Attachment 347094 Details for Bug 187738 – WIP

[patch] WIP

bug-187738-20180814110058.patch (text/plain), 427.64 KB, created by Thomas Denney on 2018-08-14 11:01:01 PDT

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Creator: Thomas Denney

Created: 2018-08-14 11:01:01 PDT

Size: 427.64 KB

patch

obsolete

>Subversion Revision: 234853
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 30b733ae40036457ef84367906c047be00708795..b5eecf56d38567c383c6e220edfbf8e75be9470e 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,109 @@
>+2018-08-10  Thomas Denney  <tdenney@apple.com>
>+
>+        Adding WHLSL Compiler Tests
>+        https://bugs.webkit.org/show_bug.cgi?id=187738
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebGPUShadingLanguageRI/Intrinsics.js:
>+        (Intrinsics):
>+        * WebGPUShadingLanguageRI/Metal/.gitignore: Added.
>+        * WebGPUShadingLanguageRI/Metal/ArrayRefDefinition.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/CompileResult.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/ConstexprEmitter.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/Counter.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/Deinliner.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/FindTopLevelTypeAttributes.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/ForwardDeclarations.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/LineNumbers.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/MSLLexer.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/MSLTypeNamer.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/MetalCodegen.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/NameMangler.ts: Copied from Tools/WebGPUShadingLanguageRI/VisitingSet.js.
>+        * WebGPUShadingLanguageRI/Metal/README.md: Added.
>+        * WebGPUShadingLanguageRI/Metal/StructCodegen.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/StructFinalDefinition.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/StructForwardDeclaration.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/Token.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/TypeAttributes.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/TypeOfExpression.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/TypeSorter.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/TypeUnifier.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/VarOrFieldDeclaration.ts: Copied from Tools/WebGPUShadingLanguageRI/RecursionChecker.js.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/.gitignore: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/AppIcon.appiconset/Contents.json: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/Contents.json: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Base.lproj/Main.storyboard: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Default.whlsl: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Julia.whlsl: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Mandelbrot.whlsl: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Info.plist: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Metal equivalents/Shaders.metal: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.h: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/WHLSL.entitlements: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_Shared.whlsl: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/main.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL Tests.xcodeproj/project.pbxproj: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/WHLSL_ToyTests.m: Added.
>+        * WebGPUShadingLanguageRI/Metal/WHLSLLexer.ts: Added.
>+        * WebGPUShadingLanguageRI/Metal/index.html: Added.
>+        * WebGPUShadingLanguageRI/Metal/metal.css: Added.
>+        (textarea, .code-source):
>+        (input[type=button]):
>+        (.code-source):
>+        (td):
>+        (body):
>+        (h1, h2):
>+        (table):
>+        (.container-cell):
>+        (th, td):
>+        (.code-comment):
>+        (.code-comment-note):
>+        (.code-keyword, .code-type):
>+        (.code-literal):
>+        (.code-attribute):
>+        (.code-whitespace):
>+        (.code-error):
>+        (.code-directive):
>+        (.line-no):
>+        (.line-no::before):
>+        (.line):
>+        * WebGPUShadingLanguageRI/Metal/tsconfig.json: Added.
>+        * WebGPUShadingLanguageRI/RecursionChecker.js:
>+        (RecursionChecker.prototype.visitFuncDef):
>+        * WebGPUShadingLanguageRI/StandardLibrary.js:
>+        * WebGPUShadingLanguageRI/Test.js:
>+        * WebGPUShadingLanguageRI/VisitingSet.js:
>+        (VisitingSet.prototype.shouldVisit):
>+
> 2018-08-14  Aakash Jain  <aakash_jain@apple.com>
> 
>         [ews-build] Add support for max_builds parameter for workers
>diff --git a/Tools/WebGPUShadingLanguageRI/All.js b/Tools/WebGPUShadingLanguageRI/All.js
>index 15dd7ccab94692a32acd27b9dac96c8a8f55d658..4c63e0ec59ebc76aeaa3d6c910bce2237f471ff4 100644
>--- a/Tools/WebGPUShadingLanguageRI/All.js
>+++ b/Tools/WebGPUShadingLanguageRI/All.js
>@@ -34,6 +34,7 @@ load("Visitor.js");
> load("CreateLiteral.js");
> load("CreateLiteralType.js");
> load("PropertyAccessExpression.js");
>+load("SwizzleOp.js");
> 
> load("AddressSpace.js");
> load("AnonymousVariable.js");
>diff --git a/Tools/WebGPUShadingLanguageRI/Intrinsics.js b/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>index 933dfe011302b0fbc8344994a1a5c1f77c052a6f..d6e788debeaa14dd42bd72eb8dd110371f986e6b 100644
>--- a/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>+++ b/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>@@ -155,7 +155,27 @@ class Intrinsics {
>             func => {
>                 func.implementation = ([value]) => EPtr.box(value.loadValue() | 0);
>             });
>+
>+        this._map.set("native float log<>(float)", func => {
>+            func.implementation = ([value]) => EPtr.box(Math.log(value.loadValue()));
>+        });
>         
>+        this._map.set("native float pow<>(float,float)", func => {
>+            func.implementation = ([a, b]) => EPtr.box(Math.pow(a.loadValue(), b.loadValue()));
>+        });
>+
>+        this._map.set("native float sin<>(float)", func => {
>+            func.implementation = ([a]) => EPtr.box(Math.pow(a.loadValue()));
>+        });
>+
>+        this._map.set("native float cos<>(float)", func => {
>+            func.implementation = ([a]) => EPtr.box(Math.pow(a.loadValue()));
>+        });
>+
>+        this._map.set("native float atan2<>(float,float)", func => {
>+            func.implementation = ([a, b]) => EPtr.box(Math.atan2(a.loadValue(), b.loadValue()));
>+        });
>+
>         this._map.set(
>             "native operator<> int32(uint8)",
>             func => {
>@@ -541,7 +561,6 @@ class Intrinsics {
>                 },
>                 func.implementationData = swizzle;
>             });
>-            console.log(swizzle.toString());
>         }
>     }
>     
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/.gitignore b/Tools/WebGPUShadingLanguageRI/Metal/.gitignore
>new file mode 100644
>index 0000000000000000000000000000000000000000..35434ffb59d05621b1d662b7d989a497bf8dd9fa
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/.gitignore
>@@ -0,0 +1,2 @@
>+compiler.js
>+compiler.js.map
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/ArrayRefDefinition.ts b/Tools/WebGPUShadingLanguageRI/Metal/ArrayRefDefinition.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..e3a9f38c961116fbe8f852c564bf20277148811a
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/ArrayRefDefinition.ts
>@@ -0,0 +1,50 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Writes the definitions of the structures used for the different array ref types present in the program.
>+class ArrayRefDefinition {
>+    private _arrayRefType: ArrayRefType;
>+    private _typeNamer: MSLTypeNamer;
>+
>+    constructor(node, typeNamer)
>+    {
>+        this._arrayRefType = node;
>+        this._typeNamer = typeNamer;
>+    }
>+
>+    get arrayRefType()
>+    {
>+        return this._arrayRefType;
>+    }
>+
>+    toString()
>+    {
>+        let src = `struct ${this._typeNamer.uniqueTypeId(this.arrayRefType)} {\n`;
>+        src += `    ${this.arrayRefType.addressSpace} ${this._typeNamer.mslTypeName(this.arrayRefType.elementType)}* ptr;\n`;
>+        src += `    size_t length;\n`;
>+        src += `};`;
>+        return src;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/CompileResult.ts b/Tools/WebGPUShadingLanguageRI/Metal/CompileResult.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..aad082870c2dd0439f0626766c3b836a1b6cf2bf
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/CompileResult.ts
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class CompileResult {
>+
>+    private _metalShaderLanguageSource: string;
>+    private _error: Error;
>+    private _originalFunctionNameToMangledNames: any;
>+    private _functionSources: Map<string, string>;
>+
>+    constructor(src: string, err: Error, mangledNameMap: any, functionSources: Map<string, string>)
>+    {
>+        this._metalShaderLanguageSource = src;
>+        this._error = err;
>+        this._originalFunctionNameToMangledNames = mangledNameMap;
>+        this._functionSources = functionSources;
>+    }
>+
>+    get metalShaderLanguageSource(): string
>+    {
>+        return this._metalShaderLanguageSource;
>+    }
>+
>+    get error(): Error
>+    {
>+        return this._error;
>+    }
>+
>+    get originalFunctionNameToMangledNames()
>+    {
>+        return this._originalFunctionNameToMangledNames;
>+    }
>+
>+    get functionSources()
>+    {
>+        return this._functionSources;
>+    }
>+
>+    get didSucceed()
>+    {
>+        return this._error == null;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/ConstexprEmitter.ts b/Tools/WebGPUShadingLanguageRI/Metal/ConstexprEmitter.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..8ae12f389a09e7ab87ca18039984a7904e5ee664
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/ConstexprEmitter.ts
>@@ -0,0 +1,48 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Used in scenarios where having an auxiliary variable is not possible (e.g. switch cases).
>+class ConstexprEmitter extends Visitor
>+{
>+    visitBoolLiteral(node)
>+    {
>+        return node.value.toString();
>+    }
>+
>+    visitEnumLiteral(node)
>+    {
>+        return node.member.value.toString();
>+    }
>+
>+    visitGenericLiteral(node)
>+    {
>+        return node.value.toString();
>+    }
>+
>+    visitNullLiteral(node)
>+    {
>+        return "(nullptr)";
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/Counter.ts b/Tools/WebGPUShadingLanguageRI/Metal/Counter.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..9ef38cdf412082487991237b7d7ab1b916468e86
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/Counter.ts
>@@ -0,0 +1,41 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Provides unique names to variables, functions, and types.
>+class Counter {
>+    private _prefix: string;
>+    private _value: number;
>+
>+    constructor(prefix: string)
>+    {
>+        this._prefix = prefix;
>+        this._value = 0;
>+    }
>+
>+    fresh(): string
>+    {
>+        return `${this._prefix}${this._value++}`;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/Deinliner.ts b/Tools/WebGPUShadingLanguageRI/Metal/Deinliner.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..b6d261a70d6f9b9e95a1bb9a64b9916e4efe292d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/Deinliner.ts
>@@ -0,0 +1,392 @@
>+/*
>+ * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+// Determines whether a function has reducible control flow or potential early returns.
>+// This is a conservative estimate (e.g. in the case of loops).
>+function functionLikeBlockCanBeInlined(node: FunctionLikeBlock)
>+{
>+    enum ReturnStyle {
>+        Never,
>+        SometimesEarly,
>+        Always
>+    };
>+
>+    // A loop body might always return, but the loop body is only executed if the loop's condition holds.
>+    // We therefore downgrade our certainty for the whole loop.
>+    const beConservativeWithAlways = (a: ReturnStyle) => {
>+        return a == ReturnStyle.Always ? ReturnStyle.SometimesEarly : a;
>+    };
>+
>+    // Used wheere statement a immediately preceeds statement b.
>+    const combineReturnStylesForSubsequents = (a: ReturnStyle, b: ReturnStyle) => {
>+        if (a == ReturnStyle.Always || a == ReturnStyle.SometimesEarly)
>+            return a;
>+        return b;
>+    };
>+
>+    // Used when statement a is the if branch, statement b is the else branch
>+    const combineReturnStylesForAlternatives = (a: ReturnStyle, b: ReturnStyle) => {
>+        switch (a) {
>+        case ReturnStyle.Never:
>+            switch (b) {
>+            case ReturnStyle.Never:
>+                return ReturnStyle.Never;
>+            case ReturnStyle.Always:
>+                return ReturnStyle.SometimesEarly;
>+            case ReturnStyle.SometimesEarly:
>+                return ReturnStyle.SometimesEarly;
>+            }
>+        case ReturnStyle.SometimesEarly:
>+            return ReturnStyle.SometimesEarly;
>+        case ReturnStyle.Always:
>+            switch (b) {
>+            case ReturnStyle.Never:
>+            case ReturnStyle.SometimesEarly:
>+                return ReturnStyle.SometimesEarly;
>+            case ReturnStyle.Always:
>+                return ReturnStyle.Always;
>+            }
>+        }
>+    }
>+
>+    class ReturnStyleVisitor extends Visitor {
>+        private _visitList(list: Node[])
>+        {
>+            let style = ReturnStyle.Never;
>+            for (let statement of list) {
>+                style = combineReturnStylesForSubsequents(style, returnStyleForNodeOrNull(statement));
>+                if (style != ReturnStyle.Never)
>+                    return style;
>+            }
>+            return style;
>+        }
>+
>+        visitAnonymousVariable(node: AnonymousVariable)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitAssignment(node: Assignment)
>+        {
>+            return this._visitList([ node.lhs, node.rhs ]);
>+        }
>+
>+        visitBlock(node: Block)
>+        {
>+            return this._visitList(node.statements);
>+        }
>+
>+        visitBreak(node: Break)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitCallExpression(node: CallExpression)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitCommaExpression(node: CommaExpression)
>+        {
>+            return this._visitList(node.list);
>+        }
>+
>+        visitContinue(node: Continue)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitDereferenceExpression(node: DereferenceExpression)
>+        {
>+            return returnStyleForNodeOrNull(node.ptr);
>+        }
>+
>+        visitDotExpression(node: DotExpression)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitDoWhileLoop(node: DoWhileLoop)
>+        {
>+            return beConservativeWithAlways(this._visitList([ node.body, node.conditional ]));
>+        }
>+
>+        visitForLoop(node: ForLoop)
>+        {
>+            return beConservativeWithAlways(this._visitList([ node.initialization, node.condition, node.body, node.increment ]));
>+        }
>+
>+        visitFuncDef(node: FuncDef)
>+        {
>+            return returnStyleForNodeOrNull(node.body);
>+        }
>+
>+        visitFunctionLikeBlock(node: FunctionLikeBlock)
>+        {
>+            return returnStyleForNodeOrNull(node.func) == ReturnStyle.SometimesEarly ? ReturnStyle.SometimesEarly : ReturnStyle.Never;
>+        }
>+
>+        visitGenericLiteral(node: GenericLiteral)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitIdentityExpression(node: IdentityExpression)
>+        {
>+            return returnStyleForNodeOrNull(node.target);
>+        }
>+
>+        visitIfStatement(node: IfStatement)
>+        {
>+            const conditional = returnStyleForNodeOrNull(node.conditional);
>+            const body = returnStyleForNodeOrNull(node.body);
>+            const elseBody = returnStyleForNodeOrNull(node.elseBody);
>+            return combineReturnStylesForSubsequents(conditional, combineReturnStylesForAlternatives(body, elseBody));
>+        }
>+
>+        visitIndexExpression(node: IndexExpression)
>+        {
>+            return this._visitList([ node.array, node.index ]);
>+        }
>+
>+        visitLogicalExpression(node: LogicalExpression)
>+        {
>+            return this._visitList([ node.left, node.right ]);
>+        }
>+
>+        visitLogicalNot(node: LogicalNot)
>+        {
>+            return returnStyleForNodeOrNull(node.operand);
>+        }
>+
>+        visitMakeArrayRefExpression(node: MakeArrayRefExpression)
>+        {
>+            return returnStyleForNodeOrNull(node.lValue);
>+        }
>+
>+        visitMakePtrExpression(node: MakePtrExpression)
>+        {
>+            return returnStyleForNodeOrNull(node.lValue);
>+        }
>+
>+        visitNullLiteral(node: NullLiteral)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitReturn(node: Return)
>+        {
>+            return ReturnStyle.Always;
>+        }
>+
>+        visitSwitchCase(node: SwitchCase)
>+        {
>+            return returnStyleForNodeOrNull(node.body);
>+        }
>+
>+        visitSwitchStatement(node: SwitchStatement)
>+        {
>+
>+            // return within switch statements is awkward, so we prevent their inlining.
>+            // Its fine if the switch is a top level statement of the function and every branch returns,
>+            // including a default case, but if that switch is inside a loop or similar we start hitting issues.
>+            return beConservativeWithAlways(this._visitList(node.switchCases));
>+        }
>+
>+        visitTrapStatement(node: TrapStatement)
>+        {
>+            return ReturnStyle.Always;
>+        }
>+
>+        visitVariableDecl(node: VariableDecl)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitVariableRef(node: VariableRef)
>+        {
>+            return ReturnStyle.Never;
>+        }
>+
>+        visitWhileLoop(node: WhileLoop)
>+        {
>+            return beConservativeWithAlways(this._visitList([ node.conditional, node.body ]));
>+        }
>+
>+        visitArrayRefType(node: ArrayRefType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitArrayRefType");
>+        }
>+
>+        visitArrayType(node: ArrayType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitArrayType");
>+        }
>+
>+        visitBoolLiteral(node: BoolLiteral)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitBoolLiteral");
>+        }
>+
>+        visitConstexprTypeParameter(node: ConstexprTypeParameter)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitConstexprTypeParameter");
>+        }
>+
>+        visitConvertPtrToArrayRefExpression(node: ConvertPtrToArrayRefExpression)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitConvertPtrToArrayRefExpression");
>+        }
>+
>+        visitElementalType(node: ElementalType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitElementalType");
>+        }
>+
>+        visitEnumLiteral(node: EnumLiteral)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitEnumLiteral");
>+        }
>+
>+        visitEnumMember(node: EnumMember)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitEnumMember");
>+        }
>+
>+        visitEnumType(node: EnumType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitEnumType");
>+        }
>+
>+        visitField(node: Field)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitField");
>+        }
>+
>+        visitFunc(node: Func)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitFunc");
>+        }
>+
>+        visitFuncParameter(node: FuncParameter)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitFuncParameter");
>+        }
>+
>+        visitGenericLiteralType(node: GenericLiteralType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitGenericLiteralType");
>+        }
>+
>+        visitNativeFunc(node: NativeFunc)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitNativeFunc");
>+        }
>+
>+        visitNativeFuncInstance(node: NativeFuncInstance)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitNativeFuncInstance");
>+        }
>+
>+        visitNativeType(node: NativeType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitNativeType");
>+        }
>+
>+        visitNativeTypeInstance(node: NativeTypeInstance)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitNativeTypeInstance");
>+        }
>+
>+        visitNullType(node: NullType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitNullType");
>+        }
>+
>+        visitProgram(node: Program)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitProgram");
>+        }
>+
>+        visitProtocolDecl(node: ProtocolDecl)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitProtocolDecl");
>+        }
>+
>+        visitProtocolFuncDecl(node: ProtocolFuncDecl)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitProtocolFuncDecl");
>+        }
>+
>+        visitProtocolRef(node: ProtocolRef)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitProtocolRef");
>+        }
>+
>+        visitPtrType(node: PtrType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitPtrType");
>+        }
>+
>+        visitReadModifyWriteExpression(node: ReadModifyWriteExpression)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitReadModifyWriteExpression");
>+        }
>+
>+        visitReferenceType(node: ReferenceType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitReferenceType");
>+        }
>+
>+        visitStructType(node: StructType)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitStructType");
>+        }
>+
>+        visitTypeDef(node: TypeDef)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitTypeDef");
>+        }
>+
>+        visitTypeRef(node: TypeRef)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitTypeRef");
>+        }
>+
>+        visitTypeVariable(node: TypeVariable)
>+        {
>+            throw new Error("Unimplemented ReturnStyleVisitor.visitTypeVariable");
>+        }
>+    }
>+
>+    const returnStyleVisitor = new ReturnStyleVisitor();
>+
>+    function returnStyleForNodeOrNull(node: Node)
>+    {
>+        return node ? Node.visit(node, returnStyleVisitor) : ReturnStyle.Never;
>+    }
>+
>+    return returnStyleForNodeOrNull(node) != ReturnStyle.SometimesEarly;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/FindTopLevelTypeAttributes.ts b/Tools/WebGPUShadingLanguageRI/Metal/FindTopLevelTypeAttributes.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..cc72640576339accbb6daf5a1aebe82f98933f70
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/FindTopLevelTypeAttributes.ts
>@@ -0,0 +1,91 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Provides lookup for all the top level types in the program.
>+class FindTopLevelTypeAttributes extends Visitor {
>+    private _typeUnifier : TypeUnifier;
>+    private _typeAttributeMap : Map<string, TypeAttributes>;
>+
>+    constructor(functionDefs, typeUnifier)
>+    {
>+        super();
>+        this._typeUnifier = typeUnifier;
>+
>+        this._typeAttributeMap = new Map();
>+
>+        for (let func of functionDefs)
>+            Node.visit(func.func, this);
>+    }
>+
>+    _keyForType(type)
>+    {
>+        return this._typeUnifier.uniqueTypeId(type);
>+    }
>+
>+    hasAttributesForType(type)
>+    {
>+        return this._typeAttributeMap.has(this._keyForType(type));
>+    }
>+
>+    attributesForType(type)
>+    {
>+        const key = this._keyForType(type);
>+        let attrs = this._typeAttributeMap.get(key);
>+        if (!attrs) {
>+            attrs = new TypeAttributes(type);
>+            this._typeAttributeMap.set(key, attrs);
>+        }
>+        return attrs;
>+    }
>+
>+    visitFuncDef(func)
>+    {
>+        switch (func.shaderType) {
>+        case "vertex":
>+            this.visitVertexShader(func);
>+            break;
>+        case "fragment":
>+            this.visitFragmentShader(func);
>+            break;
>+        }
>+    }
>+
>+    private visitVertexShader(func)
>+    {
>+        this.attributesForType(func.returnType).isVertexOutputOrFragmentInput = true;
>+        for (let param of func.parameters)
>+            this.attributesForType(param.type).isVertexAttribute = true;
>+    }
>+
>+    private visitFragmentShader(func)
>+    {
>+        for (let param of func.parameters)
>+            this.attributesForType(param.type).isVertexOutputOrFragmentInput = true;
>+
>+        this.attributesForType(func.returnType).isFragmentOutput = true;
>+    }
>+
>+    // TODO: Handle compute shaders
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/ForwardDeclarations.ts b/Tools/WebGPUShadingLanguageRI/Metal/ForwardDeclarations.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..0d18099dd0fd688e9a8abd960be987d4dec70586
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/ForwardDeclarations.ts
>@@ -0,0 +1,352 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// To avoid having to convert all of the existing classes in the interpreter to
>+// TypeScript we instead just include all of the methods that we need here to
>+// avoid type errors with TypeScript.
>+
>+declare class Console {
>+    log(message: string, ...args: any[]);
>+}
>+
>+declare const console: Console;
>+
>+declare class Visitor {
>+    visitAnonymousVariable(node: AnonymousVariable);
>+    visitArrayRefType(node: ArrayRefType);
>+    visitArrayType(node: ArrayType);
>+    visitAssignment(node: Assignment);
>+    visitBlock(node: Block);
>+    visitBoolLiteral(node: BoolLiteral);
>+    visitBreak(node: Break);
>+    visitCallExpression(node: CallExpression);
>+    visitCommaExpression(node: CommaExpression);
>+    visitConstexprTypeParameter(node: ConstexprTypeParameter);
>+    visitContinue(node: Continue);
>+    visitConvertPtrToArrayRefExpression(node: ConvertPtrToArrayRefExpression);
>+    visitDereferenceExpression(node: DereferenceExpression);
>+    visitDotExpression(node: DotExpression);
>+    visitDoWhileLoop(node: DoWhileLoop);
>+    visitElementalType(node: ElementalType);
>+    visitEnumLiteral(node: EnumLiteral);
>+    visitEnumMember(node: EnumMember);
>+    visitEnumType(node: EnumType);
>+    visitField(node: Field);
>+    visitForLoop(node: ForLoop);
>+    visitFunc(node: Func);
>+    visitFuncDef(node: FuncDef);
>+    visitFuncParameter(node: FuncParameter);
>+    visitFunctionLikeBlock(node: FunctionLikeBlock);
>+    visitGenericLiteral(node: GenericLiteral);
>+    visitGenericLiteralType(node: GenericLiteralType);
>+    visitIdentityExpression(node: IdentityExpression);
>+    visitIfStatement(node: IfStatement);
>+    visitIndexExpression(node: IndexExpression);
>+    visitLogicalExpression(node: LogicalExpression);
>+    visitLogicalNot(node: LogicalNot);
>+    visitMakeArrayRefExpression(node: MakeArrayRefExpression);
>+    visitMakePtrExpression(node: MakePtrExpression);
>+    visitNativeFunc(node: NativeFunc);
>+    visitNativeFuncInstance(node: NativeFuncInstance);
>+    visitNativeType(node: NativeType);
>+    visitNativeTypeInstance(node: NativeTypeInstance);
>+    visitNullLiteral(node: NullLiteral);
>+    visitNullType(node: NullType);
>+    visitProgram(node: Program);
>+    visitProtocolDecl(node: ProtocolDecl);
>+    visitProtocolFuncDecl(node: ProtocolFuncDecl);
>+    visitProtocolRef(node: ProtocolRef);
>+    visitPtrType(node: PtrType);
>+    visitReadModifyWriteExpression(node: ReadModifyWriteExpression);
>+    visitReferenceType(node: ReferenceType);
>+    visitReturn(node: Return);
>+    visitStructType(node: StructType);
>+    visitSwitchCase(node: SwitchCase);
>+    visitSwitchStatement(node: SwitchStatement);
>+    visitTrapStatement(node: TrapStatement);
>+    visitTypeDef(node: TypeDef);
>+    visitTypeRef(node: TypeRef);
>+    visitTypeVariable(node: TypeVariable);
>+    visitVariableDecl(node: VariableDecl);
>+    visitVariableRef(node: VariableRef);
>+    visitWhileLoop(node: WhileLoop);
>+}
>+
>+declare class Rewriter {}
>+
>+declare class Lexer {
>+    constructor(a, b,  c, d);
>+    next(): any;
>+}
>+
>+declare class Assignment extends Node {
>+    lhs: Node;
>+    rhs: Node;
>+}
>+
>+declare class AnonymousVariable extends Node {}
>+
>+declare class ArrayRefType extends Type {
>+    constructor(origin, addressSpace, elementType);
>+
>+    addressSpace: string;
>+    elementType: Type;
>+}
>+
>+declare class ArrayType extends Type {
>+    constructor(origin, elementType, numElements);
>+
>+    elementType: Type;
>+    numElements: any;
>+}
>+
>+declare class Block extends Node {
>+    constructor(origin: any);
>+
>+    add(node: Node);
>+
>+    statements: Node[];
>+}
>+
>+declare class BoolLiteral extends Node {
>+    constructor(origin, value);
>+}
>+
>+declare class CallExpression extends Node {
>+    constructor(origin, name, typeArguments, argumentList);
>+
>+    actualTypeArguments: any;
>+    instantiatedActualTypeArguments: any;
>+    argumentTypes: any;
>+    func: any;
>+    nativeFuncInstance: any;
>+    possibleOverloads: any;
>+    resultType: any;
>+    resultEPtr: any;
>+
>+    setCastData(any);
>+}
>+
>+declare class CommaExpression extends Node {
>+    list: Node[];
>+}
>+
>+declare class DereferenceExpression extends Node {
>+    ptr: Node;
>+}
>+
>+declare class DoWhileLoop extends Node {
>+    constructor(origin, body, conditional);
>+
>+    body: Node;
>+    conditional: Node;
>+}
>+
>+declare class EnumType extends Type {
>+    constructor(origin, name, baseType);
>+}
>+
>+declare class Field extends Node {
>+    constructor(origin, name, type);
>+
>+    name: string;
>+    type: Type;
>+}
>+
>+declare class ForLoop extends Node {
>+    initialization: Node;
>+    condition: Node;
>+    increment: Node;
>+    body: Node;
>+}
>+
>+declare class Func extends Node {
>+    constructor(origin, name, returnType, typeParameters, parameters, isCast, shaderType);
>+
>+    name: string;
>+    origin: Origin;
>+    parameters: FuncParameter[];
>+    returnType: Type;
>+    shaderType: string;
>+    isEntryPoint: boolean;
>+}
>+
>+declare class FunctionLikeBlock extends Node {
>+    func: Func;
>+}
>+
>+declare class FuncDef extends Func {
>+    constructor(origin, name, returnType, typeParameters, parameters, body, isCast, shaderType);
>+
>+    body: Node;
>+}
>+
>+declare class FuncInstantiator {
>+    instances: any[];
>+}
>+
>+declare class FuncParameter extends Value {
>+    constructor(origin: Origin, name: string, type: Type);
>+
>+    origin: Origin;
>+    name: string;
>+    type: Type;
>+    varIsLValue: boolean;
>+}
>+
>+declare class IdentityExpression extends Node {
>+    target: Node;
>+}
>+
>+declare class IfStatement {
>+    constructor(origin, conditional, body, elseBody);
>+
>+    conditional: Node;
>+    body: Node;
>+    elseBody: Node;
>+}
>+
>+declare class IndexExpression extends Node {
>+    array: Node;
>+    index: Node;
>+}
>+
>+declare class LogicalExpression extends Node {
>+    text: string;
>+    left: Node;
>+    right: Node;
>+}
>+
>+declare class LogicalNot extends Node {
>+    operand: Node;
>+}
>+
>+declare class MakeArrayRefExpression extends Node {
>+    lValue: any;
>+    numElements: any;
>+}
>+
>+declare class MakePtrExpression extends Node {
>+    lValue: any;
>+}
>+
>+declare class NativeFuncInstance extends Node {
>+    constructor(func, returnType, parameters, isCast, shaderType, implementationData);
>+}
>+
>+declare class Node {
>+    static visit(func: any, visitor: Visitor | Rewriter);
>+    visit(visitor: Visitor);
>+
>+    origin: Origin;
>+}
>+
>+declare class Origin {
>+    index: number;
>+}
>+
>+declare class Program {
>+    topLevelStatements: Node[];
>+    functions: Func[];
>+    types: Type[];
>+    funcInstantiator: FuncInstantiator;
>+}
>+
>+declare class PtrType extends Type {
>+    constructor(origin, addressSpace, elementType);
>+}
>+
>+declare class StructType extends Type {
>+    constructor(origin, name, typeParameters);
>+
>+    fieldMap: Map<string, Field>;
>+    fields: Field[];
>+
>+    add(field: Field);
>+}
>+
>+declare class SwitchCase extends Node {
>+    isDefault: boolean;
>+    value: Node;
>+    body: Node;
>+}
>+
>+declare class SwitchStatement extends Node {
>+    switchCases: SwitchCase[];
>+}
>+
>+declare class SwizzleOp {
>+    constructor(outSize: number, components: string[], inSize: number);
>+
>+    outSize: number;
>+    components: string[];
>+    inSize: number;
>+}
>+
>+declare class Type extends Node {
>+    name: string;
>+    isArray: boolean;
>+}
>+
>+declare class VariableRef extends Node {}
>+
>+declare class Value extends Node {}
>+
>+declare class WhileLoop extends Node {
>+    constructor(origin, condition, body);
>+
>+    conditional: Node;
>+    body: Node;
>+}
>+
>+declare function prepare(file: string, lineOffset: number, src: string): Program;
>+
>+// TODO
>+declare class Break extends Node {}
>+declare class ConstexprTypeParameter extends Node {}
>+declare class Continue extends Node {}
>+declare class ConvertPtrToArrayRefExpression extends Node {}
>+declare class DotExpression extends Node {}
>+declare class ElementalType extends Node {}
>+declare class EnumLiteral extends Node {}
>+declare class EnumMember extends Node {}
>+declare class GenericLiteral extends Node {}
>+declare class GenericLiteralType extends Node {}
>+declare class NativeFunc extends Node {}
>+declare class NativeType extends Node {}
>+declare class NativeTypeInstance extends Node {}
>+declare class NullLiteral extends Node {}
>+declare class NullType extends Node {}
>+declare class ProtocolDecl extends Node {}
>+declare class ProtocolFuncDecl extends Node {}
>+declare class ProtocolRef extends Node {}
>+declare class ReadModifyWriteExpression extends Node {}
>+declare class ReferenceType extends Node {}
>+declare class Return extends Node {}
>+declare class TrapStatement extends Node {}
>+declare class TypeDef extends Node {}
>+declare class TypeRef extends Node {}
>+declare class TypeVariable extends Node {}
>+declare class VariableDecl extends Node {}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/LineNumbers.ts b/Tools/WebGPUShadingLanguageRI/Metal/LineNumbers.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..9c7c988439ef401c226839f1053c03e1f6779191
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/LineNumbers.ts
>@@ -0,0 +1,38 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// This must be called on the original WHLSL source before MSL compilation
>+// to allow translation from character indices to line numbers.
>+function lineNumbers(src: string): number[]
>+{
>+    const lineNumbers = [];
>+    let lineNumber = 1;
>+    for (let i = 0; i < src.length; i++) {
>+        lineNumbers.push(lineNumber);
>+        if (src[i] == '\n')
>+            lineNumber++;
>+    }
>+    return lineNumbers;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..6b57a400f636472c8a6497f3d76bc50104bc0dd1
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.ts
>@@ -0,0 +1,149 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Emits code for for the first line of a function declaration or definition.
>+class MSLFunctionDeclaration {
>+    private _funcMangler: NameMangler;
>+    private _func: FuncDef;
>+    private _typeArgs: Type[];
>+    private _typeNamer: MSLTypeNamer;
>+    private _mangledName: string;
>+    private _lineNumbers: number[];
>+    private _typeAttributes: FindTopLevelTypeAttributes;
>+
>+    constructor(funcMangler, funcDef, typeArguments, typeNamer, mangledName, lineNos, typeAttributes)
>+    {
>+        this._funcMangler = funcMangler;
>+        this._func = funcDef;
>+        this._typeArgs = typeArguments;
>+        this._typeNamer = typeNamer;
>+        this._mangledName = mangledName;
>+        this._lineNumbers = lineNos;
>+        this._typeAttributes = typeAttributes;
>+    }
>+
>+    get funcMangler(): NameMangler
>+    {
>+        return this._funcMangler;
>+    }
>+
>+    get func(): FuncDef
>+    {
>+        return this._func;
>+    }
>+
>+    get mangledName(): string
>+    {
>+        return this._mangledName;
>+    }
>+
>+    get typeNamer(): MSLTypeNamer
>+    {
>+        return this._typeNamer;
>+    }
>+
>+    get lineNumbers(): number[]
>+    {
>+        return this._lineNumbers;
>+    }
>+
>+    get typeAttributes(): FindTopLevelTypeAttributes
>+    {
>+        return this._typeAttributes;
>+    }
>+
>+    get isVertexShader()
>+    {
>+        return this._func.shaderType == "vertex";
>+    }
>+
>+    get paramMap()
>+    {
>+        const map = new Map();
>+        let counter = 0;
>+        for (let param of this._func.parameters)
>+            map.set(param.name, `P${counter++}`);
>+        return map;
>+    }
>+
>+    commentLine()
>+    {
>+        const params = [];
>+        for (let paramName of this.paramMap.keys())
>+            params.push(paramName);
>+        let line = `// ${this._func.name}(${params.join(", ")})`;
>+        if (this._lineNumbers && this._func.origin.index && this._lineNumbers[this._func.origin.index])
>+            line += ` @ line ${this._lineNumbers[this._func.origin.index]}`;
>+        return line + "\n";
>+    }
>+
>+    toString()
>+    {
>+        let declLine = this.commentLine();
>+
>+        // TODO: Support shader types other than fragment and vertex.
>+        // What WSL calls `compute` shaders Metal calls `kernel` shaders.
>+        // We're only focussing on `vertex` and `fragment` for now.
>+        if (this._func.shaderType === "vertex" || this._func.shaderType === "fragment")
>+            declLine += `${this._func.shaderType} `;
>+        declLine += `${this._typeNamer.mslTypeName(this._func.returnType)} `;
>+        declLine += this._mangledName;
>+        let typeArgIds = [];
>+        for (let arg of this._typeArgs)
>+            typeArgIds.push(this._typeNamer.uniqueTypeId(arg));
>+        if (typeArgIds.length)
>+            declLine += "_" + typeArgIds.join("_");
>+        declLine += "("
>+
>+        let params = [];
>+        const paramMap = this.paramMap;
>+        for (let param of this._func.parameters) {
>+            let pStr = `${this._typeNamer.mslTypeName(param.type)} ${paramMap.get(param.name)}`;
>+            // FIXME: The parser doesn't currently support vertex shaders having uint parameters, so this doesn't work.
>+            if (this.parameterIsVertexId(param) && this.isVertexShader)
>+                pStr += " [[vertex_id]]";
>+            else if (this.parameterIsAttribute(param))
>+                pStr += " [[stage_in]]";
>+            params.push(pStr);
>+        }
>+
>+        declLine += params.join(", ") + ")";
>+
>+        return declLine;
>+    }
>+
>+    parameterIsAttribute(node)
>+    {
>+        // We currently assuming that all parameters to entry points are attributes.
>+        // TODO: Better logic for this, i.e. support samplers.
>+        return this._func.isEntryPoint;
>+    }
>+
>+    parameterIsVertexId(node)
>+    {
>+        // FIXME: This isn't final, and isn't formally specified yet.
>+        return this.isVertexShader && node.name == "wsl_vertexID" && node.type.name == "uint32";
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..d77b5d8839e50ce60e980a5979c45ff8a392d0f0
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.ts
>@@ -0,0 +1,37 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class MSLFunctionDefinition extends MSLFunctionDeclaration
>+{
>+    toString()
>+    {
>+        let src = super.toString();
>+        src += "\n{\n";
>+        let emitter = new MSLStatementEmitter(this.funcMangler, this.typeNamer, this.func, this.paramMap, this.func.name, this.lineNumbers, this.typeAttributes);
>+        src += emitter.indentedSource();
>+        src += "}";
>+        return src;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..57c6f81353c1f381f967345f8987f3cfb91da518
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.ts
>@@ -0,0 +1,32 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class MSLFunctionForwardDeclaration extends MSLFunctionDeclaration
>+{
>+    toString()
>+    {
>+        return super.toString() + ";"
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLLexer.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLLexer.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..8f602669d76bf59a7988aff5360c7c610573167d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLLexer.ts
>@@ -0,0 +1,125 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Does sufficient lexing for the output of the compiler, not for MSL in general!
>+class MSLLexer {
>+    private _tokens: Token[];
>+
>+    constructor(src)
>+    {
>+        this._tokens = this._lex(src);
>+    }
>+
>+    get tokens(): Token[]
>+    {
>+        return this._tokens;
>+    }
>+
>+    private get commentMatchers()
>+    {
>+        return [
>+            { type: "comment", regex: /^(\/\/|\/\*)(\s+)?/ },
>+            { type: "comment-note", regex: /^(TODO:|FIXME:)/ },
>+            { type: "comment", regex: /.*(\n|$)/ }
>+        ]
>+    }
>+
>+    private get defaultMatchers()
>+    {
>+        return [
>+            { type: "comment", regex: /^\/\/(.*?)(\n|$)/, inner: this.commentMatchers },
>+            { type: "directive", regex: /^#(.*?)(\n|$)/ },
>+            { type: "whitespace", regex: /^\s+/ },
>+            { type: "literal", regex: /^([0-9]+)(\.([0-9]*?))?/ },
>+            { type: "type", regex: /^(char|uchar|struct|vertex|fragment|uint[0-9]?|int[0-9]?|float[0-9]?|void|bool|const|constant|thread|threadgroup|device|size_t)/ },
>+            { type: "keyword", regex: /^(return|if|else|do|while|switch|case|default|break|continue|nullptr|true|false|using|namespace)/ },
>+            { type: "attribute", regex: /^\[\[([A-z][A-z_0-9]+)\]\]/, inner: [
>+                { type: "attribute", regex: /^\[\[[A-z]+$/ },
>+                { type: "literal", regex: /^[0-9]+/ },
>+                { type: "attribute", regex: /^$\]\]/ },
>+                { type: "attribute", regex: /^\[\[([A-z][A-z_0-9]+)\]\]/ }
>+            ] },
>+            { type: "error", regex: /^undefined/ },
>+            { type: "identifier", regex: /^[A-z]([A-z0-9_]*)?/ },
>+            { type: "punctuation", regex: /^(;|\.|$|$|,|\+|\-|=|->|>|<|\!|\}|\{|\*|\?|\:|\[|\])/},
>+            { type: "unknown", regex: /^(.*?)(\n|$)/ }
>+        ];
>+    }
>+
>+    private _lex(src, initMatchers = null): Token[]
>+    {
>+        const tokens: Token[] = [];
>+        const matchers = initMatchers ? initMatchers : this.defaultMatchers;
>+
>+        const startOfMultilineComment = /^\/\*/;
>+        const endOfMultilineComment = /\*\//;
>+
>+        const originalLength = src.length;
>+
>+        while (src.length) {
>+            // Special case for multiline comments.
>+            const startMatch = startOfMultilineComment.exec(src);
>+            if (startMatch) {
>+                const endMatch = endOfMultilineComment.exec(src);
>+                if (endMatch) {
>+                    // Important to ignore the first two characters to avoid recursion.
>+                    tokens.push(new Token("comment", startMatch[0], originalLength - src.length));
>+                    const commentText = src.substring(2, endMatch.index + 2);
>+                    for (let innerTok of this._lex(commentText, this.commentMatchers))
>+                        tokens.push(innerTok);
>+                    src = src.substring(endMatch.index + 2);
>+                } else
>+                    throw new Error("Unmatched multiline comment");
>+            }
>+
>+            let didMatch = false;
>+            for (let matcher of matchers) {
>+                const match = matcher.regex.exec(src);
>+                if (match) {
>+                    if (matcher.inner) {
>+                        let innerToks = this._lex(match[0], matcher.inner);
>+                        for (let innerTok of innerToks) {
>+                            innerTok.startIndex += originalLength - src.length;
>+                            tokens.push(innerTok);
>+                        }
>+                    } else
>+                        tokens.push(new Token(matcher.type, match[0], originalLength - src.length));
>+                    src = src.substring(match[0].length);
>+                    didMatch = true;
>+                    break;
>+                }
>+            }
>+            if (!didMatch)
>+                throw new Error(`Nothing matched ${src}`);
>+        }
>+
>+        return tokens;
>+    }
>+}
>+
>+function lexMsl(msl: string): Token[]
>+{
>+    return new MSLLexer(msl).tokens;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..782d88b6fe6cbcb36de9fe52e468945aa512be08
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.ts
>@@ -0,0 +1,814 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class MSLStatementEmitter extends Visitor {
>+    private _funcMangler: NameMangler;
>+    private _typeNamer: MSLTypeNamer;
>+    private _func: Func;
>+    private _nameMap: Map<string, string>;
>+    private _nameMapStack: Array<Map<string, string>>;
>+    private _debugName: string;
>+    private _lineNumbers: number[];
>+    private _typeAttributes: FindTopLevelTypeAttributes;
>+    private _resultVar: string;
>+    private _counter : Counter;
>+    private _indentLevel: number;
>+    private _lines: string[];
>+    private _ancestorReturnType : Type;
>+    private _actualResult: string;
>+    private _loopConditionVariableStack: string[] = [];
>+    private _loopConditionNodeStack: Node[] = [];
>+    private _loopIncrementNodeStack: Node[] = [];
>+
>+    constructor(funcMangler: NameMangler, typeNamer: MSLTypeNamer, func: Func, paramMap: Map<string, string>, debugName: string, lineNos: number[], typeAttributes: FindTopLevelTypeAttributes, resultVar: string = null, counter: Counter = null, ancestorReturnType: Type = null)
>+    {
>+        super();
>+        this._funcMangler = funcMangler;
>+        this._typeNamer = typeNamer;
>+        this._func = func;
>+        this._nameMap = paramMap;
>+        this._nameMapStack = [];
>+        this._debugName = debugName;
>+        this._lineNumbers = lineNos;
>+        this._typeAttributes = typeAttributes;
>+        this._resultVar = resultVar;
>+        this._counter = counter ? counter : new Counter("V");
>+        this._indentLevel = 0;
>+        this._lines = [];
>+        this._ancestorReturnType = ancestorReturnType ? ancestorReturnType : func.returnType;
>+
>+        this._actualResult = Node.visit(this._func, this);
>+    }
>+
>+    get ancestorReturnType()
>+    {
>+        return this._ancestorReturnType;
>+    }
>+
>+    private _emitReturnZeroValue()
>+    {
>+        if (this.ancestorReturnType.name === "void")
>+            this._add(`return;`);
>+        else {
>+            const resultVar = this._fresh();
>+            this._add(`${this._typeNamer.mslTypeName(this.ancestorReturnType)} ${resultVar};`);
>+            this._zeroInitialize(this.ancestorReturnType, resultVar);
>+            this._add(`return ${resultVar};`);
>+        }
>+    }
>+
>+    // MSL uses the same default initialization rules as C++14, which means that the default value
>+    // of a local variable is not deterministic. Therefore we zero initialise everything, and hope
>+    // that LLVM is smart enough to avoid emitting anything if it doesn't need to.
>+    private _zeroInitialize(type, variableName, allowComment = true)
>+    {
>+        const emitter = this;
>+
>+        class ZeroInitializer extends Visitor {
>+            visitNativeType(node)
>+            {
>+                if (node.name == "bool")
>+                    emitter._add(`${variableName} = false;`);
>+                else
>+                    emitter._add(`${variableName} = 0;`);
>+            }
>+
>+            visitPtrType(node)
>+            {
>+                emitter._add(`${variableName} = nullptr;`);
>+            }
>+
>+            visitArrayType(node)
>+            {
>+                for (let i = 0; i < node.numElements.value; i++)
>+                    emitter._zeroInitialize(node.elementType, `${variableName}[${i}]`, false);
>+            }
>+
>+            visitArrayRefType(node)
>+            {
>+                emitter._add(`${variableName}.ptr = nullptr;`);
>+                emitter._add(`${variableName}.length = 0;`);
>+            }
>+
>+            visitEnumType(node)
>+            {
>+                emitter._zeroInitialize(node.baseType, variableName, false);
>+            }
>+
>+            visitStructType(node)
>+            {
>+                const typeAttributes = emitter._typeAttributes.attributesForType(node);
>+                const typeIsNative = emitter._typeNamer.typeUnifier._structIsNative(node);
>+
>+                for (let field of node.fields) {
>+                    let fieldName = field.name;
>+                    if (typeAttributes && !typeIsNative)
>+                        fieldName = typeAttributes.mangledFieldName(fieldName);
>+                    emitter._zeroInitialize(field.type, `${variableName}.${fieldName}`, false);
>+                }
>+            }
>+        }
>+        if (allowComment)
>+            this._add(`// Zero initialization of ${variableName}`);
>+        Node.visit(type, new ZeroInitializer());
>+    }
>+
>+    get actualResult()
>+    {
>+        return this._actualResult;
>+    }
>+
>+    get lines()
>+    {
>+        return this._lines;
>+    }
>+
>+    indentedSource()
>+    {
>+        return this._lines.map(line => "    " + line + "\n").join("");
>+    }
>+
>+    private get _loopConditionVariable(): string
>+    {
>+        return this._loopConditionVariableStack[this._loopConditionVariableStack.length - 1];
>+    }
>+
>+    private get _loopCondition(): Node
>+    {
>+        return this._loopConditionNodeStack[this._loopConditionNodeStack.length - 1];
>+    }
>+
>+    private get _loopIncrement(): Node
>+    {
>+        return this._loopIncrementNodeStack[this._loopIncrementNodeStack.length - 1];
>+    }
>+
>+    private _add(linesString)
>+    {
>+        for (let line of linesString.split('\n')) {
>+            for (let i = 0; i < this._indentLevel; i++)
>+                line = "    " + line;
>+            this._lines.push(line);
>+        }
>+    }
>+
>+    private _addLines(lines)
>+    {
>+        for (let line of lines)
>+            this._add(line);
>+    }
>+
>+    private _fresh()
>+    {
>+        return this._counter.fresh();
>+    }
>+
>+    private _indent()
>+    {
>+        this._indentLevel++;
>+    }
>+
>+    private _unindent()
>+    {
>+        this._indentLevel--;
>+    }
>+
>+    // Atomic statements.
>+
>+    visitBreak(node)
>+    {
>+        this._add("break;")
>+    }
>+
>+    visitContinue(node)
>+    {
>+        // This is necessary because for loops are compiled as while loops, so we need to do
>+        // the loop increment and condition check before returning to the beginning of the loop.
>+        this._emitLoopBodyEnd();
>+        this._add("continue;");
>+    }
>+
>+    // Basic compound statements.
>+
>+    visitBlock(block)
>+    {
>+        this._nameMapStack.push(this._nameMap);
>+        this._nameMap = new Map(this._nameMap);
>+        for (let stmt of block.statements) {
>+            if (stmt.origin && stmt.origin.index && this._lineNumbers && this._lineNumbers[stmt.origin.index])
>+                this._add(`// ${this._debugName} @ line ${this._lineNumbers[stmt.origin.index]}`);
>+            Node.visit(stmt, this);
>+        }
>+        this._nameMap = this._nameMapStack.pop();
>+    }
>+
>+    visitReturn(node)
>+    {
>+        let expr = node.value.visit(this);
>+        if (this._resultVar)
>+            this._add(`${this._resultVar} = ${expr};`);
>+        else
>+            this._add(`return ${expr};`);
>+    }
>+
>+    private _inScope(emitBraces = false, emitBlock: () => any)
>+    {
>+        if (emitBraces)
>+            this._add("{");
>+        this._indent();
>+
>+        this._nameMapStack.push(this._nameMap);
>+        this._nameMap = new Map(this._nameMap);
>+
>+        const res = emitBlock();
>+
>+        this._nameMap = this._nameMapStack.pop();
>+        if (emitBraces)
>+            this._add("}");
>+
>+        this._unindent();
>+
>+        return res;
>+    }
>+
>+    private _emitScoped(node: Node, emitBraces = false)
>+    {
>+        if (!node)
>+            throw new Error(`Can't emit scoped null node`);
>+
>+        return this._inScope(emitBraces, () => Node.visit(node, this));
>+    }
>+
>+    visitIfStatement(node)
>+    {
>+        let condition = node.conditional.visit(this);
>+        this._add(`if (${condition}) {`);
>+        this._emitScoped(node.body);
>+        // At the moment the parser emits Block nodes for the if and else bodies, so this allows us
>+        // to check whether or not the else body is actually empty, and therefore doesn't need to be emitted.
>+        // (This isn't necessary, it just yields shorter, easier to read output).
>+        const shouldEmitElseBody = node.elseBody && (!(node.elseBody instanceof Block) || node.elseBody.statements.length);
>+        if (shouldEmitElseBody) {
>+            this._add(`} else {`);
>+            this._emitScoped(node.elseBody);
>+            this._add('}');
>+        } else
>+            this._add('}');
>+    }
>+
>+    visitIdentityExpression(node)
>+    {
>+        return node.target.visit(this);
>+    }
>+
>+    visitLogicalNot(node)
>+    {
>+        const type = typeOf(node);
>+        if (type) {
>+            let expr = Node.visit(node.operand, this);
>+            let id = this._fresh();
>+            this._add(`${this._typeNamer.mslTypeName(type)} ${id} = !(${expr});`);
>+            return id;
>+        } else
>+            throw new Error(`Couldn't determine type of ! expression ${node}'`);
>+    }
>+
>+    visitDereferenceExpression(node)
>+    {
>+        /*
>+        An assignment such as someStruct.field = someValue is parsed as
>+        *((&someStruct)->value) = someValue
>+        which isn't ideal, because we can't take the address of a member like .x/.y/.z in a SIMD type.
>+        Therefore to avoid this pattern we determine if the expression we are dereferencing is
>+        just producing a reference, because then we can avoid both steps.
>+        */
>+        if (this._canAvoidDereferenceBecauseDereferencingReferenceNode(node.ptr))
>+            return this._doNotProduceReferenceFromReferenceNode(node.ptr);
>+        else {
>+            let result = node.ptr.visit(this);
>+            return `*(${result})`;
>+        }
>+    }
>+
>+    private _canAvoidDereferenceBecauseDereferencingReferenceNode(node)
>+    {
>+        const emitter = this;
>+
>+        class PossibleRefVisitor extends Visitor {
>+            visitMakePtrExpression(node) { return true; }
>+
>+            visitCallExpression(node)
>+            {
>+                return emitter._isOperatorAnder(node) || emitter._isOperatorIndexer(node);
>+            }
>+        }
>+
>+        // To avoid returning undefined/issues with functions not being defined.
>+        return Node.visit(node, new PossibleRefVisitor()) ? true : false;
>+    }
>+
>+    private _isOperatorAnder(node)
>+    {
>+        const anderRegex = /^operator\&\.(.*?)$/;
>+        return node.nativeFuncInstance && anderRegex.test(node.nativeFuncInstance.name);
>+    }
>+
>+    private _isOperatorGetter(node)
>+    {
>+        const getterRegex = /^operator.\.(.*?)$/;
>+        return node.nativeFuncInstance && getterRegex.test(node.nativeFuncInstance.name);
>+    }
>+
>+    private _isOperatorIndexer(node)
>+    {
>+        return node.nativeFuncInstance && node.nativeFuncInstance.name == "operator&[]";
>+    }
>+
>+    private _isOperatorSetter(node)
>+    {
>+        const setterRegex = /^operator\.(.*?)=$/;
>+        return node.nativeFuncInstance && setterRegex.test(node.nativeFuncInstance.name)
>+    }
>+
>+    private _isOperatorVectorAccessor(node)
>+    {
>+        const regex = /^operator\.[xyzw]+$/g;
>+        return node.func && node.func.implementationData instanceof SwizzleOp && regex.test(node.func.name);
>+    }
>+
>+    private _isOperatorCast(node: Func)
>+    {
>+        return node instanceof NativeFuncInstance && node.name == "operator cast";
>+    }
>+
>+    private _isUnaryOperator(node)
>+    {
>+        const operatorRegex = /^operator\~$/;
>+        console.log(node);
>+        return node.func && operatorRegex.test(node.name);
>+    }
>+
>+    private _isBinaryOperator(node)
>+    {
>+        const operatorRegex = /operator(\+|\-|\*|\/|\^|\&|\||\&\&|\|\||\<\<|\>\>|\<|\<\=|\>|\>\=|\=\=|\!\=)$/;
>+        return node.func && operatorRegex.test(node.name);
>+    }
>+
>+    private _extractOperatorName(node)
>+    {
>+        return node.name.substring("operator".length);
>+    }
>+
>+    private _doNotProduceReferenceFromReferenceNode(node)
>+    {
>+        const emitter = this;
>+
>+        class DefiniteRefVisitor extends Visitor {
>+
>+            visitMakePtrExpression(node)
>+            {
>+                return Node.visit(node.lValue, emitter);
>+            }
>+
>+            visitCallExpression(node)
>+            {
>+                const anderRegex = /^operator\&\.(.*?)$/;
>+                if (anderRegex.test(node.nativeFuncInstance.name))
>+                    return emitter._handleFieldAccess(node);
>+                else if (node.nativeFuncInstance.name === "operator&[]")
>+                    return emitter._handleIndexAccess(node);
>+            }
>+        }
>+
>+        return Node.visit(node, new DefiniteRefVisitor());
>+    }
>+
>+    visitVariableDecl(node)
>+    {
>+        let id = this._fresh();
>+        this._nameMap.set(node.name, id);
>+
>+        this._add(`${new VarOrFieldDeclaration(this._typeNamer, node.type, id)}; // ${node.name}`);
>+
>+        if (node.initializer) {
>+            let expr = node.initializer.visit(this);
>+            this._add(`${id} = ${expr};`);
>+        } else
>+            this._zeroInitialize(node.type, id);
>+    }
>+
>+    visitVariableRef(node)
>+    {
>+        if (node.variable instanceof AnonymousVariable)
>+            return Node.visit(node.variable, this);
>+        let name = node.name;
>+        if (!this._nameMap.has(name))
>+            throw new Error(`${node.name} not found in this function's variable map`);
>+        return this._nameMap.get(name);
>+    }
>+
>+    visitMakeArrayRefExpression(node)
>+    {
>+        const elemName = Node.visit(node.lValue, this);
>+        const type = this._typeNamer.mslTypeName(node.type);
>+        const id = this._fresh();
>+        this._add(`${type} ${id};`);
>+        this._add(`${id}.length = ${node.numElements.value};`);
>+        this._add(`${id}.ptr = ${elemName};`);
>+        return id;
>+    }
>+
>+    visitAnonymousVariable(node)
>+    {
>+        // Anonymous variable names are of the form anonVar<i> (where i is an integer), i.e.
>+        // the set of anonymous variable names is disjoint from the set of definable variable names.
>+        if (!this._nameMap.has(node.name)) {
>+            let id = this._fresh();
>+            this._nameMap.set(node.name, id);
>+            this._add(`${this._typeNamer.mslTypeName(node.type)} ${id}; // ${node.name}`);
>+            this._zeroInitialize(node.type, id);
>+            return id;
>+        } else
>+            return this._nameMap.get(node.name);
>+    }
>+
>+    visitAssignment(node)
>+    {
>+        const lhs = Node.visit(node.lhs, this);
>+        const rhs = Node.visit(node.rhs, this);
>+        this._add(`${lhs} = ${rhs};`);
>+        return rhs;
>+    }
>+
>+    visitCommaExpression(node: CommaExpression)
>+    {
>+        let result;
>+        for (let expr of node.list)
>+            result = Node.visit(expr, this);
>+        return result;
>+    }
>+
>+    visitCallExpression(node)
>+    {
>+        // Evaluate the arguments right-to-left.
>+        let argIds = [];
>+        for (let i = node.argumentList.length - 1; i >= 0; i--) {
>+            let id = node.argumentList[i].visit(this);
>+            argIds.unshift(id);
>+        }
>+        let result = this._fresh();
>+        if (node.func.returnType.name !== "void") {
>+            this._add(`// Result variable for call ${node.func.name}(${argIds.join(", ")})`);
>+            this._add(`${this._typeNamer.mslTypeName(node.resultType)} ${result};`);
>+        }
>+        this._makeFunctionCall(node.nativeFuncInstance, result, argIds);
>+
>+        return result;
>+    }
>+
>+    private _makeFunctionCall(node, result, args)
>+    {
>+        if (!node)
>+            throw new Error(`Can't compile call ${node} of non-native functions'`);
>+
>+        if (this._isOperatorVectorAccessor(node))
>+            this._add(`${result} = ${args[0]}.${node.func.implementationData.components.join("")};`);
>+        else if (this._isOperatorAnder(node)) {
>+            this._add(`// ${node.name}`);
>+            this._add(`${result} = &(${this._handleFieldAccess(node)});`);
>+        } else if (this._isOperatorSetter(node))
>+            this._add(`// TODO: (Native function) ${node.name}`);
>+        else if (this._isOperatorGetter(node))
>+            this._add(`// TODO: (Native function) ${node.name}`);
>+        else if (this._isOperatorIndexer(node))
>+            this._add(`// TODO: (Native function) ${node.name}`);
>+        else if (this._isOperatorCast(node)) {
>+            const retType = this._typeNamer.mslTypeName(node.returnType);
>+            this._add(`${result} = ${retType}(${args.join(", ")});`);
>+        } else if (this._isUnaryOperator(node)) {
>+            const op = this._extractOperatorName(node);
>+            this._add(`${result} = ${op}(${args[0]});`);
>+        } else if (this._isBinaryOperator(node)) {
>+            const op = this._extractOperatorName(node);
>+            this._add(`${result} = ${args[0]} ${op} ${args[1]};`);
>+        } else if (node.name == "log" || node.name == "pow" || node.name == "sin" || node.name == "cos" || node.name == "atan2")
>+            this._emitCallToMetalFunction(node.name, result, args); 
>+        else
>+            throw new Error(`Unimplemented native function '${node.name}' at MSLStatementEmitter.makeFunctionCall`);
>+
>+        return result;
>+    }
>+
>+    private _emitCallToMetalFunction(name, result, args)
>+    {
>+        this._add(`${result} = ${name}(${args.join(", ")});`);
>+    }
>+
>+    private _handleFieldAccess(node)
>+    {
>+        const arg = node.argumentList[0];
>+        let field = node.nativeFuncInstance.implementationData.fieldName;
>+        const type = node.nativeFuncInstance.implementationData.type;
>+        const typeAttributes = this._typeAttributes.attributesForType(type);
>+        const typeIsNative = this._typeNamer.typeUnifier._structIsNative(type);
>+        if (typeAttributes && !typeIsNative)
>+            field = typeAttributes.mangledFieldName(field);
>+
>+        if (arg instanceof MakePtrExpression) {
>+            const argId = Node.visit(arg.lValue, this);
>+            if (arg.lValue && arg.lValue instanceof VariableRef)
>+                return `${argId}.${field}`;
>+            else
>+                return `(${argId}).${field}`;
>+        } else
>+            return `${Node.visit(arg, this)}->${field}`;
>+    }
>+
>+    private _handleIndexAccess(node)
>+    {
>+        const array = node.argumentList[0];
>+        const index = node.argumentList[1];
>+
>+        if (array instanceof MakeArrayRefExpression) {
>+            if (index.isLiteral) {
>+                // Type checking will hopefully have already ensured this...
>+                if (index.value >= 0 && index.value < array.numElements.value) {
>+                    const variable = Node.visit(array.lValue, this);
>+                    return `${variable}[${index.value}]`;
>+                } else
>+                    throw new Error(`Index out of bounds in ${node}`);
>+            } else {
>+                // TODO: It would be interesting to see what kind of BCE could be done here.
>+                // Index checks aren't necessary for values < 0 because the type checker will
>+                // have already ensured that the index value type is an unsigned integer.
>+                const variable = Node.visit(array.lValue, this);
>+                const indexId = Node.visit(index, this);
>+                this._add(`if (${indexId} >= ${array.numElements.value}) {`);
>+                this._indent();
>+                this._emitReturnZeroValue();
>+                this._unindent();
>+                this._add(`}`);
>+                return `${variable}[${indexId}]`;
>+            }
>+        } else
>+            this._add(`// TODO: Handle ${array} in MSLStatementEmitter._handleIndexAccess`);
>+    }
>+
>+    visitMakePtrExpression(node)
>+    {
>+        const expr = node.lValue.visit(this);
>+        return `&(${expr})`;
>+    }
>+
>+    visitFunctionLikeBlock(node)
>+    {
>+        const canBeInlined = functionLikeBlockCanBeInlined(node);
>+        if (canBeInlined)
>+            this._add(`// inline ${node.origin.text}`);
>+        else
>+            this._add(`// call to ${node.origin.text}`);
>+
>+        // 1. Create result variable if necessary.
>+        let resultVar = null;
>+        if (node.returnType.name != "void") {
>+            resultVar = this._fresh();
>+            this._add(`${this._typeNamer.mslTypeName(node.returnType)} ${resultVar};`);
>+        }
>+
>+        this._add("{");
>+        this._indent();
>+
>+        // 2. Evaluate the arguments.
>+        const args = [];
>+        for (let i = node.argumentList.length - 1; i >= 0; i--) {
>+            let id = node.argumentList[i].visit(this);
>+            args.unshift(id);
>+        }
>+
>+        // 3. Emit the call inline or as a real call.
>+        if (canBeInlined)
>+            this._callFunctionLikeBlockInline(node, resultVar, args);
>+        else
>+            this._callFunctionLikeBlockWithCall(node, resultVar, args);
>+
>+        this._unindent();
>+        this._add("}");
>+
>+        return resultVar;
>+    }
>+
>+    private _callFunctionLikeBlockInline(node, resultVar, args)
>+    {
>+        const nameMap = new Map(this._nameMap);
>+        const params = node.parameters;
>+        for (let i = 0; i < params.length; i++)
>+            nameMap.set(params[i].name, args[i]);
>+
>+        const emitter = new MSLStatementEmitter(this._funcMangler, this._typeNamer, node.body, nameMap, node.origin.text, this._lineNumbers, this._typeAttributes, resultVar, this._counter, this.ancestorReturnType);
>+        this._addLines(emitter.lines);
>+    }
>+
>+    private _callFunctionLikeBlockWithCall(node, resultVar, args)
>+    {
>+        const mangledCallName = this._funcMangler.mangle(node.func);
>+        this._add(`${resultVar} = ${mangledCallName}(${args.join(", ")});`);
>+    }
>+
>+    // Loop code generation. Loops all follow the same style where they declare a conditional variable (boolean)
>+    // which is checked on each iteration (all loops are compiled to a while loop or do/while loop). The check is
>+    // emitted in _emitLoopCondition. For loops additionally have _emitLoopBodyEnd for the increment on each iteration.
>+
>+    visitForLoop(node: ForLoop)
>+    {
>+        this._emitAsLoop(node.condition, node.increment, (conditionVar) => {
>+            Node.visit(node.initialization, this);
>+            this._emitLoopCondition();
>+            this._add(`while (${conditionVar}) {`);
>+            this._emitScoped(node.body);
>+            this._emitLoopBodyEnd();
>+            this._add('}');
>+        });
>+    }
>+
>+    visitWhileLoop(node)
>+    {
>+        this._emitAsLoop(node.conditional, null, (conditionVar) => {
>+            this._add(`while (${conditionVar}) {`);
>+            this._emitScoped(node.body);
>+            this._emitLoopCondition();
>+            this._add('}');
>+        });
>+    }
>+
>+    visitDoWhileLoop(node)
>+    {
>+        this._emitAsLoop(node.conditional, null, (conditionVar: string) => {
>+            this._add("do {");
>+            this._emitScoped(node.body);
>+            this._emitLoopBodyEnd();
>+            this._add(`} while (${conditionVar});`);
>+        });
>+    }
>+
>+    private _emitAsLoop(conditional: Node, increment: Node, emitLoopBody: (conditionalVar: string) => void)
>+    {
>+        const conditionVar = this._fresh();
>+        this._loopConditionVariableStack.push(conditionVar);
>+        this._loopConditionNodeStack.push(conditional);
>+        this._loopIncrementNodeStack.push(increment);
>+        this._add(`bool ${conditionVar} = true;`);
>+
>+        emitLoopBody(conditionVar);
>+
>+        this._loopIncrementNodeStack.pop();
>+        this._loopConditionVariableStack.pop();
>+        this._loopConditionNodeStack.pop();
>+    }
>+
>+    private _emitLoopBodyEnd()
>+    {
>+        this._emitLoopIncrement();
>+        this._emitLoopCondition();
>+    }
>+
>+    private _emitLoopIncrement()
>+    {
>+        if (this._loopIncrement)
>+            this._emitScoped(this._loopIncrement);
>+    }
>+
>+    private _emitLoopCondition()
>+    {
>+        if (this._loopCondition) {
>+            const conditionResult: Node = this._emitScoped(this._loopCondition);
>+            this._add(`${this._loopConditionVariable} = ${conditionResult};`);
>+        }
>+    }
>+
>+    // Switch statements.
>+
>+    visitSwitchStatement(node)
>+    {
>+        const caseValueEmitter = new ConstexprEmitter();
>+
>+        let switchValue = Node.visit(node.value, this);
>+        this._add(`switch (${switchValue}) {`);
>+        this._indent();
>+
>+        for (let i = 0; i < node.switchCases.length; i++) {
>+            let switchCase = node.switchCases[i];
>+            if (!switchCase.isDefault)
>+                this._add(`case ${Node.visit(switchCase.value, caseValueEmitter)}: {`);
>+            else
>+                this._add("default: {");
>+            this._emitScoped(switchCase.body);
>+            this._add("}");
>+        }
>+
>+        this._unindent();
>+        this._add("}");
>+    }
>+
>+    visitSwitchCase(node)
>+    {
>+        throw new Error(`// FIXME: Hit |visitSwitchCase|, should be handled by |visitSwitchStatement|`);
>+    }
>+
>+    // Literals
>+
>+    visitBoolLiteral(node)
>+    {
>+        const fresh = this._fresh();
>+        this._add(`bool ${fresh} = ${node.value};`);
>+        return fresh;
>+    }
>+
>+    visitEnumLiteral(node)
>+    {
>+        const fresh = this._fresh();
>+        this._add(`${this._typeNamer.mslTypeName(node.type.baseType)} ${fresh} = ${node.member.value};`);
>+        return fresh;
>+    }
>+
>+    visitGenericLiteral(node)
>+    {
>+        const fresh = this._fresh();
>+        this._add(`${this._typeNamer.mslTypeName(node.type)} ${fresh} = ${node.value};`);
>+        return fresh;
>+    }
>+
>+    visitNullLiteral(node)
>+    {
>+        return `(nullptr)`;
>+    }
>+
>+    visitDotExpression(node)
>+    {
>+        throw new Error(`Dot expressions ${node} should have been converted to an operator`);
>+    }
>+
>+    visitTrapStatement(node)
>+    {
>+        this._emitReturnZeroValue();
>+    }
>+
>+    // Unimplemented methods. I write out comments for these rather than throwing exceptions because it makes it easier for me
>+    // to see where the nodes occur in the abstract syntax tree
>+
>+    visitConvertPtrToArrayRefExpression(node)
>+    {
>+        this._add("// TODO: visitConvertPtrToArrayRefExpression");
>+    }
>+
>+    visitIndexExpression(node)
>+    {
>+        this._add("// TODO: visitIndexExpression");
>+    }
>+
>+    visitLogicalExpression(node)
>+    {
>+        this._add("// TODO: visitLogicalExpression");
>+    }
>+
>+    visitNativeFunc(node)
>+    {
>+        this._add("// TODO: visitNativeFunc");
>+    }
>+
>+    visitNativeFuncInstance(node)
>+    {
>+        this._add("// TODO: visitNativeFuncInstance");
>+    }
>+
>+    visitNativeTypeInstance(node)
>+    {
>+        this._add("// TODO: visitNativeTypeInstance");
>+    }
>+
>+    visitReadModifyWriteExpression(node)
>+    {
>+        this._add("// TODO: visitReadModifyWriteExpression");
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.ts b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..65996f954e6867cda121b844b40d1d1e25ddae8c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.ts
>@@ -0,0 +1,114 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class MSLTypeNamer {
>+    private _typeUnifier: TypeUnifier;
>+
>+    constructor(typeUnifier)
>+    {
>+        this._typeUnifier = typeUnifier;
>+    }
>+
>+    get typeUnifier() 
>+    {
>+        return this._typeUnifier; 
>+    }
>+    
>+    uniqueTypeId(type) 
>+    { 
>+        return this.typeUnifier.uniqueTypeId(type); 
>+    }
>+    
>+    // Yields the string that should be used in MSL source for the type.
>+    mslTypeName(type)
>+    {
>+        let name = "";
>+
>+        const unifiedType = this.typeUnifier.unifyTypes(type);
>+        const typeUnifier = this.typeUnifier;
>+        const typeNamer = this;
>+
>+        class TypeNameVisitor extends Visitor
>+        {
>+            visitNativeType(node)
>+            {
>+                const nativeTypeNameMap = {
>+                    "void": "void",
>+                    "uint8": "uchar",
>+                    "int32": "int",
>+                    "uint32": "uint",
>+                    "bool": "bool",
>+                    "float32": "float",
>+                    // Metal does not natively support double.
>+                    // It is possibly to use it with -fnative-double as a Metal compiler flag.
>+                    // FIXME: Review whether we can set the flag in runtime compilation.
>+                    "float64": "double"
>+                };
>+
>+                name = nativeTypeNameMap[node.name];
>+            }
>+
>+            visitStructType(node)
>+            {
>+                if (typeUnifier._structIsNative(node)) {
>+                    let suffix = "";
>+                    if (node.name == "vec2")
>+                        suffix = "2";
>+                    else if (node.name == "vec3")
>+                        suffix = "3";
>+                    else if (node.name == "vec4")
>+                        suffix = "4";
>+
>+                    name = typeNamer.mslTypeName(node.fields.next().value.type) + suffix;
>+                } else
>+                    name = typeUnifier.uniqueTypeId(node);
>+            }
>+
>+            visitEnumType(node) 
>+            { 
>+                return Node.visit(node.baseType, this); 
>+            }
>+
>+            visitReferenceType(node)
>+            {
>+                name = `${node.addressSpace} ${typeNamer.mslTypeName(node.elementType)}*`;
>+            }
>+
>+            visitArrayType(node)
>+            {
>+                name = `${typeNamer.mslTypeName(node.elementType)}*`;
>+            }
>+
>+            visitArrayRefType(node)
>+            {
>+                name = typeUnifier.uniqueTypeId(node);
>+            }
>+        }
>+
>+        unifiedType.visit(new TypeNameVisitor());
>+
>+        return name;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MetalCodegen.ts b/Tools/WebGPUShadingLanguageRI/Metal/MetalCodegen.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..3a489be2e50ec9ee40b6adb5c680770a1590871c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MetalCodegen.ts
>@@ -0,0 +1,293 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+const DefaultMetalSource = `#include <metal_stdlib>
>+using namespace metal;
>+
>+`;
>+
>+// Handles the compilation of Program AST instances to CompileResult instances, which
>+// include the raw MSL. In general clients should call |whlslToMsl|, which parses,
>+// typechecks, and inlines the WHLSL before passing it to this compiler.
>+class MetalCodegen {
>+    private _program: Program;
>+    private _lineNumbers: number[];
>+    private _declarations: any[];
>+    private _allowComments: boolean;
>+    private _includeFunctionForwardDeclarations: boolean;
>+    private _includeTypeReference: boolean;
>+    private _typeUnifier: TypeUnifier;
>+    private _typeNamer: MSLTypeNamer;
>+    private _forwardTypeDecls: any[];
>+    private _typeDefinitions: any[];
>+    private _forwardFunctionDecls: any[];
>+    private _functionDefintions: MSLFunctionDefinition[];
>+    private _allTypeAttributes: FindTopLevelTypeAttributes;
>+    private _funcNameMangler: NameMangler;
>+    private _functionSources: Map<string, string>;
>+
>+    constructor(program: Program, lineNos: number[] = null)
>+    {
>+        this._program = program;
>+        this._lineNumbers = lineNos;
>+
>+        this._declarations = [];
>+
>+        this._allowComments = true;
>+        this._includeFunctionForwardDeclarations = true;
>+        this._includeTypeReference = true;
>+    }
>+
>+    get program()
>+    {
>+        return this._program;
>+    }
>+
>+    get declarations()
>+    {
>+        return this._declarations;
>+    }
>+
>+    get allowComments()
>+    {
>+        return this._allowComments;
>+    }
>+
>+    set allowComments(newAllowComments)
>+    {
>+        this._allowComments = newAllowComments;
>+    }
>+
>+    get includeTypeReference()
>+    {
>+        return this._includeTypeReference;
>+    }
>+
>+    set includeTypeReference(newValue)
>+    {
>+        this._includeTypeReference = newValue;
>+    }
>+
>+    get functionSources(): Map<string, string>
>+    {
>+        return this._functionSources;
>+    }
>+
>+    // The main entry point for the compiler, however clients should generally call whlslToMsl,
>+    // which is defined at the bottom of this file.
>+    generateMsl(): CompileResult
>+    {
>+        try {
>+            const src = this._tryGenerateMsl();
>+            const mangledMap = {};
>+            for (let func of this._functionDefintions) {
>+                const key = func.func.name;
>+                const value = func.mangledName;
>+                if (!(key in mangledMap))
>+                    mangledMap[key] = [];
>+                mangledMap[key].push(value);
>+            }
>+
>+            return new CompileResult(src, null, mangledMap, this._functionSources);
>+        } catch (e) {
>+            return new CompileResult(null, e, null, null);
>+        }
>+    }
>+
>+    private _tryGenerateMsl(): string
>+    {
>+        this._typeUnifier = new TypeUnifier();
>+        this._typeNamer = new MSLTypeNamer(this._typeUnifier);
>+        this._forwardTypeDecls = [];
>+        this._typeDefinitions = [];
>+        this._forwardFunctionDecls = [];
>+        this._functionDefintions = [];
>+
>+        // Step 1: Find all the functions that actually need to be compiled
>+        // (including functions that need to be de-inlined). We additionally perform
>+        // type unification.
>+
>+        const entryFuncDefs = this._findEntryPointDefinitions();
>+        const unifiedEntryFunctionDefs = this._unifyFunctionTypes(entryFuncDefs);
>+        const unifiedFunctionDefs = this._findFunctionDefinitionsToCompile(unifiedEntryFunctionDefs);
>+
>+        // Step 2: Find properties of the types and create type and function declarations.
>+
>+        this._allTypeAttributes = new FindTopLevelTypeAttributes(unifiedFunctionDefs, this._typeUnifier);
>+        this._createTypeDecls();
>+        this._createFunctionDecls(unifiedFunctionDefs);
>+
>+        // Step 3: Generate the actual MSL source code.
>+
>+        let outputStr = DefaultMetalSource;
>+
>+        const addSection = (title, decls) => {
>+            outputStr += `#pragma mark - ${title}\n\n${decls.join("\n\n")}\n\n`;
>+        };
>+
>+        addSection("Forward type declarations", this._forwardTypeDecls);
>+        addSection("Type definitions", this._typeDefinitions);
>+        if (this._includeFunctionForwardDeclarations)
>+            addSection("Forward function declarations", this._forwardFunctionDecls);
>+        addSection("Function definitions", this._functionDefintions);
>+
>+        // Step 4: Post-generation source tidy up (type reference comments and comment removal).
>+
>+        if (this.includeTypeReference) {
>+            outputStr += "#pragma mark - Type reference\n";
>+            for (let type of this._typeUnifier.allTypes) {
>+                const typeId = this._typeUnifier.uniqueTypeId(type);
>+                const typeName = this._typeUnifier.uniqueName(type);
>+                outputStr += `\n// ${typeId} <- ${typeName}`;
>+            }
>+        }
>+
>+        if (!this.allowComments)
>+            outputStr = this._removeCommentsAndEmptyLines(outputStr);
>+
>+        // Step 5: Create a map of the mangled function names to their source
>+        // (used for the copy buttons).
>+        this._functionSources = new Map();
>+        for (let func of this._functionDefintions)
>+            this._functionSources.set(func.mangledName, func.toString());
>+
>+        return outputStr;
>+    }
>+
>+    private _findEntryPointDefinitions()
>+    {
>+        const functions = [];
>+        for (let instances of this._program.funcInstantiator.instances.values()) {
>+            for (let instance of instances) {
>+                if (instance.func.isEntryPoint)
>+                    functions.push(instance);
>+            }
>+        }
>+        return functions;
>+    }
>+
>+    private _unifyFunctionTypes(functionDefinitions)
>+    {
>+        this._funcNameMangler = new NameMangler('F');
>+        return functionDefinitions.map((f, i) => {
>+            const unifiedFunc = this._typeUnifier.unifyTypes(f.func);
>+            return {
>+                func: unifiedFunc,
>+                typeArguments: f.typeArguments.map(arg => this._typeUnifier.unifyTypes(arg)),
>+                mangledName: this._funcNameMangler.mangle(unifiedFunc)
>+            }
>+        });
>+    }
>+
>+    // Finds FunctionLikeBlocks that can't be inlined because they don't have reducible control flow, so promotes them
>+    // to full function definitions.
>+    private _findFunctionDefinitionsToCompile(functionDefinitions)
>+    {
>+        const functionSet = new Set<Node>();
>+        const funcNameMangler = this._funcNameMangler;
>+
>+        class FindFunctionsToDeclare extends Visitor {
>+            visitFunctionLikeBlock(node: FunctionLikeBlock)
>+            {
>+                if (!functionSet.has(node.func)) {
>+                    if (!functionLikeBlockCanBeInlined(node)) {
>+                        functionSet.add(node.func);
>+                        functionDefinitions.push({
>+                            func: node.func,
>+                            typeArguments: [],
>+                            mangledName: funcNameMangler.mangle(node.func)
>+                         });
>+                    }
>+                    super.visitFunctionLikeBlock(node);
>+                }
>+            }
>+        }
>+
>+        const visitor = new FindFunctionsToDeclare();
>+
>+        for (let funcDef of functionDefinitions)
>+            Node.visit(funcDef.func, visitor);
>+
>+        return functionDefinitions;
>+    }
>+
>+    private _createTypeDecls()
>+    {
>+        const typesThatNeedDeclaration = this._typeUnifier.typesThatNeedDeclaration();
>+        const typeDeclsInOrder = this._sortTypeDeclarationsInTopologicalOrder(typesThatNeedDeclaration);
>+
>+        for (let type of typeDeclsInOrder) {
>+            const metalStructCodeGen = new StructCodegen(type, this._typeNamer, this._lineNumbers, this._allTypeAttributes.attributesForType(type));
>+            this._forwardTypeDecls.push(metalStructCodeGen.forwardDeclaration);
>+            this._typeDefinitions.push(metalStructCodeGen.finalDefinition);
>+        }
>+    }
>+
>+    private _createFunctionDecls(unifiedFunctionDefs)
>+    {
>+        for (let func of unifiedFunctionDefs) {
>+            this._forwardFunctionDecls.push(new MSLFunctionForwardDeclaration(this._funcNameMangler, func.func, func.typeArguments, this._typeNamer, func.mangledName, this._lineNumbers, this._allTypeAttributes));
>+            this._functionDefintions.push(new MSLFunctionDefinition(this._funcNameMangler, func.func, func.typeArguments, this._typeNamer, func.mangledName, this._lineNumbers, this._allTypeAttributes));
>+        }
>+    }
>+
>+    private _sortTypeDeclarationsInTopologicalOrder(typesToDeclare)
>+    {
>+        const declarations = new Array();
>+        for (let type of typesToDeclare)
>+            declarations.push(type);
>+        const typeOrder = new TypeSorter(this._typeUnifier, typesToDeclare).topologicalOrder;
>+        const typeOrderMap = new Map<Type, number>();
>+        for (let i = 0; i < typeOrder.length; i++)
>+            typeOrderMap.set(typeOrder[i], i);
>+        return declarations.sort((a, b) => typeOrderMap.get(this._typeUnifier.uniqueTypeId(a)) - typeOrderMap.get(this._typeUnifier.uniqueTypeId(b)));
>+    }
>+
>+    // Also removes #pragma marks.
>+    private _removeCommentsAndEmptyLines(src)
>+    {
>+        const singleLineCommentRegex = /(\/\/|\#pragma)(.*?)($|\n)/;
>+        const lines = src.split('\n')
>+            .map(line => line.replace(singleLineCommentRegex, '').trimEnd())
>+            .filter(line => line.length > 0);
>+        return lines.join('\n');
>+    }
>+}
>+
>+// Main wrapper for the compiler. Clients should use this function to compile WHLSL.
>+function whlslToMsl(src: string): CompileResult {
>+    let parsedProgram;
>+    try {
>+        parsedProgram = prepare("/internal/test", 0, src);
>+    } catch (e) {
>+        return new CompileResult(null, e, null, null);
>+    }
>+
>+    if (!(parsedProgram instanceof Program))
>+        return new CompileResult(null, new Error("Compilation failed"), null, null);
>+
>+    const compiler = new MetalCodegen(parsedProgram, lineNumbers(src));
>+    return compiler.generateMsl();
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/NameMangler.ts b/Tools/WebGPUShadingLanguageRI/Metal/NameMangler.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..6f017197d7aea8fcf47503cb4a5b4daa9ca8def0
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/NameMangler.ts
>@@ -0,0 +1,45 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class NameMangler {
>+    private _prefix: string;
>+    private _counter: number;
>+    private _mangledNameMap: Map<any, string>;
>+
>+    constructor(prefix: string)
>+    {
>+        this._prefix = prefix;
>+        this._counter = 0;
>+        this._mangledNameMap = new Map();
>+    }
>+
>+    mangle(key: any): string
>+    {
>+        if (!this._mangledNameMap.has(key)) {
>+            this._mangledNameMap.set(key, `${this._prefix}${this._counter++}`);
>+        }
>+        return this._mangledNameMap.get(key);
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/README.md b/Tools/WebGPUShadingLanguageRI/Metal/README.md
>new file mode 100644
>index 0000000000000000000000000000000000000000..97cd86451de65695ad5b3b56338a81b721145093
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/README.md
>@@ -0,0 +1,16 @@
>+# Metal Shader Language code generation
>+
>+## Building
>+
>+The MSL compiler is based around the existing WSL interpreter in the parent directory. The compiler is written in TypeScript, a typed superset of JavaScript. To compile and run the compiler:
>+
>+1. Install [Node.js][Node] LTS
>+2. Install [TypeScript][typescript] by running `npm install -g typescript`
>+3. Either:
>+    (a) Open Visual Studio Code, press CMD + SHIFT + B, click `build` or `watch`
>+    (b) Run `tsc -p tsconfig.js` inside this directory
>+4. Start a web browser in the parent directory
>+5. Go to [http://localhost:8000/Metal][] to run the compiler
>+
>+[Node]: https://nodejs.org
>+[typescript]: https://www.typescriptlang.org
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/StructCodegen.ts b/Tools/WebGPUShadingLanguageRI/Metal/StructCodegen.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..2160084955c8955d0bc34d60780ffb8b5e1b57dc
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/StructCodegen.ts
>@@ -0,0 +1,67 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class StructCodegen extends Visitor {
>+    private _node: StructType;
>+    private _typeNamer: MSLTypeNamer;
>+    private _lineNumbers: number[];
>+    private _typeAttributes: TypeAttributes;
>+
>+    private _forwardDeclaration: StructForwardDeclaration;
>+    private _finalDefinition: StructFinalDefinition | ArrayRefDefinition;
>+
>+    constructor(node: StructType, typeNamer, lineNos, typeAttributes)
>+    {
>+        super();
>+        this._node = node;
>+        this._typeNamer = typeNamer;
>+        this._lineNumbers = lineNos;
>+        this._typeAttributes = typeAttributes;
>+
>+        Node.visit(node, this);
>+    }
>+
>+    get forwardDeclaration()
>+    {
>+        return this._forwardDeclaration;
>+    }
>+
>+    get finalDefinition()
>+    {
>+        return this._finalDefinition;
>+    }
>+
>+    visitStructType(node)
>+    {
>+        this._forwardDeclaration = new StructForwardDeclaration(node, this._typeNamer, this._lineNumbers);
>+        this._finalDefinition = new StructFinalDefinition(node, this._typeNamer, this._lineNumbers, this._typeAttributes);
>+    }
>+
>+    visitArrayRefType(node)
>+    {
>+        this._forwardDeclaration = new StructForwardDeclaration(node, this._typeNamer, this._lineNumbers);
>+        this._finalDefinition = new ArrayRefDefinition(node, this._typeNamer);
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/StructFinalDefinition.ts b/Tools/WebGPUShadingLanguageRI/Metal/StructFinalDefinition.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..5c834e6c8f4e1778d23fd55d7361ee3aee88a06c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/StructFinalDefinition.ts
>@@ -0,0 +1,87 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class StructFinalDefinition {
>+    private _structType: StructType;
>+    private _typeNamer: MSLTypeNamer;
>+    private _lineNumbers: number[];
>+    private _typeAttributes: TypeAttributes;
>+
>+    constructor(structType: StructType, typeNamer: MSLTypeNamer, lineNos: number[], typeAttributes: TypeAttributes)
>+    {
>+        this._structType = structType;
>+        this._typeNamer = typeNamer;
>+        this._lineNumbers = lineNos;
>+        this._typeAttributes = typeAttributes;
>+    }
>+
>+    get structType()
>+    {
>+        return this._structType;
>+    }
>+
>+    toString()
>+    {
>+        let src = "";
>+        if (this._structType.name) {
>+            src += `// ${this._structType.name}`;
>+            if (this._lineNumbers && this._structType.origin && this._lineNumbers[this._structType.origin.index])
>+                src += ` @ line ${this._lineNumbers[this._structType.origin.index]}`;
>+            src += "\n";
>+        }
>+        src += `struct ${this._typeNamer.uniqueTypeId(this._structType)} {\n`;
>+
>+        let index = 0;
>+        for (let [fieldName,field] of this._structType.fieldMap) {
>+            let addAttribute = true;
>+            const typeName = this._typeNamer.mslTypeName(field.type);
>+            const mangledFieldName = this._typeAttributes.mangledFieldName(fieldName);
>+            src += `    ${new VarOrFieldDeclaration(this._typeNamer, field.type, mangledFieldName)}`;
>+
>+            const annotations = [];
>+
>+            // FIXME: These aren't in the spec yet but are needed for the compiled code to work.
>+            if (this._typeAttributes.isVertexAttribute)
>+                annotations.push(`attribute(${index++})`);
>+
>+            if (this._typeAttributes.isVertexOutputOrFragmentInput && fieldName === "wsl_Position")
>+                annotations.push("position");
>+
>+            if (this._typeAttributes.isFragmentOutput && fieldName === "wsl_Color") {
>+                // Argument is the color attachment index; we're currently only using 0.
>+                annotations.push("color(0)");
>+            }
>+
>+            if (annotations.length)
>+                src += ` [[${annotations.join(", ")}]]`;
>+
>+            src += ";\n";
>+        }
>+
>+        src += "};";
>+
>+        return src;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/StructForwardDeclaration.ts b/Tools/WebGPUShadingLanguageRI/Metal/StructForwardDeclaration.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..80a4b7682d9ae249f1ead1e97157dd7f1b7f3f8a
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/StructForwardDeclaration.ts
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class StructForwardDeclaration {
>+    private _structType: StructType;
>+    private _typeNamer: MSLTypeNamer;
>+    private _lineNumbers: number[];
>+
>+    constructor(structType: StructType, typeNamer: MSLTypeNamer, lineNos: number[])
>+    {
>+        this._structType = structType;
>+        this._typeNamer = typeNamer;
>+        this._lineNumbers = lineNos;
>+    }
>+
>+    get structType()
>+    {
>+        return this._structType;
>+    }
>+
>+    toString()
>+    {
>+        let str = `struct ${this._typeNamer.uniqueTypeId(this._structType)};`;
>+        if (this._structType.name) {
>+            str += ` // ${this._structType.name}`;
>+            if (this._lineNumbers && this._structType.origin && this._lineNumbers[this._structType.origin.index])
>+                str += ` @ line ${this._lineNumbers[this._structType.origin.index]}`;
>+
>+        } else
>+            str += ` // ${this._structType}`;
>+
>+        return str;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/Token.ts b/Tools/WebGPUShadingLanguageRI/Metal/Token.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..f2a364dd4839e8af4d328e5f8058fc6088d1e51c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/Token.ts
>@@ -0,0 +1,58 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// The output of MSLLexer.
>+class Token {
>+    private _type: string;
>+    private _src: string;
>+    private _startIndex: number;
>+
>+    constructor(type, src, start)
>+    {
>+        this._type = type;
>+        this._src = src;
>+        this._startIndex = start;
>+    }
>+
>+    get type(): string
>+    {
>+        return this._type;
>+    }
>+
>+    get src(): string
>+    {
>+        return this._src;
>+    }
>+
>+    get startIndex(): number
>+    {
>+        return this._startIndex;
>+    }
>+
>+    set startIndex(i: number)
>+    {
>+        this._startIndex = i;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/TypeAttributes.ts b/Tools/WebGPUShadingLanguageRI/Metal/TypeAttributes.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..ebf9df0c0ca0a04b19d4921c28f5e2a4a01d92fe
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/TypeAttributes.ts
>@@ -0,0 +1,91 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+class TypeAttributes {
>+    private _type: any;
>+    private _isVertexAttribute: boolean;
>+    private _isVertexOutputOrFragmentInput: boolean;
>+    private _isFragmentOutput: boolean;
>+    private _fieldMangler: NameMangler;
>+
>+    constructor(type)
>+    {
>+        this._type = false;
>+        this._isVertexAttribute = false;
>+        this._isVertexOutputOrFragmentInput = false;
>+        this._isFragmentOutput = false;
>+        this._fieldMangler = new NameMangler('field');
>+
>+        if (type instanceof StructType) {
>+            for (let field of type.fields)
>+                this._fieldMangler.mangle(field.name)
>+        }
>+    }
>+
>+    get type()
>+    {
>+        return this._type;
>+    }
>+
>+    get isVertexAttribute()
>+    {
>+        return this._isVertexAttribute;
>+    }
>+
>+    set isVertexAttribute(va)
>+    {
>+        this._isVertexAttribute = va;
>+    }
>+
>+    get isVertexOutputOrFragmentInput()
>+    {
>+        return this._isVertexOutputOrFragmentInput;
>+    }
>+
>+    set isVertexOutputOrFragmentInput(vo)
>+    {
>+        this._isVertexOutputOrFragmentInput = vo;
>+    }
>+
>+    get isFragmentOutput()
>+    {
>+        return this._isFragmentOutput;
>+    }
>+
>+    set isFragmentOutput(fo)
>+    {
>+        this._isFragmentOutput = fo;
>+    }
>+
>+    get fieldMangler()
>+    {
>+        return this._fieldMangler;
>+    }
>+
>+    mangledFieldName(fieldName)
>+    {
>+        return this.fieldMangler.mangle(fieldName);
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/TypeOfExpression.ts b/Tools/WebGPUShadingLanguageRI/Metal/TypeOfExpression.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..d6543b558ef096a8fad85a7b533f3020c2e7f08d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/TypeOfExpression.ts
>@@ -0,0 +1,318 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+function typeOf(node: Node): Type {
>+    class TypeVisitor extends Visitor {
>+
>+        visitAnonymousVariable(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitArrayRefType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitArrayType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitAssignment(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitCallExpression(node)
>+        {
>+            return Node.visit(node.func, this);
>+        }
>+
>+        visitCommaExpression(node)
>+        {
>+            return Node.visit(node.list[node.list.length - 1], this);
>+        }
>+
>+        visitDotExpression(node)
>+        {
>+            return node.struct.fieldMap.get(node.fieldName).type;
>+        }
>+
>+        visitElementalType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitEnumType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitField(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitFunc(node)
>+        {
>+            return node.returnType;
>+        }
>+
>+        visitFuncDef(node)
>+        {
>+            return node.returnType;
>+        }
>+
>+        visitFuncParameter(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitFunctionLikeBlock(node)
>+        {
>+            return node.returnType;
>+        }
>+
>+        visitGenericLiteralType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitIdentityExpression(node)
>+        {
>+            return Node.visit(node.target, this);
>+        }
>+
>+        visitIndexExpression(node)
>+        {
>+            return Node.visit(node.array.elementType, this);
>+        }
>+
>+        visitLogicalExpression(node)
>+        {
>+            throw new Error("TODO: Implement TypeVisitor.visitLogicalExpression");
>+        }
>+
>+        visitLogicalNot(node)
>+        {
>+            return Node.visit(node.operand, this);
>+        }
>+
>+        visitMakeArrayRefExpression(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitMakePtrExpression(node)
>+        {
>+            throw new Error("TODO: Implement TypeVisitor.visitMakePtrExpression");
>+        }
>+
>+        visitNativeFunc(node)
>+        {
>+            return node.returnType;
>+        }
>+
>+        visitNativeFuncInstance(node)
>+        {
>+            return node.returnType;
>+        }
>+
>+        visitNativeType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitNativeTypeInstance(node)
>+        {
>+            return node;
>+        }
>+
>+        visitNullLiteral(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitNullType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitPtrType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitReadModifyWriteExpression(node)
>+        {
>+            throw new Error("TODO: Implement TypeVisitor.visitReadModifyWriteExpression");
>+        }
>+
>+        visitReferenceType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitStructType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitTypeDef(node)
>+        {
>+            return node;
>+        }
>+
>+        visitTypeRef(node)
>+        {
>+            return node;
>+        }
>+
>+        visitTypeVariable(node)
>+        {
>+            return node;
>+        }
>+
>+        visitVariableDecl(node)
>+        {
>+            return node.type;
>+        }
>+
>+        visitVariableRef(node)
>+        {
>+            return node.variable.type;
>+        }
>+
>+        visitBlock(node)
>+        {
>+            throw new Error("Block has no type");
>+        }
>+
>+        visitBoolLiteral(node)
>+        {
>+            throw new Error("BoolLiteral has no type");
>+        }
>+
>+        visitBreak(node)
>+        {
>+            throw new Error("Break has no type");
>+        }
>+
>+        visitConstexprTypeParameter(node)
>+        {
>+            throw new Error("ConstexprTypeParameter has no type");
>+        }
>+
>+        visitContinue(node)
>+        {
>+            throw new Error("Continue has no type");
>+        }
>+
>+        visitConvertPtrToArrayRefExpression(node)
>+        {
>+            throw new Error("ConvertPtrToArrayRefExpression has no type");
>+        }
>+
>+        visitDereferenceExpression(node)
>+        {
>+            throw new Error("DereferenceExpression has no type");
>+        }
>+
>+        visitDoWhileLoop(node)
>+        {
>+            throw new Error("DoWhileLoop has no type");
>+        }
>+
>+        visitEnumLiteral(node)
>+        {
>+            throw new Error("EnumLiteral has no type");
>+        }
>+
>+        visitEnumMember(node)
>+        {
>+            throw new Error("EnumMember has no type");
>+        }
>+
>+        visitForLoop(node)
>+        {
>+            throw new Error("ForLoop has no type");
>+        }
>+        visitGenericLiteral(node)
>+        {
>+            throw new Error("GenericLiteral has no type");
>+        }
>+        visitIfStatement(node)
>+        {
>+            throw new Error("IfStatement has no type");
>+        }
>+
>+        visitProgram(node)
>+        {
>+            throw new Error("Program has no type");
>+        }
>+
>+        visitProtocolDecl(node)
>+        {
>+            throw new Error("ProtocolDecl has no type");
>+        }
>+
>+        visitProtocolFuncDecl(node)
>+        {
>+            throw new Error("ProtocolFuncDecl has no type");
>+        }
>+
>+        visitProtocolRef(node)
>+        {
>+            throw new Error("ProtocolRef has no type");
>+        }
>+
>+        visitReturn(node)
>+        {
>+            throw new Error("Return has no type");
>+        }
>+
>+        visitSwitchCase(node)
>+        {
>+            throw new Error("SwitchCase has no type");
>+        }
>+
>+        visitSwitchStatement(node)
>+        {
>+            throw new Error("SwitchStatement has no type");
>+        }
>+
>+        visitTrapStatement(node)
>+        {
>+            throw new Error("TrapStatement has no type");
>+        }
>+
>+        visitWhileLoop(node)
>+        {
>+            throw new Error("WhileLoop has no type");
>+        }
>+    }
>+    return Node.visit(node, new TypeVisitor());
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/TypeSorter.ts b/Tools/WebGPUShadingLanguageRI/Metal/TypeSorter.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..a57ed8f08814e6314d00c9b3d53eb3fd37e27671
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/TypeSorter.ts
>@@ -0,0 +1,70 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// This class finds the topological order for type declarations.
>+class TypeSorter extends Visitor {
>+    private _typeUnifier: TypeUnifier;
>+    private _visitedSet: Set<string>;
>+    private _visitedOrder: Type[];
>+
>+    constructor(typeUnifier, types)
>+    {
>+        super();
>+        this._typeUnifier = typeUnifier;
>+        this._visitedSet = new Set();
>+        this._visitedOrder = [];
>+
>+        for (let type of types)
>+            type.visit(this);
>+    }
>+
>+    get topologicalOrder()
>+    {
>+        return this._visitedOrder.slice().reverse();
>+    }
>+
>+    visitEnumType(node)
>+    {
>+        const id = this._typeUnifier.uniqueTypeId(node);
>+        if (!this._visitedSet.has(id))
>+            this._visitedOrder.push(node);
>+        this._visitedSet.add(id);
>+    }
>+
>+    visitStructType(node)
>+    {
>+        const id = this._typeUnifier.uniqueTypeId(node);
>+        if (!this._visitedSet.has(id)) {
>+            this._visitedOrder.push(node);
>+            super.visitStructType(node);
>+        }
>+        this._visitedSet.add(id);
>+    }
>+
>+    visitReferenceType(node)
>+    {
>+        // An empty implementation ensures that we don't recurse into the element type and needlessly create dependencies.
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/TypeUnifier.ts b/Tools/WebGPUShadingLanguageRI/Metal/TypeUnifier.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..ca8f1632bd032badd33b58c2fb044bcf0bc5ee71
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/TypeUnifier.ts
>@@ -0,0 +1,293 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// Replaces equivalent (but not identical) type instances with identical
>+// instances. The SPIR-V compiler depended on toString and allowed for
>+// TypeRef instances in the the Type tree. This class replaces each type
>+// that it discovers with a unique equivalent instance and collapses
>+// TypeRef instances by instantiating them where necessary. In order to
>+// determine equivalence it uses a separate stringification algorithm (so
>+// that we don't depend on the implementation of toString).
>+class TypeUnifier extends Rewriter {
>+
>+    private _nativeTypes: Map<any, any>;
>+    private _enumTypes: Map<any, any>;
>+    private _typeRefs: Map<any, any>;
>+    private _structTypes: Map<any, any>;
>+    private _arrayTypes: Map<any, any>;
>+    private _arrayRefTypes: Map<any, any>;
>+    private _pointerTypes: Map<any, any>;
>+    private _allTypes: Set<any>;
>+    private _typeUniqueID: Map<any, any>;
>+
>+    constructor()
>+    {
>+        super();
>+        this._nativeTypes = new Map();
>+        this._enumTypes = new Map();
>+        this._typeRefs = new Map();
>+        this._structTypes = new Map();
>+        this._arrayTypes = new Map();
>+        this._arrayRefTypes = new Map();
>+        this._pointerTypes = new Map();
>+        this._allTypes = new Set();
>+        this._typeUniqueID = new Map();
>+    }
>+
>+    get allTypes()
>+    {
>+        return this._allTypes;
>+    }
>+
>+    unifyTypes(node)
>+    {
>+        return node.visit(this);
>+    }
>+
>+    uniqueTypeId(type)
>+    {
>+        return this._typeUniqueID.get(this.uniqueName(this.unifyTypes(type)));
>+    }
>+
>+    // The Rewriter class doesn't recurse in the desired way, hence the overload.
>+    visitFuncDef(node)
>+    {
>+        if (node.typeParameters.length)
>+            throw new Error(`Cannot unify types of polymorphic function ${node}`);
>+        node._returnType = node.returnType.visit(this);
>+        node._parameters = node.parameters.map(param => param.visit(this));
>+        node._body = node.body.visit(this);
>+        return node;
>+    }
>+
>+    // The Rewriter class doesn't recurse in the desired way, hence the overload.
>+    visitFunc(node)
>+    {
>+        if (node.typeParameters.length)
>+            throw new Error(`Cannot unify types of polymorphic function ${node}`);
>+        node._returnType = node.returnType.visit(this);
>+        node._parameters = node.parameters.map(param => param.visit(this));
>+        return node;
>+    }
>+
>+    visitNativeFuncInstance(node)
>+    {
>+        if (node.typeParameters.length)
>+            throw new Error(`Cannot unify types of polymorphic function ${node}`);
>+        let returnType = node.returnType.visit(this);
>+        let parameters = node.parameters.map(param => param.visit(this));
>+
>+        let implementationData = null;
>+
>+        if (node.implementationData) {
>+            implementationData = Object.assign({}, node.implementationData);
>+            implementationData.type = node.implementationData.type.visit(this);
>+        }
>+
>+        let func = node.func.visit(this);
>+        return new NativeFuncInstance(func, returnType, parameters, func.isCast, func.shaderType, implementationData);
>+    }
>+
>+    visitCallExpression(node)
>+    {
>+        let result = new CallExpression(
>+                    node.origin, node.name,
>+                    node.typeArguments.map(typeArgument => typeArgument.visit(this)),
>+                    node.argumentList.map(argument => Node.visit(argument, this)));
>+
>+        let handleTypeArguments = actualTypeArguments => {
>+            if (actualTypeArguments)
>+                return actualTypeArguments.map(actualTypeArgument => actualTypeArgument.visit(this));
>+            else
>+                return null;
>+        }
>+
>+        result.actualTypeArguments = handleTypeArguments(node.actualTypeArguments);
>+        result.instantiatedActualTypeArguments = handleTypeArguments(node.instantiatedActualTypeArguments);
>+
>+        let argumentTypes = node.argumentTypes;
>+        if (argumentTypes)
>+            result.argumentTypes = argumentTypes.map(argumentType => argumentType.visit(this));
>+
>+        result.func = node.func.visit(this);
>+        result.nativeFuncInstance = Node.visit(node.nativeFuncInstance, this);
>+
>+        // The possible overloads can contain type variables; this is OK because we never visit them.
>+        result.possibleOverloads = node.possibleOverloads;
>+
>+        if (node.isCast)
>+            result.setCastData(node.returnType.visit(this));
>+
>+        result.resultType = Node.visit(node.resultType, this);
>+        result.resultEPtr = node.resultEPtr;
>+
>+        return result;
>+    }
>+
>+    visitTypeRef(node)
>+    {
>+        if (node.typeArguments.length) {
>+            if (node.type.instantiate)
>+                return node.type.instantiate(node.typeArguments).visit(this);
>+             else
>+                throw new Error(`Could not instantiate type ${node}`);
>+        } else
>+            return node.type.visit(this);
>+    }
>+
>+    _createTypeIfNotExists(map, value)
>+    {
>+        const key = this.uniqueName(value);
>+        if (map.has(key))
>+            return map.get(key);
>+        else {
>+            this._allTypes.add(value);
>+            map.set(key, value);
>+            this._typeUniqueID.set(key, `T${this._typeUniqueID.size}`);
>+            return value;
>+        }
>+    }
>+
>+    // Used for determing equivalence of type instances that do not include TypeRef, i.e. fully concrete types.
>+    uniqueName(type)
>+    {
>+        class TypeUniqueNamer extends Visitor {
>+
>+            visitNativeType(node)
>+            {
>+                return node.name;
>+            }
>+
>+            visitPtrType(node)
>+            {
>+                return `${node.elementType.visit(this)}* ${node.addressSpace}`;
>+            }
>+
>+            visitArrayType(node)
>+            {
>+                return `${node.elementType.visit(this)}[${node.numElements}]`;
>+            }
>+
>+            visitArrayRefType(node)
>+            {
>+                return `${node.elementType.visit(this)}[] ${node.addressSpace}`;
>+            }
>+
>+            visitEnumType(node)
>+            {
>+                return `enum ${node.name} : ${node.baseType.visit(this)}`;
>+            }
>+
>+            visitStructType(node)
>+            {
>+                let fields = [];
>+                for (let field of node.fields)
>+                    fields.push(`${field.type.visit(this)} ${field.name}`);
>+
>+                return `struct ${node.name} { ${fields.join("; ")} }`;
>+            }
>+        }
>+
>+        return type.visit(new TypeUniqueNamer());
>+    }
>+
>+    visitStructType(node)
>+    {
>+        const value = new StructType(node.origin, node.name, []);
>+        for (let field of node.fields)
>+            value.add(new Field(field.origin, field.name, field.type.visit(this)));
>+
>+        return this._createTypeIfNotExists(this._structTypes, value);
>+    }
>+
>+    visitEnumType(node)
>+    {
>+        const baseType = node.baseType.visit(this);
>+        const value = new EnumType(node.origin, node.name, baseType);
>+        return this._createTypeIfNotExists(this._enumTypes, value);
>+    }
>+
>+    visitNativeType(node)
>+    {
>+        return this._createTypeIfNotExists(this._nativeTypes, node);
>+    }
>+
>+    visitArrayType(node)
>+    {
>+        const elementType = node.elementType.visit(this);
>+        const value = new ArrayType(node.origin, elementType, node.numElements);
>+        return this._createTypeIfNotExists(this._arrayTypes, value);
>+    }
>+
>+    visitArrayRefType(node)
>+    {
>+        const elementType = node.elementType.visit(this);
>+        const value = new ArrayRefType(node.origin, node.addressSpace, elementType);
>+        return this._createTypeIfNotExists(this._arrayRefTypes, value);
>+    }
>+
>+    visitPtrType(node)
>+    {
>+        const elementType = node.elementType.visit(this);
>+        const value = new PtrType(node.origin, node.addressSpace, elementType);
>+        return this._createTypeIfNotExists(this._pointerTypes, value);
>+    }
>+
>+    typesThatNeedDeclaration()
>+    {
>+        const declSet = new Set();
>+        for (let type of this._allTypes) {
>+            let needsDecl = false;
>+            const typeUnifier = this;
>+            class NeedsDeclaration extends Visitor
>+            {
>+                visitElementalType(node) {}
>+                visitStructType(node)
>+                {
>+                    needsDecl = !typeUnifier._structIsNative(node);
>+                }
>+
>+                visitArrayRefType(node)
>+                {
>+                    needsDecl = true;
>+                }
>+            }
>+            type.visit(new NeedsDeclaration());
>+            if (needsDecl)
>+                declSet.add(type);
>+        }
>+        return declSet;
>+    }
>+
>+    _structIsNative(node)
>+    {
>+        // TODO: Avoid all this specification and actually tag these types in some reasonable way.
>+        if (node.name == "vec2" || node.name == "vec3" || node.name == "vec4") {
>+            const elementType = node.fields.next().value.type;
>+            return elementType.isNative && (elementType.name == "uint8" || elementType.name == "int32" || elementType.name == "uint32" || elementType.name == "bool" || elementType.name == "float32");
>+        }
>+        return false;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/VarOrFieldDeclaration.ts b/Tools/WebGPUShadingLanguageRI/Metal/VarOrFieldDeclaration.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..27a2c1e85e3a7ac78594e856fec8ab90478d2815
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/VarOrFieldDeclaration.ts
>@@ -0,0 +1,68 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * 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.
>+ */
>+
>+// The type namer doesn't handle arrays in the style needed for declarations
>+// because in MSL array declarations are of the form T x[n] --- I don't believe
>+// that there is a way of keeping the whole of the type on the left.
>+class VarOrFieldDeclaration {
>+    private _typeNamer: MSLTypeNamer;
>+    private _type: Type;
>+    private _name: string;
>+
>+    constructor(typeNamer, type, name)
>+    {
>+        this._typeNamer = typeNamer;
>+        this._type = type;
>+        this._name = name;
>+    }
>+
>+    get typeNamer()
>+    {
>+        return this._typeNamer;
>+    }
>+
>+    get type()
>+    {
>+        return this._type;
>+    }
>+
>+    get name()
>+    {
>+        return this._name;
>+    }
>+
>+    toString()
>+    {
>+        if (this.type.isArray) {
>+            const arrayType = <ArrayType>this.type;
>+            const typeName = this.typeNamer.mslTypeName(arrayType.elementType);
>+            const numElements = arrayType.numElements.value;
>+            return `${typeName} ${this.name}[${numElements}]`;
>+        } else {
>+            const typeName = this.typeNamer.mslTypeName(this.type);
>+            return `${typeName} ${this.name}`;
>+        }
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/.gitignore b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/.gitignore
>new file mode 100644
>index 0000000000000000000000000000000000000000..c3b9a22cb1aceb00014bf5682b83c33126c9632b
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/.gitignore	
>@@ -0,0 +1,3 @@
>+WHLSL Tests.xcodeproj/xcuserdata
>+WHLSL Tests.xcodeproj/project.xcworkspace/xcshareddata
>+WHLSL Tests.xcodeproj/project.xcworkspace/xcuserdata
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..8529948d2a69df8fc1c861d7850bc503e9f5e9e6
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.h	
>@@ -0,0 +1,15 @@
>+//
>+//  AppDelegate.h
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Cocoa/Cocoa.h>
>+
>+@interface AppDelegate : NSObject <NSApplicationDelegate>
>+
>+
>+@end
>+
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..368a84a73fdb85b52447560386af20ce25e86cbc
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/AppDelegate.m	
>@@ -0,0 +1,27 @@
>+//
>+//  AppDelegate.m
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "AppDelegate.h"
>+
>+@interface AppDelegate ()
>+
>+@end
>+
>+@implementation AppDelegate
>+
>+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
>+    // Insert code here to initialize your application
>+}
>+
>+
>+- (void)applicationWillTerminate:(NSNotification *)aNotification {
>+    // Insert code here to tear down your application
>+}
>+
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/AppIcon.appiconset/Contents.json b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/AppIcon.appiconset/Contents.json
>new file mode 100644
>index 0000000000000000000000000000000000000000..2db2b1c7c6c316500a7a34807648434289494ba1
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/AppIcon.appiconset/Contents.json	
>@@ -0,0 +1,58 @@
>+{
>+  "images" : [
>+    {
>+      "idiom" : "mac",
>+      "size" : "16x16",
>+      "scale" : "1x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "16x16",
>+      "scale" : "2x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "32x32",
>+      "scale" : "1x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "32x32",
>+      "scale" : "2x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "128x128",
>+      "scale" : "1x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "128x128",
>+      "scale" : "2x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "256x256",
>+      "scale" : "1x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "256x256",
>+      "scale" : "2x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "512x512",
>+      "scale" : "1x"
>+    },
>+    {
>+      "idiom" : "mac",
>+      "size" : "512x512",
>+      "scale" : "2x"
>+    }
>+  ],
>+  "info" : {
>+    "version" : 1,
>+    "author" : "xcode"
>+  }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/Contents.json b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/Contents.json
>new file mode 100644
>index 0000000000000000000000000000000000000000..da4a164c918651cdd1e11dca5cc62c333f097601
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Assets.xcassets/Contents.json	
>@@ -0,0 +1,6 @@
>+{
>+  "info" : {
>+    "version" : 1,
>+    "author" : "xcode"
>+  }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Base.lproj/Main.storyboard b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Base.lproj/Main.storyboard
>new file mode 100644
>index 0000000000000000000000000000000000000000..c676d9f74cc567bff56bed1dd565dcdd70beb3df
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Base.lproj/Main.storyboard	
>@@ -0,0 +1,847 @@
>+<?xml version="1.0" encoding="UTF-8"?>
>+<document type="com.apple.InterfaceBuilder3.Cocoa.Storyboard.XIB" version="3.0" toolsVersion="14269.14" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" initialViewController="B8D-0N-5wS">
>+    <dependencies>
>+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14269.14"/>
>+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
>+    </dependencies>
>+    <scenes>
>+        
>+        <scene sceneID="JPo-4y-FX3">
>+            <objects>
>+                <application id="hnw-xV-0zn" sceneMemberID="viewController">
>+                    <menu key="mainMenu" title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
>+                        <items>
>+                            <menuItem title="WHLSL Tests" id="1Xt-HY-uBw">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="WHLSL Tests" systemMenu="apple" id="uQy-DD-JDr">
>+                                    <items>
>+                                        <menuItem title="About WHLSL Tests" id="5kV-Vb-QxS">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="orderFrontStandardAboutPanel:" target="Ady-hI-5gd" id="Exp-CZ-Vem"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="VOq-y0-SEH"/>
>+                                        <menuItem title="Preferencesâ¦" keyEquivalent="," id="BOF-NM-1cW"/>
>+                                        <menuItem isSeparatorItem="YES" id="wFC-TO-SCJ"/>
>+                                        <menuItem title="Services" id="NMo-om-nkz">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Services" systemMenu="services" id="hz9-B4-Xy5"/>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="4je-JR-u6R"/>
>+                                        <menuItem title="Hide WHLSL Tests" keyEquivalent="h" id="Olw-nP-bQN">
>+                                            <connections>
>+                                                <action selector="hide:" target="Ady-hI-5gd" id="PnN-Uc-m68"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Hide Others" keyEquivalent="h" id="Vdr-fp-XzO">
>+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                            <connections>
>+                                                <action selector="hideOtherApplications:" target="Ady-hI-5gd" id="VT4-aY-XCT"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Show All" id="Kd2-mp-pUS">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="unhideAllApplications:" target="Ady-hI-5gd" id="Dhg-Le-xox"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
>+                                        <menuItem title="Quit WHLSL Tests" keyEquivalent="q" id="4sb-4s-VLi">
>+                                            <connections>
>+                                                <action selector="terminate:" target="Ady-hI-5gd" id="Te7-pn-YzF"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="File" id="dMs-cI-mzQ">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="File" id="bib-Uj-vzu">
>+                                    <items>
>+                                        <menuItem title="New" keyEquivalent="n" id="Was-JA-tGl">
>+                                            <connections>
>+                                                <action selector="newDocument:" target="Ady-hI-5gd" id="4Si-XN-c54"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Openâ¦" keyEquivalent="o" id="IAo-SY-fd9">
>+                                            <connections>
>+                                                <action selector="openDocument:" target="Ady-hI-5gd" id="bVn-NM-KNZ"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Default" keyEquivalent="D" id="aei-2z-FdS">
>+                                            <connections>
>+                                                <action selector="loadDefault:" target="Ady-hI-5gd" id="Qkc-mo-M8q"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Mandelbrot" keyEquivalent="d" id="Oo7-Lv-ixZ">
>+                                            <connections>
>+                                                <action selector="loadMandelbrot:" target="Ady-hI-5gd" id="rBu-TY-q9u"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Julia" keyEquivalent="j" id="ghn-TO-Pf8">
>+                                            <connections>
>+                                                <action selector="loadJulia:" target="Ady-hI-5gd" id="Ld3-NY-hjZ"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Recent" id="tXI-mr-wws">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Open Recent" systemMenu="recentDocuments" id="oas-Oc-fiZ">
>+                                                <items>
>+                                                    <menuItem title="Clear Menu" id="vNY-rz-j42">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="clearRecentDocuments:" target="Ady-hI-5gd" id="Daa-9d-B3U"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Open Native Flat Color" id="4fF-le-bz2">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="loadNativeFlatColor:" target="Ady-hI-5gd" id="D8V-tT-Uue"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Native Mandelbrot" id="vkA-g5-K5f">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="loadNativeMandelbrot:" target="Ady-hI-5gd" id="f0f-zP-EXZ"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Open Native Julia" id="rag-hI-17H">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="loadNativeJulia:" target="Ady-hI-5gd" id="lVh-ll-sg8"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="m54-Is-iLE"/>
>+                                        <menuItem title="Close" keyEquivalent="w" id="DVo-aG-piG">
>+                                            <connections>
>+                                                <action selector="performClose:" target="Ady-hI-5gd" id="HmO-Ls-i7Q"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Saveâ¦" keyEquivalent="s" id="pxx-59-PXV">
>+                                            <connections>
>+                                                <action selector="saveDocument:" target="Ady-hI-5gd" id="teZ-XB-qJY"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Save Asâ¦" keyEquivalent="S" id="Bw7-FT-i3A">
>+                                            <connections>
>+                                                <action selector="saveDocumentAs:" target="Ady-hI-5gd" id="mDf-zr-I0C"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Revert to Saved" keyEquivalent="r" id="KaW-ft-85H">
>+                                            <connections>
>+                                                <action selector="revertDocumentToSaved:" target="Ady-hI-5gd" id="iJ3-Pv-kwq"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="aJh-i4-bef"/>
>+                                        <menuItem title="Page Setupâ¦" keyEquivalent="P" id="qIS-W8-SiK">
>+                                            <modifierMask key="keyEquivalentModifierMask" shift="YES" command="YES"/>
>+                                            <connections>
>+                                                <action selector="runPageLayout:" target="Ady-hI-5gd" id="Din-rz-gC5"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Printâ¦" keyEquivalent="p" id="aTl-1u-JFS">
>+                                            <connections>
>+                                                <action selector="print:" target="Ady-hI-5gd" id="qaZ-4w-aoO"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="Edit" id="5QF-Oa-p0T">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="Edit" id="W48-6f-4Dl">
>+                                    <items>
>+                                        <menuItem title="Undo" keyEquivalent="z" id="dRJ-4n-Yzg">
>+                                            <connections>
>+                                                <action selector="undo:" target="Ady-hI-5gd" id="M6e-cu-g7V"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Redo" keyEquivalent="Z" id="6dh-zS-Vam">
>+                                            <connections>
>+                                                <action selector="redo:" target="Ady-hI-5gd" id="oIA-Rs-6OD"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="WRV-NI-Exz"/>
>+                                        <menuItem title="Cut" keyEquivalent="x" id="uRl-iY-unG">
>+                                            <connections>
>+                                                <action selector="cut:" target="Ady-hI-5gd" id="YJe-68-I9s"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Copy" keyEquivalent="c" id="x3v-GG-iWU">
>+                                            <connections>
>+                                                <action selector="copy:" target="Ady-hI-5gd" id="G1f-GL-Joy"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Paste" keyEquivalent="v" id="gVA-U4-sdL">
>+                                            <connections>
>+                                                <action selector="paste:" target="Ady-hI-5gd" id="UvS-8e-Qdg"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Paste and Match Style" keyEquivalent="V" id="WeT-3V-zwk">
>+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                            <connections>
>+                                                <action selector="pasteAsPlainText:" target="Ady-hI-5gd" id="cEh-KX-wJQ"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Delete" id="pa3-QI-u2k">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="delete:" target="Ady-hI-5gd" id="0Mk-Ml-PaM"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Select All" keyEquivalent="a" id="Ruw-6m-B2m">
>+                                            <connections>
>+                                                <action selector="selectAll:" target="Ady-hI-5gd" id="VNm-Mi-diN"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="uyl-h8-XO2"/>
>+                                        <menuItem title="Find" id="4EN-yA-p0u">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Find" id="1b7-l0-nxx">
>+                                                <items>
>+                                                    <menuItem title="Findâ¦" tag="1" keyEquivalent="f" id="Xz5-n4-O0W">
>+                                                        <connections>
>+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="cD7-Qs-BN4"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Find and Replaceâ¦" tag="12" keyEquivalent="f" id="YEy-JH-Tfz">
>+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                                        <connections>
>+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="WD3-Gg-5AJ"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Find Next" tag="2" keyEquivalent="g" id="q09-fT-Sye">
>+                                                        <connections>
>+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="NDo-RZ-v9R"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Find Previous" tag="3" keyEquivalent="G" id="OwM-mh-QMV">
>+                                                        <connections>
>+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="HOh-sY-3ay"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Use Selection for Find" tag="7" keyEquivalent="e" id="buJ-ug-pKt">
>+                                                        <connections>
>+                                                            <action selector="performFindPanelAction:" target="Ady-hI-5gd" id="U76-nv-p5D"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Jump to Selection" keyEquivalent="j" id="S0p-oC-mLd">
>+                                                        <connections>
>+                                                            <action selector="centerSelectionInVisibleArea:" target="Ady-hI-5gd" id="IOG-6D-g5B"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Spelling and Grammar" id="Dv1-io-Yv7">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Spelling" id="3IN-sU-3Bg">
>+                                                <items>
>+                                                    <menuItem title="Show Spelling and Grammar" keyEquivalent=":" id="HFo-cy-zxI">
>+                                                        <connections>
>+                                                            <action selector="showGuessPanel:" target="Ady-hI-5gd" id="vFj-Ks-hy3"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Check Document Now" keyEquivalent=";" id="hz2-CU-CR7">
>+                                                        <connections>
>+                                                            <action selector="checkSpelling:" target="Ady-hI-5gd" id="fz7-VC-reM"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="bNw-od-mp5"/>
>+                                                    <menuItem title="Check Spelling While Typing" id="rbD-Rh-wIN">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleContinuousSpellChecking:" target="Ady-hI-5gd" id="7w6-Qz-0kB"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Check Grammar With Spelling" id="mK6-2p-4JG">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleGrammarChecking:" target="Ady-hI-5gd" id="muD-Qn-j4w"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Correct Spelling Automatically" id="78Y-hA-62v">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticSpellingCorrection:" target="Ady-hI-5gd" id="2lM-Qi-WAP"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Substitutions" id="9ic-FL-obx">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Substitutions" id="FeM-D8-WVr">
>+                                                <items>
>+                                                    <menuItem title="Show Substitutions" id="z6F-FW-3nz">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="orderFrontSubstitutionsPanel:" target="Ady-hI-5gd" id="oku-mr-iSq"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="gPx-C9-uUO"/>
>+                                                    <menuItem title="Smart Copy/Paste" id="9yt-4B-nSM">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleSmartInsertDelete:" target="Ady-hI-5gd" id="3IJ-Se-DZD"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Smart Quotes" id="hQb-2v-fYv">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticQuoteSubstitution:" target="Ady-hI-5gd" id="ptq-xd-QOA"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Smart Dashes" id="rgM-f4-ycn">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticDashSubstitution:" target="Ady-hI-5gd" id="oCt-pO-9gS"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Smart Links" id="cwL-P1-jid">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticLinkDetection:" target="Ady-hI-5gd" id="Gip-E3-Fov"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Data Detectors" id="tRr-pd-1PS">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticDataDetection:" target="Ady-hI-5gd" id="R1I-Nq-Kbl"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Text Replacement" id="HFQ-gK-NFA">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleAutomaticTextReplacement:" target="Ady-hI-5gd" id="DvP-Fe-Py6"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Transformations" id="2oI-Rn-ZJC">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Transformations" id="c8a-y6-VQd">
>+                                                <items>
>+                                                    <menuItem title="Make Upper Case" id="vmV-6d-7jI">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="uppercaseWord:" target="Ady-hI-5gd" id="sPh-Tk-edu"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Make Lower Case" id="d9M-CD-aMd">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="lowercaseWord:" target="Ady-hI-5gd" id="iUZ-b5-hil"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Capitalize" id="UEZ-Bs-lqG">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="capitalizeWord:" target="Ady-hI-5gd" id="26H-TL-nsh"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Speech" id="xrE-MZ-jX0">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Speech" id="3rS-ZA-NoH">
>+                                                <items>
>+                                                    <menuItem title="Start Speaking" id="Ynk-f8-cLZ">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="startSpeaking:" target="Ady-hI-5gd" id="654-Ng-kyl"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Stop Speaking" id="Oyz-dy-DGm">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="stopSpeaking:" target="Ady-hI-5gd" id="dX8-6p-jy9"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="Format" id="jxT-CU-nIS">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="Format" id="GEO-Iw-cKr">
>+                                    <items>
>+                                        <menuItem title="Font" id="Gi5-1S-RQB">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Font" systemMenu="font" id="aXa-aM-Jaq">
>+                                                <items>
>+                                                    <menuItem title="Show Fonts" keyEquivalent="t" id="Q5e-8K-NDq">
>+                                                        <connections>
>+                                                            <action selector="orderFrontFontPanel:" target="YLy-65-1bz" id="WHr-nq-2xA"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Bold" tag="2" keyEquivalent="b" id="GB9-OM-e27">
>+                                                        <connections>
>+                                                            <action selector="addFontTrait:" target="YLy-65-1bz" id="hqk-hr-sYV"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Italic" tag="1" keyEquivalent="i" id="Vjx-xi-njq">
>+                                                        <connections>
>+                                                            <action selector="addFontTrait:" target="YLy-65-1bz" id="IHV-OB-c03"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Underline" keyEquivalent="u" id="WRG-CD-K1S">
>+                                                        <connections>
>+                                                            <action selector="underline:" target="Ady-hI-5gd" id="FYS-2b-JAY"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="5gT-KC-WSO"/>
>+                                                    <menuItem title="Bigger" tag="3" keyEquivalent="+" id="Ptp-SP-VEL">
>+                                                        <connections>
>+                                                            <action selector="modifyFont:" target="YLy-65-1bz" id="Uc7-di-UnL"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Smaller" tag="4" keyEquivalent="-" id="i1d-Er-qST">
>+                                                        <connections>
>+                                                            <action selector="modifyFont:" target="YLy-65-1bz" id="HcX-Lf-eNd"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="kx3-Dk-x3B"/>
>+                                                    <menuItem title="Kern" id="jBQ-r6-VK2">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <menu key="submenu" title="Kern" id="tlD-Oa-oAM">
>+                                                            <items>
>+                                                                <menuItem title="Use Default" id="GUa-eO-cwY">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="useStandardKerning:" target="Ady-hI-5gd" id="6dk-9l-Ckg"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Use None" id="cDB-IK-hbR">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="turnOffKerning:" target="Ady-hI-5gd" id="U8a-gz-Maa"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Tighten" id="46P-cB-AYj">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="tightenKerning:" target="Ady-hI-5gd" id="hr7-Nz-8ro"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Loosen" id="ogc-rX-tC1">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="loosenKerning:" target="Ady-hI-5gd" id="8i4-f9-FKE"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                            </items>
>+                                                        </menu>
>+                                                    </menuItem>
>+                                                    <menuItem title="Ligatures" id="o6e-r0-MWq">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <menu key="submenu" title="Ligatures" id="w0m-vy-SC9">
>+                                                            <items>
>+                                                                <menuItem title="Use Default" id="agt-UL-0e3">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="useStandardLigatures:" target="Ady-hI-5gd" id="7uR-wd-Dx6"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Use None" id="J7y-lM-qPV">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="turnOffLigatures:" target="Ady-hI-5gd" id="iX2-gA-Ilz"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Use All" id="xQD-1f-W4t">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="useAllLigatures:" target="Ady-hI-5gd" id="KcB-kA-TuK"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                            </items>
>+                                                        </menu>
>+                                                    </menuItem>
>+                                                    <menuItem title="Baseline" id="OaQ-X3-Vso">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <menu key="submenu" title="Baseline" id="ijk-EB-dga">
>+                                                            <items>
>+                                                                <menuItem title="Use Default" id="3Om-Ey-2VK">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="unscript:" target="Ady-hI-5gd" id="0vZ-95-Ywn"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Superscript" id="Rqc-34-cIF">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="superscript:" target="Ady-hI-5gd" id="3qV-fo-wpU"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Subscript" id="I0S-gh-46l">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="subscript:" target="Ady-hI-5gd" id="Q6W-4W-IGz"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Raise" id="2h7-ER-AoG">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="raiseBaseline:" target="Ady-hI-5gd" id="4sk-31-7Q9"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem title="Lower" id="1tx-W0-xDw">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="lowerBaseline:" target="Ady-hI-5gd" id="OF1-bc-KW4"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                            </items>
>+                                                        </menu>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="Ndw-q3-faq"/>
>+                                                    <menuItem title="Show Colors" keyEquivalent="C" id="bgn-CT-cEk">
>+                                                        <connections>
>+                                                            <action selector="orderFrontColorPanel:" target="Ady-hI-5gd" id="mSX-Xz-DV3"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="iMs-zA-UFJ"/>
>+                                                    <menuItem title="Copy Style" keyEquivalent="c" id="5Vv-lz-BsD">
>+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                                        <connections>
>+                                                            <action selector="copyFont:" target="Ady-hI-5gd" id="GJO-xA-L4q"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Paste Style" keyEquivalent="v" id="vKC-jM-MkH">
>+                                                        <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                                        <connections>
>+                                                            <action selector="pasteFont:" target="Ady-hI-5gd" id="JfD-CL-leO"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                        <menuItem title="Text" id="Fal-I4-PZk">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <menu key="submenu" title="Text" id="d9c-me-L2H">
>+                                                <items>
>+                                                    <menuItem title="Align Left" keyEquivalent="{" id="ZM1-6Q-yy1">
>+                                                        <connections>
>+                                                            <action selector="alignLeft:" target="Ady-hI-5gd" id="zUv-R1-uAa"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Center" keyEquivalent="|" id="VIY-Ag-zcb">
>+                                                        <connections>
>+                                                            <action selector="alignCenter:" target="Ady-hI-5gd" id="spX-mk-kcS"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Justify" id="J5U-5w-g23">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="alignJustified:" target="Ady-hI-5gd" id="ljL-7U-jND"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Align Right" keyEquivalent="}" id="wb2-vD-lq4">
>+                                                        <connections>
>+                                                            <action selector="alignRight:" target="Ady-hI-5gd" id="r48-bG-YeY"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="4s2-GY-VfK"/>
>+                                                    <menuItem title="Writing Direction" id="H1b-Si-o9J">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <menu key="submenu" title="Writing Direction" id="8mr-sm-Yjd">
>+                                                            <items>
>+                                                                <menuItem title="Paragraph" enabled="NO" id="ZvO-Gk-QUH">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
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>+                                        </menuItem>
>+                                        <menuItem title="Show Sidebar" keyEquivalent="s" id="kIP-vf-haE">
>+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
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>+                                                <action selector="toggleSourceList:" target="Ady-hI-5gd" id="iwa-gc-5KM"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Enter Full Screen" keyEquivalent="f" id="4J7-dP-txa">
>+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
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>+                                                <action selector="toggleFullScreen:" target="Ady-hI-5gd" id="dU3-MA-1Rq"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="Window" id="aUF-d1-5bR">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="Window" systemMenu="window" id="Td7-aD-5lo">
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>+                                            <connections>
>+                                                <action selector="performMiniaturize:" target="Ady-hI-5gd" id="VwT-WD-YPe"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Zoom" id="R4o-n2-Eq4">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="performZoom:" target="Ady-hI-5gd" id="DIl-cC-cCs"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="eu3-7i-yIM"/>
>+                                        <menuItem title="Bring All to Front" id="LE2-aR-0XJ">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="arrangeInFront:" target="Ady-hI-5gd" id="DRN-fu-gQh"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="Help" id="wpr-3q-Mcd">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="Help" systemMenu="help" id="F2S-fz-NVQ">
>+                                    <items>
>+                                        <menuItem title="WHLSL Tests Help" keyEquivalent="?" id="FKE-Sm-Kum">
>+                                            <connections>
>+                                                <action selector="showHelp:" target="Ady-hI-5gd" id="y7X-2Q-9no"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                        </items>
>+                    </menu>
>+                    <connections>
>+                        <outlet property="delegate" destination="Voe-Tx-rLC" id="PrD-fu-P6m"/>
>+                    </connections>
>+                </application>
>+                <customObject id="Voe-Tx-rLC" customClass="AppDelegate"/>
>+                <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
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>+            </objects>
>+            <point key="canvasLocation" x="75" y="0.0"/>
>+        </scene>
>+        
>+        <scene sceneID="R2V-B0-nI4">
>+            <objects>
>+                <windowController id="B8D-0N-5wS" sceneMemberID="viewController">
>+                    <window key="window" title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="IQv-IB-iLA">
>+                        <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
>+                        <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
>+                        <rect key="contentRect" x="196" y="240" width="480" height="270"/>
>+                        <rect key="screenRect" x="0.0" y="0.0" width="1680" height="1027"/>
>+                        <connections>
>+                            <outlet property="delegate" destination="B8D-0N-5wS" id="98r-iN-zZc"/>
>+                        </connections>
>+                    </window>
>+                    <connections>
>+                        <segue destination="XfG-lQ-9wD" kind="relationship" relationship="window.shadowedContentViewController" id="cq2-FE-JQM"/>
>+                    </connections>
>+                </windowController>
>+                <customObject id="Oky-zY-oP4" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
>+            </objects>
>+            <point key="canvasLocation" x="75" y="250"/>
>+        </scene>
>+        
>+        <scene sceneID="hIz-AP-VOD">
>+            <objects>
>+                <viewController id="XfG-lQ-9wD" customClass="ViewController" sceneMemberID="viewController">
>+                    <view key="view" wantsLayer="YES" id="m2S-Jp-Qdl">
>+                        <rect key="frame" x="0.0" y="0.0" width="1256" height="439"/>
>+                        <autoresizingMask key="autoresizingMask"/>
>+                        <subviews>
>+                            <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="zWA-us-Fkf">
>+                                <rect key="frame" x="14" y="13" width="90" height="32"/>
>+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
>+                                <buttonCell key="cell" type="push" title="Compile" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="1K5-PN-nLE">
>+                                    <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
>+                                    <font key="font" metaFont="system"/>
>+                                    <string key="keyEquivalent">r</string>
>+                                    <modifierMask key="keyEquivalentModifierMask" command="YES"/>
>+                                </buttonCell>
>+                                <connections>
>+                                    <action selector="compileClicked:" target="XfG-lQ-9wD" id="1FR-KE-nty"/>
>+                                </connections>
>+                            </button>
>+                            <scrollView fixedFrame="YES" borderType="none" horizontalLineScroll="10" horizontalPageScroll="10" verticalLineScroll="10" verticalPageScroll="10" hasHorizontalScroller="NO" translatesAutoresizingMaskIntoConstraints="NO" id="egF-8L-cI6">
>+                                <rect key="frame" x="20" y="61" width="400" height="358"/>
>+                                <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
>+                                <clipView key="contentView" ambiguous="YES" drawsBackground="NO" copiesOnScroll="NO" id="HW8-L7-3PX">
>+                                    <rect key="frame" x="0.0" y="0.0" width="400" height="358"/>
>+                                    <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
>+                                    <subviews>
>+                                        <textView ambiguous="YES" importsGraphics="NO" richText="NO" verticallyResizable="YES" findStyle="bar" smartInsertDelete="YES" id="pRP-9d-8nB">
>+                                            <rect key="frame" x="0.0" y="0.0" width="400" height="358"/>
>+                                            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
>+                                            <color key="textColor" name="textColor" catalog="System" colorSpace="catalog"/>
>+                                            <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
>+                                            <size key="minSize" width="400" height="358"/>
>+                                            <size key="maxSize" width="1317" height="10000000"/>
>+                                            <attributedString key="textStorage">
>+                                                <fragment content="WHLSLâ¨TextView">
>+                                                    <attributes>
>+                                                        <color key="NSColor" name="textColor" catalog="System" colorSpace="catalog"/>
>+                                                        <font key="NSFont" size="12" name="Menlo-Regular"/>
>+                                                        <paragraphStyle key="NSParagraphStyle" alignment="natural" lineBreakMode="wordWrapping" baseWritingDirection="natural" tighteningFactorForTruncation="0.0"/>
>+                                                    </attributes>
>+                                                </fragment>
>+                                            </attributedString>
>+                                            <color key="insertionPointColor" name="textColor" catalog="System" colorSpace="catalog"/>
>+                                        </textView>
>+                                    </subviews>
>+                                </clipView>
>+                                <scroller key="verticalScroller" wantsLayer="YES" verticalHuggingPriority="750" horizontal="NO" id="1T4-PL-dI4">
>+                                    <rect key="frame" x="384" y="0.0" width="16" height="358"/>
>+                                    <autoresizingMask key="autoresizingMask"/>
>+                                </scroller>
>+                            </scrollView>
>+                            <scrollView fixedFrame="YES" borderType="none" horizontalLineScroll="10" horizontalPageScroll="10" verticalLineScroll="10" verticalPageScroll="10" hasHorizontalScroller="NO" translatesAutoresizingMaskIntoConstraints="NO" id="tuu-uc-Dxg">
>+                                <rect key="frame" x="428" y="61" width="400" height="358"/>
>+                                <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMinY="YES" flexibleMaxY="YES"/>
>+                                <clipView key="contentView" ambiguous="YES" drawsBackground="NO" copiesOnScroll="NO" id="1Us-pH-zAs">
>+                                    <rect key="frame" x="0.0" y="0.0" width="400" height="358"/>
>+                                    <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
>+                                    <subviews>
>+                                        <textView ambiguous="YES" importsGraphics="NO" richText="NO" verticallyResizable="YES" findStyle="bar" smartInsertDelete="YES" id="82n-yv-OVo">
>+                                            <rect key="frame" x="0.0" y="0.0" width="400" height="358"/>
>+                                            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
>+                                            <color key="textColor" name="textColor" catalog="System" colorSpace="catalog"/>
>+                                            <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
>+                                            <size key="minSize" width="400" height="358"/>
>+                                            <size key="maxSize" width="1391" height="10000000"/>
>+                                            <color key="insertionPointColor" name="textColor" catalog="System" colorSpace="catalog"/>
>+                                        </textView>
>+                                    </subviews>
>+                                </clipView>
>+                                <scroller key="verticalScroller" wantsLayer="YES" verticalHuggingPriority="750" horizontal="NO" id="ev9-xr-MSP">
>+                                    <rect key="frame" x="384" y="0.0" width="16" height="358"/>
>+                                    <autoresizingMask key="autoresizingMask"/>
>+                                </scroller>
>+                            </scrollView>
>+                            <customView fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="9FG-iv-6pr" customClass="CustomMetalView">
>+                                <rect key="frame" x="836" y="61" width="400" height="358"/>
>+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
>+                            </customView>
>+                            <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="aSY-2r-vMu">
>+                                <rect key="frame" x="106" y="20" width="1132" height="18"/>
>+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
>+                                <textFieldCell key="cell" lineBreakMode="clipping" title="Label" id="JK0-3q-epW">
>+                                    <font key="font" metaFont="system"/>
>+                                    <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
>+                                    <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
>+                                </textFieldCell>
>+                            </textField>
>+                        </subviews>
>+                    </view>
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>+                        <outlet property="debugLabel" destination="aSY-2r-vMu" id="hSC-9N-nj9"/>
>+                        <outlet property="metalView" destination="9FG-iv-6pr" id="d1K-E7-8zL"/>
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>+                        <outlet property="whlslViewContainer" destination="egF-8L-cI6" id="DIG-j2-2tb"/>
>+                    </connections>
>+                </viewController>
>+                <customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
>+            </objects>
>+            <point key="canvasLocation" x="-332" y="911.5"/>
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>+    </scenes>
>+</document>
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..9f40750336f792b9c71b0bcd302ead62224af753
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.h	
>@@ -0,0 +1,24 @@
>+//
>+//  CompileResult.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/12/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface CompileResult : NSObject
>+
>+- (instancetype)initWithMetalSource:(NSString*)source functionNameMap:(NSDictionary<NSString*,NSArray<NSString*>*>*)map;
>+
>+@property (readonly) NSString *source;
>+@property (readonly) NSDictionary<NSString*, NSArray<NSString*>*>* functionNameMap;
>+
>+- (NSString*)defaultInstanceMethodForFunctionName:(NSString*)functionName;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..e7b16964fafb2be8b5573c6a0177873a8aa96198
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.m	
>@@ -0,0 +1,34 @@
>+//
>+//  CompileResult.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/12/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "CompileResult.h"
>+
>+@interface CompileResult ()
>+
>+@property NSString *source;
>+@property NSDictionary<NSString*, NSArray<NSString*>*>* functionNameMap;
>+
>+@end
>+
>+@implementation CompileResult
>+
>+- (instancetype)initWithMetalSource:(NSString *)source functionNameMap:(NSDictionary<NSString *, NSArray<NSString *> *> *)map
>+{
>+    if (self = [super init]) {
>+        self.source = source;
>+        self.functionNameMap = map;
>+    }
>+    return self;
>+}
>+
>+- (NSString*)defaultInstanceMethodForFunctionName:(NSString *)functionName
>+{
>+    return [self.functionNameMap[functionName] firstObject];
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..afec3a0a8e4f3289be99ff922a9c89320a0cfb45
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.h	
>@@ -0,0 +1,25 @@
>+//
>+//  Compiler.h
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+@import Foundation;
>+@import JavaScriptCore;
>+
>+#import "CompileResult.h"
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface Compiler : NSObject
>+
>+- (CompileResult*)compileWhlslToMetal:(NSString*)whlslSource error:(NSError**)error;
>+
>+- (void)lexWhlsl:(NSMutableAttributedString *)msl;
>+- (void)lexMsl:(NSMutableAttributedString*)msl;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..be3d2326bd2f263df9413f9d5badce73970a31a5
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.m	
>@@ -0,0 +1,130 @@
>+//
>+//  Compiler.m
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "Compiler.h"
>+
>+@import Cocoa;
>+@import JavaScriptCore;
>+
>+@interface Compiler ()
>+
>+@property JSContext* context;
>+
>+@end
>+
>+@implementation Compiler
>+
>+- (instancetype)init
>+{
>+    self = [super init];
>+    if (self) {
>+        self.context = [[JSContext alloc] init];
>+        [self loadScripts];
>+    }
>+    return self;
>+}
>+    
>+- (void)loadScripts
>+{
>+    __weak JSContext* weakContext = self.context;
>+    __block NSMutableSet<NSString*>* alreadyLoaded = [NSMutableSet new];
>+    void (^loadFunction)(NSString *) = ^void(NSString* name) {
>+        if (![alreadyLoaded containsObject:name]) {
>+            NSString* path = [[NSBundle mainBundle] pathForResource:[name stringByDeletingPathExtension] ofType:@"js"];
>+            NSError* loadError = nil;
>+            NSString* src = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&loadError];
>+            if (loadError)
>+                NSLog(@"Loading %@ failed: %@", name, loadError.localizedDescription);
>+            else {
>+                [weakContext evaluateScript:src];
>+                [alreadyLoaded addObject:name];
>+            }
>+        } else
>+            NSLog(@"Attempting to load duplicate file %@", name);
>+    };
>+    self.context[@"load"] = loadFunction;
>+    
>+    loadFunction(@"All.js");
>+    loadFunction(@"compiler.js");
>+}
>+
>+- (CompileResult*)compileWhlslToMetal:(NSString *)whlslSource error:(NSError * _Nullable __autoreleasing *)error
>+{
>+    JSValue *compileFunction = [self.context objectForKeyedSubscript:@"whlslToMsl"];
>+    if (compileFunction) {
>+        JSValue * result = [compileFunction callWithArguments:@[whlslSource]];
>+        if (result) {
>+            if ([result hasProperty:@"_error"] && [result hasProperty:@"_metalShaderLanguageSource"] && [result hasProperty:@"_originalFunctionNameToMangledNames"]) {
>+                if ([[result valueForProperty:@"_error"] isNull]) {
>+                    NSString *src = [[result valueForProperty:@"_metalShaderLanguageSource"] toString];
>+                    NSDictionary *map = [[result valueForProperty:@"_originalFunctionNameToMangledNames"] toDictionary];
>+                    return [[CompileResult alloc] initWithMetalSource:src functionNameMap:map];
>+                }
>+
>+                *error = [NSError errorWithDomain:@"WhlslCompiler" code:1 userInfo:@{ NSLocalizedDescriptionKey: [[result valueForProperty:@"_error"] toString]}];
>+                return nil;
>+            }
>+
>+            *error = [NSError errorWithDomain:@"WHLSL Compiler" code:2 userInfo:@{ NSLocalizedDescriptionKey: @"Keys not present in result" }];
>+            return nil;
>+        }
>+
>+        *error = [NSError errorWithDomain:@"WhlslCompiler" code:3 userInfo:@{ NSLocalizedDescriptionKey: @"Compilation failed" }];
>+        return nil;
>+
>+    }
>+       
>+    *error = [NSError errorWithDomain:@"WhlslCompiler" code:4 userInfo:@{ NSLocalizedDescriptionKey: @"Didn't find compilation function" }];
>+    return nil;
>+}
>+
>+- (void)lexWhlsl:(NSMutableAttributedString *)whlsl
>+{
>+    [self applyStyleInformationWithFunction:@"lexWHLSL" toAttributedString:whlsl];
>+}
>+
>+- (void)lexMsl:(NSMutableAttributedString *)msl
>+{
>+    [self applyStyleInformationWithFunction:@"lexMsl" toAttributedString:msl];
>+}
>+
>+- (void)applyStyleInformationWithFunction:(NSString*)functionName toAttributedString:(NSMutableAttributedString*)attrString
>+{
>+    if (!attrString)
>+        return;
>+    
>+    JSValue *lexFunction = [self.context objectForKeyedSubscript:functionName];
>+    if (lexFunction) {
>+        JSValue *result = [lexFunction callWithArguments:@[ attrString.string ]];
>+        if (result) {
>+            [attrString setAttributes:@{} range:NSMakeRange(0, attrString.length)];
>+            
>+            for (NSDictionary* value in result.toArray) {
>+                NSUInteger startIndex = [(NSNumber*)[value objectForKeyedSubscript:@"_startIndex"] unsignedIntegerValue];
>+                NSUInteger length = [(NSString*)[value objectForKeyedSubscript:@"_src"] length];
>+                NSRange range = NSMakeRange(startIndex, length);
>+                NSString *style = [value objectForKeyedSubscript:@"_type"];
>+                
>+                if ([style isEqualToString:@"comment"])
>+                    [attrString setAttributes:@{ NSForegroundColorAttributeName: [NSColor colorWithWhite:158.0 / 255 alpha:1], NSFontAttributeName: [NSFont fontWithName:@"Menlo" size:24] } range:range];
>+                else if ([style isEqualToString:@"directive"])
>+                    [attrString setAttributes:@{ NSForegroundColorAttributeName: [NSColor colorWithDeviceRed:252.0 / 255 green:143.0 / 255 blue:63.0 / 255 alpha:1], NSFontAttributeName: [NSFont fontWithName:@"Menlo" size:24] } range:range];
>+                else if ([style isEqualToString:@"literal"])
>+                    [attrString setAttributes:@{ NSForegroundColorAttributeName: [NSColor colorWithDeviceRed:150.0 / 255 green:134.0 / 255 blue:245.0 / 255 alpha:1], NSFontAttributeName: [NSFont fontWithName:@"Menlo" size:24]} range:range];
>+                else if ([style isEqualToString:@"type"] || [style isEqualToString:@"keyword"])
>+                    [attrString setAttributes:@{ NSForegroundColorAttributeName: [NSColor colorWithDeviceRed:253.0 / 255 green:95.0 / 255 blue:162.0 / 255 alpha:1], NSFontAttributeName: [NSFont fontWithName:@"Menlo" size:24]} range:range];
>+                else
>+                    [attrString setAttributes:@{ NSForegroundColorAttributeName: [NSColor whiteColor], NSFontAttributeName: [NSFont fontWithName:@"Menlo" size:24] } range:range];
>+            }
>+        } else
>+            NSLog(@"Lexing failed");
>+    } else
>+        NSLog(@"No lex function");
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..25771b57e3bcc24b3aa6853bab86d1551004c4f5
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.h	
>@@ -0,0 +1,28 @@
>+//
>+//  CustomMetalView.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+#import <MetalKit/MetalKit.h>
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@class CustomMetalView;
>+
>+@protocol CustomMetalViewDelegate <NSObject>
>+
>+- (void)customMetalView:(CustomMetalView*)metalView scrolledDeltaX:(CGFloat)deltaX deltaY:(CGFloat)deltaY;
>+
>+@end
>+
>+@interface CustomMetalView : MTKView
>+
>+@property id<CustomMetalViewDelegate> scrollDelegate;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..9bf02a5b1514e6e3f3a74f0d1984539b21a04f47
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CustomMetalView.m	
>@@ -0,0 +1,18 @@
>+//
>+//  CustomMetalView.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "CustomMetalView.h"
>+
>+@implementation CustomMetalView
>+
>+- (void)scrollWheel:(NSEvent *)event
>+{
>+    [self.scrollDelegate customMetalView:self scrolledDeltaX:event.deltaX deltaY:event.deltaY];
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Default.whlsl b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Default.whlsl
>new file mode 100644
>index 0000000000000000000000000000000000000000..c413c66dcb45e4235aa5b8613390409c62d131ee
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Default.whlsl	
>@@ -0,0 +1,24 @@
>+struct VertexInput {
>+    float2 position;
>+    float2 uv;
>+}
>+
>+struct VertexOutput {
>+    float4 wsl_Position;
>+}
>+
>+struct FragmentOutput {
>+    float4 wsl_Color;
>+}
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput) {
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    return result;
>+}
>+
>+fragment FragmentOutput fragmentShader(VertexOutput stageIn) {
>+    FragmentOutput result;
>+    result.wsl_Color = float4(0.0, 1.0, 0.0, 1.0);
>+    return result;
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Julia.whlsl b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Julia.whlsl
>new file mode 100644
>index 0000000000000000000000000000000000000000..54bee30748181d2db81b52f0c1f2fd72b2925577
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Julia.whlsl	
>@@ -0,0 +1,103 @@
>+struct VertexInput {
>+    float2 position;
>+    float2 uv;
>+}
>+
>+struct VertexOutput {
>+    float4 wsl_Position;
>+    float2 uv;
>+}
>+
>+struct FragmentOutput {
>+    float4 wsl_Color;
>+}
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput) {
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    result.uv = vertexInput.uv;
>+    return result;
>+}
>+
>+fragment FragmentOutput fragmentShader(VertexOutput stageIn) {
>+    FragmentOutput result;
>+    float m = julia(stageIn.uv);
>+    float3 hot = float3(1, 1, 1);
>+    float3 cold = float3(0, 1, 0.1);
>+    float3 res = interpolate(cold, hot, m);
>+    res = hslToRgb(res);
>+    result.wsl_Color = float4(res, 1);
>+    return result;
>+}
>+
>+float3 interpolate(float3 x, float3 y, float z)
>+{
>+    float3 res;
>+    res.x = x.x + (y.x - x.x) * z;
>+    res.y = x.y + (y.y - x.y) * z;
>+    res.z = x.z + (y.z - x.z) * z;
>+    return res;
>+}
>+
>+float hueToRgb(float p, float q, float t)
>+{
>+if(t < 0.0) t += 1.0;
>+            if(t > 1.0) t -= 1.0;
>+            if(t < 1.0/6.0) return p + (q - p) * 6.0 * t;
>+            if(t < 1.0/2.0) return q;
>+            if(t < 2.0/3.0) return p + (q - p) * (2.0/3.0 - t) * 6.0;
>+            return p;
>+}
>+
>+float3 hslToRgb(float3 hsl)
>+{
>+    float3 rgb;
>+    float h = hsl.x;
>+    float s = hsl.y;
>+    float l = hsl.z;
>+    if(s == 0){
>+        rgb = float3(l, l, l);
>+    } else {
>+        float q;
>+        if (l < 0.5) { q = l * (1.0 + s); } else { q = l + s - l * s; }
>+        float p = 2.0 * l - q;
>+        rgb.x = hueToRgb(p, q, h + 1.0/3.0);
>+        rgb.y = hueToRgb(p, q, h);
>+        rgb.z = hueToRgb(p, q, h - 1.0/3.0);
>+    }
>+
>+    return rgb;
>+
>+}
>+
>+float julia(float2 uv)
>+{
>+    float n = 2.0f;
>+    float2 z;
>+    float2 c;
>+    float2 scale = float2(2, 2.9);
>+    float2 center = float2(0.7, 0);
>+    int iter = 100;
>+    c.x = 1.3333 * (uv.x - 0.5) * scale.x - center.x;
>+    c.y = (uv.y - 0.5) * scale.y - center.y;
>+    z = c;
>+    int i;
>+    for (i = 0; i < iter; i++) {
>+        float x = pow(z.x * z.x + z.y * z.y, n / 2.0) * cos(n * atan2(z.y, z.x)) + c.x;
>+        float y = pow(z.x * z.x + z.y * z.y, n / 2.0) * sin(n * atan2(z.y, z.x)) + c.y;
>+
>+        if(pow(x, 2.0f) + pow(y, 2.0f) > 16.0f) break;
>+        z.x = x;
>+        z.y = y;
>+    }
>+    float res;
>+    if (i < iter) {
>+        float log_zn = log( z.x*z.x + z.y*z.y ) / 2.0f;
>+        float nu = log( log_zn / log(n) ) / log(2.0f);
>+        res = (float(i) + 1 - nu) / float(iter);
>+    } else {
>+       res = 1;
>+    }
>+    return res;
>+}
>+			
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Mandelbrot.whlsl b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Mandelbrot.whlsl
>new file mode 100644
>index 0000000000000000000000000000000000000000..521f0ced4060597803d0f867e6cc0d7729b4e91a
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Mandelbrot.whlsl	
>@@ -0,0 +1,98 @@
>+struct VertexInput {
>+    float2 position;
>+    float2 uv;
>+}
>+
>+struct VertexOutput {
>+    float4 wsl_Position;
>+    float2 uv;
>+}
>+
>+struct FragmentOutput {
>+    float4 wsl_Color;
>+}
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput) {
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    result.uv = vertexInput.uv;
>+    return result;
>+}
>+
>+fragment FragmentOutput fragmentShader(VertexOutput stageIn) {
>+    FragmentOutput result;
>+    float m = mandelbrot(stageIn.uv);
>+    float3 hot = float3(1, 1, 1);
>+    float3 cold = float3(0, 1, 0.1);
>+    float3 res = interpolate(cold, hot, m);
>+    res = hslToRgb(res);
>+    result.wsl_Color = float4(res, 1);
>+    return result;
>+}
>+
>+float3 interpolate(float3 x, float3 y, float z)
>+{
>+    float3 res;
>+    res.x = x.x + (y.x - x.x) * z;
>+    res.y = x.y + (y.y - x.y) * z;
>+    res.z = x.z + (y.z - x.z) * z;
>+    return res;
>+}
>+
>+float hueToRgb(float p, float q, float t)
>+{
>+    if(t < 0.0) t += 1.0;
>+    if(t > 1.0) t -= 1.0;
>+    if(t < 1.0/6.0) return p + (q - p) * 6.0 * t;
>+    if(t < 1.0/2.0) return q;
>+    if(t < 2.0/3.0) return p + (q - p) * (2.0/3.0 - t) * 6.0;
>+    return p;
>+}
>+
>+float3 hslToRgb(float3 hsl)
>+{
>+    float3 rgb;
>+    float h = hsl.x;
>+    float s = hsl.y;
>+    float l = hsl.z;
>+    if(s == 0){
>+        rgb = float3(l, l, l);
>+    } else {
>+        float q;
>+        if (l < 0.5) { q = l * (1.0 + s); } else { q = l + s - l * s; }
>+        float p = 2.0 * l - q;
>+        rgb.x = hueToRgb(p, q, h + 1.0/3.0);
>+        rgb.y = hueToRgb(p, q, h);
>+        rgb.z = hueToRgb(p, q, h - 1.0/3.0);
>+    }
>+
>+    return rgb;
>+}
>+
>+float mandelbrot(float2 uv)
>+{
>+    float2 z;
>+    float2 c = uv;
>+    int iter = 100;
>+    z = c;
>+    int i;
>+    for (i = 0; i < iter; i++) {
>+        float x = (z.x * z.x - z.y * z.y) + c.x;
>+        float y = (z.y * z.x + z.x * z.y) + c.y;
>+
>+        if(pow(x, 2.0f) + pow(y, 2.0f) > 256.0) break;
>+        z.x = x;
>+        z.y = y;
>+    }
>+    float res;
>+    if (i < iter) {
>+        float log_zn = log( z.x*z.x + z.y*z.y ) / 2;
>+        float nu = log( log_zn / log(2.0f) ) / log(2.0f);
>+        res = (float(i) + 1 - nu) / float(iter);
>+    } else {
>+        res = 1;
>+    }
>+return res;
>+}
>+
>+
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Info.plist b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Info.plist
>new file mode 100644
>index 0000000000000000000000000000000000000000..01857f52dab33c6e0e0c3c3f28da60461a07a57e
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Info.plist	
>@@ -0,0 +1,32 @@
>+<?xml version="1.0" encoding="UTF-8"?>
>+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
>+<plist version="1.0">
>+<dict>
>+	<key>CFBundleDevelopmentRegion</key>
>+	<string>$(DEVELOPMENT_LANGUAGE)</string>
>+	<key>CFBundleExecutable</key>
>+	<string>$(EXECUTABLE_NAME)</string>
>+	<key>CFBundleIconFile</key>
>+	<string></string>
>+	<key>CFBundleIdentifier</key>
>+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
>+	<key>CFBundleInfoDictionaryVersion</key>
>+	<string>6.0</string>
>+	<key>CFBundleName</key>
>+	<string>$(PRODUCT_NAME)</string>
>+	<key>CFBundlePackageType</key>
>+	<string>APPL</string>
>+	<key>CFBundleShortVersionString</key>
>+	<string>1.0</string>
>+	<key>CFBundleVersion</key>
>+	<string>1</string>
>+	<key>LSMinimumSystemVersion</key>
>+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
>+	<key>NSHumanReadableCopyright</key>
>+	<string>Copyright Â© 2018 Apple, Inc. All rights reserved.</string>
>+	<key>NSMainStoryboardFile</key>
>+	<string>Main</string>
>+	<key>NSPrincipalClass</key>
>+	<string>NSApplication</string>
>+</dict>
>+</plist>
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Metal equivalents/Shaders.metal b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Metal equivalents/Shaders.metal
>new file mode 100644
>index 0000000000000000000000000000000000000000..111c34b0fce9e72989632bd68f46afbf9fc39da2
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Metal equivalents/Shaders.metal	
>@@ -0,0 +1,179 @@
>+//
>+//  FlatColor.metal
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+// This file is a hand-modified version of the WHLSL compiler output
>+
>+#include <metal_stdlib>
>+using namespace metal;
>+
>+struct VertexOutput {
>+    float4 position [[position]];
>+    float2 uv;
>+};
>+
>+struct VertexInput {
>+    float2 position [[attribute(0)]];
>+    float2 uv [[attribute(1)]];
>+};
>+
>+struct FragmentOutput {
>+    float4 color [[color(0)]];
>+};
>+
>+vertex VertexOutput flatColorVertexShader(VertexInput in [[stage_in]])
>+{
>+    VertexOutput out;
>+    out.position = float4(in.position, 0, 1);
>+    return out;
>+}
>+
>+fragment FragmentOutput flatColorFragmentShader(VertexOutput in [[stage_in]])
>+{
>+    FragmentOutput out;
>+    out.color = float4(0, 1, 0, 1);
>+    return out;
>+}
>+
>+float3 interpolate(float3 x, float3 y, float z);
>+float hueToRgb(float p, float q, float t);
>+float3 hslToRgb(float3 hsl);
>+float mandelbrot(float2 uv);
>+
>+vertex VertexOutput mandelbrotVertexShader(VertexInput vertexInput [[stage_in]]) {
>+    VertexOutput result;
>+    result.position = float4(vertexInput.position, 0., 1.);
>+    result.uv = vertexInput.uv;
>+    return result;
>+}
>+
>+fragment FragmentOutput mandelbrotFragmentShader(VertexOutput stageIn [[stage_in]]) {
>+    FragmentOutput result;
>+    const float m = mandelbrot(stageIn.uv);
>+    const float3 hot = float3(1, 1, 1);
>+    const float3 cold = float3(0, 1, 0.1);
>+    const float3 res = hslToRgb(interpolate(cold, hot, m));
>+    result.color = float4(res, 1);
>+    return result;
>+}
>+
>+float3 interpolate(float3 x, float3 y, float z)
>+{
>+    float3 res;
>+    res.x = x.x + (y.x - x.x) * z;
>+    res.y = x.y + (y.y - x.y) * z;
>+    res.z = x.z + (y.z - x.z) * z;
>+    return res;
>+}
>+
>+float hueToRgb(float p, float q, float t)
>+{
>+    if(t < 0.0) t += 1.0;
>+    if(t > 1.0) t -= 1.0;
>+    if(t < 1.0/6.0) return p + (q - p) * 6.0 * t;
>+    if(t < 1.0/2.0) return q;
>+    if(t < 2.0/3.0) return p + (q - p) * (2.0/3.0 - t) * 6.0;
>+    return p;
>+}
>+
>+float3 hslToRgb(float3 hsl)
>+{
>+    float3 rgb;
>+    float h = hsl.x;
>+    float s = hsl.y;
>+    float l = hsl.z;
>+    if(s == 0){
>+        rgb = float3(l, l, l);
>+    } else {
>+        float q;
>+        if (l < 0.5) { q = l * (1.0 + s); } else { q = l + s - l * s; }
>+        float p = 2.0 * l - q;
>+        rgb.x = hueToRgb(p, q, h + 1.0/3.0);
>+        rgb.y = hueToRgb(p, q, h);
>+        rgb.z = hueToRgb(p, q, h - 1.0/3.0);
>+    }
>+    
>+    return rgb;
>+}
>+
>+float mandelbrot(float2 uv)
>+{
>+    float2 z;
>+    float2 c = uv;
>+    int iter = 100;
>+    z = c;
>+    int i;
>+    for (i = 0; i < iter; i++) {
>+        float x = (z.x * z.x - z.y * z.y) + c.x;
>+        float y = (z.y * z.x + z.x * z.y) + c.y;
>+        
>+        if(pow(x, 2.0f) + pow(y, 2.0f) > 256.0) break;
>+        z.x = x;
>+        z.y = y;
>+    }
>+    float res;
>+    if (i < iter) {
>+        float log_zn = log( z.x*z.x + z.y*z.y ) / 2;
>+        float nu = log( log_zn / log(2.0f) ) / log(2.0f);
>+        res = (float(i) + 1 - nu) / float(iter);
>+    } else {
>+        res = 1;
>+    }
>+    return res;
>+}
>+
>+float julia(float2 uv);
>+
>+vertex VertexOutput juliaVertexShader(VertexInput vertexInput [[stage_in]]) {
>+    VertexOutput result;
>+    result.position = float4(vertexInput.position, 0., 1.);
>+    result.uv = vertexInput.uv;
>+    return result;
>+}
>+
>+fragment FragmentOutput juliaFragmentShader(VertexOutput stageIn [[stage_in]]) {
>+    FragmentOutput result;
>+    float m = julia(stageIn.uv);
>+    float3 hot = float3(1, 1, 1);
>+    float3 cold = float3(0, 1, 0.1);
>+    float3 res = interpolate(cold, hot, m);
>+    res = hslToRgb(res);
>+    result.color = float4(res, 1);
>+    return result;
>+}
>+
>+float julia(float2 uv)
>+{
>+    float n = 2.0f;
>+    float2 z;
>+    float2 c;
>+    float2 scale = float2(2, 2.9);
>+    float2 center = float2(0.7, 0);
>+    int iter = 100;
>+    c.x = 1.3333 * (uv.x - 0.5) * scale.x - center.x;
>+    c.y = (uv.y - 0.5) * scale.y - center.y;
>+    z = c;
>+    int i;
>+    for (i = 0; i < iter; i++) {
>+        float x = pow(z.x * z.x + z.y * z.y, n / 2.0) * cos(n * atan2(z.y, z.x)) + c.x;
>+        float y = pow(z.x * z.x + z.y * z.y, n / 2.0) * sin(n * atan2(z.y, z.x)) + c.y;
>+        
>+        if(pow(x, 2.0f) + pow(y, 2.0f) > 16.0f) break;
>+        z.x = x;
>+        z.y = y;
>+    }
>+    float res;
>+    if (i < iter) {
>+        float log_zn = log( z.x*z.x + z.y*z.y ) / 2.0f;
>+        float nu = log( log_zn / log(n) ) / log(2.0f);
>+        res = (float(i) + 1 - nu) / float(iter);
>+    } else {
>+        res = 1;
>+    }
>+    return res;
>+}
>+
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..54e4e08d3897fdca7a34ffeecd3f02b8bbd43629
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.h	
>@@ -0,0 +1,26 @@
>+//
>+//  OffscreenRenderer.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/11/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "Renderer.h"
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface OffscreenRenderer : Renderer
>+
>+@property MTLPixelFormat outputPixelFormat;
>+
>+- (void)setLibrary:(id<MTLLibrary>)library vertexShaderName:(NSString*)vertexShader fragmentShaderName:(NSString*)fragmentShaderName;
>+- (void)readTextureDataToBuffer:(uint8_t*)buffer bytesPerRow:(NSUInteger)bytesPerRow;
>+
>+- (int)intValue;
>+- (unsigned int)uintValue;
>+- (float)floatValue;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..9b7aa29e7d53e3c578683b4a0992a30533cfa06c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.m	
>@@ -0,0 +1,92 @@
>+//
>+//  OffscreenRenderer.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/11/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "OffscreenRenderer.h"
>+
>+@interface OffscreenRenderer ()
>+{
>+    id<MTLTexture> _outputTexture;
>+}
>+
>+@end
>+
>+@implementation OffscreenRenderer
>+
>+- (void)setLibrary:(id<MTLLibrary>)library vertexShaderName:(NSString*)vertexShader fragmentShaderName:(NSString*)fragmentShaderName
>+{
>+    [super setLibrary:library vertexShaderName:vertexShader fragmentShaderName:fragmentShaderName pixelFormat:self.outputPixelFormat];
>+}
>+
>+- (void)setTargetWidth:(NSUInteger)width setTargetHeight:(NSUInteger)height
>+{
>+    [super setTargetWidth:width setTargetHeight:height];
>+    MTLTextureDescriptor *outputDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:self.outputPixelFormat width:self.targetWidth height:self.targetHeight mipmapped:NO];
>+    outputDescriptor.usage = MTLTextureUsageRenderTarget;
>+    outputDescriptor.storageMode = MTLStorageModeManaged;
>+    _outputTexture = [self.device newTextureWithDescriptor:outputDescriptor];
>+}
>+
>+- (MTLRenderPassDescriptor*)renderPassDescriptor
>+{
>+    MTLRenderPassDescriptor *renderPassDescriptor = [MTLRenderPassDescriptor renderPassDescriptor];
>+
>+    renderPassDescriptor.colorAttachments[0].texture = _outputTexture;
>+    renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 0);
>+    renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
>+    renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
>+    
>+    return renderPassDescriptor;
>+}
>+
>+- (void)configureCommandBufferBeforeCommit:(id<MTLCommandBuffer>)commandBuffer
>+{
>+    id <MTLBlitCommandEncoder> blitEncoder = [commandBuffer blitCommandEncoder];
>+    [blitEncoder synchronizeResource:_outputTexture];
>+    [blitEncoder endEncoding];
>+}
>+
>+- (void)readTextureDataToBuffer:(uint8_t *)buffer bytesPerRow:(NSUInteger)bytesPerRow
>+{
>+    // The texture isn't mipmapped, so we use the default level of 0
>+    [_outputTexture getBytes:buffer bytesPerRow:bytesPerRow fromRegion:MTLRegionMake2D(0, 0, self.targetWidth, self.targetHeight) mipmapLevel:0];
>+}
>+
>+- (int)intValue
>+{
>+    // We always have 4 bytes per pixel
>+    NSUInteger length = self.targetWidth * self.targetHeight * 4;
>+    uint8_t *buffer = calloc(length, sizeof(uint8_t));
>+    [self readTextureDataToBuffer:(uint8_t*)buffer bytesPerRow:4 * self.targetWidth];
>+    int intValue = ((int*)buffer)[0];
>+    free(buffer);
>+    return intValue;
>+}
>+
>+- (unsigned int)uintValue
>+{
>+    // We always have 4 bytes per pixel
>+    NSUInteger length = self.targetWidth * self.targetHeight * 4;
>+    uint8_t *buffer = calloc(length, sizeof(uint8_t));
>+    [self readTextureDataToBuffer:(uint8_t*)buffer bytesPerRow:4 * self.targetWidth];
>+    unsigned int uintValue = ((unsigned int*)buffer)[0];
>+    free(buffer);
>+    return uintValue;
>+}
>+
>+- (float)floatValue
>+{
>+    // We always have 4 bytes per pixel
>+    NSUInteger length = self.targetWidth * self.targetHeight * 4;
>+    uint8_t *buffer = calloc(length, sizeof(uint8_t));
>+    [self readTextureDataToBuffer:(uint8_t*)buffer bytesPerRow:4 * self.targetWidth];
>+    float floatValue = ((float*)buffer)[0];
>+    free(buffer);
>+    return floatValue;
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ae6bd5f266823a2abad6b6aff117806f2e6b5ee5
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.h	
>@@ -0,0 +1,25 @@
>+//
>+//  Renderer.h
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+
>+#import "Renderer.h"
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface OnscreenRenderer : Renderer<MTKViewDelegate>
>+
>+- (instancetype)initWithView:(MTKView*)view;
>+
>+@property (readonly) MTKView *view;
>+
>+- (void)setShaderSource:(NSString*)source vertexShaderName:(NSString*)vertexShader fragmentShaderName:(NSString*)fragmentShader;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..963b61658173beb29403d9fe627c4ad1d38e3cb2
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OnscreenRenderer.m	
>@@ -0,0 +1,65 @@
>+//
>+//  Renderer.m
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "OnscreenRenderer.h"
>+
>+#import <simd/simd.h>
>+
>+@interface OnscreenRenderer ()
>+
>+@property MTKView *view;
>+@property CGSize drawableSize;
>+
>+@end
>+
>+@implementation OnscreenRenderer
>+
>+- (instancetype)initWithView:(MTKView *)view
>+{
>+    self = [super init];
>+    if (self) {
>+        self.view = view;
>+        self.view.delegate = self;
>+    }
>+    return self;
>+}
>+
>+- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size
>+{
>+    [self setTargetWidth:size.width setTargetHeight:size.height];
>+}
>+
>+- (void)drawInMTKView:(MTKView *)view
>+{
>+    [self draw];
>+}
>+
>+- (MTLRenderPassDescriptor*)renderPassDescriptor
>+{
>+    return self.view.currentRenderPassDescriptor;
>+}
>+
>+- (void)configureCommandBufferBeforeCommit:(id<MTLCommandBuffer>)commandBuffer
>+{
>+    [commandBuffer presentDrawable:self.view.currentDrawable];
>+}
>+
>+- (void)setShaderSource:(NSString *)source vertexShaderName:(NSString *)vertexShaderName fragmentShaderName:(NSString *)fragmentShaderName
>+{
>+    MTLCompileOptions *compileOptions = [[MTLCompileOptions alloc] init];
>+    NSError *error = nil;
>+    id<MTLLibrary> library = [self.device newLibraryWithSource:source options:compileOptions error:&error];
>+    if (error) {
>+        NSLog(@"Compile error: %@", error.localizedDescription);
>+        return;
>+    }
>+    
>+    [self setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName pixelFormat:self.view.colorPixelFormat];
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..d1d4407729e74e1ea2caa165b13a428624b6dfa3
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.h	
>@@ -0,0 +1,35 @@
>+//
>+//  Renderer.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/11/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+#import <MetalKit/MetalKit.h>
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface Renderer : NSObject
>+
>+@property (nonatomic) simd_float3x3 transformMatrix;
>+
>+@property (readonly) id<MTLDevice> device;
>+
>+@property (readonly) NSUInteger targetWidth;
>+@property (readonly) NSUInteger targetHeight;
>+
>+- (void)setTargetWidth:(NSUInteger)width setTargetHeight:(NSUInteger)height;
>+
>+- (void)setLibrary:(id<MTLLibrary>)library vertexShaderName:(NSString*)vertexShader fragmentShaderName:(NSString*)fragmentShaderName pixelFormat:(MTLPixelFormat)pixelFormat;
>+
>+- (void)draw;
>+
>+// Methods that can be overloaded to configure the render pipeline
>+- (MTLRenderPassDescriptor*)renderPassDescriptor;
>+- (void)configureCommandBufferBeforeCommit:(id<MTLCommandBuffer>)commandBuffer;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..9db7d4b990dd7ff0bb0f946a4a0df575f646a134
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.m	
>@@ -0,0 +1,155 @@
>+//
>+//  Renderer.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 7/11/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "Renderer.h"
>+
>+// This should mirror the structure that is used for the vertex shaders
>+typedef struct {
>+    vector_float2 position;
>+    vector_float2 uv;
>+} VertexStruct;
>+
>+// A quad that fills the viewport
>+static VertexStruct vertexData[] =
>+{
>+    // 2D positions
>+    { { -1.0,  -1.0 }, { 0, 0 } },
>+    { {  1.0,  -1.0 }, { 1, 0 } },
>+    { { -1.0, 1.0 }, { 0, 1 } },
>+    { {  1.0, 1.0 }, { 1, 1 } }
>+};
>+
>+@interface Renderer ()
>+
>+@property id<MTLDevice> device;
>+@property NSUInteger targetWidth;
>+@property NSUInteger targetHeight;
>+
>+@end
>+
>+@implementation Renderer {
>+    id<MTLCommandQueue> _commandQueue;
>+    id<MTLLibrary> _library;
>+    
>+    MTLRenderPipelineDescriptor *_pipelineStateDescriptor;
>+    
>+    id<MTLRenderPipelineState> _pipelineState;
>+}
>+
>+- (instancetype)init
>+{
>+    self = [super init];
>+    if (self) {
>+        _device = MTLCreateSystemDefaultDevice();
>+        _commandQueue = [_device newCommandQueue];
>+        self.transformMatrix = matrix_identity_float3x3;
>+    }
>+    return self;
>+}
>+
>+- (void)setLibrary:(id<MTLLibrary>)library vertexShaderName:(NSString*)vertexShaderName fragmentShaderName:(NSString*)fragmentShaderName pixelFormat:(MTLPixelFormat)pixelFormat
>+{
>+    _library = library;
>+    id<MTLFunction> vertexFunction = [_library newFunctionWithName:vertexShaderName];
>+    id<MTLFunction> fragmentFunction = [_library newFunctionWithName:fragmentShaderName];
>+    
>+    // Configure a pipeline descriptor that is used to create a pipeline state
>+    _pipelineStateDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
>+    
>+    MTLVertexDescriptor *vertexDescriptor = [MTLVertexDescriptor vertexDescriptor];
>+    vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2;
>+    vertexDescriptor.attributes[0].bufferIndex = 0;
>+    vertexDescriptor.attributes[0].offset = 0;
>+    
>+    vertexDescriptor.attributes[1].format = MTLVertexFormatFloat2;
>+    vertexDescriptor.attributes[1].bufferIndex = 0;
>+    vertexDescriptor.attributes[1].offset = offsetof(VertexStruct, uv);
>+    
>+    vertexDescriptor.layouts[0].stride = sizeof(VertexStruct);
>+    vertexDescriptor.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
>+    
>+    _pipelineStateDescriptor.vertexDescriptor = vertexDescriptor;
>+    
>+    _pipelineStateDescriptor.label = @"Simple Pipeline";
>+    _pipelineStateDescriptor.vertexFunction = vertexFunction;
>+    _pipelineStateDescriptor.fragmentFunction = fragmentFunction;
>+    _pipelineStateDescriptor.colorAttachments[0].pixelFormat = pixelFormat;
>+    
>+    NSError *error = nil;
>+    _pipelineState = [_device newRenderPipelineStateWithDescriptor:_pipelineStateDescriptor error:&error];
>+    
>+    NSAssert(_pipelineState, @"Failed to created pipeline state: %@", error.localizedDescription);
>+}
>+
>+- (void)setTargetWidth:(NSUInteger)width setTargetHeight:(NSUInteger)height
>+{
>+    _targetWidth = width;
>+    _targetHeight = height;
>+}
>+
>+- (void)draw
>+{
>+    if (!_pipelineState)
>+        return;
>+    
>+    // Create a new command buffer for each render pass to the current drawable
>+    id<MTLCommandBuffer> commandBuffer = [_commandQueue commandBuffer];
>+    commandBuffer.label = @"MyCommand";
>+    
>+    MTLRenderPassDescriptor *renderPassDescriptor = [self renderPassDescriptor];
>+    
>+    NSAssert(renderPassDescriptor, @"nil MTLRenderPassDescriptor");
>+    
>+    renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(1, 1, 1, 1);
>+    renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
>+    renderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore;
>+    
>+    // Create a render command encoder so we can render into something
>+    id<MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
>+    renderEncoder.label = @"MyRenderEncoder";
>+    
>+    [renderEncoder setViewport:(MTLViewport) { 0.0, 0.0, _targetWidth, _targetHeight, -1.0, 1.0 }];
>+    
>+    [renderEncoder setRenderPipelineState:_pipelineState];
>+    
>+    [renderEncoder setVertexBytes:vertexData length:sizeof(vertexData) atIndex:0];
>+    
>+    [renderEncoder drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
>+    
>+    [renderEncoder endEncoding];
>+    
>+    [self configureCommandBufferBeforeCommit:commandBuffer];
>+    
>+    [commandBuffer commit];
>+    [commandBuffer waitUntilCompleted];
>+}
>+
>+- (void)setTransformMatrix:(simd_float3x3)transformMatrix
>+{
>+    _transformMatrix = transformMatrix;
>+    simd_float3 v0 = matrix_multiply(_transformMatrix, vector3(0.0f, 0.0f, 1.0f));
>+    simd_float3 v1 = matrix_multiply(_transformMatrix, vector3(1.0f, 0.0f, 1.0f));
>+    simd_float3 v2 = matrix_multiply(_transformMatrix, vector3(0.0f, 1.0f, 1.0f));
>+    simd_float3 v3 = matrix_multiply(_transformMatrix, vector3(1.0f, 1.0f, 1.0f));
>+    
>+    vertexData[0].uv = vector2(v0.x, v0.y);
>+    vertexData[1].uv = vector2(v1.x, v1.y);
>+    vertexData[2].uv = vector2(v2.x, v2.y);
>+    vertexData[3].uv = vector2(v3.x, v3.y);
>+}
>+
>+- (MTLRenderPassDescriptor *)renderPassDescriptor
>+{
>+    return nil;
>+}
>+
>+- (void)configureCommandBufferBeforeCommit:(id<MTLCommandBuffer>)commandBuffer
>+{
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..ab5b40791454248485561947d649acba4bc5149d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.h	
>@@ -0,0 +1,32 @@
>+//
>+//  TestCallArgument.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+
>+typedef enum : NSUInteger {
>+    WHLSLTypeInt32,
>+    WHLSLTypeUint32,
>+    WHLSLTypeUint8,
>+    WHLSLTypeFloat,
>+    WHLSLTypeBool
>+} WHLSLType;
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface TestCallArgument : NSObject
>+
>+- (instancetype)initWithValue:(NSNumber*)value type:(WHLSLType)type;
>+
>+@property (readonly) NSNumber* value;
>+@property (readonly) WHLSLType type;
>+
>+- (NSString*)whlslSource;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..88ba94d3221b55ffa7eaafb893e98d7c006bd17c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.m	
>@@ -0,0 +1,44 @@
>+//
>+//  TestCallArgument.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "TestCallArgument.h"
>+
>+@interface TestCallArgument ()
>+
>+@property NSNumber* value;
>+@property WHLSLType type;
>+
>+@end
>+
>+@implementation TestCallArgument
>+
>+- (instancetype)initWithValue:(NSNumber *)value type:(WHLSLType)type
>+{
>+    if (self = [super init]) {
>+        self.value = value;
>+        self.type = type;
>+    }
>+    return self;
>+}
>+
>+- (NSString*)whlslSource
>+{
>+    switch (self.type) {
>+    case WHLSLTypeUint8:
>+    case WHLSLTypeUint32:
>+        return [NSString stringWithFormat:@"%uu", self.value.unsignedIntValue];
>+    case WHLSLTypeFloat:
>+        return [NSString stringWithFormat:@"%f", self.value.floatValue];
>+    case WHLSLTypeBool:
>+        return self.value.boolValue ? @"true" : @"false";
>+    case WHLSLTypeInt32:
>+        return [NSString stringWithFormat:@"%d", self.value.intValue];
>+    }
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..eca11ffba46065c13670d292074dc72e790ccbe0
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.h	
>@@ -0,0 +1,34 @@
>+//
>+//  TestDescription.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+@import Foundation;
>+#import "TestCallArgument.h"
>+
>+@class TestFamily;
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface TestDescription : NSObject
>+
>+- (instancetype)initWithFunctionName:(NSString*)functionName arguments:(NSArray<TestCallArgument*>*)arguments;
>+
>+@property NSString* functionName;
>+@property NSArray<TestCallArgument*>* arguments;
>+
>+@property WHLSLType returnType;
>+@property NSNumber* expectation;
>+
>+@property (weak) TestFamily* testFamily;
>+@property NSString* fragmentShaderName;
>+
>+- (NSString*)callString;
>+- (NSString*)fragmentShaderSource;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..37ced5e36e27e87400a42a91c2864d2c3907fa34
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.m	
>@@ -0,0 +1,98 @@
>+//
>+//  TestDescription.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "TestDescription.h"
>+
>+@implementation TestDescription
>+
>+- (instancetype)initWithFunctionName:(NSString *)functionName arguments:(NSArray<TestCallArgument *> *)arguments
>+{
>+    if (self = [super init]) {
>+        self.functionName = functionName;
>+        self.arguments = arguments;
>+    }
>+    return self;
>+}
>+
>+- (NSString*)callString
>+{
>+    NSMutableString* string = [NSMutableString new];
>+    [string appendFormat:@"%@(", self.functionName];
>+    
>+    BOOL first = YES;
>+    for (TestCallArgument* argument in self.arguments) {
>+        if (!first)
>+            [string appendFormat:@", %@", argument.whlslSource];
>+        else
>+            [string appendString:argument.whlslSource];
>+        first = NO;
>+    }
>+    
>+    [string appendString:@")"];
>+    return string;
>+}
>+
>+- (NSString*)fragmentShaderSource
>+{
>+    NSMutableString* string = [NSMutableString new];
>+    [string appendString:@"fragment "];
>+    switch (self.returnType) {
>+    case WHLSLTypeUint8:
>+    case WHLSLTypeUint32:
>+        [string appendString:@"FragmentOutputUint"];
>+        break;
>+    case WHLSLTypeInt32:
>+    case WHLSLTypeBool:
>+        [string appendString:@"FragmentOutputInt"];
>+        break;
>+    case WHLSLTypeFloat:
>+        [string appendString:@"FragmentOutputFloat"];
>+        break;
>+    }
>+    [string appendFormat:@" %@(VertexOutput stageIn)\n", self.fragmentShaderName];
>+    [string appendString:@"{\n"];
>+    
>+    switch (self.returnType) {
>+        case WHLSLTypeUint8:
>+        case WHLSLTypeUint32:
>+            [string appendString:@"    FragmentOutputUint fragmentOutput;\n"];
>+            break;
>+        case WHLSLTypeInt32:
>+        case WHLSLTypeBool:
>+            [string appendString:@"    FragmentOutputInt fragmentOutput;\n"];
>+            break;
>+        case WHLSLTypeFloat:
>+            [string appendString:@"    FragmentOutputFloat fragmentOutput;\n"];
>+            break;
>+    }
>+    
>+    NSString * call = [self callString];
>+    
>+    switch (self.returnType) {
>+        case WHLSLTypeBool:
>+            [string appendFormat:@"    if(%@)\n", call];
>+            [string appendString:@"        fragmentOutput.wsl_Color = 1;\n"];
>+            [string appendString:@"    else\n"];
>+            [string appendString:@"        fragmentOutput.wsl_Color = 0;\n"];
>+            break;
>+        case WHLSLTypeUint8:
>+            [string appendFormat:@"    fragmentOutput.wsl_Color = uint(%@);\n", call];
>+            break;
>+        case WHLSLTypeUint32:
>+        case WHLSLTypeInt32:
>+        case WHLSLTypeFloat:
>+            [string appendFormat:@"    fragmentOutput.wsl_Color = %@;\n", call];
>+    }
>+    
>+    [string appendString:@"    return fragmentOutput;\n"];
>+    [string appendString:@"}\n"];
>+    
>+    return string;
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..aa5a8550a37aaeace13afd18f23494200f3ebd33
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.h	
>@@ -0,0 +1,31 @@
>+//
>+//  TestFamily.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+#import "TestCallArgument.h"
>+#import "TestDescription.h"
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface TestFamily : NSObject
>+
>+- (instancetype)initWithName:(NSString*)name source:(NSString*)source;
>+
>+@property (readonly) NSString* name;
>+@property (readonly) NSString* source;
>+
>+- (void)addTestDescription:(TestDescription*)testDescription;
>+- (NSArray<TestDescription*>*)testsForReturnType:(WHLSLType)type;
>+
>+- (NSString*)fullTestSource;
>+
>++ (NSArray<TestFamily*>*)allTests;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..d56bb25f1df93703cd7e4466a4fab94d7001ca7f
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.m	
>@@ -0,0 +1,164 @@
>+//
>+//  TestFamily.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "TestFamily.h"
>+
>+@import JavaScriptCore;
>+
>+@interface TestFamily ()
>+
>+@property NSString* name;
>+@property NSString* source;
>+@property NSUInteger fragmentShaderIndex;
>+
>+@property NSMutableDictionary<NSNumber*, NSMutableArray<TestDescription*>*>* tests;
>+
>+@end
>+
>+@implementation TestFamily
>+
>+- (instancetype)initWithName:(NSString *)name source:(NSString *)source
>+{
>+    if (self = [super init]) {
>+        self.name = name;
>+        self.source = source;
>+        self.tests = [NSMutableDictionary new];
>+        self.tests[@(WHLSLTypeUint8)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeUint32)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeInt32)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeFloat)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeBool)] = [NSMutableArray new];
>+    }
>+    return self;
>+}
>+
>+- (void)addTestDescription:(TestDescription *)testDescription
>+{
>+    [self.tests[@(testDescription.returnType)] addObject:testDescription];
>+    testDescription.testFamily = self;
>+    testDescription.fragmentShaderName = [NSString stringWithFormat:@"%@%lu", self.name, self.fragmentShaderIndex++];
>+}
>+
>+- (NSArray<TestDescription*>*)testsForReturnType:(WHLSLType)type
>+{
>+    return self.tests[@(type)];
>+}
>+
>+- (NSString*)fullTestSource
>+{
>+    NSMutableString* source = [NSMutableString new];
>+    
>+    [source appendString:[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"_Shared" ofType:@"whlsl"] encoding:NSUTF8StringEncoding error:nil]];
>+    [source appendString:self.source];
>+    [source appendString:@"\n"];
>+    
>+    [self.tests enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull type, NSMutableArray<TestDescription *> * _Nonnull tests, BOOL * _Nonnull stop) {
>+        for (TestDescription* testDescription in tests) {
>+            [source appendFormat:@"%@\n", [testDescription fragmentShaderSource]];
>+        }
>+    }];
>+    
>+    return source;
>+}
>+
>++ (NSArray<TestFamily*>*)allTests
>+{
>+    JSContext* compilerContext = [JSContext new];
>+    
>+    NSString* testFile = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Test" ofType:@"js"] encoding:NSUTF8StringEncoding error:nil];
>+    [compilerContext evaluateScript:testFile];
>+    
>+    __block NSString *currentTestName = nil;
>+    __block BOOL includeTest = YES;
>+    
>+    NSMutableArray<TestFamily*>* testFamilies = [NSMutableArray new];
>+    
>+    // See the bottom of Test.js
>+    compilerContext[@"runningInCocoaHost"] = [JSValue valueWithBool:YES inContext:compilerContext];
>+    
>+    compilerContext[@"doPrep"] = ^TestFamily*(NSString* code) {
>+        TestFamily* family = [[TestFamily alloc] initWithName:currentTestName source:code];
>+        [testFamilies addObject:family];
>+        includeTest = YES;
>+        return family;
>+    };
>+    
>+    compilerContext.exceptionHandler = ^(JSContext *context, JSValue *exception) {
>+        includeTest = NO;
>+    };
>+    
>+    compilerContext[@"makeInt"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeInt32];
>+    };
>+    
>+    compilerContext[@"makeUint"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeInt32];
>+    };
>+    
>+    compilerContext[@"makeUint8"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeUint8];
>+    };
>+    
>+    compilerContext[@"makeBool"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeBool];
>+    };
>+    
>+    compilerContext[@"makeFloat"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeFloat];
>+    };
>+    
>+    compilerContext[@"callFunction"] = ^TestDescription*(TestFamily* program, NSString* functionName, NSArray* typeArguments, NSArray* args) {
>+        return [[TestDescription alloc] initWithFunctionName:functionName arguments:args];
>+    };
>+    
>+    void(^addTest)(TestFamily*,TestDescription*,NSNumber*,WHLSLType) = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation, WHLSLType type) {
>+        if (includeTest) {
>+            testDesc.returnType = type;
>+            testDesc.expectation = expectation;
>+            [program addTestDescription:testDesc];
>+        }
>+    };
>+    
>+    compilerContext[@"checkInt"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeInt32);
>+    };
>+    
>+    compilerContext[@"checkUint"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeUint32);
>+    };
>+    
>+    compilerContext[@"checkFloat"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeFloat);
>+    };
>+    
>+    compilerContext[@"checkBool"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeBool);
>+    };
>+    
>+    compilerContext[@"checkUint8"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeUint8);
>+    };
>+    
>+    // Deliberately not included
>+    compilerContext[@"checkEnum"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {};
>+    compilerContext[@"checkFail"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {};
>+    compilerContext[@"checkLexerToken"] = ^void(NSString* token, NSNumber* id, NSString* name, NSString* tokenText) {};
>+    
>+    JSValue* tests = [compilerContext evaluateScript:@"tests"];
>+    
>+    NSArray<NSString*>* testNames = [tests.toDictionary.allKeys sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
>+    
>+    for (currentTestName in testNames) {
>+        JSValue* func = [tests objectForKeyedSubscript:currentTestName];
>+        [func callWithArguments:@[]];
>+    }
>+    
>+    return testFamilies;
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..1589e3e8cd081018fa1f7dc3caab67812830f92e
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.h	
>@@ -0,0 +1,26 @@
>+//
>+//  TestFamilyRunner.h
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Foundation/Foundation.h>
>+#import "TestFamily.h"
>+
>+NS_ASSUME_NONNULL_BEGIN
>+
>+@interface TestFamilyRunner : NSObject
>+
>+- (instancetype)initWithTestFamily:(TestFamily*)testFamily;
>+
>+@property (readonly) TestFamily* testFamily;
>+
>+- (BOOL)executeAllTests;
>+
>++ (NSUInteger)executionCount;
>+
>+@end
>+
>+NS_ASSUME_NONNULL_END
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..97b5a7e24d567e7607e9fb81fbd7a4e468165ba0
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.m	
>@@ -0,0 +1,186 @@
>+//
>+//  TestFamilyRunner.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "TestFamilyRunner.h"
>+
>+#import "Compiler.h"
>+#import "OffscreenRenderer.h"
>+
>+static NSUInteger executionCount = 0;
>+
>+@interface TestFamilyRunner ()
>+
>+@property TestFamily* testFamily;
>+
>+@end
>+
>+@implementation TestFamilyRunner
>+
>+- (instancetype)initWithTestFamily:(TestFamily *)testFamily
>+{
>+    if (self = [super init]) {
>+        self.testFamily = testFamily;
>+    }
>+    return self;
>+}
>+
>++ (OffscreenRenderer*)intOffscreenRenderer
>+{
>+    static OffscreenRenderer* offscreenRenderer;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        offscreenRenderer = [[OffscreenRenderer alloc] init];
>+        [offscreenRenderer setOutputPixelFormat:MTLPixelFormatR32Sint];
>+        [offscreenRenderer setTargetWidth:1 setTargetHeight:1];
>+    });
>+    return offscreenRenderer;
>+}
>+
>++ (OffscreenRenderer*)uintOffscreenRenderer
>+{
>+    static OffscreenRenderer* offscreenRenderer;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        offscreenRenderer = [[OffscreenRenderer alloc] init];
>+        [offscreenRenderer setOutputPixelFormat:MTLPixelFormatR32Uint];
>+        [offscreenRenderer setTargetWidth:1 setTargetHeight:1];
>+    });
>+    return offscreenRenderer;
>+}
>+
>++ (OffscreenRenderer*)floatOffscreenRenderer
>+{
>+    static OffscreenRenderer* offscreenRenderer;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        offscreenRenderer = [[OffscreenRenderer alloc] init];
>+        [offscreenRenderer setOutputPixelFormat:MTLPixelFormatR32Float];
>+        [offscreenRenderer setTargetWidth:1 setTargetHeight:1];
>+    });
>+    return offscreenRenderer;
>+}
>+
>++ (Compiler*)compiler
>+{
>+    static Compiler* compiler;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        compiler = [Compiler new];
>+    });
>+    return compiler;
>+}
>+
>+- (BOOL)executeAllTests
>+{
>+    NSString* whlslSource = self.testFamily.fullTestSource;
>+    NSError* whlslCompileError = nil;
>+    CompileResult* result = [[TestFamilyRunner compiler] compileWhlslToMetal:whlslSource error:&whlslCompileError];
>+    if (!result) {
>+        NSLog(@"[%@]: WHLSL Compile Error: %@", self.testFamily.name, whlslCompileError.localizedDescription);
>+        return NO;
>+    }
>+    
>+    NSLog(@"Compiled WHLSL");
>+    
>+    id<MTLDevice> device = MTLCreateSystemDefaultDevice();
>+    MTLCompileOptions *compileOptions = [MTLCompileOptions new];
>+    NSError *error = nil;
>+    id<MTLLibrary> library = [device newLibraryWithSource:result.source options:compileOptions error:&error];
>+    if (!library) {
>+        NSLog(@"[Library]: %@", error.localizedDescription);
>+        return NO;
>+    }
>+    
>+    NSLog(@"Compiled metal");
>+    
>+    BOOL status = YES;
>+    
>+    NSString *vertexShaderName = [result defaultInstanceMethodForFunctionName:@"vertexShader"];
>+    
>+    OffscreenRenderer *intRenderer = [TestFamilyRunner intOffscreenRenderer];
>+    for (TestDescription* test in [self.testFamily testsForReturnType:WHLSLTypeInt32]) {
>+        NSString* fragmentShaderName = [result defaultInstanceMethodForFunctionName:test.fragmentShaderName];
>+        [intRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [intRenderer draw];
>+        
>+        int result = intRenderer.intValue;
>+        if (result != test.expectation.intValue) {
>+            NSLog(@"[%@]: (result)) %d != %d (expectation)", test.fragmentShaderName, result, test.expectation.intValue);
>+            status = NO;
>+        } else
>+            NSLog(@"[%@]: â", test.fragmentShaderName);
>+        executionCount++;
>+    }
>+    
>+    OffscreenRenderer *uintRenderer = [TestFamilyRunner uintOffscreenRenderer];
>+    for (TestDescription* test in [self.testFamily testsForReturnType:WHLSLTypeUint32]) {
>+        NSString* fragmentShaderName = [result defaultInstanceMethodForFunctionName:test.fragmentShaderName];
>+        [uintRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [uintRenderer draw];
>+        
>+        unsigned int result = uintRenderer.uintValue;
>+        if (result != test.expectation.unsignedIntValue) {
>+            NSLog(@"[%@]: (result)) %u != %u (expectation)", test.fragmentShaderName, result, test.expectation.unsignedIntValue);
>+            status = NO;
>+        } else
>+            NSLog(@"[%@]: â", test.fragmentShaderName);
>+        executionCount++;
>+    }
>+    
>+    for (TestDescription* test in [self.testFamily testsForReturnType:WHLSLTypeUint8]) {
>+        NSString* fragmentShaderName = [result defaultInstanceMethodForFunctionName:test.fragmentShaderName];
>+        [uintRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [uintRenderer draw];
>+        
>+        unsigned int result = uintRenderer.uintValue;
>+        if (result != test.expectation.unsignedIntValue) {
>+            NSLog(@"[%@]: (result)) %u != %u (expectation)", test.fragmentShaderName, result, test.expectation.unsignedIntValue);
>+            status = NO;
>+        } else
>+            NSLog(@"[%@]: â", test.fragmentShaderName);
>+        executionCount++;
>+    }
>+    
>+    OffscreenRenderer *floatRenderer = [TestFamilyRunner floatOffscreenRenderer];
>+    for (TestDescription* test in [self.testFamily testsForReturnType:WHLSLTypeFloat]) {
>+        NSString* fragmentShaderName = [result defaultInstanceMethodForFunctionName:test.fragmentShaderName];
>+        [floatRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [floatRenderer draw];
>+        
>+        float result = floatRenderer.floatValue;
>+        if (result != test.expectation.floatValue) {
>+            NSLog(@"[%@]: (result)) %f != %f (expectation)", test.fragmentShaderName, result, test.expectation.floatValue);
>+            status = NO;
>+        } else
>+            NSLog(@"[%@]: â", test.fragmentShaderName);
>+        executionCount++;
>+    }
>+    
>+    for (TestDescription* test in [self.testFamily testsForReturnType:WHLSLTypeBool]) {
>+        NSString* fragmentShaderName = [result defaultInstanceMethodForFunctionName:test.fragmentShaderName];
>+        [intRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [intRenderer draw];
>+        
>+        int result = intRenderer.intValue;
>+        if (result != test.expectation.intValue) {
>+            NSLog(@"[%@]: (result)) %d != %d (expectation)", test.fragmentShaderName, result, test.expectation.intValue);
>+            status = NO;
>+        } else
>+            NSLog(@"[%@]: â", test.fragmentShaderName);
>+        executionCount++;
>+    }
>+    
>+    return status;
>+}
>+
>++ (NSUInteger)executionCount
>+{
>+    return executionCount;
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.h b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..9f5fcfb69a1059476fe1660a1558e81cf381da72
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.h	
>@@ -0,0 +1,24 @@
>+//
>+//  ViewController.h
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Cocoa/Cocoa.h>
>+#import <MetalKit/MetalKit.h>
>+#import "CustomMetalView.h"
>+
>+#import "Compiler.h"
>+
>+@interface ViewController : NSViewController<NSGestureRecognizerDelegate, CustomMetalViewDelegate, NSTextViewDelegate>
>+
>+@property (unsafe_unretained) IBOutlet NSTextView *whlslTextView;
>+@property (unsafe_unretained) IBOutlet NSTextView *mslTextView;
>+@property (weak) IBOutlet CustomMetalView *metalView;
>+
>+@property Compiler *compiler;
>+
>+@end
>+
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..5a072a1a04cab3743931c4dd95a445f68dbe4723
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.m	
>@@ -0,0 +1,232 @@
>+//
>+//  ViewController.m
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "ViewController.h"
>+#import "OnscreenRenderer.h"
>+
>+@interface ViewController ()
>+
>+@property OnscreenRenderer *renderer;
>+@property NSMagnificationGestureRecognizer *magnifyGesture;
>+@property NSRotationGestureRecognizer *rotationGesture;
>+@property (weak) IBOutlet NSTextField *debugLabel;
>+@property (weak) IBOutlet NSScrollView *whlslViewContainer;
>+@property (weak) IBOutlet NSScrollView *mslViewContainer;
>+@property id<MTLLibrary> library;
>+
>+@end
>+
>+@implementation ViewController
>+
>+- (void)viewDidLoad {
>+    [super viewDidLoad];
>+
>+    [self loadFile:@"Default"];
>+    
>+    self.compiler = [[Compiler alloc] init];
>+    
>+    self.metalView.device = MTLCreateSystemDefaultDevice();
>+    self.renderer = [[OnscreenRenderer alloc] initWithView:self.metalView];
>+    
>+    self.magnifyGesture = [[NSMagnificationGestureRecognizer alloc] initWithTarget:self action:@selector(zoom:)];
>+    self.magnifyGesture.delegate = self;
>+    [self.metalView addGestureRecognizer:self.magnifyGesture];
>+    
>+    self.rotationGesture = [[NSRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
>+    self.rotationGesture.delegate = self;
>+    [self.metalView addGestureRecognizer:self.rotationGesture];
>+    
>+    self.metalView.scrollDelegate = self;
>+    
>+    [self viewDidLayout];
>+    
>+    self.whlslTextView.delegate = self;
>+    
>+    self.library = [self.renderer.device newDefaultLibraryWithBundle:[NSBundle mainBundle] error:nil];
>+}
>+
>+- (void)viewDidAppear
>+{
>+    [super viewDidAppear];
>+    [self updateHighlighting];
>+}
>+
>+- (BOOL)gestureRecognizer:(NSGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(nonnull NSGestureRecognizer *)otherGestureRecognizer
>+{
>+    return YES;
>+}
>+
>+- (void)viewDidLayout
>+{
>+    [super viewDidLayout];
>+    
>+    CGFloat width = CGRectGetWidth(self.view.frame);
>+    CGFloat boxWidth = (width - 20 * 2 - 10 * 2) / 3;
>+    CGFloat height = CGRectGetHeight(self.view.frame);
>+    CGFloat boxHeight = height - 60 - 20;
>+    
>+    self.whlslViewContainer.frame = CGRectMake(20, 60, boxWidth, boxHeight);
>+    self.mslViewContainer.frame = CGRectMake(20 + boxWidth + 10, 60, boxWidth, boxHeight);
>+    self.metalView.frame = CGRectMake(20 + boxWidth + 10 + boxWidth + 10, 60, boxWidth, boxHeight);
>+    
>+    float ratio = boxHeight / (boxWidth / 3);
>+    // NOTE: simd_matrix takes columns, not rows!
>+    self.renderer.transformMatrix = simd_matrix(simd_make_float3(3, 0, 0),
>+                                                simd_make_float3(0,  ratio, 0),
>+                                                simd_make_float3(-2.2, -ratio / 2, 1));
>+    
>+    self.debugLabel.stringValue = [NSString stringWithFormat:@"Width = %f, height = %f", boxWidth, boxHeight];
>+}
>+
>+- (IBAction)resetViewport:(id)sender
>+{
>+    [self viewDidLayout];
>+    [self.metalView setNeedsDisplay:YES];
>+}
>+
>+- (IBAction)loadDefault:(id)sender
>+{
>+    [self loadFile:@"Default"];
>+}
>+
>+- (IBAction)loadMandelbrot:(id)sender
>+{
>+    [self loadFile:@"Mandelbrot"];
>+}
>+
>+- (IBAction)loadJulia:(id)sender
>+{
>+    [self loadFile:@"Julia"];
>+}
>+
>+- (void)loadFile:(NSString*)name
>+{
>+    NSString* defaultFilePath = [[NSBundle mainBundle] pathForResource:name ofType:@"whlsl"];
>+    NSString* defaultContents = [NSString stringWithContentsOfFile:defaultFilePath encoding:NSUTF8StringEncoding error:nil];
>+    
>+    // Do any additional setup after loading the view.
>+    self.whlslTextView.string = defaultContents;
>+    self.mslTextView.string = @"";
>+    self.metalView.hidden = YES;
>+    
>+    [self updateHighlighting];
>+}
>+
>+- (IBAction)compileClicked:(id)sender {
>+    NSError *error = nil;
>+    CompileResult *output = [self.compiler compileWhlslToMetal:self.whlslTextView.string error:&error];
>+    if (error)
>+        self.mslTextView.string = error.localizedDescription;
>+    else {
>+        self.metalView.hidden = NO;
>+        self.mslTextView.string = output.source;
>+        NSString *vertexShaderName = [output defaultInstanceMethodForFunctionName:@"vertexShader"];
>+        NSString *fragmentShaderName = [output defaultInstanceMethodForFunctionName:@"fragmentShader"];
>+        [self viewDidLayout];
>+        [self.renderer setShaderSource:output.source vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [self.metalView setNeedsDisplay:YES];   
>+    }
>+    self.mslTextView.font = [NSFont fontWithName:@"Menlo" size:12];
>+    
>+    [self updateHighlighting];
>+}
>+
>+- (IBAction)loadNativeFlatColor:(id)sender
>+{
>+    [self loadNativeFlatColor:@"flatColor"];
>+}
>+
>+- (IBAction)loadNativeMandelbrot:(id)sender
>+{
>+    [self loadNativeMetalShaderWithName:@"mandelbrot"];
>+}
>+
>+- (IBAction)loadNativeJulia:(id)sender
>+{
>+    [self loadNativeMetalShaderWithName:@"julia"];
>+}
>+
>+- (void)loadNativeMetalShaderWithName:(NSString*)name
>+{
>+    NSString* vertexShaderName = [name stringByAppendingString:@"VertexShader"];
>+    NSString* fragmentShaderName = [name stringByAppendingString:@"FragmentShader"];
>+    [self viewDidLayout];
>+    [self.renderer setLibrary:self.library vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName pixelFormat:self.metalView.colorPixelFormat];
>+    [self.metalView setNeedsDisplay:YES];
>+}
>+
>+- (void)updateHighlighting
>+{
>+    [self.compiler lexMsl:self.mslTextView.textStorage];
>+    [self.compiler lexWhlsl:self.whlslTextView.textStorage];
>+}
>+
>+- (IBAction)zoom:(id)sender
>+{
>+    float factor = 1.0f / (1 + self.magnifyGesture.magnification);
>+    NSPoint location = [self.magnifyGesture locationInView:self.metalView];
>+    float normalizedX = location.x / CGRectGetWidth(self.metalView.frame);
>+    float normalizedY = location.y / CGRectGetHeight(self.metalView.frame);
>+    simd_float3 normalized = simd_make_float3(normalizedX, normalizedY, 1);
>+    normalized = matrix_multiply(self.renderer.transformMatrix, normalized);
>+    simd_float3x3 initTransform = simd_matrix(simd_make_float3(1, 0, 0),
>+                                              simd_make_float3(0, 1, 0),
>+                                              simd_make_float3(-normalized.x, -normalized.y, 1));
>+    simd_float3x3 scaleMatrix = simd_matrix(simd_make_float3(factor, 0.f, 0.f),
>+                                            simd_make_float3(0.f, factor, 0.f),
>+                                            simd_make_float3(0.f, 0.f, 1));
>+    simd_float3x3 backTransform = simd_matrix(simd_make_float3(1, 0, 0),
>+                                              simd_make_float3(0, 1, 0),
>+                                              simd_make_float3(normalized.x, normalized.y, 1));
>+    self.renderer.transformMatrix = matrix_multiply(matrix_multiply(backTransform, matrix_multiply(scaleMatrix, initTransform)), self.renderer.transformMatrix);
>+    self.magnifyGesture.magnification = 0;
>+    [self.metalView setNeedsDisplay:YES];
>+}
>+
>+- (IBAction)rotate:(id)sender
>+{
>+    float angle = -self.rotationGesture.rotation;
>+    NSPoint location = [self.rotationGesture locationInView:self.metalView];
>+    float normalizedX = location.x / CGRectGetWidth(self.metalView.frame);
>+    float normalizedY = location.y / CGRectGetHeight(self.metalView.frame);
>+    simd_float3 normalized = simd_make_float3(normalizedX, normalizedY, 1);
>+    normalized = matrix_multiply(self.renderer.transformMatrix, normalized);
>+    //    NSLog(@"%f %f", normalized.x, normalized.y);
>+    simd_float3x3 initTransform = simd_matrix(simd_make_float3(1, 0, 0),
>+                                              simd_make_float3(0, 1, 0),
>+                                              simd_make_float3(-normalized.x, -normalized.y, 1));
>+    simd_float3x3 rotationMatrix = simd_matrix(simd_make_float3(cos(angle), sin(angle), 0.f),
>+                                               simd_make_float3(-sin(angle), cos(angle), 0.f),
>+                                               simd_make_float3(0.f, 0.f, 1));
>+    simd_float3x3 backTransform = simd_matrix(simd_make_float3(1, 0, 0),
>+                                              simd_make_float3(0, 1, 0),
>+                                              simd_make_float3(normalized.x, normalized.y, 1));
>+    self.renderer.transformMatrix = matrix_multiply(matrix_multiply(backTransform, matrix_multiply(rotationMatrix, initTransform)), self.renderer.transformMatrix);
>+    self.rotationGesture.rotation = 0;
>+    [self.metalView setNeedsDisplay:YES];
>+}
>+
>+- (void)customMetalView:(CustomMetalView *)metalView scrolledDeltaX:(CGFloat)deltaX deltaY:(CGFloat)deltaY
>+{
>+    float width = self.metalView.bounds.size.width;
>+    float height = self.metalView.bounds.size.height;
>+    float scrollVelocity = 6;
>+    float x = -deltaX / width * scrollVelocity;
>+    float y = deltaY / height * scrollVelocity;
>+    simd_float3x3 m = simd_matrix(simd_make_float3(1, 0, 0),
>+                                  simd_make_float3(0, 1, 0),
>+                                  simd_make_float3(x, y, 1));
>+    self.renderer.transformMatrix = matrix_multiply(self.renderer.transformMatrix, m);
>+}
>+
>+- (void)textDidChange:(NSNotification *)notification
>+{
>+    [self updateHighlighting];
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/WHLSL.entitlements b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/WHLSL.entitlements
>new file mode 100644
>index 0000000000000000000000000000000000000000..f2ef3ae0265b40c475e8ef90e3a311c31786c594
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/WHLSL.entitlements	
>@@ -0,0 +1,10 @@
>+<?xml version="1.0" encoding="UTF-8"?>
>+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
>+<plist version="1.0">
>+<dict>
>+    <key>com.apple.security.app-sandbox</key>
>+    <true/>
>+    <key>com.apple.security.files.user-selected.read-only</key>
>+    <true/>
>+</dict>
>+</plist>
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_Shared.whlsl b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_Shared.whlsl
>new file mode 100644
>index 0000000000000000000000000000000000000000..2b5dc3618b3fe2e555399105a385cc06a1b7a653
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_Shared.whlsl	
>@@ -0,0 +1,12 @@
>+struct VertexInput { float2 position; float2 uv; }
>+struct VertexOutput { float4 wsl_Position; }
>+struct FragmentOutputFloat { float wsl_Color; }
>+struct FragmentOutputInt { int wsl_Color; }
>+struct FragmentOutputUint { uint wsl_Color; }
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput)
>+{
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    return result;
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/main.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/main.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..22bf7ee48b4d29565d0b7256054a624fc5f47994
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/main.m	
>@@ -0,0 +1,14 @@
>+//
>+//  main.m
>+//  WHLSL Toy
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <Cocoa/Cocoa.h>
>+
>+int main(int argc, const char * argv[])
>+{
>+    return NSApplicationMain(argc, argv);
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL Tests.xcodeproj/project.pbxproj b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL Tests.xcodeproj/project.pbxproj
>new file mode 100644
>index 0000000000000000000000000000000000000000..1dbf60eca9f0286af5cbca3361dad47473d2e1cb
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL Tests.xcodeproj/project.pbxproj	
>@@ -0,0 +1,1226 @@
>+// !$*UTF8*$!
>+{
>+	archiveVersion = 1;
>+	classes = {
>+	};
>+	objectVersion = 50;
>+	objects = {
>+
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>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist
>new file mode 100644
>index 0000000000000000000000000000000000000000..6c40a6cd0c4af2f0d93b697fbfb066793681b045
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist	
>@@ -0,0 +1,22 @@
>+<?xml version="1.0" encoding="UTF-8"?>
>+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
>+<plist version="1.0">
>+<dict>
>+	<key>CFBundleDevelopmentRegion</key>
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>+	<string>$(EXECUTABLE_NAME)</string>
>+	<key>CFBundleIdentifier</key>
>+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
>+	<key>CFBundleInfoDictionaryVersion</key>
>+	<string>6.0</string>
>+	<key>CFBundleName</key>
>+	<string>$(PRODUCT_NAME)</string>
>+	<key>CFBundlePackageType</key>
>+	<string>BNDL</string>
>+	<key>CFBundleShortVersionString</key>
>+	<string>1.0</string>
>+	<key>CFBundleVersion</key>
>+	<string>1</string>
>+</dict>
>+</plist>
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/WHLSL_ToyTests.m b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/WHLSL_ToyTests.m
>new file mode 100644
>index 0000000000000000000000000000000000000000..c8deefb48ee622da0a150e7760e6b6ea173c5625
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/WHLSL_ToyTests.m	
>@@ -0,0 +1,68 @@
>+//
>+//  WHLSL_ToyTests.m
>+//  WHLSL ToyTests
>+//
>+//  Created by Thomas Denney on 7/10/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import <XCTest/XCTest.h>
>+
>+#import "TestFamily.h"
>+#import "TestFamilyRunner.h"
>+
>+/// The actual implementation of tests is in Test.h/m
>+@interface WHLSLShaderTest : XCTestCase
>+
>+@end
>+
>+@implementation WHLSLShaderTest
>+
>++ (WHLSLShaderTest*)testCaseInstanceFromImplementation:(TestFamily*)test
>+{
>+    NSMethodSignature *testSignature = [WHLSLShaderTest instanceMethodSignatureForSelector:@selector(testShaderCompilationAndExecution:)];
>+    NSInvocation *testInvocation = [NSInvocation invocationWithMethodSignature:testSignature];
>+    testInvocation.selector = @selector(testShaderCompilationAndExecution:);
>+    [testInvocation setArgument:&test atIndex:2];
>+    [testInvocation retainArguments];
>+    
>+    WHLSLShaderTest *testCase = [[WHLSLShaderTest alloc] initWithInvocation:testInvocation];
>+    return testCase;
>+}
>+
>+- (void)testShaderCompilationAndExecution:(TestFamily*)test {
>+    // Xcode gives each test case instance the same name (based on the method signature)
>+    // As a (temporary) workaround I log the name of the test so that I can quickly identify the instance
>+    NSLog(@"%@", test.name);
>+    TestFamilyRunner* runner = [[TestFamilyRunner alloc] initWithTestFamily:test];
>+    BOOL result = [runner executeAllTests];
>+    if (result)
>+        NSLog(@"\u2705 %@", test.name);
>+    XCTAssert(result, @"%@", test.name/*, test.failureDescription*/);
>+    NSLog(@"%lu", [TestFamilyRunner executionCount]);
>+}
>+
>+@end
>+
>+@interface WHLSL_ToyTests : XCTestCase
>+
>+@end
>+
>+@implementation WHLSL_ToyTests
>+
>++ (XCTestSuite*)defaultTestSuite
>+{
>+    XCTestSuite* suite = [XCTestSuite testSuiteWithName:@"WHLSL tests"];
>+    NSArray<TestFamily*>* testDescriptions = [TestFamily allTests];
>+    NSRegularExpression* testFilter = [NSRegularExpression regularExpressionWithPattern:@"^exhaustiveUint8Switch" options:0 error:nil];
>+    for (TestFamily* test in testDescriptions) {
>+        if ([testFilter firstMatchInString:test.name options:0 range:NSMakeRange(0, test.name.length)])
>+            [suite addTest:[WHLSLShaderTest testCaseInstanceFromImplementation:test]];
>+    }
>+    
>+    NSLog(@"Will execute %ld tests", suite.tests.count);
>+
>+    return suite;
>+}
>+
>+@end
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSLLexer.ts b/Tools/WebGPUShadingLanguageRI/Metal/WHLSLLexer.ts
>new file mode 100644
>index 0000000000000000000000000000000000000000..e82bcd126a0b9d689c2d2398972e15bed0994397
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSLLexer.ts
>@@ -0,0 +1,86 @@
>+function lexWhitespaceAndComment(src, startIndex) {
>+    // WHLSL permits multiline comments, but the (restricted) MSL lexer doesn't
>+    const wsRegex = /^\s+/;
>+    const oneLineCommentRegex = /^\/\/(.*?)(\n|$)/;
>+    const multilineCommentStartRegex = /^\/\*/;
>+    const multilineCommentEndRegex = /\*\//;
>+
>+    const tokens: Token[] = [];
>+
>+    const originalLength = src.length;
>+
>+    while (src.length) {
>+        const wsMatch = wsRegex.exec(src);
>+        if (wsMatch) {
>+            tokens.push(new Token("whitespace", wsMatch[0], originalLength - src.length + startIndex));
>+            src = src.substring(wsMatch[0].length);
>+            continue;
>+        }
>+
>+        const oneLineCommentMatch = oneLineCommentRegex.exec(src);
>+        if (oneLineCommentMatch) {
>+            tokens.push(new Token("comment", oneLineCommentMatch[0], originalLength - src.length + startIndex));
>+            src = src.substring(oneLineCommentMatch[0].length);
>+            continue;
>+        }
>+
>+        const multilineCommentStartMatch = multilineCommentStartRegex.exec(src);
>+        if (multilineCommentStartMatch) {
>+            const multilineCommentEndMatch = multilineCommentEndRegex.exec(src);
>+            if (multilineCommentEndMatch) {
>+                const index = multilineCommentEndMatch.index + 2;
>+                tokens.push(new Token("comment", src.substring(0, index), originalLength - src.length + startIndex));
>+                src = src.substring(index);
>+            } else {
>+                throw new Error(`Multiline comment not terminated properly: '${src}'`);
>+            }
>+            continue;
>+        }
>+
>+        throw new Error(`Failed to tokenize whitespace/comment string '${src}'`);
>+    }
>+
>+    return tokens;
>+}
>+
>+function lexWHLSL(src)
>+{
>+    const lexer = new Lexer("/internal/test", "user", 0, src);
>+    let index = 0;
>+    let hasTokens = true;
>+    let tokens: Token[] = [];
>+
>+    const mapWHLSLTokens = {
>+        "floatLiteral": "literal",
>+        "intHexLiteral": "literal",
>+        "uintHexLiteral": "literal",
>+        "intLiteral": "literal",
>+        "uintLiteral": "literal"
>+    };
>+    const identifiersThatAreTypes = new Set([
>+        "int", "uint", "float", "int32", "uint32", "uint8", "float2", "float3", "float4", "vertex", "fragment", "void", "bool"
>+    ]);
>+
>+    while (hasTokens) {
>+        const next = lexer.next();
>+        if (next) {
>+            // tokens.push(next);
>+            if (next.index > index) {
>+                tokens = tokens.concat(lexWhitespaceAndComment(src.substring(index, next.index), index));
>+            }
>+            index = next.index + next.text.length;
>+            let kind = next.kind;
>+            if (kind in mapWHLSLTokens)
>+                kind = mapWHLSLTokens[kind];
>+            if (kind == "identifier" && identifiersThatAreTypes.has(next.text))
>+                kind = "type";
>+            tokens.push(new Token(kind, next.text, next.index));
>+        } else {
>+            hasTokens = false;
>+        }
>+    }
>+    if (index != src.length) {
>+        tokens = tokens.concat(lexWhitespaceAndComment(src.substring(index), index));
>+    }
>+    return tokens;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/index.html b/Tools/WebGPUShadingLanguageRI/Metal/index.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..54817fc8c6644ab4eef44274cfbd608f756b489b
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/index.html
>@@ -0,0 +1,439 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>WebGPU Shading Language (WHLSL) &#8594; Metal Shading Language</title>
>+    <script src="../Node.js"></script>
>+    <script src="../Type.js"></script>
>+    <script src="../ReferenceType.js"></script>
>+    <script src="../Value.js"></script>
>+    <script src="../Expression.js"></script>
>+    <script src="../Rewriter.js"></script>
>+    <script src="../Visitor.js"></script>
>+    <script src="../CreateLiteral.js"></script>
>+    <script src="../CreateLiteralType.js"></script>
>+    <script src="../PropertyAccessExpression.js"></script>
>+    <script src="../SwizzleOp.js"></script>
>+    
>+    <script src="../AddressSpace.js"></script>
>+    <script src="../AnonymousVariable.js"></script>
>+    <script src="../ArrayRefType.js"></script>
>+    <script src="../ArrayType.js"></script>
>+    <script src="../Assignment.js"></script>
>+    <script src="../AutoWrapper.js"></script>
>+    <script src="../Block.js"></script>
>+    <script src="../BoolLiteral.js"></script>
>+    <script src="../Break.js"></script>
>+    <script src="../CallExpression.js"></script>
>+    <script src="../CallFunction.js"></script>
>+    <script src="../Check.js"></script>
>+    <script src="../CheckLiteralTypes.js"></script>
>+    <script src="../CheckLoops.js"></script>
>+    <script src="../CheckRecursion.js"></script>
>+    <script src="../CheckRecursiveTypes.js"></script>
>+    <script src="../CheckReturns.js"></script>
>+    <script src="../CheckUnreachableCode.js"></script>
>+    <script src="../CheckWrapped.js"></script>
>+    <script src="../Checker.js"></script>
>+    <script src="../CloneProgram.js"></script>
>+    <script src="../CommaExpression.js"></script>
>+    <script src="../ConstexprFolder.js"></script>
>+    <script src="../ConstexprTypeParameter.js"></script>
>+    <script src="../Continue.js"></script>
>+    <script src="../ConvertPtrToArrayRefExpression.js"></script>
>+    <script src="../DoWhileLoop.js"></script>
>+    <script src="../DotExpression.js"></script>
>+    <script src="../DereferenceExpression.js"></script>
>+    <script src="../EArrayRef.js"></script>
>+    <script src="../EBuffer.js"></script>
>+    <script src="../EBufferBuilder.js"></script>
>+    <script src="../EPtr.js"></script>
>+    <script src="../EnumLiteral.js"></script>
>+    <script src="../EnumMember.js"></script>
>+    <script src="../EnumType.js"></script>
>+    <script src="../EvaluationCommon.js"></script>
>+    <script src="../Evaluator.js"></script>
>+    <script src="../ExpressionFinder.js"></script>
>+    <script src="../ExternalOrigin.js"></script>
>+    <script src="../Field.js"></script>
>+    <script src="../FindHighZombies.js"></script>
>+    <script src="../FlattenProtocolExtends.js"></script>
>+    <script src="../FlattenedStructOffsetGatherer.js"></script>
>+    <script src="../FloatLiteral.js"></script>
>+    <script src="../FloatLiteralType.js"></script>
>+    <script src="../FoldConstexprs.js"></script>
>+    <script src="../ForLoop.js"></script>
>+    <script src="../Func.js"></script>
>+    <script src="../FuncDef.js"></script>
>+    <script src="../FuncInstantiator.js"></script>
>+    <script src="../FuncParameter.js"></script>
>+    <script src="../FunctionLikeBlock.js"></script>
>+    <script src="../HighZombieFinder.js"></script>
>+    <script src="../IdentityExpression.js"></script>
>+    <script src="../IfStatement.js"></script>
>+    <script src="../IndexExpression.js"></script>
>+    <script src="../InferTypesForCall.js"></script>
>+    <script src="../Inline.js"></script>
>+    <script src="../Inliner.js"></script>
>+    <script src="../InstantiateImmediates.js"></script>
>+    <script src="../IntLiteral.js"></script>
>+    <script src="../IntLiteralType.js"></script>
>+    <script src="../Intrinsics.js"></script>
>+    <script src="../LateChecker.js"></script>
>+    <script src="../Lexer.js"></script>
>+    <script src="../LexerToken.js"></script>
>+    <script src="../LiteralTypeChecker.js"></script>
>+    <script src="../LogicalExpression.js"></script>
>+    <script src="../LogicalNot.js"></script>
>+    <script src="../LoopChecker.js"></script>
>+    <script src="../MakeArrayRefExpression.js"></script>
>+    <script src="../MakePtrExpression.js"></script>
>+    <script src="../NameContext.js"></script>
>+    <script src="../NameFinder.js"></script>
>+    <script src="../NameResolver.js"></script>
>+    <script src="../NativeFunc.js"></script>
>+    <script src="../NativeFuncInstance.js"></script>
>+    <script src="../NativeType.js"></script>
>+    <script src="../NativeTypeInstance.js"></script>
>+    <script src="../NormalUsePropertyResolver.js"></script>
>+    <script src="../NullLiteral.js"></script>
>+    <script src="../NullType.js"></script>
>+    <script src="../OriginKind.js"></script>
>+    <script src="../OverloadResolutionFailure.js"></script>
>+    <script src="../Parse.js"></script>
>+    <script src="../Prepare.js"></script>
>+    <script src="../PropertyResolver.js"></script>
>+    <script src="../Program.js"></script>
>+    <script src="../ProgramWithUnnecessaryThingsRemoved.js"></script>
>+    <script src="../Protocol.js"></script>
>+    <script src="../ProtocolDecl.js"></script>
>+    <script src="../ProtocolFuncDecl.js"></script>
>+    <script src="../ProtocolRef.js"></script>
>+    <script src="../PtrType.js"></script>
>+    <script src="../ReadModifyWriteExpression.js"></script>
>+    <script src="../RecursionChecker.js"></script>
>+    <script src="../RecursiveTypeChecker.js"></script>
>+    <script src="../ResolveNames.js"></script>
>+    <script src="../ResolveOverloadImpl.js"></script>
>+    <script src="../ResolveProperties.js"></script>
>+    <script src="../ResolveTypeDefs.js"></script>
>+    <script src="../Return.js"></script>
>+    <script src="../ReturnChecker.js"></script>
>+    <script src="../ReturnException.js"></script>
>+    <script src="../StandardLibrary.js"></script>
>+    <script src="../StatementCloner.js"></script>
>+    <script src="../StructLayoutBuilder.js"></script>
>+    <script src="../StructType.js"></script>
>+    <script src="../Substitution.js"></script>
>+    <script src="../SwitchCase.js"></script>
>+    <script src="../SwitchStatement.js"></script>
>+    <script src="../SynthesizeEnumFunctions.js"></script>
>+    <script src="../SynthesizeStructAccessors.js"></script>
>+    <script src="../TrapStatement.js"></script>
>+    <script src="../TypeDef.js"></script>
>+    <script src="../TypeDefResolver.js"></script>
>+    <script src="../TypeOrVariableRef.js"></script>
>+    <script src="../TypeParameterRewriter.js"></script>
>+    <script src="../TypeRef.js"></script>
>+    <script src="../TypeVariable.js"></script>
>+    <script src="../TypeVariableTracker.js"></script>
>+    <script src="../TypedValue.js"></script>
>+    <script src="../UintLiteral.js"></script>
>+    <script src="../UintLiteralType.js"></script>
>+    <script src="../UnificationContext.js"></script>
>+    <script src="../UnreachableCodeChecker.js"></script>
>+    <script src="../VariableDecl.js"></script>
>+    <script src="../VariableRef.js"></script>
>+    <script src="../VisitingSet.js"></script>
>+    <script src="../WSyntaxError.js"></script>
>+    <script src="../WTrapError.js"></script>
>+    <script src="../WTypeError.js"></script>
>+    <script src="../WhileLoop.js"></script>
>+    <script src="../WrapChecker.js"></script>
>+
>+<script src="compiler.js"></script>
>+
>+<link rel="stylesheet" type="text/css" href="metal.css" />
>+
>+<script>
>+let defaultShaderSource = `struct VertexInput {
>+    float2 position;
>+    float3 color;
>+}
>+
>+struct VertexOutput {
>+    float4 wsl_Position;
>+    float3 color;
>+}
>+
>+struct FragmentOutput {
>+    float4 wsl_Color;
>+}
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput) {
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    result.color = vertexInput.color;
>+    return result;
>+}
>+
>+fragment FragmentOutput fragmentShader(VertexOutput stageIn) {
>+    FragmentOutput result;
>+    result.wsl_Color = float4(stageIn.color, 1.);
>+    return result;
>+}`;
>+
>+let whlslContainer;
>+let mslContainer;
>+
>+let whlslSourceView;
>+let mslSourceView;
>+
>+const LocalStorageWhlslKeyName = "ShaderSource";
>+const LocalStorageMslKeyName = "ShaderMSLResult";
>+
>+window.addEventListener("load", () => {
>+    mslContainer = document.getElementById("MetalOutput");
>+    mslSourceView = new SourceView("MSL (previous compilation)", mslContainer, (src) => new MSLLexer(src).tokens);
>+
>+    try {
>+        const localStorage = window.localStorage;
>+        const mslSource = localStorage.getItem(LocalStorageMslKeyName);
>+        mslSourceView.src = mslSource;
>+    } catch(e) {
>+    }
>+
>+    whlslContainer = document.getElementById("WHLSLInput");
>+    whlslSourceView = new SourceView("WHLSL", whlslContainer, lexWHLSL, compileWHLSL, true);
>+
>+    try {
>+        const localStorage = window.localStorage;
>+        let whlslSource = localStorage.getItem(LocalStorageWhlslKeyName);
>+        if (!whlslSource)
>+            whlslSource = defaultShaderSource;
>+        whlslSourceView.src = whlslSource;
>+        whlslSourceView.compile();
>+    } catch (e) {
>+        console.log(e);
>+    }
>+});
>+
>+function compileWHLSL(src) {
>+    window.localStorage.setItem(LocalStorageWhlslKeyName, src);
>+    const compileResult = whlslToMsl(src);
>+
>+    if (compileResult.didSucceed) {
>+        mslSourceView.src = compileResult.metalShaderLanguageSource;
>+        mslSourceView.name = "MSL";
>+
>+        const copyMap = compileResult.functionSources;
>+        copyMap.set("MSL", compileResult.metalShaderLanguageSource);
>+        mslSourceView.copySources = copyMap;
>+        console.log(copyMap);
>+
>+        window.localStorage.setItem(LocalStorageMslKeyName, compileResult.metalShaderLanguageSource);
>+    } else {
>+        mslSourceView.name = "MSL (previous compilation)";
>+        whlslSourceView.errorText = compileResult.error.message;
>+    }
>+}
>+
>+// Wraps a textarea and a bunch of buttons
>+class SourceView {
>+    constructor(name, container, lexer, compiler = null, editable = false)
>+    {
>+        this._name = name;
>+        this._container = container;
>+        this._lexingDelegate = lexer;
>+        this._compiler = compiler;
>+        this._copySources = new Map();
>+        this._src = "";
>+        this._tokens = [];
>+        this._editable = editable;
>+        this._errorText = "";
>+    }
>+
>+    get name() { return this._name; }
>+    get editable() { return this._editable; }
>+    get src() { return this._src; }
>+
>+    set src(newSrc)
>+    {
>+        this._src = newSrc;
>+        this._tokens = this._lexingDelegate(this._src);
>+        this._updateView();
>+    }
>+
>+    get copySources() { return this._copySources; }
>+    set copySources(cs)
>+    {
>+        this._copySources = cs;
>+        this._updateView();
>+    }
>+
>+    get errorText() { return this._errorText; }
>+
>+    set errorText(newErrorText)
>+    {
>+        this._errorText = newErrorText;
>+        if (this._errorBox && newErrorText)
>+            this._errorBox.innerText = this._errorText;
>+    }
>+
>+    set name(newName)
>+    {
>+        this._name = newName;
>+        if (this._header)
>+            this._header.innerText = this.name;
>+    }
>+
>+    _updateView()
>+    {
>+        this._presentSource(this._tokens, this._container);
>+    }
>+
>+    _removeAllChildren(node)
>+    {
>+        while (node.hasChildNodes()) {
>+            node.removeChild(node.lastChild);
>+        }
>+    }
>+
>+    _splitTokensIntoLines(tokens)
>+    {
>+        const lines = [];
>+        let currentLine = [];
>+        lines.push(currentLine);
>+
>+        for (let tok of tokens) {
>+            let tokSections = tok.src.split('\n');
>+            for (let i = 0; i < tokSections.length; i++) {
>+                let tokSection = tokSections[i];
>+
>+                let span = document.createElement('span');
>+                span.innerText = tokSection;
>+                span.className = `code-${tok.type}`;
>+                currentLine.push(span);
>+
>+                if (i != tokSections.length - 1) {
>+                    currentLine = [];
>+                    lines.push(currentLine);
>+                }
>+            }
>+        }
>+
>+        return lines;
>+    }
>+
>+    _presentSource(tokens, container)
>+    {
>+        this._removeAllChildren(container);
>+
>+        this._header = document.createElement('h2');
>+        this._header.innerText = this.name;
>+        container.appendChild(this._header);
>+
>+        const lines = this._splitTokensIntoLines(tokens);
>+
>+        const srcTable = document.createElement('table');
>+        srcTable.className = 'code-source';
>+
>+        for (let i = 0; i < lines.length; i++) {
>+            const currentRow = document.createElement('tr');
>+
>+            const currentLineNumber = document.createElement('td');
>+            currentLineNumber.className = 'line-no';
>+            currentLineNumber.dataset.content = (i + 1).toString(); // line-no shown with CSS
>+            currentRow.appendChild(currentLineNumber);
>+
>+            const currentLineElement = document.createElement('td');
>+            currentLineElement.className = 'line';
>+            for (let span of lines[i]) {
>+                currentLineElement.appendChild(span);
>+            }
>+            currentRow.appendChild(currentLineElement);
>+
>+            srcTable.appendChild(currentRow);
>+        }
>+
>+        container.appendChild(srcTable);
>+
>+        if (this.editable) {
>+            const editButton = document.createElement('input');
>+            editButton.type = "button";
>+            editButton.value = "Edit";
>+            editButton.addEventListener("click", () => this.edit());
>+            container.appendChild(editButton);
>+        }
>+
>+        for (let [name, source] of this.copySources) {
>+            const copyButton = document.createElement('input');
>+            copyButton.type = "button";
>+            copyButton.value = `Copy ${name}`;
>+            copyButton.addEventListener("click", () => {
>+                const fakeTextarea = document.createElement('textarea');
>+                fakeTextarea.value = source;
>+                document.body.appendChild(fakeTextarea);
>+                fakeTextarea.focus();
>+                fakeTextarea.select();
>+                document.execCommand("copy");
>+                document.body.removeChild(fakeTextarea);
>+            });
>+            container.appendChild(copyButton);
>+        }
>+
>+        this._createErrorBox();
>+    }
>+
>+    edit()
>+    {
>+        this._removeAllChildren(this._container);
>+
>+        this._header = document.createElement('h2');
>+        this._header.innerText = this.name;
>+        this._container.appendChild(this._header);
>+
>+        this._textarea = document.createElement('textarea');
>+        this._textarea.value = this.src;
>+        this._container.appendChild(this._textarea);
>+
>+        const compileButton = document.createElement('input');
>+        compileButton.type = "button";
>+        compileButton.value = "Compile";
>+        compileButton.addEventListener("click", () => this.compile());
>+        this._container.appendChild(compileButton);
>+
>+        this._createErrorBox();
>+    }
>+
>+    _createErrorBox()
>+    {
>+        this._errorBox = document.createElement('div');
>+        if (this.errorText) {
>+            this._errorBox.innerText = this.errorText;
>+            this._errorText = null;
>+        }
>+        this._container.appendChild(this._errorBox);
>+    }
>+
>+    compile()
>+    {
>+        let src = this._textarea ? this._textarea.value : this._src;
>+        this._compiler(src);
>+        this.src = src;
>+    }
>+}
>+</script>
>+</head>
>+<body>
>+<table cellspacing="0" cellpadding="0">
>+    <tr>
>+        <td class="container-cell">
>+            <div id="WHLSLInput"></div>
>+        </td>
>+        <td class="container-cell">
>+            <div id="MetalOutput"></div>
>+        </td>
>+    </tr>
>+</table>
>+</body>
>+</html>
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/metal.css b/Tools/WebGPUShadingLanguageRI/Metal/metal.css
>new file mode 100644
>index 0000000000000000000000000000000000000000..d315d02232c6244a8c1597461ee88c00db6d2c55
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/metal.css
>@@ -0,0 +1,113 @@
>+textarea, .code-source {
>+    font-family: "SF Mono", monospace;
>+    font-size: 11pt;
>+    padding: 5px;
>+    width: 800px;
>+    height: 800px;
>+    margin: 1em 0;
>+    display: block;
>+}
>+
>+input[type=button] {
>+    font-size: 16pt;
>+}
>+
>+.code-source {
>+    overflow-x: scroll;
>+    overflow-y: scroll;
>+    border: 1px solid black;
>+    display: block;
>+    background-color: #1F1F24;
>+    color: white;
>+    white-space: nowrap;
>+}
>+
>+td {
>+    border: 1px solid black;
>+}
>+
>+body {
>+    font-family: -apple-system, sans-serif;
>+}
>+
>+h1, h2 {
>+    text-align: center;
>+}
>+
>+table {
>+    width:100%;
>+    border:none;
>+    border-collapse: collapse;
>+
>+}
>+
>+.container-cell {
>+    width:50%;
>+}
>+
>+th, td {
>+    border:none;
>+    vertical-align:top;
>+    margin: 0;
>+    -webkit-border-horizontal-spacing: 0px;
>+    -webkit-border-vertical-spacing: 0px;
>+    border-collapse: collapse;
>+    box-sizing: border-box;
>+    border-spacing: 0;
>+}
>+
>+.code-comment {
>+    color: #9e9e9e;
>+    font-style: italic;
>+    white-space: pre;
>+}
>+
>+.code-comment-note {
>+    color: #F4E218;
>+    font-style: italic;
>+    font-weight:bold;
>+}
>+
>+.code-keyword, .code-type {
>+    color: #FD5FA2;
>+    font-weight: bold;
>+}
>+
>+.code-literal {
>+    color: #9686F5;
>+}
>+
>+.code-attribute {
>+    color: #AEF29D;
>+    font-weight: bold;
>+}
>+
>+.code-whitespace {
>+    white-space: pre;
>+}
>+
>+.code-error {
>+    color: #fc5a3a;
>+    text-decoration: underline;
>+}
>+
>+.code-directive {
>+    color: #FC8F3F;
>+}
>+
>+.line-no {
>+    color: #616065;
>+    text-align: right;
>+    -webkit-user-select:none;
>+    padding-left: 5px;
>+    padding-right: 5px;
>+    border-right: 1px solid #616065;
>+}
>+
>+.line-no::before {
>+    content: attr(data-content);
>+}
>+
>+.line {
>+    padding-left: 5px;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/tsconfig.json b/Tools/WebGPUShadingLanguageRI/Metal/tsconfig.json
>new file mode 100644
>index 0000000000000000000000000000000000000000..04f370c3827a319a7c27e1803f0e4740ed7fcd88
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/tsconfig.json
>@@ -0,0 +1,26 @@
>+{
>+    "version": "2.0.0",
>+    "tasks": [
>+        {
>+            "type": "typescript",
>+            "tsconfig": "tsconfig.json",
>+            "problemMatcher": [
>+                "$tsc"
>+            ],
>+            "group": {
>+                "kind": "build",
>+                "isDefault": true
>+            }
>+        }
>+    ],
>+    "compilerOptions": {
>+        "target": "es6",
>+        "module": "amd",
>+        "sourceMap": true,
>+        "lib": [
>+            "es6"
>+        ],
>+        "types": [],
>+        "outFile": "compiler.js"
>+    }
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/RecursionChecker.js b/Tools/WebGPUShadingLanguageRI/RecursionChecker.js
>index 5981dfbf531242ce9305b9f9a3cfe02c46179cc9..c8f8661947ff533dfa92fac2b03a27dee7715f64 100644
>--- a/Tools/WebGPUShadingLanguageRI/RecursionChecker.js
>+++ b/Tools/WebGPUShadingLanguageRI/RecursionChecker.js
>@@ -33,7 +33,8 @@ class RecursionChecker extends Visitor {
>     
>     visitFuncDef(node)
>     {
>-        this._visiting.doVisit(node, () => super.visitFuncDef(node));
>+        if (this._visiting.shouldVisit(node))
>+            super.visitFuncDef(node);
>     }
>     
>     visitCallExpression(node)
>diff --git a/Tools/WebGPUShadingLanguageRI/StandardLibrary.js b/Tools/WebGPUShadingLanguageRI/StandardLibrary.js
>index 1988723c3548081c667fac7862f40267f9f8b857..f5721027ec469dc3e10b7b62ad6c428b8ba6c003 100644
>--- a/Tools/WebGPUShadingLanguageRI/StandardLibrary.js
>+++ b/Tools/WebGPUShadingLanguageRI/StandardLibrary.js
>@@ -366,6 +366,12 @@ uint operator.length<T, uint length>(T[length])
> {
>     return length;
> }
>+
>+native float log(float);
>+native float pow(float, float);
>+native float sin(float);
>+native float cos(float);
>+native float atan2(float, float);
> `;
> 
> function intToString(x)
>@@ -385,5 +391,4 @@ function intToString(x)
> }
> 
> // There are 481 swizzle operators, so we compile them as native functions
>-standardLibrary += SwizzleOp.allSwizzleOperators().join(";\n") + ";";
>-console.log(standardLibrary);
>\ No newline at end of file
>+standardLibrary += SwizzleOp.allSwizzleOperators().join(";\n") + ";";
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Test.js b/Tools/WebGPUShadingLanguageRI/Test.js
>index 322a0a717850d73290848e93bf95bd3a24241c66..4be2821a16a8e41c04e0665bca985268670082e3 100644
>--- a/Tools/WebGPUShadingLanguageRI/Test.js
>+++ b/Tools/WebGPUShadingLanguageRI/Test.js
>@@ -32,7 +32,7 @@ if (this.window) {
>         window.scrollTo(0,document.body.scrollHeight);
>     };
>     this.preciseTime = () => performance.now() / 1000;
>-} else
>+} else if (this.load)
>     load("All.js");
> 
> function doPrep(code)
>@@ -944,13 +944,13 @@ tests.passNullToPtrPolymorphicArrayRef = function()
> tests.returnIntLiteralUint = function()
> {
>     let program = doPrep("uint foo() { return 42; }");
>-    checkNumber(program, callFunction(program, "foo", [], []), 42);
>+    checkUint(program, callFunction(program, "foo", [], []), 42);
> }
> 
> tests.returnIntLiteralFloat = function()
> {
>     let program = doPrep("float foo() { return 42; }");
>-    checkNumber(program, callFunction(program, "foo", [], []), 42);
>+    checkFloat(program, callFunction(program, "foo", [], []), 42);
> }
> 
> tests.badIntLiteralForInt = function()
>@@ -6572,7 +6572,7 @@ function* doTest(testFilter)
>     print("That took " + (after - before) * 1000 + " ms.");
> }
> 
>-if (!this.window) {
>+if (!this.window && !this.runningInCocoaHost) {
>     Error.stackTraceLimit = Infinity;
>     for (let _ of doTest(testFilter)) { }
> }
>diff --git a/Tools/WebGPUShadingLanguageRI/VisitingSet.js b/Tools/WebGPUShadingLanguageRI/VisitingSet.js
>index f6058f1345f1a56f2419989e61c85d5393daae5d..bdbc6aefd376a2f2041150a0861950f87d8d85d6 100644
>--- a/Tools/WebGPUShadingLanguageRI/VisitingSet.js
>+++ b/Tools/WebGPUShadingLanguageRI/VisitingSet.js
>@@ -29,6 +29,14 @@ class VisitingSet {
>     {
>         this._set = new Set(items);
>     }
>+
>+    shouldVisit(item)
>+    {
>+        if (this._set.has(item))
>+            return false;
>+        this._set.add(item);
>+        return true;
>+    }
>     
>     doVisit(item, callback)
>     {

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Attachments on bug 187738: 345192 | 345267 | 346955 | 347094 | 347104 | 347142 | 348258 | 348410 | 348702 | 349746 | 349818 | 350453 | 350779