Attachment 372129 Details for Bug 197755 – 1. Add preliminary ANGLE backend to WebCore

[patch] 1. Add preliminary ANGLE backend to WebCore

bug-197755-20190614112125.patch (text/plain), 161.13 KB, created by Kenneth Russell on 2019-06-14 11:21:25 PDT

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Filename:

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Creator: Kenneth Russell

Created: 2019-06-14 11:21:25 PDT

Size: 161.13 KB

patch

obsolete

>Subversion Revision: 246438
>diff --git a/Source/ThirdParty/ANGLE/ChangeLog b/Source/ThirdParty/ANGLE/ChangeLog
>index 5b50ceb1e15397f7a3ee38fc4e78aad4b9d60375..8a076b828ff65460376df9db6e7a1e217f98fd6a 100644
>--- a/Source/ThirdParty/ANGLE/ChangeLog
>+++ b/Source/ThirdParty/ANGLE/ChangeLog
>@@ -1,3 +1,18 @@
>+2019-06-14  Kenneth Russell  <kbr@chromium.org>
>+
>+        Support using ANGLE as the backend for the WebGL implementation
>+        https://bugs.webkit.org/show_bug.cgi?id=197755
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Add a build step which processes ANGLE's copied public headers so they
>+        can all be referred to under the <ANGLE/xyz.h> prefix. This avoids
>+        touching ANGLE's headers and allows WebCore to include them with no
>+        additional include path modifications.
>+
>+        * ANGLE.xcodeproj/project.pbxproj:
>+        * adjust-angle-include-paths.sh: Added.
>+
> 2019-06-12  Justin Fan  <justin_fan@apple.com>
> 
>         [WebGL] ANGLE Extension directive location incorrectly enforced for webgl 1.0
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index edf2cefd4c57477779414273caccbe94f929a621..0d5e33bd00b9aa025d98630c60caadebecf9a4d2 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,16 @@
>+2019-06-14  Kenneth Russell  <kbr@chromium.org>
>+
>+        Support using ANGLE as the backend for the WebGL implementation
>+        https://bugs.webkit.org/show_bug.cgi?id=197755
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Add a USE_ANGLE definition to wtf/Platform.h (currently disabled)
>+        which, when enabled, uses ANGLE instead of the OpenGL or OpenGL ES
>+        backend.
>+
>+        * wtf/Platform.h:
>+
> 2019-06-12  Antoine Quint  <graouts@apple.com>
> 
>         Show the web page URL when sharing an AR model
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index d1bf8cb7af3446a1b2341fd9f9e71d2a3945cfc1..86a15118c0441644eb16ba70e4fda1b9cb06bcc4 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,279 @@
>+2019-06-14  Kenneth Russell  <kbr@chromium.org>
>+
>+        Support using ANGLE as the backend for the WebGL implementation
>+        https://bugs.webkit.org/show_bug.cgi?id=197755
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Add new files supplying an ANGLE version of GraphicsContext3D and
>+        Extensions3D, conditionalized under USE_ANGLE. Update Xcode project to
>+        build these files. This option compiles and links successfully.
>+
>+        FIXMEs remain in several common files which will be addressed in
>+        subsequent patches.
>+
>+        This work will be tested with the preexisting WebGL conformance
>+        suite.
>+
>+        * SourcesCocoa.txt:
>+        * WebCore.xcodeproj/project.pbxproj:
>+        * platform/graphics/ANGLEWebKitBridge.h:
>+        * platform/graphics/GraphicsContext3D.h:
>+        * platform/graphics/GraphicsContext3DManager.cpp:
>+        (WebCore::GraphicsContext3DManager::updateAllContexts):
>+        (WebCore::GraphicsContext3DManager::updateHighPerformanceState):
>+        (WebCore::GraphicsContext3DManager::disableHighPerformanceGPUTimerFired):
>+        * platform/graphics/angle/Extensions3DANGLE.cpp: Copied from Source/WebCore/platform/graphics/opengl/Extensions3DOpenGLCommon.cpp.
>+        (WebCore::Extensions3DANGLE::Extensions3DANGLE):
>+        (WebCore::Extensions3DANGLE::supports):
>+        (WebCore::Extensions3DANGLE::ensureEnabled):
>+        (WebCore::Extensions3DANGLE::isEnabled):
>+        (WebCore::Extensions3DANGLE::getGraphicsResetStatusARB):
>+        (WebCore::Extensions3DANGLE::getTranslatedShaderSourceANGLE):
>+        (WebCore::Extensions3DANGLE::initializeAvailableExtensions):
>+        (WebCore::Extensions3DANGLE::readnPixelsEXT):
>+        (WebCore::Extensions3DANGLE::getnUniformfvEXT):
>+        (WebCore::Extensions3DANGLE::getnUniformivEXT):
>+        (WebCore::Extensions3DANGLE::blitFramebuffer):
>+        (WebCore::Extensions3DANGLE::renderbufferStorageMultisample):
>+        (WebCore::Extensions3DANGLE::createVertexArrayOES):
>+        (WebCore::Extensions3DANGLE::deleteVertexArrayOES):
>+        (WebCore::Extensions3DANGLE::isVertexArrayOES):
>+        (WebCore::Extensions3DANGLE::bindVertexArrayOES):
>+        (WebCore::Extensions3DANGLE::insertEventMarkerEXT):
>+        (WebCore::Extensions3DANGLE::pushGroupMarkerEXT):
>+        (WebCore::Extensions3DANGLE::popGroupMarkerEXT):
>+        (WebCore::Extensions3DANGLE::supportsExtension):
>+        (WebCore::Extensions3DANGLE::drawBuffersEXT):
>+        (WebCore::Extensions3DANGLE::drawArraysInstanced):
>+        (WebCore::Extensions3DANGLE::drawElementsInstanced):
>+        (WebCore::Extensions3DANGLE::vertexAttribDivisor):
>+        (WebCore::Extensions3DANGLE::getExtensions):
>+        * platform/graphics/angle/Extensions3DANGLE.h: Added.
>+        * platform/graphics/angle/GraphicsContext3DANGLE.cpp: Copied from Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp.
>+        (WebCore::GraphicsContext3D::releaseShaderCompiler):
>+        (WebCore::wipeAlphaChannelFromPixels):
>+        (WebCore::GraphicsContext3D::readPixelsAndConvertToBGRAIfNecessary):
>+        (WebCore::GraphicsContext3D::validateAttributes):
>+        (WebCore::GraphicsContext3D::reshapeFBOs):
>+        (WebCore::GraphicsContext3D::attachDepthAndStencilBufferIfNeeded):
>+        (WebCore::GraphicsContext3D::resolveMultisamplingIfNecessary):
>+        (WebCore::GraphicsContext3D::renderbufferStorage):
>+        (WebCore::GraphicsContext3D::getIntegerv):
>+        (WebCore::GraphicsContext3D::getShaderPrecisionFormat):
>+        (WebCore::GraphicsContext3D::texImage2D):
>+        (WebCore::GraphicsContext3D::depthRange):
>+        (WebCore::GraphicsContext3D::clearDepth):
>+        (WebCore::GraphicsContext3D::getExtensions):
>+        (WebCore::GraphicsContext3D::readPixels):
>+        (WebCore::setCurrentNameHashMapForShader):
>+        (WebCore::nameHashForShader):
>+        (WebCore::GraphicsContext3D::validateDepthStencil):
>+        (WebCore::GraphicsContext3D::paintRenderingResultsToCanvas):
>+        (WebCore::GraphicsContext3D::paintCompositedResultsToCanvas):
>+        (WebCore::GraphicsContext3D::paintRenderingResultsToImageData):
>+        (WebCore::GraphicsContext3D::prepareTexture):
>+        (WebCore::GraphicsContext3D::readRenderingResults):
>+        (WebCore::GraphicsContext3D::reshape):
>+        (WebCore::GraphicsContext3D::checkVaryingsPacking const):
>+        (WebCore::GraphicsContext3D::precisionsMatch const):
>+        (WebCore::GraphicsContext3D::getInternalFramebufferSize const):
>+        (WebCore::GraphicsContext3D::activeTexture):
>+        (WebCore::GraphicsContext3D::attachShader):
>+        (WebCore::GraphicsContext3D::bindAttribLocation):
>+        (WebCore::GraphicsContext3D::bindBuffer):
>+        (WebCore::GraphicsContext3D::bindFramebuffer):
>+        (WebCore::GraphicsContext3D::bindRenderbuffer):
>+        (WebCore::GraphicsContext3D::bindTexture):
>+        (WebCore::GraphicsContext3D::blendColor):
>+        (WebCore::GraphicsContext3D::blendEquation):
>+        (WebCore::GraphicsContext3D::blendEquationSeparate):
>+        (WebCore::GraphicsContext3D::blendFunc):
>+        (WebCore::GraphicsContext3D::blendFuncSeparate):
>+        (WebCore::GraphicsContext3D::bufferData):
>+        (WebCore::GraphicsContext3D::bufferSubData):
>+        (WebCore::GraphicsContext3D::mapBufferRange):
>+        (WebCore::GraphicsContext3D::unmapBuffer):
>+        (WebCore::GraphicsContext3D::copyBufferSubData):
>+        (WebCore::GraphicsContext3D::getInternalformativ):
>+        (WebCore::GraphicsContext3D::renderbufferStorageMultisample):
>+        (WebCore::GraphicsContext3D::texStorage2D):
>+        (WebCore::GraphicsContext3D::texStorage3D):
>+        (WebCore::GraphicsContext3D::getActiveUniforms):
>+        (WebCore::GraphicsContext3D::checkFramebufferStatus):
>+        (WebCore::GraphicsContext3D::clearColor):
>+        (WebCore::GraphicsContext3D::clear):
>+        (WebCore::GraphicsContext3D::clearStencil):
>+        (WebCore::GraphicsContext3D::colorMask):
>+        (WebCore::GraphicsContext3D::compileShader):
>+        (WebCore::GraphicsContext3D::compileShaderDirect):
>+        (WebCore::GraphicsContext3D::copyTexImage2D):
>+        (WebCore::GraphicsContext3D::copyTexSubImage2D):
>+        (WebCore::GraphicsContext3D::cullFace):
>+        (WebCore::GraphicsContext3D::depthFunc):
>+        (WebCore::GraphicsContext3D::depthMask):
>+        (WebCore::GraphicsContext3D::detachShader):
>+        (WebCore::GraphicsContext3D::disable):
>+        (WebCore::GraphicsContext3D::disableVertexAttribArray):
>+        (WebCore::GraphicsContext3D::drawArrays):
>+        (WebCore::GraphicsContext3D::drawElements):
>+        (WebCore::GraphicsContext3D::enable):
>+        (WebCore::GraphicsContext3D::enableVertexAttribArray):
>+        (WebCore::GraphicsContext3D::finish):
>+        (WebCore::GraphicsContext3D::flush):
>+        (WebCore::GraphicsContext3D::framebufferRenderbuffer):
>+        (WebCore::GraphicsContext3D::framebufferTexture2D):
>+        (WebCore::GraphicsContext3D::frontFace):
>+        (WebCore::GraphicsContext3D::generateMipmap):
>+        (WebCore::GraphicsContext3D::getActiveAttribImpl):
>+        (WebCore::GraphicsContext3D::getActiveAttrib):
>+        (WebCore::GraphicsContext3D::getActiveUniformImpl):
>+        (WebCore::GraphicsContext3D::getActiveUniform):
>+        (WebCore::GraphicsContext3D::getAttachedShaders):
>+        (WebCore::generateHashedName):
>+        (WebCore::GraphicsContext3D::mappedSymbolInShaderSourceMap):
>+        (WebCore::GraphicsContext3D::mappedSymbolName):
>+        (WebCore::GraphicsContext3D::originalSymbolInShaderSourceMap):
>+        (WebCore::GraphicsContext3D::originalSymbolName):
>+        (WebCore::GraphicsContext3D::getAttribLocation):
>+        (WebCore::GraphicsContext3D::getAttribLocationDirect):
>+        (WebCore::GraphicsContext3D::getContextAttributes):
>+        (WebCore::GraphicsContext3D::moveErrorsToSyntheticErrorList):
>+        (WebCore::GraphicsContext3D::getError):
>+        (WebCore::GraphicsContext3D::getString):
>+        (WebCore::GraphicsContext3D::hint):
>+        (WebCore::GraphicsContext3D::isBuffer):
>+        (WebCore::GraphicsContext3D::isEnabled):
>+        (WebCore::GraphicsContext3D::isFramebuffer):
>+        (WebCore::GraphicsContext3D::isProgram):
>+        (WebCore::GraphicsContext3D::isRenderbuffer):
>+        (WebCore::GraphicsContext3D::isShader):
>+        (WebCore::GraphicsContext3D::isTexture):
>+        (WebCore::GraphicsContext3D::lineWidth):
>+        (WebCore::GraphicsContext3D::linkProgram):
>+        (WebCore::GraphicsContext3D::pixelStorei):
>+        (WebCore::GraphicsContext3D::polygonOffset):
>+        (WebCore::GraphicsContext3D::sampleCoverage):
>+        (WebCore::GraphicsContext3D::scissor):
>+        (WebCore::GraphicsContext3D::shaderSource):
>+        (WebCore::GraphicsContext3D::stencilFunc):
>+        (WebCore::GraphicsContext3D::stencilFuncSeparate):
>+        (WebCore::GraphicsContext3D::stencilMask):
>+        (WebCore::GraphicsContext3D::stencilMaskSeparate):
>+        (WebCore::GraphicsContext3D::stencilOp):
>+        (WebCore::GraphicsContext3D::stencilOpSeparate):
>+        (WebCore::GraphicsContext3D::texParameterf):
>+        (WebCore::GraphicsContext3D::texParameteri):
>+        (WebCore::GraphicsContext3D::uniform1f):
>+        (WebCore::GraphicsContext3D::uniform1fv):
>+        (WebCore::GraphicsContext3D::uniform2f):
>+        (WebCore::GraphicsContext3D::uniform2fv):
>+        (WebCore::GraphicsContext3D::uniform3f):
>+        (WebCore::GraphicsContext3D::uniform3fv):
>+        (WebCore::GraphicsContext3D::uniform4f):
>+        (WebCore::GraphicsContext3D::uniform4fv):
>+        (WebCore::GraphicsContext3D::uniform1i):
>+        (WebCore::GraphicsContext3D::uniform1iv):
>+        (WebCore::GraphicsContext3D::uniform2i):
>+        (WebCore::GraphicsContext3D::uniform2iv):
>+        (WebCore::GraphicsContext3D::uniform3i):
>+        (WebCore::GraphicsContext3D::uniform3iv):
>+        (WebCore::GraphicsContext3D::uniform4i):
>+        (WebCore::GraphicsContext3D::uniform4iv):
>+        (WebCore::GraphicsContext3D::uniformMatrix2fv):
>+        (WebCore::GraphicsContext3D::uniformMatrix3fv):
>+        (WebCore::GraphicsContext3D::uniformMatrix4fv):
>+        (WebCore::GraphicsContext3D::useProgram):
>+        (WebCore::GraphicsContext3D::validateProgram):
>+        (WebCore::GraphicsContext3D::vertexAttrib1f):
>+        (WebCore::GraphicsContext3D::vertexAttrib1fv):
>+        (WebCore::GraphicsContext3D::vertexAttrib2f):
>+        (WebCore::GraphicsContext3D::vertexAttrib2fv):
>+        (WebCore::GraphicsContext3D::vertexAttrib3f):
>+        (WebCore::GraphicsContext3D::vertexAttrib3fv):
>+        (WebCore::GraphicsContext3D::vertexAttrib4f):
>+        (WebCore::GraphicsContext3D::vertexAttrib4fv):
>+        (WebCore::GraphicsContext3D::vertexAttribPointer):
>+        (WebCore::GraphicsContext3D::viewport):
>+        (WebCore::GraphicsContext3D::createVertexArray):
>+        (WebCore::GraphicsContext3D::deleteVertexArray):
>+        (WebCore::GraphicsContext3D::isVertexArray):
>+        (WebCore::GraphicsContext3D::bindVertexArray):
>+        (WebCore::GraphicsContext3D::getBooleanv):
>+        (WebCore::GraphicsContext3D::getBufferParameteriv):
>+        (WebCore::GraphicsContext3D::getFloatv):
>+        (WebCore::GraphicsContext3D::getInteger64v):
>+        (WebCore::GraphicsContext3D::getFramebufferAttachmentParameteriv):
>+        (WebCore::GraphicsContext3D::getProgramiv):
>+        (WebCore::GraphicsContext3D::getNonBuiltInActiveSymbolCount):
>+        (WebCore::GraphicsContext3D::getUnmangledInfoLog):
>+        (WebCore::GraphicsContext3D::getProgramInfoLog):
>+        (WebCore::GraphicsContext3D::getRenderbufferParameteriv):
>+        (WebCore::GraphicsContext3D::getShaderiv):
>+        (WebCore::GraphicsContext3D::getShaderInfoLog):
>+        (WebCore::GraphicsContext3D::getShaderSource):
>+        (WebCore::GraphicsContext3D::getTexParameterfv):
>+        (WebCore::GraphicsContext3D::getTexParameteriv):
>+        (WebCore::GraphicsContext3D::getUniformfv):
>+        (WebCore::GraphicsContext3D::getUniformiv):
>+        (WebCore::GraphicsContext3D::getUniformLocation):
>+        (WebCore::GraphicsContext3D::getVertexAttribfv):
>+        (WebCore::GraphicsContext3D::getVertexAttribiv):
>+        (WebCore::GraphicsContext3D::getVertexAttribOffset):
>+        (WebCore::GraphicsContext3D::texSubImage2D):
>+        (WebCore::GraphicsContext3D::compressedTexImage2D):
>+        (WebCore::GraphicsContext3D::compressedTexSubImage2D):
>+        (WebCore::GraphicsContext3D::createBuffer):
>+        (WebCore::GraphicsContext3D::createFramebuffer):
>+        (WebCore::GraphicsContext3D::createProgram):
>+        (WebCore::GraphicsContext3D::createRenderbuffer):
>+        (WebCore::GraphicsContext3D::createShader):
>+        (WebCore::GraphicsContext3D::createTexture):
>+        (WebCore::GraphicsContext3D::deleteBuffer):
>+        (WebCore::GraphicsContext3D::deleteFramebuffer):
>+        (WebCore::GraphicsContext3D::deleteProgram):
>+        (WebCore::GraphicsContext3D::deleteRenderbuffer):
>+        (WebCore::GraphicsContext3D::deleteShader):
>+        (WebCore::GraphicsContext3D::deleteTexture):
>+        (WebCore::GraphicsContext3D::synthesizeGLError):
>+        (WebCore::GraphicsContext3D::markContextChanged):
>+        (WebCore::GraphicsContext3D::markLayerComposited):
>+        (WebCore::GraphicsContext3D::layerComposited const):
>+        (WebCore::GraphicsContext3D::forceContextLost):
>+        (WebCore::GraphicsContext3D::recycleContext):
>+        (WebCore::GraphicsContext3D::dispatchContextChangedNotification):
>+        (WebCore::GraphicsContext3D::texImage2DDirect):
>+        (WebCore::GraphicsContext3D::drawArraysInstanced):
>+        (WebCore::GraphicsContext3D::drawElementsInstanced):
>+        (WebCore::GraphicsContext3D::vertexAttribDivisor):
>+        * platform/graphics/angle/TemporaryANGLESetting.cpp: Added.
>+        (WebCore::TemporaryANGLESetting::TemporaryANGLESetting):
>+        (WebCore::TemporaryANGLESetting::~TemporaryANGLESetting):
>+        * platform/graphics/angle/TemporaryANGLESetting.h: Added.
>+        * platform/graphics/cocoa/GraphicsContext3DCocoa.mm:
>+        (WebCore::GraphicsContext3D::GraphicsContext3D):
>+        (WebCore::GraphicsContext3D::~GraphicsContext3D):
>+        (WebCore::GraphicsContext3D::makeContextCurrent):
>+        (WebCore::GraphicsContext3D::checkGPUStatus):
>+        (WebCore::GraphicsContext3D::screenDidChange):
>+        * platform/graphics/cocoa/WebGLLayer.h:
>+        * platform/graphics/cocoa/WebGLLayer.mm:
>+        (-[WebGLLayer display]):
>+        * platform/graphics/cv/TextureCacheCV.mm:
>+        (WebCore::TextureCacheCV::create):
>+        (WebCore::TextureCacheCV::textureFromImage):
>+        * platform/graphics/cv/VideoTextureCopierCV.cpp:
>+        (WebCore::enumToStringMap):
>+        (WebCore::VideoTextureCopierCV::initializeContextObjects):
>+        (WebCore::VideoTextureCopierCV::initializeUVContextObjects):
>+        (WebCore::VideoTextureCopierCV::copyImageToPlatformTexture):
>+        (WebCore::VideoTextureCopierCV::copyVideoTextureToPlatformTexture):
>+        * platform/graphics/opengl/Extensions3DOpenGL.cpp:
>+        * platform/graphics/opengl/Extensions3DOpenGLCommon.cpp:
>+        * platform/graphics/opengl/GraphicsContext3DOpenGL.cpp:
>+        * platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp:
>+        * platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp:
>+
> 2019-06-14  Saam Barati  <sbarati@apple.com>
> 
>         [WHLSL] Implement out-of-bounds and nullptr behavior
>diff --git a/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj b/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj
>index cf94badec0c60c8d759b5114c6a439b345a29879..7cefc59e5ae9fea60fa337db14dc16d36d73c62a 100644
>--- a/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj
>+++ b/Source/ThirdParty/ANGLE/ANGLE.xcodeproj/project.pbxproj
>@@ -2557,6 +2557,7 @@
> 				FB39D0CF1200F0E300088E69 /* Frameworks */,
> 				312BDB0B15FECAB00097EBC7 /* CopyFiles */,
> 				312BDB0D15FECACE0097EBC7 /* CopyFiles */,
>+				6E28B8742294DD8000717E69 /* ShellScript */,
> 			);
> 			buildRules = (
> 			);
>@@ -2595,6 +2596,26 @@
> 		};
> /* End PBXProject section */
> 
>+/* Begin PBXShellScriptBuildPhase section */
>+		6E28B8742294DD8000717E69 /* ShellScript */ = {
>+			isa = PBXShellScriptBuildPhase;
>+			buildActionMask = 2147483647;
>+			files = (
>+			);
>+			inputFileListPaths = (
>+			);
>+			inputPaths = (
>+			);
>+			outputFileListPaths = (
>+			);
>+			outputPaths = (
>+			);
>+			runOnlyForDeploymentPostprocessing = 0;
>+			shellPath = /bin/sh;
>+			shellScript = "/bin/sh $SRCROOT/adjust-angle-include-paths.sh\n";
>+		};
>+/* End PBXShellScriptBuildPhase section */
>+
> /* Begin PBXSourcesBuildPhase section */
> 		FB39D0CE1200F0E300088E69 /* Sources */ = {
> 			isa = PBXSourcesBuildPhase;
>diff --git a/Source/ThirdParty/ANGLE/adjust-angle-include-paths.sh b/Source/ThirdParty/ANGLE/adjust-angle-include-paths.sh
>new file mode 100755
>index 0000000000000000000000000000000000000000..da38a13e970c3adef5600f7bd5bf2d8667feca38
>--- /dev/null
>+++ b/Source/ThirdParty/ANGLE/adjust-angle-include-paths.sh
>@@ -0,0 +1,38 @@
>+#!/bin/sh
>+
>+# WebKit builds ANGLE as a static library, and exports some of the
>+# internal header files as "public headers" in the Xcode project for
>+# consumption by other build targets - e.g. WebCore.
>+#
>+# The build phase which copies these headers also flattens the
>+# directory structure (so that "ANGLE" is the top-level directory
>+# containing all of them - e.g., "#include <ANGLE/gl2.h>").
>+#
>+# It isn't practical to override the include paths so drastically for
>+# the other build targets (like WebCore) that we could make the
>+# original include paths, like <GLES2/gl2.h> work. Changing them so
>+# their namespace is "ANGLE", which implicitly occurs during the "copy
>+# headers" phase, is a reasonable solution.
>+#
>+# This script processes the header files after they're copied during
>+# the Copy Header Files build phase, and adjusts their #includes so
>+# that they refer to each other. This avoids modifying the ANGLE
>+# sources, and allows WebCore to more easily call ANGLE APIs directly.
>+
>+if [ -z "$BUILT_PRODUCTS_DIR" ] ; then
>+  echo Requires BUILT_PRODUCTS_DIR environment variable to be set
>+  exit 1
>+fi
>+
>+output_dir=$BUILT_PRODUCTS_DIR/usr/local/include/ANGLE
>+
>+for i in $output_dir/*.h ; do
>+  sed -i -e '
>+s/^#include <EGL\/$.*$>/#include <ANGLE\/\1>/
>+s/^#include <GLES2\/$.*$>/#include <ANGLE\/\1>/
>+s/^#include <GLES3\/$.*$>/#include <ANGLE\/\1>/
>+s/^#include <KHR\/$.*$>/#include <ANGLE\/\1>/
>+s/^#include <export.h>/#include <ANGLE\/export.h>/
>+s/^#include "$eglext_angle\|gl2ext_angle\|ShaderVars$.h"/#include <ANGLE\/\1.h>/
>+' $i
>+done
>diff --git a/Source/WTF/wtf/Platform.h b/Source/WTF/wtf/Platform.h
>index d56b0b29cda373526b432e544684e9609e2deee8..2d9fd1d977aa4eeea2eefde3f1f17dfd851b4fb5 100644
>--- a/Source/WTF/wtf/Platform.h
>+++ b/Source/WTF/wtf/Platform.h
>@@ -1101,15 +1101,20 @@
> #endif
> 
> #if ENABLE(WEBGL)
>+/* USE_ANGLE=1 uses ANGLE for the WebGL backend.
>+   It replaces USE_OPENGL, USE_OPENGL_ES and USE_EGL. */
> #if PLATFORM(MAC)
> #define USE_OPENGL 1
> #define USE_OPENGL_ES 0
>+#define USE_ANGLE 0
> #elif PLATFORM(IOSMAC) && __has_include(<OpenGL/OpenGL.h>)
> #define USE_OPENGL 1
> #define USE_OPENGL_ES 0
>+#define USE_ANGLE 0
> #else
> #define USE_OPENGL 0
> #define USE_OPENGL_ES 1
>+#define USE_ANGLE 0
> #endif
> #if PLATFORM(COCOA)
> #ifndef GL_SILENCE_DEPRECATION
>@@ -1132,6 +1137,12 @@
> #define USE_EGL 1
> #endif
> 
>+#if ENABLE(WEBGL)
>+#if (USE_ANGLE && (USE_OPENGL || USE_OPENGL_ES || (defined(USE_EGL) && USE_EGL)))
>+#error USE_ANGLE is incompatible with USE_OPENGL, USE_OPENGL_ES and USE_EGL
>+#endif
>+#endif
>+
> #if USE(TEXTURE_MAPPER) && ENABLE(GRAPHICS_CONTEXT_3D) && !defined(USE_TEXTURE_MAPPER_GL)
> #define USE_TEXTURE_MAPPER_GL 1
> #endif
>diff --git a/Source/WebCore/SourcesCocoa.txt b/Source/WebCore/SourcesCocoa.txt
>index 18bfd301d965632b7b1029e08ba361b11e649368..e80a53da721767b3e0183d6f8e070274499dd6b6 100644
>--- a/Source/WebCore/SourcesCocoa.txt
>+++ b/Source/WebCore/SourcesCocoa.txt
>@@ -220,6 +220,12 @@ platform/gamepad/mac/HIDGamepadProvider.cpp
> 
> platform/graphics/MediaPlaybackTargetPicker.cpp
> 
>+// These sources can't be unified with others in case they are merged
>+// with files that use the system OpenGL.
>+platform/graphics/angle/Extensions3DANGLE.cpp @no-unify
>+platform/graphics/angle/GraphicsContext3DANGLE.cpp @no-unify
>+platform/graphics/angle/TemporaryANGLESetting.cpp @no-unify
>+
> platform/graphics/avfoundation/AVTrackPrivateAVFObjCImpl.mm @no-unify
> platform/graphics/avfoundation/AudioSourceProviderAVFObjC.mm @no-unify
> platform/graphics/avfoundation/CDMPrivateMediaSourceAVFObjC.mm @no-unify
>diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>index aacba4c14b071add6cd196b1ea7925fe76e5fe72..36cf664154b8c9528c6b74166c26814f876ce180 100644
>--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
>@@ -2007,6 +2007,11 @@
> 		6E4E91AF10F7FB3100A2779C /* WebGLContextAttributes.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E4E91AA10F7FB3100A2779C /* WebGLContextAttributes.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		6E67D2A71280E8A4008758F7 /* Extensions3DOpenGL.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E67D2A51280E8A4008758F7 /* Extensions3DOpenGL.h */; };
> 		6E67D2A91280E8BD008758F7 /* Extensions3D.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E67D2A81280E8BD008758F7 /* Extensions3D.h */; };
>+		6E72F54C229DCD0C00B3E151 /* Extensions3DANGLE.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 6E27F243229C9F8400F1F632 /* Extensions3DANGLE.cpp */; };
>+		6E72F54E229DCD1000B3E151 /* GraphicsContext3DANGLE.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 6E27F2422298CE4B00F1F632 /* GraphicsContext3DANGLE.cpp */; };
>+		6E72F54F229DCD1300B3E151 /* TemporaryANGLESetting.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 6E290861229DB950000986E2 /* TemporaryANGLESetting.cpp */; };
>+		6E72F550229DCD1700B3E151 /* Extensions3DANGLE.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E27F244229C9F8D00F1F632 /* Extensions3DANGLE.h */; };
>+		6E72F551229DCD1A00B3E151 /* TemporaryANGLESetting.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E290863229DB970000986E2 /* TemporaryANGLESetting.h */; };
> 		6E84E9E117668BF100815B68 /* RasterShape.h in Headers */ = {isa = PBXBuildFile; fileRef = 6E84E9DF17668BAD00815B68 /* RasterShape.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		6EBF0E4812A8926100DB1709 /* OESTextureFloat.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 6EBF0E4512A8926100DB1709 /* OESTextureFloat.cpp */; };
> 		6EBF0E4912A8926100DB1709 /* OESTextureFloat.h in Headers */ = {isa = PBXBuildFile; fileRef = 6EBF0E4612A8926100DB1709 /* OESTextureFloat.h */; };
>@@ -9100,6 +9105,11 @@
> 		6E0E569A183BFFE600E0E8D5 /* FloatRoundedRect.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = FloatRoundedRect.h; sourceTree = "<group>"; };
> 		6E21C6BF1126338500A7BE02 /* GraphicsContext3D.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = GraphicsContext3D.cpp; sourceTree = "<group>"; };
> 		6E21C6C11126339900A7BE02 /* GraphicsContext3DCG.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = GraphicsContext3DCG.cpp; sourceTree = "<group>"; };
>+		6E27F2422298CE4B00F1F632 /* GraphicsContext3DANGLE.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = GraphicsContext3DANGLE.cpp; sourceTree = "<group>"; };
>+		6E27F243229C9F8400F1F632 /* Extensions3DANGLE.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Extensions3DANGLE.cpp; sourceTree = "<group>"; };
>+		6E27F244229C9F8D00F1F632 /* Extensions3DANGLE.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Extensions3DANGLE.h; sourceTree = "<group>"; };
>+		6E290861229DB950000986E2 /* TemporaryANGLESetting.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = TemporaryANGLESetting.cpp; sourceTree = "<group>"; };
>+		6E290863229DB970000986E2 /* TemporaryANGLESetting.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TemporaryANGLESetting.h; sourceTree = "<group>"; };
> 		6E3FAD3614733F4000E42306 /* JSWebGLCompressedTextureS3TC.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSWebGLCompressedTextureS3TC.cpp; sourceTree = "<group>"; };
> 		6E3FAD3614733F4000E42307 /* JSWebGLDepthTexture.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSWebGLDepthTexture.cpp; sourceTree = "<group>"; };
> 		6E3FAD3614733F4010E42307 /* JSWebGLDebugRendererInfo.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSWebGLDebugRendererInfo.cpp; sourceTree = "<group>"; };
>@@ -20404,6 +20414,18 @@
> 			tabWidth = 4;
> 			usesTabs = 0;
> 		};
>+		6E27F2412298CE2E00F1F632 /* angle */ = {
>+			isa = PBXGroup;
>+			children = (
>+				6E27F243229C9F8400F1F632 /* Extensions3DANGLE.cpp */,
>+				6E27F244229C9F8D00F1F632 /* Extensions3DANGLE.h */,
>+				6E27F2422298CE4B00F1F632 /* GraphicsContext3DANGLE.cpp */,
>+				6E290861229DB950000986E2 /* TemporaryANGLESetting.cpp */,
>+				6E290863229DB970000986E2 /* TemporaryANGLESetting.h */,
>+			);
>+			path = angle;
>+			sourceTree = "<group>";
>+		};
> 		6FCFC055212DACC2007695D2 /* floats */ = {
> 			isa = PBXGroup;
> 			children = (
>@@ -24355,6 +24377,7 @@
> 		B2A015910AF6CD53006BCE0E /* graphics */ = {
> 			isa = PBXGroup;
> 			children = (
>+				6E27F2412298CE2E00F1F632 /* angle */,
> 				076F0D0812B8192700C26AA4 /* avfoundation */,
> 				499B3EC0128CCC1800E726C2 /* ca */,
> 				B27535290B053814002CE64F /* cg */,
>@@ -29038,6 +29061,7 @@
> 				837FB3451F9EA06D00D0FC31 /* ExtendableMessageEvent.h in Headers */,
> 				31DCDF441DA1C45400EA5B93 /* ExtendedColor.h in Headers */,
> 				6E67D2A91280E8BD008758F7 /* Extensions3D.h in Headers */,
>+				6E72F550229DCD1700B3E151 /* Extensions3DANGLE.h in Headers */,
> 				6E67D2A71280E8A4008758F7 /* Extensions3DOpenGL.h in Headers */,
> 				44DAB5B215A623580097C1E4 /* Extensions3DOpenGLCommon.h in Headers */,
> 				E47E276516036ED200EE2AFB /* ExtensionStyleSheets.h in Headers */,
>@@ -31817,6 +31841,7 @@
> 				F55B3DD61251F12D003EF269 /* TelephoneInputType.h in Headers */,
> 				7CC564B818BABEA6001B9652 /* TelephoneNumberDetector.h in Headers */,
> 				C65046A9167BFB5500CC2A4D /* TemplateContentDocumentFragment.h in Headers */,
>+				6E72F551229DCD1A00B3E151 /* TemporaryANGLESetting.h in Headers */,
> 				26E944DD1AC4B4EA007B85B5 /* Term.h in Headers */,
> 				6550B6A6099DF0270090D781 /* Text.h in Headers */,
> 				93309E17099E64920056E581 /* TextAffinity.h in Headers */,
>@@ -32716,6 +32741,7 @@
> 				E58B45BB20AD07DD00991025 /* DataListButtonElement.cpp in Sources */,
> 				515BE18F1D54F5FB00DD7C68 /* EmptyGamepadProvider.cpp in Sources */,
> 				724ED32C1A3A7E5400F5F13C /* EXTBlendMinMax.cpp in Sources */,
>+				6E72F54C229DCD0C00B3E151 /* Extensions3DANGLE.cpp in Sources */,
> 				72F1ADA21A3904DC00014E18 /* EXTFragDepth.cpp in Sources */,
> 				5C4304B0191AC908000E2BC0 /* EXTShaderTextureLOD.cpp in Sources */,
> 				727AFED41A2EA6AE000442E8 /* EXTsRGB.cpp in Sources */,
>@@ -32729,6 +32755,7 @@
> 				837964CF1F8DB69D00218EA0 /* GeolocationPositionIOS.mm in Sources */,
> 				D084033C221CBF6900007205 /* GPUBuffer.cpp in Sources */,
> 				6E21C6C01126338500A7BE02 /* GraphicsContext3D.cpp in Sources */,
>+				6E72F54E229DCD1000B3E151 /* GraphicsContext3DANGLE.cpp in Sources */,
> 				7C3E510B18DF8F3500C112F7 /* HTMLConverter.mm in Sources */,
> 				A8D06B3A0A265DCD005E7203 /* HTMLNames.cpp in Sources */,
> 				1AC900C31943C0FC008625B5 /* HTTPHeaderNames.cpp in Sources */,
>@@ -32813,6 +32840,7 @@
> 				538F10A81F9022A4005102CE /* SoftLinkLibxslt.cpp in Sources */,
> 				CDC8B5AA18047FF10016E685 /* SourceBufferPrivateAVFObjC.mm in Sources */,
> 				A833C7CA0A2CF06B00D57664 /* SVGNames.cpp in Sources */,
>+				6E72F54F229DCD1300B3E151 /* TemporaryANGLESetting.cpp in Sources */,
> 				9759E93F14EF1CF80026A2DD /* TextTrack.cpp in Sources */,
> 				9759E94214EF1CF80026A2DD /* TextTrackCue.cpp in Sources */,
> 				071A9EC2168FBC43002629F9 /* TextTrackCueGeneric.cpp in Sources */,
>diff --git a/Source/WebCore/platform/graphics/ANGLEWebKitBridge.h b/Source/WebCore/platform/graphics/ANGLEWebKitBridge.h
>index 4f38bf3ede351e5ef164ebc28f96b2bec5c0bc33..60af01b87f34e2947a4622384aff64656dec1ff6 100644
>--- a/Source/WebCore/platform/graphics/ANGLEWebKitBridge.h
>+++ b/Source/WebCore/platform/graphics/ANGLEWebKitBridge.h
>@@ -38,8 +38,12 @@
> 
> #if USE(OPENGL_ES)
> #import <OpenGLES/ES2/glext.h>
>-#else
>+#elif USE(OPENGL)
> #include <OpenGL/gl.h>
>+#elif USE(ANGLE)
>+#include <ANGLE/gl2.h>
>+#else
>+#error Unsupported configuration
> #endif
> 
> #elif PLATFORM(WIN)
>diff --git a/Source/WebCore/platform/graphics/GraphicsContext3D.h b/Source/WebCore/platform/graphics/GraphicsContext3D.h
>index 11b0e9936c583e5b956d1bc004da2fe03d5929cc..49eba7a2fd9c429583f73dc7a2a6fd42f88a3848 100644
>--- a/Source/WebCore/platform/graphics/GraphicsContext3D.h
>+++ b/Source/WebCore/platform/graphics/GraphicsContext3D.h
>@@ -64,10 +64,14 @@ typedef void* PlatformGraphicsContext3D;
> #endif // __OBJC__
> #endif // USE(OPENGL_ES)
> 
>-#if !USE(OPENGL_ES)
>+#if USE(OPENGL)
> typedef struct _CGLContextObject *CGLContextObj;
> typedef CGLContextObj PlatformGraphicsContext3D;
>-#endif
>+#endif // USE(OPENGL)
>+
>+#if USE(ANGLE)
>+typedef void* PlatformGraphicsContext3D;
>+#endif // USE(ANGLE)
> 
> OBJC_CLASS CALayer;
> OBJC_CLASS WebGLLayer;
>@@ -94,8 +98,10 @@ namespace WebCore {
> class Extensions3D;
> #if !PLATFORM(COCOA) && USE(OPENGL_ES)
> class Extensions3DOpenGLES;
>-#else
>+#elif USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES))
> class Extensions3DOpenGL;
>+#elif USE(ANGLE)
>+class Extensions3DANGLE;
> #endif
> class HostWindow;
> class Image;
>@@ -1431,12 +1437,16 @@ private:
> 
> #if !PLATFORM(COCOA) && USE(OPENGL_ES)
>     friend class Extensions3DOpenGLES;
>+    friend class Extensions3DOpenGLCommon;
>     std::unique_ptr<Extensions3DOpenGLES> m_extensions;
>-#else
>+#elif USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES))
>     friend class Extensions3DOpenGL;
>+    friend class Extensions3DOpenGLCommon;
>     std::unique_ptr<Extensions3DOpenGL> m_extensions;
>+#elif USE(ANGLE)
>+    friend class Extensions3DANGLE;
>+    std::unique_ptr<Extensions3DANGLE> m_extensions;
> #endif
>-    friend class Extensions3DOpenGLCommon;
> 
>     GraphicsContext3DAttributes m_attrs;
>     GraphicsContext3DPowerPreference m_powerPreferenceUsedForCreation { GraphicsContext3DPowerPreference::Default };
>diff --git a/Source/WebCore/platform/graphics/GraphicsContext3DManager.cpp b/Source/WebCore/platform/graphics/GraphicsContext3DManager.cpp
>index 286b4ed19a2f98a79775bad938c9616bd94e1cca..0880008e4d8b6f258aa1c252b85fb76e9386c9b6 100644
>--- a/Source/WebCore/platform/graphics/GraphicsContext3DManager.cpp
>+++ b/Source/WebCore/platform/graphics/GraphicsContext3DManager.cpp
>@@ -35,7 +35,7 @@
> #include <sys/sysctl.h>
> #endif
> 
>-#if PLATFORM(MAC)
>+#if PLATFORM(MAC) && USE(OPENGL)
> #include "SwitchingGPUClient.h"
> #include <OpenGL/OpenGL.h>
> #endif
>@@ -134,7 +134,8 @@ void GraphicsContext3DManager::displayWasReconfigured(CGDirectDisplayID, CGDispl
> 
> void GraphicsContext3DManager::updateAllContexts()
> {
>-#if PLATFORM(MAC)
>+    // FIXME: determine whether to do anything when using ANGLE.
>+#if PLATFORM(MAC) && USE(OPENGL)
>     for (const auto& context : m_contexts) {
>         context->updateCGLContext();
>         context->dispatchContextChangedNotification();
>@@ -217,7 +218,7 @@ void GraphicsContext3DManager::removeContextRequiringHighPerformance(GraphicsCon
> 
> void GraphicsContext3DManager::updateHighPerformanceState()
> {
>-#if PLATFORM(MAC)
>+#if PLATFORM(MAC) && USE(OPENGL)
>     if (!hasLowAndHighPowerGPUs())
>         return;
>     
>@@ -257,7 +258,7 @@ void GraphicsContext3DManager::disableHighPerformanceGPUTimerFired()
>         return;
> 
>     m_requestingHighPerformance = false;
>-#if PLATFORM(MAC)
>+#if PLATFORM(MAC) && USE(OPENGL)
>     SwitchingGPUClient::singleton().releaseHighPerformanceGPU();
> #endif
> }
>diff --git a/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.cpp b/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..5ef901175c0387742ef9a6ce710001908b4de60c
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.cpp
>@@ -0,0 +1,314 @@
>+/*
>+ * Copyright (C) 2019 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>+#include "Extensions3DANGLE.h"
>+
>+#include "GraphicsContext3D.h"
>+
>+#include <ANGLE/entry_points_gles_2_0_autogen.h>
>+#include <ANGLE/entry_points_gles_3_0_autogen.h>
>+
>+// Note: this file can't be compiled in the same unified source file
>+// as others which include the system's OpenGL headers.
>+
>+namespace WebCore {
>+
>+Extensions3DANGLE::Extensions3DANGLE(GraphicsContext3D* context, bool useIndexedGetString)
>+    : m_initializedAvailableExtensions(false)
>+    , m_context(context)
>+    , m_isNVIDIA(false)
>+    , m_isAMD(false)
>+    , m_isIntel(false)
>+    , m_isImagination(false)
>+    , m_requiresBuiltInFunctionEmulation(false)
>+    , m_requiresRestrictedMaximumTextureSize(false)
>+    , m_useIndexedGetString(useIndexedGetString)
>+{
>+    // FIXME: ideally, remove this initialization altogether. ANGLE
>+    // subsumes the responsibility for graphics driver workarounds.
>+    m_vendor = String(reinterpret_cast<const char*>(::glGetString(GL_VENDOR)));
>+    m_renderer = String(reinterpret_cast<const char*>(::glGetString(GL_RENDERER)));
>+
>+    Vector<String> vendorComponents = m_vendor.convertToASCIILowercase().split(' ');
>+    if (vendorComponents.contains("nvidia"))
>+        m_isNVIDIA = true;
>+    if (vendorComponents.contains("ati") || vendorComponents.contains("amd"))
>+        m_isAMD = true;
>+    if (vendorComponents.contains("intel"))
>+        m_isIntel = true;
>+    if (vendorComponents.contains("imagination"))
>+        m_isImagination = true;
>+}
>+
>+Extensions3DANGLE::~Extensions3DANGLE() = default;
>+
>+bool Extensions3DANGLE::supports(const String& name)
>+{
>+    if (!m_initializedAvailableExtensions)
>+        initializeAvailableExtensions();
>+
>+    // We explicitly do not support this extension until
>+    // we fix the following bug:
>+    // https://bugs.webkit.org/show_bug.cgi?id=149734
>+    // FIXME: given that ANGLE is in use, rewrite this in terms of
>+    // ANGLE queries and enable this extension.
>+    if (name == "GL_ANGLE_translated_shader_source")
>+        return false;
>+
>+    return supportsExtension(name);
>+}
>+
>+void Extensions3DANGLE::ensureEnabled(const String& name)
>+{
>+    if (name == "GL_OES_standard_derivatives") {
>+        // Enable support in ANGLE (if not enabled already).
>+        ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+        ShBuiltInResources ANGLEResources = compiler.getResources();
>+        if (!ANGLEResources.OES_standard_derivatives) {
>+            ANGLEResources.OES_standard_derivatives = 1;
>+            compiler.setResources(ANGLEResources);
>+        }
>+    } else if (name == "GL_EXT_draw_buffers") {
>+        // Enable support in ANGLE (if not enabled already).
>+        ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+        ShBuiltInResources ANGLEResources = compiler.getResources();
>+        if (!ANGLEResources.EXT_draw_buffers) {
>+            ANGLEResources.EXT_draw_buffers = 1;
>+            m_context->getIntegerv(Extensions3D::MAX_DRAW_BUFFERS_EXT, &ANGLEResources.MaxDrawBuffers);
>+            compiler.setResources(ANGLEResources);
>+        }
>+    } else if (name == "GL_EXT_shader_texture_lod") {
>+        // Enable support in ANGLE (if not enabled already).
>+        ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+        ShBuiltInResources ANGLEResources = compiler.getResources();
>+        if (!ANGLEResources.EXT_shader_texture_lod) {
>+            ANGLEResources.EXT_shader_texture_lod = 1;
>+            compiler.setResources(ANGLEResources);
>+        }
>+    } else if (name == "GL_EXT_frag_depth") {
>+        // Enable support in ANGLE (if not enabled already).
>+        ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+        ShBuiltInResources ANGLEResources = compiler.getResources();
>+        if (!ANGLEResources.EXT_frag_depth) {
>+            ANGLEResources.EXT_frag_depth = 1;
>+            compiler.setResources(ANGLEResources);
>+        }
>+    }
>+}
>+
>+bool Extensions3DANGLE::isEnabled(const String& name)
>+{
>+    if (name == "GL_OES_standard_derivatives") {
>+        ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+        return compiler.getResources().OES_standard_derivatives;
>+    }
>+    return supports(name);
>+}
>+
>+int Extensions3DANGLE::getGraphicsResetStatusARB()
>+{
>+    return GraphicsContext3D::NO_ERROR;
>+}
>+
>+String Extensions3DANGLE::getTranslatedShaderSourceANGLE(Platform3DObject shader)
>+{
>+    // FIXME: port to use ANGLE's implementation directly.
>+    ASSERT(shader);
>+    int GLshaderType;
>+    ANGLEShaderType shaderType;
>+
>+    ANGLEWebKitBridge& compiler = m_context->m_compiler;
>+
>+    m_context->getShaderiv(shader, GraphicsContext3D::SHADER_TYPE, &GLshaderType);
>+
>+    if (GLshaderType == GraphicsContext3D::VERTEX_SHADER)
>+        shaderType = SHADER_TYPE_VERTEX;
>+    else if (GLshaderType == GraphicsContext3D::FRAGMENT_SHADER)
>+        shaderType = SHADER_TYPE_FRAGMENT;
>+    else
>+        return emptyString(); // Invalid shader type.
>+
>+    HashMap<Platform3DObject, GraphicsContext3D::ShaderSourceEntry>::iterator result = m_context->m_shaderSourceMap.find(shader);
>+
>+    if (result == m_context->m_shaderSourceMap.end())
>+        return emptyString();
>+
>+    GraphicsContext3D::ShaderSourceEntry& entry = result->value;
>+
>+    String translatedShaderSource;
>+    String shaderInfoLog;
>+    uint64_t extraCompileOptions = SH_CLAMP_INDIRECT_ARRAY_BOUNDS | SH_UNFOLD_SHORT_CIRCUIT | SH_INIT_OUTPUT_VARIABLES | SH_ENFORCE_PACKING_RESTRICTIONS | SH_LIMIT_EXPRESSION_COMPLEXITY | SH_LIMIT_CALL_STACK_DEPTH | SH_INITIALIZE_UNINITIALIZED_LOCALS;
>+
>+    if (m_requiresBuiltInFunctionEmulation)
>+        extraCompileOptions |= SH_EMULATE_ABS_INT_FUNCTION;
>+
>+    Vector<std::pair<ANGLEShaderSymbolType, sh::ShaderVariable>> symbols;
>+    bool isValid = compiler.compileShaderSource(entry.source.utf8().data(), shaderType, translatedShaderSource, shaderInfoLog, symbols, extraCompileOptions);
>+
>+    entry.log = shaderInfoLog;
>+    entry.isValid = isValid;
>+
>+    for (const std::pair<ANGLEShaderSymbolType, sh::ShaderVariable>& pair : symbols) {
>+        const std::string& name = pair.second.name;
>+        entry.symbolMap(pair.first).set(String(name.c_str(), name.length()), pair.second);
>+    }
>+
>+    if (!isValid)
>+        return emptyString();
>+
>+    return translatedShaderSource;
>+}
>+
>+void Extensions3DANGLE::initializeAvailableExtensions()
>+{
>+    if (m_useIndexedGetString) {
>+        GLint numExtensions = 0;
>+        gl::GetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
>+        for (GLint i = 0; i < numExtensions; ++i)
>+            m_availableExtensions.add(glGetStringi(GL_EXTENSIONS, i));
>+    } else {
>+        String extensionsString = getExtensions();
>+        for (auto& extension : extensionsString.split(' '))
>+            m_availableExtensions.add(extension);
>+    }
>+    m_initializedAvailableExtensions = true;
>+}
>+
>+void Extensions3DANGLE::readnPixelsEXT(int, int, GC3Dsizei, GC3Dsizei, GC3Denum, GC3Denum, GC3Dsizei, void *)
>+{
>+    m_context->synthesizeGLError(GL_INVALID_OPERATION);
>+}
>+
>+void Extensions3DANGLE::getnUniformfvEXT(GC3Duint, int, GC3Dsizei, float *)
>+{
>+    m_context->synthesizeGLError(GL_INVALID_OPERATION);
>+}
>+
>+void Extensions3DANGLE::getnUniformivEXT(GC3Duint, int, GC3Dsizei, int *)
>+{
>+    m_context->synthesizeGLError(GL_INVALID_OPERATION);
>+}
>+
>+void Extensions3DANGLE::blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter)
>+{
>+    // FIXME: consider adding support for APPLE_framebuffer_multisample.
>+    gl::BlitFramebuffer(srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter);
>+}
>+
>+void Extensions3DANGLE::renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height)
>+{
>+    gl::RenderbufferStorageMultisample(target, samples, internalformat, width, height);
>+}
>+
>+Platform3DObject Extensions3DANGLE::createVertexArrayOES()
>+{
>+    m_context->makeContextCurrent();
>+    GLuint array = 0;
>+    gl::GenVertexArrays(1, &array);
>+    return array;
>+}
>+
>+void Extensions3DANGLE::deleteVertexArrayOES(Platform3DObject array)
>+{
>+    if (!array)
>+        return;
>+
>+    m_context->makeContextCurrent();
>+    gl::DeleteVertexArrays(1, &array);
>+}
>+
>+GC3Dboolean Extensions3DANGLE::isVertexArrayOES(Platform3DObject array)
>+{
>+    if (!array)
>+        return GL_FALSE;
>+
>+    m_context->makeContextCurrent();
>+    return gl::IsVertexArray(array);
>+}
>+
>+void Extensions3DANGLE::bindVertexArrayOES(Platform3DObject array)
>+{
>+    m_context->makeContextCurrent();
>+    gl::BindVertexArray(array);
>+}
>+
>+void Extensions3DANGLE::insertEventMarkerEXT(const String&)
>+{
>+    // FIXME: implement this function and add GL_EXT_debug_marker in supports().
>+    return;
>+}
>+
>+void Extensions3DANGLE::pushGroupMarkerEXT(const String&)
>+{
>+    // FIXME: implement this function and add GL_EXT_debug_marker in supports().
>+    return;
>+}
>+
>+void Extensions3DANGLE::popGroupMarkerEXT(void)
>+{
>+    // FIXME: implement this function and add GL_EXT_debug_marker in supports().
>+    return;
>+}
>+
>+bool Extensions3DANGLE::supportsExtension(const String& name)
>+{
>+    return m_availableExtensions.contains(name);
>+}
>+
>+void Extensions3DANGLE::drawBuffersEXT(GC3Dsizei n, const GC3Denum* bufs)
>+{
>+    gl::DrawBuffers(n, bufs);
>+}
>+
>+void Extensions3DANGLE::drawArraysInstanced(GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei primcount)
>+{
>+    m_context->makeContextCurrent();
>+    gl::DrawArraysInstanced(mode, first, count, primcount);
>+}
>+
>+void Extensions3DANGLE::drawElementsInstanced(GC3Denum mode, GC3Dsizei count, GC3Denum type, long long offset, GC3Dsizei primcount)
>+{
>+    m_context->makeContextCurrent();
>+    gl::DrawElementsInstanced(mode, count, type, reinterpret_cast<GLvoid*>(static_cast<intptr_t>(offset)), primcount);
>+}
>+
>+void Extensions3DANGLE::vertexAttribDivisor(GC3Duint index, GC3Duint divisor)
>+{
>+    m_context->makeContextCurrent();
>+    gl::VertexAttribDivisor(index, divisor);
>+}
>+
>+String Extensions3DANGLE::getExtensions()
>+{
>+    ASSERT(!m_useIndexedGetString);
>+    return String(reinterpret_cast<const char*>(gl::GetString(GL_EXTENSIONS)));
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>diff --git a/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.h b/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..dc29af6dd8b08dd9e30d1b1115b124928e48b6ae
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/angle/Extensions3DANGLE.h
>@@ -0,0 +1,104 @@
>+/*
>+ * Copyright (C) 2019 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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.
>+ */
>+
>+#pragma once
>+
>+#include "Extensions3D.h"
>+
>+#include "GraphicsContext3D.h"
>+#include <wtf/text/StringHash.h>
>+
>+namespace WebCore {
>+
>+class Extensions3DANGLE : public Extensions3D {
>+    WTF_MAKE_FAST_ALLOCATED;
>+public:
>+    // This class only needs to be instantiated by GraphicsContext3D implementations.
>+    Extensions3DANGLE(GraphicsContext3D*, bool useIndexedGetString);
>+    virtual ~Extensions3DANGLE();
>+
>+    // Extensions3D methods.
>+    bool supports(const String&) override;
>+    void ensureEnabled(const String&) override;
>+    bool isEnabled(const String&) override;
>+    int getGraphicsResetStatusARB() override;
>+
>+    Platform3DObject createVertexArrayOES() override;
>+    void deleteVertexArrayOES(Platform3DObject) override;
>+    GC3Dboolean isVertexArrayOES(Platform3DObject) override;
>+    void bindVertexArrayOES(Platform3DObject) override;
>+    void insertEventMarkerEXT(const String&) override;
>+    void pushGroupMarkerEXT(const String&) override;
>+    void popGroupMarkerEXT(void) override;
>+    void drawBuffersEXT(GC3Dsizei, const GC3Denum*) override;
>+
>+    String getTranslatedShaderSourceANGLE(Platform3DObject) override;
>+
>+    void blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter) override;
>+    void renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height) override;
>+
>+    void drawArraysInstanced(GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei primcount) override;
>+    void drawElementsInstanced(GC3Denum mode, GC3Dsizei count, GC3Denum type, long long offset, GC3Dsizei primcount) override;
>+    void vertexAttribDivisor(GC3Duint index, GC3Duint divisor) override;
>+
>+    // EXT Robustness - uses getGraphicsResetStatusARB()
>+    void readnPixelsEXT(int x, int y, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, GC3Dsizei bufSize, void *data) override;
>+    void getnUniformfvEXT(GC3Duint program, int location, GC3Dsizei bufSize, float *params) override;
>+    void getnUniformivEXT(GC3Duint program, int location, GC3Dsizei bufSize, int *params) override;
>+
>+    bool isNVIDIA() override { return m_isNVIDIA; }
>+    bool isAMD() override { return m_isAMD; }
>+    bool isIntel() override { return m_isIntel; }
>+    bool isImagination() override { return m_isImagination; }
>+    String vendor() override { return m_vendor; }
>+
>+    bool requiresBuiltInFunctionEmulation() override { return m_requiresBuiltInFunctionEmulation; }
>+    bool requiresRestrictedMaximumTextureSize() override { return m_requiresRestrictedMaximumTextureSize; }
>+
>+private:
>+    bool supportsExtension(const WTF::String&);
>+    String getExtensions();
>+
>+    virtual void initializeAvailableExtensions();
>+    bool m_initializedAvailableExtensions;
>+    HashSet<String> m_availableExtensions;
>+
>+    // Weak pointer back to GraphicsContext3D.
>+    GraphicsContext3D* m_context;
>+
>+    bool m_isNVIDIA;
>+    bool m_isAMD;
>+    bool m_isIntel;
>+    bool m_isImagination;
>+    bool m_requiresBuiltInFunctionEmulation;
>+    bool m_requiresRestrictedMaximumTextureSize;
>+
>+    bool m_useIndexedGetString { false };
>+
>+    String m_vendor;
>+    String m_renderer;
>+};
>+
>+} // namespace WebCore
>diff --git a/Source/WebCore/platform/graphics/angle/GraphicsContext3DANGLE.cpp b/Source/WebCore/platform/graphics/angle/GraphicsContext3DANGLE.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..94e5af3a483879d0c01f54f691c917a2e0b24f03
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/angle/GraphicsContext3DANGLE.cpp
>@@ -0,0 +1,2305 @@
>+/*
>+ * Copyright (C) 2010, 2013 Apple Inc. All rights reserved.
>+ * Copyright (C) 2019 Google 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. 
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>+#include "GraphicsContext3D.h"
>+
>+#if PLATFORM(IOS_FAMILY)
>+#include "GraphicsContext3DIOS.h"
>+#endif
>+#include "Extensions3DANGLE.h"
>+#include "ImageBuffer.h"
>+#include "ImageData.h"
>+#include "IntRect.h"
>+#include "IntSize.h"
>+#include "Logging.h"
>+#include "NotImplemented.h"
>+#include "TemporaryANGLESetting.h"
>+#include <JavaScriptCore/RegularExpression.h>
>+#include <algorithm>
>+#include <cstring>
>+#include <wtf/HexNumber.h>
>+#include <wtf/ThreadSpecific.h>
>+#include <wtf/text/CString.h>
>+#include <wtf/text/StringBuilder.h>
>+
>+#if USE(ACCELERATE)
>+#include <Accelerate/Accelerate.h>
>+#endif
>+
>+#include <ANGLE/entry_points_gles_2_0_autogen.h>
>+#include <ANGLE/entry_points_gles_3_0_autogen.h>
>+
>+// Note: this file can't be compiled in the same unified source file
>+// as others which include the system's OpenGL headers.
>+
>+// This one definition short-circuits the need for gl2ext.h, which
>+// would need more work to be included from WebCore.
>+#define GL_MAX_SAMPLES_EXT 0x8D57
>+
>+namespace WebCore {
>+
>+void GraphicsContext3D::releaseShaderCompiler()
>+{
>+    makeContextCurrent();
>+    notImplemented();
>+}
>+
>+#if PLATFORM(MAC)
>+static void wipeAlphaChannelFromPixels(int width, int height, unsigned char* pixels)
>+{
>+    // We can assume this doesn't overflow because the calling functions
>+    // use checked arithmetic.
>+    int totalBytes = width * height * 4;
>+    for (int i = 0; i < totalBytes; i += 4)
>+        pixels[i + 3] = 255;
>+}
>+#endif
>+
>+void GraphicsContext3D::readPixelsAndConvertToBGRAIfNecessary(int x, int y, int width, int height, unsigned char* pixels)
>+{
>+    // NVIDIA drivers have a bug where calling readPixels in BGRA can return the wrong values for the alpha channel when the alpha is off for the context.
>+    gl::ReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
>+#if USE(ACCELERATE)
>+    vImage_Buffer src;
>+    src.height = height;
>+    src.width = width;
>+    src.rowBytes = width * 4;
>+    src.data = pixels;
>+
>+    vImage_Buffer dest;
>+    dest.height = height;
>+    dest.width = width;
>+    dest.rowBytes = width * 4;
>+    dest.data = pixels;
>+
>+    // Swap pixel channels from RGBA to BGRA.
>+    const uint8_t map[4] = { 2, 1, 0, 3 };
>+    vImagePermuteChannels_ARGB8888(&src, &dest, map, kvImageNoFlags);
>+#else
>+    int totalBytes = width * height * 4;
>+    for (int i = 0; i < totalBytes; i += 4)
>+        std::swap(pixels[i], pixels[i + 2]);
>+#endif
>+
>+#if PLATFORM(MAC)
>+    if (!m_attrs.alpha)
>+        wipeAlphaChannelFromPixels(width, height, pixels);
>+#endif
>+}
>+
>+void GraphicsContext3D::validateAttributes()
>+{
>+    validateDepthStencil("GL_EXT_packed_depth_stencil");
>+}
>+
>+bool GraphicsContext3D::reshapeFBOs(const IntSize& size)
>+{
>+    const int width = size.width();
>+    const int height = size.height();
>+    GLuint colorFormat, internalDepthStencilFormat = 0;
>+    if (m_attrs.alpha) {
>+        m_internalColorFormat = GL_RGBA8;
>+        colorFormat = GL_RGBA;
>+    } else {
>+        m_internalColorFormat = GL_RGB8;
>+        colorFormat = GL_RGB;
>+    }
>+    if (m_attrs.stencil || m_attrs.depth) {
>+        // We don't allow the logic where stencil is required and depth is not.
>+        // See GraphicsContext3D::validateAttributes.
>+
>+        Extensions3D& extensions = getExtensions();
>+        // Use a 24 bit depth buffer where we know we have it.
>+        if (extensions.supports("GL_OES_packed_depth_stencil"))
>+            internalDepthStencilFormat = GL_DEPTH24_STENCIL8;
>+        else
>+            internalDepthStencilFormat = GL_DEPTH_COMPONENT16;
>+    }
>+
>+    // Resize multisample FBO.
>+    if (m_attrs.antialias) {
>+        GLint maxSampleCount;
>+        gl::GetIntegerv(GL_MAX_SAMPLES_EXT, &maxSampleCount);
>+        // Using more than 4 samples is slow on some hardware and is unlikely to
>+        // produce a significantly better result.
>+        GLint sampleCount = std::min(4, maxSampleCount);
>+        gl::BindFramebuffer(GL_FRAMEBUFFER, m_multisampleFBO);
>+        gl::BindRenderbuffer(GL_RENDERBUFFER, m_multisampleColorBuffer);
>+        gl::RenderbufferStorageMultisample(GL_RENDERBUFFER, sampleCount, GL_RGBA8, width, height);
>+        gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_multisampleColorBuffer);
>+        if (m_attrs.stencil || m_attrs.depth) {
>+            gl::BindRenderbuffer(GL_RENDERBUFFER, m_multisampleDepthStencilBuffer);
>+            gl::RenderbufferStorageMultisample(GL_RENDERBUFFER, sampleCount, internalDepthStencilFormat, width, height);
>+            if (m_attrs.stencil)
>+                gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, m_multisampleDepthStencilBuffer);
>+            if (m_attrs.depth)
>+                gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_multisampleDepthStencilBuffer);
>+        }
>+        gl::BindRenderbuffer(GL_RENDERBUFFER, 0);
>+        if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
>+            // FIXME: cleanup.
>+            notImplemented();
>+        }
>+    }
>+
>+    // resize regular FBO
>+    gl::BindFramebuffer(GL_FRAMEBUFFER, m_fbo);
>+    ASSERT(m_texture);
>+#if PLATFORM(COCOA)
>+
>+#if PLATFORM(MAC)
>+    // FIXME: implement back buffer path using ANGLE and pbuffers.
>+    // allocateIOSurfaceBackingStore(IntSize(width, height));
>+    // updateFramebufferTextureBackingStoreFromLayer();
>+    // gl::FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ARB, m_texture, 0);
>+#elif PLATFORM(IOS_FAMILY)
>+    // FIXME (kbr): implement iOS path, ideally using glFramebufferTexture2DMultisample.
>+    // gl::BindRenderbuffer(GL_RENDERBUFFER, m_texture);
>+    // gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_texture);
>+    // setRenderbufferStorageFromDrawable(m_currentWidth, m_currentHeight);
>+#else
>+#error Unknown platform
>+#endif
>+#else
>+    gl::BindTexture(GL_TEXTURE_2D, m_texture);
>+    gl::TexImage2D(GL_TEXTURE_2D, 0, m_internalColorFormat, width, height, 0, colorFormat, GL_UNSIGNED_BYTE, 0);
>+    gl::FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture, 0);
>+
>+#if USE(COORDINATED_GRAPHICS)
>+    if (m_compositorTexture) {
>+        gl::BindTexture(GL_TEXTURE_2D, m_compositorTexture);
>+        gl::TexImage2D(GL_TEXTURE_2D, 0, m_internalColorFormat, width, height, 0, colorFormat, GL_UNSIGNED_BYTE, 0);
>+        gl::BindTexture(GL_TEXTURE_2D, 0);
>+        gl::BindTexture(GL_TEXTURE_2D, m_intermediateTexture);
>+        gl::TexImage2D(GL_TEXTURE_2D, 0, m_internalColorFormat, width, height, 0, colorFormat, GL_UNSIGNED_BYTE, 0);
>+        gl::BindTexture(GL_TEXTURE_2D, 0);
>+    }
>+#endif
>+#endif // PLATFORM(COCOA)
>+
>+    attachDepthAndStencilBufferIfNeeded(internalDepthStencilFormat, width, height);
>+
>+    bool mustRestoreFBO = true;
>+    if (m_attrs.antialias) {
>+        gl::BindFramebuffer(GL_FRAMEBUFFER, m_multisampleFBO);
>+        if (m_state.boundFBO == m_multisampleFBO)
>+            mustRestoreFBO = false;
>+    } else {
>+        if (m_state.boundFBO == m_fbo)
>+            mustRestoreFBO = false;
>+    }
>+
>+    return mustRestoreFBO;
>+}
>+
>+void GraphicsContext3D::attachDepthAndStencilBufferIfNeeded(GLuint internalDepthStencilFormat, int width, int height)
>+{
>+    if (!m_attrs.antialias && (m_attrs.stencil || m_attrs.depth)) {
>+        gl::BindRenderbuffer(GL_RENDERBUFFER, m_depthStencilBuffer);
>+        gl::RenderbufferStorage(GL_RENDERBUFFER, internalDepthStencilFormat, width, height);
>+        if (m_attrs.stencil)
>+            gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, m_depthStencilBuffer);
>+        if (m_attrs.depth)
>+            gl::FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_depthStencilBuffer);
>+        gl::BindRenderbuffer(GL_RENDERBUFFER, 0);
>+    }
>+
>+    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
>+        // FIXME: cleanup
>+        notImplemented();
>+    }
>+}
>+
>+void GraphicsContext3D::resolveMultisamplingIfNecessary(const IntRect& rect)
>+{
>+    TemporaryANGLESetting scopedScissor(GL_SCISSOR_TEST, GL_FALSE);
>+    TemporaryANGLESetting scopedDither(GL_DITHER, GL_FALSE);
>+    TemporaryANGLESetting scopedDepth(GL_DEPTH_TEST, GL_FALSE);
>+    TemporaryANGLESetting scopedStencil(GL_STENCIL_TEST, GL_FALSE);
>+
>+    // FIXME: figure out more efficient solution for iOS.
>+    IntRect resolveRect = rect;
>+    if (rect.isEmpty())
>+        resolveRect = IntRect(0, 0, m_currentWidth, m_currentHeight);
>+
>+    gl::BlitFramebuffer(resolveRect.x(), resolveRect.y(), resolveRect.maxX(), resolveRect.maxY(), resolveRect.x(), resolveRect.y(), resolveRect.maxX(), resolveRect.maxY(), GL_COLOR_BUFFER_BIT, GL_LINEAR);
>+}
>+
>+void GraphicsContext3D::renderbufferStorage(GC3Denum target, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    gl::RenderbufferStorage(target, internalformat, width, height);
>+}
>+
>+void GraphicsContext3D::getIntegerv(GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    switch (pname) {
>+    case MAX_TEXTURE_SIZE:
>+        gl::GetIntegerv(MAX_TEXTURE_SIZE, value);
>+        if (getExtensions().requiresRestrictedMaximumTextureSize())
>+            *value = std::min(4096, *value);
>+        break;
>+    case MAX_CUBE_MAP_TEXTURE_SIZE:
>+        gl::GetIntegerv(MAX_CUBE_MAP_TEXTURE_SIZE, value);
>+        if (getExtensions().requiresRestrictedMaximumTextureSize())
>+            *value = std::min(1024, *value);
>+        break;
>+#if PLATFORM(MAC)
>+    // Some older hardware advertises a larger maximum than they
>+    // can actually handle. Rather than detecting such devices, simply
>+    // clamp the maximum to 8192, which is big enough for a 5K display.
>+    case MAX_RENDERBUFFER_SIZE:
>+        gl::GetIntegerv(MAX_RENDERBUFFER_SIZE, value);
>+        *value = std::min(8192, *value);
>+        break;
>+    case MAX_VIEWPORT_DIMS:
>+        gl::GetIntegerv(MAX_VIEWPORT_DIMS, value);
>+        value[0] = std::min(8192, value[0]);
>+        value[1] = std::min(8192, value[1]);
>+        break;
>+#endif
>+    default:
>+        gl::GetIntegerv(pname, value);
>+    }
>+}
>+
>+void GraphicsContext3D::getShaderPrecisionFormat(GC3Denum shaderType, GC3Denum precisionType, GC3Dint* range, GC3Dint* precision)
>+{
>+    UNUSED_PARAM(shaderType);
>+    ASSERT(range);
>+    ASSERT(precision);
>+
>+    makeContextCurrent();
>+
>+    switch (precisionType) {
>+    case GraphicsContext3D::LOW_INT:
>+    case GraphicsContext3D::MEDIUM_INT:
>+    case GraphicsContext3D::HIGH_INT:
>+        // These values are for a 32-bit twos-complement integer format.
>+        range[0] = 31;
>+        range[1] = 30;
>+        precision[0] = 0;
>+        break;
>+    case GraphicsContext3D::LOW_FLOAT:
>+    case GraphicsContext3D::MEDIUM_FLOAT:
>+    case GraphicsContext3D::HIGH_FLOAT:
>+        // These values are for an IEEE single-precision floating-point format.
>+        range[0] = 127;
>+        range[1] = 127;
>+        precision[0] = 23;
>+        break;
>+    default:
>+        ASSERT_NOT_REACHED();
>+        break;
>+    }
>+}
>+
>+bool GraphicsContext3D::texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, const void* pixels)
>+{
>+    if (width && height && !pixels) {
>+        synthesizeGLError(INVALID_VALUE);
>+        return false;
>+    }
>+
>+    texImage2DDirect(target, level, internalformat, width, height, border, format, type, pixels);
>+    return true;
>+}
>+
>+void GraphicsContext3D::depthRange(GC3Dclampf zNear, GC3Dclampf zFar)
>+{
>+    makeContextCurrent();
>+    gl::DepthRangef(static_cast<float>(zNear), static_cast<float>(zFar));
>+}
>+
>+void GraphicsContext3D::clearDepth(GC3Dclampf depth)
>+{
>+    makeContextCurrent();
>+    gl::ClearDepthf(static_cast<float>(depth));
>+}
>+
>+Extensions3D& GraphicsContext3D::getExtensions()
>+{
>+    if (!m_extensions)
>+        m_extensions = std::make_unique<Extensions3DANGLE>(this, isGLES2Compliant());
>+    return *m_extensions;
>+}
>+
>+void GraphicsContext3D::readPixels(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, void* data)
>+{
>+    // FIXME: remove the two glFlush calls when the driver bug is fixed, i.e.,
>+    // all previous rendering calls should be done before reading pixels.
>+    makeContextCurrent();
>+    gl::Flush();
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO) {
>+        resolveMultisamplingIfNecessary(IntRect(x, y, width, height));
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+        gl::Flush();
>+    }
>+    gl::ReadPixels(x, y, width, height, format, type, data);
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
>+
>+#if PLATFORM(MAC)
>+    if (!m_attrs.alpha && (format == GraphicsContext3D::RGBA || format == GraphicsContext3D::BGRA) && (m_state.boundFBO == m_fbo || (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO)))
>+        wipeAlphaChannelFromPixels(width, height, static_cast<unsigned char*>(data));
>+#endif
>+}
>+
>+
>+// The contents of GraphicsContext3DOpenGLCommon follow, ported to use ANGLE.
>+
>+static ThreadSpecific<ShaderNameHash*>& getCurrentNameHashMapForShader()
>+{
>+    static std::once_flag onceFlag;
>+    static ThreadSpecific<ShaderNameHash*>* sharedNameHash;
>+    std::call_once(onceFlag, [] {
>+        sharedNameHash = new ThreadSpecific<ShaderNameHash*>;
>+    });
>+
>+    return *sharedNameHash;
>+}
>+
>+static void setCurrentNameHashMapForShader(ShaderNameHash* shaderNameHash)
>+{
>+    *getCurrentNameHashMapForShader() = shaderNameHash;
>+}
>+
>+// Hash function used by the ANGLE translator/compiler to do
>+// symbol name mangling. Since this is a static method, before
>+// calling compileShader we set currentNameHashMapForShader
>+// to point to the map kept by the current instance of GraphicsContext3D.
>+
>+static uint64_t nameHashForShader(const char* name, size_t length)
>+{
>+    if (!length)
>+        return 0;
>+
>+    CString nameAsCString = CString(name);
>+
>+    // Look up name in our local map.
>+    ShaderNameHash*& currentNameHashMapForShader = *getCurrentNameHashMapForShader();
>+    ShaderNameHash::iterator findResult = currentNameHashMapForShader->find(nameAsCString);
>+    if (findResult != currentNameHashMapForShader->end())
>+        return findResult->value;
>+
>+    unsigned hashValue = nameAsCString.hash();
>+
>+    // Convert the 32-bit hash from CString::hash into a 64-bit result
>+    // by shifting then adding the size of our table. Overflow would
>+    // only be a problem if we're already hashing to the same value (and
>+    // we're hoping that over the lifetime of the context we
>+    // don't have that many symbols).
>+
>+    uint64_t result = hashValue;
>+    result = (result << 32) + (currentNameHashMapForShader->size() + 1);
>+
>+    currentNameHashMapForShader->set(nameAsCString, result);
>+    return result;
>+}
>+
>+void GraphicsContext3D::validateDepthStencil(const char* packedDepthStencilExtension)
>+{
>+    Extensions3D& extensions = getExtensions();
>+    if (m_attrs.stencil) {
>+        if (extensions.supports(packedDepthStencilExtension)) {
>+            extensions.ensureEnabled(packedDepthStencilExtension);
>+            // Force depth if stencil is true.
>+            m_attrs.depth = true;
>+        } else
>+            m_attrs.stencil = false;
>+    }
>+    if (m_attrs.antialias) {
>+        if (!extensions.supports("GL_ANGLE_framebuffer_multisample") || isGLES2Compliant())
>+            m_attrs.antialias = false;
>+        else
>+            extensions.ensureEnabled("GL_ANGLE_framebuffer_multisample");
>+    }
>+}
>+
>+void GraphicsContext3D::paintRenderingResultsToCanvas(ImageBuffer* imageBuffer)
>+{
>+    Checked<int, RecordOverflow> rowBytes = Checked<int, RecordOverflow>(m_currentWidth) * 4;
>+    if (rowBytes.hasOverflowed())
>+        return;
>+
>+    Checked<int, RecordOverflow> totalBytesChecked = rowBytes * m_currentHeight;
>+    if (totalBytesChecked.hasOverflowed())
>+        return;
>+    int totalBytes = totalBytesChecked.unsafeGet();
>+
>+    auto pixels = makeUniqueArray<unsigned char>(totalBytes);
>+    if (!pixels)
>+        return;
>+
>+    readRenderingResults(pixels.get(), totalBytes);
>+
>+    if (!m_attrs.premultipliedAlpha) {
>+        for (int i = 0; i < totalBytes; i += 4) {
>+            // Premultiply alpha.
>+            pixels[i + 0] = std::min(255, pixels[i + 0] * pixels[i + 3] / 255);
>+            pixels[i + 1] = std::min(255, pixels[i + 1] * pixels[i + 3] / 255);
>+            pixels[i + 2] = std::min(255, pixels[i + 2] * pixels[i + 3] / 255);
>+        }
>+    }
>+
>+    paintToCanvas(pixels.get(), IntSize(m_currentWidth, m_currentHeight), imageBuffer->internalSize(), imageBuffer->context());
>+
>+#if PLATFORM(COCOA) && USE(OPENGL_ES)
>+    // FIXME: work on iOS integration.
>+    presentRenderbuffer();
>+#endif
>+}
>+
>+bool GraphicsContext3D::paintCompositedResultsToCanvas(ImageBuffer*)
>+{
>+    // Not needed at the moment, so return that nothing was done.
>+    return false;
>+}
>+
>+RefPtr<ImageData> GraphicsContext3D::paintRenderingResultsToImageData()
>+{
>+    // Reading premultiplied alpha would involve unpremultiplying, which is
>+    // lossy.
>+    if (m_attrs.premultipliedAlpha)
>+        return nullptr;
>+
>+    auto imageData = ImageData::create(IntSize(m_currentWidth, m_currentHeight));
>+    unsigned char* pixels = imageData->data()->data();
>+    Checked<int, RecordOverflow> totalBytesChecked = 4 * Checked<int, RecordOverflow>(m_currentWidth) * Checked<int, RecordOverflow>(m_currentHeight);
>+    if (totalBytesChecked.hasOverflowed())
>+        return imageData;
>+    int totalBytes = totalBytesChecked.unsafeGet();
>+
>+    readRenderingResults(pixels, totalBytes);
>+
>+    // Convert to RGBA.
>+    for (int i = 0; i < totalBytes; i += 4)
>+        std::swap(pixels[i], pixels[i + 2]);
>+
>+    return imageData;
>+}
>+
>+void GraphicsContext3D::prepareTexture()
>+{
>+    if (m_layerComposited)
>+        return;
>+
>+    makeContextCurrent();
>+
>+#if !USE(COORDINATED_GRAPHICS)
>+    TemporaryANGLESetting scopedScissor(GL_SCISSOR_TEST, GL_FALSE);
>+    TemporaryANGLESetting scopedDither(GL_DITHER, GL_FALSE);
>+#endif
>+
>+    if (m_attrs.antialias)
>+        resolveMultisamplingIfNecessary();
>+
>+#if USE(COORDINATED_GRAPHICS)
>+    std::swap(m_texture, m_compositorTexture);
>+    std::swap(m_texture, m_intermediateTexture);
>+    gl::BindFramebuffer(GL_FRAMEBUFFER, m_fbo);
>+    gl::FramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_texture, 0);
>+    glFlush();
>+
>+    if (m_state.boundFBO != m_fbo)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_state.boundFBO);
>+    else
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+    return;
>+#endif
>+
>+    gl::ActiveTexture(GL_TEXTURE0);
>+    gl::BindTexture(GL_TEXTURE_2D, m_state.boundTarget(GL_TEXTURE0) == GL_TEXTURE_2D ? m_state.boundTexture(GL_TEXTURE0) : 0);
>+    gl::ActiveTexture(m_state.activeTextureUnit);
>+    if (m_state.boundFBO != m_fbo)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_state.boundFBO);
>+    gl::Flush();
>+}
>+
>+void GraphicsContext3D::readRenderingResults(unsigned char *pixels, int pixelsSize)
>+{
>+    if (pixelsSize < m_currentWidth * m_currentHeight * 4)
>+        return;
>+
>+    makeContextCurrent();
>+
>+    bool mustRestoreFBO = false;
>+    if (m_attrs.antialias) {
>+        resolveMultisamplingIfNecessary();
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+        mustRestoreFBO = true;
>+    } else {
>+        if (m_state.boundFBO != m_fbo) {
>+            mustRestoreFBO = true;
>+            gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+        }
>+    }
>+
>+    GLint packAlignment = 4;
>+    bool mustRestorePackAlignment = false;
>+    gl::GetIntegerv(GL_PACK_ALIGNMENT, &packAlignment);
>+    if (packAlignment > 4) {
>+        gl::PixelStorei(GL_PACK_ALIGNMENT, 4);
>+        mustRestorePackAlignment = true;
>+    }
>+
>+    readPixelsAndConvertToBGRAIfNecessary(0, 0, m_currentWidth, m_currentHeight, pixels);
>+
>+    if (mustRestorePackAlignment)
>+        gl::PixelStorei(GL_PACK_ALIGNMENT, packAlignment);
>+
>+    if (mustRestoreFBO)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_state.boundFBO);
>+}
>+
>+void GraphicsContext3D::reshape(int width, int height)
>+{
>+    if (!platformGraphicsContext3D())
>+        return;
>+
>+    if (width == m_currentWidth && height == m_currentHeight)
>+        return;
>+
>+    ASSERT(width >= 0 && height >= 0);
>+    if (width < 0 || height < 0)
>+        return;
>+
>+    markContextChanged();
>+
>+    m_currentWidth = width;
>+    m_currentHeight = height;
>+
>+    makeContextCurrent();
>+    validateAttributes();
>+
>+    TemporaryANGLESetting scopedScissor(GL_SCISSOR_TEST, GL_FALSE);
>+    TemporaryANGLESetting scopedDither(GL_DITHER, GL_FALSE);
>+
>+    bool mustRestoreFBO = reshapeFBOs(IntSize(width, height));
>+
>+    // Initialize renderbuffers to 0.
>+    GLfloat clearColor[] = {0, 0, 0, 0}, clearDepth = 0;
>+    GLint clearStencil = 0;
>+    GLboolean colorMask[] = {GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE}, depthMask = GL_TRUE;
>+    GLuint stencilMask = 0xffffffff, stencilMaskBack = 0xffffffff;
>+    GLbitfield clearMask = GL_COLOR_BUFFER_BIT;
>+    gl::GetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
>+    gl::ClearColor(0, 0, 0, 0);
>+    gl::GetBooleanv(GL_COLOR_WRITEMASK, colorMask);
>+    gl::ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
>+    if (m_attrs.depth) {
>+        gl::GetFloatv(GL_DEPTH_CLEAR_VALUE, &clearDepth);
>+        GraphicsContext3D::clearDepth(1);
>+        gl::GetBooleanv(GL_DEPTH_WRITEMASK, &depthMask);
>+        gl::DepthMask(GL_TRUE);
>+        clearMask |= GL_DEPTH_BUFFER_BIT;
>+    }
>+    if (m_attrs.stencil) {
>+        gl::GetIntegerv(GL_STENCIL_CLEAR_VALUE, &clearStencil);
>+        gl::ClearStencil(0);
>+        gl::GetIntegerv(GL_STENCIL_WRITEMASK, reinterpret_cast<GLint*>(&stencilMask));
>+        gl::GetIntegerv(GL_STENCIL_BACK_WRITEMASK, reinterpret_cast<GLint*>(&stencilMaskBack));
>+        gl::StencilMaskSeparate(GL_FRONT, 0xffffffff);
>+        gl::StencilMaskSeparate(GL_BACK, 0xffffffff);
>+        clearMask |= GL_STENCIL_BUFFER_BIT;
>+    }
>+
>+    gl::Clear(clearMask);
>+
>+    gl::ClearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
>+    gl::ColorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
>+    if (m_attrs.depth) {
>+        GraphicsContext3D::clearDepth(clearDepth);
>+        gl::DepthMask(depthMask);
>+    }
>+    if (m_attrs.stencil) {
>+        gl::ClearStencil(clearStencil);
>+        gl::StencilMaskSeparate(GL_FRONT, stencilMask);
>+        gl::StencilMaskSeparate(GL_BACK, stencilMaskBack);
>+    }
>+
>+    if (mustRestoreFBO)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_state.boundFBO);
>+
>+    gl::Flush();
>+}
>+
>+bool GraphicsContext3D::checkVaryingsPacking(Platform3DObject vertexShader, Platform3DObject fragmentShader) const
>+{
>+    ASSERT(m_shaderSourceMap.contains(vertexShader));
>+    ASSERT(m_shaderSourceMap.contains(fragmentShader));
>+    const auto& vertexEntry = m_shaderSourceMap.find(vertexShader)->value;
>+    const auto& fragmentEntry = m_shaderSourceMap.find(fragmentShader)->value;
>+
>+    HashMap<String, sh::ShaderVariable> combinedVaryings;
>+    for (const auto& vertexSymbol : vertexEntry.varyingMap) {
>+        const String& symbolName = vertexSymbol.key;
>+        // The varying map includes variables for each index of an array variable.
>+        // We only want a single variable to represent the array.
>+        if (symbolName.endsWith("]"))
>+            continue;
>+
>+        // Don't count built in varyings.
>+        if (symbolName == "gl_FragCoord" || symbolName == "gl_FrontFacing" || symbolName == "gl_PointCoord")
>+            continue;
>+
>+        const auto& fragmentSymbol = fragmentEntry.varyingMap.find(symbolName);
>+        if (fragmentSymbol != fragmentEntry.varyingMap.end())
>+            combinedVaryings.add(symbolName, fragmentSymbol->value);
>+    }
>+
>+    size_t numVaryings = combinedVaryings.size();
>+    if (!numVaryings)
>+        return true;
>+
>+    std::vector<sh::ShaderVariable> variables;
>+    variables.reserve(combinedVaryings.size());
>+    for (const auto& varyingSymbol : combinedVaryings.values())
>+        variables.push_back(varyingSymbol);
>+
>+    GC3Dint maxVaryingVectors = 0;
>+    gl::GetIntegerv(MAX_VARYING_VECTORS, &maxVaryingVectors);
>+    return sh::CheckVariablesWithinPackingLimits(maxVaryingVectors, variables);
>+}
>+
>+bool GraphicsContext3D::precisionsMatch(Platform3DObject vertexShader, Platform3DObject fragmentShader) const
>+{
>+    ASSERT(m_shaderSourceMap.contains(vertexShader));
>+    ASSERT(m_shaderSourceMap.contains(fragmentShader));
>+    const auto& vertexEntry = m_shaderSourceMap.find(vertexShader)->value;
>+    const auto& fragmentEntry = m_shaderSourceMap.find(fragmentShader)->value;
>+
>+    HashMap<String, sh::GLenum> vertexSymbolPrecisionMap;
>+
>+    for (const auto& entry : vertexEntry.uniformMap) {
>+        const std::string& mappedName = entry.value.mappedName;
>+        vertexSymbolPrecisionMap.add(String(mappedName.c_str(), mappedName.length()), entry.value.precision);
>+    }
>+
>+    for (const auto& entry : fragmentEntry.uniformMap) {
>+        const std::string& mappedName = entry.value.mappedName;
>+        const auto& vertexSymbol = vertexSymbolPrecisionMap.find(String(mappedName.c_str(), mappedName.length()));
>+        if (vertexSymbol != vertexSymbolPrecisionMap.end() && vertexSymbol->value != entry.value.precision)
>+            return false;
>+    }
>+
>+    return true;
>+}
>+
>+IntSize GraphicsContext3D::getInternalFramebufferSize() const
>+{
>+    return IntSize(m_currentWidth, m_currentHeight);
>+}
>+
>+void GraphicsContext3D::activeTexture(GC3Denum texture)
>+{
>+    makeContextCurrent();
>+    m_state.activeTextureUnit = texture;
>+    gl::ActiveTexture(texture);
>+}
>+
>+void GraphicsContext3D::attachShader(Platform3DObject program, Platform3DObject shader)
>+{
>+    ASSERT(program);
>+    ASSERT(shader);
>+    makeContextCurrent();
>+    m_shaderProgramSymbolCountMap.remove(program);
>+    gl::AttachShader(program, shader);
>+}
>+
>+void GraphicsContext3D::bindAttribLocation(Platform3DObject program, GC3Duint index, const String& name)
>+{
>+    ASSERT(program);
>+    makeContextCurrent();
>+
>+    String mappedName = mappedSymbolName(program, SHADER_SYMBOL_TYPE_ATTRIBUTE, name);
>+    LOG(WebGL, "::bindAttribLocation is mapping %s to %s", name.utf8().data(), mappedName.utf8().data());
>+    gl::BindAttribLocation(program, index, mappedName.utf8().data());
>+}
>+
>+void GraphicsContext3D::bindBuffer(GC3Denum target, Platform3DObject buffer)
>+{
>+    makeContextCurrent();
>+    gl::BindBuffer(target, buffer);
>+}
>+
>+void GraphicsContext3D::bindFramebuffer(GC3Denum target, Platform3DObject buffer)
>+{
>+    makeContextCurrent();
>+    GLuint fbo;
>+    if (buffer)
>+        fbo = buffer;
>+    else
>+        fbo = (m_attrs.antialias ? m_multisampleFBO : m_fbo);
>+    if (fbo != m_state.boundFBO) {
>+        gl::BindFramebuffer(target, fbo);
>+        m_state.boundFBO = fbo;
>+    }
>+}
>+
>+void GraphicsContext3D::bindRenderbuffer(GC3Denum target, Platform3DObject renderbuffer)
>+{
>+    makeContextCurrent();
>+    gl::BindRenderbuffer(target, renderbuffer);
>+}
>+
>+
>+void GraphicsContext3D::bindTexture(GC3Denum target, Platform3DObject texture)
>+{
>+    makeContextCurrent();
>+    m_state.setBoundTexture(m_state.activeTextureUnit, texture, target);
>+    gl::BindTexture(target, texture);
>+}
>+
>+void GraphicsContext3D::blendColor(GC3Dclampf red, GC3Dclampf green, GC3Dclampf blue, GC3Dclampf alpha)
>+{
>+    makeContextCurrent();
>+    gl::BlendColor(red, green, blue, alpha);
>+}
>+
>+void GraphicsContext3D::blendEquation(GC3Denum mode)
>+{
>+    makeContextCurrent();
>+    gl::BlendEquation(mode);
>+}
>+
>+void GraphicsContext3D::blendEquationSeparate(GC3Denum modeRGB, GC3Denum modeAlpha)
>+{
>+    makeContextCurrent();
>+    gl::BlendEquationSeparate(modeRGB, modeAlpha);
>+}
>+
>+
>+void GraphicsContext3D::blendFunc(GC3Denum sfactor, GC3Denum dfactor)
>+{
>+    makeContextCurrent();
>+    gl::BlendFunc(sfactor, dfactor);
>+}
>+
>+void GraphicsContext3D::blendFuncSeparate(GC3Denum srcRGB, GC3Denum dstRGB, GC3Denum srcAlpha, GC3Denum dstAlpha)
>+{
>+    makeContextCurrent();
>+    gl::BlendFuncSeparate(srcRGB, dstRGB, srcAlpha, dstAlpha);
>+}
>+
>+void GraphicsContext3D::bufferData(GC3Denum target, GC3Dsizeiptr size, GC3Denum usage)
>+{
>+    makeContextCurrent();
>+    gl::BufferData(target, size, 0, usage);
>+}
>+
>+void GraphicsContext3D::bufferData(GC3Denum target, GC3Dsizeiptr size, const void* data, GC3Denum usage)
>+{
>+    makeContextCurrent();
>+    gl::BufferData(target, size, data, usage);
>+}
>+
>+void GraphicsContext3D::bufferSubData(GC3Denum target, GC3Dintptr offset, GC3Dsizeiptr size, const void* data)
>+{
>+    makeContextCurrent();
>+    gl::BufferSubData(target, offset, size, data);
>+}
>+
>+void* GraphicsContext3D::mapBufferRange(GC3Denum target, GC3Dintptr offset, GC3Dsizeiptr length, GC3Dbitfield access)
>+{
>+    makeContextCurrent();
>+    return gl::MapBufferRange(target, offset, length, access);
>+}
>+
>+GC3Dboolean GraphicsContext3D::unmapBuffer(GC3Denum target)
>+{
>+    makeContextCurrent();
>+    return gl::UnmapBuffer(target);
>+}
>+
>+void GraphicsContext3D::copyBufferSubData(GC3Denum readTarget, GC3Denum writeTarget, GC3Dintptr readOffset, GC3Dintptr writeOffset, GC3Dsizeiptr size)
>+{
>+    makeContextCurrent();
>+    gl::CopyBufferSubData(readTarget, writeTarget, readOffset, writeOffset, size);
>+}
>+
>+void GraphicsContext3D::getInternalformativ(GC3Denum target, GC3Denum internalformat, GC3Denum pname, GC3Dsizei bufSize, GC3Dint* params)
>+{
>+    makeContextCurrent();
>+    gl::GetInternalformativ(target, internalformat, pname, bufSize, params);
>+}
>+
>+void GraphicsContext3D::renderbufferStorageMultisample(GC3Denum target, GC3Dsizei samples, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    gl::RenderbufferStorageMultisample(target, samples, internalformat, width, height);
>+}
>+
>+void GraphicsContext3D::texStorage2D(GC3Denum target, GC3Dsizei levels, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    gl::TexStorage2D(target, levels, internalformat, width, height);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::texStorage3D(GC3Denum target, GC3Dsizei levels, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dsizei depth)
>+{
>+    makeContextCurrent();
>+    gl::TexStorage3D(target, levels, internalformat, width, height, depth);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::getActiveUniforms(Platform3DObject program, const Vector<GC3Duint>& uniformIndices, GC3Denum pname, Vector<GC3Dint>& params)
>+{
>+    ASSERT(program);
>+    makeContextCurrent();
>+
>+    gl::GetActiveUniformsiv(program, uniformIndices.size(), uniformIndices.data(), pname, params.data());
>+}
>+
>+GC3Denum GraphicsContext3D::checkFramebufferStatus(GC3Denum target)
>+{
>+    makeContextCurrent();
>+    return gl::CheckFramebufferStatus(target);
>+}
>+
>+void GraphicsContext3D::clearColor(GC3Dclampf r, GC3Dclampf g, GC3Dclampf b, GC3Dclampf a)
>+{
>+    makeContextCurrent();
>+    gl::ClearColor(r, g, b, a);
>+}
>+
>+void GraphicsContext3D::clear(GC3Dbitfield mask)
>+{
>+    makeContextCurrent();
>+    gl::Clear(mask);
>+    checkGPUStatus();
>+}
>+
>+void GraphicsContext3D::clearStencil(GC3Dint s)
>+{
>+    makeContextCurrent();
>+    gl::ClearStencil(s);
>+}
>+
>+void GraphicsContext3D::colorMask(GC3Dboolean red, GC3Dboolean green, GC3Dboolean blue, GC3Dboolean alpha)
>+{
>+    makeContextCurrent();
>+    gl::ColorMask(red, green, blue, alpha);
>+}
>+
>+void GraphicsContext3D::compileShader(Platform3DObject shader)
>+{
>+    ASSERT(shader);
>+    makeContextCurrent();
>+
>+    // Turn on name mapping. Due to the way ANGLE name hashing works, we
>+    // point a global hashmap to the map owned by this context.
>+    ShBuiltInResources ANGLEResources = m_compiler.getResources();
>+    ShHashFunction64 previousHashFunction = ANGLEResources.HashFunction;
>+    ANGLEResources.HashFunction = nameHashForShader;
>+
>+    if (!nameHashMapForShaders)
>+        nameHashMapForShaders = std::make_unique<ShaderNameHash>();
>+    setCurrentNameHashMapForShader(nameHashMapForShaders.get());
>+    m_compiler.setResources(ANGLEResources);
>+
>+    String translatedShaderSource = m_extensions->getTranslatedShaderSourceANGLE(shader);
>+
>+    ANGLEResources.HashFunction = previousHashFunction;
>+    m_compiler.setResources(ANGLEResources);
>+    setCurrentNameHashMapForShader(nullptr);
>+
>+    if (!translatedShaderSource.length())
>+        return;
>+
>+    const CString& translatedShaderCString = translatedShaderSource.utf8();
>+    const char* translatedShaderPtr = translatedShaderCString.data();
>+    int translatedShaderLength = translatedShaderCString.length();
>+
>+    LOG(WebGL, "--- begin original shader source ---\n%s\n--- end original shader source ---\n", getShaderSource(shader).utf8().data());
>+    LOG(WebGL, "--- begin translated shader source ---\n%s\n--- end translated shader source ---", translatedShaderPtr);
>+
>+    gl::ShaderSource(shader, 1, &translatedShaderPtr, &translatedShaderLength);
>+
>+    ::glCompileShader(shader);
>+
>+    int compileStatus;
>+
>+    gl::GetShaderiv(shader, COMPILE_STATUS, &compileStatus);
>+
>+    ShaderSourceMap::iterator result = m_shaderSourceMap.find(shader);
>+    GraphicsContext3D::ShaderSourceEntry& entry = result->value;
>+
>+    // Populate the shader log
>+    GLint length = 0;
>+    gl::GetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
>+
>+    if (length) {
>+        GLsizei size = 0;
>+        Vector<GLchar> info(length);
>+        gl::GetShaderInfoLog(shader, length, &size, info.data());
>+
>+        Platform3DObject shaders[2] = { shader, 0 };
>+        entry.log = getUnmangledInfoLog(shaders, 1, String(info.data(), size));
>+    }
>+
>+    if (compileStatus != GL_TRUE) {
>+        entry.isValid = false;
>+        LOG(WebGL, "Error: shader translator produced a shader that OpenGL would not compile.");
>+    }
>+}
>+
>+void GraphicsContext3D::compileShaderDirect(Platform3DObject shader)
>+{
>+    ASSERT(shader);
>+    makeContextCurrent();
>+
>+    HashMap<Platform3DObject, ShaderSourceEntry>::iterator result = m_shaderSourceMap.find(shader);
>+
>+    if (result == m_shaderSourceMap.end())
>+        return;
>+
>+    ShaderSourceEntry& entry = result->value;
>+
>+    const CString& shaderSourceCString = entry.source.utf8();
>+    const char* shaderSourcePtr = shaderSourceCString.data();
>+    int shaderSourceLength = shaderSourceCString.length();
>+
>+    LOG(WebGL, "--- begin direct shader source ---\n%s\n--- end direct shader source ---\n", shaderSourcePtr);
>+
>+    gl::ShaderSource(shader, 1, &shaderSourcePtr, &shaderSourceLength);
>+
>+    gl::CompileShader(shader);
>+
>+    int compileStatus;
>+
>+    gl::GetShaderiv(shader, COMPILE_STATUS, &compileStatus);
>+
>+    if (compileStatus == GL_TRUE) {
>+        entry.isValid = true;
>+        LOG(WebGL, "Direct compilation of shader succeeded.");
>+    } else {
>+        entry.isValid = false;
>+        LOG(WebGL, "Error: direct compilation of shader failed.");
>+    }
>+}
>+
>+void GraphicsContext3D::copyTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height, GC3Dint border)
>+{
>+    makeContextCurrent();
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO) {
>+        resolveMultisamplingIfNecessary(IntRect(x, y, width, height));
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+    }
>+    gl::CopyTexImage2D(target, level, internalformat, x, y, width, height, border);
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
>+}
>+
>+void GraphicsContext3D::copyTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO) {
>+        resolveMultisamplingIfNecessary(IntRect(x, y, width, height));
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
>+    }
>+    gl::CopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
>+    if (m_attrs.antialias && m_state.boundFBO == m_multisampleFBO)
>+        gl::BindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
>+}
>+
>+void GraphicsContext3D::cullFace(GC3Denum mode)
>+{
>+    makeContextCurrent();
>+    gl::CullFace(mode);
>+}
>+
>+void GraphicsContext3D::depthFunc(GC3Denum func)
>+{
>+    makeContextCurrent();
>+    gl::DepthFunc(func);
>+}
>+
>+void GraphicsContext3D::depthMask(GC3Dboolean flag)
>+{
>+    makeContextCurrent();
>+    gl::DepthMask(flag);
>+}
>+
>+void GraphicsContext3D::detachShader(Platform3DObject program, Platform3DObject shader)
>+{
>+    ASSERT(program);
>+    ASSERT(shader);
>+    makeContextCurrent();
>+    m_shaderProgramSymbolCountMap.remove(program);
>+    gl::DetachShader(program, shader);
>+}
>+
>+void GraphicsContext3D::disable(GC3Denum cap)
>+{
>+    makeContextCurrent();
>+    gl::Disable(cap);
>+}
>+
>+void GraphicsContext3D::disableVertexAttribArray(GC3Duint index)
>+{
>+    makeContextCurrent();
>+    gl::DisableVertexAttribArray(index);
>+}
>+
>+void GraphicsContext3D::drawArrays(GC3Denum mode, GC3Dint first, GC3Dsizei count)
>+{
>+    makeContextCurrent();
>+    gl::DrawArrays(mode, first, count);
>+    checkGPUStatus();
>+}
>+
>+void GraphicsContext3D::drawElements(GC3Denum mode, GC3Dsizei count, GC3Denum type, GC3Dintptr offset)
>+{
>+    makeContextCurrent();
>+    gl::DrawElements(mode, count, type, reinterpret_cast<GLvoid*>(static_cast<intptr_t>(offset)));
>+    checkGPUStatus();
>+}
>+
>+void GraphicsContext3D::enable(GC3Denum cap)
>+{
>+    makeContextCurrent();
>+    gl::Enable(cap);
>+}
>+
>+void GraphicsContext3D::enableVertexAttribArray(GC3Duint index)
>+{
>+    makeContextCurrent();
>+    gl::EnableVertexAttribArray(index);
>+}
>+
>+void GraphicsContext3D::finish()
>+{
>+    makeContextCurrent();
>+    gl::Finish();
>+}
>+
>+void GraphicsContext3D::flush()
>+{
>+    makeContextCurrent();
>+    gl::Flush();
>+}
>+
>+void GraphicsContext3D::framebufferRenderbuffer(GC3Denum target, GC3Denum attachment, GC3Denum renderbuffertarget, Platform3DObject buffer)
>+{
>+    makeContextCurrent();
>+    gl::FramebufferRenderbuffer(target, attachment, renderbuffertarget, buffer);
>+}
>+
>+void GraphicsContext3D::framebufferTexture2D(GC3Denum target, GC3Denum attachment, GC3Denum textarget, Platform3DObject texture, GC3Dint level)
>+{
>+    makeContextCurrent();
>+    gl::FramebufferTexture2D(target, attachment, textarget, texture, level);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::frontFace(GC3Denum mode)
>+{
>+    makeContextCurrent();
>+    gl::FrontFace(mode);
>+}
>+
>+void GraphicsContext3D::generateMipmap(GC3Denum target)
>+{
>+    makeContextCurrent();
>+    gl::GenerateMipmap(target);
>+}
>+
>+bool GraphicsContext3D::getActiveAttribImpl(Platform3DObject program, GC3Duint index, ActiveInfo& info)
>+{
>+    if (!program) {
>+        synthesizeGLError(INVALID_VALUE);
>+        return false;
>+    }
>+    makeContextCurrent();
>+    GLint maxAttributeSize = 0;
>+    gl::GetProgramiv(program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &maxAttributeSize);
>+    Vector<GLchar> name(maxAttributeSize); // GL_ACTIVE_ATTRIBUTE_MAX_LENGTH includes null termination.
>+    GLsizei nameLength = 0;
>+    GLint size = 0;
>+    GLenum type = 0;
>+    gl::GetActiveAttrib(program, index, maxAttributeSize, &nameLength, &size, &type, name.data());
>+    if (!nameLength)
>+        return false;
>+
>+    String originalName = originalSymbolName(program, SHADER_SYMBOL_TYPE_ATTRIBUTE, String(name.data(), nameLength));
>+
>+#ifndef NDEBUG
>+    String uniformName(name.data(), nameLength);
>+    LOG(WebGL, "Program %d is mapping active attribute %d from '%s' to '%s'", program, index, uniformName.utf8().data(), originalName.utf8().data());
>+#endif
>+
>+    info.name = originalName;
>+    info.type = type;
>+    info.size = size;
>+    return true;
>+}
>+
>+bool GraphicsContext3D::getActiveAttrib(Platform3DObject program, GC3Duint index, ActiveInfo& info)
>+{
>+    GC3Dint symbolCount;
>+    auto result = m_shaderProgramSymbolCountMap.find(program);
>+    if (result == m_shaderProgramSymbolCountMap.end()) {
>+        getNonBuiltInActiveSymbolCount(program, GraphicsContext3D::ACTIVE_ATTRIBUTES, &symbolCount);
>+        result = m_shaderProgramSymbolCountMap.find(program);
>+    }
>+
>+    ActiveShaderSymbolCounts& symbolCounts = result->value;
>+    GC3Duint rawIndex = (index < symbolCounts.filteredToActualAttributeIndexMap.size()) ? symbolCounts.filteredToActualAttributeIndexMap[index] : -1;
>+
>+    return getActiveAttribImpl(program, rawIndex, info);
>+}
>+
>+bool GraphicsContext3D::getActiveUniformImpl(Platform3DObject program, GC3Duint index, ActiveInfo& info)
>+{
>+    if (!program) {
>+        synthesizeGLError(INVALID_VALUE);
>+        return false;
>+    }
>+
>+    makeContextCurrent();
>+    GLint maxUniformSize = 0;
>+    gl::GetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &maxUniformSize);
>+
>+    Vector<GLchar> name(maxUniformSize); // GL_ACTIVE_UNIFORM_MAX_LENGTH includes null termination.
>+    GLsizei nameLength = 0;
>+    GLint size = 0;
>+    GLenum type = 0;
>+    gl::GetActiveUniform(program, index, maxUniformSize, &nameLength, &size, &type, name.data());
>+    if (!nameLength)
>+        return false;
>+
>+    String originalName = originalSymbolName(program, SHADER_SYMBOL_TYPE_UNIFORM, String(name.data(), nameLength));
>+
>+#ifndef NDEBUG
>+    String uniformName(name.data(), nameLength);
>+    LOG(WebGL, "Program %d is mapping active uniform %d from '%s' to '%s'", program, index, uniformName.utf8().data(), originalName.utf8().data());
>+#endif
>+
>+    info.name = originalName;
>+    info.type = type;
>+    info.size = size;
>+    return true;
>+}
>+
>+bool GraphicsContext3D::getActiveUniform(Platform3DObject program, GC3Duint index, ActiveInfo& info)
>+{
>+    GC3Dint symbolCount;
>+    auto result = m_shaderProgramSymbolCountMap.find(program);
>+    if (result == m_shaderProgramSymbolCountMap.end()) {
>+        getNonBuiltInActiveSymbolCount(program, GraphicsContext3D::ACTIVE_UNIFORMS, &symbolCount);
>+        result = m_shaderProgramSymbolCountMap.find(program);
>+    }
>+    
>+    ActiveShaderSymbolCounts& symbolCounts = result->value;
>+    GC3Duint rawIndex = (index < symbolCounts.filteredToActualUniformIndexMap.size()) ? symbolCounts.filteredToActualUniformIndexMap[index] : -1;
>+    
>+    return getActiveUniformImpl(program, rawIndex, info);
>+}
>+
>+void GraphicsContext3D::getAttachedShaders(Platform3DObject program, GC3Dsizei maxCount, GC3Dsizei* count, Platform3DObject* shaders)
>+{
>+    if (!program) {
>+        synthesizeGLError(INVALID_VALUE);
>+        return;
>+    }
>+    makeContextCurrent();
>+    gl::GetAttachedShaders(program, maxCount, count, shaders);
>+}
>+
>+static String generateHashedName(const String& name)
>+{
>+    if (name.isEmpty())
>+        return name;
>+    uint64_t number = nameHashForShader(name.utf8().data(), name.length());
>+    StringBuilder builder;
>+    builder.appendLiteral("webgl_");
>+    appendUnsignedAsHex(number, builder, Lowercase);
>+    return builder.toString();
>+}
>+
>+Optional<String> GraphicsContext3D::mappedSymbolInShaderSourceMap(Platform3DObject shader, ANGLEShaderSymbolType symbolType, const String& name)
>+{
>+    auto result = m_shaderSourceMap.find(shader);
>+    if (result == m_shaderSourceMap.end())
>+        return WTF::nullopt;
>+
>+    const auto& symbolMap = result->value.symbolMap(symbolType);
>+    auto symbolEntry = symbolMap.find(name);
>+    if (symbolEntry == symbolMap.end())
>+        return WTF::nullopt;
>+
>+    auto& mappedName = symbolEntry->value.mappedName;
>+    return String(mappedName.c_str(), mappedName.length());
>+}
>+
>+String GraphicsContext3D::mappedSymbolName(Platform3DObject program, ANGLEShaderSymbolType symbolType, const String& name)
>+{
>+    GC3Dsizei count = 0;
>+    Platform3DObject shaders[2] = { };
>+    getAttachedShaders(program, 2, &count, shaders);
>+
>+    for (GC3Dsizei i = 0; i < count; ++i) {
>+        auto mappedName = mappedSymbolInShaderSourceMap(shaders[i], symbolType, name);
>+        if (mappedName)
>+            return mappedName.value();
>+    }
>+
>+    // We might have detached or deleted the shaders after linking.
>+    auto result = m_linkedShaderMap.find(program);
>+    if (result != m_linkedShaderMap.end()) {
>+        auto linkedShaders = result->value;
>+        auto mappedName = mappedSymbolInShaderSourceMap(linkedShaders.first, symbolType, name);
>+        if (mappedName)
>+            return mappedName.value();
>+        mappedName = mappedSymbolInShaderSourceMap(linkedShaders.second, symbolType, name);
>+        if (mappedName)
>+            return mappedName.value();
>+    }
>+
>+    if (symbolType == SHADER_SYMBOL_TYPE_ATTRIBUTE && !name.isEmpty()) {
>+        // Attributes are a special case: they may be requested before any shaders have been compiled,
>+        // and aren't even required to be used in any shader program.
>+        if (!nameHashMapForShaders)
>+            nameHashMapForShaders = std::make_unique<ShaderNameHash>();
>+        setCurrentNameHashMapForShader(nameHashMapForShaders.get());
>+
>+        auto generatedName = generateHashedName(name);
>+
>+        setCurrentNameHashMapForShader(nullptr);
>+
>+        m_possiblyUnusedAttributeMap.set(generatedName, name);
>+
>+        return generatedName;
>+    }
>+
>+    return name;
>+}
>+
>+Optional<String> GraphicsContext3D::originalSymbolInShaderSourceMap(Platform3DObject shader, ANGLEShaderSymbolType symbolType, const String& name)
>+{
>+    auto result = m_shaderSourceMap.find(shader);
>+    if (result == m_shaderSourceMap.end())
>+        return WTF::nullopt;
>+
>+    const auto& symbolMap = result->value.symbolMap(symbolType);
>+    for (const auto& symbolEntry : symbolMap) {
>+        if (name == symbolEntry.value.mappedName.c_str())
>+            return symbolEntry.key;
>+    }
>+    return WTF::nullopt;
>+}
>+
>+String GraphicsContext3D::originalSymbolName(Platform3DObject program, ANGLEShaderSymbolType symbolType, const String& name)
>+{
>+    GC3Dsizei count;
>+    Platform3DObject shaders[2];
>+    getAttachedShaders(program, 2, &count, shaders);
>+    
>+    for (GC3Dsizei i = 0; i < count; ++i) {
>+        auto originalName = originalSymbolInShaderSourceMap(shaders[i], symbolType, name);
>+        if (originalName)
>+            return originalName.value();
>+    }
>+
>+    // We might have detached or deleted the shaders after linking.
>+    auto result = m_linkedShaderMap.find(program);
>+    if (result != m_linkedShaderMap.end()) {
>+        auto linkedShaders = result->value;
>+        auto originalName = originalSymbolInShaderSourceMap(linkedShaders.first, symbolType, name);
>+        if (originalName)
>+            return originalName.value();
>+        originalName = originalSymbolInShaderSourceMap(linkedShaders.second, symbolType, name);
>+        if (originalName)
>+            return originalName.value();
>+    }
>+
>+    if (symbolType == SHADER_SYMBOL_TYPE_ATTRIBUTE && !name.isEmpty()) {
>+        // Attributes are a special case: they may be requested before any shaders have been compiled,
>+        // and aren't even required to be used in any shader program.
>+
>+        const auto& cached = m_possiblyUnusedAttributeMap.find(name);
>+        if (cached != m_possiblyUnusedAttributeMap.end())
>+            return cached->value;
>+    }
>+
>+    return name;
>+}
>+
>+String GraphicsContext3D::mappedSymbolName(Platform3DObject shaders[2], size_t count, const String& name)
>+{
>+    for (size_t symbolType = 0; symbolType <= static_cast<size_t>(SHADER_SYMBOL_TYPE_VARYING); ++symbolType) {
>+        for (size_t i = 0; i < count; ++i) {
>+            ShaderSourceMap::iterator result = m_shaderSourceMap.find(shaders[i]);
>+            if (result == m_shaderSourceMap.end())
>+                continue;
>+            
>+            const ShaderSymbolMap& symbolMap = result->value.symbolMap(static_cast<enum ANGLEShaderSymbolType>(symbolType));
>+            for (const auto& symbolEntry : symbolMap) {
>+                if (name == symbolEntry.value.mappedName.c_str())
>+                    return symbolEntry.key;
>+            }
>+        }
>+    }
>+    return name;
>+}
>+
>+int GraphicsContext3D::getAttribLocation(Platform3DObject program, const String& name)
>+{
>+    if (!program)
>+        return -1;
>+
>+    makeContextCurrent();
>+
>+    String mappedName = mappedSymbolName(program, SHADER_SYMBOL_TYPE_ATTRIBUTE, name);
>+    LOG(WebGL, "gl::GetAttribLocation is mapping %s to %s", name.utf8().data(), mappedName.utf8().data());
>+    return gl::GetAttribLocation(program, mappedName.utf8().data());
>+}
>+
>+int GraphicsContext3D::getAttribLocationDirect(Platform3DObject program, const String& name)
>+{
>+    if (!program)
>+        return -1;
>+
>+    makeContextCurrent();
>+
>+    return gl::GetAttribLocation(program, name.utf8().data());
>+}
>+
>+GraphicsContext3DAttributes GraphicsContext3D::getContextAttributes()
>+{
>+    return m_attrs;
>+}
>+
>+bool GraphicsContext3D::moveErrorsToSyntheticErrorList()
>+{
>+    makeContextCurrent();
>+    bool movedAnError = false;
>+
>+    // Set an arbitrary limit of 100 here to avoid creating a hang if
>+    // a problem driver has a bug that causes it to never clear the error.
>+    // Otherwise, we would just loop until we got NO_ERROR.
>+    for (unsigned i = 0; i < 100; ++i) {
>+        GC3Denum error = glGetError();
>+        if (error == NO_ERROR)
>+            break;
>+        m_syntheticErrors.add(error);
>+        movedAnError = true;
>+    }
>+
>+    return movedAnError;
>+}
>+
>+GC3Denum GraphicsContext3D::getError()
>+{
>+    if (!m_syntheticErrors.isEmpty()) {
>+        // Need to move the current errors to the synthetic error list in case
>+        // that error is already there, since the expected behavior of both
>+        // glGetError and getError is to only report each error code once.
>+        moveErrorsToSyntheticErrorList();
>+        return m_syntheticErrors.takeFirst();
>+    }
>+
>+    makeContextCurrent();
>+    return gl::GetError();
>+}
>+
>+String GraphicsContext3D::getString(GC3Denum name)
>+{
>+    makeContextCurrent();
>+    return String(reinterpret_cast<const char*>(gl::GetString(name)));
>+}
>+
>+void GraphicsContext3D::hint(GC3Denum target, GC3Denum mode)
>+{
>+    makeContextCurrent();
>+    gl::Hint(target, mode);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isBuffer(Platform3DObject buffer)
>+{
>+    if (!buffer)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsBuffer(buffer);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isEnabled(GC3Denum cap)
>+{
>+    makeContextCurrent();
>+    return gl::IsEnabled(cap);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isFramebuffer(Platform3DObject framebuffer)
>+{
>+    if (!framebuffer)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsFramebuffer(framebuffer);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isProgram(Platform3DObject program)
>+{
>+    if (!program)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsProgram(program);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isRenderbuffer(Platform3DObject renderbuffer)
>+{
>+    if (!renderbuffer)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsRenderbuffer(renderbuffer);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isShader(Platform3DObject shader)
>+{
>+    if (!shader)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsShader(shader);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isTexture(Platform3DObject texture)
>+{
>+    if (!texture)
>+        return GL_FALSE;
>+
>+    makeContextCurrent();
>+    return gl::IsTexture(texture);
>+}
>+
>+void GraphicsContext3D::lineWidth(GC3Dfloat width)
>+{
>+    makeContextCurrent();
>+    gl::LineWidth(width);
>+}
>+
>+void GraphicsContext3D::linkProgram(Platform3DObject program)
>+{
>+    ASSERT(program);
>+    makeContextCurrent();
>+
>+    GC3Dsizei count = 0;
>+    Platform3DObject shaders[2] = { };
>+    getAttachedShaders(program, 2, &count, shaders);
>+
>+    if (count == 2)
>+        m_linkedShaderMap.set(program, std::make_pair(shaders[0], shaders[1]));
>+
>+    gl::LinkProgram(program);
>+}
>+
>+void GraphicsContext3D::pixelStorei(GC3Denum pname, GC3Dint param)
>+{
>+    makeContextCurrent();
>+    gl::PixelStorei(pname, param);
>+}
>+
>+void GraphicsContext3D::polygonOffset(GC3Dfloat factor, GC3Dfloat units)
>+{
>+    makeContextCurrent();
>+    gl::PolygonOffset(factor, units);
>+}
>+
>+void GraphicsContext3D::sampleCoverage(GC3Dclampf value, GC3Dboolean invert)
>+{
>+    makeContextCurrent();
>+    gl::SampleCoverage(value, invert);
>+}
>+
>+void GraphicsContext3D::scissor(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    gl::Scissor(x, y, width, height);
>+}
>+
>+void GraphicsContext3D::shaderSource(Platform3DObject shader, const String& string)
>+{
>+    ASSERT(shader);
>+
>+    makeContextCurrent();
>+
>+    ShaderSourceEntry entry;
>+
>+    entry.source = string;
>+
>+    m_shaderSourceMap.set(shader, entry);
>+}
>+
>+void GraphicsContext3D::stencilFunc(GC3Denum func, GC3Dint ref, GC3Duint mask)
>+{
>+    makeContextCurrent();
>+    gl::StencilFunc(func, ref, mask);
>+}
>+
>+void GraphicsContext3D::stencilFuncSeparate(GC3Denum face, GC3Denum func, GC3Dint ref, GC3Duint mask)
>+{
>+    makeContextCurrent();
>+    gl::StencilFuncSeparate(face, func, ref, mask);
>+}
>+
>+void GraphicsContext3D::stencilMask(GC3Duint mask)
>+{
>+    makeContextCurrent();
>+    gl::StencilMask(mask);
>+}
>+
>+void GraphicsContext3D::stencilMaskSeparate(GC3Denum face, GC3Duint mask)
>+{
>+    makeContextCurrent();
>+    gl::StencilMaskSeparate(face, mask);
>+}
>+
>+void GraphicsContext3D::stencilOp(GC3Denum fail, GC3Denum zfail, GC3Denum zpass)
>+{
>+    makeContextCurrent();
>+    gl::StencilOp(fail, zfail, zpass);
>+}
>+
>+void GraphicsContext3D::stencilOpSeparate(GC3Denum face, GC3Denum fail, GC3Denum zfail, GC3Denum zpass)
>+{
>+    makeContextCurrent();
>+    gl::StencilOpSeparate(face, fail, zfail, zpass);
>+}
>+
>+void GraphicsContext3D::texParameterf(GC3Denum target, GC3Denum pname, GC3Dfloat value)
>+{
>+    makeContextCurrent();
>+    gl::TexParameterf(target, pname, value);
>+}
>+
>+void GraphicsContext3D::texParameteri(GC3Denum target, GC3Denum pname, GC3Dint value)
>+{
>+    makeContextCurrent();
>+    gl::TexParameteri(target, pname, value);
>+}
>+
>+void GraphicsContext3D::uniform1f(GC3Dint location, GC3Dfloat v0)
>+{
>+    makeContextCurrent();
>+    gl::Uniform1f(location, v0);
>+}
>+
>+void GraphicsContext3D::uniform1fv(GC3Dint location, GC3Dsizei size, const GC3Dfloat* array)
>+{
>+    makeContextCurrent();
>+    gl::Uniform1fv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform2f(GC3Dint location, GC3Dfloat v0, GC3Dfloat v1)
>+{
>+    makeContextCurrent();
>+    gl::Uniform2f(location, v0, v1);
>+}
>+
>+void GraphicsContext3D::uniform2fv(GC3Dint location, GC3Dsizei size, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 2.
>+    makeContextCurrent();
>+    gl::Uniform2fv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform3f(GC3Dint location, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2)
>+{
>+    makeContextCurrent();
>+    gl::Uniform3f(location, v0, v1, v2);
>+}
>+
>+void GraphicsContext3D::uniform3fv(GC3Dint location, GC3Dsizei size, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 3.
>+    makeContextCurrent();
>+    gl::Uniform3fv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform4f(GC3Dint location, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2, GC3Dfloat v3)
>+{
>+    makeContextCurrent();
>+    gl::Uniform4f(location, v0, v1, v2, v3);
>+}
>+
>+void GraphicsContext3D::uniform4fv(GC3Dint location, GC3Dsizei size, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 4.
>+    makeContextCurrent();
>+    gl::Uniform4fv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform1i(GC3Dint location, GC3Dint v0)
>+{
>+    makeContextCurrent();
>+    gl::Uniform1i(location, v0);
>+}
>+
>+void GraphicsContext3D::uniform1iv(GC3Dint location, GC3Dsizei size, const GC3Dint* array)
>+{
>+    makeContextCurrent();
>+    gl::Uniform1iv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform2i(GC3Dint location, GC3Dint v0, GC3Dint v1)
>+{
>+    makeContextCurrent();
>+    gl::Uniform2i(location, v0, v1);
>+}
>+
>+void GraphicsContext3D::uniform2iv(GC3Dint location, GC3Dsizei size, const GC3Dint* array)
>+{
>+    // FIXME: length needs to be a multiple of 2.
>+    makeContextCurrent();
>+    gl::Uniform2iv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform3i(GC3Dint location, GC3Dint v0, GC3Dint v1, GC3Dint v2)
>+{
>+    makeContextCurrent();
>+    gl::Uniform3i(location, v0, v1, v2);
>+}
>+
>+void GraphicsContext3D::uniform3iv(GC3Dint location, GC3Dsizei size, const GC3Dint* array)
>+{
>+    // FIXME: length needs to be a multiple of 3.
>+    makeContextCurrent();
>+    gl::Uniform3iv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniform4i(GC3Dint location, GC3Dint v0, GC3Dint v1, GC3Dint v2, GC3Dint v3)
>+{
>+    makeContextCurrent();
>+    gl::Uniform4i(location, v0, v1, v2, v3);
>+}
>+
>+void GraphicsContext3D::uniform4iv(GC3Dint location, GC3Dsizei size, const GC3Dint* array)
>+{
>+    // FIXME: length needs to be a multiple of 4.
>+    makeContextCurrent();
>+    gl::Uniform4iv(location, size, array);
>+}
>+
>+void GraphicsContext3D::uniformMatrix2fv(GC3Dint location, GC3Dsizei size, GC3Dboolean transpose, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 4.
>+    makeContextCurrent();
>+    gl::UniformMatrix2fv(location, size, transpose, array);
>+}
>+
>+void GraphicsContext3D::uniformMatrix3fv(GC3Dint location, GC3Dsizei size, GC3Dboolean transpose, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 9.
>+    makeContextCurrent();
>+    gl::UniformMatrix3fv(location, size, transpose, array);
>+}
>+
>+void GraphicsContext3D::uniformMatrix4fv(GC3Dint location, GC3Dsizei size, GC3Dboolean transpose, const GC3Dfloat* array)
>+{
>+    // FIXME: length needs to be a multiple of 16.
>+    makeContextCurrent();
>+    gl::UniformMatrix4fv(location, size, transpose, array);
>+}
>+
>+void GraphicsContext3D::useProgram(Platform3DObject program)
>+{
>+    makeContextCurrent();
>+    gl::UseProgram(program);
>+}
>+
>+void GraphicsContext3D::validateProgram(Platform3DObject program)
>+{
>+    ASSERT(program);
>+
>+    makeContextCurrent();
>+    gl::ValidateProgram(program);
>+}
>+
>+void GraphicsContext3D::vertexAttrib1f(GC3Duint index, GC3Dfloat v0)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib1f(index, v0);
>+}
>+
>+void GraphicsContext3D::vertexAttrib1fv(GC3Duint index, const GC3Dfloat* array)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib1fv(index, array);
>+}
>+
>+void GraphicsContext3D::vertexAttrib2f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib2f(index, v0, v1);
>+}
>+
>+void GraphicsContext3D::vertexAttrib2fv(GC3Duint index, const GC3Dfloat* array)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib2fv(index, array);
>+}
>+
>+void GraphicsContext3D::vertexAttrib3f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib3f(index, v0, v1, v2);
>+}
>+
>+void GraphicsContext3D::vertexAttrib3fv(GC3Duint index, const GC3Dfloat* array)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib3fv(index, array);
>+}
>+
>+void GraphicsContext3D::vertexAttrib4f(GC3Duint index, GC3Dfloat v0, GC3Dfloat v1, GC3Dfloat v2, GC3Dfloat v3)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib4f(index, v0, v1, v2, v3);
>+}
>+
>+void GraphicsContext3D::vertexAttrib4fv(GC3Duint index, const GC3Dfloat* array)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttrib4fv(index, array);
>+}
>+
>+void GraphicsContext3D::vertexAttribPointer(GC3Duint index, GC3Dint size, GC3Denum type, GC3Dboolean normalized, GC3Dsizei stride, GC3Dintptr offset)
>+{
>+    makeContextCurrent();
>+    gl::VertexAttribPointer(index, size, type, normalized, stride, reinterpret_cast<GLvoid*>(static_cast<intptr_t>(offset)));
>+}
>+
>+void GraphicsContext3D::viewport(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height)
>+{
>+    makeContextCurrent();
>+    gl::Viewport(x, y, width, height);
>+}
>+
>+Platform3DObject GraphicsContext3D::createVertexArray()
>+{
>+    makeContextCurrent();
>+    GLuint array = 0;
>+    gl::GenVertexArrays(1, &array);
>+    return array;
>+}
>+
>+void GraphicsContext3D::deleteVertexArray(Platform3DObject array)
>+{
>+    if (!array)
>+        return;
>+    makeContextCurrent();
>+    gl::DeleteVertexArrays(1, &array);
>+}
>+
>+GC3Dboolean GraphicsContext3D::isVertexArray(Platform3DObject array)
>+{
>+    if (!array)
>+        return GL_FALSE;
>+    makeContextCurrent();
>+    return gl::IsVertexArray(array);
>+}
>+
>+void GraphicsContext3D::bindVertexArray(Platform3DObject array)
>+{
>+    makeContextCurrent();
>+    gl::BindVertexArray(array);
>+}
>+
>+void GraphicsContext3D::getBooleanv(GC3Denum pname, GC3Dboolean* value)
>+{
>+    makeContextCurrent();
>+    gl::GetBooleanv(pname, value);
>+}
>+
>+void GraphicsContext3D::getBufferParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetBufferParameteriv(target, pname, value);
>+}
>+
>+void GraphicsContext3D::getFloatv(GC3Denum pname, GC3Dfloat* value)
>+{
>+    makeContextCurrent();
>+    gl::GetFloatv(pname, value);
>+}
>+    
>+void GraphicsContext3D::getInteger64v(GC3Denum pname, GC3Dint64* value)
>+{
>+    UNUSED_PARAM(pname);
>+    makeContextCurrent();
>+    *value = 0;
>+    // FIXME 141178: Before enabling this we must first switch over to using gl3.h and creating and initialing the WebGL2 context using OpenGL ES 3.0.
>+    // gl::GetInteger64v(pname, value);
>+}
>+
>+void GraphicsContext3D::getFramebufferAttachmentParameteriv(GC3Denum target, GC3Denum attachment, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    if (attachment == DEPTH_STENCIL_ATTACHMENT)
>+        attachment = DEPTH_ATTACHMENT; // Or STENCIL_ATTACHMENT, either works.
>+    gl::GetFramebufferAttachmentParameteriv(target, attachment, pname, value);
>+}
>+
>+void GraphicsContext3D::getProgramiv(Platform3DObject program, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetProgramiv(program, pname, value);
>+}
>+
>+void GraphicsContext3D::getNonBuiltInActiveSymbolCount(Platform3DObject program, GC3Denum pname, GC3Dint* value)
>+{
>+    ASSERT(ACTIVE_ATTRIBUTES == pname || ACTIVE_UNIFORMS == pname);
>+    if (!value)
>+        return;
>+
>+    makeContextCurrent();
>+    const auto& result = m_shaderProgramSymbolCountMap.find(program);
>+    if (result != m_shaderProgramSymbolCountMap.end()) {
>+        *value = result->value.countForType(pname);
>+        return;
>+    }
>+
>+    m_shaderProgramSymbolCountMap.set(program, ActiveShaderSymbolCounts());
>+    ActiveShaderSymbolCounts& symbolCounts = m_shaderProgramSymbolCountMap.find(program)->value;
>+
>+    // Retrieve the active attributes, build a filtered count, and a mapping of
>+    // our internal attributes indexes to the real unfiltered indexes inside OpenGL.
>+    GC3Dint attributeCount = 0;
>+    gl::GetProgramiv(program, ACTIVE_ATTRIBUTES, &attributeCount);
>+    for (GC3Dint i = 0; i < attributeCount; ++i) {
>+        ActiveInfo info;
>+        getActiveAttribImpl(program, i, info);
>+        if (info.name.startsWith("gl_"))
>+            continue;
>+
>+        symbolCounts.filteredToActualAttributeIndexMap.append(i);
>+    }
>+    
>+    // Do the same for uniforms.
>+    GC3Dint uniformCount = 0;
>+    gl::GetProgramiv(program, ACTIVE_UNIFORMS, &uniformCount);
>+    for (GC3Dint i = 0; i < uniformCount; ++i) {
>+        ActiveInfo info;
>+        getActiveUniformImpl(program, i, info);
>+        if (info.name.startsWith("gl_"))
>+            continue;
>+        
>+        symbolCounts.filteredToActualUniformIndexMap.append(i);
>+    }
>+    
>+    *value = symbolCounts.countForType(pname);
>+}
>+
>+String GraphicsContext3D::getUnmangledInfoLog(Platform3DObject shaders[2], GC3Dsizei count, const String& log)
>+{
>+    LOG(WebGL, "Original ShaderInfoLog:\n%s", log.utf8().data());
>+
>+    JSC::Yarr::RegularExpression regExp("webgl_[0123456789abcdefABCDEF]+");
>+
>+    StringBuilder processedLog;
>+    
>+    // ANGLE inserts a "#extension" line into the shader source that
>+    // causes a warning in some compilers. There is no point showing
>+    // this warning to the user since they didn't write the code that
>+    // is causing it.
>+    static const NeverDestroyed<String> angleWarning { "WARNING: 0:1: extension 'GL_ARB_gpu_shader5' is not supported\n"_s };
>+    int startFrom = log.startsWith(angleWarning) ? angleWarning.get().length() : 0;
>+    int matchedLength = 0;
>+
>+    do {
>+        int start = regExp.match(log, startFrom, &matchedLength);
>+        if (start == -1)
>+            break;
>+
>+        processedLog.append(log.substring(startFrom, start - startFrom));
>+        startFrom = start + matchedLength;
>+
>+        const String& mangledSymbol = log.substring(start, matchedLength);
>+        const String& mappedSymbol = mappedSymbolName(shaders, count, mangledSymbol);
>+        LOG(WebGL, "Demangling: %s to %s", mangledSymbol.utf8().data(), mappedSymbol.utf8().data());
>+        processedLog.append(mappedSymbol);
>+    } while (startFrom < static_cast<int>(log.length()));
>+
>+    processedLog.append(log.substring(startFrom, log.length() - startFrom));
>+
>+    LOG(WebGL, "Unmangled ShaderInfoLog:\n%s", processedLog.toString().utf8().data());
>+    return processedLog.toString();
>+}
>+
>+String GraphicsContext3D::getProgramInfoLog(Platform3DObject program)
>+{
>+    ASSERT(program);
>+
>+    makeContextCurrent();
>+    GLint length = 0;
>+    gl::GetProgramiv(program, GL_INFO_LOG_LENGTH, &length);
>+    if (!length)
>+        return String(); 
>+
>+    GLsizei size = 0;
>+    Vector<GLchar> info(length);
>+    gl::GetProgramInfoLog(program, length, &size, info.data());
>+
>+    GC3Dsizei count;
>+    Platform3DObject shaders[2];
>+    getAttachedShaders(program, 2, &count, shaders);
>+
>+    return getUnmangledInfoLog(shaders, count, String(info.data(), size));
>+}
>+
>+void GraphicsContext3D::getRenderbufferParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetRenderbufferParameteriv(target, pname, value);
>+}
>+
>+void GraphicsContext3D::getShaderiv(Platform3DObject shader, GC3Denum pname, GC3Dint* value)
>+{
>+    ASSERT(shader);
>+
>+    makeContextCurrent();
>+
>+    const auto& result = m_shaderSourceMap.find(shader);
>+    
>+    switch (pname) {
>+    case DELETE_STATUS:
>+    case SHADER_TYPE:
>+        gl::GetShaderiv(shader, pname, value);
>+        break;
>+    case COMPILE_STATUS:
>+        if (result == m_shaderSourceMap.end()) {
>+            *value = static_cast<int>(false);
>+            return;
>+        }
>+        *value = static_cast<int>(result->value.isValid);
>+        break;
>+    case INFO_LOG_LENGTH:
>+        if (result == m_shaderSourceMap.end()) {
>+            *value = 0;
>+            return;
>+        }
>+        *value = getShaderInfoLog(shader).length();
>+        break;
>+    case SHADER_SOURCE_LENGTH:
>+        *value = getShaderSource(shader).length();
>+        break;
>+    default:
>+        synthesizeGLError(INVALID_ENUM);
>+    }
>+}
>+
>+String GraphicsContext3D::getShaderInfoLog(Platform3DObject shader)
>+{
>+    ASSERT(shader);
>+
>+    makeContextCurrent();
>+
>+    const auto& result = m_shaderSourceMap.find(shader);
>+    if (result == m_shaderSourceMap.end())
>+        return String(); 
>+
>+    const ShaderSourceEntry& entry = result->value;
>+    if (!entry.isValid)
>+        return entry.log;
>+
>+    GLint length = 0;
>+    gl::GetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
>+    if (!length)
>+        return String(); 
>+
>+    GLsizei size = 0;
>+    Vector<GLchar> info(length);
>+    gl::GetShaderInfoLog(shader, length, &size, info.data());
>+
>+    Platform3DObject shaders[2] = { shader, 0 };
>+    return getUnmangledInfoLog(shaders, 1, String(info.data(), size));
>+}
>+
>+String GraphicsContext3D::getShaderSource(Platform3DObject shader)
>+{
>+    ASSERT(shader);
>+
>+    makeContextCurrent();
>+
>+    const auto& result = m_shaderSourceMap.find(shader);
>+    if (result == m_shaderSourceMap.end())
>+        return String(); 
>+
>+    return result->value.source;
>+}
>+
>+
>+void GraphicsContext3D::getTexParameterfv(GC3Denum target, GC3Denum pname, GC3Dfloat* value)
>+{
>+    makeContextCurrent();
>+    gl::GetTexParameterfv(target, pname, value);
>+}
>+
>+void GraphicsContext3D::getTexParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetTexParameteriv(target, pname, value);
>+}
>+
>+void GraphicsContext3D::getUniformfv(Platform3DObject program, GC3Dint location, GC3Dfloat* value)
>+{
>+    makeContextCurrent();
>+    gl::GetUniformfv(program, location, value);
>+}
>+
>+void GraphicsContext3D::getUniformiv(Platform3DObject program, GC3Dint location, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetUniformiv(program, location, value);
>+}
>+
>+GC3Dint GraphicsContext3D::getUniformLocation(Platform3DObject program, const String& name)
>+{
>+    ASSERT(program);
>+
>+    makeContextCurrent();
>+
>+    String mappedName = mappedSymbolName(program, SHADER_SYMBOL_TYPE_UNIFORM, name);
>+    LOG(WebGL, "::getUniformLocation is mapping %s to %s", name.utf8().data(), mappedName.utf8().data());
>+    return gl::GetUniformLocation(program, mappedName.utf8().data());
>+}
>+
>+void GraphicsContext3D::getVertexAttribfv(GC3Duint index, GC3Denum pname, GC3Dfloat* value)
>+{
>+    makeContextCurrent();
>+    gl::GetVertexAttribfv(index, pname, value);
>+}
>+
>+void GraphicsContext3D::getVertexAttribiv(GC3Duint index, GC3Denum pname, GC3Dint* value)
>+{
>+    makeContextCurrent();
>+    gl::GetVertexAttribiv(index, pname, value);
>+}
>+
>+GC3Dsizeiptr GraphicsContext3D::getVertexAttribOffset(GC3Duint index, GC3Denum pname)
>+{
>+    makeContextCurrent();
>+
>+    GLvoid* pointer = 0;
>+    gl::GetVertexAttribPointerv(index, pname, &pointer);
>+    return static_cast<GC3Dsizeiptr>(reinterpret_cast<intptr_t>(pointer));
>+}
>+
>+void GraphicsContext3D::texSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoff, GC3Dint yoff, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, const void* pixels)
>+{
>+    makeContextCurrent();
>+
>+    // FIXME: we will need to deal with PixelStore params when dealing with image buffers that differ from the subimage size.
>+    gl::TexSubImage2D(target, level, xoff, yoff, width, height, format, type, pixels);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::compressedTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Dsizei imageSize, const void* data)
>+{
>+    makeContextCurrent();
>+    gl::CompressedTexImage2D(target, level, internalformat, width, height, border, imageSize, data);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::compressedTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Dsizei imageSize, const void* data)
>+{
>+    makeContextCurrent();
>+    gl::CompressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, imageSize, data);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+Platform3DObject GraphicsContext3D::createBuffer()
>+{
>+    makeContextCurrent();
>+    GLuint o = 0;
>+    glGenBuffers(1, &o);
>+    return o;
>+}
>+
>+Platform3DObject GraphicsContext3D::createFramebuffer()
>+{
>+    makeContextCurrent();
>+    GLuint o = 0;
>+    glGenFramebuffers(1, &o);
>+    return o;
>+}
>+
>+Platform3DObject GraphicsContext3D::createProgram()
>+{
>+    makeContextCurrent();
>+    return glCreateProgram();
>+}
>+
>+Platform3DObject GraphicsContext3D::createRenderbuffer()
>+{
>+    makeContextCurrent();
>+    GLuint o = 0;
>+    glGenRenderbuffers(1, &o);
>+    return o;
>+}
>+
>+Platform3DObject GraphicsContext3D::createShader(GC3Denum type)
>+{
>+    makeContextCurrent();
>+    return glCreateShader((type == FRAGMENT_SHADER) ? GL_FRAGMENT_SHADER : GL_VERTEX_SHADER);
>+}
>+
>+Platform3DObject GraphicsContext3D::createTexture()
>+{
>+    makeContextCurrent();
>+    GLuint o = 0;
>+    glGenTextures(1, &o);
>+    m_state.textureSeedCount.add(o);
>+    return o;
>+}
>+
>+void GraphicsContext3D::deleteBuffer(Platform3DObject buffer)
>+{
>+    makeContextCurrent();
>+    glDeleteBuffers(1, &buffer);
>+}
>+
>+void GraphicsContext3D::deleteFramebuffer(Platform3DObject framebuffer)
>+{
>+    makeContextCurrent();
>+    if (framebuffer == m_state.boundFBO) {
>+        // Make sure the framebuffer is not going to be used for drawing
>+        // operations after it gets deleted.
>+        bindFramebuffer(FRAMEBUFFER, 0);
>+    }
>+    glDeleteFramebuffers(1, &framebuffer);
>+}
>+
>+void GraphicsContext3D::deleteProgram(Platform3DObject program)
>+{
>+    makeContextCurrent();
>+    m_shaderProgramSymbolCountMap.remove(program);
>+    glDeleteProgram(program);
>+}
>+
>+void GraphicsContext3D::deleteRenderbuffer(Platform3DObject renderbuffer)
>+{
>+    makeContextCurrent();
>+    glDeleteRenderbuffers(1, &renderbuffer);
>+}
>+
>+void GraphicsContext3D::deleteShader(Platform3DObject shader)
>+{
>+    makeContextCurrent();
>+    glDeleteShader(shader);
>+}
>+
>+void GraphicsContext3D::deleteTexture(Platform3DObject texture)
>+{
>+    makeContextCurrent();
>+    m_state.boundTextureMap.removeIf([texture] (auto& keyValue) {
>+        return keyValue.value.first == texture;
>+    });
>+    glDeleteTextures(1, &texture);
>+    m_state.textureSeedCount.removeAll(texture);
>+}
>+
>+void GraphicsContext3D::synthesizeGLError(GC3Denum error)
>+{
>+    // Need to move the current errors to the synthetic error list to
>+    // preserve the order of errors, so a caller to getError will get
>+    // any errors from glError before the error we are synthesizing.
>+    moveErrorsToSyntheticErrorList();
>+    m_syntheticErrors.add(error);
>+}
>+
>+void GraphicsContext3D::markContextChanged()
>+{
>+    m_layerComposited = false;
>+}
>+
>+void GraphicsContext3D::markLayerComposited()
>+{
>+    m_layerComposited = true;
>+
>+    for (auto* client : copyToVector(m_clients))
>+        client->didComposite();
>+}
>+
>+bool GraphicsContext3D::layerComposited() const
>+{
>+    return m_layerComposited;
>+}
>+
>+void GraphicsContext3D::forceContextLost()
>+{
>+    for (auto* client : copyToVector(m_clients))
>+        client->forceContextLost();
>+}
>+
>+void GraphicsContext3D::recycleContext()
>+{
>+    for (auto* client : copyToVector(m_clients))
>+        client->recycleContext();
>+}
>+
>+void GraphicsContext3D::dispatchContextChangedNotification()
>+{
>+    for (auto* client : copyToVector(m_clients))
>+        client->dispatchContextChangedNotification();
>+}
>+
>+void GraphicsContext3D::texImage2DDirect(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, const void* pixels)
>+{
>+    makeContextCurrent();
>+    gl::TexImage2D(target, level, internalformat, width, height, border, format, type, pixels);
>+    m_state.textureSeedCount.add(m_state.currentBoundTexture());
>+}
>+
>+void GraphicsContext3D::drawArraysInstanced(GC3Denum mode, GC3Dint first, GC3Dsizei count, GC3Dsizei primcount)
>+{
>+    getExtensions().drawArraysInstanced(mode, first, count, primcount);
>+    checkGPUStatus();
>+}
>+
>+void GraphicsContext3D::drawElementsInstanced(GC3Denum mode, GC3Dsizei count, GC3Denum type, GC3Dintptr offset, GC3Dsizei primcount)
>+{
>+    getExtensions().drawElementsInstanced(mode, count, type, offset, primcount);
>+    checkGPUStatus();
>+}
>+
>+void GraphicsContext3D::vertexAttribDivisor(GC3Duint index, GC3Duint divisor)
>+{
>+    getExtensions().vertexAttribDivisor(index, divisor);
>+}
>+
>+}
>+
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>diff --git a/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.cpp b/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..bb958da02a0d64f9d432d3bbbc1f9fada4e8bf2b
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.cpp
>@@ -0,0 +1,63 @@
>+/*
>+ * Copyright (C) 2013 Apple Inc. All rights reserved.
>+ * Copyright (C) 2011 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>+#include "TemporaryANGLESetting.h"
>+
>+#include <ANGLE/entry_points_gles_2_0_autogen.h>
>+
>+namespace WebCore {
>+
>+TemporaryANGLESetting::TemporaryANGLESetting(GLenum capability, GLenum scopedState)
>+    : m_capability(capability)
>+    , m_scopedState(scopedState)
>+{
>+    m_originalState = gl::IsEnabled(m_capability);
>+    if (m_originalState == m_scopedState)
>+        return;
>+
>+    if (GL_TRUE == m_scopedState)
>+        gl::Enable(m_capability);
>+    else
>+        gl::Disable(m_capability);
>+}
>+
>+TemporaryANGLESetting::~TemporaryANGLESetting()
>+{
>+    if (m_originalState == m_scopedState)
>+        return;
>+
>+    if (GL_TRUE == m_originalState)
>+        gl::Enable(m_capability);
>+    else
>+        gl::Disable(m_capability);
>+}
>+
>+}
>+
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && USE(ANGLE)
>diff --git a/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.h b/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8f6cfe1eee90cccb5ed171862e9cfb1448c818ce
>--- /dev/null
>+++ b/Source/WebCore/platform/graphics/angle/TemporaryANGLESetting.h
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2013 Apple Inc. All rights reserved.
>+ * Copyright (C) 2011 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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.
>+ */
>+
>+#pragma once
>+
>+#include "GraphicsTypes3D.h"
>+
>+#include <wtf/Noncopyable.h>
>+
>+namespace WebCore {
>+
>+// TemporaryANGLESetting<> is useful for temporarily disabling (or enabling) a particular OpenGL
>+// feature with a particular scope. A TemporaryANGLESetting<> object returns the flag to its original
>+// value upon destruction, making it an alternative to checking, clearing, and resetting each flag
>+// at all of a block's exit points.
>+//
>+// Based on WTF::SetForScope<>
>+
>+class TemporaryANGLESetting {
>+    WTF_MAKE_NONCOPYABLE(TemporaryANGLESetting);
>+public:
>+    TemporaryANGLESetting(GC3Denum capability, GC3Denum scopedState);
>+    ~TemporaryANGLESetting();
>+
>+private:
>+    const GC3Denum m_capability;
>+    const GC3Denum m_scopedState;
>+    GC3Denum m_originalState;
>+};
>+
>+}
>+
>+using WebCore::TemporaryANGLESetting;
>diff --git a/Source/WebCore/platform/graphics/cocoa/GraphicsContext3DCocoa.mm b/Source/WebCore/platform/graphics/cocoa/GraphicsContext3DCocoa.mm
>index 77c5d6ca67c628ab49671de14b96faa77e299cda..2defba242747635016d4cb1006aaf32a6a4df702 100644
>--- a/Source/WebCore/platform/graphics/cocoa/GraphicsContext3DCocoa.mm
>+++ b/Source/WebCore/platform/graphics/cocoa/GraphicsContext3DCocoa.mm
>@@ -28,12 +28,11 @@
> #if ENABLE(GRAPHICS_CONTEXT_3D)
> #import "GraphicsContext3D.h"
> 
>-#if PLATFORM(IOS_FAMILY)
>+#if PLATFORM(IOS_FAMILY) && !USE(ANGLE)
> #import "GraphicsContext3DIOS.h"
> #endif
> 
> #import "CanvasRenderingContext.h"
>-#import "Extensions3DOpenGL.h"
> #import "GraphicsContext.h"
> #import "GraphicsContext3DManager.h"
> #import "HTMLCanvasElement.h"
>@@ -56,10 +55,18 @@
> #import <OpenGLES/ES2/glext.h>
> #import <QuartzCore/QuartzCore.h>
> #import <pal/spi/ios/OpenGLESSPI.h>
>-#else
>+#elif USE(OPENGL)
> #import <IOKit/IOKitLib.h>
> #import <OpenGL/CGLRenderers.h>
> #import <OpenGL/gl.h>
>+#elif USE(ANGLE)
>+#include <ANGLE/entry_points_gles_2_0_autogen.h>
>+#endif
>+
>+#if USE(OPENGL_ES) || USE(OPENGL)
>+#include "Extensions3DOpenGL.h"
>+#elif USE(ANGLE)
>+#include "Extensions3DANGLE.h"
> #endif
> 
> #if PLATFORM(MAC)
>@@ -161,7 +168,7 @@ Ref<GraphicsContext3D> GraphicsContext3D::createShared(GraphicsContext3D& shared
>     return context;
> }
> 
>-#if PLATFORM(MAC)
>+#if PLATFORM(MAC) && USE(OPENGL)
> 
> #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 101300
> static void setGPUByRegistryID(PlatformGraphicsContext3D contextObj, CGLPixelFormatObj pixelFormatObj, IORegistryGPUID preferredGPUID)
>@@ -240,12 +247,18 @@ static void setGPUByDisplayMask(PlatformGraphicsContext3D contextObj, CGLPixelFo
> }
> #endif
> 
>-#endif // !PLATFORM(MAC)
>+#endif // PLATFORM(MAC) && USE(OPENGL)
> 
> GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWindow* hostWindow, GraphicsContext3D::RenderStyle, GraphicsContext3D* sharedContext)
>     : m_attrs(attrs)
>     , m_private(std::make_unique<GraphicsContext3DPrivate>(this))
> {
>+#if USE(ANGLE)
>+    if (m_attrs.isWebGL2)
>+        m_compiler = ANGLEWebKitBridge(SH_ESSL_OUTPUT, SH_WEBGL2_SPEC);
>+    else
>+        m_compiler = ANGLEWebKitBridge(SH_ESSL_OUTPUT);
>+#else
> #if PLATFORM(IOS_FAMILY)
>     if (m_attrs.isWebGL2)
>         m_compiler = ANGLEWebKitBridge(SH_ESSL_OUTPUT, SH_WEBGL2_SPEC);
>@@ -254,7 +267,8 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
> #else
>     if (m_attrs.isWebGL2)
>         m_compiler = ANGLEWebKitBridge(SH_GLSL_410_CORE_OUTPUT, SH_WEBGL2_SPEC);
>-#endif
>+#endif // PLATFORM(IOS_FAMILY)
>+#endif // USE(ANGLE)
> 
> #if USE(OPENGL_ES)
>     UNUSED_PARAM(hostWindow);
>@@ -267,7 +281,7 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
> 
>     if (m_attrs.isWebGL2)
>         ::glEnable(GraphicsContext3D::PRIMITIVE_RESTART_FIXED_INDEX);
>-#else
>+#elif USE(OPENGL)
>     Vector<CGLPixelFormatAttribute> attribs;
>     CGLPixelFormatObj pixelFormatObj = 0;
>     GLint numPixelFormats = 0;
>@@ -353,7 +367,13 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
>     if (m_isForWebGL2)
>         ::glEnable(GraphicsContext3D::PRIMITIVE_RESTART);
> 
>-#endif // !USE(OPENGL_ES)
>+#elif USE(ANGLE)
>+
>+    // FIXME: implement context setup via ANGLE.
>+    UNUSED_PARAM(hostWindow);
>+    UNUSED_PARAM(sharedContext);
>+
>+#endif
>     
>     validateAttributes();
> 
>@@ -373,7 +393,7 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
>     // Create the texture that will be used for the framebuffer.
> #if USE(OPENGL_ES)
>     ::glGenRenderbuffers(1, &m_texture);
>-#else
>+#elif USE(OPENGL)
>     ::glGenTextures(1, &m_texture);
>     // We bind to GL_TEXTURE_RECTANGLE_EXT rather than TEXTURE_2D because
>     // that's what is required for a texture backed by IOSurface.
>@@ -383,8 +403,13 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
>     ::glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
>     ::glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
>     ::glBindTexture(GL_TEXTURE_RECTANGLE_EXT, 0);
>+#elif USE(ANGLE)
>+    // FIXME: implement back buffer setup via ANGLE.
>+#else
>+#error Unsupported configuration
> #endif
> 
>+#if USE(OPENGL) || USE(OPENGL_ES)
>     // Create the framebuffer object.
>     ::glGenFramebuffersEXT(1, &m_fbo);
>     ::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
>@@ -402,7 +427,8 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
>         if (m_attrs.stencil || m_attrs.depth)
>             ::glGenRenderbuffersEXT(1, &m_multisampleDepthStencilBuffer);
>     }
>-    
>+#endif // USE(ANGLE) || USE(OPENGL_ES)
>+
>     // ANGLE initialization.
> 
>     ShBuiltInResources ANGLEResources;
>@@ -431,7 +457,9 @@ GraphicsContext3D::GraphicsContext3D(GraphicsContext3DAttributes attrs, HostWind
>         ::glEnable(GL_POINT_SPRITE);
> #endif
> 
>+#if USE(OPENGL) || USE(OPENGL_ES)
>     ::glClearColor(0, 0, 0, 0);
>+#endif
> 
>     LOG(WebGL, "Created a GraphicsContext3D (%p).", this);
> }
>@@ -445,10 +473,14 @@ GraphicsContext3D::~GraphicsContext3D()
>         makeContextCurrent();
>         [m_contextObj renderbufferStorage:GL_RENDERBUFFER fromDrawable:nil];
>         ::glDeleteRenderbuffers(1, &m_texture);
>-#else
>+#elif USE(OPENGL)
>         CGLSetCurrentContext(m_contextObj);
>         ::glDeleteTextures(1, &m_texture);
>+#elif USE(ANGLE)
>+        // FIXME: make context current via ANGLE.
> #endif
>+
>+#if USE(OPENGL) || USE(OPENGL_ES)
>         if (m_attrs.antialias) {
>             ::glDeleteRenderbuffersEXT(1, &m_multisampleColorBuffer);
>             if (m_attrs.stencil || m_attrs.depth)
>@@ -459,12 +491,16 @@ GraphicsContext3D::~GraphicsContext3D()
>                 ::glDeleteRenderbuffersEXT(1, &m_depthStencilBuffer);
>         }
>         ::glDeleteFramebuffersEXT(1, &m_fbo);
>+#endif
>+
> #if USE(OPENGL_ES)
>         [EAGLContext setCurrentContext:0];
>         [static_cast<EAGLContext*>(m_contextObj) release];
>-#else
>+#elif USE(OPENGL)
>         CGLSetCurrentContext(0);
>         CGLDestroyContext(m_contextObj);
>+#elif USE(ANGLE)
>+        // FIXME: implement context teardown via ANGLE.
> #endif
>         [m_webGLLayer setContext:nullptr];
>     }
>@@ -496,10 +532,12 @@ bool GraphicsContext3D::makeContextCurrent()
> #if USE(OPENGL_ES)
>     if ([EAGLContext currentContext] != m_contextObj)
>         return [EAGLContext setCurrentContext:static_cast<EAGLContext*>(m_contextObj)];
>-#else
>+#elif USE(OPENGL)
>     CGLContextObj currentContext = CGLGetCurrentContext();
>     if (currentContext != m_contextObj)
>         return CGLSetCurrentContext(m_contextObj) == kCGLNoError;
>+#elif USE(ANGLE)
>+    // FIXME: implement making context current via ANGLE.
> #endif
>     return true;
> }
>@@ -512,8 +550,10 @@ void GraphicsContext3D::checkGPUStatus()
>         forceContextLost();
> #if USE(OPENGL)
>         CGLSetCurrentContext(0);
>-#else
>+#elif USE(OPENGL_ES)
>         [EAGLContext setCurrentContext:0];
>+#elif USE(ANGLE)
>+        // FIXME: implement forced context loss via ANGLE.
> #endif
>         return;
>     }
>@@ -536,7 +576,7 @@ void GraphicsContext3D::checkGPUStatus()
>         forceContextLost();
>         CGLSetCurrentContext(0);
>     }
>-#else
>+#elif USE(OPENGL_ES)
>     EAGLContext* currentContext = static_cast<EAGLContext*>(PlatformGraphicsContext3D());
>     [currentContext getParameter:kEAGLCPGPURestartStatus to:&restartStatus];
>     if (restartStatus == kEAGLCPGPURestartStatusCaused || restartStatus == kEAGLCPGPURestartStatusBlacklisted) {
>@@ -544,6 +584,9 @@ void GraphicsContext3D::checkGPUStatus()
>         forceContextLost();
>         [EAGLContext setCurrentContext:0];
>     }
>+#elif USE(ANGLE)
>+    // FIXME: check via KHR_robustness.
>+    restartStatus = 0;
> #endif
> }
> 
>@@ -660,12 +703,19 @@ void GraphicsContext3D::screenDidChange(PlatformDisplayID displayID)
> {
>     if (!m_contextObj)
>         return;
>+#if USE(ANGLE)
>+    UNUSED_PARAM(displayID);
>+#else
> #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 101300
>+    // FIXME: figure out whether to integrate more code into ANGLE to have this effect.
>+#if USE(OPENGL)
>     if (!m_hasSwitchedToHighPerformanceGPU)
>         setGPUByRegistryID(m_contextObj, CGLGetPixelFormat(m_contextObj), gpuIDForDisplay(displayID));
>+#endif
> #else
>     setGPUByDisplayMask(m_contextObj, CGLGetPixelFormat(m_contextObj), displayMaskForDisplay(displayID));
>-#endif
>+#endif // __MAC_OS_X_VERSION_MIN_REQUIRED >= 101300
>+#endif // USE(ANGLE)
> }
> #endif // !PLATFORM(MAC)
> 
>diff --git a/Source/WebCore/platform/graphics/cocoa/WebGLLayer.h b/Source/WebCore/platform/graphics/cocoa/WebGLLayer.h
>index 609222a97b2f4eef1d01cc92bf126e8f327a6b97..234e8e17df729ff5cc781ef67545cededff43213 100644
>--- a/Source/WebCore/platform/graphics/cocoa/WebGLLayer.h
>+++ b/Source/WebCore/platform/graphics/cocoa/WebGLLayer.h
>@@ -38,8 +38,14 @@ ALLOW_DEPRECATED_DECLARATIONS_BEGIN
> 
> #if USE(OPENGL)
> @interface WebGLLayer : CALayer
>-#else
>+#elif USE(OPENGL_ES)
>+@interface WebGLLayer : CAEAGLLayer
>+#elif USE(ANGLE) && PLATFORM(MAC)
>+@interface WebGLLayer : CALayer
>+#elif USE(ANGLE) && PLATFORM(IOS_FAMILY)
> @interface WebGLLayer : CAEAGLLayer
>+#else
>+#error Unsupported platform
> #endif
> {
>     WebCore::GraphicsContext3D* _context;
>diff --git a/Source/WebCore/platform/graphics/cocoa/WebGLLayer.mm b/Source/WebCore/platform/graphics/cocoa/WebGLLayer.mm
>index 8cc9fc427ca1a1568f4322ae2c8c2d7a9a7671c9..f4d2d00a177d7656cd9298fb911a934c08bacf49 100644
>--- a/Source/WebCore/platform/graphics/cocoa/WebGLLayer.mm
>+++ b/Source/WebCore/platform/graphics/cocoa/WebGLLayer.mm
>@@ -136,8 +136,10 @@ static void freeData(void *, const void *data, size_t /* size */)
>         [self reloadValueForKeyPath:@"contents"];
>         [self bindFramebufferToNextAvailableSurface];
>     }
>-#else
>+#elif USE(OPENGL_ES)
>     _context->presentRenderbuffer();
>+#elif USE(ANGLE)
>+    // FIXME: display rendering results via ANGLE.
> #endif
> 
>     _context->markLayerComposited();
>diff --git a/Source/WebCore/platform/graphics/cv/TextureCacheCV.mm b/Source/WebCore/platform/graphics/cv/TextureCacheCV.mm
>index cf95929820a00f9746d97c59748ed9f9a9a264a2..577ec2846392a7215d998aa310d3d8d633f5f1ec 100644
>--- a/Source/WebCore/platform/graphics/cv/TextureCacheCV.mm
>+++ b/Source/WebCore/platform/graphics/cv/TextureCacheCV.mm
>@@ -39,8 +39,12 @@ std::unique_ptr<TextureCacheCV> TextureCacheCV::create(GraphicsContext3D& contex
>     TextureCacheType cache = nullptr;
> #if USE(OPENGL_ES)
>     CVReturn error = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, nullptr, context.platformGraphicsContext3D(), nullptr, &cache);
>-#else
>+#elif USE(OPENGL)
>     CVReturn error = CVOpenGLTextureCacheCreate(kCFAllocatorDefault, nullptr, context.platformGraphicsContext3D(), CGLGetPixelFormat(context.platformGraphicsContext3D()), nullptr, &cache);
>+#elif USE(ANGLE)
>+    // FIXME: figure out how to do this integrating via ANGLE.
>+    UNUSED_PARAM(context);
>+    CVReturn error = kCVReturnSuccess + 1;
> #endif
>     if (error != kCVReturnSuccess)
>         return nullptr;
>@@ -63,7 +67,7 @@ RetainPtr<TextureCacheCV::TextureType> TextureCacheCV::textureFromImage(CVPixelB
>     size_t height = CVPixelBufferGetHeight(image);
>     if (kCVReturnSuccess != CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault, m_cache.get(), image, nullptr, outputTarget, internalFormat, width, height, format, type, level, &bareVideoTexture))
>         return nullptr;
>-#else
>+#elif USE(OPENGL)
>     UNUSED_PARAM(outputTarget);
>     UNUSED_PARAM(level);
>     UNUSED_PARAM(internalFormat);
>@@ -71,6 +75,15 @@ RetainPtr<TextureCacheCV::TextureType> TextureCacheCV::textureFromImage(CVPixelB
>     UNUSED_PARAM(type);
>     if (kCVReturnSuccess != CVOpenGLTextureCacheCreateTextureFromImage(kCFAllocatorDefault, m_cache.get(), image, nullptr, &bareVideoTexture))
>         return nullptr;
>+#elif USE(ANGLE)
>+    // FIXME: figure out how to do this integrating via ANGLE.
>+    UNUSED_PARAM(image);
>+    UNUSED_PARAM(outputTarget);
>+    UNUSED_PARAM(level);
>+    UNUSED_PARAM(internalFormat);
>+    UNUSED_PARAM(format);
>+    UNUSED_PARAM(type);
>+    return nullptr;
> #endif
>     RetainPtr<TextureType> videoTexture = adoptCF(bareVideoTexture);
> 
>diff --git a/Source/WebCore/platform/graphics/cv/VideoTextureCopierCV.cpp b/Source/WebCore/platform/graphics/cv/VideoTextureCopierCV.cpp
>index ab59c08b983525fd545e0d972ff0dd6624765375..d6976544920502a7cdfddbb9c7b35698e192af51 100644
>--- a/Source/WebCore/platform/graphics/cv/VideoTextureCopierCV.cpp
>+++ b/Source/WebCore/platform/graphics/cv/VideoTextureCopierCV.cpp
>@@ -403,62 +403,62 @@ static StringMap& enumToStringMap()
>     static NeverDestroyed<StringMap> map;
>     if (map.get().empty()) {
>         StringMap stringMap;
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGB));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGBA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_LUMINANCE_ALPHA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_LUMINANCE));
>-        map.get().emplace(STRINGIFY_PAIR(GL_ALPHA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R16F));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R32F));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R8UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R8I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R16UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R16I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R32UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_R32I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG16F));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG32F));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG8UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG8I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG16UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG16I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG32UI));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG32I));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGB8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_SRGB8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGBA8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_SRGB8_ALPHA8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGBA4));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGB10_A2));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH_COMPONENT16));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH_COMPONENT24));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH_COMPONENT32F));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH24_STENCIL8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH32F_STENCIL8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGB));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RGBA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_LUMINANCE_ALPHA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_LUMINANCE));
>-        map.get().emplace(STRINGIFY_PAIR(GL_ALPHA));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RED));
>-        map.get().emplace(STRINGIFY_PAIR(GL_RG_INTEGER));
>-        map.get().emplace(STRINGIFY_PAIR(GL_DEPTH_STENCIL));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_BYTE));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_SHORT_5_6_5));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_SHORT_4_4_4_4));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_SHORT_5_5_5_1));
>-        map.get().emplace(STRINGIFY_PAIR(GL_BYTE));
>-        map.get().emplace(STRINGIFY_PAIR(GL_HALF_FLOAT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_FLOAT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_SHORT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_SHORT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_INT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_INT));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_INT_2_10_10_10_REV));
>-        map.get().emplace(STRINGIFY_PAIR(GL_UNSIGNED_INT_24_8));
>-        map.get().emplace(STRINGIFY_PAIR(GL_FLOAT_32_UNSIGNED_INT_24_8_REV));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGB));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGBA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::LUMINANCE_ALPHA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::LUMINANCE));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::ALPHA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R16F));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R32F));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R8UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R8I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R16UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R16I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R32UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::R32I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG16F));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG32F));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG8UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG8I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG16UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG16I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG32UI));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG32I));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGB8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::SRGB8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGBA8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::SRGB8_ALPHA8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGBA4));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGB10_A2));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH_COMPONENT16));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH_COMPONENT24));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH_COMPONENT32F));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH24_STENCIL8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH32F_STENCIL8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGB));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RGBA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::LUMINANCE_ALPHA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::LUMINANCE));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::ALPHA));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RED));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::RG_INTEGER));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::DEPTH_STENCIL));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_BYTE));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_SHORT_5_6_5));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_SHORT_4_4_4_4));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_SHORT_5_5_5_1));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::BYTE));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::HALF_FLOAT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::FLOAT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_SHORT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::SHORT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_INT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::INT));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_INT_2_10_10_10_REV));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::UNSIGNED_INT_24_8));
>+        map.get().emplace(STRINGIFY_PAIR(GraphicsContext3D::FLOAT_32_UNSIGNED_INT_24_8_REV));
> 
> #if USE(OPENGL_ES)
>         map.get().emplace(STRINGIFY_PAIR(GL_RED_INTEGER));
>@@ -530,8 +530,13 @@ bool VideoTextureCopierCV::initializeContextObjects()
> #if USE(OPENGL_ES)
>     fragmentShaderSource.appendLiteral("precision mediump float;\n");
>     fragmentShaderSource.appendLiteral("uniform sampler2D u_texture;\n");
>-#else
>+#elif USE(OPENGL)
>     fragmentShaderSource.appendLiteral("uniform sampler2DRect u_texture;\n");
>+#elif USE(ANGLE)
>+    // FIXME: determine how to access rectangular textures via ANGLE.
>+    ASSERT_NOT_REACHED();
>+#else
>+#error Unsupported configuration
> #endif
>     fragmentShaderSource.appendLiteral("varying vec2 v_texturePosition;\n");
>     fragmentShaderSource.appendLiteral("uniform int u_premultiply;\n");
>@@ -541,8 +546,13 @@ bool VideoTextureCopierCV::initializeContextObjects()
>     fragmentShaderSource.appendLiteral("    vec2 texPos = vec2(v_texturePosition.x * u_textureDimensions.x, v_texturePosition.y * u_textureDimensions.y);\n");
> #if USE(OPENGL_ES)
>     fragmentShaderSource.appendLiteral("    vec4 color = texture2D(u_texture, texPos);\n");
>-#else
>+#elif USE(OPENGL)
>     fragmentShaderSource.appendLiteral("    vec4 color = texture2DRect(u_texture, texPos);\n");
>+#elif USE(ANGLE)
>+    // FIXME: determine how to access rectangular textures via ANGLE.
>+    ASSERT_NOT_REACHED();
>+#else
>+#error Unsupported configuration
> #endif
>     fragmentShaderSource.appendLiteral("    if (u_swapColorChannels == 1) {\n");
>     fragmentShaderSource.appendLiteral("        color.rgba = color.bgra;\n");
>@@ -623,9 +633,13 @@ bool VideoTextureCopierCV::initializeUVContextObjects()
> #if USE(OPENGL_ES)
>         "   v_yTextureCoordinate = normalizedPosition;\n"
>         "   v_uvTextureCoordinate = normalizedPosition;\n"
>-#else
>+#elif USE(OPENGL)
>         "   v_yTextureCoordinate = normalizedPosition * u_yTextureSize;\n"
>         "   v_uvTextureCoordinate = normalizedPosition * u_uvTextureSize;\n"
>+#elif USE(ANGLE)
>+        // FIXME: determine how to access rectangular textures via ANGLE.
>+#else
>+#error Unsupported configuration
> #endif
>         "}\n"_s
>     };
>@@ -647,9 +661,13 @@ bool VideoTextureCopierCV::initializeUVContextObjects()
>         "precision mediump float;\n"
>         "#define SAMPLERTYPE sampler2D\n"
>         "#define TEXTUREFUNC texture2D\n"
>-#else
>+#elif USE(OPENGL)
>         "#define SAMPLERTYPE sampler2DRect\n"
>         "#define TEXTUREFUNC texture2DRect\n"
>+#elif USE(ANGLE)
>+        // FIXME: determine how to access rectangular textures via ANGLE.
>+#else
>+#error Unsupported configuration
> #endif
>         "uniform SAMPLERTYPE u_yTexture;\n"
>         "uniform SAMPLERTYPE u_uvTexture;\n"
>@@ -790,8 +808,13 @@ bool VideoTextureCopierCV::copyImageToPlatformTexture(CVPixelBufferRef image, si
> 
> #if USE(OPENGL_ES)
>     GC3Denum videoTextureTarget = GraphicsContext3D::TEXTURE_2D;
>-#else
>+#elif USE(OPENGL)
>     GC3Denum videoTextureTarget = GL_TEXTURE_RECTANGLE_ARB;
>+#elif USE(ANGLE)
>+    // FIXME: determine how to access rectangular textures via ANGLE.
>+    GC3Denum videoTextureTarget = GraphicsContext3D::TEXTURE_2D;
>+#else
>+#error Unsupported configuration
> #endif
>     auto uvTexture = m_context->createTexture();
>     m_context->activeTexture(GraphicsContext3D::TEXTURE1);
>@@ -800,7 +823,7 @@ bool VideoTextureCopierCV::copyImageToPlatformTexture(CVPixelBufferRef image, si
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
>-    if (!m_context->texImageIOSurface2D(videoTextureTarget, GL_RG, uvPlaneWidth, uvPlaneHeight, GL_RG, GL_UNSIGNED_BYTE, surface, 1)) {
>+    if (!m_context->texImageIOSurface2D(videoTextureTarget, GraphicsContext3D::RG, uvPlaneWidth, uvPlaneHeight, GraphicsContext3D::RG, GraphicsContext3D::UNSIGNED_BYTE, surface, 1)) {
>         m_context->deleteTexture(uvTexture);
>         return false;
>     }
>@@ -812,7 +835,7 @@ bool VideoTextureCopierCV::copyImageToPlatformTexture(CVPixelBufferRef image, si
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
>     m_context->texParameteri(videoTextureTarget, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
>-    if (!m_context->texImageIOSurface2D(videoTextureTarget, GL_LUMINANCE, yPlaneWidth, yPlaneHeight, GL_LUMINANCE, GL_UNSIGNED_BYTE, surface, 0)) {
>+    if (!m_context->texImageIOSurface2D(videoTextureTarget, GraphicsContext3D::LUMINANCE, yPlaneWidth, yPlaneHeight, GraphicsContext3D::LUMINANCE, GraphicsContext3D::UNSIGNED_BYTE, surface, 0)) {
>         m_context->deleteTexture(yTexture);
>         m_context->deleteTexture(uvTexture);
>         return false;
>@@ -867,10 +890,16 @@ bool VideoTextureCopierCV::copyVideoTextureToPlatformTexture(TextureType inputVi
>     Platform3DObject videoTextureName = CVOpenGLESTextureGetName(inputVideoTexture);
>     GC3Denum videoTextureTarget = CVOpenGLESTextureGetTarget(inputVideoTexture);
>     CVOpenGLESTextureGetCleanTexCoords(inputVideoTexture, lowerLeft, lowerRight, upperRight, upperLeft);
>-#else
>+#elif USE(OPENGL)
>+    Platform3DObject videoTextureName = CVOpenGLTextureGetName(inputVideoTexture);
>+    GC3Denum videoTextureTarget = CVOpenGLTextureGetTarget(inputVideoTexture);
>+    CVOpenGLTextureGetCleanTexCoords(inputVideoTexture, lowerLeft, lowerRight, upperRight, upperLeft);
>+#elif USE(ANGLE)
>     Platform3DObject videoTextureName = CVOpenGLTextureGetName(inputVideoTexture);
>     GC3Denum videoTextureTarget = CVOpenGLTextureGetTarget(inputVideoTexture);
>     CVOpenGLTextureGetCleanTexCoords(inputVideoTexture, lowerLeft, lowerRight, upperRight, upperLeft);
>+    // FIXME: determine how to access rectangular textures via ANGLE.
>+    ASSERT_NOT_REACHED();
> #endif
> 
>     if (lowerLeft[1] < upperRight[1])
>diff --git a/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGL.cpp b/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGL.cpp
>index f40fe6ae637dec2d4b9a15b63321807e594aff72..13119ffa75e1c307d0834a7fd7fc9dded52643df 100644
>--- a/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGL.cpp
>+++ b/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGL.cpp
>@@ -25,7 +25,7 @@
> 
> #include "config.h"
> 
>-#if ENABLE(GRAPHICS_CONTEXT_3D)
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES)))
> 
> #include "Extensions3DOpenGL.h"
> 
>@@ -308,4 +308,4 @@ bool Extensions3DOpenGL::isVertexArrayObjectSupported()
> 
> } // namespace WebCore
> 
>-#endif // ENABLE(GRAPHICS_CONTEXT_3D)
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES)))
>diff --git a/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGLCommon.cpp b/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGLCommon.cpp
>index bf91e72457ade7077c4e081ec37d46c46406c920..b13ef58f7454b5ffe25f90366c1c44ef1d2975b6 100644
>--- a/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGLCommon.cpp
>+++ b/Source/WebCore/platform/graphics/opengl/Extensions3DOpenGLCommon.cpp
>@@ -26,7 +26,7 @@
> 
> #include "config.h"
> 
>-#if ENABLE(GRAPHICS_CONTEXT_3D)
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || USE(OPENGL_ES))
> #include "Extensions3DOpenGLCommon.h"
> 
> #include "ANGLEWebKitBridge.h"
>@@ -256,4 +256,4 @@ void Extensions3DOpenGLCommon::getnUniformivEXT(GC3Duint, int, GC3Dsizei, int *)
> 
> } // namespace WebCore
> 
>-#endif // ENABLE(GRAPHICS_CONTEXT_3D)
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || USE(OPENGL_ES))
>diff --git a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
>index 1dcf53b2f0cd008e82fc1631395a82400d6eb86a..e6848fceca41e9736f2a3817a9fd03cebae3ac11 100644
>--- a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
>+++ b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
>@@ -26,7 +26,7 @@
> 
> #include "config.h"
> 
>-#if ENABLE(GRAPHICS_CONTEXT_3D)
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES)))
> 
> #include "GraphicsContext3D.h"
> 
>@@ -503,4 +503,4 @@ void GraphicsContext3D::readPixels(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsi
> 
> }
> 
>-#endif // ENABLE(GRAPHICS_CONTEXT_3D)
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || (PLATFORM(COCOA) && USE(OPENGL_ES)))
>diff --git a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp
>index 7366dfca6ea26092fd79fd3b6536062b1d6c1daa..b24df035e288e1eb2f8af9f7ab91d779d0aca49e 100644
>--- a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp
>+++ b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLCommon.cpp
>@@ -28,7 +28,7 @@
> 
> #include "config.h"
> 
>-#if ENABLE(GRAPHICS_CONTEXT_3D)
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || USE(OPENGL_ES))
> 
> #include "GraphicsContext3D.h"
> #if PLATFORM(IOS_FAMILY)
>@@ -2079,4 +2079,4 @@ void GraphicsContext3D::primitiveRestartIndex(GC3Duint index)
> 
> }
> 
>-#endif // ENABLE(GRAPHICS_CONTEXT_3D)
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && (USE(OPENGL) || USE(OPENGL_ES))
>diff --git a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp
>index 0da2599b5ac371939598a76a08dab5c07750f093..ad5460b3b2c2c091b5070291a77ee596cb5b0125 100644
>--- a/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp
>+++ b/Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGLES.cpp
>@@ -28,7 +28,7 @@
> 
> #include "config.h"
> 
>-#if ENABLE(GRAPHICS_CONTEXT_3D) && !PLATFORM(IOS_FAMILY)
>+#if ENABLE(GRAPHICS_CONTEXT_3D) && USE(OPENGL_ES) && !PLATFORM(IOS_FAMILY)
> 
> #include "GraphicsContext3D.h"
> 
>@@ -400,4 +400,4 @@ PlatformLayer* GraphicsContext3D::platformLayer() const
> 
> }
> 
>-#endif // ENABLE(GRAPHICS_CONTEXT_3D) && !PLATFORM(IOS_FAMILY)
>+#endif // ENABLE(GRAPHICS_CONTEXT_3D) && USE(OPENGL_ES) && !PLATFORM(IOS_FAMILY)

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Attachments on bug 197755: 369534 | 369780 | 369786 | 369787 | 369793 | 371212 | 371576 | 371764 | 371784 | 371798 | 372093 | 372129 | 372309 | 372349