.h>
>-#include <wtf/text/WTFString.h>
> 
> namespace WebCore {
> 
>@@ -46,8 +46,8 @@ enum class WebGPUCompareFunction {
> };
> 
> std::optional<WebGPUCompareFunction> toWebGPUCompareFunction(const String&);
>-String web3DCompareFunctionName(const WebGPUCompareFunction);
>-GPUCompareFunction toGPUCompareFunction(const WebGPUCompareFunction);
>+String web3DCompareFunctionName(WebGPUCompareFunction);
>+GPUCompareFunction toGPUCompareFunction(WebGPUCompareFunction);
> 
> } // namespace WebCore
> 
>diff --git a/Source/WebCore/html/canvas/WebGPUFunction.cpp b/Source/WebCore/html/canvas/WebGPUFunction.cpp
>index a7aa406208b988ff73feec0ce941bb17d6df8b07..8eab63cb466d5f9390a23ced3bbaa4d30c5168c1 100644
>--- a/Source/WebCore/html/canvas/WebGPUFunction.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUFunction.cpp
>@@ -28,32 +28,20 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUFunction.h"
>-#include "GPULibrary.h"
> #include "WebGPULibrary.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPUFunction> WebGPUFunction::create(WebGPURenderingContext* context, WebGPULibrary* library, const String& name)
>+Ref<WebGPUFunction> WebGPUFunction::create(WebGPURenderingContext& context, GPUFunction&& function)
> {
>-    return adoptRef(*new WebGPUFunction(context, library, name));
>+    return adoptRef(*new WebGPUFunction(context, WTFMove(function)));
> }
> 
>-WebGPUFunction::WebGPUFunction(WebGPURenderingContext* context, WebGPULibrary* library, const String& name)
>-    : WebGPUObject(context)
>+WebGPUFunction::WebGPUFunction(WebGPURenderingContext& context, GPUFunction&& function)
>+    : WebGPUObject { &context }
>+    , m_function { WTFMove(function) }
> {
>-    m_function = library->library()->functionWithName(name);
>-}
>-
>-WebGPUFunction::~WebGPUFunction() = default;
>-
>-String WebGPUFunction::name() const
>-{
>-    if (!m_function)
>-        return emptyString();
>-
>-    return m_function->name();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUFunction.h b/Source/WebCore/html/canvas/WebGPUFunction.h
>index 9f17d484ab15b10d1dc321181c2250d7d8ae8d1e..153fc891819d7f6263d0d4eca283f89004ee8f3e 100644
>--- a/Source/WebCore/html/canvas/WebGPUFunction.h
>+++ b/Source/WebCore/html/canvas/WebGPUFunction.h
>@@ -27,26 +27,22 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUFunction.h"
> #include "WebGPUObject.h"
> 
> namespace WebCore {
> 
>-class GPUFunction;
>-class WebGPULibrary;
>-
> class WebGPUFunction : public WebGPUObject {
> public:
>-    virtual ~WebGPUFunction();
>-    static Ref<WebGPUFunction> create(WebGPURenderingContext*, WebGPULibrary*, const String& name);
>-
>-    String name() const;
>+    static Ref<WebGPUFunction> create(WebGPURenderingContext&, GPUFunction&&);
> 
>-    GPUFunction* function() const { return m_function.get(); }
>+    String name() const { return m_function.name(); }
>+    const GPUFunction& function() const { return m_function; }
> 
> private:
>-    WebGPUFunction(WebGPURenderingContext*, WebGPULibrary*, const String& name);
>+    WebGPUFunction(WebGPURenderingContext&, GPUFunction&&);
> 
>-    RefPtr<GPUFunction> m_function;
>+    GPUFunction m_function;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPULibrary.cpp b/Source/WebCore/html/canvas/WebGPULibrary.cpp
>index d198edb6a53d8cb344b127ce38b9319790d075d0..6fa9e9778eb3dac18642c3593dbba02c97431a21 100644
>--- a/Source/WebCore/html/canvas/WebGPULibrary.cpp
>+++ b/Source/WebCore/html/canvas/WebGPULibrary.cpp
>@@ -28,59 +28,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPULibrary.h"
> #include "WebGPUFunction.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPULibrary> WebGPULibrary::create(WebGPURenderingContext* context, const String& sourceCode)
>+Ref<WebGPULibrary> WebGPULibrary::create(WebGPURenderingContext& context, const String& sourceCode)
> {
>     return adoptRef(*new WebGPULibrary(context, sourceCode));
> }
> 
>-WebGPULibrary::WebGPULibrary(WebGPURenderingContext* context, const String& sourceCode)
>-    : WebGPUObject(context)
>-    , m_sourceCode(sourceCode)
>+WebGPULibrary::WebGPULibrary(WebGPURenderingContext& context, const String& sourceCode)
>+    : WebGPUObject { &context }
>+    , m_sourceCode { sourceCode }
>+    , m_library { context.device(), sourceCode }
> {
>-    m_library = context->device()->createLibrary(sourceCode);
> }
> 
>-WebGPULibrary::~WebGPULibrary() = default;
>-
>-String WebGPULibrary::label() const
>-{
>-    if (!m_library)
>-        return emptyString();
>-
>-    return m_library->label();
>-}
>-
>-void WebGPULibrary::setLabel(const String& label)
>-{
>-    if (!m_library)
>-        return;
>-
>-    m_library->setLabel(label);
>-}
>-
>-Vector<String> WebGPULibrary::functionNames()
>+Vector<String> WebGPULibrary::functionNames() const
> {
>-    if (!m_library)
>-        return Vector<String>();
>-
>-    return m_library->functionNames();
>+    return m_library.functionNames();
> }
> 
>-RefPtr<WebGPUFunction> WebGPULibrary::functionWithName(const String& name)
>+RefPtr<WebGPUFunction> WebGPULibrary::functionWithName(const String& name) const
> {
>-    if (!m_library)
>-        return nullptr;
>-
>-    RefPtr<WebGPUFunction> function = WebGPUFunction::create(this->context(), this, name);
>-    if (!function->function())
>+    GPUFunction function { m_library, name };
>+    if (!function)
>         return nullptr;
>-    return function;
>+    return WebGPUFunction::create(*context(), WTFMove(function));
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPULibrary.h b/Source/WebCore/html/canvas/WebGPULibrary.h
>index b5ffab57a1bc7d913e488173a0a81a7db6e8bb29..0d2a1634e3c9efda0d42cc5a32c511d745371d4d 100644
>--- a/Source/WebCore/html/canvas/WebGPULibrary.h
>+++ b/Source/WebCore/html/canvas/WebGPULibrary.h
>@@ -27,36 +27,31 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPULibrary.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-#include <wtf/text/WTFString.h>
>-
> namespace WebCore {
> 
>-class GPULibrary;
> class WebGPUFunction;
> 
> class WebGPULibrary : public WebGPUObject {
> public:
>-    virtual ~WebGPULibrary();
>-    static Ref<WebGPULibrary> create(WebGPURenderingContext*, const String& sourceCode);
>+    static Ref<WebGPULibrary> create(WebGPURenderingContext&, const String& sourceCode);
> 
>-    String sourceCode() const { return m_sourceCode; }
>-    String label() const;
>-    void setLabel(const String&);
>+    const String& sourceCode() const { return m_sourceCode; }
> 
>-    Vector<String> functionNames();
>+    String label() const { return m_library.label(); }
>+    void setLabel(const String& label) { m_library.setLabel(label); }
> 
>-    RefPtr<WebGPUFunction> functionWithName(const String&);
>+    Vector<String> functionNames() const;
> 
>-    GPULibrary* library() { return m_library.get(); }
>+    RefPtr<WebGPUFunction> functionWithName(const String&) const;
> 
> private:
>-    WebGPULibrary(WebGPURenderingContext*, const String& sourceCode);
>+    WebGPULibrary(WebGPURenderingContext&, const String& sourceCode);
> 
>     String m_sourceCode;
>-    RefPtr<GPULibrary> m_library;
>+    GPULibrary m_library;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUObject.cpp b/Source/WebCore/html/canvas/WebGPUObject.cpp
>index 1a68ca89b76194f1591fbe326fcd440b03781723..8acb81e9af131847a894750b6783320faeb89b89 100644
>--- a/Source/WebCore/html/canvas/WebGPUObject.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUObject.cpp
>@@ -33,17 +33,12 @@
> namespace WebCore {
> 
> WebGPUObject::WebGPUObject(WebGPURenderingContext* context)
>-    : m_context(context)
>+    : m_context { context }
> {
> }
> 
> WebGPUObject::~WebGPUObject() = default;
> 
>-void WebGPUObject::deleteObject(GPUDevice*)
>-{
>-    m_deleted = true;
>-}
>-
> }
> 
> #endif
>diff --git a/Source/WebCore/html/canvas/WebGPUObject.h b/Source/WebCore/html/canvas/WebGPUObject.h
>index de2a73201be144af544048735dc97e52043736e7..c913003ffb1f02a0a025786a77577a0c730fb1fe 100644
>--- a/Source/WebCore/html/canvas/WebGPUObject.h
>+++ b/Source/WebCore/html/canvas/WebGPUObject.h
>@@ -27,9 +27,8 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
>-
> #include <wtf/RefCounted.h>
>+#include <wtf/RefPtr.h>
> 
> namespace WebCore {
> 
>@@ -39,19 +38,15 @@ class WebGPUObject : public RefCounted<WebGPUObject> {
> public:
>     virtual ~WebGPUObject();
> 
>-    void deleteObject(GPUDevice*);
>-    bool isDeleted() const { return m_deleted; }
>-
>-    WebGPURenderingContext* context() { return m_context.get(); }
>+    WebGPURenderingContext* context() const { return m_context.get(); }
> 
> protected:
>-    WebGPUObject(WebGPURenderingContext* = nullptr);
>+    explicit WebGPUObject(WebGPURenderingContext* = nullptr);
> 
>     bool hasContext() const { return m_context; }
> 
> private:
>     RefPtr<WebGPURenderingContext> m_context;
>-    bool m_deleted { false };
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.cpp b/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.cpp
>index 6ebd674f9193b141a848f0e0a269730f6fa7f822..79ca7822423a6ba71d25e1a205cabf555859f7f4 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.cpp
>@@ -29,7 +29,6 @@
> #if ENABLE(WEBGPU)
> 
> #include "GPUCommandBuffer.h"
>-#include "GPURenderCommandEncoder.h"
> #include "GPURenderPassDescriptor.h"
> #include "WebGPUBuffer.h"
> #include "WebGPUCommandBuffer.h"
>@@ -40,64 +39,47 @@
> 
> namespace WebCore {
> 
>-Ref<WebGPURenderCommandEncoder> WebGPURenderCommandEncoder::create(WebGPURenderingContext* context, WebGPUCommandBuffer* buffer, WebGPURenderPassDescriptor* descriptor)
>+Ref<WebGPURenderCommandEncoder> WebGPURenderCommandEncoder::create(WebGPURenderingContext& context, const GPUCommandBuffer& buffer, const GPURenderPassDescriptor& descriptor)
> {
>     return adoptRef(*new WebGPURenderCommandEncoder(context, buffer, descriptor));
> }
> 
>-WebGPURenderCommandEncoder::WebGPURenderCommandEncoder(WebGPURenderingContext* context, WebGPUCommandBuffer* buffer, WebGPURenderPassDescriptor* descriptor)
>-    : WebGPUObject(context)
>+WebGPURenderCommandEncoder::WebGPURenderCommandEncoder(WebGPURenderingContext& context, const GPUCommandBuffer& buffer, const GPURenderPassDescriptor& descriptor)
>+    : WebGPUObject { &context }
>+    , m_encoder { buffer, descriptor }
> {
>-    m_renderCommandEncoder = buffer->commandBuffer()->createRenderCommandEncoder(descriptor->renderPassDescriptor());
> }
> 
> WebGPURenderCommandEncoder::~WebGPURenderCommandEncoder() = default;
> 
> void WebGPURenderCommandEncoder::setRenderPipelineState(WebGPURenderPipelineState& pipelineState)
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-
>-    m_renderCommandEncoder->setRenderPipelineState(pipelineState.renderPipelineState());
>+    m_encoder.setRenderPipelineState(pipelineState.state());
> }
> 
> void WebGPURenderCommandEncoder::setDepthStencilState(WebGPUDepthStencilState& depthStencilState)
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-
>-    m_renderCommandEncoder->setDepthStencilState(depthStencilState.depthStencilState());
>+    m_encoder.setDepthStencilState(depthStencilState.state());
> }
> 
> void WebGPURenderCommandEncoder::setVertexBuffer(WebGPUBuffer& buffer, unsigned offset, unsigned index)
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-
>-    m_renderCommandEncoder->setVertexBuffer(buffer.buffer(), offset, index);
>+    m_encoder.setVertexBuffer(buffer.buffer(), offset, index);
> }
> 
> void WebGPURenderCommandEncoder::setFragmentBuffer(WebGPUBuffer& buffer, unsigned offset, unsigned index)
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-
>-    m_renderCommandEncoder->setFragmentBuffer(buffer.buffer(), offset, index);
>+    m_encoder.setFragmentBuffer(buffer.buffer(), offset, index);
> }
> 
> void WebGPURenderCommandEncoder::drawPrimitives(unsigned type, unsigned start, unsigned count)
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-
>-    m_renderCommandEncoder->drawPrimitives(type, start, count);
>+    m_encoder.drawPrimitives(type, start, count);
> }
> 
> void WebGPURenderCommandEncoder::endEncoding()
> {
>-    if (!m_renderCommandEncoder)
>-        return;
>-    return m_renderCommandEncoder->endEncoding();
>+    return m_encoder.endEncoding();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.h b/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.h
>index 66cec5974dec5a7fbee25ce3a944234f7ed936d5..f1c1aae0b4da897ea8dcd98ffc132902c90bc315 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderCommandEncoder.h
>@@ -27,27 +27,19 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPURenderCommandEncoder.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPURenderCommandEncoder;
>-class GPUBuffer;
>-class GPURenderPipelineState;
>-class GPUDepthStencilState;
>-class WebGPUCommandBuffer;
> class WebGPUDepthStencilState;
>-class WebGPURenderPassDescriptor;
>-class WebGPUFunction;
> class WebGPURenderPipelineState;
> class WebGPUBuffer;
> 
> class WebGPURenderCommandEncoder : public WebGPUObject {
> public:
>     virtual ~WebGPURenderCommandEncoder();
>-    static Ref<WebGPURenderCommandEncoder> create(WebGPURenderingContext*, WebGPUCommandBuffer*, WebGPURenderPassDescriptor*);
>+    static Ref<WebGPURenderCommandEncoder> create(WebGPURenderingContext&, const GPUCommandBuffer&, const GPURenderPassDescriptor&);
> 
>     void setRenderPipelineState(WebGPURenderPipelineState&);
>     void setDepthStencilState(WebGPUDepthStencilState&);
>@@ -56,11 +48,12 @@ public:
>     void drawPrimitives(unsigned type, unsigned start, unsigned count);
>     void endEncoding();
> 
>-    GPURenderCommandEncoder* renderCommandEncoder() { return m_renderCommandEncoder.get(); }
>+    GPURenderCommandEncoder& encoder() { return m_encoder; }
> 
> private:
>-    WebGPURenderCommandEncoder(WebGPURenderingContext*, WebGPUCommandBuffer*, WebGPURenderPassDescriptor*);
>-    RefPtr<GPURenderCommandEncoder> m_renderCommandEncoder;
>+    WebGPURenderCommandEncoder(WebGPURenderingContext&, const GPUCommandBuffer&, const GPURenderPassDescriptor&);
>+
>+    GPURenderCommandEncoder m_encoder;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.cpp
>index eab332038592023ebd9e86463603cf93321fd721..58978c6e69625f93365c6c85f1d9a94251e8bad9 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.cpp
>@@ -35,60 +35,47 @@
> 
> namespace WebCore {
> 
>-WebGPURenderPassAttachmentDescriptor::WebGPURenderPassAttachmentDescriptor(WebGPURenderingContext* context, GPURenderPassAttachmentDescriptor* descriptor)
>-    : WebGPUObject(context)
>-    , m_renderPassAttachmentDescriptor(descriptor)
>+WebGPURenderPassAttachmentDescriptor::WebGPURenderPassAttachmentDescriptor(WebGPURenderingContext& context)
>+    : WebGPUObject { &context }
> {
> }
> 
> WebGPURenderPassAttachmentDescriptor::~WebGPURenderPassAttachmentDescriptor() = default;
> 
>-unsigned long WebGPURenderPassAttachmentDescriptor::loadAction() const
>+unsigned WebGPURenderPassAttachmentDescriptor::loadAction() const
> {
>-    if (!m_renderPassAttachmentDescriptor)
>-        return 0; // FIXME: probably a real value for unknown
>-
>-    return m_renderPassAttachmentDescriptor->loadAction();
>+    return descriptor().loadAction();
> }
> 
>-void WebGPURenderPassAttachmentDescriptor::setLoadAction(unsigned long newLoadAction)
>+void WebGPURenderPassAttachmentDescriptor::setLoadAction(unsigned newLoadAction)
> {
>-    if (!m_renderPassAttachmentDescriptor)
>-        return;
>-
>-    m_renderPassAttachmentDescriptor->setLoadAction(newLoadAction);
>+    descriptor().setLoadAction(newLoadAction);
> }
> 
>-unsigned long WebGPURenderPassAttachmentDescriptor::storeAction() const
>+unsigned WebGPURenderPassAttachmentDescriptor::storeAction() const
> {
>-    if (!m_renderPassAttachmentDescriptor)
>-        return 0; // FIXME: probably a real value for unknown
>-
>-    return m_renderPassAttachmentDescriptor->storeAction();
>+    return descriptor().storeAction();
> }
> 
>-void WebGPURenderPassAttachmentDescriptor::setStoreAction(unsigned long newStoreAction)
>+void WebGPURenderPassAttachmentDescriptor::setStoreAction(unsigned newStoreAction)
> {
>-    if (!m_renderPassAttachmentDescriptor)
>-        return;
>-
>-    m_renderPassAttachmentDescriptor->setStoreAction(newStoreAction);
>+    descriptor().setStoreAction(newStoreAction);
> }
> 
>-RefPtr<WebGPUTexture> WebGPURenderPassAttachmentDescriptor::texture() const
>+WebGPUTexture* WebGPURenderPassAttachmentDescriptor::texture() const
> {
>-    return m_texture;
>+    return m_texture.get();
> }
> 
>-void WebGPURenderPassAttachmentDescriptor::setTexture(RefPtr<WebGPUTexture> newTexture)
>+void WebGPURenderPassAttachmentDescriptor::setTexture(RefPtr<WebGPUTexture>&& newTexture)
> {
>+    // FIXME: Why can't we set this to null?
>     if (!newTexture)
>         return;
>     
>-    m_texture = newTexture;
>-    
>-    if (m_renderPassAttachmentDescriptor)
>-        m_renderPassAttachmentDescriptor->setTexture(newTexture->texture());
>+    m_texture = WTFMove(newTexture);
>+
>+    descriptor().setTexture(m_texture->texture());
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.h
>index a6253f4f8e2bebf8e016739af8385393dd61b3c0..a35a32519df0353fe207c9baacd09c271ed022e9 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassAttachmentDescriptor.h
>@@ -29,8 +29,6 @@
> 
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
> class GPURenderPassAttachmentDescriptor;
>@@ -40,30 +38,26 @@ class WebGPURenderPassAttachmentDescriptor : public WebGPUObject {
> public:
>     virtual ~WebGPURenderPassAttachmentDescriptor();
> 
>-    unsigned long loadAction() const;
>-    void setLoadAction(unsigned long);
>-
>-    unsigned long storeAction() const;
>-    void setStoreAction(unsigned long);
>+    unsigned loadAction() const;
>+    void setLoadAction(unsigned);
> 
>-    RefPtr<WebGPUTexture> texture() const;
>-    void setTexture(RefPtr<WebGPUTexture>);
>+    unsigned storeAction() const;
>+    void setStoreAction(unsigned);
> 
>-    GPURenderPassAttachmentDescriptor* renderPassAttachmentDescriptor() const { return m_renderPassAttachmentDescriptor.get(); }
>+    WebGPUTexture* texture() const;
>+    void setTexture(RefPtr<WebGPUTexture>&&);
> 
>-    virtual bool isColorAttachmentDescriptor() const { return false; }
>+    virtual bool isColorAttachmentDescriptor() const = 0;
> 
> protected:
>-
>-    WebGPURenderPassAttachmentDescriptor(WebGPURenderingContext*, GPURenderPassAttachmentDescriptor*);
>-
>+    explicit WebGPURenderPassAttachmentDescriptor(WebGPURenderingContext&);
> 
> private:
>+    virtual const GPURenderPassAttachmentDescriptor& descriptor() const = 0;
> 
>-    RefPtr<GPURenderPassAttachmentDescriptor> m_renderPassAttachmentDescriptor;
>     RefPtr<WebGPUTexture> m_texture;
> };
>-    
>+
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.cpp
>index 83cdda6aabf09f9c1dce2e7840246e5407ff222e..3ec3d4f58d8b27118103f685ae79d263311296d3 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.cpp
>@@ -28,47 +28,38 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPassColorAttachmentDescriptor.h"
> #include "GPUTexture.h"
> #include "WebGPURenderingContext.h"
> #include "WebGPUTexture.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPURenderPassColorAttachmentDescriptor> WebGPURenderPassColorAttachmentDescriptor::create(WebGPURenderingContext* context, GPURenderPassColorAttachmentDescriptor* descriptor)
>+Ref<WebGPURenderPassColorAttachmentDescriptor> WebGPURenderPassColorAttachmentDescriptor::create(WebGPURenderingContext& context, GPURenderPassColorAttachmentDescriptor&& descriptor)
> {
>-    return adoptRef(*new WebGPURenderPassColorAttachmentDescriptor(context, descriptor));
>+    return adoptRef(*new WebGPURenderPassColorAttachmentDescriptor(context, WTFMove(descriptor)));
> }
> 
>-WebGPURenderPassColorAttachmentDescriptor::WebGPURenderPassColorAttachmentDescriptor(WebGPURenderingContext* context, GPURenderPassColorAttachmentDescriptor* descriptor)
>-    : WebGPURenderPassAttachmentDescriptor(context, descriptor)
>+WebGPURenderPassColorAttachmentDescriptor::WebGPURenderPassColorAttachmentDescriptor(WebGPURenderingContext& context, GPURenderPassColorAttachmentDescriptor&& descriptor)
>+    : WebGPURenderPassAttachmentDescriptor(context)
>+    , m_descriptor(WTFMove(descriptor))
> {
> }
> 
> WebGPURenderPassColorAttachmentDescriptor::~WebGPURenderPassColorAttachmentDescriptor() = default;
> 
>-GPURenderPassColorAttachmentDescriptor* WebGPURenderPassColorAttachmentDescriptor::renderPassColorAttachmentDescriptor() const
>+const GPURenderPassAttachmentDescriptor& WebGPURenderPassColorAttachmentDescriptor::descriptor() const
> {
>-    return static_cast<GPURenderPassColorAttachmentDescriptor*>(renderPassAttachmentDescriptor());
>+    return m_descriptor;
> }
> 
> Vector<float> WebGPURenderPassColorAttachmentDescriptor::clearColor() const
> {
>-    RefPtr<GPURenderPassColorAttachmentDescriptor> descriptor = renderPassColorAttachmentDescriptor();
>-    if (!descriptor) {
>-        Vector<float> black = { 0.0, 0.0, 0.0, 1.0 };
>-        return black;
>-    }
>-    return descriptor->clearColor();
>+    return m_descriptor.clearColor();
> }
> 
> void WebGPURenderPassColorAttachmentDescriptor::setClearColor(const Vector<float>& newClearColor)
> {
>-    RefPtr<GPURenderPassColorAttachmentDescriptor> descriptor = renderPassColorAttachmentDescriptor();
>-    if (!descriptor)
>-        return;
>-
>-    descriptor->setClearColor(newClearColor);
>+    m_descriptor.setClearColor(newClearColor);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.h
>index ee8971605924aef37aa89b1e8d2fa83cd8567e09..5646faa79939f2cddc1f88ec6a75af263e13ba26 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassColorAttachmentDescriptor.h
>@@ -27,30 +27,26 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "WebGPUObject.h"
>+#include "GPURenderPassColorAttachmentDescriptor.h"
> #include "WebGPURenderPassAttachmentDescriptor.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPURenderPassColorAttachmentDescriptor;
>-
> class WebGPURenderPassColorAttachmentDescriptor : public WebGPURenderPassAttachmentDescriptor {
> public:
>     virtual ~WebGPURenderPassColorAttachmentDescriptor();
>-    static Ref<WebGPURenderPassColorAttachmentDescriptor> create(WebGPURenderingContext*, GPURenderPassColorAttachmentDescriptor*);
>+    static Ref<WebGPURenderPassColorAttachmentDescriptor> create(WebGPURenderingContext&, GPURenderPassColorAttachmentDescriptor&&);
> 
>     Vector<float> clearColor() const;
>     void setClearColor(const Vector<float>&);
> 
>-    GPURenderPassColorAttachmentDescriptor* renderPassColorAttachmentDescriptor() const;
>-
>-    bool isColorAttachmentDescriptor() const override { return true; }
>-
> private:
>-    WebGPURenderPassColorAttachmentDescriptor(WebGPURenderingContext*, GPURenderPassColorAttachmentDescriptor*);
>+    WebGPURenderPassColorAttachmentDescriptor(WebGPURenderingContext&, GPURenderPassColorAttachmentDescriptor&&);
>+
>+    const GPURenderPassAttachmentDescriptor& descriptor() const final;
>+    bool isColorAttachmentDescriptor() const final { return true; }
> 
>+    GPURenderPassColorAttachmentDescriptor m_descriptor;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.cpp
>index 5c4f8347a4530a6bb77787f94dbe0c44d7b6aaa8..692167986b075c3842139a9da9a1cf4781cbf64b 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.cpp
>@@ -28,20 +28,19 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPassDepthAttachmentDescriptor.h"
>-#include "GPUTexture.h"
> #include "WebGPURenderingContext.h"
> #include "WebGPUTexture.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPURenderPassDepthAttachmentDescriptor> WebGPURenderPassDepthAttachmentDescriptor::create(WebGPURenderingContext* context, GPURenderPassDepthAttachmentDescriptor* descriptor)
>+Ref<WebGPURenderPassDepthAttachmentDescriptor> WebGPURenderPassDepthAttachmentDescriptor::create(WebGPURenderingContext& context, GPURenderPassDepthAttachmentDescriptor&& descriptor)
> {
>-    return adoptRef(*new WebGPURenderPassDepthAttachmentDescriptor(context, descriptor));
>+    return adoptRef(*new WebGPURenderPassDepthAttachmentDescriptor(context, WTFMove(descriptor)));
> }
> 
>-WebGPURenderPassDepthAttachmentDescriptor::WebGPURenderPassDepthAttachmentDescriptor(WebGPURenderingContext* context, GPURenderPassDepthAttachmentDescriptor* descriptor)
>-    : WebGPURenderPassAttachmentDescriptor(context, descriptor)
>+WebGPURenderPassDepthAttachmentDescriptor::WebGPURenderPassDepthAttachmentDescriptor(WebGPURenderingContext& context, GPURenderPassDepthAttachmentDescriptor&& descriptor)
>+    : WebGPURenderPassAttachmentDescriptor(context)
>+    , m_descriptor(WTFMove(descriptor))
> {
> }
> 
>@@ -49,25 +48,17 @@ WebGPURenderPassDepthAttachmentDescriptor::~WebGPURenderPassDepthAttachmentDescr
> 
> double WebGPURenderPassDepthAttachmentDescriptor::clearDepth() const
> {
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> descriptor = renderPassDepthAttachmentDescriptor();
>-    if (!descriptor)
>-        return 0;
>-
>-    return descriptor->clearDepth();
>+    return m_descriptor.clearDepth();
> }
> 
> void WebGPURenderPassDepthAttachmentDescriptor::setClearDepth(double newClearDepth)
> {
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> descriptor = renderPassDepthAttachmentDescriptor();
>-    if (!descriptor)
>-        return;
>-    
>-    descriptor->setClearDepth(newClearDepth);
>+    m_descriptor.setClearDepth(newClearDepth);
> }
> 
>-GPURenderPassDepthAttachmentDescriptor* WebGPURenderPassDepthAttachmentDescriptor::renderPassDepthAttachmentDescriptor() const
>+const GPURenderPassAttachmentDescriptor& WebGPURenderPassDepthAttachmentDescriptor::descriptor() const
> {
>-    return static_cast<GPURenderPassDepthAttachmentDescriptor*>(renderPassAttachmentDescriptor());
>+    return m_descriptor;
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.h
>index 603154c6c9fff1d1486105a650455552bf92af35..a419366491662ea6154603a32bb34190388376bc 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassDepthAttachmentDescriptor.h
>@@ -27,26 +27,26 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "WebGPUObject.h"
>+#include "GPURenderPassDepthAttachmentDescriptor.h"
> #include "WebGPURenderPassAttachmentDescriptor.h"
> 
> namespace WebCore {
> 
>-class GPURenderPassDepthAttachmentDescriptor;
>-
>-class WebGPURenderPassDepthAttachmentDescriptor : public WebGPURenderPassAttachmentDescriptor {
>+class WebGPURenderPassDepthAttachmentDescriptor final : public WebGPURenderPassAttachmentDescriptor {
> public:
>     virtual ~WebGPURenderPassDepthAttachmentDescriptor();
>-    static Ref<WebGPURenderPassDepthAttachmentDescriptor> create(WebGPURenderingContext*, GPURenderPassDepthAttachmentDescriptor*);
>+    static Ref<WebGPURenderPassDepthAttachmentDescriptor> create(WebGPURenderingContext&, GPURenderPassDepthAttachmentDescriptor&&);
> 
>     double clearDepth() const;
>     void setClearDepth(double);
> 
>-    GPURenderPassDepthAttachmentDescriptor* renderPassDepthAttachmentDescriptor() const;
>-
> private:
>-    WebGPURenderPassDepthAttachmentDescriptor(WebGPURenderingContext*, GPURenderPassDepthAttachmentDescriptor*);
>+    WebGPURenderPassDepthAttachmentDescriptor(WebGPURenderingContext&, GPURenderPassDepthAttachmentDescriptor&&);
>+
>+    const GPURenderPassAttachmentDescriptor& descriptor() const final;
>+    bool isColorAttachmentDescriptor() const final { return false; }
> 
>+    GPURenderPassDepthAttachmentDescriptor m_descriptor;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.cpp
>index e7bef852c9ccde6f73f4e635a0a0356c376d47f4..4f5595ad493d40da55f90fedc077c93c5e3658d3 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.cpp
>@@ -28,51 +28,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPassColorAttachmentDescriptor.h"
>-#include "GPURenderPassDepthAttachmentDescriptor.h"
>-#include "GPURenderPassDescriptor.h"
>-#include "WebGPURenderPassColorAttachmentDescriptor.h"
>-#include "WebGPURenderPassDepthAttachmentDescriptor.h"
>-#include "WebGPURenderingContext.h"
>-
> namespace WebCore {
> 
> Ref<WebGPURenderPassDescriptor> WebGPURenderPassDescriptor::create()
> {
>-    return adoptRef(*new WebGPURenderPassDescriptor());
>+    return adoptRef(*new WebGPURenderPassDescriptor);
> }
> 
>-WebGPURenderPassDescriptor::WebGPURenderPassDescriptor()
>-    : WebGPUObject()
>-{
>-    m_renderPassDescriptor = GPURenderPassDescriptor::create();
>-}
>+WebGPURenderPassDescriptor::WebGPURenderPassDescriptor() = default;
> 
> WebGPURenderPassDescriptor::~WebGPURenderPassDescriptor() = default;
> 
>-RefPtr<WebGPURenderPassDepthAttachmentDescriptor> WebGPURenderPassDescriptor::depthAttachment()
>+WebGPURenderPassDepthAttachmentDescriptor& WebGPURenderPassDescriptor::depthAttachment()
> {
>-    if (!m_renderPassDescriptor)
>-        return nullptr;
>-
>-    if (!m_depthAttachmentDescriptor) {
>-        RefPtr<GPURenderPassDepthAttachmentDescriptor> platformDepthAttachment = m_renderPassDescriptor->depthAttachment();
>-        m_depthAttachmentDescriptor = WebGPURenderPassDepthAttachmentDescriptor::create(this->context(), platformDepthAttachment.get());
>-    }
>-    return m_depthAttachmentDescriptor;
>+    if (!m_depthAttachment)
>+        m_depthAttachment = WebGPURenderPassDepthAttachmentDescriptor::create(*context(), m_descriptor.depthAttachment());
>+    return *m_depthAttachment;
> }
> 
>-Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>> WebGPURenderPassDescriptor::colorAttachments()
>+const Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>>& WebGPURenderPassDescriptor::colorAttachments()
> {
>-    if (!m_renderPassDescriptor)
>-        return Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>>();
>-
>-    if (!m_colorAttachmentDescriptors.size()) {
>-        Vector<RefPtr<GPURenderPassColorAttachmentDescriptor>> platformColorAttachments = m_renderPassDescriptor->colorAttachments();
>-        for (auto& attachment : platformColorAttachments)
>-            m_colorAttachmentDescriptors.append(WebGPURenderPassColorAttachmentDescriptor::create(this->context(), attachment.get()));
>+    if (m_colorAttachments.isEmpty()) {
>+        auto attachments = m_descriptor.colorAttachments();
>+        ASSERT(!attachments.isEmpty());
>+        m_colorAttachments.reserveInitialCapacity(attachments.size());
>+        for (auto& attachment : attachments)
>+            m_colorAttachments.uncheckedAppend(WebGPURenderPassColorAttachmentDescriptor::create(*context(), WTFMove(attachment)));
>     }
>-    return m_colorAttachmentDescriptors;
>+    return m_colorAttachments;
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.h
>index b9d187273a06d31f9b79cc98dae0c0b6de11f9a7..d135faff67506cad6a75d8742c680eeeeb6a99fc 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPassDescriptor.h
>@@ -27,35 +27,31 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPURenderPassDescriptor.h"
> #include "WebGPUObject.h"
> #include "WebGPURenderPassColorAttachmentDescriptor.h"
> #include "WebGPURenderPassDepthAttachmentDescriptor.h"
>-
> #include <wtf/Vector.h>
> 
> namespace WebCore {
> 
>-class GPURenderPassDescriptor;
>-class WebGPURenderPassColorAttachmentDescriptor;
>-class WebGPURenderPassDepthAttachmentDescriptor;
>-
> class WebGPURenderPassDescriptor : public WebGPUObject {
> public:
>     virtual ~WebGPURenderPassDescriptor();
>     static Ref<WebGPURenderPassDescriptor> create();
> 
>-    RefPtr<WebGPURenderPassDepthAttachmentDescriptor> depthAttachment();
>-    Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>> colorAttachments();
>+    WebGPURenderPassDepthAttachmentDescriptor& depthAttachment();
>+    const Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>>& colorAttachments();
> 
>-    GPURenderPassDescriptor* renderPassDescriptor() { return m_renderPassDescriptor.get(); }
>+    const GPURenderPassDescriptor& descriptor() const { return m_descriptor; }
> 
> private:
>     WebGPURenderPassDescriptor();
> 
>-    Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>> m_colorAttachmentDescriptors;
>-    RefPtr<WebGPURenderPassDepthAttachmentDescriptor> m_depthAttachmentDescriptor;
>+    Vector<RefPtr<WebGPURenderPassColorAttachmentDescriptor>> m_colorAttachments;
>+    RefPtr<WebGPURenderPassDepthAttachmentDescriptor> m_depthAttachment;
> 
>-    RefPtr<GPURenderPassDescriptor> m_renderPassDescriptor;
>+    GPURenderPassDescriptor m_descriptor;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.cpp
>index f868882b2fe9de8f9940c136cc479933996c166d..9491196026bee723b06576fe4c6b1ca49dc19c61 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.cpp
>@@ -28,38 +28,27 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPipelineColorAttachmentDescriptor.h"
>-#include "WebGPURenderingContext.h"
>-
> namespace WebCore {
> 
>-Ref<WebGPURenderPipelineColorAttachmentDescriptor> WebGPURenderPipelineColorAttachmentDescriptor::create(WebGPURenderingContext* context, GPURenderPipelineColorAttachmentDescriptor* descriptor)
>+Ref<WebGPURenderPipelineColorAttachmentDescriptor> WebGPURenderPipelineColorAttachmentDescriptor::create(WebGPURenderingContext& context, GPURenderPipelineColorAttachmentDescriptor&& descriptor)
> {
>-    return adoptRef(*new WebGPURenderPipelineColorAttachmentDescriptor(context, descriptor));
>+    return adoptRef(*new WebGPURenderPipelineColorAttachmentDescriptor(context, WTFMove(descriptor)));
> }
> 
>-WebGPURenderPipelineColorAttachmentDescriptor::WebGPURenderPipelineColorAttachmentDescriptor(WebGPURenderingContext* context, GPURenderPipelineColorAttachmentDescriptor* descriptor)
>-    : WebGPUObject(context)
>-    , m_renderPipelineColorAttachmentDescriptor(descriptor)
>+WebGPURenderPipelineColorAttachmentDescriptor::WebGPURenderPipelineColorAttachmentDescriptor(WebGPURenderingContext& context, GPURenderPipelineColorAttachmentDescriptor&& descriptor)
>+    : WebGPUObject { &context }
>+    , m_descriptor { WTFMove(descriptor) }
> {
> }
> 
>-WebGPURenderPipelineColorAttachmentDescriptor::~WebGPURenderPipelineColorAttachmentDescriptor() = default;
>-
>-unsigned long WebGPURenderPipelineColorAttachmentDescriptor::pixelFormat() const
>+unsigned WebGPURenderPipelineColorAttachmentDescriptor::pixelFormat() const
> {
>-    if (!m_renderPipelineColorAttachmentDescriptor)
>-        return 0; // FIXME: probably a real value for unknown
>-
>-    return m_renderPipelineColorAttachmentDescriptor->pixelFormat();
>+    return m_descriptor.pixelFormat();
> }
> 
>-void WebGPURenderPipelineColorAttachmentDescriptor::setPixelFormat(unsigned long newPixelFormat)
>+void WebGPURenderPipelineColorAttachmentDescriptor::setPixelFormat(unsigned newPixelFormat)
> {
>-    if (!m_renderPipelineColorAttachmentDescriptor)
>-        return;
>-
>-    m_renderPipelineColorAttachmentDescriptor->setPixelFormat(newPixelFormat);
>+    m_descriptor.setPixelFormat(newPixelFormat);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.h
>index 7a4aaff5c487050d8b17fdb0e61f54fea5ce2ec1..12e18595b7e12ac721c3affd72f8c2a5061be7e7 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineColorAttachmentDescriptor.h
>@@ -27,27 +27,22 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPURenderPipelineColorAttachmentDescriptor.h"
> #include "WebGPUObject.h"
> 
>-
> namespace WebCore {
> 
>-class GPURenderPipelineColorAttachmentDescriptor;
>-
> class WebGPURenderPipelineColorAttachmentDescriptor : public WebGPUObject {
> public:
>-    virtual ~WebGPURenderPipelineColorAttachmentDescriptor();
>-    static Ref<WebGPURenderPipelineColorAttachmentDescriptor> create(WebGPURenderingContext*, GPURenderPipelineColorAttachmentDescriptor*);
>-
>-    unsigned long pixelFormat() const;
>-    void setPixelFormat(unsigned long);
>+    static Ref<WebGPURenderPipelineColorAttachmentDescriptor> create(WebGPURenderingContext&, GPURenderPipelineColorAttachmentDescriptor&&);
> 
>-    GPURenderPipelineColorAttachmentDescriptor* renderPipelineColorAttachmentDescriptor() { return m_renderPipelineColorAttachmentDescriptor.get(); }
>+    unsigned pixelFormat() const;
>+    void setPixelFormat(unsigned);
> 
> private:
>-    WebGPURenderPipelineColorAttachmentDescriptor(WebGPURenderingContext*, GPURenderPipelineColorAttachmentDescriptor*);
>+    WebGPURenderPipelineColorAttachmentDescriptor(WebGPURenderingContext&, GPURenderPipelineColorAttachmentDescriptor&&);
> 
>-    RefPtr<GPURenderPipelineColorAttachmentDescriptor> m_renderPipelineColorAttachmentDescriptor;
>+    GPURenderPipelineColorAttachmentDescriptor m_descriptor;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.cpp b/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.cpp
>index be29c8ba5305008b4161809c5f26c73242755256..9eff795287cb164397053c2c09f55881d9b5ae77 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.cpp
>@@ -30,7 +30,6 @@
> 
> #include "GPUFunction.h"
> #include "GPURenderPipelineColorAttachmentDescriptor.h"
>-#include "GPURenderPipelineDescriptor.h"
> #include "WebGPUFunction.h"
> #include "WebGPURenderPipelineColorAttachmentDescriptor.h"
> #include "WebGPURenderingContext.h"
>@@ -39,83 +38,72 @@ namespace WebCore {
> 
> Ref<WebGPURenderPipelineDescriptor> WebGPURenderPipelineDescriptor::create()
> {
>-    return adoptRef(*new WebGPURenderPipelineDescriptor());
>+    return adoptRef(*new WebGPURenderPipelineDescriptor);
> }
> 
>-WebGPURenderPipelineDescriptor::WebGPURenderPipelineDescriptor()
>-    : WebGPUObject()
>-{
>-    m_renderPipelineDescriptor = GPURenderPipelineDescriptor::create();
>-}
>+WebGPURenderPipelineDescriptor::WebGPURenderPipelineDescriptor() = default;
> 
> WebGPURenderPipelineDescriptor::~WebGPURenderPipelineDescriptor() = default;
> 
>-RefPtr<WebGPUFunction> WebGPURenderPipelineDescriptor::vertexFunction() const
>+WebGPUFunction* WebGPURenderPipelineDescriptor::vertexFunction() const
> {
>-    return m_vertexFunction;
>+    return m_vertexFunction.get();
> }
> 
>-void WebGPURenderPipelineDescriptor::setVertexFunction(RefPtr<WebGPUFunction> newVertexFunction)
>+void WebGPURenderPipelineDescriptor::setVertexFunction(RefPtr<WebGPUFunction>&& newVertexFunction)
> {
>+    // FIXME: Why can't we set this to null?
>     if (!newVertexFunction)
>         return;
> 
>-    m_vertexFunction = newVertexFunction;
>+    m_vertexFunction = WTFMove(newVertexFunction);
> 
>-    if (m_renderPipelineDescriptor)
>-        m_renderPipelineDescriptor->setVertexFunction(newVertexFunction->function());
>+    m_descriptor.setVertexFunction(m_vertexFunction->function());
> }
> 
>-RefPtr<WebGPUFunction> WebGPURenderPipelineDescriptor::fragmentFunction() const
>+WebGPUFunction* WebGPURenderPipelineDescriptor::fragmentFunction() const
> {
>-    return m_fragmentFunction;
>+    return m_fragmentFunction.get();
> }
> 
>-void WebGPURenderPipelineDescriptor::setFragmentFunction(RefPtr<WebGPUFunction> newFragmentFunction)
>+void WebGPURenderPipelineDescriptor::setFragmentFunction(RefPtr<WebGPUFunction>&& newFragmentFunction)
> {
>+    // FIXME: Why can't we set this to null?
>     if (!newFragmentFunction)
>         return;
> 
>-    m_fragmentFunction = newFragmentFunction;
>+    m_fragmentFunction = WTFMove(newFragmentFunction);
> 
>-    if (m_renderPipelineDescriptor)
>-        m_renderPipelineDescriptor->setFragmentFunction(newFragmentFunction->function());
>+    m_descriptor.setFragmentFunction(m_fragmentFunction->function());
> }
> 
>-Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>> WebGPURenderPipelineDescriptor::colorAttachments()
>+const Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>>& WebGPURenderPipelineDescriptor::colorAttachments()
> {
>-    if (!m_renderPipelineDescriptor)
>-        return Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>>();
>-
>-    if (!m_colorAttachmentDescriptors.size()) {
>-        Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>> platformColorAttachments = m_renderPipelineDescriptor->colorAttachments();
>-        for (auto& attachment : platformColorAttachments)
>-            m_colorAttachmentDescriptors.append(WebGPURenderPipelineColorAttachmentDescriptor::create(this->context(), attachment.get()));
>+    if (!m_colorAttachments.size()) {
>+        auto attachments = m_descriptor.colorAttachments();
>+        m_colorAttachments.reserveInitialCapacity(attachments.size());
>+        for (auto& attachment : attachments)
>+            m_colorAttachments.uncheckedAppend(WebGPURenderPipelineColorAttachmentDescriptor::create(*context(), WTFMove(attachment)));
>     }
>-    return m_colorAttachmentDescriptors;
>+    return m_colorAttachments;
> }
> 
>-unsigned long WebGPURenderPipelineDescriptor::depthAttachmentPixelFormat() const
>+unsigned WebGPURenderPipelineDescriptor::depthAttachmentPixelFormat() const
> {
>-    if (!m_renderPipelineDescriptor)
>-        return 0; // FIXME: probably a real value for unknown
>-
>-    return m_renderPipelineDescriptor->depthAttachmentPixelFormat();
>-
>+    return m_descriptor.depthAttachmentPixelFormat();
> }
> 
>-void WebGPURenderPipelineDescriptor::setDepthAttachmentPixelFormat(unsigned long newPixelFormat)
>+void WebGPURenderPipelineDescriptor::setDepthAttachmentPixelFormat(unsigned newPixelFormat)
> {
>-    if (!m_renderPipelineDescriptor)
>-        return;
>-
>-    m_renderPipelineDescriptor->setDepthAttachmentPixelFormat(newPixelFormat);
>+    m_descriptor.setDepthAttachmentPixelFormat(newPixelFormat);
> }
> 
> void WebGPURenderPipelineDescriptor::reset()
> {
>     m_vertexFunction = nullptr;
>     m_fragmentFunction = nullptr;
>+
>+    // FIXME: Why doesn't this clear out the functions on m_descriptor?
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.h b/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.h
>index 874e3df0c10c686d10b3077db03025e41096078f..c293492d65dbd27cea05d0c02c58b107fb2de240 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineDescriptor.h
>@@ -27,9 +27,9 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPURenderPipelineDescriptor.h"
> #include "WebGPUObject.h"
> #include "WebGPURenderPipelineColorAttachmentDescriptor.h"
>-
> #include <wtf/Vector.h>
> 
> namespace WebCore {
>@@ -44,20 +44,20 @@ public:
>     virtual ~WebGPURenderPipelineDescriptor();
>     static Ref<WebGPURenderPipelineDescriptor> create();
> 
>-    RefPtr<WebGPUFunction> vertexFunction() const;
>-    void setVertexFunction(RefPtr<WebGPUFunction>);
>+    WebGPUFunction* vertexFunction() const;
>+    void setVertexFunction(RefPtr<WebGPUFunction>&&);
> 
>-    RefPtr<WebGPUFunction> fragmentFunction() const;
>-    void setFragmentFunction(RefPtr<WebGPUFunction>);
>+    WebGPUFunction* fragmentFunction() const;
>+    void setFragmentFunction(RefPtr<WebGPUFunction>&&);
> 
>-    Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>> colorAttachments();
>+    const Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>>& colorAttachments();
> 
>-    unsigned long depthAttachmentPixelFormat() const;
>-    void setDepthAttachmentPixelFormat(unsigned long);
>+    unsigned depthAttachmentPixelFormat() const;
>+    void setDepthAttachmentPixelFormat(unsigned);
> 
>     void reset();
> 
>-    GPURenderPipelineDescriptor* renderPipelineDescriptor() { return m_renderPipelineDescriptor.get(); }
>+    const GPURenderPipelineDescriptor& descriptor() { return m_descriptor; }
> 
> private:
>     WebGPURenderPipelineDescriptor();
>@@ -65,9 +65,9 @@ private:
>     RefPtr<WebGPUFunction> m_vertexFunction;
>     RefPtr<WebGPUFunction> m_fragmentFunction;
> 
>-    Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>> m_colorAttachmentDescriptors;
>+    Vector<RefPtr<WebGPURenderPipelineColorAttachmentDescriptor>> m_colorAttachments;
> 
>-    RefPtr<GPURenderPipelineDescriptor> m_renderPipelineDescriptor;
>+    GPURenderPipelineDescriptor m_descriptor;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineState.cpp b/Source/WebCore/html/canvas/WebGPURenderPipelineState.cpp
>index e2b1afd0e90703fd67bbee443cbd6cfa7c29151d..f3c713ebb05c567d44f9cb3ea45a15075b756a75 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineState.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineState.cpp
>@@ -28,41 +28,30 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPipelineState.h"
> #include "WebGPURenderPipelineDescriptor.h"
> #include "WebGPURenderingContext.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPURenderPipelineState> WebGPURenderPipelineState::create(WebGPURenderingContext* context, WebGPURenderPipelineDescriptor* descriptor)
>+Ref<WebGPURenderPipelineState> WebGPURenderPipelineState::create(WebGPURenderingContext& context, const GPURenderPipelineDescriptor& descriptor)
> {
>     return adoptRef(*new WebGPURenderPipelineState(context, descriptor));
> }
> 
>-WebGPURenderPipelineState::WebGPURenderPipelineState(WebGPURenderingContext* context, WebGPURenderPipelineDescriptor* descriptor)
>-    : WebGPUObject(context)
>+WebGPURenderPipelineState::WebGPURenderPipelineState(WebGPURenderingContext& context, const GPURenderPipelineDescriptor& descriptor)
>+    : WebGPUObject { &context }
>+    , m_state { context.device(), descriptor }
> {
>-    if (!context || !descriptor)
>-        return;
>-    m_renderPipelineState = GPURenderPipelineState::create(context->device().get(), descriptor->renderPipelineDescriptor());
> }
> 
>-WebGPURenderPipelineState::~WebGPURenderPipelineState() = default;
>-
> String WebGPURenderPipelineState::label() const
> {
>-    if (!m_renderPipelineState)
>-        return emptyString();
>-
>-    return m_renderPipelineState->label();
>+    return m_state.label();
> }
> 
> void WebGPURenderPipelineState::setLabel(const String& label)
> {
>-    if (!m_renderPipelineState)
>-        return;
>-
>-    m_renderPipelineState->setLabel(label);
>+    m_state.setLabel(label);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderPipelineState.h b/Source/WebCore/html/canvas/WebGPURenderPipelineState.h
>index 464c064563c5d3dede03b6292b1e679bbf980b14..f27dad8a834ce4ea0dfd669443707355b186a8fa 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderPipelineState.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderPipelineState.h
>@@ -27,29 +27,24 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPURenderPipelineState.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPURenderPipelineState;
>-class WebGPURenderPipelineDescriptor;
>-
> class WebGPURenderPipelineState : public WebGPUObject {
> public:
>-    virtual ~WebGPURenderPipelineState();
>-    static Ref<WebGPURenderPipelineState> create(WebGPURenderingContext*, WebGPURenderPipelineDescriptor*);
>+    static Ref<WebGPURenderPipelineState> create(WebGPURenderingContext&, const GPURenderPipelineDescriptor&);
> 
>     String label() const;
>     void setLabel(const String&);
> 
>-    GPURenderPipelineState* renderPipelineState() { return m_renderPipelineState.get(); }
>+    const GPURenderPipelineState& state() const { return m_state; }
> 
> private:
>-    WebGPURenderPipelineState(WebGPURenderingContext*, WebGPURenderPipelineDescriptor*);
>+    WebGPURenderPipelineState(WebGPURenderingContext&, const GPURenderPipelineDescriptor&);
> 
>-    RefPtr<GPURenderPipelineState> m_renderPipelineState;
>+    GPURenderPipelineState m_state;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderingContext.cpp b/Source/WebCore/html/canvas/WebGPURenderingContext.cpp
>index c161aa849ad336da4e9ec206af4526667f7d7fae..fe74779476b76ef2e99491e01375eb3882c00ec9 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderingContext.cpp
>+++ b/Source/WebCore/html/canvas/WebGPURenderingContext.cpp
>@@ -46,7 +46,6 @@
> #include "WebGPURenderPipelineState.h"
> #include "WebGPUTexture.h"
> #include "WebGPUTextureDescriptor.h"
>-
> #include <JavaScriptCore/ArrayBuffer.h>
> #include <JavaScriptCore/JSCInlines.h>
> #include <JavaScriptCore/TypedArrayInlines.h>
>@@ -71,17 +70,16 @@ namespace WebCore {
> 
> static const int kMaxTextureSize = 4096;
> 
>-
> std::unique_ptr<WebGPURenderingContext> WebGPURenderingContext::create(CanvasBase& canvas)
> {
>-    RefPtr<GPUDevice> device(GPUDevice::create());
>+    GPUDevice device;
> 
>     if (!device) {
>         // FIXME: WebGPU - dispatch an event here for the failure.
>         return nullptr;
>     }
> 
>-    auto renderingContext = std::unique_ptr<WebGPURenderingContext>(new WebGPURenderingContext(canvas, device.releaseNonNull()));
>+    auto renderingContext = std::unique_ptr<WebGPURenderingContext>(new WebGPURenderingContext(canvas, WTFMove(device)));
>     renderingContext->suspendIfNeeded();
> 
>     InspectorInstrumentation::didCreateCanvasRenderingContext(*renderingContext);
>@@ -89,7 +87,7 @@ std::unique_ptr<WebGPURenderingContext> WebGPURenderingContext::create(CanvasBas
>     return renderingContext;
> }
> 
>-WebGPURenderingContext::WebGPURenderingContext(CanvasBase& canvas, Ref<GPUDevice>&& device)
>+WebGPURenderingContext::WebGPURenderingContext(CanvasBase& canvas, GPUDevice&& device)
>     : GPUBasedCanvasRenderingContext(canvas)
>     , m_device(WTFMove(device))
> {
>@@ -109,7 +107,7 @@ void WebGPURenderingContext::initializeNewContext()
>     // FIXME: WebGPU - Maybe we should reset a bunch of stuff here.
> 
>     IntSize canvasSize = clampedCanvasSize();
>-    m_device->reshape(canvasSize.width(), canvasSize.height());
>+    m_device.reshape(canvasSize.width(), canvasSize.height());
> }
> 
> IntSize WebGPURenderingContext::clampedCanvasSize() const
>@@ -139,66 +137,58 @@ bool WebGPURenderingContext::canSuspendForDocumentSuspension() const
> 
> PlatformLayer* WebGPURenderingContext::platformLayer() const
> {
>-    return m_device->platformLayer();
>+    return m_device.platformLayer();
> }
> 
> void WebGPURenderingContext::markLayerComposited()
> {
>-    m_device->markLayerComposited();
>+    m_device.markLayerComposited();
> }
> 
> void WebGPURenderingContext::reshape(int width, int height)
> {
>     // FIXME: WebGPU - Do we need to reset stuff here?
>-    m_device->reshape(width, height);
>+    m_device.reshape(width, height);
> }
> 
>-RefPtr<WebGPULibrary> WebGPURenderingContext::createLibrary(const String sourceCode)
>+Ref<WebGPULibrary> WebGPURenderingContext::createLibrary(const String& sourceCode)
> {
>-    RefPtr<WebGPULibrary> library = WebGPULibrary::create(this, sourceCode);
>-    return library;
>+    return WebGPULibrary::create(*this, sourceCode);
> }
> 
>-RefPtr<WebGPURenderPipelineState> WebGPURenderingContext::createRenderPipelineState(WebGPURenderPipelineDescriptor& descriptor)
>+Ref<WebGPURenderPipelineState> WebGPURenderingContext::createRenderPipelineState(WebGPURenderPipelineDescriptor& descriptor)
> {
>-    RefPtr<WebGPURenderPipelineState> state = WebGPURenderPipelineState::create(this, &descriptor);
>-    return state;
>+    return WebGPURenderPipelineState::create(*this, descriptor.descriptor());
> }
> 
>-RefPtr<WebGPUDepthStencilState> WebGPURenderingContext::createDepthStencilState(WebGPUDepthStencilDescriptor& descriptor)
>+Ref<WebGPUDepthStencilState> WebGPURenderingContext::createDepthStencilState(WebGPUDepthStencilDescriptor& descriptor)
> {
>-    RefPtr<WebGPUDepthStencilState> state = WebGPUDepthStencilState::create(this, &descriptor);
>-    return state;
>+    return WebGPUDepthStencilState::create(*this, descriptor.descriptor());
> }
> 
>-RefPtr<WebGPUComputePipelineState> WebGPURenderingContext::createComputePipelineState(WebGPUFunction& function)
>+Ref<WebGPUComputePipelineState> WebGPURenderingContext::createComputePipelineState(WebGPUFunction& function)
> {
>-    RefPtr<WebGPUComputePipelineState> state = WebGPUComputePipelineState::create(this, &function);
>-    return state;
>+    return WebGPUComputePipelineState::create(*this, function.function());
> }
> 
>-RefPtr<WebGPUCommandQueue> WebGPURenderingContext::createCommandQueue()
>+Ref<WebGPUCommandQueue> WebGPURenderingContext::createCommandQueue()
> {
>-    RefPtr<WebGPUCommandQueue> queue = WebGPUCommandQueue::create(this);
>-    return queue;
>+    return WebGPUCommandQueue::create(*this);
> }
> 
>-RefPtr<WebGPUDrawable> WebGPURenderingContext::nextDrawable()
>+Ref<WebGPUDrawable> WebGPURenderingContext::nextDrawable()
> {
>-    RefPtr<WebGPUDrawable> drawable = WebGPUDrawable::create(this);
>-    return drawable;
>+    return WebGPUDrawable::create(*this);
> }
> 
>-RefPtr<WebGPUBuffer> WebGPURenderingContext::createBuffer(ArrayBufferView& data)
>+RefPtr<WebGPUBuffer> WebGPURenderingContext::createBuffer(JSC::ArrayBufferView& data)
> {
>-    RefPtr<WebGPUBuffer> buffer = WebGPUBuffer::create(this, &data);
>-    return buffer;
>+    return WebGPUBuffer::create(*this, data);
> }
> 
>-RefPtr<WebGPUTexture> WebGPURenderingContext::createTexture(WebGPUTextureDescriptor& descriptor)
>+Ref<WebGPUTexture> WebGPURenderingContext::createTexture(WebGPUTextureDescriptor& descriptor)
> {
>-    RefPtr<WebGPUTexture> texture = WebGPUTexture::create(this, &descriptor);
>-    return texture;
>+    return WebGPUTexture::create(*this, descriptor.descriptor());
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderingContext.h b/Source/WebCore/html/canvas/WebGPURenderingContext.h
>index 33cd166fded098ac81953dcac90d7fb9861f7637..75658045ced311315ed72c011cc1025e22dff50b 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderingContext.h
>+++ b/Source/WebCore/html/canvas/WebGPURenderingContext.h
>@@ -30,72 +30,62 @@
> 
> #include "GPUBasedCanvasRenderingContext.h"
> #include "GPUDevice.h"
>-#include <JavaScriptCore/ArrayBuffer.h>
>+
>+namespace JSC {
>+class ArrayBufferView;
>+}
> 
> namespace WebCore {
> 
>+class WebGPUBuffer;
> class WebGPUCommandQueue;
> class WebGPUComputePipelineState;
>+class WebGPUDepthStencilDescriptor;
>+class WebGPUDepthStencilState;
>+class WebGPUDrawable;
> class WebGPUFunction;
> class WebGPULibrary;
> class WebGPURenderPipelineDescriptor;
> class WebGPURenderPipelineState;
>-class WebGPUDepthStencilDescriptor;
>-class WebGPUDepthStencilState;
>-class WebGPURenderPassDescriptor;
>-class WebGPUDrawable;
>-class WebGPUBuffer;
> class WebGPUTexture;
> class WebGPUTextureDescriptor;
> 
>-class WebGPURenderingContext : public GPUBasedCanvasRenderingContext {
>+class WebGPURenderingContext final : public GPUBasedCanvasRenderingContext {
> public:
>     static std::unique_ptr<WebGPURenderingContext> create(CanvasBase&);
> 
>+    // FIXME: IDL file says this is not nullable, but this function can return null.
>     HTMLCanvasElement* canvas() const;
> 
>-    bool isWebGPU() const final { return true; }
>-
>-    void reshape(int width, int height) final;
>-
>-    void markLayerComposited() final;
>-
>-    PlatformLayer* platformLayer() const override;
>+    Ref<WebGPULibrary> createLibrary(const String&);
>+    Ref<WebGPURenderPipelineState> createRenderPipelineState(WebGPURenderPipelineDescriptor&);
>+    Ref<WebGPUDepthStencilState> createDepthStencilState(WebGPUDepthStencilDescriptor&);
>+    Ref<WebGPUComputePipelineState> createComputePipelineState(WebGPUFunction&);
>+    Ref<WebGPUCommandQueue> createCommandQueue();
>+    Ref<WebGPUDrawable> nextDrawable();
>+    RefPtr<WebGPUBuffer> createBuffer(JSC::ArrayBufferView&);
>+    Ref<WebGPUTexture> createTexture(WebGPUTextureDescriptor&);
> 
>-    RefPtr<GPUDevice> device() { return m_device; }
>+    const GPUDevice& device() const { return m_device; }
> 
>-    // WebGPU entry points
>-
>-    RefPtr<WebGPULibrary> createLibrary(const String);
>-
>-    RefPtr<WebGPURenderPipelineState> createRenderPipelineState(WebGPURenderPipelineDescriptor&);
>-
>-    RefPtr<WebGPUDepthStencilState> createDepthStencilState(WebGPUDepthStencilDescriptor&);
>-
>-    RefPtr<WebGPUComputePipelineState> createComputePipelineState(WebGPUFunction&);
>-
>-    RefPtr<WebGPUCommandQueue> createCommandQueue();
>-
>-    RefPtr<WebGPUDrawable> nextDrawable();
>-
>-    RefPtr<WebGPUBuffer> createBuffer(ArrayBufferView& data);
>-
>-    RefPtr<WebGPUTexture> createTexture(WebGPUTextureDescriptor&);
>+private:
>+    WebGPURenderingContext(CanvasBase&, GPUDevice&&);
> 
>-protected:
>-    // ActiveDOMObject
>-    bool hasPendingActivity() const override;
>-    void stop() override;
>-    const char* activeDOMObjectName() const override;
>-    bool canSuspendForDocumentSuspension() const override;
>+    bool hasPendingActivity() const final;
>+    void stop() final;
>+    const char* activeDOMObjectName() const final;
>+    bool canSuspendForDocumentSuspension() const final;
> 
>     IntSize clampedCanvasSize() const;
>     void initializeNewContext();
> 
>-private:
>-    WebGPURenderingContext(CanvasBase&, Ref<GPUDevice>&&);
>+    bool isWebGPU() const final { return true; }
>+
>+    void reshape(int width, int height) final;
>+    void markLayerComposited() final;
>+    PlatformLayer* platformLayer() const final;
> 
>-    RefPtr<GPUDevice> m_device;
>+    GPUDevice m_device;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPURenderingContext.idl b/Source/WebCore/html/canvas/WebGPURenderingContext.idl
>index 618ec041dd065109216bd138bcce77212cda75b7..f20454eb2e06dabd5cf9e0d4555e5c828ca23cee 100644
>--- a/Source/WebCore/html/canvas/WebGPURenderingContext.idl
>+++ b/Source/WebCore/html/canvas/WebGPURenderingContext.idl
>@@ -100,16 +100,16 @@
> 
>     WebGPULibrary createLibrary(DOMString sourceCode);
> 
>-    WebGPURenderPipelineState? createRenderPipelineState(WebGPURenderPipelineDescriptor descriptor);
>-    WebGPUDepthStencilState? createDepthStencilState(WebGPUDepthStencilDescriptor descriptor);
>-    WebGPUComputePipelineState? createComputePipelineState(WebGPUFunction function);
>+    WebGPURenderPipelineState createRenderPipelineState(WebGPURenderPipelineDescriptor descriptor);
>+    WebGPUDepthStencilState createDepthStencilState(WebGPUDepthStencilDescriptor descriptor);
>+    WebGPUComputePipelineState createComputePipelineState(WebGPUFunction function);
> 
>-    WebGPUCommandQueue? createCommandQueue();
>+    WebGPUCommandQueue createCommandQueue();
> 
>-    WebGPUDrawable? nextDrawable();
>+    WebGPUDrawable nextDrawable();
> 
>     WebGPUBuffer? createBuffer(ArrayBufferView data);
> 
>-    WebGPUTexture? createTexture(WebGPUTextureDescriptor descriptor);
>+    WebGPUTexture createTexture(WebGPUTextureDescriptor descriptor);
> 
> };
>diff --git a/Source/WebCore/html/canvas/WebGPUSize.h b/Source/WebCore/html/canvas/WebGPUSize.h
>index 4dd4ea374a30bae95fe11d0042e751bb3660666d..5c121c5d4fd0038fdf4b14bc964da027a0827194 100644
>--- a/Source/WebCore/html/canvas/WebGPUSize.h
>+++ b/Source/WebCore/html/canvas/WebGPUSize.h
>@@ -30,9 +30,9 @@
> namespace WebCore {
>     
> struct WebGPUSize {
>-    unsigned long width;
>-    unsigned long height;
>-    unsigned long depth;
>+    unsigned width;
>+    unsigned height;
>+    unsigned depth;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUTexture.cpp b/Source/WebCore/html/canvas/WebGPUTexture.cpp
>index 6588df8d80e367bb612046ab284dd1e5a0e066c7..9ec89f66aaad880fd6d60b3e47bf920ac40021b8 100644
>--- a/Source/WebCore/html/canvas/WebGPUTexture.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUTexture.cpp
>@@ -28,50 +28,30 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUTexture.h"
> #include "WebGPURenderingContext.h"
>-#include "WebGPUTextureDescriptor.h"
> 
> namespace WebCore {
> 
>-Ref<WebGPUTexture> WebGPUTexture::createFromDrawableTexture(WebGPURenderingContext* context, RefPtr<GPUTexture>&& drawableTexture)
>+Ref<WebGPUTexture> WebGPUTexture::createFromDrawableTexture(WebGPURenderingContext& context, GPUTexture&& texture)
> {
>-    return adoptRef(*new WebGPUTexture(context, WTFMove(drawableTexture)));
>+    return adoptRef(*new WebGPUTexture(context, WTFMove(texture)));
> }
> 
>-Ref<WebGPUTexture> WebGPUTexture::create(WebGPURenderingContext* context, WebGPUTextureDescriptor* descriptor)
>+Ref<WebGPUTexture> WebGPUTexture::create(WebGPURenderingContext& context, const GPUTextureDescriptor& descriptor)
> {
>     return adoptRef(*new WebGPUTexture(context, descriptor));
> }
> 
>-WebGPUTexture::WebGPUTexture(WebGPURenderingContext* context, RefPtr<GPUTexture>&& drawableTexture)
>-    : WebGPUObject(context)
>-    , m_texture(WTFMove(drawableTexture))
>+WebGPUTexture::WebGPUTexture(WebGPURenderingContext& context, GPUTexture&& texture)
>+    : WebGPUObject { &context }
>+    , m_texture { WTFMove(texture) }
> {
> }
> 
>-WebGPUTexture::WebGPUTexture(WebGPURenderingContext* context, WebGPUTextureDescriptor* descriptor)
>-    : WebGPUObject(context)
>+WebGPUTexture::WebGPUTexture(WebGPURenderingContext& context, const GPUTextureDescriptor& descriptor)
>+    : WebGPUObject { &context }
>+    , m_texture { context.device(), descriptor }
> {
>-    m_texture = context->device()->createTexture(descriptor->textureDescriptor());
>-}
>-
>-WebGPUTexture::~WebGPUTexture() = default;
>-
>-unsigned long WebGPUTexture::width() const
>-{
>-    if (!m_texture)
>-        return 0;
>-    
>-    return m_texture->width();
>-}
>-
>-unsigned long WebGPUTexture::height() const
>-{
>-    if (!m_texture)
>-        return 0;
>-
>-    return m_texture->height();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUTexture.h b/Source/WebCore/html/canvas/WebGPUTexture.h
>index 30f2e4d1cac8d3c0151f6275952cca2d17979af5..5740128b49e6e78a28d8cdb36e9d068778f8b06e 100644
>--- a/Source/WebCore/html/canvas/WebGPUTexture.h
>+++ b/Source/WebCore/html/canvas/WebGPUTexture.h
>@@ -27,29 +27,28 @@
> 
> #if ENABLE(WEBGPU)
> 
>+#include "GPUTexture.h"
> #include "WebGPUObject.h"
> 
> namespace WebCore {
> 
>-class GPUTexture;
>-class WebGPUTextureDescriptor;
>+class GPUTextureDescriptor;
> 
> class WebGPUTexture : public WebGPUObject {
> public:
>-    virtual ~WebGPUTexture();
>-    static Ref<WebGPUTexture> createFromDrawableTexture(WebGPURenderingContext*, RefPtr<GPUTexture>&&);
>-    static Ref<WebGPUTexture> create(WebGPURenderingContext*, WebGPUTextureDescriptor*);
>+    static Ref<WebGPUTexture> createFromDrawableTexture(WebGPURenderingContext&, GPUTexture&&);
>+    static Ref<WebGPUTexture> create(WebGPURenderingContext&, const GPUTextureDescriptor&);
> 
>-    unsigned long width() const;
>-    unsigned long height() const;
>+    unsigned width() const { return m_texture.width(); }
>+    unsigned height() const { return m_texture.height(); }
> 
>-    GPUTexture* texture() const { return m_texture.get(); }
>+    const GPUTexture& texture() const { return m_texture; }
> 
> private:
>-    WebGPUTexture(WebGPURenderingContext*, RefPtr<GPUTexture>&&);
>-    WebGPUTexture(WebGPURenderingContext*, WebGPUTextureDescriptor*);
>+    WebGPUTexture(WebGPURenderingContext&, GPUTexture&&);
>+    WebGPUTexture(WebGPURenderingContext&, const GPUTextureDescriptor&);
> 
>-    RefPtr<GPUTexture> m_texture;
>+    GPUTexture m_texture;
> };
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUTextureDescriptor.cpp b/Source/WebCore/html/canvas/WebGPUTextureDescriptor.cpp
>index f7a33c62fef2d051b08234a3d5c85a284c08d24f..b8d735be839be048f3637e330330e617ae5a62bc 100644
>--- a/Source/WebCore/html/canvas/WebGPUTextureDescriptor.cpp
>+++ b/Source/WebCore/html/canvas/WebGPUTextureDescriptor.cpp
>@@ -28,118 +28,76 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUTextureDescriptor.h"
>-#include "WebGPURenderingContext.h"
>-
> namespace WebCore {
> 
>-Ref<WebGPUTextureDescriptor> WebGPUTextureDescriptor::create(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped)
>+Ref<WebGPUTextureDescriptor> WebGPUTextureDescriptor::create(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped)
> {
>     return adoptRef(*new WebGPUTextureDescriptor(pixelFormat, width, height, mipmapped));
> }
> 
>-WebGPUTextureDescriptor::WebGPUTextureDescriptor(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped)
>-    : WebGPUObject()
>+WebGPUTextureDescriptor::WebGPUTextureDescriptor(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped)
>+    : m_descriptor { pixelFormat, width, height, mipmapped }
> {
>-    m_textureDescriptor = GPUTextureDescriptor::create(pixelFormat, width, height, mipmapped);
> }
> 
>-WebGPUTextureDescriptor::~WebGPUTextureDescriptor() = default;
>-
>-unsigned long WebGPUTextureDescriptor::width() const
>+unsigned WebGPUTextureDescriptor::width() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->width();
>+    return m_descriptor.width();
> }
> 
>-void WebGPUTextureDescriptor::setWidth(unsigned long width)
>+void WebGPUTextureDescriptor::setWidth(unsigned width)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-
>-    m_textureDescriptor->setWidth(width);
>+    m_descriptor.setWidth(width);
> }
> 
>-unsigned long WebGPUTextureDescriptor::height() const
>+unsigned WebGPUTextureDescriptor::height() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->height();
>+    return m_descriptor.height();
> }
> 
>-void WebGPUTextureDescriptor::setHeight(unsigned long height)
>+void WebGPUTextureDescriptor::setHeight(unsigned height)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-    
>-    m_textureDescriptor->setHeight(height);
>+    m_descriptor.setHeight(height);
> }
> 
>-unsigned long WebGPUTextureDescriptor::sampleCount() const
>+unsigned WebGPUTextureDescriptor::sampleCount() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->sampleCount();
>+    return m_descriptor.sampleCount();
> }
> 
>-void WebGPUTextureDescriptor::setSampleCount(unsigned long sampleCount)
>+void WebGPUTextureDescriptor::setSampleCount(unsigned sampleCount)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-    
>-    m_textureDescriptor->setSampleCount(sampleCount);
>+    m_descriptor.setSampleCount(sampleCount);
> }
> 
>-unsigned long WebGPUTextureDescriptor::textureType() const
>+unsigned WebGPUTextureDescriptor::textureType() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->textureType();
>+    return m_descriptor.textureType();
> }
> 
>-void WebGPUTextureDescriptor::setTextureType(unsigned long textureType)
>+void WebGPUTextureDescriptor::setTextureType(unsigned textureType)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-    
>-    m_textureDescriptor->setTextureType(textureType);
>+    m_descriptor.setTextureType(textureType);
> }
> 
>-unsigned long WebGPUTextureDescriptor::storageMode() const
>+unsigned WebGPUTextureDescriptor::storageMode() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->storageMode();
>+    return m_descriptor.storageMode();
> }
> 
>-void WebGPUTextureDescriptor::setStorageMode(unsigned long storageMode)
>+void WebGPUTextureDescriptor::setStorageMode(unsigned storageMode)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-    
>-    m_textureDescriptor->setStorageMode(storageMode);
>+    m_descriptor.setStorageMode(storageMode);
> }
> 
>-unsigned long WebGPUTextureDescriptor::usage() const
>+unsigned WebGPUTextureDescriptor::usage() const
> {
>-    if (!m_textureDescriptor)
>-        return 0;
>-
>-    return m_textureDescriptor->usage();
>+    return m_descriptor.usage();
> }
> 
>-void WebGPUTextureDescriptor::setUsage(unsigned long usage)
>+void WebGPUTextureDescriptor::setUsage(unsigned usage)
> {
>-    if (!m_textureDescriptor)
>-        return;
>-
>-    m_textureDescriptor->setUsage(usage);
>+    m_descriptor.setUsage(usage);
> }
>     
> } // namespace WebCore
>diff --git a/Source/WebCore/html/canvas/WebGPUTextureDescriptor.h b/Source/WebCore/html/canvas/WebGPUTextureDescriptor.h
>index 8ae264e61ad18ec0c6f0469902773d1540bbc41f..9b6b6c8b2b27a9f62371424631b6d168a878de8e 100644
>--- a/Source/WebCore/html/canvas/WebGPUTextureDescriptor.h
>+++ b/Source/WebCore/html/canvas/WebGPUTextureDescriptor.h
>@@ -27,44 +27,39 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "WebGPUEnums.h"
>+#include "GPUTextureDescriptor.h"
> #include "WebGPUObject.h"
> 
>-#include <wtf/Vector.h>
>-
> namespace WebCore {
> 
>-class GPUTextureDescriptor;
>-
> class WebGPUTextureDescriptor : public WebGPUObject {
> public:
>-    virtual ~WebGPUTextureDescriptor();
>-    static Ref<WebGPUTextureDescriptor> create(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped);
>+    static Ref<WebGPUTextureDescriptor> create(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped);
> 
>-    unsigned long width() const;
>-    void setWidth(unsigned long);
>+    unsigned width() const;
>+    void setWidth(unsigned);
> 
>-    unsigned long height() const;
>-    void setHeight(unsigned long);
>+    unsigned height() const;
>+    void setHeight(unsigned);
> 
>-    unsigned long sampleCount() const;
>-    void setSampleCount(unsigned long);
>+    unsigned sampleCount() const;
>+    void setSampleCount(unsigned);
> 
>-    unsigned long textureType() const;
>-    void setTextureType(unsigned long);
>+    unsigned textureType() const;
>+    void setTextureType(unsigned);
> 
>-    unsigned long storageMode() const;
>-    void setStorageMode(unsigned long);
>+    unsigned storageMode() const;
>+    void setStorageMode(unsigned);
> 
>-    unsigned long usage() const;
>-    void setUsage(unsigned long);
>+    unsigned usage() const;
>+    void setUsage(unsigned);
> 
>-    GPUTextureDescriptor* textureDescriptor() { return m_textureDescriptor.get(); }
>+    const GPUTextureDescriptor& descriptor() { return m_descriptor; }
> 
> private:
>-    WebGPUTextureDescriptor(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped);
>+    WebGPUTextureDescriptor(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped);
> 
>-    RefPtr<GPUTextureDescriptor> m_textureDescriptor;
>+    GPUTextureDescriptor m_descriptor;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUBufferMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUBufferMetal.mm
>deleted file mode 100644
>index ad46220b25a3fdd1e8566351f0f1ecf3ae11993e..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUBufferMetal.mm
>+++ /dev/null
>@@ -1,82 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUBuffer.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "Logging.h"
>-#import <Metal/Metal.h>
>-#import <wtf/Gigacage.h>
>-#import <wtf/PageBlock.h>
>-
>-namespace WebCore {
>-
>-GPUBuffer::GPUBuffer(GPUDevice* device, ArrayBufferView* data)
>-{
>-    LOG(WebGPU, "GPUBuffer::GPUBuffer()");
>-
>-    if (!device || !device->platformDevice() || !data)
>-        return;
>-    
>-    size_t pageSize = WTF::pageSize();
>-    size_t pageAlignedSize = roundUpToMultipleOf(pageSize, data->byteLength());
>-    void* pageAlignedCopy = Gigacage::tryAlignedMalloc(Gigacage::Primitive, pageSize, pageAlignedSize);
>-    if (!pageAlignedCopy)
>-        return;
>-    memcpy(pageAlignedCopy, data->baseAddress(), data->byteLength());
>-    m_contents = ArrayBuffer::createFromBytes(pageAlignedCopy, data->byteLength(), [] (void* ptr) { Gigacage::alignedFree(Gigacage::Primitive, ptr); });
>-    m_contents->ref();
>-    ArrayBuffer* capturedContents = m_contents.get();
>-    m_buffer = adoptNS((MTLBuffer *)[device->platformDevice() newBufferWithBytesNoCopy:m_contents->data() length:pageAlignedSize options:MTLResourceOptionCPUCacheModeDefault deallocator:^(void*, NSUInteger) { capturedContents->deref(); }]);
>-    if (!m_buffer) {
>-        m_contents->deref();
>-        m_contents = nullptr;
>-    }
>-}
>-
>-unsigned long GPUBuffer::length() const
>-{
>-    if (!m_buffer)
>-        return 0;
>-
>-    return m_contents->byteLength();
>-}
>-
>-RefPtr<ArrayBuffer> GPUBuffer::contents()
>-{
>-    return m_contents;
>-}
>-
>-MTLBuffer *GPUBuffer::platformBuffer()
>-{
>-    return m_buffer.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUCommandBufferMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUCommandBufferMetal.mm
>deleted file mode 100644
>index 12546f7ffa7d3a071a679ef3f9ec4cdf4d3b7d5e..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUCommandBufferMetal.mm
>+++ /dev/null
>@@ -1,89 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUCommandBuffer.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUCommandQueue.h"
>-#import "GPUDevice.h"
>-#import "GPUDrawable.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-#import <wtf/BlockPtr.h>
>-
>-namespace WebCore {
>-
>-GPUCommandBuffer::GPUCommandBuffer(GPUCommandQueue* queue)
>-{
>-    LOG(WebGPU, "GPUCommandBuffer::GPUCommandBuffer()");
>-
>-    if (!queue || !queue->platformCommandQueue())
>-        return;
>-
>-    m_commandBuffer = (MTLCommandBuffer *)[queue->platformCommandQueue() commandBuffer];
>-}
>-
>-MTLCommandBuffer *GPUCommandBuffer::platformCommandBuffer()
>-{
>-    return m_commandBuffer.get();
>-}
>-
>-void GPUCommandBuffer::presentDrawable(GPUDrawable* drawable)
>-{
>-    if (!m_commandBuffer || !drawable->platformDrawable())
>-        return;
>-
>-    [m_commandBuffer presentDrawable:static_cast<id<MTLDrawable>>(drawable->platformDrawable())];
>-    drawable->release();
>-}
>-
>-void GPUCommandBuffer::commit()
>-{
>-    if (!m_commandBuffer)
>-        return;
>-
>-    [m_commandBuffer commit];
>-}
>-
>-DOMPromiseProxy<IDLVoid>& GPUCommandBuffer::completed()
>-{
>-    if (!m_commandBuffer)
>-        return m_completedPromise;
>-
>-    [m_commandBuffer addCompletedHandler:BlockPtr<void (id<MTLCommandBuffer>)>::fromCallable([this, protectedThis = makeRef(*this)] (id<MTLCommandBuffer>) {
>-        callOnMainThread([this, protectedThis = makeRef(*this)] {
>-            this->m_completedPromise.resolve();
>-        });
>-    }).get()];
>-    
>-    return m_completedPromise;
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUCommandQueueMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUCommandQueueMetal.mm
>deleted file mode 100644
>index a9aa4aa804867e44bb1adf91f87b2dae4b1d9554..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUCommandQueueMetal.mm
>+++ /dev/null
>@@ -1,81 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUCommandQueue.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-static NSString *webkitPrefix = @"com.apple.WebKit";
>-
>-namespace WebCore {
>-
>-GPUCommandQueue::GPUCommandQueue(GPUDevice* device)
>-{
>-    LOG(WebGPU, "GPUCommandQueue::GPUCommandQueue()");
>-
>-    if (!device || !device->platformDevice())
>-        return;
>-
>-    m_commandQueue = adoptNS((MTLCommandQueue *)[device->platformDevice() newCommandQueue]);
>-    setLabel(emptyString());
>-}
>-
>-String GPUCommandQueue::label() const
>-{
>-    if (!m_commandQueue)
>-        return emptyString();
>-
>-    NSString *prefixedLabel = [m_commandQueue label];
>-
>-    if ([prefixedLabel isEqualToString:webkitPrefix])
>-        return emptyString();
>-
>-    ASSERT(prefixedLabel.length >= (webkitPrefix.length + 1));
>-    return [prefixedLabel substringFromIndex:(webkitPrefix.length + 1)];
>-}
>-
>-void GPUCommandQueue::setLabel(const String& label)
>-{
>-    ASSERT(m_commandQueue);
>-    if (label.isEmpty())
>-        [m_commandQueue setLabel:webkitPrefix];
>-    else
>-        [m_commandQueue setLabel:[NSString stringWithFormat:@"%@.%@", webkitPrefix, static_cast<NSString *>(label)]];
>-}
>-    
>-MTLCommandQueue *GPUCommandQueue::platformCommandQueue()
>-{
>-    return m_commandQueue.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUComputeCommandEncoderMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUComputeCommandEncoderMetal.mm
>deleted file mode 100644
>index c0c187149542450510f88fa11dfe50382b03a468..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUComputeCommandEncoderMetal.mm
>+++ /dev/null
>@@ -1,92 +0,0 @@
>-/*
>- * Copyright (C) 2017 Yuichiro Kikura (y.kikura@gmail.com)
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUComputeCommandEncoder.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUBuffer.h"
>-#import "GPUCommandBuffer.h"
>-#import "GPUComputePipelineState.h"
>-#import "GPUSize.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-    
>-inline MTLSize MTLSizeMake(GPUSize size)
>-{
>-    return {size.width, size.height, size.depth};
>-}
>-    
>-GPUComputeCommandEncoder::GPUComputeCommandEncoder(GPUCommandBuffer* buffer)
>-{
>-    LOG(WebGPU, "GPUComputeCommandEncoder::GPUComputeCommandEncoder()");
>-
>-    if (!buffer || !buffer->platformCommandBuffer())
>-        return;
>-
>-    m_computeCommandEncoder = (MTLComputeCommandEncoder *)[buffer->platformCommandBuffer() computeCommandEncoder];
>-}
>-    
>-void GPUComputeCommandEncoder::setComputePipelineState(GPUComputePipelineState* computePipelineState)
>-{
>-    if (!m_computeCommandEncoder || !computePipelineState)
>-        return;
>-    
>-    [m_computeCommandEncoder setComputePipelineState:static_cast<id<MTLComputePipelineState>>(computePipelineState->platformComputePipelineState())];
>-}
>-    
>-void GPUComputeCommandEncoder::setBuffer(GPUBuffer* buffer, unsigned offset, unsigned index)
>-{
>-    if (!m_computeCommandEncoder || !buffer)
>-        return;
>-    
>-    [m_computeCommandEncoder setBuffer:static_cast<id<MTLBuffer>>(buffer->platformBuffer()) offset:offset atIndex:index];
>-}
>-    
>-void GPUComputeCommandEncoder::dispatch(GPUSize threadgroupsPerGrid, GPUSize threadsPerThreadgroup)
>-{
>-    if (!m_computeCommandEncoder)
>-        return;
>-    
>-    [m_computeCommandEncoder dispatchThreadgroups:MTLSizeMake(threadgroupsPerGrid) threadsPerThreadgroup:MTLSizeMake(threadsPerThreadgroup)];
>-}
>-
>-void GPUComputeCommandEncoder::endEncoding()
>-{
>-    [m_computeCommandEncoder endEncoding];
>-}
>-    
>-MTLComputeCommandEncoder *GPUComputeCommandEncoder::platformComputeCommandEncoder()
>-{
>-    return m_computeCommandEncoder.get();
>-}
>-    
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUComputePipelineStateMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUComputePipelineStateMetal.mm
>deleted file mode 100644
>index bd7ab6849c9a4e1d4710205af3f5ab5efb759cba..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUComputePipelineStateMetal.mm
>+++ /dev/null
>@@ -1,56 +0,0 @@
>-/*
>- * Copyright (C) 2017 Yuichiro Kikura (y.kikura@gmail.com)
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUComputePipelineState.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "GPUFunction.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUComputePipelineState::GPUComputePipelineState(GPUDevice* device, GPUFunction* function)
>-{
>-    LOG(WebGPU, "GPUComputePipelineState::GPUComputePipelineState()");
>-
>-    if (!device || !device->platformDevice() || !function || !function->platformFunction())
>-        return;
>-
>-    m_computePipelineState = adoptNS((MTLComputePipelineState *)[device->platformDevice() newComputePipelineStateWithFunction:(id<MTLFunction>)function->platformFunction() error:nil]);
>-}
>-
>-MTLComputePipelineState *GPUComputePipelineState::platformComputePipelineState()
>-{
>-    return m_computePipelineState.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilDescriptorMetal.mm
>deleted file mode 100644
>index 2fd814612832d84be68c253f7c7bf34cb5dedc0d..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilDescriptorMetal.mm
>+++ /dev/null
>@@ -1,80 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUDepthStencilDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUEnums.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUDepthStencilDescriptor::GPUDepthStencilDescriptor()
>-{
>-    LOG(WebGPU, "GPUDepthStencilDescriptor::GPUDepthStencilDescriptor()");
>-
>-    m_depthStencilDescriptor = adoptNS((MTLDepthStencilDescriptor *)[MTLDepthStencilDescriptor new]);
>-}
>-
>-bool GPUDepthStencilDescriptor::depthWriteEnabled() const
>-{
>-    if (!m_depthStencilDescriptor)
>-        return false;
>-
>-    return [m_depthStencilDescriptor isDepthWriteEnabled];
>-}
>-
>-void GPUDepthStencilDescriptor::setDepthWriteEnabled(bool newDepthWriteEnabled)
>-{
>-    ASSERT(m_depthStencilDescriptor);
>-    [m_depthStencilDescriptor setDepthWriteEnabled:newDepthWriteEnabled];
>-}
>-
>-GPUCompareFunction GPUDepthStencilDescriptor::depthCompareFunction() const
>-{
>-    if (!m_depthStencilDescriptor)
>-        return GPUCompareFunction::Never;
>-
>-    return static_cast<GPUCompareFunction>([m_depthStencilDescriptor depthCompareFunction]);
>-}
>-
>-void GPUDepthStencilDescriptor::setDepthCompareFunction(GPUCompareFunction newFunction)
>-{
>-    ASSERT(m_depthStencilDescriptor);
>-    [m_depthStencilDescriptor setDepthCompareFunction:static_cast<MTLCompareFunction>(newFunction)];
>-}
>-
>-MTLDepthStencilDescriptor *GPUDepthStencilDescriptor::platformDepthStencilDescriptor()
>-{
>-    return m_depthStencilDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilStateMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilStateMetal.mm
>deleted file mode 100644
>index 203e8617f220fe71de2d393bc574f7f97da5405f..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUDepthStencilStateMetal.mm
>+++ /dev/null
>@@ -1,70 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUDepthStencilState.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDepthStencilDescriptor.h"
>-#import "GPUDevice.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUDepthStencilState::GPUDepthStencilState(GPUDevice* device, GPUDepthStencilDescriptor* descriptor)
>-{
>-    LOG(WebGPU, "GPUDepthStencilState::GPUDepthStencilState()");
>-
>-    if (!device || !device->platformDevice() || !descriptor || !descriptor->platformDepthStencilDescriptor())
>-        return;
>-
>-    m_depthStencilState = adoptNS((MTLDepthStencilState *)[device->platformDevice() newDepthStencilStateWithDescriptor:descriptor->platformDepthStencilDescriptor()]);
>-}
>-
>-String GPUDepthStencilState::label() const
>-{
>-    if (!m_depthStencilState)
>-        return emptyString();
>-
>-    return [m_depthStencilState label];
>-}
>-
>-void GPUDepthStencilState::setLabel(const String& label)
>-{
>-    ASSERT(m_depthStencilState);
>-    [m_depthStencilState setLabel:label];
>-}
>-    
>-MTLDepthStencilState *GPUDepthStencilState::platformDepthStencilState()
>-{
>-    return m_depthStencilState.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUDeviceMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUDeviceMetal.mm
>deleted file mode 100644
>index f9ce8c529d83e5bbdb713b11e991411306619bee..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUDeviceMetal.mm
>+++ /dev/null
>@@ -1,83 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUDevice.h"
>-
>-#import "Logging.h"
>-#import "WebGPULayer.h"
>-
>-#import <JavaScriptCore/ArrayBuffer.h>
>-#import <Metal/Metal.h>
>-#import <wtf/BlockObjCExceptions.h>
>-
>-#if ENABLE(WEBGPU)
>-
>-namespace WebCore {
>-
>-GPUDevice::GPUDevice()
>-{
>-    m_device = MTLCreateSystemDefaultDevice();
>-
>-    if (!m_device) {
>-        LOG(WebGPU, "GPUDevice::GPUDevice -- could not create the device. This usually means Metal is not available on this hardware.");
>-        return;
>-    }
>-
>-    LOG(WebGPU, "GPUDevice::GPUDevice Metal device is %p", m_device.get());
>-
>-    BEGIN_BLOCK_OBJC_EXCEPTIONS
>-    m_layer = [[WebGPULayer alloc] initWithGPUDevice:this];
>-    [m_layer setOpaque:0];
>-    [m_layer setName:@"WebGPU Layer"];
>-
>-    // FIXME: WebGPU - Should this be in the WebGPULayer initializer?
>-    [m_layer setDevice:(id<MTLDevice>)m_device.get()];
>-    [m_layer setPixelFormat:MTLPixelFormatBGRA8Unorm];
>-    [m_layer setFramebufferOnly:YES];
>-    END_BLOCK_OBJC_EXCEPTIONS
>-}
>-
>-void GPUDevice::reshape(int width, int height)
>-{
>-    if (!m_device)
>-        return;
>-
>-    if (m_layer) {
>-        [m_layer setBounds:CGRectMake(0, 0, width, height)];
>-        [m_layer setDrawableSize:CGSizeMake(width, height)];
>-    }
>-
>-    // FIXME: WebGPU - Lots of reshape stuff should go here. See GC3D.
>-}
>-
>-id GPUDevice::platformDevice()
>-{
>-    return m_device.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUDrawableMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUDrawableMetal.mm
>deleted file mode 100644
>index 425e59ffa779b1a47a3c188d160ad43659958693..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUDrawableMetal.mm
>+++ /dev/null
>@@ -1,69 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUDrawable.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-#import <QuartzCore/QuartzCore.h>
>-
>-namespace WebCore {
>-
>-GPUDrawable::GPUDrawable(GPUDevice* device)
>-{
>-    LOG(WebGPU, "GPUDrawable::GPUDrawable()");
>-
>-    if (!device || !device->platformDevice())
>-        return;
>-
>-    m_drawable = (MTLDrawable *)[static_cast<CAMetalLayer*>(device->platformLayer()) nextDrawable];
>-}
>-
>-void GPUDrawable::release()
>-{
>-    LOG(WebGPU, "GPUDrawable::release()");
>-    m_drawable = nullptr;
>-}
>-    
>-MTLDrawable *GPUDrawable::platformDrawable()
>-{
>-    return m_drawable.get();
>-}
>-
>-MTLTexture *GPUDrawable::platformTexture()
>-{
>-    if (!m_drawable)
>-        return nullptr;
>-    return (MTLTexture *)[(id<CAMetalDrawable>)m_drawable.get() texture];
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUFunctionMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUFunctionMetal.mm
>deleted file mode 100644
>index 19dbbf6cee019084b356b43dfa88d3c0170d6950..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUFunctionMetal.mm
>+++ /dev/null
>@@ -1,62 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUFunction.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPULibrary.h"
>-#import "Logging.h"
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUFunction::GPUFunction(GPULibrary* library, const String& name)
>-{
>-    LOG(WebGPU, "GPUFunction::GPUFunction()");
>-
>-    if (!library || !library->platformLibrary())
>-        return;
>-
>-    m_function = adoptNS((MTLFunction *)[library->platformLibrary() newFunctionWithName:name]);
>-}
>-
>-String GPUFunction::name() const
>-{
>-    if (!m_function)
>-        return emptyString();
>-    
>-    return [m_function name];
>-}
>-
>-MTLFunction *GPUFunction::platformFunction()
>-{
>-    return m_function.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPULibraryMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPULibraryMetal.mm
>deleted file mode 100644
>index fb8f8249e82edf6b81f61e11df14157e456e94a5..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPULibraryMetal.mm
>+++ /dev/null
>@@ -1,86 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPULibrary.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPULibrary::GPULibrary(GPUDevice* device, const String& sourceCode)
>-{
>-    LOG(WebGPU, "GPULibrary::GPULibrary()");
>-
>-    if (!device || !device->platformDevice())
>-        return;
>-
>-    NSError *error = [NSError errorWithDomain:@"com.apple.WebKit.GPU" code:1 userInfo:nil];
>-    m_library = adoptNS((MTLLibrary *)[device->platformDevice() newLibraryWithSource:sourceCode options:nil error:&error]);
>-    if (!m_library)
>-        LOG(WebGPU, "Compilation error: %s", [[error localizedDescription] UTF8String]);
>-}
>-
>-String GPULibrary::label() const
>-{
>-    if (!m_library)
>-        return emptyString();
>-
>-    return [m_library label];
>-}
>-
>-void GPULibrary::setLabel(const String& label)
>-{
>-    ASSERT(m_library);
>-    [m_library setLabel:label];
>-}
>-
>-Vector<String> GPULibrary::functionNames()
>-{
>-    if (!m_library)
>-        return Vector<String>();
>-
>-    Vector<String> names;
>-
>-    NSArray<NSString*> *functionNames = [m_library functionNames];
>-    for (NSString *string in functionNames)
>-        names.append(string);
>-    
>-    return names;
>-}
>-
>-MTLLibrary *GPULibrary::platformLibrary()
>-{
>-    return m_library.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderCommandEncoderMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderCommandEncoderMetal.mm
>deleted file mode 100644
>index 23cb1aab3e8970e6fcfeae40327984d36cc6bf2b..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderCommandEncoderMetal.mm
>+++ /dev/null
>@@ -1,106 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderCommandEncoder.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUBuffer.h"
>-#import "GPUCommandBuffer.h"
>-#import "GPUDepthStencilState.h"
>-#import "GPURenderPassDescriptor.h"
>-#import "GPURenderPipelineState.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPURenderCommandEncoder::GPURenderCommandEncoder(GPUCommandBuffer* buffer, GPURenderPassDescriptor* descriptor)
>-{
>-    LOG(WebGPU, "GPURenderCommandEncoder::GPURenderCommandEncoder()");
>-
>-    if (!buffer || !buffer->platformCommandBuffer() || !descriptor || !descriptor->platformRenderPassDescriptor())
>-        return;
>-
>-    m_renderCommandEncoder = (MTLRenderCommandEncoder *)[buffer->platformCommandBuffer() renderCommandEncoderWithDescriptor:descriptor->platformRenderPassDescriptor()];
>-}
>-
>-void GPURenderCommandEncoder::setRenderPipelineState(GPURenderPipelineState* renderPipelineState)
>-{
>-    if (!m_renderCommandEncoder || !renderPipelineState)
>-        return;
>-
>-    // We need to cast to MTLRenderCommandEncoder explicitly because the compiler gets
>-    // confused by a protocol with a similar signature.
>-    [(id<MTLRenderCommandEncoder>)m_renderCommandEncoder.get() setRenderPipelineState:static_cast<id<MTLRenderPipelineState>>(renderPipelineState->platformRenderPipelineState())];
>-}
>-
>-void GPURenderCommandEncoder::setDepthStencilState(GPUDepthStencilState* depthStencilState)
>-{
>-    if (!m_renderCommandEncoder || !depthStencilState)
>-        return;
>-
>-    [m_renderCommandEncoder setDepthStencilState:static_cast<id<MTLDepthStencilState>>(depthStencilState->platformDepthStencilState())];
>-}
>-
>-void GPURenderCommandEncoder::setVertexBuffer(GPUBuffer* buffer, unsigned offset, unsigned index)
>-{
>-    if (!m_renderCommandEncoder || !buffer)
>-        return;
>-
>-    [m_renderCommandEncoder setVertexBuffer:static_cast<id<MTLBuffer>>(buffer->platformBuffer()) offset:offset atIndex:index];
>-}
>-
>-void GPURenderCommandEncoder::setFragmentBuffer(GPUBuffer* buffer, unsigned offset, unsigned index)
>-{
>-    if (!m_renderCommandEncoder || !buffer)
>-        return;
>-
>-    [m_renderCommandEncoder setFragmentBuffer:static_cast<id<MTLBuffer>>(buffer->platformBuffer()) offset:offset atIndex:index];
>-}
>-
>-void GPURenderCommandEncoder::drawPrimitives(unsigned type, unsigned start, unsigned count)
>-{
>-    if (!m_renderCommandEncoder || !count)
>-        return;
>-
>-    [m_renderCommandEncoder drawPrimitives:static_cast<MTLPrimitiveType>(type) vertexStart:start vertexCount:count];
>-}
>-
>-void GPURenderCommandEncoder::endEncoding()
>-{
>-    [m_renderCommandEncoder endEncoding];
>-}
>-
>-MTLRenderCommandEncoder *GPURenderCommandEncoder::platformRenderCommandEncoder()
>-{
>-    return m_renderCommandEncoder.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPassAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPassAttachmentDescriptorMetal.mm
>deleted file mode 100644
>index 3c712c99feb4bcaa362a3797be1931b28d7a4262..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPassAttachmentDescriptorMetal.mm
>+++ /dev/null
>@@ -1,92 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPassAttachmentDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUTexture.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor(MTLRenderPassAttachmentDescriptor *attachmentDescriptor)
>-{
>-    LOG(WebGPU, "GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor()");
>-
>-    m_renderPassAttachmentDescriptor = attachmentDescriptor;
>-}
>-
>-unsigned long GPURenderPassAttachmentDescriptor::loadAction() const
>-{
>-    if (!m_renderPassAttachmentDescriptor)
>-        return 0; // FIXME: WebGPU - There is probably a real value for this.
>-
>-    return [m_renderPassAttachmentDescriptor loadAction];
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setLoadAction(unsigned long newLoadAction)
>-{
>-    if (!m_renderPassAttachmentDescriptor)
>-        return;
>-
>-    [m_renderPassAttachmentDescriptor setLoadAction:static_cast<MTLLoadAction>(newLoadAction)];
>-}
>-
>-unsigned long GPURenderPassAttachmentDescriptor::storeAction() const
>-{
>-    if (!m_renderPassAttachmentDescriptor)
>-        return 0; // FIXME: WebGPU - There is probably a real value for this.
>-
>-    return [m_renderPassAttachmentDescriptor storeAction];
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setStoreAction(unsigned long newStoreAction)
>-{
>-    if (!m_renderPassAttachmentDescriptor)
>-        return;
>-
>-    [m_renderPassAttachmentDescriptor setStoreAction:static_cast<MTLStoreAction>(newStoreAction)];
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setTexture(RefPtr<GPUTexture> texture)
>-{
>-    if (!m_renderPassAttachmentDescriptor)
>-        return;
>-    
>-    [m_renderPassAttachmentDescriptor setTexture:static_cast<id<MTLTexture>>(texture->platformTexture())];
>-}
>-
>-MTLRenderPassAttachmentDescriptor *GPURenderPassAttachmentDescriptor::platformRenderPassAttachmentDescriptor()
>-{
>-    return m_renderPassAttachmentDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPassColorAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPassColorAttachmentDescriptorMetal.mm
>deleted file mode 100644
>index 592cf652ad51f4f4a7a345ada9d2085f4e0c62de..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPassColorAttachmentDescriptorMetal.mm
>+++ /dev/null
>@@ -1,77 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPassColorAttachmentDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPURenderPassAttachmentDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-RefPtr<GPURenderPassColorAttachmentDescriptor> GPURenderPassColorAttachmentDescriptor::create(MTLRenderPassColorAttachmentDescriptor *colorAttachmentDescriptor)
>-{
>-    RefPtr<GPURenderPassColorAttachmentDescriptor> descriptor = adoptRef(new GPURenderPassColorAttachmentDescriptor(colorAttachmentDescriptor));
>-    return descriptor;
>-}
>-
>-GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor(MTLRenderPassColorAttachmentDescriptor *attachmentDescriptor)
>-    : GPURenderPassAttachmentDescriptor(attachmentDescriptor)
>-{
>-    LOG(WebGPU, "GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor()");
>-}
>-
>-Vector<float> GPURenderPassColorAttachmentDescriptor::clearColor() const
>-{
>-    MTLRenderPassColorAttachmentDescriptor *colorAttachmentDescriptor = static_cast<MTLRenderPassColorAttachmentDescriptor *>(m_renderPassAttachmentDescriptor.get());
>-    if (!colorAttachmentDescriptor)
>-        return Vector<float>();
>-
>-    MTLClearColor color = [colorAttachmentDescriptor clearColor];
>-    return Vector<float>({static_cast<float>(color.red), static_cast<float>(color.green), static_cast<float>(color.blue), static_cast<float>(color.alpha)});
>-}
>-
>-void GPURenderPassColorAttachmentDescriptor::setClearColor(const Vector<float>& newClearColor)
>-{
>-    MTLRenderPassColorAttachmentDescriptor *colorAttachmentDescriptor = platformRenderPassColorAttachmentDescriptor();
>-    if (!colorAttachmentDescriptor || newClearColor.size() != 4)
>-        return;
>-
>-    MTLClearColor clearColor = MTLClearColorMake(newClearColor[0], newClearColor[1], newClearColor[2], newClearColor[3]);
>-    [colorAttachmentDescriptor setClearColor:clearColor];
>-}
>-
>-MTLRenderPassColorAttachmentDescriptor *GPURenderPassColorAttachmentDescriptor::platformRenderPassColorAttachmentDescriptor()
>-{
>-    return static_cast<MTLRenderPassColorAttachmentDescriptor *>(platformRenderPassAttachmentDescriptor());
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPassDepthAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPassDepthAttachmentDescriptorMetal.mm
>deleted file mode 100644
>index 582d891e99323caf9aae147510d3ad0fecfb64c8..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPassDepthAttachmentDescriptorMetal.mm
>+++ /dev/null
>@@ -1,72 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPassDepthAttachmentDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPURenderPassAttachmentDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-RefPtr<GPURenderPassDepthAttachmentDescriptor> GPURenderPassDepthAttachmentDescriptor::create(MTLRenderPassDepthAttachmentDescriptor *depthAttachmentDescriptor)
>-{
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> descriptor = adoptRef(new GPURenderPassDepthAttachmentDescriptor(depthAttachmentDescriptor));
>-    return descriptor;
>-}
>-
>-GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor(MTLRenderPassDepthAttachmentDescriptor *attachmentDescriptor)
>-    : GPURenderPassAttachmentDescriptor(attachmentDescriptor)
>-{
>-    LOG(WebGPU, "GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor()");
>-}
>-
>-double GPURenderPassDepthAttachmentDescriptor::clearDepth() const
>-{
>-    MTLRenderPassDepthAttachmentDescriptor *depthAttachmentDescriptor = static_cast<MTLRenderPassDepthAttachmentDescriptor *>(m_renderPassAttachmentDescriptor.get());
>-    if (!depthAttachmentDescriptor)
>-        return 0;
>-
>-    return [depthAttachmentDescriptor clearDepth];
>-}
>-
>-void GPURenderPassDepthAttachmentDescriptor::setClearDepth(double newClearDepth)
>-{
>-    MTLRenderPassDepthAttachmentDescriptor *depthAttachmentDescriptor = platformRenderPassDepthAttachmentDescriptor();
>-    [depthAttachmentDescriptor setClearDepth:newClearDepth];
>-}
>-
>-MTLRenderPassDepthAttachmentDescriptor *GPURenderPassDepthAttachmentDescriptor::platformRenderPassDepthAttachmentDescriptor()
>-{
>-    return static_cast<MTLRenderPassDepthAttachmentDescriptor *>(platformRenderPassAttachmentDescriptor());
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPassDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPassDescriptorMetal.mm
>deleted file mode 100644
>index 97983eb04029f4e47c0ac53af42f18c611a4cae6..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPassDescriptorMetal.mm
>+++ /dev/null
>@@ -1,74 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPassDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPURenderPassColorAttachmentDescriptor.h"
>-#import "GPURenderPassDepthAttachmentDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPURenderPassDescriptor::GPURenderPassDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPassDescriptor::GPURenderPassDescriptor()");
>-
>-    m_renderPassDescriptor = adoptNS((MTLRenderPassDescriptor *)[MTLRenderPassDescriptor new]);
>-}
>-
>-Vector<RefPtr<GPURenderPassColorAttachmentDescriptor>> GPURenderPassDescriptor::colorAttachments()
>-{
>-    if (!m_renderPassDescriptor)
>-        return Vector<RefPtr<GPURenderPassColorAttachmentDescriptor>>();
>-
>-    Vector<RefPtr<GPURenderPassColorAttachmentDescriptor>> platformColorAttachments;
>-    platformColorAttachments.append(GPURenderPassColorAttachmentDescriptor::create([[m_renderPassDescriptor colorAttachments] objectAtIndexedSubscript:0]));
>-    return platformColorAttachments;
>-}
>-
>-RefPtr<GPURenderPassDepthAttachmentDescriptor> GPURenderPassDescriptor::depthAttachment()
>-{
>-    if (!m_renderPassDescriptor)
>-        return nullptr;
>-
>-    if (!m_depthAttachment)
>-        m_depthAttachment = GPURenderPassDepthAttachmentDescriptor::create([m_renderPassDescriptor depthAttachment]);
>-    
>-    return m_depthAttachment;
>-}
>-
>-MTLRenderPassDescriptor *GPURenderPassDescriptor::platformRenderPassDescriptor()
>-{
>-    return m_renderPassDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineColorAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>deleted file mode 100644
>index 06627f6f446db6969de23313f375cdce133e4500..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>+++ /dev/null
>@@ -1,71 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPipelineColorAttachmentDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-RefPtr<GPURenderPipelineColorAttachmentDescriptor> GPURenderPipelineColorAttachmentDescriptor::create(MTLRenderPipelineColorAttachmentDescriptor *attachmentDescriptor)
>-{
>-    RefPtr<GPURenderPipelineColorAttachmentDescriptor> descriptor = adoptRef(new GPURenderPipelineColorAttachmentDescriptor(attachmentDescriptor));
>-    return descriptor;
>-}
>-
>-GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor(MTLRenderPipelineColorAttachmentDescriptor *attachmentDescriptor)
>-{
>-    LOG(WebGPU, "GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor()");
>-
>-    m_renderPipelineColorAttachmentDescriptor = attachmentDescriptor;
>-}
>-
>-unsigned long GPURenderPipelineColorAttachmentDescriptor::pixelFormat() const
>-{
>-    if (!m_renderPipelineColorAttachmentDescriptor)
>-        return 0; // FIXME: WebGPU - There is probably a real value for this.
>-
>-    return [m_renderPipelineColorAttachmentDescriptor pixelFormat];
>-}
>-
>-void GPURenderPipelineColorAttachmentDescriptor::setPixelFormat(unsigned long newPixelFormat)
>-{
>-    ASSERT(m_renderPipelineColorAttachmentDescriptor);
>-    [m_renderPipelineColorAttachmentDescriptor setPixelFormat:static_cast<MTLPixelFormat>(newPixelFormat)];
>-}
>-
>-MTLRenderPipelineColorAttachmentDescriptor *GPURenderPipelineColorAttachmentDescriptor::platformRenderPipelineColorAttachmentDescriptor()
>-{
>-    return m_renderPipelineColorAttachmentDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineDescriptorMetal.mm
>deleted file mode 100644
>index 1e0b637270f7071e3f04d7978b4fa0acc702a803..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineDescriptorMetal.mm
>+++ /dev/null
>@@ -1,96 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPipelineDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUFunction.h"
>-#import "GPURenderPipelineColorAttachmentDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPURenderPipelineDescriptor::GPURenderPipelineDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPipelineDescriptor::GPURenderPipelineDescriptor()");
>-
>-    m_renderPipelineDescriptor = adoptNS((MTLRenderPipelineDescriptor *)[MTLRenderPipelineDescriptor new]);
>-}
>-
>-unsigned long GPURenderPipelineDescriptor::depthAttachmentPixelFormat() const
>-{
>-    if (!m_renderPipelineDescriptor)
>-        return 0;
>-    return [m_renderPipelineDescriptor depthAttachmentPixelFormat];
>-}
>-
>-void GPURenderPipelineDescriptor::setDepthAttachmentPixelFormat(unsigned long newPixelFormat)
>-{
>-    ASSERT(m_renderPipelineDescriptor);
>-    [m_renderPipelineDescriptor setDepthAttachmentPixelFormat:static_cast<MTLPixelFormat>(newPixelFormat)];
>-}
>-
>-void GPURenderPipelineDescriptor::setVertexFunction(RefPtr<GPUFunction> newFunction)
>-{
>-    ASSERT(m_renderPipelineDescriptor);
>-    [m_renderPipelineDescriptor setVertexFunction:(id<MTLFunction>)newFunction->platformFunction()];
>-}
>-
>-void GPURenderPipelineDescriptor::setFragmentFunction(RefPtr<GPUFunction> newFunction)
>-{
>-    ASSERT(m_renderPipelineDescriptor);
>-    [m_renderPipelineDescriptor setFragmentFunction:(id<MTLFunction>)newFunction->platformFunction()];
>-}
>-
>-Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>> GPURenderPipelineDescriptor::colorAttachments()
>-{
>-    if (!m_renderPipelineDescriptor)
>-        return Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>>();
>-
>-    Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>> platformColorAttachments;
>-    platformColorAttachments.append(GPURenderPipelineColorAttachmentDescriptor::create([[m_renderPipelineDescriptor colorAttachments] objectAtIndexedSubscript:0]));
>-    return platformColorAttachments;
>-}
>-
>-void GPURenderPipelineDescriptor::reset()
>-{
>-    if (!m_renderPipelineDescriptor)
>-        return;
>-
>-    [m_renderPipelineDescriptor reset];
>-}
>-
>-MTLRenderPipelineDescriptor *GPURenderPipelineDescriptor::platformRenderPipelineDescriptor()
>-{
>-    return m_renderPipelineDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineStateMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineStateMetal.mm
>deleted file mode 100644
>index a3418a46d24856a502c517f88685abfa09cf69bc..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPURenderPipelineStateMetal.mm
>+++ /dev/null
>@@ -1,70 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPURenderPipelineState.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "GPURenderPipelineDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPURenderPipelineState::GPURenderPipelineState(GPUDevice* device, GPURenderPipelineDescriptor* descriptor)
>-{
>-    LOG(WebGPU, "GPURenderPipelineState::GPURenderPipelineState()");
>-
>-    if (!device || !device->platformDevice() || !descriptor || !descriptor->platformRenderPipelineDescriptor())
>-        return;
>-
>-    m_renderPipelineState = adoptNS((MTLRenderPipelineState *)[device->platformDevice() newRenderPipelineStateWithDescriptor:descriptor->platformRenderPipelineDescriptor() error:nil]);
>-}
>-
>-String GPURenderPipelineState::label() const
>-{
>-    if (!m_renderPipelineState)
>-        return emptyString();
>-
>-    return [m_renderPipelineState label];
>-}
>-
>-void GPURenderPipelineState::setLabel(const String& label)
>-{
>-    ASSERT(m_renderPipelineState);
>-    [m_renderPipelineState setLabel:label];
>-}
>-    
>-MTLRenderPipelineState *GPURenderPipelineState::platformRenderPipelineState()
>-{
>-    return m_renderPipelineState.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUTextureDescriptorMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUTextureDescriptorMetal.mm
>deleted file mode 100644
>index a3877c741f7c1034fc4dfb8dc86c018df2ff344f..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUTextureDescriptorMetal.mm
>+++ /dev/null
>@@ -1,129 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUTextureDescriptor.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUTextureDescriptor::GPUTextureDescriptor(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped)
>-{
>-    LOG(WebGPU, "GPUTextureDescriptor::GPUTextureDescriptor()");
>-
>-    m_textureDescriptor = (MTLTextureDescriptor *)[MTLTextureDescriptor texture2DDescriptorWithPixelFormat:static_cast<MTLPixelFormat>(pixelFormat) width:width height:height mipmapped:mipmapped];
>-}
>-
>-unsigned long GPUTextureDescriptor::width() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor width];
>-}
>-
>-void GPUTextureDescriptor::setWidth(unsigned long newWidth)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setWidth:newWidth];
>-}
>-
>-unsigned long GPUTextureDescriptor::height() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor height];
>-}
>-
>-void GPUTextureDescriptor::setHeight(unsigned long newHeight)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setHeight:newHeight];
>-}
>-
>-unsigned long GPUTextureDescriptor::sampleCount() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor sampleCount];
>-}
>-
>-void GPUTextureDescriptor::setSampleCount(unsigned long newSampleCount)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setSampleCount:newSampleCount];
>-}
>-
>-unsigned long GPUTextureDescriptor::textureType() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor textureType];
>-}
>-
>-void GPUTextureDescriptor::setTextureType(unsigned long newTextureType)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setTextureType:static_cast<MTLTextureType>(newTextureType)];
>-}
>-
>-unsigned long GPUTextureDescriptor::storageMode() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor storageMode];
>-}
>-
>-void GPUTextureDescriptor::setStorageMode(unsigned long newStorageMode)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setStorageMode:static_cast<MTLStorageMode>(newStorageMode)];
>-}
>-
>-unsigned long GPUTextureDescriptor::usage() const
>-{
>-    if (!m_textureDescriptor)
>-        return 0;
>-    return [m_textureDescriptor usage];
>-}
>-
>-void GPUTextureDescriptor::setUsage(unsigned long newUsage)
>-{
>-    ASSERT(m_textureDescriptor);
>-    [m_textureDescriptor setUsage:newUsage];
>-}
>-
>-MTLTextureDescriptor *GPUTextureDescriptor::platformTextureDescriptor()
>-{
>-    return m_textureDescriptor.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/GPUTextureMetal.mm b/Source/WebCore/platform/graphics/cocoa/GPUTextureMetal.mm
>deleted file mode 100644
>index b1d0f78a7dac77dfd407cbd68cc7dabe6a93de58..0000000000000000000000000000000000000000
>--- a/Source/WebCore/platform/graphics/cocoa/GPUTextureMetal.mm
>+++ /dev/null
>@@ -1,82 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#import "config.h"
>-#import "GPUTexture.h"
>-
>-#if ENABLE(WEBGPU)
>-
>-#import "GPUDevice.h"
>-#import "GPUDrawable.h"
>-#import "GPUTextureDescriptor.h"
>-#import "Logging.h"
>-
>-#import <Metal/Metal.h>
>-
>-namespace WebCore {
>-
>-GPUTexture::GPUTexture(GPUDevice* device, GPUTextureDescriptor* descriptor)
>-{
>-    LOG(WebGPU, "GPUTexture::GPUTexture()");
>-
>-    if (!device || !device->platformDevice() || !descriptor || !descriptor->platformTextureDescriptor())
>-        return;
>-
>-    m_texture = adoptNS((MTLTexture *)[device->platformDevice() newTextureWithDescriptor:descriptor->platformTextureDescriptor()]);
>-}
>-
>-GPUTexture::GPUTexture(GPUDrawable* other)
>-{
>-    LOG(WebGPU, "GPUTexture::GPUTexture()");
>-
>-    m_texture = other->platformTexture();
>-}
>-
>-unsigned long GPUTexture::width() const
>-{
>-    if (!m_texture)
>-        return 0;
>-
>-    id<MTLTexture> texture = static_cast<id<MTLTexture>>(m_texture.get());
>-    return texture.width;
>-}
>-
>-unsigned long GPUTexture::height() const
>-{
>-    if (!m_texture)
>-        return 0;
>-
>-    id<MTLTexture> texture = static_cast<id<MTLTexture>>(m_texture.get());
>-    return texture.height;
>-}
>-
>-MTLTexture *GPUTexture::platformTexture()
>-{
>-    return m_texture.get();
>-}
>-
>-} // namespace WebCore
>-
>-#endif
>diff --git a/Source/WebCore/platform/graphics/cocoa/WebCoreDecompressionSession.mm b/Source/WebCore/platform/graphics/cocoa/WebCoreDecompressionSession.mm
>index b762ea94cac2917db06476b61f7ebb3b097d4e40..f0debc03e5f07cf6dfc75fbb48b2f46257168628 100644
>--- a/Source/WebCore/platform/graphics/cocoa/WebCoreDecompressionSession.mm
>+++ b/Source/WebCore/platform/graphics/cocoa/WebCoreDecompressionSession.mm
>@@ -33,13 +33,14 @@
> #import <CoreMedia/CMBufferQueue.h>
> #import <CoreMedia/CMFormatDescription.h>
> #import <pal/avfoundation/MediaTimeAVFoundation.h>
>+#import <pal/cf/CoreMediaSoftLink.h>
> #import <wtf/MainThread.h>
> #import <wtf/MediaTime.h>
>+#import <wtf/MonotonicTime.h>
> #import <wtf/StringPrintStream.h>
> #import <wtf/Vector.h>
> #import <wtf/cf/TypeCastsCF.h>
> 
>-#import <pal/cf/CoreMediaSoftLink.h>
> #import "CoreVideoSoftLink.h"
> #import "VideoToolboxSoftLink.h"
> 
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUBuffer.cpp b/Source/WebCore/platform/graphics/gpu/GPUBuffer.cpp
>index 516156a30652d956d48a6438cae4ad766c37d417..01b1ee73543a0360426eb02109248c1836da0486 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUBuffer.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUBuffer.cpp
>@@ -28,37 +28,20 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
> #include "Logging.h"
>+#include <JavaScriptCore/ArrayBuffer.h>
> 
> namespace WebCore {
> 
>-RefPtr<GPUBuffer> GPUBuffer::create(GPUDevice* device, ArrayBufferView* arrayBuffer)
>-{
>-    RefPtr<GPUBuffer> buffer = adoptRef(new GPUBuffer(device, arrayBuffer));
>-    return buffer;
>-}
>-
> GPUBuffer::~GPUBuffer()
> {
>     LOG(WebGPU, "GPUBuffer::~GPUBuffer()");
> }
> 
>-#if !PLATFORM(COCOA)
>-unsigned long GPUBuffer::length() const
>-{
>-    return 0;
>-}
>-
>-RefPtr<ArrayBuffer> GPUBuffer::contents()
>+unsigned GPUBuffer::length() const
> {
>-    if (m_contents)
>-        return m_contents;
>-
>-    m_contents = ArrayBuffer::create(nullptr, 1);
>-    return m_contents;
>+    return m_contents ? m_contents->byteLength() : 0;
> }
>-#endif
> 
> } // namespace WebCore
> 
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUBuffer.h b/Source/WebCore/platform/graphics/gpu/GPUBuffer.h
>index 5fab99a05a765f80d83ee331d559fe0c99903b44..b572133ca288eb085d939cb50798cee827041162 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUBuffer.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUBuffer.h
>@@ -27,38 +27,39 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <JavaScriptCore/ArrayBufferView.h>
> #include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLBuffer;
>-#endif
>+OBJC_PROTOCOL(MTLBuffer);
>+
>+namespace JSC {
>+class ArrayBuffer;
>+class ArrayBufferView;
>+}
> 
> namespace WebCore {
> 
> class GPUDevice;
> 
>-class GPUBuffer : public RefCounted<GPUBuffer> {
>+class GPUBuffer {
> public:
>-    static RefPtr<GPUBuffer> create(GPUDevice*, ArrayBufferView*);
>+    WEBCORE_EXPORT GPUBuffer(const GPUDevice&, const JSC::ArrayBufferView&);
>     WEBCORE_EXPORT ~GPUBuffer();
> 
>-    WEBCORE_EXPORT unsigned long length() const;
>-    WEBCORE_EXPORT RefPtr<ArrayBuffer> contents();
>+    WEBCORE_EXPORT unsigned length() const;
>+    JSC::ArrayBuffer* contents() const { return m_contents.get(); }
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLBuffer *platformBuffer();
>+#if USE(METAL)
>+    MTLBuffer *metal() const { return m_metal.get(); }
> #endif
> 
> private:
>-    GPUBuffer(GPUDevice*, ArrayBufferView*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLBuffer> m_buffer;
>+#if USE(METAL)
>+    RetainPtr<MTLBuffer> m_metal;
> #endif
>-    RefPtr<ArrayBuffer> m_contents;
>+    RefPtr<JSC::ArrayBuffer> m_contents;
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.cpp b/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.cpp
>index 3b693608d0cd79103fb3ea6bc8491e70332a9828..282c8290833385eaf7fac2efca83a6f7e17cdb29 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.cpp
>@@ -29,47 +29,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUCommandQueue.h"
>-#include "GPUComputeCommandEncoder.h"
>-#include "GPUDevice.h"
>-#include "GPURenderCommandEncoder.h"
>-#include "GPURenderPassDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUCommandBuffer> GPUCommandBuffer::create(GPUCommandQueue* queue)
>-{
>-    RefPtr<GPUCommandBuffer> buffer = adoptRef(new GPUCommandBuffer(queue));
>-    return buffer;
>-}
>-
> GPUCommandBuffer::~GPUCommandBuffer()
> {
>     LOG(WebGPU, "GPUCommandBuffer::~GPUCommandBuffer()");
> }
> 
>-RefPtr<GPURenderCommandEncoder> GPUCommandBuffer::createRenderCommandEncoder(GPURenderPassDescriptor* descriptor)
>-{
>-    return GPURenderCommandEncoder::create(this, descriptor);
>-}
>-
>-RefPtr<GPUComputeCommandEncoder> GPUCommandBuffer::createComputeCommandEncoder()
>-{
>-    return GPUComputeCommandEncoder::create(this);
>-}
>-
>-#if !PLATFORM(COCOA)
>-void GPUCommandBuffer::presentDrawable(GPUDrawable*)
>-{
>-}
>-
>-DOMPromiseProxy<IDLVoid>& GPUCommandBuffer::completed();
>-{
>-    return m_completedPromise;
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.h b/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.h
>index dced276f23a6d1d4d2e0c00e884d2c2096b90493..456cf4899ccdd4dabcc79e1622309868016fba65 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUCommandBuffer.h
>@@ -28,48 +28,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "DOMPromiseProxy.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
>+#include <wtf/Function.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLCommandBuffer;
>-#endif
>+OBJC_PROTOCOL(MTLCommandBuffer);
> 
> namespace WebCore {
> 
> class GPUCommandQueue;
>-class GPUComputeCommandEncoder;
> class GPUDrawable;
>-class GPURenderCommandEncoder;
>-class GPURenderPassDescriptor;
> 
>-class GPUCommandBuffer : public RefCounted<GPUCommandBuffer> {
>+class GPUCommandBuffer {
> public:
>-    static RefPtr<GPUCommandBuffer> create(GPUCommandQueue*);
>-    WEBCORE_EXPORT ~GPUCommandBuffer();
>-
>-    WEBCORE_EXPORT void commit();
>-    WEBCORE_EXPORT void presentDrawable(GPUDrawable*);
>+    explicit GPUCommandBuffer(const GPUCommandQueue&, Function<void()>&& completedCallback);
>+    ~GPUCommandBuffer();
> 
>-    WEBCORE_EXPORT RefPtr<GPURenderCommandEncoder> createRenderCommandEncoder(GPURenderPassDescriptor*);
>-    WEBCORE_EXPORT RefPtr<GPUComputeCommandEncoder> createComputeCommandEncoder();
>-    WEBCORE_EXPORT DOMPromiseProxy<IDLVoid>& completed();
>+    void commit() const;
>+    void presentDrawable(GPUDrawable&) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLCommandBuffer *platformCommandBuffer();
>+#if USE(METAL)
>+    MTLCommandBuffer *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUCommandBuffer(GPUCommandQueue*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLCommandBuffer> m_commandBuffer;
>+    RetainPtr<MTLCommandBuffer> m_metal;
> #endif
>-
>-    DOMPromiseProxy<IDLVoid> m_completedPromise;
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.cpp b/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.cpp
>index ee357b2ac081331d7f512640e92b8d29c2b195e5..8222ace88c54abbb81e8a42cf774093c0b0baf69 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.cpp
>@@ -28,39 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUCommandBuffer.h"
>-#include "GPUDevice.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUCommandQueue> GPUCommandQueue::create(GPUDevice* device)
>-{
>-    RefPtr<GPUCommandQueue> queue = adoptRef(new GPUCommandQueue(device));
>-    return queue;
>-}
>-
> GPUCommandQueue::~GPUCommandQueue()
> {
>     LOG(WebGPU, "GPUCommandQueue::~GPUCommandQueue()");
> }
> 
>-RefPtr<GPUCommandBuffer> GPUCommandQueue::createCommandBuffer()
>-{
>-    return GPUCommandBuffer::create(this);
>-}
>-
>-#if !PLATFORM(COCOA)
>-String GPUCommandQueue::label() const
>-{
>-    return emptyString();
>-}
>-
>-void GPUCommandQueue::setLabel(const String&)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.h b/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.h
>index 2a19e7250fabb1b85e173a7c361f9b8fe90dc8dd..e3d1e4c85b1aac7c0317ada3e3aeb4558de17d71 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUCommandQueue.h
>@@ -27,41 +27,32 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/text/WTFString.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLCommandQueue;
>-#endif
>+OBJC_PROTOCOL(MTLCommandQueue);
> 
> namespace WebCore {
> 
>-class GPUCommandBuffer;
> class GPUDevice;
> 
>-class GPUCommandQueue : public RefCounted<GPUCommandQueue> {
>+class GPUCommandQueue {
> public:
>-    static RefPtr<GPUCommandQueue> create(GPUDevice*);
>+    WEBCORE_EXPORT explicit GPUCommandQueue(const GPUDevice&);
>     WEBCORE_EXPORT ~GPUCommandQueue();
> 
>     WEBCORE_EXPORT String label() const;
>-    WEBCORE_EXPORT void setLabel(const String&);
>-
>-    WEBCORE_EXPORT RefPtr<GPUCommandBuffer> createCommandBuffer();
>+    WEBCORE_EXPORT void setLabel(const String&) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLCommandQueue *platformCommandQueue();
>+#if USE(METAL)
>+    MTLCommandQueue *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUCommandQueue(GPUDevice*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLCommandQueue> m_commandQueue;
>+    RetainPtr<MTLCommandQueue> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.cpp b/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.cpp
>index cb8591a607a5cdf4a60185fe24f17d17acb7708b..c1b835362051585cc504858d19dfb91f040cd246 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.cpp
>@@ -28,42 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUBuffer.h"
>-#include "GPUCommandBuffer.h"
>-#include "GPUComputePipelineState.h"
> #include "Logging.h"
> 
> namespace WebCore {
>     
>-RefPtr<GPUComputeCommandEncoder> GPUComputeCommandEncoder::create(GPUCommandBuffer* buffer)
>-{
>-    RefPtr<GPUComputeCommandEncoder> encoder = adoptRef(new GPUComputeCommandEncoder(buffer));
>-    return encoder;
>-}
>-    
> GPUComputeCommandEncoder::~GPUComputeCommandEncoder()
> {
>     LOG(WebGPU, "GPUComputeCommandEncoder::~GPUComputeCommandEncoder()");
> }
>     
>-#if !PLATFORM(COCOA)
>-void GPUComputeCommandEncoder::setComputePipelineState(GPUComputePipelineState*)
>-{
>-}
>-    
>-void GPUComputeCommandEncoder::setBuffer(GPUBuffer*, unsigned, unsigned)
>-{
>-}
>-    
>-void GPUComputeCommandEncoder::dispatch(GPUSize threadgroupsPerGrid, GPUSize threadsPerThreadgroup);
>-{
>-}
>-
>-void GPUComputeCommandEncoder::endEncoding()
>-{
>-}
>-#endif
>-    
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.h b/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.h
>index c6cad3223dce4f391a9a96a0a7e1fd96d731268e..cf167c34a6c36cc412b201f57e10ad7ac762ceae 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUComputeCommandEncoder.h
>@@ -27,14 +27,9 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUSize.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLComputeCommandEncoder;
>-#endif
>+OBJC_PROTOCOL(MTLComputeCommandEncoder);
> 
> namespace WebCore {
>     
>@@ -42,27 +37,24 @@ class GPUBuffer;
> class GPUCommandBuffer;
> class GPUComputePipelineState;
> 
>-class GPUComputeCommandEncoder : public RefCounted<GPUComputeCommandEncoder> {
>+struct GPUSize;
>+
>+class GPUComputeCommandEncoder {
> public:
>-    static RefPtr<GPUComputeCommandEncoder> create(GPUCommandBuffer*);
>-    WEBCORE_EXPORT ~GPUComputeCommandEncoder();
>-        
>-    WEBCORE_EXPORT void setComputePipelineState(GPUComputePipelineState*);
>-    WEBCORE_EXPORT void setBuffer(GPUBuffer*, unsigned, unsigned);
>-    WEBCORE_EXPORT void dispatch(GPUSize, GPUSize);
>-    WEBCORE_EXPORT void endEncoding();
>-        
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLComputeCommandEncoder *platformComputeCommandEncoder();
>-#endif
>-        
>+    explicit GPUComputeCommandEncoder(const GPUCommandBuffer&);
>+    ~GPUComputeCommandEncoder();
>+
>+    void setComputePipelineState(const GPUComputePipelineState&) const;
>+    void setBuffer(const GPUBuffer&, unsigned, unsigned) const;
>+    void dispatch(GPUSize, GPUSize) const;
>+    void endEncoding() const;
>+
>+#if USE(METAL)
> private:
>-    GPUComputeCommandEncoder(GPUCommandBuffer*);
>-        
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLComputeCommandEncoder> m_computeCommandEncoder;
>+    RetainPtr<MTLComputeCommandEncoder> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.cpp b/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.cpp
>index 864e98fa4bfcf0d3f49ba47a2c0859259fbf0980..c15829a94ab4023bcfa717f29cf2b29d4c2466ed 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.cpp
>@@ -28,17 +28,10 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
> #include "Logging.h"
> 
> namespace WebCore {
>     
>-RefPtr<GPUComputePipelineState> GPUComputePipelineState::create(GPUDevice* device, GPUFunction* function)
>-{
>-    RefPtr<GPUComputePipelineState> state = adoptRef(new GPUComputePipelineState(device, function));
>-    return state;
>-}
>-    
> GPUComputePipelineState::~GPUComputePipelineState()
> {
>     LOG(WebGPU, "GPUComputePipelineState::~GPUComputePipelineState()");
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.h b/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.h
>index fe184c1c8e2f30126a48e8331e7cf160d5999e23..10e0b4d76ed24eaf53e428eb2dbb488455686c80 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUComputePipelineState.h
>@@ -27,36 +27,31 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/text/WTFString.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLComputePipelineState;
>-#endif
>+OBJC_PROTOCOL(MTLComputePipelineState);
> 
> namespace WebCore {
> 
> class GPUDevice;
> class GPUFunction;
> 
>-class GPUComputePipelineState : public RefCounted<GPUComputePipelineState> {
>+class GPUComputePipelineState {
> public:
>-    static RefPtr<GPUComputePipelineState> create(GPUDevice*, GPUFunction*);
>-    WEBCORE_EXPORT ~GPUComputePipelineState();
>+    GPUComputePipelineState() = default;
>+    GPUComputePipelineState(const GPUDevice&, const GPUFunction&);
>+    ~GPUComputePipelineState();
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLComputePipelineState *platformComputePipelineState();
>+#if USE(METAL)
>+    MTLComputePipelineState *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUComputePipelineState(GPUDevice*, GPUFunction*);
>-
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLComputePipelineState> m_computePipelineState;
>+    RetainPtr<MTLComputePipelineState> m_metal;
> #endif
> };
> 
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.cpp
>index 202c65c16718b58eda61c3730c2aa500fa77cf0f..8525468f2ae6e07491fe9e4cb16152520f13e729 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.cpp
>@@ -28,41 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUTexture.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUDepthStencilDescriptor> GPUDepthStencilDescriptor::create()
>-{
>-    RefPtr<GPUDepthStencilDescriptor> descriptor = adoptRef(new GPUDepthStencilDescriptor());
>-    return descriptor;
>-}
>-
> GPUDepthStencilDescriptor::~GPUDepthStencilDescriptor()
> {
>     LOG(WebGPU, "GPUDepthStencilDescriptor::~GPUDepthStencilDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-bool GPUDepthStencilDescriptor::depthWriteEnabled() const
>-{
>-    return false;
>-}
>-
>-void GPUDepthStencilDescriptor::setDepthWriteEnabled(bool)
>-{
>-}
>-
>-GPUCompareFunction GPUDepthStencilDescriptor::depthCompareFunction() const
>-{
>-}
>-
>-void GPUDepthStencilDescriptor::setDepthCompareFunction(GPUCompareFunction)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.h
>index 89c4531e8fa77dc199a2f87c124db15b1cd35fd1..0579a66b81c69c4dda2975e7bba7fa18af3d52c9 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilDescriptor.h
>@@ -27,38 +27,35 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUEnums.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLDepthStencilDescriptor;
>-#endif
> 
> namespace WebCore {
> 
>-class GPUDepthStencilDescriptor : public RefCounted<GPUDepthStencilDescriptor> {
>+enum class GPUCompareFunction;
>+
>+class GPUDepthStencilDescriptor {
> public:
>-    static RefPtr<GPUDepthStencilDescriptor> create();
>-    WEBCORE_EXPORT ~GPUDepthStencilDescriptor();
>+    GPUDepthStencilDescriptor();
>+    ~GPUDepthStencilDescriptor();
> 
>-    WEBCORE_EXPORT bool depthWriteEnabled() const;
>-    WEBCORE_EXPORT void setDepthWriteEnabled(bool);
>+    bool depthWriteEnabled() const;
>+    void setDepthWriteEnabled(bool) const;
> 
>-    WEBCORE_EXPORT GPUCompareFunction depthCompareFunction() const;
>-    WEBCORE_EXPORT void setDepthCompareFunction(GPUCompareFunction);
>+    GPUCompareFunction depthCompareFunction() const;
>+    void setDepthCompareFunction(GPUCompareFunction) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLDepthStencilDescriptor *platformDepthStencilDescriptor();
>+#if USE(METAL)
>+    MTLDepthStencilDescriptor *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUDepthStencilDescriptor();
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLDepthStencilDescriptor> m_depthStencilDescriptor;
>+    RetainPtr<MTLDepthStencilDescriptor> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.cpp b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.cpp
>index 6965d9dfc1cc3810323b19246d7b7790e2e4bc10..571edaeb1d73f5067da6566c42e5887e7abf188b 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.cpp
>@@ -28,34 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDepthStencilDescriptor.h"
>-#include "GPUDevice.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUDepthStencilState> GPUDepthStencilState::create(GPUDevice* device, GPUDepthStencilDescriptor* descriptor)
>-{
>-    RefPtr<GPUDepthStencilState> state = adoptRef(new GPUDepthStencilState(device, descriptor));
>-    return state;
>-}
>-
> GPUDepthStencilState::~GPUDepthStencilState()
> {
>     LOG(WebGPU, "GPUDepthStencilState::~GPUDepthStencilState()");
> }
> 
>-#if !PLATFORM(COCOA)
>-String GPUDepthStencilState::label() const
>-{
>-    return emptyString();
>-}
>-
>-void GPUDepthStencilState::setLabel(const String&)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.h b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.h
>index 98d40284af63ac50a188f06ee3be9b3e43a6f5ff..15b5cf826ce8e293c1f0fd945f189560333ffa0d 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDepthStencilState.h
>@@ -27,39 +27,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/text/WTFString.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLDepthStencilState;
>-#endif
>+OBJC_PROTOCOL(MTLDepthStencilState);
> 
> namespace WebCore {
> 
> class GPUDevice;
> class GPUDepthStencilDescriptor;
> 
>-class GPUDepthStencilState : public RefCounted<GPUDepthStencilState> {
>+class GPUDepthStencilState {
> public:
>-    static RefPtr<GPUDepthStencilState> create(GPUDevice*, GPUDepthStencilDescriptor*);
>-    WEBCORE_EXPORT ~GPUDepthStencilState();
>+    GPUDepthStencilState() = default;
>+    GPUDepthStencilState(const GPUDevice&, const GPUDepthStencilDescriptor&);
>+    ~GPUDepthStencilState();
> 
>-    WEBCORE_EXPORT String label() const;
>-    WEBCORE_EXPORT void setLabel(const String&);
>+    String label() const;
>+    void setLabel(const String&) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLDepthStencilState *platformDepthStencilState();
>+#if USE(METAL)
>+    MTLDepthStencilState *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUDepthStencilState(GPUDevice*, GPUDepthStencilDescriptor*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLDepthStencilState> m_depthStencilState;
>+    RetainPtr<MTLDepthStencilState> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDevice.cpp b/Source/WebCore/platform/graphics/gpu/GPUDevice.cpp
>index a1565227ec06c17affa2969ac4c667a8b27b5be0..5448fbcc3d845af8bbe6f36ab2589120bf9de2ed 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDevice.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDevice.cpp
>@@ -28,74 +28,16 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUBuffer.h"
>-#include "GPUCommandQueue.h"
>-#include "GPUDrawable.h"
>-#include "GPULibrary.h"
>-#include "GPUTexture.h"
>-#include "GPUTextureDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUDevice> GPUDevice::create()
>-{
>-    RefPtr<GPUDevice> device = adoptRef(new GPUDevice());
>-
>-#if PLATFORM(COCOA)
>-    if (!device->platformDevice()) {
>-        LOG(WebGPU, "GPUDevice::create() was unable to create the low-level device");
>-        return nullptr;
>-    }
>-#endif
>-
>-    LOG(WebGPU, "GPUDevice::create() device is %p", device.get());
>-    return device;
>-}
>-
> GPUDevice::~GPUDevice()
> {
>     LOG(WebGPU, "GPUDevice::~GPUDevice()");
>+    disconnect();
> }
> 
>-RefPtr<GPUCommandQueue> GPUDevice::createCommandQueue()
>-{
>-    return GPUCommandQueue::create(this);
>-}
>-
>-RefPtr<GPULibrary> GPUDevice::createLibrary(const String& sourceCode)
>-{
>-    return GPULibrary::create(this, sourceCode);
>-}
>-
>-RefPtr<GPUBuffer> GPUDevice::createBufferFromData(ArrayBufferView* data)
>-{
>-    return GPUBuffer::create(this, data);
>-}
>-
>-RefPtr<GPUTexture> GPUDevice::createTexture(GPUTextureDescriptor* descriptor)
>-{
>-    return GPUTexture::create(this, descriptor);
>-}
>-
>-RefPtr<GPUDrawable> GPUDevice::getFramebuffer()
>-{
>-    return GPUDrawable::create(this);
>-}
>-
>-#if !PLATFORM(COCOA)
>-
>-GPUDevice::GPUDevice()
>-{
>-
>-}
>-
>-void GPUDevice::reshape(int, int)
>-{
>-}
>-
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDevice.h b/Source/WebCore/platform/graphics/gpu/GPUDevice.h
>index df194eb23a6a35abddf7e56fb61aa8abeca280c1..d9870f9298c3bd6ec7c5e21080927ff1ee6e0059 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDevice.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDevice.h
>@@ -27,60 +27,38 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "PlatformLayer.h"
>-#include <JavaScriptCore/ArrayBufferView.h>
>-#include <wtf/Forward.h>
>-#include <wtf/RefCounted.h>
>+#include <wtf/RetainPtr.h>
> 
>-#if USE(CA)
>-#include "PlatformCALayer.h"
>-#endif
>-
>-#if PLATFORM(COCOA)
>-typedef struct objc_object* id;
> OBJC_CLASS CALayer;
> OBJC_CLASS WebGPULayer;
>-#else
>-class WebGPULayer;
>-#endif
> 
>-namespace WebCore {
>+OBJC_PROTOCOL(MTLDevice);
> 
>-class GPUBuffer;
>-class GPUCommandQueue;
>-class GPUDrawable;
>-class GPULibrary;
>-class GPUTexture;
>-class GPUTextureDescriptor;
>+namespace WebCore {
> 
>-class GPUDevice : public RefCounted<GPUDevice> {
>+class GPUDevice {
> public:
>-    WEBCORE_EXPORT static RefPtr<GPUDevice> create();
>+    WEBCORE_EXPORT GPUDevice();
>     WEBCORE_EXPORT ~GPUDevice();
> 
>-    void reshape(int width, int height);
>-
>-#if PLATFORM(COCOA)
>-    WebGPULayer* layer() { return m_layer.get(); }
>-    CALayer* platformLayer() const { return reinterpret_cast<CALayer*>(m_layer.get()); }
>-    WEBCORE_EXPORT id platformDevice();
>-#endif
>+    WEBCORE_EXPORT bool operator!() const;
> 
>-    WEBCORE_EXPORT RefPtr<GPUCommandQueue> createCommandQueue();
>-    WEBCORE_EXPORT RefPtr<GPULibrary> createLibrary(const String& sourceCode);
>-    WEBCORE_EXPORT RefPtr<GPUBuffer> createBufferFromData(ArrayBufferView* data);
>-    WEBCORE_EXPORT RefPtr<GPUTexture> createTexture(GPUTextureDescriptor*);
>+    void reshape(int width, int height) const;
> 
>-    RefPtr<GPUDrawable> getFramebuffer();
>+#if USE(METAL)
>+    WebGPULayer *layer() const { return m_layer.get(); }
>+    WEBCORE_EXPORT CALayer *platformLayer() const;
>+    MTLDevice *metal() const { return m_metal.get(); }
>+#endif
> 
>-    void markLayerComposited() { }
>+    void markLayerComposited() const { }
> 
> private:
>-    GPUDevice();
>+    void disconnect();
> 
>-#if PLATFORM(COCOA)
>+#if USE(METAL)
>     RetainPtr<WebGPULayer> m_layer;
>-    RetainPtr<id> m_device;
>+    RetainPtr<MTLDevice> m_metal;
> #endif
> };
> 
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDrawable.cpp b/Source/WebCore/platform/graphics/gpu/GPUDrawable.cpp
>index 563a75d1b1836e6b4e149966c0a887049a0ca4bb..8d8ea4c3cffeb1d788035514a1e72cec812738b7 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDrawable.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDrawable.cpp
>@@ -28,29 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUCommandBuffer.h"
>-#include "GPUDevice.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUDrawable> GPUDrawable::create(GPUDevice* device)
>-{
>-    RefPtr<GPUDrawable> drawable = adoptRef(new GPUDrawable(device));
>-    return drawable;
>-}
>-
> GPUDrawable::~GPUDrawable()
> {
>     LOG(WebGPU, "GPUDrawable::~GPUDrawable()");
> }
> 
>-#if !PLATFORM(COCOA)
>-void GPUDrawable::release()
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUDrawable.h b/Source/WebCore/platform/graphics/gpu/GPUDrawable.h
>index cca2bcf0014540633d46e712711bea3f7b98eba1..6f4329233f724e6727146c95a7fc94907f9dd532 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUDrawable.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUDrawable.h
>@@ -27,38 +27,32 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLDrawable;
>-OBJC_CLASS MTLTexture;
>-#endif
>+OBJC_PROTOCOL(MTLDrawable);
>+OBJC_PROTOCOL(MTLTexture);
> 
> namespace WebCore {
> 
>-class GPUTexture;
> class GPUDevice;
> 
>-class GPUDrawable : public RefCounted<GPUDrawable> {
>+class GPUDrawable {
> public:
>-    static RefPtr<GPUDrawable> create(GPUDevice*);
>-    WEBCORE_EXPORT ~GPUDrawable();
>+    explicit GPUDrawable(const GPUDevice&);
>+    ~GPUDrawable();
>+
>+    void release();
> 
>-    WEBCORE_EXPORT void release();
>+#if USE(METAL)
>+    MTLDrawable *metal() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLDrawable *platformDrawable();
>     // FIXME: WebGPU - not all drawables should have this. Only the framebuffer.
>-    WEBCORE_EXPORT MTLTexture *platformTexture();
>+    MTLTexture *texture() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUDrawable(GPUDevice*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLDrawable> m_drawable;
>+    RetainPtr<MTLDrawable> m_metal;
> #endif
> };
>     
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUEnums.h b/Source/WebCore/platform/graphics/gpu/GPUEnums.h
>index aace62d510f57d87cafac13dc0b7ec2a31683deb..6def60aa31f7714571b8cf06e92315ddcbf27a18 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUEnums.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUEnums.h
>@@ -41,4 +41,5 @@ enum class GPUCompareFunction {
> };
> 
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUFunction.cpp b/Source/WebCore/platform/graphics/gpu/GPUFunction.cpp
>index 3f27aefcb92b94ea84620dbd521da9a346d124f3..0d0b399450cb7ba09bf26d70872f93fde7225be8 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUFunction.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUFunction.cpp
>@@ -28,40 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPULibrary.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUFunction> GPUFunction::create(GPULibrary* library, const String& name)
>-{
>-    RefPtr<GPUFunction> function = adoptRef(new GPUFunction(library, name));
>-#if PLATFORM(COCOA)
>-    if (!function->platformFunction())
>-        return nullptr;
>-#endif
>-    return function;
>-}
>-
> GPUFunction::~GPUFunction()
> {
>     LOG(WebGPU, "GPUFunction::~GPUFunction()");
> }
> 
>-#if !PLATFORM(COCOA)
>-GPUFunction::GPUFunction(GPULibrary*, const String&)
>-{
>-    LOG(WebGPU, "GPUFunction::GPUFunction()");
>-}
>-
>-String GPUFunction::name() const
>-{
>-    return emptyString();
>-}
>-#endif
>-
>-    
> } // namespace WebCore
> 
> #endif
>-
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUFunction.h b/Source/WebCore/platform/graphics/gpu/GPUFunction.h
>index 7d7fdf15cf21140c3526175414b1fef3f45ebf9c..96fa492e182a1be3cab785ec409216c368a46475 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUFunction.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUFunction.h
>@@ -27,35 +27,30 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
>-#include <wtf/Vector.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLFunction;
>-#endif
>+OBJC_PROTOCOL(MTLFunction);
> 
> namespace WebCore {
> 
> class GPULibrary;
> 
>-class GPUFunction : public RefCounted<GPUFunction> {
>+class GPUFunction {
> public:
>-    static RefPtr<GPUFunction> create(GPULibrary*, const String& name);
>+    WEBCORE_EXPORT GPUFunction(const GPULibrary&, const String& name);
>     WEBCORE_EXPORT ~GPUFunction();
> 
>+    bool operator!() const;
>+
>     WEBCORE_EXPORT String name() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLFunction *platformFunction();
>+#if USE(METAL)
>+    MTLFunction *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUFunction(GPULibrary*, const String& name);
>-
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLFunction> m_function;
>+    RetainPtr<MTLFunction> m_metal;
> #endif
> };
>     
>diff --git a/Source/WebCore/platform/graphics/gpu/GPULibrary.cpp b/Source/WebCore/platform/graphics/gpu/GPULibrary.cpp
>index 17939c02706729b7fd3d9c4fdb3ab676cce35a73..9062488592654d900a502f1acb421967334fff58 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPULibrary.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPULibrary.cpp
>@@ -28,46 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
>-#include "GPUFunction.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPULibrary> GPULibrary::create(GPUDevice* device, const String& sourceCode)
>-{
>-    RefPtr<GPULibrary> library = adoptRef(new GPULibrary(device, sourceCode));
>-    return library;
>-}
>-
> GPULibrary::~GPULibrary()
> {
>     LOG(WebGPU, "GPULibrary::~GPULibrary()");
> }
> 
>-#if !PLATFORM(COCOA)
>-
>-String GPULibrary::label() const
>-{
>-    return emptyString();
>-}
>-
>-void GPULibrary::setLabel(const String&)
>-{
>-}
>-
>-Vector<String> GPULibrary::functionNames()
>-{
>-    return { };
>-}
>-
>-#endif
>-
>-RefPtr<GPUFunction> GPULibrary::functionWithName(const String& name)
>-{
>-    return GPUFunction::create(this, name);
>-}
>-    
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPULibrary.h b/Source/WebCore/platform/graphics/gpu/GPULibrary.h
>index 985b96eb0b49fc0d2dbb9ccf3d2ef8f9063e07ff..f35d5ba146a94bd5bb50f2d1841540e6ecf6c8f5 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPULibrary.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPULibrary.h
>@@ -27,43 +27,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
>-#include <wtf/Vector.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLLibrary;
>-#endif
>+OBJC_PROTOCOL(MTLLibrary);
> 
> namespace WebCore {
> 
> class GPUDevice;
>-class GPUFunction;
> 
>-class GPULibrary : public RefCounted<GPULibrary> {
>+class GPULibrary {
> public:
>-    static RefPtr<GPULibrary> create(GPUDevice*, const String& sourceCode);
>+    WEBCORE_EXPORT GPULibrary(const GPUDevice&, const String& sourceCode);
>     WEBCORE_EXPORT ~GPULibrary();
> 
>     WEBCORE_EXPORT String label() const;
>-    WEBCORE_EXPORT void setLabel(const String&);
>-
>-    WEBCORE_EXPORT Vector<String> functionNames();
>+    WEBCORE_EXPORT void setLabel(const String&) const;
> 
>-    WEBCORE_EXPORT RefPtr<GPUFunction> functionWithName(const String&);
>+    WEBCORE_EXPORT Vector<String> functionNames() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLLibrary *platformLibrary();
>+#if USE(METAL)
>+    MTLLibrary *metal() const { return m_metal.get(); }
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPULibrary(GPUDevice*, const String& sourceCode);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLLibrary> m_library;
>+    RetainPtr<MTLLibrary> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.cpp
>index 9d19044f8f3e452006b7e143b0953fcda2e9ac6b..6d1f53b9472e17350587f77432b4da235e3aa1f9 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.cpp
>@@ -28,49 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUCommandBuffer.h"
>-#include "GPURenderPassDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPURenderCommandEncoder> GPURenderCommandEncoder::create(GPUCommandBuffer* buffer, GPURenderPassDescriptor* descriptor)
>-{
>-    RefPtr<GPURenderCommandEncoder> encoder = adoptRef(new GPURenderCommandEncoder(buffer, descriptor));
>-    return encoder;
>-}
>-
> GPURenderCommandEncoder::~GPURenderCommandEncoder()
> {
>     LOG(WebGPU, "GPURenderCommandEncoder::~GPURenderCommandEncoder()");
> }
> 
>-#if !PLATFORM(COCOA)
>-void GPURenderCommandEncoder::setRenderPipelineState(GPURenderPipelineState*)
>-{
>-}
>-
>-void GPURenderCommandEncoder::setDepthStencilState(GPUDepthStencilState*)
>-{
>-}
>-
>-void GPURenderCommandEncoder::setVertexBuffer(GPUBuffer*, unsigned, unsigned)
>-{
>-}
>-
>-void GPURenderCommandEncoder::setFragmentBuffer(GPUBuffer*, unsigned, unsigned)
>-{
>-}
>-
>-void GPURenderCommandEncoder::drawPrimitives(unsigned, unsigned, unsigned)
>-{
>-}
>-
>-void GPURenderCommandEncoder::endEncoding()
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.h b/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.h
>index 378edd2abeb3d80eba6f44dcdbd6d688cbcad1aa..f9053cec5b0c9b9630b5d7b632c6d9b7b31bf49e 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderCommandEncoder.h
>@@ -27,13 +27,9 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLRenderCommandEncoder;
>-#endif
>+OBJC_PROTOCOL(MTLRenderCommandEncoder);
> 
> namespace WebCore {
> 
>@@ -43,29 +39,24 @@ class GPUDepthStencilState;
> class GPURenderPassDescriptor;
> class GPURenderPipelineState;
> 
>-class GPURenderCommandEncoder : public RefCounted<GPURenderCommandEncoder> {
>+class GPURenderCommandEncoder {
> public:
>-    static RefPtr<GPURenderCommandEncoder> create(GPUCommandBuffer*, GPURenderPassDescriptor*);
>-    WEBCORE_EXPORT ~GPURenderCommandEncoder();
>-
>-    WEBCORE_EXPORT void setRenderPipelineState(GPURenderPipelineState*);
>-    WEBCORE_EXPORT void setDepthStencilState(GPUDepthStencilState*);
>-    WEBCORE_EXPORT void setVertexBuffer(GPUBuffer*, unsigned offset, unsigned index);
>-    WEBCORE_EXPORT void setFragmentBuffer(GPUBuffer*, unsigned offset, unsigned index);
>-    WEBCORE_EXPORT void drawPrimitives(unsigned type, unsigned start, unsigned count);
>-    WEBCORE_EXPORT void endEncoding();
>+    GPURenderCommandEncoder(const GPUCommandBuffer&, const GPURenderPassDescriptor&);
>+    ~GPURenderCommandEncoder();
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderCommandEncoder *platformRenderCommandEncoder();
>-#endif
>+    void setRenderPipelineState(const GPURenderPipelineState&) const;
>+    void setDepthStencilState(const GPUDepthStencilState&) const;
>+    void setVertexBuffer(const GPUBuffer&, unsigned offset, unsigned index) const;
>+    void setFragmentBuffer(const GPUBuffer&, unsigned offset, unsigned index) const;
>+    void drawPrimitives(unsigned type, unsigned start, unsigned count) const;
>+    void endEncoding() const;
> 
>+#if USE(METAL)
> private:
>-    GPURenderCommandEncoder(GPUCommandBuffer*, GPURenderPassDescriptor*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLRenderCommandEncoder> m_renderCommandEncoder;
>+    RetainPtr<MTLRenderCommandEncoder> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.cpp
>index 599e3772623cb17b4a1f0f726eade3cb9d68aba6..75d89e99844ce04b3fb8a56264a65438a9c55a05 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.cpp
>@@ -38,35 +38,6 @@ GPURenderPassAttachmentDescriptor::~GPURenderPassAttachmentDescriptor()
>     LOG(WebGPU, "GPURenderPassAttachmentDescriptor::~GPURenderPassAttachmentDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor()");
>-}
>-
>-unsigned long GPURenderPassAttachmentDescriptor::loadAction() const
>-{
>-    return 0;
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setLoadAction(unsigned long)
>-{
>-}
>-
>-unsigned long GPURenderPassAttachmentDescriptor::storeAction() const
>-{
>-    return 0;
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setStoreAction(unsigned long)
>-{
>-}
>-
>-void GPURenderPassAttachmentDescriptor::setTexture(RefPtr<GPUTexture>)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.h
>index 3d488569d0aca9548af21acd5c5efea88f4dd494..fef7094a9ce3299c409674c9a7f57469bad9a6b8 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassAttachmentDescriptor.h
>@@ -27,42 +27,39 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPassAttachmentDescriptor;
>-#endif
> 
> namespace WebCore {
> 
> class GPUTexture;
> 
>-class GPURenderPassAttachmentDescriptor : public RefCounted<GPURenderPassAttachmentDescriptor> {
>+class GPURenderPassAttachmentDescriptor {
> public:
>-    WEBCORE_EXPORT ~GPURenderPassAttachmentDescriptor();
>+    ~GPURenderPassAttachmentDescriptor();
> 
>-    WEBCORE_EXPORT unsigned long loadAction() const;
>-    WEBCORE_EXPORT void setLoadAction(unsigned long);
>+    unsigned loadAction() const;
>+    void setLoadAction(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long storeAction() const;
>-    WEBCORE_EXPORT void setStoreAction(unsigned long);
>+    unsigned storeAction() const;
>+    void setStoreAction(unsigned) const;
> 
>-    WEBCORE_EXPORT void setTexture(RefPtr<GPUTexture>);
>+    void setTexture(const GPUTexture&) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPassAttachmentDescriptor *platformRenderPassAttachmentDescriptor();
>+#if USE(METAL)
>+    MTLRenderPassAttachmentDescriptor *metal() const;
> #endif
> 
>+#if USE(METAL)
> protected:
>-#if PLATFORM(COCOA)
>-    GPURenderPassAttachmentDescriptor(MTLRenderPassAttachmentDescriptor *);
>-    RetainPtr<MTLRenderPassAttachmentDescriptor> m_renderPassAttachmentDescriptor;
>-#else
>-    GPURenderPassAttachmentDescriptor();
>+    explicit GPURenderPassAttachmentDescriptor(MTLRenderPassAttachmentDescriptor *);
>+
>+private:
>+    RetainPtr<MTLRenderPassAttachmentDescriptor> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.cpp
>index 5c7152e3ebe2e04072f0a40e7d25b7f114f45729..2f5ac788f218db3ca71a501ad1113e839d1d74b9 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.cpp
>@@ -28,41 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPassAttachmentDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-#if !PLATFORM(COCOA)
>-RefPtr<GPURenderPassColorAttachmentDescriptor> GPURenderPassColorAttachmentDescriptor::create()
>-{
>-    RefPtr<GPURenderPassColorAttachmentDescriptor> descriptor = adoptRef(new GPURenderPassColorAttachmentDescriptor());
>-    return descriptor;
>-}
>-
>-GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor()
>-    : GPURenderPassAttachmentDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor()");
>-}
>-#endif
>-
> GPURenderPassColorAttachmentDescriptor::~GPURenderPassColorAttachmentDescriptor()
> {
>     LOG(WebGPU, "GPURenderPassColorAttachmentDescriptor::~GPURenderPassColorAttachmentDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-Vector<float> GPURenderPassColorAttachmentDescriptor::clearColor() const
>-{
>-    return Vector<float>();
>-}
>-
>-void GPURenderPassColorAttachmentDescriptor::setClearColor(const Vector<float>&)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.h
>index 7b07ab937b9a68fe58e783092462044ea0952e8d..31aee8fb62bc971da02c96e58c44aacd5388aff6 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassColorAttachmentDescriptor.h
>@@ -28,40 +28,26 @@
> #if ENABLE(WEBGPU)
> 
> #include "GPURenderPassAttachmentDescriptor.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
>-#include <wtf/RetainPtr.h>
>-#include <wtf/Vector.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPassColorAttachmentDescriptor;
>-#endif
> 
> namespace WebCore {
> 
> class GPURenderPassColorAttachmentDescriptor : public GPURenderPassAttachmentDescriptor {
> public:
>-#if PLATFORM(COCOA)
>-    static RefPtr<GPURenderPassColorAttachmentDescriptor> create(MTLRenderPassColorAttachmentDescriptor *);
>-#else
>-    static RefPtr<GPURenderPassColorAttachmentDescriptor> create();
>+#if USE(METAL)
>+    GPURenderPassColorAttachmentDescriptor(MTLRenderPassColorAttachmentDescriptor *);
> #endif
>-    WEBCORE_EXPORT ~GPURenderPassColorAttachmentDescriptor();
>-
>-    WEBCORE_EXPORT Vector<float> clearColor() const;
>-    WEBCORE_EXPORT void setClearColor(const Vector<float>&);
>+    ~GPURenderPassColorAttachmentDescriptor();
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPassColorAttachmentDescriptor *platformRenderPassColorAttachmentDescriptor();
>-#endif
>+    Vector<float> clearColor() const;
>+    void setClearColor(const Vector<float>&) const;
> 
>-private:
>-#if PLATFORM(COCOA)
>-    GPURenderPassColorAttachmentDescriptor(MTLRenderPassColorAttachmentDescriptor *);
>-#else
>-    GPURenderPassColorAttachmentDescriptor();
>+#if USE(METAL)
>+    MTLRenderPassColorAttachmentDescriptor *metal() const;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.cpp
>index aa4e457d476065b09c236e53929e739074c16a64..4c1ca67167a1ff5f09fa7b055d4725a86f18691a 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.cpp
>@@ -28,41 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPURenderPassAttachmentDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-#if !PLATFORM(COCOA)
>-RefPtr<GPURenderPassDepthAttachmentDescriptor> GPURenderPassDepthAttachmentDescriptor::create()
>-{
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> descriptor = adoptRef(new GPURenderPassDepthAttachmentDescriptor());
>-    return descriptor;
>-}
>-
>-GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor()
>-    : GPURenderPassAttachmentDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor()");
>-}
>-#endif
>-
> GPURenderPassDepthAttachmentDescriptor::~GPURenderPassDepthAttachmentDescriptor()
> {
>     LOG(WebGPU, "GPURenderPassDepthAttachmentDescriptor::~GPURenderPassDepthAttachmentDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-double GPURenderPassDepthAttachmentDescriptor::clearDepth() const
>-{
>-    return 0;
>-}
>-
>-void GPURenderPassDepthAttachmentDescriptor::setClearDepth(double)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.h
>index 8b0ecd40761edff2f27dc69f9500f59d923e9c46..b4c517289714670fbad7582e6e590d763808281e 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassDepthAttachmentDescriptor.h
>@@ -28,40 +28,27 @@
> #if ENABLE(WEBGPU)
> 
> #include "GPURenderPassAttachmentDescriptor.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
>-#include <wtf/RetainPtr.h>
>-#include <wtf/Vector.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPassDepthAttachmentDescriptor;
>-#endif
> 
> namespace WebCore {
> 
> class GPURenderPassDepthAttachmentDescriptor : public GPURenderPassAttachmentDescriptor {
> public:
>-#if PLATFORM(COCOA)
>-    static RefPtr<GPURenderPassDepthAttachmentDescriptor> create(MTLRenderPassDepthAttachmentDescriptor *);
>-#else
>-    static RefPtr<GPURenderPassDepthAttachmentDescriptor> create();
>+#if USE(METAL)
>+    GPURenderPassDepthAttachmentDescriptor(MTLRenderPassDepthAttachmentDescriptor *);
> #endif
>-    WEBCORE_EXPORT ~GPURenderPassDepthAttachmentDescriptor();
>+    ~GPURenderPassDepthAttachmentDescriptor();
> 
>     double clearDepth() const;
>-    void setClearDepth(double);
>-
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPassDepthAttachmentDescriptor *platformRenderPassDepthAttachmentDescriptor();
>-#endif
>+    void setClearDepth(double) const;
> 
>+#if USE(METAL)
> private:
>-#if PLATFORM(COCOA)
>-    GPURenderPassDepthAttachmentDescriptor(MTLRenderPassDepthAttachmentDescriptor *);
>-#else
>-    GPURenderPassDepthAttachmentDescriptor();
>+    MTLRenderPassDepthAttachmentDescriptor *metal() const;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.cpp
>index f9f9963dae495366ce15a958c7bf0a5d4d8eb9f6..fa4abc9e1c9d2667c9897cb1f66067430a5b6c08 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.cpp
>@@ -33,24 +33,11 @@
> 
> namespace WebCore {
> 
>-RefPtr<GPURenderPassDescriptor> GPURenderPassDescriptor::create()
>-{
>-    RefPtr<GPURenderPassDescriptor> descriptor = adoptRef(new GPURenderPassDescriptor());
>-    return descriptor;
>-}
>-
> GPURenderPassDescriptor::~GPURenderPassDescriptor()
> {
>     LOG(WebGPU, "GPURenderPassDescriptor::~GPURenderPassDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-RefPtr<GPURenderPassDepthAttachmentDescriptor> GPURenderPassDescriptor::depthAttachment()
>-{
>-    return nullptr;
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.h
>index 36ac79b6ea2330be0ba0911ad0f17bb09757e081..54dae242fb5e4f8110846a8c2ad8f0cce460f802 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPassDescriptor.h
>@@ -27,40 +27,33 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/Vector.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPassDescriptor;
>-#endif
> 
> namespace WebCore {
> 
> class GPURenderPassColorAttachmentDescriptor;
> class GPURenderPassDepthAttachmentDescriptor;
> 
>-class GPURenderPassDescriptor : public RefCounted<GPURenderPassDescriptor> {
>+class GPURenderPassDescriptor {
> public:
>-    static RefPtr<GPURenderPassDescriptor> create();
>-    WEBCORE_EXPORT ~GPURenderPassDescriptor();
>+    GPURenderPassDescriptor();
>+    ~GPURenderPassDescriptor();
> 
>-    Vector<RefPtr<GPURenderPassColorAttachmentDescriptor>> colorAttachments();
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> depthAttachment();
>+    Vector<GPURenderPassColorAttachmentDescriptor> colorAttachments() const;
>+    GPURenderPassDepthAttachmentDescriptor depthAttachment() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPassDescriptor *platformRenderPassDescriptor();
>+#if USE(METAL)
>+    MTLRenderPassDescriptor *metal() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPURenderPassDescriptor();
>-
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLRenderPassDescriptor> m_renderPassDescriptor;
>+    RetainPtr<MTLRenderPassDescriptor> m_metal;
> #endif
>-    RefPtr<GPURenderPassDepthAttachmentDescriptor> m_depthAttachment;
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.cpp
>index 6af411987e243e32e1bcb24f4661542d3aab3625..a758780094411c07f71165cba214d4ca24780785 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.cpp
>@@ -28,7 +28,6 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUTexture.h"
> #include "Logging.h"
> 
> namespace WebCore {
>@@ -38,22 +37,6 @@ GPURenderPipelineColorAttachmentDescriptor::~GPURenderPipelineColorAttachmentDes
>     LOG(WebGPU, "GPURenderPipelineColorAttachmentDescriptor::~GPURenderPipelineColorAttachmentDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor()
>-{
>-    LOG(WebGPU, "GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor()");
>-}
>-
>-unsigned long GPURenderPipelineColorAttachmentDescriptor::pixelFormat() const
>-{
>-    return 0;
>-}
>-
>-void GPURenderPipelineColorAttachmentDescriptor::setPixelFormat(unsigned long)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.h
>index f1c1a705d27913b8e08a52749bbfc879355e2759..a80a5d00e6b06d3e7cc829041b89959d781ec55a 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineColorAttachmentDescriptor.h
>@@ -27,43 +27,32 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPipelineColorAttachmentDescriptor;
>-#endif
> 
> namespace WebCore {
> 
>-class GPUTexture;
>-
>-class GPURenderPipelineColorAttachmentDescriptor : public RefCounted<GPURenderPipelineColorAttachmentDescriptor> {
>+class GPURenderPipelineColorAttachmentDescriptor {
> public:
>-#if PLATFORM(COCOA)
>-    static RefPtr<GPURenderPipelineColorAttachmentDescriptor> create(MTLRenderPipelineColorAttachmentDescriptor *);
>-#else
>-    static RefPtr<GPURenderPipelineColorAttachmentDescriptor> create();
>+#if USE(METAL)
>+    GPURenderPipelineColorAttachmentDescriptor(MTLRenderPipelineColorAttachmentDescriptor *);
> #endif
>+    ~GPURenderPipelineColorAttachmentDescriptor();
> 
>-    WEBCORE_EXPORT ~GPURenderPipelineColorAttachmentDescriptor();
>+    unsigned pixelFormat() const;
>+    void setPixelFormat(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long pixelFormat() const;
>-    WEBCORE_EXPORT void setPixelFormat(unsigned long);
>-
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPipelineColorAttachmentDescriptor *platformRenderPipelineColorAttachmentDescriptor();
>+#if USE(METAL)
>+    MTLRenderPipelineColorAttachmentDescriptor *metal() const;
> #endif
> 
>-protected:
>-#if PLATFORM(COCOA)
>-    GPURenderPipelineColorAttachmentDescriptor(MTLRenderPipelineColorAttachmentDescriptor *);
>-    RetainPtr<MTLRenderPipelineColorAttachmentDescriptor> m_renderPipelineColorAttachmentDescriptor;
>-#else
>-    GPURenderPipelineColorAttachmentDescriptor();
>+#if USE(METAL)
>+private:
>+    RetainPtr<MTLRenderPipelineColorAttachmentDescriptor> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.cpp
>index 7cc89842d20372f9f1c8b04c51685369482dabbb..968cc45361eb0064235feef0dcf8a83420a5634d 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.cpp
>@@ -28,48 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUFunction.h"
>-#include "GPURenderPipelineColorAttachmentDescriptor.h"
>-#include "GPUTexture.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPURenderPipelineDescriptor> GPURenderPipelineDescriptor::create()
>-{
>-    RefPtr<GPURenderPipelineDescriptor> descriptor = adoptRef(new GPURenderPipelineDescriptor());
>-    return descriptor;
>-}
>-
> GPURenderPipelineDescriptor::~GPURenderPipelineDescriptor()
> {
>     LOG(WebGPU, "GPURenderPipelineDescriptor::~GPURenderPipelineDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-unsigned long GPURenderPipelineDescriptor::depthAttachmentPixelFormat() const
>-{
>-    return false;
>-}
>-
>-void GPURenderPipelineDescriptor::setDepthAttachmentPixelFormat(unsigned long)
>-{
>-}
>-
>-void GPURenderPipelineDescriptor::setVertexFunction(RefPtr<GPUFunction>)
>-{
>-}
>-
>-void GPURenderPipelineDescriptor::setFragmentFunction(RefPtr<GPUFunction>)
>-{
>-}
>-
>-Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>> GPURenderPipelineDescriptor::colorAttachments()
>-{
>-    return Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>>();
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.h
>index 302f1fc0c8ec005e9b21eef94881d61d97e31c2b..1fde92788f55da4fd7885182d7cab3b488e3628b 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineDescriptor.h
>@@ -27,46 +27,40 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUEnums.h"
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/Vector.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLRenderPipelineDescriptor;
>-#endif
> 
> namespace WebCore {
> 
> class GPUFunction;
> class GPURenderPipelineColorAttachmentDescriptor;
> 
>-class GPURenderPipelineDescriptor : public RefCounted<GPURenderPipelineDescriptor> {
>+class GPURenderPipelineDescriptor {
> public:
>-    static RefPtr<GPURenderPipelineDescriptor> create();
>-    WEBCORE_EXPORT ~GPURenderPipelineDescriptor();
>+    GPURenderPipelineDescriptor();
>+    ~GPURenderPipelineDescriptor();
> 
>-    WEBCORE_EXPORT void setVertexFunction(RefPtr<GPUFunction>);
>-    WEBCORE_EXPORT void setFragmentFunction(RefPtr<GPUFunction>);
>+    void setVertexFunction(const GPUFunction&) const;
>+    void setFragmentFunction(const GPUFunction&) const;
> 
>-    WEBCORE_EXPORT unsigned long depthAttachmentPixelFormat() const;
>-    WEBCORE_EXPORT void setDepthAttachmentPixelFormat(unsigned long);
>+    unsigned depthAttachmentPixelFormat() const;
>+    void setDepthAttachmentPixelFormat(unsigned) const;
> 
>-    WEBCORE_EXPORT Vector<RefPtr<GPURenderPipelineColorAttachmentDescriptor>> colorAttachments();
>+    Vector<GPURenderPipelineColorAttachmentDescriptor> colorAttachments() const;
> 
>-    WEBCORE_EXPORT void reset();
>+    void reset() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPipelineDescriptor *platformRenderPipelineDescriptor();
>+#if USE(METAL)
>+    MTLRenderPipelineDescriptor *metal() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPURenderPipelineDescriptor();
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLRenderPipelineDescriptor> m_renderPipelineDescriptor;
>+    RetainPtr<MTLRenderPipelineDescriptor> m_metal;
> #endif
> };
>-    
>+
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.cpp b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.cpp
>index 9fee38cc212023f2753d8f3cda1794aad5a45d03..69dc4105d1fe0f443d1c36b246e0f77f31af94dc 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.cpp
>@@ -28,34 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
>-#include "GPURenderPipelineDescriptor.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPURenderPipelineState> GPURenderPipelineState::create(GPUDevice* device, GPURenderPipelineDescriptor* descriptor)
>-{
>-    RefPtr<GPURenderPipelineState> state = adoptRef(new GPURenderPipelineState(device, descriptor));
>-    return state;
>-}
>-
> GPURenderPipelineState::~GPURenderPipelineState()
> {
>     LOG(WebGPU, "GPURenderPipelineState::~GPURenderPipelineState()");
> }
> 
>-#if !PLATFORM(COCOA)
>-String GPURenderPipelineState::label() const
>-{
>-    return emptyString();
>-}
>-
>-void GPURenderPipelineState::setLabel(const String&)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.h b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.h
>index 3a7a63d1c6513ebb4975a5728b28bf79b7a3d52e..c8832496e87a5df67a10898e172d06833f1c17b4 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPURenderPipelineState.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -27,39 +27,34 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
>-#include <wtf/text/WTFString.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLRenderPipelineState;
>-#endif
>+OBJC_PROTOCOL(MTLRenderPipelineState);
> 
> namespace WebCore {
> 
> class GPUDevice;
> class GPURenderPipelineDescriptor;
> 
>-class GPURenderPipelineState : public RefCounted<GPURenderPipelineState> {
>+class GPURenderPipelineState {
> public:
>-    static RefPtr<GPURenderPipelineState> create(GPUDevice*, GPURenderPipelineDescriptor*);
>-    WEBCORE_EXPORT ~GPURenderPipelineState();
>+    GPURenderPipelineState() = default;
>+    GPURenderPipelineState(const GPUDevice&, const GPURenderPipelineDescriptor&);
>+    ~GPURenderPipelineState();
> 
>-    WEBCORE_EXPORT String label() const;
>-    WEBCORE_EXPORT void setLabel(const String&);
>+    String label() const;
>+    void setLabel(const String&) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLRenderPipelineState *platformRenderPipelineState();
>+#if USE(METAL)
>+    MTLRenderPipelineState *metal() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPURenderPipelineState(GPUDevice*, GPURenderPipelineDescriptor*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLRenderPipelineState> m_renderPipelineState;
>+    RetainPtr<MTLRenderPipelineState> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUSize.h b/Source/WebCore/platform/graphics/gpu/GPUSize.h
>index f489f443eb50731c9ec0e3f02c0404f9a68f2954..3958e83bf3be8c8143b692555d8268065b9594cb 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUSize.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUSize.h
>@@ -30,10 +30,11 @@
> namespace WebCore {
>     
> struct GPUSize {
>-    unsigned long width;
>-    unsigned long height;
>-    unsigned long depth;
>+    unsigned width;
>+    unsigned height;
>+    unsigned depth;
> };
> 
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUTexture.cpp b/Source/WebCore/platform/graphics/gpu/GPUTexture.cpp
>index 47714c18039aaf3ec20ea3e00ca29a8f16fbeabf..bcc5e8a31dbe71d3326b14ab1da483e3d352bf3d 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUTexture.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUTexture.cpp
>@@ -28,41 +28,15 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include "GPUDevice.h"
>-#include "GPUDrawable.h"
> #include "Logging.h"
> 
> namespace WebCore {
> 
>-RefPtr<GPUTexture> GPUTexture::create(GPUDevice* device, GPUTextureDescriptor* descriptor)
>-{
>-    RefPtr<GPUTexture> texture = adoptRef(new GPUTexture(device, descriptor));
>-    return texture;
>-}
>-
>-RefPtr<GPUTexture> GPUTexture::createFromDrawable(GPUDrawable* other)
>-{
>-    RefPtr<GPUTexture> texture = adoptRef(new GPUTexture(other));
>-    return texture;
>-}
>-
> GPUTexture::~GPUTexture()
> {
>     LOG(WebGPU, "GPUTexture::~GPUTexture()");
> }
> 
>-#if !PLATFORM(COCOA)
>-unsigned long GPUTexture::width() const
>-{
>-    return 0;
>-}
>-
>-unsigned long GPUTexture::height() const
>-{
>-    return 0;
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUTexture.h b/Source/WebCore/platform/graphics/gpu/GPUTexture.h
>index 2894b4eadc0edd551e039beda1c71f9836593d22..d036791cee6c2e52353c98e6a851a2841336f747 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUTexture.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUTexture.h
>@@ -27,13 +27,9 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
>-OBJC_CLASS MTLTexture;
>-#endif
>+OBJC_PROTOCOL(MTLTexture);
> 
> namespace WebCore {
> 
>@@ -41,28 +37,25 @@ class GPUDevice;
> class GPUDrawable;
> class GPUTextureDescriptor;
> 
>-class GPUTexture : public RefCounted<GPUTexture> {
>+class GPUTexture {
> public:
>-    static RefPtr<GPUTexture> create(GPUDevice*, GPUTextureDescriptor*);
>-    static RefPtr<GPUTexture> createFromDrawable(GPUDrawable*);
>-
>-    WEBCORE_EXPORT ~GPUTexture();
>+    GPUTexture(const GPUDevice&, const GPUTextureDescriptor&);
>+    explicit GPUTexture(const GPUDrawable&);
>+    ~GPUTexture();
> 
>-    WEBCORE_EXPORT unsigned long width() const;
>-    WEBCORE_EXPORT unsigned long height() const;
>+    unsigned width() const;
>+    unsigned height() const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLTexture *platformTexture();
>+#if USE(METAL)
>+    MTLTexture *metal() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUTexture(GPUDevice*, GPUTextureDescriptor*);
>-    GPUTexture(GPUDrawable*);
>-    
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLTexture> m_texture;
>+    RetainPtr<MTLTexture> m_metal;
> #endif
> };
>     
> } // namespace WebCore
>+
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.cpp b/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.cpp
>index 80ce12dd7ef0c8d4c35cf548d740a5335bfbd0f8..df675a4cd1494cae62060b7392e4d906a6dce6c9 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.cpp
>+++ b/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.cpp
>@@ -32,73 +32,11 @@
> 
> namespace WebCore {
> 
>-RefPtr<GPUTextureDescriptor> GPUTextureDescriptor::create(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped)
>-{
>-    RefPtr<GPUTextureDescriptor> descriptor = adoptRef(new GPUTextureDescriptor(pixelFormat, width, height, mipmapped));
>-    return descriptor;
>-}
>-
> GPUTextureDescriptor::~GPUTextureDescriptor()
> {
>     LOG(WebGPU, "GPUTextureDescriptor::~GPUTextureDescriptor()");
> }
> 
>-#if !PLATFORM(COCOA)
>-unsigned long GPUTextureDescriptor::width() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setWidth(unsigned long)
>-{
>-}
>-
>-unsigned long GPUTextureDescriptor::height() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setHeight(unsigned long)
>-{
>-}
>-
>-unsigned long GPUTextureDescriptor::sampleCount() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setSampleCount(unsigned long)
>-{
>-}
>-
>-unsigned long GPUTextureDescriptor::textureType() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setTextureType(unsigned long)
>-{
>-}
>-
>-unsigned long GPUTextureDescriptor::storageMode() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setStorageMode(unsigned long)
>-{
>-}
>-
>-unsigned long GPUTextureDescriptor::usage() const
>-{
>-    return 0;
>-}
>-
>-void GPUTextureDescriptor::setUsage(unsigned long)
>-{
>-}
>-#endif
>-
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.h b/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.h
>index 7e21ba28a86c6c0099170230d54bca5bd1bf4e9b..24111fcfaf26c457c0052bbb5e8bf7d11ed53362 100644
>--- a/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.h
>+++ b/Source/WebCore/platform/graphics/gpu/GPUTextureDescriptor.h
>@@ -27,48 +27,42 @@
> 
> #if ENABLE(WEBGPU)
> 
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/RetainPtr.h>
> 
>-#if PLATFORM(COCOA)
> OBJC_CLASS MTLTextureDescriptor;
>-#endif
> 
> namespace WebCore {
> 
>-class GPUTextureDescriptor : public RefCounted<GPUTextureDescriptor> {
>+class GPUTextureDescriptor {
> public:
>-    static RefPtr<GPUTextureDescriptor> create(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped);
>-    WEBCORE_EXPORT ~GPUTextureDescriptor();
>+    GPUTextureDescriptor(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped);
>+    ~GPUTextureDescriptor();
> 
>-    WEBCORE_EXPORT unsigned long width() const;
>-    WEBCORE_EXPORT void setWidth(unsigned long);
>+    unsigned width() const;
>+    void setWidth(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long height() const;
>-    WEBCORE_EXPORT void setHeight(unsigned long);
>+    unsigned height() const;
>+    void setHeight(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long sampleCount() const;
>-    WEBCORE_EXPORT void setSampleCount(unsigned long);
>+    unsigned sampleCount() const;
>+    void setSampleCount(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long textureType() const;
>-    WEBCORE_EXPORT void setTextureType(unsigned long);
>+    unsigned textureType() const;
>+    void setTextureType(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long storageMode() const;
>-    WEBCORE_EXPORT void setStorageMode(unsigned long);
>+    unsigned storageMode() const;
>+    void setStorageMode(unsigned) const;
> 
>-    WEBCORE_EXPORT unsigned long usage() const;
>-    WEBCORE_EXPORT void setUsage(unsigned long);
>+    unsigned usage() const;
>+    void setUsage(unsigned) const;
> 
>-#if PLATFORM(COCOA)
>-    WEBCORE_EXPORT MTLTextureDescriptor *platformTextureDescriptor();
>+#if USE(METAL)
>+    MTLTextureDescriptor *metal() const;
> #endif
> 
>+#if USE(METAL)
> private:
>-    GPUTextureDescriptor(unsigned long pixelFormat, unsigned long width, unsigned long height, bool mipmapped);
>-
>-#if PLATFORM(COCOA)
>-    RetainPtr<MTLTextureDescriptor> m_textureDescriptor;
>+    RetainPtr<MTLTextureDescriptor> m_metal;
> #endif
> };
>     
>diff --git a/Source/WebCore/platform/graphics/metal/GPUBufferMetal.mm b/Source/WebCore/platform/graphics/metal/GPUBufferMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..4a119c7d9f4fc59e6c964d2fbea03b2753ccbbcd
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUBufferMetal.mm
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUBuffer.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "Logging.h"
>+#import <JavaScriptCore/ArrayBufferView.h>
>+#import <Metal/Metal.h>
>+#import <wtf/Gigacage.h>
>+#import <wtf/PageBlock.h>
>+
>+namespace WebCore {
>+
>+GPUBuffer::GPUBuffer(const GPUDevice& device, const JSC::ArrayBufferView& data)
>+{
>+    LOG(WebGPU, "GPUBuffer::GPUBuffer()");
>+
>+    if (!device.metal())
>+        return;
>+    
>+    size_t pageSize = WTF::pageSize();
>+    size_t pageAlignedSize = roundUpToMultipleOf(pageSize, data.byteLength());
>+    void* pageAlignedCopy = Gigacage::tryAlignedMalloc(Gigacage::Primitive, pageSize, pageAlignedSize);
>+    if (!pageAlignedCopy)
>+        return;
>+    memcpy(pageAlignedCopy, data.baseAddress(), data.byteLength());
>+    m_contents = ArrayBuffer::createFromBytes(pageAlignedCopy, data.byteLength(), [] (void* ptr) {
>+        Gigacage::alignedFree(Gigacage::Primitive, ptr);
>+    });
>+    m_contents->ref();
>+    ArrayBuffer* capturedContents = m_contents.get();
>+    m_metal = adoptNS([device.metal() newBufferWithBytesNoCopy:m_contents->data() length:pageAlignedSize options:MTLResourceOptionCPUCacheModeDefault deallocator:^(void*, NSUInteger) {
>+        capturedContents->deref();
>+    }]);
>+    if (!m_metal) {
>+        m_contents->deref();
>+        m_contents = nullptr;
>+    }
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUCommandBufferMetal.mm b/Source/WebCore/platform/graphics/metal/GPUCommandBufferMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..ff16dbd495e30c7a863674fe0dd92de3c3ec3607
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUCommandBufferMetal.mm
>@@ -0,0 +1,66 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUCommandBuffer.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUCommandQueue.h"
>+#import "GPUDrawable.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/BlockPtr.h>
>+#import <wtf/MainThread.h>
>+
>+namespace WebCore {
>+
>+GPUCommandBuffer::GPUCommandBuffer(const GPUCommandQueue& queue, Function<void()>&& completedCallback)
>+    : m_metal { [queue.metal() commandBuffer] }
>+{
>+    LOG(WebGPU, "GPUCommandBuffer::GPUCommandBuffer()");
>+
>+    [m_metal addCompletedHandler:BlockPtr<void (id<MTLCommandBuffer>)>::fromCallable([&completedCallback] (id<MTLCommandBuffer>) {
>+        callOnMainThread(WTFMove(completedCallback));
>+    }).get()];
>+}
>+
>+void GPUCommandBuffer::presentDrawable(GPUDrawable& drawable) const
>+{
>+    if (!m_metal || !drawable.metal())
>+        return;
>+
>+    [m_metal presentDrawable:drawable.metal()];
>+    drawable.release();
>+}
>+
>+void GPUCommandBuffer::commit() const
>+{
>+    [m_metal commit];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUCommandQueueMetal.mm b/Source/WebCore/platform/graphics/metal/GPUCommandQueueMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..820af8bc16db3b4865e79b7b824db2c7b4df3ecc
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUCommandQueueMetal.mm
>@@ -0,0 +1,72 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUCommandQueue.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+static NSString * const commandQueueDefaultLabel = @"com.apple.WebKit";
>+static NSString * const commandQueueLabelPrefix = @"com.apple.WebKit.";
>+
>+GPUCommandQueue::GPUCommandQueue(const GPUDevice& device)
>+    : m_metal { adoptNS([device.metal() newCommandQueue]) }
>+{
>+    LOG(WebGPU, "GPUCommandQueue::GPUCommandQueue()");
>+
>+    [m_metal setLabel:commandQueueDefaultLabel];
>+}
>+
>+String GPUCommandQueue::label() const
>+{
>+    if (!m_metal)
>+        return emptyString();
>+
>+    NSString *prefixedLabel = [m_metal label];
>+
>+    if ([prefixedLabel isEqualToString:commandQueueDefaultLabel])
>+        return emptyString();
>+
>+    ASSERT(prefixedLabel.length > commandQueueLabelPrefix.length);
>+    return [prefixedLabel substringFromIndex:commandQueueLabelPrefix.length];
>+}
>+
>+void GPUCommandQueue::setLabel(const String& label) const
>+{
>+    if (label.isEmpty())
>+        [m_metal setLabel:commandQueueDefaultLabel];
>+    else
>+        [m_metal setLabel:[commandQueueLabelPrefix stringByAppendingString:label]];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUComputeCommandEncoderMetal.mm b/Source/WebCore/platform/graphics/metal/GPUComputeCommandEncoderMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..1a05bbdb9e78a27069341690e35470fa579ea492
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUComputeCommandEncoderMetal.mm
>@@ -0,0 +1,79 @@
>+/*
>+ * Copyright (C) 2017 Yuichiro Kikura (y.kikura@gmail.com)
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUComputeCommandEncoder.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUBuffer.h"
>+#import "GPUCommandBuffer.h"
>+#import "GPUComputePipelineState.h"
>+#import "GPUSize.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+static inline MTLSize MTLSizeMake(GPUSize size)
>+{
>+    return { size.width, size.height, size.depth };
>+}
>+
>+GPUComputeCommandEncoder::GPUComputeCommandEncoder(const GPUCommandBuffer& buffer)
>+    : m_metal { [buffer.metal() computeCommandEncoder] }
>+{
>+    LOG(WebGPU, "GPUComputeCommandEncoder::GPUComputeCommandEncoder()");
>+}
>+
>+void GPUComputeCommandEncoder::setComputePipelineState(const GPUComputePipelineState& computePipelineState) const
>+{
>+    if (!computePipelineState.metal())
>+        return;
>+
>+    [m_metal setComputePipelineState:computePipelineState.metal()];
>+}
>+    
>+void GPUComputeCommandEncoder::setBuffer(const GPUBuffer& buffer, unsigned offset, unsigned index) const
>+{
>+    if (!buffer.metal())
>+        return;
>+
>+    [m_metal setBuffer:buffer.metal() offset:offset atIndex:index];
>+}
>+    
>+void GPUComputeCommandEncoder::dispatch(GPUSize threadgroupsPerGrid, GPUSize threadsPerThreadgroup) const
>+{
>+    [m_metal dispatchThreadgroups:MTLSizeMake(threadgroupsPerGrid) threadsPerThreadgroup:MTLSizeMake(threadsPerThreadgroup)];
>+}
>+
>+void GPUComputeCommandEncoder::endEncoding() const
>+{
>+    [m_metal endEncoding];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUComputePipelineStateMetal.mm b/Source/WebCore/platform/graphics/metal/GPUComputePipelineStateMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..501beee7d1c4c3b4a2fc7ef03a0da9e59059b61b
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUComputePipelineStateMetal.mm
>@@ -0,0 +1,50 @@
>+/*
>+ * Copyright (C) 2017 Yuichiro Kikura (y.kikura@gmail.com)
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUComputePipelineState.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "GPUFunction.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPUComputePipelineState::GPUComputePipelineState(const GPUDevice& device, const GPUFunction& function)
>+{
>+    LOG(WebGPU, "GPUComputePipelineState::GPUComputePipelineState()");
>+
>+    if (!function.metal())
>+        return;
>+
>+    m_metal = adoptNS([device.metal() newComputePipelineStateWithFunction:function.metal() error:nil]);
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..d4a9882cd2910d5fb6c3781dcff9b7930a222b2f
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUDepthStencilDescriptorMetal.mm
>@@ -0,0 +1,66 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUDepthStencilDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUEnums.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPUDepthStencilDescriptor::GPUDepthStencilDescriptor()
>+    : m_metal { adoptNS([MTLDepthStencilDescriptor new]) }
>+{
>+    LOG(WebGPU, "GPUDepthStencilDescriptor::GPUDepthStencilDescriptor()");
>+}
>+
>+bool GPUDepthStencilDescriptor::depthWriteEnabled() const
>+{
>+    return [m_metal isDepthWriteEnabled];
>+}
>+
>+void GPUDepthStencilDescriptor::setDepthWriteEnabled(bool newDepthWriteEnabled) const
>+{
>+    [m_metal setDepthWriteEnabled:newDepthWriteEnabled];
>+}
>+
>+GPUCompareFunction GPUDepthStencilDescriptor::depthCompareFunction() const
>+{
>+    return static_cast<GPUCompareFunction>([m_metal depthCompareFunction]);
>+}
>+
>+void GPUDepthStencilDescriptor::setDepthCompareFunction(GPUCompareFunction newFunction) const
>+{
>+    // FIXME: Do we need to check if the function value is in range before casting to MTLCompareFunction?
>+    [m_metal setDepthCompareFunction:static_cast<MTLCompareFunction>(newFunction)];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUDepthStencilStateMetal.mm b/Source/WebCore/platform/graphics/metal/GPUDepthStencilStateMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..725f25ae63430540eb0aa893fbfa007156287445
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUDepthStencilStateMetal.mm
>@@ -0,0 +1,62 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUDepthStencilState.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDepthStencilDescriptor.h"
>+#import "GPUDevice.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+GPUDepthStencilState::GPUDepthStencilState(const GPUDevice& device, const GPUDepthStencilDescriptor& descriptor)
>+    : m_metal { adoptNS([device.metal() newDepthStencilStateWithDescriptor:descriptor.metal()]) }
>+{
>+    LOG(WebGPU, "GPUDepthStencilState::GPUDepthStencilState()");
>+}
>+
>+String GPUDepthStencilState::label() const
>+{
>+    if (!m_metal)
>+        return emptyString();
>+
>+    return [m_metal label];
>+}
>+
>+void GPUDepthStencilState::setLabel(const String&) const
>+{
>+    // FIXME: The MTLDepthStencilState protocol does not allow setting the label.
>+    // The label has to be set on the descriptor when creating the state object.
>+    // We should consider changing the WebGPU interface to not require this!
>+}
>+    
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUDeviceMetal.mm b/Source/WebCore/platform/graphics/metal/GPUDeviceMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..8addfe9accfc7d949dd6c9e0f5988b853b1022ce
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUDeviceMetal.mm
>@@ -0,0 +1,90 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUDevice.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "Logging.h"
>+#import "WebGPULayer.h"
>+#import <JavaScriptCore/ArrayBuffer.h>
>+#import <Metal/Metal.h>
>+#import <wtf/BlockObjCExceptions.h>
>+
>+namespace WebCore {
>+
>+GPUDevice::GPUDevice()
>+    : m_metal { adoptNS(MTLCreateSystemDefaultDevice()) }
>+{
>+
>+    if (!m_metal) {
>+        LOG(WebGPU, "GPUDevice::GPUDevice -- could not create the device. This usually means Metal is not available on this hardware.");
>+        return;
>+    }
>+
>+    LOG(WebGPU, "GPUDevice::GPUDevice Metal device is %p", m_metal.get());
>+
>+    BEGIN_BLOCK_OBJC_EXCEPTIONS
>+
>+    m_layer = adoptNS([[WebGPULayer alloc] initWithGPUDevice:this]);
>+    [m_layer setOpaque:0];
>+    [m_layer setName:@"WebGPU Layer"];
>+
>+    // FIXME: WebGPU - Should this be in the WebGPULayer initializer?
>+    [m_layer setDevice:m_metal.get()];
>+    [m_layer setPixelFormat:MTLPixelFormatBGRA8Unorm];
>+    [m_layer setFramebufferOnly:YES];
>+
>+    END_BLOCK_OBJC_EXCEPTIONS
>+}
>+
>+void GPUDevice::disconnect()
>+{
>+    m_layer.get().context = nullptr;
>+    // FIXME: Should we also clear out the device property, which has the MTLDevice?
>+}
>+
>+void GPUDevice::reshape(int width, int height) const
>+{
>+    [m_layer setBounds:CGRectMake(0, 0, width, height)];
>+    [m_layer setDrawableSize:CGSizeMake(width, height)];
>+
>+    // FIXME: WebGPU - Lots of reshape stuff should go here. See GC3D.
>+}
>+
>+CALayer *GPUDevice::platformLayer() const
>+{
>+    return m_layer.get();
>+}
>+
>+bool GPUDevice::operator!() const
>+{
>+    return !m_metal;
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUDrawableMetal.mm b/Source/WebCore/platform/graphics/metal/GPUDrawableMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..2b09ffd05f10aa9852b07bc67637c4ddd2c72c5c
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUDrawableMetal.mm
>@@ -0,0 +1,66 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUDrawable.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <QuartzCore/QuartzCore.h>
>+
>+namespace WebCore {
>+
>+GPUDrawable::GPUDrawable(const GPUDevice& device)
>+    : m_metal { [device.layer() nextDrawable] }
>+{
>+    LOG(WebGPU, "GPUDrawable::GPUDrawable()");
>+}
>+
>+void GPUDrawable::release()
>+{
>+    LOG(WebGPU, "GPUDrawable::release()");
>+    m_metal = nil;
>+}
>+    
>+MTLDrawable *GPUDrawable::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+MTLTexture *GPUDrawable::texture() const
>+{
>+    if (![m_metal conformsToProtocol:@protocol(CAMetalDrawable)]) {
>+        ASSERT(!m_metal);
>+        return nil;
>+    }
>+    return [(id<CAMetalDrawable>)m_metal.get() texture];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUFunctionMetal.mm b/Source/WebCore/platform/graphics/metal/GPUFunctionMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..08232099af658e994faa9c81580798d237f3724a
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUFunctionMetal.mm
>@@ -0,0 +1,59 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUFunction.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPULibrary.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+GPUFunction::GPUFunction(const GPULibrary& library, const String& name)
>+    : m_metal { adoptNS([library.metal() newFunctionWithName:name]) }
>+{
>+    LOG(WebGPU, "GPUFunction::GPUFunction()");
>+}
>+
>+String GPUFunction::name() const
>+{
>+    if (!m_metal)
>+        return emptyString();
>+
>+    return [m_metal name];
>+}
>+
>+bool GPUFunction::operator!() const
>+{
>+    return !m_metal;
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPULibraryMetal.mm b/Source/WebCore/platform/graphics/metal/GPULibraryMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..8ae887af2860e93a9ef0c7682efadefcb094bb76
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPULibraryMetal.mm
>@@ -0,0 +1,78 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPULibrary.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/Vector.h>
>+#import <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+GPULibrary::GPULibrary(const GPUDevice& device, const String& sourceCode)
>+{
>+    LOG(WebGPU, "GPULibrary::GPULibrary()");
>+
>+    if (!device.metal())
>+        return;
>+
>+    NSError *error = [NSError errorWithDomain:@"com.apple.WebKit.GPU" code:1 userInfo:nil];
>+    m_metal = adoptNS([device.metal() newLibraryWithSource:sourceCode options:nil error:&error]);
>+    if (!m_metal)
>+        LOG(WebGPU, "Compilation error: %s", [[error localizedDescription] UTF8String]);
>+}
>+
>+String GPULibrary::label() const
>+{
>+    if (!m_metal)
>+        return emptyString();
>+
>+    return [m_metal label];
>+}
>+
>+void GPULibrary::setLabel(const String& label) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setLabel:label];
>+}
>+
>+Vector<String> GPULibrary::functionNames() const
>+{
>+    auto array = [m_metal functionNames];
>+    Vector<String> vector;
>+    vector.reserveInitialCapacity(array.count);
>+    for (NSString *string in array)
>+        vector.uncheckedAppend(string);
>+    return vector;
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderCommandEncoderMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderCommandEncoderMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..c1e62b3e17a6f21c747633b498799aa62f85c3dc
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderCommandEncoderMetal.mm
>@@ -0,0 +1,99 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderCommandEncoder.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUBuffer.h"
>+#import "GPUCommandBuffer.h"
>+#import "GPUDepthStencilState.h"
>+#import "GPURenderPassDescriptor.h"
>+#import "GPURenderPipelineState.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPURenderCommandEncoder::GPURenderCommandEncoder(const GPUCommandBuffer& buffer, const GPURenderPassDescriptor& descriptor)
>+{
>+    LOG(WebGPU, "GPURenderCommandEncoder::GPURenderCommandEncoder()");
>+
>+    if (!descriptor.metal())
>+        return;
>+
>+    m_metal = [buffer.metal() renderCommandEncoderWithDescriptor:descriptor.metal()];
>+}
>+
>+void GPURenderCommandEncoder::setRenderPipelineState(const GPURenderPipelineState& renderPipelineState) const
>+{
>+    if (!renderPipelineState.metal())
>+        return;
>+
>+    [m_metal setRenderPipelineState:renderPipelineState.metal()];
>+}
>+
>+void GPURenderCommandEncoder::setDepthStencilState(const GPUDepthStencilState& depthStencilState) const
>+{
>+    if (!depthStencilState.metal())
>+        return;
>+
>+    [m_metal setDepthStencilState:depthStencilState.metal()];
>+}
>+
>+void GPURenderCommandEncoder::setVertexBuffer(const GPUBuffer& buffer, unsigned offset, unsigned index) const
>+{
>+    if (!buffer.metal())
>+        return;
>+
>+    [m_metal setVertexBuffer:buffer.metal() offset:offset atIndex:index];
>+}
>+
>+void GPURenderCommandEncoder::setFragmentBuffer(const GPUBuffer& buffer, unsigned offset, unsigned index) const
>+{
>+    if (!buffer.metal())
>+        return;
>+
>+    [m_metal setFragmentBuffer:buffer.metal() offset:offset atIndex:index];
>+}
>+
>+void GPURenderCommandEncoder::drawPrimitives(unsigned type, unsigned start, unsigned count) const
>+{
>+    // FIXME: Why do we need a specially optimized path for count of 0?
>+    if (!count)
>+        return;
>+
>+    [m_metal drawPrimitives:static_cast<MTLPrimitiveType>(type) vertexStart:start vertexCount:count];
>+}
>+
>+void GPURenderCommandEncoder::endEncoding() const
>+{
>+    [m_metal endEncoding];
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..730e70f37865eca44e85fa0fb5bc491b00e6f270
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPassAttachmentDescriptorMetal.mm
>@@ -0,0 +1,78 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPassAttachmentDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUTexture.h"
>+#import "Logging.h"
>+
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor(MTLRenderPassAttachmentDescriptor *metal)
>+    : m_metal { metal }
>+{
>+    LOG(WebGPU, "GPURenderPassAttachmentDescriptor::GPURenderPassAttachmentDescriptor()");
>+}
>+
>+unsigned GPURenderPassAttachmentDescriptor::loadAction() const
>+{
>+    return [m_metal loadAction];
>+}
>+
>+void GPURenderPassAttachmentDescriptor::setLoadAction(unsigned newLoadAction) const
>+{
>+    // FIXME: Should this range check for legitimate values?
>+    [m_metal setLoadAction:static_cast<MTLLoadAction>(newLoadAction)];
>+}
>+
>+unsigned GPURenderPassAttachmentDescriptor::storeAction() const
>+{
>+    return [m_metal storeAction];
>+}
>+
>+void GPURenderPassAttachmentDescriptor::setStoreAction(unsigned newStoreAction) const
>+{
>+    // FIXME: Should this range check for legitimate values?
>+    [m_metal setStoreAction:static_cast<MTLStoreAction>(newStoreAction)];
>+}
>+
>+void GPURenderPassAttachmentDescriptor::setTexture(const GPUTexture& texture) const
>+{
>+    [m_metal setTexture:texture.metal()];
>+}
>+
>+MTLRenderPassAttachmentDescriptor *GPURenderPassAttachmentDescriptor::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..1f5a36953249a26376a5ba58f0ecb288166aaa04
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPassColorAttachmentDescriptorMetal.mm
>@@ -0,0 +1,69 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPassColorAttachmentDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "FloatConversion.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor(MTLRenderPassColorAttachmentDescriptor *metal)
>+    : GPURenderPassAttachmentDescriptor { metal }
>+{
>+    LOG(WebGPU, "GPURenderPassColorAttachmentDescriptor::GPURenderPassColorAttachmentDescriptor()");
>+}
>+
>+Vector<float> GPURenderPassColorAttachmentDescriptor::clearColor() const
>+{
>+    auto* metal = this->metal();
>+    if (!metal)
>+        return { };
>+
>+    auto color = [metal clearColor];
>+    return { narrowPrecisionToFloat(color.red), narrowPrecisionToFloat(color.green), narrowPrecisionToFloat(color.blue), narrowPrecisionToFloat(color.alpha) };
>+}
>+
>+void GPURenderPassColorAttachmentDescriptor::setClearColor(const Vector<float>& newClearColor) const
>+{
>+    if (newClearColor.size() != 4)
>+        return;
>+
>+    [metal() setClearColor:MTLClearColorMake(newClearColor[0], newClearColor[1], newClearColor[2], newClearColor[3])];
>+}
>+
>+MTLRenderPassColorAttachmentDescriptor *GPURenderPassColorAttachmentDescriptor::metal() const
>+{
>+    return static_cast<MTLRenderPassColorAttachmentDescriptor *>(GPURenderPassAttachmentDescriptor::metal());
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..3765b1a2a949d612a83c0e09fa5ff0ff75a8a785
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPassDepthAttachmentDescriptorMetal.mm
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPassDepthAttachmentDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPURenderPassAttachmentDescriptor.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor(MTLRenderPassDepthAttachmentDescriptor *metal)
>+    : GPURenderPassAttachmentDescriptor { metal }
>+{
>+    LOG(WebGPU, "GPURenderPassDepthAttachmentDescriptor::GPURenderPassDepthAttachmentDescriptor()");
>+}
>+
>+double GPURenderPassDepthAttachmentDescriptor::clearDepth() const
>+{
>+    auto* metal = this->metal();
>+    if (!metal)
>+        return 0;
>+
>+    return [metal clearDepth];
>+}
>+
>+void GPURenderPassDepthAttachmentDescriptor::setClearDepth(double newClearDepth) const
>+{
>+    [metal() setClearDepth:newClearDepth];
>+}
>+
>+MTLRenderPassDepthAttachmentDescriptor *GPURenderPassDepthAttachmentDescriptor::metal() const
>+{
>+    return static_cast<MTLRenderPassDepthAttachmentDescriptor *>(GPURenderPassAttachmentDescriptor::metal());
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPassDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPassDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..33566acfae5367f3197c793ffaae361d39b9d854
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPassDescriptorMetal.mm
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPassDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPURenderPassColorAttachmentDescriptor.h"
>+#import "GPURenderPassDepthAttachmentDescriptor.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPURenderPassDescriptor::GPURenderPassDescriptor()
>+    : m_metal { adoptNS([MTLRenderPassDescriptor new]) }
>+{
>+    LOG(WebGPU, "GPURenderPassDescriptor::GPURenderPassDescriptor()");
>+}
>+
>+Vector<GPURenderPassColorAttachmentDescriptor> GPURenderPassDescriptor::colorAttachments() const
>+{
>+    if (!m_metal)
>+        return { };
>+
>+    // FIXME: Why is it correct to return one color here?
>+    return { { [[m_metal colorAttachments] objectAtIndexedSubscript:0] } };
>+}
>+
>+GPURenderPassDepthAttachmentDescriptor GPURenderPassDescriptor::depthAttachment() const
>+{
>+    return [m_metal depthAttachment];
>+}
>+
>+MTLRenderPassDescriptor *GPURenderPassDescriptor::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..db8e52d6fc971ef7f2524382dfe7f6676480f17f
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPipelineColorAttachmentDescriptorMetal.mm
>@@ -0,0 +1,60 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPipelineColorAttachmentDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor(MTLRenderPipelineColorAttachmentDescriptor *metal)
>+    : m_metal { metal }
>+{
>+    LOG(WebGPU, "GPURenderPipelineColorAttachmentDescriptor::GPURenderPipelineColorAttachmentDescriptor()");
>+}
>+
>+unsigned GPURenderPipelineColorAttachmentDescriptor::pixelFormat() const
>+{
>+    return [m_metal pixelFormat];
>+}
>+
>+void GPURenderPipelineColorAttachmentDescriptor::setPixelFormat(unsigned newPixelFormat) const
>+{
>+    // FIXME: Should we check for enumeration values out of range before calling the method?
>+    [m_metal setPixelFormat:static_cast<MTLPixelFormat>(newPixelFormat)];
>+}
>+
>+MTLRenderPipelineColorAttachmentDescriptor *GPURenderPipelineColorAttachmentDescriptor::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..26333776b0a8b89c83a534da39972b170573ec61
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPipelineDescriptorMetal.mm
>@@ -0,0 +1,83 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPipelineDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUFunction.h"
>+#import "GPURenderPipelineColorAttachmentDescriptor.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/Vector.h>
>+
>+namespace WebCore {
>+
>+GPURenderPipelineDescriptor::GPURenderPipelineDescriptor()
>+    : m_metal { adoptNS([MTLRenderPipelineDescriptor new]) }
>+{
>+    LOG(WebGPU, "GPURenderPipelineDescriptor::GPURenderPipelineDescriptor()");
>+}
>+
>+unsigned GPURenderPipelineDescriptor::depthAttachmentPixelFormat() const
>+{
>+    return [m_metal depthAttachmentPixelFormat];
>+}
>+
>+void GPURenderPipelineDescriptor::setDepthAttachmentPixelFormat(unsigned newPixelFormat) const
>+{
>+    [m_metal setDepthAttachmentPixelFormat:static_cast<MTLPixelFormat>(newPixelFormat)];
>+}
>+
>+void GPURenderPipelineDescriptor::setVertexFunction(const GPUFunction& newFunction) const
>+{
>+    [m_metal setVertexFunction:newFunction.metal()];
>+}
>+
>+void GPURenderPipelineDescriptor::setFragmentFunction(const GPUFunction& newFunction) const
>+{
>+    [m_metal setFragmentFunction:newFunction.metal()];
>+}
>+
>+Vector<GPURenderPipelineColorAttachmentDescriptor> GPURenderPipelineDescriptor::colorAttachments() const
>+{
>+    // FIXME: Why is it always OK to return exactly one attachment?
>+    return { { [[m_metal colorAttachments] objectAtIndexedSubscript:0] } };
>+}
>+
>+void GPURenderPipelineDescriptor::reset() const
>+{
>+    [m_metal reset];
>+}
>+
>+MTLRenderPipelineDescriptor *GPURenderPipelineDescriptor::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPURenderPipelineStateMetal.mm b/Source/WebCore/platform/graphics/metal/GPURenderPipelineStateMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..ee7798683c2ca1f7c7a2371046c45f38f54d2fd1
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPURenderPipelineStateMetal.mm
>@@ -0,0 +1,66 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPURenderPipelineState.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "GPURenderPipelineDescriptor.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+#import <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+GPURenderPipelineState::GPURenderPipelineState(const GPUDevice& device, const GPURenderPipelineDescriptor& descriptor)
>+    : m_metal { adoptNS([device.metal() newRenderPipelineStateWithDescriptor:descriptor.metal() error:nil]) }
>+{
>+    LOG(WebGPU, "GPURenderPipelineState::GPURenderPipelineState()");
>+}
>+
>+String GPURenderPipelineState::label() const
>+{
>+    if (!m_metal)
>+        return emptyString();
>+    return [m_metal label];
>+}
>+
>+void GPURenderPipelineState::setLabel(const String&) const
>+{
>+    // FIXME: The MTLRenderPipelineState protocol does not allow setting the label.
>+    // The label has to be set on the descriptor when creating the state object.
>+    // We should consider changing the WebGPU interface to not require this!
>+}
>+    
>+MTLRenderPipelineState *GPURenderPipelineState::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUTextureDescriptorMetal.mm b/Source/WebCore/platform/graphics/metal/GPUTextureDescriptorMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..732806f7425244c9e4af6b527b748811d003fb9f
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUTextureDescriptorMetal.mm
>@@ -0,0 +1,114 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUTextureDescriptor.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPUTextureDescriptor::GPUTextureDescriptor(unsigned pixelFormat, unsigned width, unsigned height, bool mipmapped)
>+    : m_metal { [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:static_cast<MTLPixelFormat>(pixelFormat) width:width height:height mipmapped:mipmapped] }
>+{
>+    LOG(WebGPU, "GPUTextureDescriptor::GPUTextureDescriptor()");
>+}
>+
>+unsigned GPUTextureDescriptor::width() const
>+{
>+    return [m_metal width];
>+}
>+
>+void GPUTextureDescriptor::setWidth(unsigned newWidth) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setWidth:newWidth];
>+}
>+
>+unsigned GPUTextureDescriptor::height() const
>+{
>+    return [m_metal height];
>+}
>+
>+void GPUTextureDescriptor::setHeight(unsigned newHeight) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setHeight:newHeight];
>+}
>+
>+unsigned GPUTextureDescriptor::sampleCount() const
>+{
>+    return [m_metal sampleCount];
>+}
>+
>+void GPUTextureDescriptor::setSampleCount(unsigned newSampleCount) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setSampleCount:newSampleCount];
>+}
>+
>+unsigned GPUTextureDescriptor::textureType() const
>+{
>+    return [m_metal textureType];
>+}
>+
>+void GPUTextureDescriptor::setTextureType(unsigned newTextureType) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setTextureType:static_cast<MTLTextureType>(newTextureType)];
>+}
>+
>+unsigned GPUTextureDescriptor::storageMode() const
>+{
>+    return [m_metal storageMode];
>+}
>+
>+void GPUTextureDescriptor::setStorageMode(unsigned newStorageMode) const
>+{
>+    [m_metal setStorageMode:static_cast<MTLStorageMode>(newStorageMode)];
>+}
>+
>+unsigned GPUTextureDescriptor::usage() const
>+{
>+    return [m_metal usage];
>+}
>+
>+void GPUTextureDescriptor::setUsage(unsigned newUsage) const
>+{
>+    ASSERT(m_metal);
>+    [m_metal setUsage:newUsage];
>+}
>+
>+MTLTextureDescriptor *GPUTextureDescriptor::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Source/WebCore/platform/graphics/metal/GPUTextureMetal.mm b/Source/WebCore/platform/graphics/metal/GPUTextureMetal.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..1107fc3bc2d1c7d8197904369849322581362270
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/metal/GPUTextureMetal.mm
>@@ -0,0 +1,72 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "GPUTexture.h"
>+
>+#if ENABLE(WEBGPU)
>+
>+#import "GPUDevice.h"
>+#import "GPUDrawable.h"
>+#import "GPUTextureDescriptor.h"
>+#import "Logging.h"
>+#import <Metal/Metal.h>
>+
>+namespace WebCore {
>+
>+GPUTexture::GPUTexture(const GPUDevice& device, const GPUTextureDescriptor& descriptor)
>+{
>+    LOG(WebGPU, "GPUTexture::GPUTexture()");
>+
>+    if (!descriptor.metal())
>+        return;
>+
>+    m_metal = adoptNS([device.metal() newTextureWithDescriptor:descriptor.metal()]);
>+}
>+
>+GPUTexture::GPUTexture(const GPUDrawable& other)
>+    : m_metal { other.texture() }
>+{
>+    LOG(WebGPU, "GPUTexture::GPUTexture()");
>+}
>+
>+unsigned GPUTexture::width() const
>+{
>+    return m_metal.get().width;
>+}
>+
>+unsigned GPUTexture::height() const
>+{
>+    return m_metal.get().height;
>+}
>+
>+MTLTexture *GPUTexture::metal() const
>+{
>+    return m_metal.get();
>+}
>+
>+} // namespace WebCore
>+
>+#endif
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 1db6131902bc6228836d892e837fd76fb4c0c918..ab398e36d03c0c1d9ad29bd8d19cc706ad778674 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,16 @@
>+2018-07-04  Darin Adler  <darin@apple.com>
>+
>+        Improve WebGPU implementation, including using Metal Objective-C protocols more simply and correctly
>+        https://bugs.webkit.org/show_bug.cgi?id=187333
>+
>+        Reviewed by Sam Weinig.
>+
>+        * TestWebKitAPI/Tests/WebCore/mac/GPUBuffer.mm: Updated.
>+        * TestWebKitAPI/Tests/WebCore/mac/GPUCommandQueue.mm: Updated.
>+        * TestWebKitAPI/Tests/WebCore/mac/GPUDevice.mm: Updated.
>+        * TestWebKitAPI/Tests/WebCore/mac/GPUFunction.mm: Updated.
>+        * TestWebKitAPI/Tests/WebCore/mac/GPULibrary.mm: Updated.
>+
> 2018-07-25  Aakash Jain  <aakash_jain@apple.com>
> 
>         [ews-build] Add build steps DownloadBuiltProduct and ExtractBuiltProduct
>diff --git a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUBuffer.mm b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUBuffer.mm
>index 5ef1ba5dc61567acef323fdd1acf37f9433ccab3..7fe3eb6b872331ddbe43b91ab7c5298277671384 100644
>--- a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUBuffer.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUBuffer.mm
>@@ -44,39 +44,35 @@ namespace TestWebKitAPI {
> 
> TEST_F(GPU, BufferCreate)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>+
>     // Not all hardware supports Metal, so it is possible
>     // that we were unable to create the MTLDevice object.
>     // In that case, the device should be null.
>     if (!device)
>         return;
> 
>-    id<MTLDevice> mtlDevice = (id<MTLDevice>)device->platformDevice();
>-    EXPECT_NOT_NULL(mtlDevice);
>+    EXPECT_NOT_NULL(device.metal());
> 
>     auto bufferView = JSC::Uint8Array::create(1024);
> 
>-    uint8_t* data = bufferView->data();
>+    auto data = bufferView->data();
>     memset(data, 1, bufferView->byteLength());
> 
>-    auto buffer = device->createBufferFromData(bufferView.get());
>-    EXPECT_NOT_NULL(buffer);
>-    EXPECT_EQ(buffer->length(), static_cast<unsigned long>(1024));
>+    GPUBuffer buffer { device, *bufferView };
>+    EXPECT_EQ(1024U, buffer.length());
> 
>-    auto contents = buffer->contents();
>+    auto contents = buffer.contents();
>     EXPECT_NOT_NULL(contents);
>-    EXPECT_EQ(contents->byteLength(), static_cast<unsigned long>(1024));
>-
>-    uint8_t* contentsData = static_cast<uint8_t*>(contents->data());
>-    EXPECT_NE(contentsData, data);
>-    EXPECT_EQ(contentsData[0], 1);
>-    EXPECT_EQ(contentsData[512], 1);
>-    EXPECT_EQ(contentsData[1023], 1);
>-
>-    MTLBuffer *mtlBuffer = buffer->platformBuffer();
>-    EXPECT_NOT_NULL(mtlBuffer);
>+    EXPECT_EQ(1024U, contents->byteLength());
> 
>+    auto contentsData = static_cast<uint8_t*>(contents->data());
>+    EXPECT_NE(data, contentsData);
>+    EXPECT_EQ(1U, contentsData[0]);
>+    EXPECT_EQ(1U, contentsData[512]);
>+    EXPECT_EQ(1U, contentsData[1023]);
> 
>+    EXPECT_NOT_NULL(buffer.metal());
> }
> 
> } // namespace TestWebKitAPI
>diff --git a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUCommandQueue.mm b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUCommandQueue.mm
>index 156d8fb7ed3db037d5c4ff06cb34daa40c5d58b8..507b87e5b4e4264c23a90ec65a1064bfe7ac0f5f 100644
>--- a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUCommandQueue.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUCommandQueue.mm
>@@ -39,31 +39,29 @@ namespace TestWebKitAPI {
> 
> TEST_F(GPU, CommandQueueCreate)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>+
>     // Not all hardware supports Metal, so it is possible
>     // that we were unable to create the MTLDevice object.
>     // In that case, the device should be null.
>     if (!device)
>         return;
> 
>-    auto commandQueue = device->createCommandQueue();
>-    EXPECT_NOT_NULL(commandQueue);
>-    EXPECT_WK_STREQ(commandQueue->label(), emptyString());
>+    GPUCommandQueue commandQueue { device };
>+    EXPECT_WK_STREQ("", commandQueue.label());
> 
>-    id<MTLCommandQueue> mtlCommandQueue = (id<MTLCommandQueue>)commandQueue->platformCommandQueue();
>-    EXPECT_NOT_NULL(mtlCommandQueue);
>+    EXPECT_NOT_NULL(commandQueue.metal());
> 
>     // If you haven't set a label, we just use the prefix.
>-    EXPECT_STREQ("com.apple.WebKit", [mtlCommandQueue.label UTF8String]);
>+    EXPECT_STREQ("com.apple.WebKit", commandQueue.metal().label.UTF8String);
> 
>-    String testLabel("this.is.a.test"_s);
>-    commandQueue->setLabel(testLabel);
>+    commandQueue.setLabel("this.is.a.test"_s);
> 
>     // The WebKit API doesn't prefix.
>-    EXPECT_WK_STREQ(commandQueue->label(), testLabel);
>+    EXPECT_WK_STREQ("this.is.a.test", commandQueue.label());
> 
>     // But the underlying Metal object label will have one.
>-    EXPECT_STREQ("com.apple.WebKit.this.is.a.test", [mtlCommandQueue.label UTF8String]);
>+    EXPECT_STREQ("com.apple.WebKit.this.is.a.test", commandQueue.metal().label.UTF8String);
> }
> 
> } // namespace TestWebKitAPI
>diff --git a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUDevice.mm b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUDevice.mm
>index 276a7cbdd2d1200d14275d7f78ac4f6a3875d770..6a61f0d20c2fea580ebf79899b35055a706ac941 100644
>--- a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUDevice.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUDevice.mm
>@@ -37,21 +37,18 @@ namespace TestWebKitAPI {
> 
> TEST_F(GPU, DeviceCreate)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>+
>     // Not all hardware supports Metal, so it is possible
>     // that we were unable to create the MTLDevice object.
>     // In that case, the device should be null.
>     if (!device)
>         return;
> 
>-    EXPECT_NOT_NULL(device->layer());
>-    EXPECT_NOT_NULL(device->platformLayer());
>-
>-    id<MTLDevice> mtlDevice = (id<MTLDevice>)device->platformDevice();
>-    EXPECT_NOT_NULL(mtlDevice);
>-
>-    NSString *deviceName = mtlDevice.name;
>-    EXPECT_GT(deviceName.length, static_cast<unsigned long>(0));
>+    EXPECT_NOT_NULL(device.layer());
>+    EXPECT_NOT_NULL(device.platformLayer());
>+    EXPECT_NOT_NULL(device.metal());
>+    EXPECT_LT(0U, device.metal().name.length);
> }
> 
> } // namespace TestWebKitAPI
>diff --git a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUFunction.mm b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUFunction.mm
>index adef73eacdafdc1f792d63ea0493b30192b31746..3f95af2f6cd9df7d10fd3a6e086d9b08695fff2a 100644
>--- a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUFunction.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPUFunction.mm
>@@ -29,6 +29,7 @@
> #if ENABLE(WEBGPU)
> 
> #import "GPUTest.h"
>+#import "PlatformUtilities.h"
> #import <Metal/Metal.h>
> #import <WebCore/GPUDevice.h>
> #import <WebCore/GPUFunction.h>
>@@ -40,29 +41,28 @@ namespace TestWebKitAPI {
> 
> TEST_F(GPU, FunctionAccessByName)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>+
>     // Not all hardware supports Metal, so it is possible
>     // that we were unable to create the MTLDevice object.
>     // In that case, the device should be null.
>     if (!device)
>         return;
> 
>-    id<MTLDevice> mtlDevice = (id<MTLDevice>)device->platformDevice();
>-    EXPECT_NOT_NULL(mtlDevice);
>+    EXPECT_NOT_NULL(device.metal());
> 
>-    auto library = device->createLibrary(librarySourceCode());
>-    EXPECT_NOT_NULL(library);
>+    GPULibrary library { device, librarySourceCode() };
> 
>-    auto vertexFunction = library->functionWithName("vertex_main");
>-    EXPECT_NOT_NULL(vertexFunction);
>-    EXPECT_EQ("vertex_main", vertexFunction->name());
>+    GPUFunction vertexFunction { library, "vertex_main"_s };
>+    EXPECT_NOT_NULL(vertexFunction.metal());
>+    EXPECT_WK_STREQ("vertex_main", vertexFunction.name());
> 
>-    auto fragmentFunction = library->functionWithName("fragment_main");
>-    EXPECT_NOT_NULL(fragmentFunction);
>-    EXPECT_EQ("fragment_main", fragmentFunction->name());
>+    GPUFunction fragmentFunction { library, "fragment_main"_s };
>+    EXPECT_NOT_NULL(fragmentFunction.metal());
>+    EXPECT_WK_STREQ("fragment_main", fragmentFunction.name());
> 
>-    auto nonExistentFunction = library->functionWithName("name_that_is_not_in_library");
>-    EXPECT_NULL(nonExistentFunction);
>+    GPUFunction nonexistentFunction { library, "name_that_is_not_in_library"_s };
>+    EXPECT_NULL(nonexistentFunction.metal());
> }
> 
> } // namespace TestWebKitAPI
>diff --git a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPULibrary.mm b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPULibrary.mm
>index b5c0271f579bb0a1f1868b309e40b67801773ed1..bd129295f2052d142c5b8d1865d24a682ba51997 100644
>--- a/Tools/TestWebKitAPI/Tests/WebCore/mac/GPULibrary.mm
>+++ b/Tools/TestWebKitAPI/Tests/WebCore/mac/GPULibrary.mm
>@@ -28,6 +28,7 @@
> #if ENABLE(WEBGPU)
> 
> #import "GPUTest.h"
>+#import "PlatformUtilities.h"
> #import <Metal/Metal.h>
> #import <WebCore/GPUDevice.h>
> #import <WebCore/GPULibrary.h>
>@@ -38,46 +39,46 @@ namespace TestWebKitAPI {
> 
> TEST_F(GPU, LibraryCreate)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>+
>     // Not all hardware supports Metal, so it is possible
>     // that we were unable to create the MTLDevice object.
>     // In that case, the device should be null.
>     if (!device)
>         return;
> 
>-    id<MTLDevice> mtlDevice = (id<MTLDevice>)device->platformDevice();
>-    EXPECT_NOT_NULL(mtlDevice);
>+    EXPECT_NOT_NULL(device.metal());
> 
>-    auto library = device->createLibrary(librarySourceCode());
>-    EXPECT_NOT_NULL(library);
>+    GPULibrary library { device, librarySourceCode() };
>+    EXPECT_NOT_NULL(library.metal());
> }
> 
> TEST_F(GPU, LibrarySetLabel)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>     if (!device)
>         return;
> 
>-    auto library = device->createLibrary(librarySourceCode());
>-    EXPECT_NOT_NULL(library);
>+    GPULibrary library { device, librarySourceCode() };
>+    EXPECT_NOT_NULL(library.metal());
> 
>-    library->setLabel("TestLabel");
>-    EXPECT_EQ("TestLabel", library->label());
>+    library.setLabel("TestLabel"_s);
>+    EXPECT_EQ("TestLabel", library.label());
> }
> 
> TEST_F(GPU, LibraryFunctionNames)
> {
>-    auto device = GPUDevice::create();
>+    GPUDevice device;
>     if (!device)
>         return;
> 
>-    auto library = device->createLibrary(librarySourceCode());
>-    EXPECT_NOT_NULL(library);
>+    GPULibrary library { device, librarySourceCode() };
>+    EXPECT_NOT_NULL(library.metal());
> 
>-    auto functionNames = library->functionNames();
>-    EXPECT_EQ(functionNames.size(), static_cast<unsigned long>(2));
>-    EXPECT_EQ("vertex_main", functionNames[0]);
>-    EXPECT_EQ("fragment_main", functionNames[1]);
>+    auto functionNames = library.functionNames();
>+    EXPECT_EQ(2U, functionNames.size());
>+    EXPECT_WK_STREQ("vertex_main", functionNames[0]);
>+    EXPECT_WK_STREQ("fragment_main", functionNames[1]);
> }
> 
> } // namespace TestWebKitAPI

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