Attachment 349823 Details for Bug 189615 – WIP

[patch] WIP

bug-189615-20180914160905.patch (text/plain), 437.32 KB, created by Thomas Denney on 2018-09-14 16:09:11 PDT

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Creator: Thomas Denney

Created: 2018-09-14 16:09:11 PDT

Size: 437.32 KB

patch

obsolete

>Subversion Revision: 236001
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 60dc9bcca816fc13fe430ba3ccf2879b5f8ce42c..4dbfe3d94e4e84da95b4e9eec0d104be09b61057 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,287 @@
>+2018-09-14  Thomas Denney  <tdenney@apple.com>
>+
>+        [WHLSL Implement trap statements in Metal code generation
>+        https://bugs.webkit.org/show_bug.cgi?id=189615
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebGPUShadingLanguageRI/ArrayType.js:
>+        (ArrayType.prototype.get arrayRefType):
>+        * WebGPUShadingLanguageRI/Casts.js:
>+        (castToBool):
>+        (castAndCheckValue):
>+        (isBitwiseEquivalent):
>+        * WebGPUShadingLanguageRI/Intrinsics.js:
>+        (Intrinsics.isBitwiseEquivalent): Deleted.
>+        * WebGPUShadingLanguageRI/MakeArrayRefExpression.js:
>+        (MakeArrayRefExpression):
>+        (MakeArrayRefExpression.prototype.get type):
>+        * WebGPUShadingLanguageRI/Metal/MSLBackend.js: Added.
>+        (MSLBackend):
>+        (MSLBackend.prototype.get program):
>+        (MSLBackend.prototype.get declarations):
>+        (MSLBackend.prototype.get functionSources):
>+        (MSLBackend.prototype.compile):
>+        (MSLBackend.prototype._msl):
>+        (MSLBackend.prototype._findFunctionsToCompile.FindFunctionsThatGetCalled.prototype.visitCallExpression):
>+        (MSLBackend.prototype._findFunctionsToCompile.FindFunctionsThatGetCalled):
>+        (MSLBackend.prototype._findFunctionsToCompile):
>+        (MSLBackend.prototype._createTypeDecls):
>+        (MSLBackend.prototype._createFunctionDecls):
>+        (MSLBackend.prototype._sortTypeDeclarationsInTopologicalOrder.TypeOrderer.prototype.visitStructType):
>+        (MSLBackend.prototype._sortTypeDeclarationsInTopologicalOrder.TypeOrderer.prototype.visitReferenceType):
>+        (MSLBackend.prototype._sortTypeDeclarationsInTopologicalOrder.TypeOrderer):
>+        (MSLBackend.prototype._sortTypeDeclarationsInTopologicalOrder):
>+        (MSLBackend.prototype._removeCommentsAndEmptyLines):
>+        * WebGPUShadingLanguageRI/Metal/MSLCodegenAll.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        * WebGPUShadingLanguageRI/Metal/MSLCompileResult.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (MSLCompileResult):
>+        (MSLCompileResult.prototype.get metalShaderLanguageSource):
>+        (MSLCompileResult.prototype.get error):
>+        (MSLCompileResult.prototype.get originalFunctionNameToMangledNames):
>+        (MSLCompileResult.prototype.get functionSources):
>+        (MSLCompileResult.prototype.get didSucceed):
>+        * WebGPUShadingLanguageRI/Metal/MSLConstexprEmitter.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (MSLConstexprEmitter.prototype.visitIdentityExpression):
>+        (MSLConstexprEmitter.prototype.visitBoolLiteral):
>+        (MSLConstexprEmitter.prototype.visitEnumLiteral):
>+        (MSLConstexprEmitter.prototype.visitGenericLiteral):
>+        (MSLConstexprEmitter.prototype.visitNullLiteral):
>+        (MSLConstexprEmitter):
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.js: Added.
>+        (MSLFunctionDeclaration):
>+        (MSLFunctionDeclaration.prototype.get funcMangler):
>+        (MSLFunctionDeclaration.prototype.get func):
>+        (MSLFunctionDeclaration.prototype.get typeNamer):
>+        (MSLFunctionDeclaration.prototype.get typeAttributes):
>+        (MSLFunctionDeclaration.prototype.get isVertexShader):
>+        (MSLFunctionDeclaration.prototype.get paramMap):
>+        (MSLFunctionDeclaration.prototype.commentLine):
>+        (MSLFunctionDeclaration.prototype.toString):
>+        (MSLFunctionDeclaration.prototype.get isShader):
>+        (MSLFunctionDeclaration.prototype.parameterIsAttribute):
>+        (MSLFunctionDeclaration.prototype.parameterIsVertexId):
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (MSLFunctionDefinition.prototype.toString):
>+        (MSLFunctionDefinition):
>+        * WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (MSLFunctionForwardDeclaration.prototype.toString):
>+        (MSLFunctionForwardDeclaration):
>+        * WebGPUShadingLanguageRI/Metal/MSLInsertTrapParameter.js: Added.
>+        (insertTrapParameter.FindEntryPoints.prototype.visitFuncDef):
>+        (insertTrapParameter.FindEntryPoints):
>+        (insertTrapParameter.FindFunctionsCalledByEntryPoints.prototype.visitCallExpression):
>+        (insertTrapParameter.FindFunctionsCalledByEntryPoints):
>+        (insertTrapParameter.UpdateCallExpressions):
>+        (insertTrapParameter.UpdateCallExpressions.prototype.visitCallExpression):
>+        (insertTrapParameter):
>+        * WebGPUShadingLanguageRI/Metal/MSLNameMangler.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (MSLNameMangler):
>+        (MSLNameMangler.prototype.mangle):
>+        * WebGPUShadingLanguageRI/Metal/MSLNativeFunctionCall.js: Added.
>+        (mslNativeFunctionCall):
>+        * WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.js: Added.
>+        (MSLStatementEmitter):
>+        (MSLStatementEmitter.prototype._emitTrap):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitNativeType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitPtrType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitArrayType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitArrayRefType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitEnumType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitStructType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitVectorType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitMatrixType):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer.prototype.visitTypeRef):
>+        (MSLStatementEmitter.prototype._zeroInitialize.ZeroInitializer):
>+        (MSLStatementEmitter.prototype._zeroInitialize):
>+        (MSLStatementEmitter.):
>+        * WebGPUShadingLanguageRI/Metal/MSLTypeAttributes.js: Copied from Tools/WebGPUShadingLanguageRI/Type.js.
>+        (MSLTypeAttributes):
>+        (MSLTypeAttributes.prototype.get type):
>+        (MSLTypeAttributes.prototype.get isVertexAttribute):
>+        (MSLTypeAttributes.prototype.set isVertexAttribute):
>+        (MSLTypeAttributes.prototype.get isVertexOutputOrFragmentInput):
>+        (MSLTypeAttributes.prototype.set isVertexOutputOrFragmentInput):
>+        (MSLTypeAttributes.prototype.get isFragmentOutput):
>+        (MSLTypeAttributes.prototype.set isFragmentOutput):
>+        (MSLTypeAttributes.prototype.get fieldMangler):
>+        (MSLTypeAttributes.prototype.mangledFieldName):
>+        * WebGPUShadingLanguageRI/Metal/MSLTypeAttributesMap.js: Copied from Tools/WebGPUShadingLanguageRI/Type.js.
>+        (MSLTypeAttributesMap):
>+        (MSLTypeAttributesMap.prototype.attributesForType):
>+        (MSLTypeAttributesMap.prototype._visitVertexShader):
>+        (MSLTypeAttributesMap.prototype._visitFragmentShader):
>+        * WebGPUShadingLanguageRI/Metal/MSLTypeNamer.js: Added.
>+        (MSLTypeNamer):
>+        (MSLTypeNamer.prototype.get typeUnifier):
>+        (MSLTypeNamer.prototype.uniqueTypeId):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitNativeType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitStructType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitEnumType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitReferenceType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitArrayType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitArrayRefType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitVectorType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitTypeRef):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor.prototype.visitMatrixType):
>+        (MSLTypeNamer.prototype.mslTypeName.TypeNameVisitor):
>+        (MSLTypeNamer.prototype.mslTypeName):
>+        * WebGPUShadingLanguageRI/Metal/MSLTypeUnifier.js: Added.
>+        (MSLTypeUnifier):
>+        (MSLTypeUnifier.prototype.get allTypes):
>+        (MSLTypeUnifier.prototype.uniqueTypeId):
>+        (MSLTypeUnifier.prototype.visitTypeRef):
>+        (MSLTypeUnifier.prototype.visitStructType):
>+        (MSLTypeUnifier.prototype.visitEnumType):
>+        (MSLTypeUnifier.prototype.visitNativeType):
>+        (MSLTypeUnifier.prototype.visitPtrType):
>+        (MSLTypeUnifier.prototype.visitArrayType):
>+        (MSLTypeUnifier.prototype.visitArrayRefType):
>+        (MSLTypeUnifier.prototype.visitVectorType):
>+        (MSLTypeUnifier.prototype.visitMakeArrayRefExpression):
>+        (MSLTypeUnifier.prototype.typesThatNeedDeclaration):
>+        * WebGPUShadingLanguageRI/Metal/MSLVarDeclaration.js: Copied from Tools/WebGPUShadingLanguageRI/Type.js.
>+        (mslVarDeclaration):
>+        * WebGPUShadingLanguageRI/Metal/TypeOf.js: Added.
>+        (typeOf.TypeVisitor.prototype.visitAnonymousVariable):
>+        (typeOf.TypeVisitor.prototype.visitArrayRefType):
>+        (typeOf.TypeVisitor.prototype.visitArrayType):
>+        (typeOf.TypeVisitor.prototype.visitAssignment):
>+        (typeOf.TypeVisitor.prototype.visitCallExpression):
>+        (typeOf.TypeVisitor.prototype.visitCommaExpression):
>+        (typeOf.TypeVisitor.prototype.visitConvertPtrToArrayRefExpression):
>+        (typeOf.TypeVisitor.prototype.visitDotExpression):
>+        (typeOf.TypeVisitor.prototype.visitElementalType):
>+        (typeOf.TypeVisitor.prototype.visitEnumType):
>+        (typeOf.TypeVisitor.prototype.visitField):
>+        (typeOf.TypeVisitor.prototype.visitFunc):
>+        (typeOf.TypeVisitor.prototype.visitFuncDef):
>+        (typeOf.TypeVisitor.prototype.visitFuncParameter):
>+        (typeOf.TypeVisitor.prototype.visitFunctionLikeBlock):
>+        (typeOf.TypeVisitor.prototype.visitGenericLiteralType):
>+        (typeOf.TypeVisitor.prototype.visitIdentityExpression):
>+        (typeOf.TypeVisitor.prototype.visitIndexExpression):
>+        (typeOf.TypeVisitor.prototype.visitLogicalExpression):
>+        (typeOf.TypeVisitor.prototype.visitLogicalNot):
>+        (typeOf.TypeVisitor.prototype.visitMakeArrayRefExpression):
>+        (typeOf.TypeVisitor.prototype.visitMakePtrExpression):
>+        (typeOf.TypeVisitor.prototype.visitMatrixType):
>+        (typeOf.TypeVisitor.prototype.visitNativeFunc):
>+        (typeOf.TypeVisitor.prototype.visitNativeFuncInstance):
>+        (typeOf.TypeVisitor.prototype.visitNativeType):
>+        (typeOf.TypeVisitor.prototype.visitNativeTypeInstance):
>+        (typeOf.TypeVisitor.prototype.visitNullLiteral):
>+        (typeOf.TypeVisitor.prototype.visitNullType):
>+        (typeOf.TypeVisitor.prototype.visitPtrType):
>+        (typeOf.TypeVisitor.prototype.visitReadModifyWriteExpression):
>+        (typeOf.TypeVisitor.prototype.visitReferenceType):
>+        (typeOf.TypeVisitor.prototype.visitStructType):
>+        (typeOf.TypeVisitor.prototype.visitTypeDef):
>+        (typeOf.TypeVisitor.prototype.visitTypeRef):
>+        (typeOf.TypeVisitor.prototype.visitVariableDecl):
>+        (typeOf.TypeVisitor.prototype.visitVariableRef):
>+        (typeOf.TypeVisitor.prototype.visitVectorType):
>+        (typeOf.TypeVisitor.prototype.visitBlock):
>+        (typeOf.TypeVisitor.prototype.visitBoolLiteral):
>+        (typeOf.TypeVisitor.prototype.visitBreak):
>+        (typeOf.TypeVisitor.prototype.visitConstexprTypeParameter):
>+        (typeOf.TypeVisitor.prototype.visitContinue):
>+        (typeOf.TypeVisitor.prototype.visitDereferenceExpression):
>+        (typeOf.TypeVisitor.prototype.visitDoWhileLoop):
>+        (typeOf.TypeVisitor.prototype.visitEnumLiteral):
>+        (typeOf.TypeVisitor.prototype.visitEnumMember):
>+        (typeOf.TypeVisitor.prototype.visitForLoop):
>+        (typeOf.TypeVisitor.prototype.visitGenericLiteral):
>+        (typeOf.TypeVisitor.prototype.visitIfStatement):
>+        (typeOf.TypeVisitor.prototype.visitProgram):
>+        (typeOf.TypeVisitor.prototype.visitProtocolDecl):
>+        (typeOf.TypeVisitor.prototype.visitProtocolFuncDecl):
>+        (typeOf.TypeVisitor.prototype.visitProtocolRef):
>+        (typeOf.TypeVisitor.prototype.visitReturn):
>+        (typeOf.TypeVisitor.prototype.visitSwitchCase):
>+        (typeOf.TypeVisitor.prototype.visitSwitchStatement):
>+        (typeOf.TypeVisitor.prototype.visitTrapStatement):
>+        (typeOf.TypeVisitor.prototype.visitWhileLoop):
>+        (typeOf.TypeVisitor):
>+        (typeOf):
>+        * 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/_SharedMetal.txt: 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/WhlslToMsl.js: Copied from Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js.
>+        (whlslToMsl):
>+        * WebGPUShadingLanguageRI/PropertyResolver.js:
>+        (PropertyResolver.visitMakePtrExpression):
>+        * WebGPUShadingLanguageRI/SynthesizeStructAccessors.js:
>+        (synthesizeStructAccessors.setupImplementationData):
>+        * WebGPUShadingLanguageRI/Test.js:
>+        (makeInt):
>+        (makeUint):
>+        (makeUchar):
>+        (makeBool):
>+        (makeFloat):
>+        (makeCastedFloat):
>+        (makeHalf):
>+        (checkInt):
>+        (tests.incrementAndDecrement):
>+        (tests.returnIntLiteralUint):
>+        (tests.returnIntLiteralFloat):
>+        (tests.nestedSubscriptWithArraysInStructs):
>+        (tests.nestedSubscript):
>+        (tests.lotsOfLocalVariables):
>+        (tests.uintBitAnd):
>+        (tests.uintBitOr):
>+        (tests.uintBitXor):
>+        (tests.uintBitNot):
>+        (tests.uintLShift):
>+        (tests.uintRShift):
>+        (tests.ucharBitAnd):
>+        (tests.ucharBitOr):
>+        (tests.ucharBitXor):
>+        (tests.ucharBitNot):
>+        (tests.ucharLShift):
>+        (tests.ucharRShift):
>+        (tests.textureSample):
>+        (checkNumber): Deleted.
>+        (checkEnum): Deleted.
>+        * WebGPUShadingLanguageRI/Type.js:
>+        (Type.prototype.get arrayRefType):
>+
> 2018-09-13  Ryan Haddad  <ryanhaddad@apple.com>
> 
>         Unreviewed, rolling out r235954.
>diff --git a/Tools/WebGPUShadingLanguageRI/ArrayType.js b/Tools/WebGPUShadingLanguageRI/ArrayType.js
>index 0d56a0b375712c4c14bf731196109dff586bab94..b9d918e80cd210a937f238bde4f4668f10689360 100644
>--- a/Tools/WebGPUShadingLanguageRI/ArrayType.js
>+++ b/Tools/WebGPUShadingLanguageRI/ArrayType.js
>@@ -48,6 +48,11 @@ class ArrayType extends Type {
>         return this.numElements.value;
>     }
> 
>+    get arrayRefType()
>+    {
>+        return new ArrayRefType(this.origin, "thread", this.elementType);
>+    }
>+
>     toString()
>     {
>         return this.elementType + "[" + this.numElements + "]";
>diff --git a/Tools/WebGPUShadingLanguageRI/Casts.js b/Tools/WebGPUShadingLanguageRI/Casts.js
>index acbb2ea028535b4670423097f7a5b57caf6b8b1c..c8f08ce69a7f32e8a11a0504352a4052df164d3f 100644
>--- a/Tools/WebGPUShadingLanguageRI/Casts.js
>+++ b/Tools/WebGPUShadingLanguageRI/Casts.js
>@@ -39,6 +39,11 @@ function bitwiseCast(typedArrayConstructor1, typedArrayConstructor2, value)
>     return typedArray2[0];
> }
> 
>+function castToBool(value)
>+{
>+    return !!value;
>+}
>+
> function castToUchar(number)
> {
>     return number & 0xFF;
>@@ -113,3 +118,25 @@ function castToFloat(number)
> {
>     return Math.fround(number);
> }
>+
>+function castAndCheckValue(castFunction, value)
>+{
>+    const castedValue = castFunction(value);
>+    if (!isBitwiseEquivalent(castedValue, value))
>+        throw new Error(`${value} was casted and yielded ${castedValue}, which is not bitwise equivalent.`);
>+    return castedValue;
>+}
>+
>+function isBitwiseEquivalent(left, right)
>+{
>+    let doubleArray = new Float64Array(1);
>+    let intArray = new Int32Array(doubleArray.buffer);
>+    doubleArray[0] = left;
>+    let leftInts = Int32Array.from(intArray);
>+    doubleArray[0] = right;
>+    for (let i = 0; i < 2; ++i) {
>+        if (leftInts[i] != intArray[i])
>+            return false;
>+    }
>+    return true;
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Intrinsics.js b/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>index 1b0a12af4002a90be635e738f1d5e7d90dcb04d3..68b0dd573fc02ea38517955d8388a646aa90a596 100644
>--- a/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>+++ b/Tools/WebGPUShadingLanguageRI/Intrinsics.js
>@@ -34,20 +34,6 @@ class Intrinsics {
>         // For example, if a native function is declared using "int" rather than "int", then we must
>         // use "int" here, since we don't yet know that they are the same type.
> 
>-        function isBitwiseEquivalent(left, right)
>-        {
>-            let doubleArray = new Float64Array(1);
>-            let intArray = new Int32Array(doubleArray.buffer);
>-            doubleArray[0] = left;
>-            let leftInts = Int32Array.from(intArray);
>-            doubleArray[0] = right;
>-            for (let i = 0; i < 2; ++i) {
>-                if (leftInts[i] != intArray[i])
>-                    return false;
>-            }
>-            return true;
>-        }
>-
>         this._map.set(
>             "native typedef void",
>             type => {
>diff --git a/Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js b/Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js
>index 0cc6f6ecd23bf03f0ae223f192b1a07ad443709e..6eb6f27d26ccd27c86f362f3808c5ec5f1ef8a56 100644
>--- a/Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js
>+++ b/Tools/WebGPUShadingLanguageRI/MakeArrayRefExpression.js
>@@ -29,12 +29,13 @@ class MakeArrayRefExpression extends Expression {
>     {
>         super(origin);
>         this._lValue = lValue;
>-        if (this.lValue.variable && this.lValue.variable.type && this.lValue.variable.type.isArray && this.lValue.variable.type.elementType) {
>-            this._type = new ArrayRefType(origin, "thread", this.lValue.variable.type.elementType);
>-        }
>     }
> 
>-    get type() { return this._type; }
>+    get type()
>+    {
>+        return typeOf(this.lValue).arrayRefType;
>+    }
>+
>     get lValue() { return this._lValue; }
> 
>     toString()
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLBackend.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLBackend.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..92e09db95a5d8271dbc2ac9368bdb320f3197172
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLBackend.js
>@@ -0,0 +1,252 @@
>+/*
>+ * 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 MSLCompileResult 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 MSLBackend {
>+
>+    constructor(program)
>+    {
>+        this._program = program;
>+        this._declarations = [];
>+        this._funcNameMangler = new MSLNameMangler("F");
>+        this._typeUnifier = new MSLTypeUnifier();
>+        this._typeNamer = new MSLTypeNamer(this._typeUnifier);
>+        this._forwardTypeDecls = [];
>+        this._typeDefinitions = [];
>+        this._forwardFunctionDecls = [];
>+        this._functionDefintions = [];
>+    }
>+
>+    get program()
>+    {
>+        return this._program;
>+    }
>+
>+    get declarations()
>+    {
>+        return this._declarations;
>+    }
>+
>+    get functionSources()
>+    {
>+        return this._functionSources;
>+    }
>+
>+    compile()
>+    {
>+        try {
>+            const src = this._msl();
>+            const mangledMap = {};
>+            for (let func of this._functionDefintions) {
>+                const key = func.func.name;
>+                const value = this._funcNameMangler.mangle(func.func);
>+                mangledMap[key] = value;
>+            }
>+
>+            return new MSLCompileResult(src, null, mangledMap, this._functionSources);
>+        } catch (e) {
>+            return new MSLCompileResult(null, e, null, null);
>+        }
>+    }
>+
>+    _msl()
>+    {
>+        insertTrapParameter(this.program);
>+
>+        const functionsToCompile = this._findFunctionsToCompile();
>+        for (let func of functionsToCompile)
>+            func.visit(this._typeUnifier);
>+
>+        this._allTypeAttributes = new MSLTypeAttributesMap(functionsToCompile, this._typeUnifier);
>+        this._createTypeDecls();
>+        this._createFunctionDecls(functionsToCompile);
>+
>+        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);
>+        addSection("Forward function declarations", this._forwardFunctionDecls);
>+        addSection("Function definitions", this._functionDefintions);
>+
>+        if (!this._allowComments)
>+            outputStr = this._removeCommentsAndEmptyLines(outputStr);
>+
>+        return outputStr;
>+    }
>+
>+    _findFunctionsToCompile()
>+    {
>+        const entryPointFunctions = [];
>+        for (let [name, instances] of this._program.functions) {
>+            for (let instance of instances) {
>+                if (instance.isEntryPoint)
>+                    entryPointFunctions.push(instance);
>+            }
>+        }
>+        const functions = new Set(entryPointFunctions);
>+
>+        class FindFunctionsThatGetCalled extends Visitor {
>+            visitCallExpression(node)
>+            {
>+                super.visitCallExpression(node);
>+                if (node.func instanceof FuncDef) {
>+                    functions.add(node.func);
>+                    node.func.visit(this);
>+                }
>+            }
>+        }
>+        const findFunctionsThatGetCalledVisitor = new FindFunctionsThatGetCalled();
>+        for (let entryPoint of entryPointFunctions)
>+            entryPoint.visit(findFunctionsThatGetCalledVisitor);
>+        return Array.from(functions);
>+    }
>+
>+    _createTypeDecls()
>+    {
>+        const typesThatNeedDeclaration = this._typeUnifier.typesThatNeedDeclaration();
>+        const typeDeclsInOrder = this._sortTypeDeclarationsInTopologicalOrder(typesThatNeedDeclaration);
>+
>+        for (let type of typeDeclsInOrder) {
>+            if (type instanceof StructType) {
>+                this._forwardTypeDecls.push(this._metalSourceForStructForwardDeclaration(type, this._typeNamer));
>+                this._typeDefinitions.push(this._metalSourceForStructDefinition(type, this._typeNamer, this._allTypeAttributes.attributesForType(type)));
>+            } else if (type instanceof ArrayRefType) {
>+                this._forwardTypeDecls.push(this._metalSourceForArrayRefForwardDeclaration(type, this._typeNamer));
>+                this._typeDefinitions.push(this._metalSourceForArrayRefDefinition(type, this._typeNamer));
>+            } else
>+                throw new Error(`${type} cannot be declared in Metal`);
>+        }
>+    }
>+
>+    _createFunctionDecls(unifiedFunctionDefs)
>+    {
>+        for (let func of unifiedFunctionDefs) {
>+            this._forwardFunctionDecls.push(new MSLFunctionForwardDeclaration(this._funcNameMangler, func, this._typeNamer, this._allTypeAttributes));
>+            this._functionDefintions.push(new MSLFunctionDefinition(this._funcNameMangler, func, this._typeNamer, this._allTypeAttributes));
>+        }
>+    }
>+
>+    _sortTypeDeclarationsInTopologicalOrder(typesToDeclare)
>+    {
>+        const declarations = new Array();
>+        for (let type of typesToDeclare)
>+            declarations.push(type);
>+
>+        let typeOrder = [];
>+        let visitedSet = new Set();
>+        const typeUnifier = this._typeUnifier;
>+        class TypeOrderer extends Visitor {
>+            visitStructType(node)
>+            {
>+                const id = typeUnifier.uniqueTypeId(node);
>+                if (!visitedSet.has(id)) {
>+                    typeOrder.push(node);
>+                    super.visitStructType(node);
>+                }
>+                visitedSet.add(id);
>+            }
>+
>+            // An empty implementation ensures that we don't recurse into the element type and needlessly create dependencies.
>+            visitReferenceType(node) {}
>+        }
>+        const typeOrderer = new TypeOrderer();
>+        for (let type of typesToDeclare)
>+            type.visit(typeOrderer);
>+        typeOrder = typeOrder.reverse();
>+
>+        const typeOrderMap = new Map();
>+        for (let i = 0; i < typeOrder.length; i++)
>+            typeOrderMap.set(typeOrder[i], i);
>+
>+        return declarations.sort((a, b) => typeOrderMap.get(a) - typeOrderMap.get(b));
>+    }
>+
>+    // Also removes #pragma marks.
>+    _removeCommentsAndEmptyLines(src)
>+    {
>+        const singleLineCommentRegex = /(\/\/|\#pragma)(.*?)($|\n)/;
>+        const lines = src.split('\n')
>+            .map(line => line.replace(singleLineCommentRegex, '').trimEnd())
>+            .filter(line => line.length > 0);
>+        return lines.join('\n');
>+    }
>+
>+    _metalSourceForArrayRefDefinition(arrayRefType, typeNamer)
>+    {
>+        let src = `struct ${typeNamer.uniqueTypeId(arrayRefType)} {\n`;
>+        const fakePtrType = new PtrType(arrayRefType.origin, arrayRefType.addressSpace, arrayRefType.elementType);
>+        src += `    ${mslVarDeclaration(typeNamer, fakePtrType, "ptr")};\n`;
>+        src += "    uint32_t length;\n";
>+        src += "};";
>+        return src;
>+    }
>+
>+    _metalSourceForArrayRefForwardDeclaration(arrayRefType, typeNamer)
>+    {
>+        return `struct ${typeNamer.uniqueTypeId(arrayRefType)};`;
>+    }
>+
>+    _metalSourceForStructForwardDeclaration(structType, typeNamer)
>+    {
>+        return `struct ${typeNamer.uniqueTypeId(structType)};`;
>+    }
>+
>+    _metalSourceForStructDefinition(structType, typeNamer, structTypeAttributes)
>+    {
>+        let src = `struct ${typeNamer.uniqueTypeId(structType)} {\n`;
>+
>+        let index = 0;
>+        for (let [fieldName, field] of structType.fieldMap) {
>+            const mangledFieldName = structTypeAttributes.mangledFieldName(fieldName);
>+            src += `    ${mslVarDeclaration(typeNamer, field.type, mangledFieldName)}`;
>+
>+            const annotations = [];
>+            if (structTypeAttributes.isVertexAttribute)
>+                annotations.push(`attribute(${index++})`);
>+            if (structTypeAttributes.isVertexOutputOrFragmentInput && fieldName === "wsl_Position")
>+                annotations.push("position");
>+            if (structTypeAttributes.isFragmentOutput && fieldName === "wsl_Color")
>+                annotations.push("color(0)");
>+            if (annotations.length)
>+                src += ` [[${annotations.join(", ")}]]`;
>+            src += ";\n";
>+        }
>+
>+        src += "};";
>+
>+        return src;
>+    }
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLCodegenAll.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLCodegenAll.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..3709fa800f1965e19aff6e758fa46a8cb51fd867
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLCodegenAll.js
>@@ -0,0 +1,42 @@
>+/*
>+ * 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.
>+ */
>+
>+load("MSLBackend.js");
>+load("MSLCompileResult.js");
>+load("MSLConstexprEmitter.js");
>+load("MSLFunctionDeclaration.js");
>+load("MSLFunctionDefinition.js");
>+load("MSLFunctionForwardDeclaration.js");
>+load("MSLInsertTrapParameter.js");
>+load("MSLNameMangler.js");
>+load("MSLNativeFunctionCall.js");
>+load("MSLStatementEmitter.js");
>+load("MSLTypeAttributesMap.js");
>+load("MSLTypeAttributes.js");
>+load("MSLTypeNamer.js");
>+load("MSLTypeUnifier.js");
>+load("MSLVarDeclaration.js");
>+load("TypeOf.js");
>+load("WhlslToMsl.js");
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLCompileResult.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLCompileResult.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..2fd0bb892b669e79b730c790f453ae5a29346d0c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLCompileResult.js
>@@ -0,0 +1,60 @@
>+/*
>+ * 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 MSLCompileResult {
>+
>+    constructor(src, err, mangledNameMap, functionSources)
>+    {
>+        this._metalShaderLanguageSource = src;
>+        this._error = err;
>+        this._originalFunctionNameToMangledNames = mangledNameMap;
>+        this._functionSources = functionSources;
>+    }
>+
>+    get metalShaderLanguageSource()
>+    {
>+        return this._metalShaderLanguageSource;
>+    }
>+
>+    get error()
>+    {
>+        return this._error;
>+    }
>+
>+    get originalFunctionNameToMangledNames()
>+    {
>+        return this._originalFunctionNameToMangledNames;
>+    }
>+
>+    get functionSources()
>+    {
>+        return this._functionSources;
>+    }
>+
>+    get didSucceed()
>+    {
>+        return !this.error;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLConstexprEmitter.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLConstexprEmitter.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..5d343286cfd2f38a43e83c49059804478bbfe9d1
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLConstexprEmitter.js
>@@ -0,0 +1,54 @@
>+/*
>+ * 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 MSLConstexprEmitter extends Visitor
>+{
>+    visitIdentityExpression(node)
>+    {
>+        return node.target.visit(this);
>+    }
>+
>+    visitBoolLiteral(node)
>+    {
>+        return node.value.toString();
>+    }
>+
>+    visitEnumLiteral(node)
>+    {
>+        return node.member.value.visit(this);
>+    }
>+
>+    visitGenericLiteral(node)
>+    {
>+        // FIXME: What happens in the case of halfs/floats/etc
>+        return node.value.toString();
>+    }
>+
>+    visitNullLiteral(node)
>+    {
>+        return "nullptr";
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..de39a49fb8436ea5bab642b1a22e07688e9f706e
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDeclaration.js
>@@ -0,0 +1,124 @@
>+/*
>+ * 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 {
>+
>+    constructor(funcMangler, funcDef, typeNamer, typeAttributes)
>+    {
>+        this._funcMangler = funcMangler;
>+        this._func = funcDef;
>+        this._typeNamer = typeNamer;
>+        this._typeAttributes = typeAttributes;
>+    }
>+
>+    get funcMangler()
>+    {
>+        return this._funcMangler;
>+    }
>+
>+    get func()
>+    {
>+        return this._func;
>+    }
>+
>+    get typeNamer()
>+    {
>+        return this._typeNamer;
>+    }
>+
>+    get typeAttributes()
>+    {
>+        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, `P${counter++}`);
>+        return map;
>+    }
>+
>+    commentLine()
>+    {
>+        const params = [];
>+        for (let param of this.paramMap.keys())
>+            params.push(param.name);
>+        return `// ${this._func.name}(${params.join(", ")}) @ ${this._func.origin.originString}\n`;
>+    }
>+
>+    toString()
>+    {
>+        let declLine = this.commentLine();
>+
>+        if (this.isShader)
>+            declLine += `${this._func.shaderType} `;
>+        declLine += `${this._typeNamer.mslTypeName(this._func.returnType)} `;
>+        declLine += this._funcMangler.mangle(this.func);
>+        declLine += "("
>+
>+        let params = [];
>+        const paramMap = this.paramMap;
>+        for (let param of this._func.parameters) {
>+            let pStr = mslVarDeclaration(this._typeNamer, param.type, paramMap.get(param), true);
>+            // 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;
>+    }
>+
>+    get isShader()
>+    {
>+        // FIXME: Support WHLSL "compute" shaders (MSL calls these kernel shaders)
>+        return this.func.shaderType === "vertex" || this.func.shaderType === "fragment";
>+    }
>+
>+    parameterIsAttribute(node)
>+    {
>+        // We currently assuming that all parameters to entry points are attributes.
>+        // TODO: Better logic for this, i.e. support samplers.
>+        return this.isShader;
>+    }
>+
>+    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.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..0d2878a94a619096c2846280f78d22b83a98251a
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionDefinition.js
>@@ -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.typeAttributes);
>+        src += emitter.indentedSource();
>+        src += "}";
>+        return src;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..57c6f81353c1f381f967345f8987f3cfb91da518
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLFunctionForwardDeclaration.js
>@@ -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/MSLInsertTrapParameter.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLInsertTrapParameter.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..ca40d5265f621e3ae54e49aff6744165a24cec4b
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLInsertTrapParameter.js
>@@ -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.
>+ */
>+
>+function insertTrapParameter(program)
>+{
>+    const entryPointFunctions = new Set();
>+    class FindEntryPoints extends Visitor {
>+        visitFuncDef(node)
>+        {
>+            if (node.isEntryPoint)
>+                entryPointFunctions.add(node);
>+        }
>+    }
>+    program.visit(new FindEntryPoints());
>+    
>+    const functionsCalledByEntryPoints = new Set();
>+    class FindFunctionsCalledByEntryPoints extends Visitor {
>+        visitCallExpression(node)
>+        {
>+            super.visitCallExpression(node);
>+            if (node.func instanceof FuncDef && !functionsCalledByEntryPoints.has(node.func)) {
>+                functionsCalledByEntryPoints.add(node.func);
>+                node.func.visit(this);
>+            }
>+        }
>+    }
>+    program.visit(new FindFunctionsCalledByEntryPoints());
>+    
>+    for (let entryPoint of entryPointFunctions) {
>+        const trapVariable = new VariableDecl(entryPoint.origin, null, program.types.get("bool"), new BoolLiteral(entryPoint.origin, true));
>+        entryPoint.body.statements.unshift(trapVariable);
>+        entryPoint._trapPointerExpression = new MakePtrExpression(entryPoint.origin, VariableRef.wrap(trapVariable));
>+    }
>+    
>+    for (let func of functionsCalledByEntryPoints) {
>+        const trapParameter = new FuncParameter(func.origin, null, new PtrType(func.origin, "thread", TypeRef.wrap(program.types.get("bool"))));
>+        func.parameters.push(trapParameter);
>+        func._trapPointerExpression = VariableRef.wrap(trapParameter);
>+    }
>+    
>+    const visitedFunctions = new Set();
>+    class UpdateCallExpressions extends Visitor {
>+        constructor(caller)
>+        {
>+            super();
>+            this._caller = caller;
>+            if (!visitedFunctions.has(this._caller)) {
>+                visitedFunctions.add(this._caller);
>+                caller.visit(this);
>+            }
>+        }
>+        
>+        visitCallExpression(node)
>+        {
>+            super.visitCallExpression(node);
>+            if (node.func instanceof FuncDef) {
>+                node.argumentList.push(this._caller._trapPointerExpression);
>+                new UpdateCallExpressions(node.func);
>+            }
>+        }
>+    }
>+    
>+    for (let entryPoint of entryPointFunctions)
>+        new UpdateCallExpressions(entryPoint);
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLNameMangler.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLNameMangler.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..49a30df91f821748132329629e5b55a520206bb1
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLNameMangler.js
>@@ -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.
>+ */
>+
>+class MSLNameMangler {
>+
>+    constructor(prefix)
>+    {
>+        this._prefix = prefix;
>+        this._counter = 0;
>+        this._mangledNameMap = new Map();
>+    }
>+
>+    mangle(key)
>+    {
>+        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/MSLNativeFunctionCall.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLNativeFunctionCall.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..2ab8717fcd1ad70757fbf0a879cec91225813ccd
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLNativeFunctionCall.js
>@@ -0,0 +1,82 @@
>+/*
>+ * 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.
>+ */
>+
>+"use strict";
>+
>+function mslNativeFunctionCall(node, resultVariable, args)
>+{
>+    const key = node.toString();
>+
>+    // FIXME: Implement the sampling functions.
>+    // FIXME: Implement functions like f16tof32, asfloat, etc.
>+    // FIXME: Implement tests for all native functions https://bugs.webkit.org/show_bug.cgi?id=189535.
>+    const functionsWithTheSameCallingConvention = {
>+        "native bool isfinite(float)" : "isfinite",
>+        "native bool isinf(float)" : "isinf",
>+        "native bool isnormal(float)" : "isnormal",
>+        "native bool isnormal(half)" : "isnormal",
>+        "native float acos(float)" : "acos",
>+        "native float asfloat(int)" : "static_cast<float>",
>+        "native float asfloat(uint)" : "static_cast<float>",
>+        "native int asint(float)" : "static_cast<int>",
>+        "native uint asuint(float)" : "static_cast<uint>",
>+        "native float asin(float)" : "asin",
>+        "native float atan(float)" : "atan",
>+        "native float atan2(float,float)" : "atan2",
>+        "native float ceil(float)" : "ceil",
>+        "native float cos(float)" : "cos",
>+        "native float cosh(float)" : "cosh",
>+        "native float ddx(float)" : "dfdx",
>+        "native float ddy(float)" : "dfdy",
>+        "native float exp(float)" : "exp",
>+        "native float floor(float)" : "floor",
>+        "native float log(float)" : "log",
>+        "native float pow(float,float)" : "pow",
>+        "native float round(float)" : "round",
>+        "native float sin(float)" : "sin",
>+        "native float sinh(float)" : "sinh",
>+        "native float sqrt(float)" : "sqrt",
>+        "native float tan(float)" : "tan",
>+        "native float tanh(float)" : "tanh",
>+        "native float trunc(float)" : "trunc",
>+    };
>+
>+    if (key in functionsWithTheSameCallingConvention) {
>+        const callString = `${functionsWithTheSameCallingConvention[key]}(${args.join(", ")})`;
>+        if (resultVariable)
>+            return `${resultVariable} = ${callString};`;
>+        else
>+            return `${callString};`;
>+    }
>+
>+    const functionsWithDifferentCallingConventions = {
>+        "native uint f32tof16(float)" : () => `${resultVariable} = uint(static_cast<ushort>(half(${args[0]})));`,
>+        "native float f16tof32(uint)" : () => `${resultVariable} = float(static_cast<half>(ushort(${args[0]})));`
>+    };
>+    if (key in functionsWithDifferentCallingConventions)
>+        return functionsWithDifferentCallingConventions[key]();
>+
>+    throw new Error(`${node} doesn't have mapping to a native Metal function.`);
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..7b23f299b1e927f0d125cd99fc54501a95669165
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLStatementEmitter.js
>@@ -0,0 +1,763 @@
>+/*
>+ * 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 {
>+
>+    constructor(funcMangler, typeNamer, func, paramMap, debugName, typeAttributes)
>+    {
>+        super();
>+        this._funcMangler = funcMangler;
>+        this._typeNamer = typeNamer;
>+        this._func = func;
>+        this._nameMap = paramMap;
>+        this._debugName = debugName;
>+        this._typeAttributes = typeAttributes;
>+        this._counter = 0;
>+        this._indentLevel = 0;
>+        this._lines = [];
>+
>+        this._loopConditionVariableStack = [];
>+        this._loopConditionNodeStack = [];
>+        this._loopIncrementNodeStack = [];
>+
>+        this._actualResult = this._func.visit(this);
>+    }
>+
>+    _emitTrap(setTrapValue)
>+    {
>+        if (!this._func.isEntryPoint && setTrapValue) {
>+            // No need to update this if in an entry point, we can just return zero.
>+            this._add(`*(${this._func._trapPointerExpression.visit(this)}) = false;`);
>+        }
>+        if (this._func.returnType.name !== "void") {
>+            const id = this._fresh();
>+            this._add(mslVarDeclaration(this._typeNamer, this._func.returnType, id) + ";");
>+            this._zeroInitialize(this._func.returnType, id);
>+            this._add(`return ${id};`);
>+        } else
>+            this._add("return;");
>+    }
>+
>+    _zeroInitialize(type, variableName, allowComment = true)
>+    {
>+        const emitter = this;
>+
>+        class ZeroInitializer extends Visitor {
>+            visitNativeType(node)
>+            {
>+                if (node.name == "bool")
>+                    emitter._add(`${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);
>+
>+                for (let field of node.fields) {
>+                    const fieldName = typeAttributes.mangledFieldName(field.name);
>+                    emitter._zeroInitialize(field.type, `${variableName}.${fieldName}`, false);
>+                }
>+            }
>+
>+            visitVectorType(node)
>+            {
>+                const elementNames = [ "x", "y", "z", "w" ];
>+                for (let i = 0; i < node.numElementsValue; i++)
>+                    emitter._add(`${variableName}.${elementNames[i]} = 0;`);
>+            }
>+
>+            visitMatrixType(node)
>+            {
>+                for (let i = 0; i < node.numRowsValue; i++) {
>+                    for (let j = 0; j < node.numRowsValue; j++)
>+                        emitter._zeroInitialize(node.elementType, `${variableName}[${i}][${j}]`, false);
>+                }
>+            }
>+
>+            visitTypeRef(node)
>+            {
>+                node.type.visit(this);
>+            }
>+        }
>+        if (allowComment)
>+            this._add(`// Zero initialization of ${variableName}`);
>+        Node.visit(type, new ZeroInitializer());
>+    }
>+
>+    get actualResult()
>+    {
>+        return this._actualResult;
>+    }
>+
>+    get lines()
>+    {
>+        return this._lines;
>+    }
>+
>+    indentedSource()
>+    {
>+        return this._lines.map(line => "    " + line + "\n").join("");
>+    }
>+
>+    get _loopConditionVariable()
>+    {
>+        return this._loopConditionVariableStack[this._loopConditionVariableStack.length - 1];
>+    }
>+
>+    get _loopCondition()
>+    {
>+        return this._loopConditionNodeStack[this._loopConditionNodeStack.length - 1];
>+    }
>+
>+    get _loopIncrement()
>+    {
>+        return this._loopIncrementNodeStack[this._loopIncrementNodeStack.length - 1];
>+    }
>+
>+    _add(linesString)
>+    {
>+        for (let line of linesString.split('\n')) {
>+            for (let i = 0; i < this._indentLevel; i++)
>+                line = "    " + line;
>+            this._lines.push(line);
>+        }
>+    }
>+
>+    _addLines(lines)
>+    {
>+        for (let line of lines)
>+            this._add(line);
>+    }
>+
>+    _fresh()
>+    {
>+        return `V${this._counter++}`;
>+    }
>+
>+    _indent(closure)
>+    {
>+        this._indentLevel++;
>+        const result = closure();
>+        this._indentLevel--;
>+        return result;
>+    }
>+
>+    // 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)
>+    {
>+        for (let statement of block.statements) {
>+            this._add(`// ${this._debugName} @ ${statement.origin.originString}`);
>+            statement.visit(this);
>+        }
>+    }
>+
>+    visitReturn(node)
>+    {
>+        const expr = node.value.visit(this);
>+        this._add(`return ${expr};`);
>+    }
>+
>+    _visitAndIndent(node)
>+    {
>+        return this._indent(() => node.visit(this));
>+    }
>+
>+    visitIfStatement(node)
>+    {
>+        let condition = node.conditional.visit(this);
>+        this._add(`if (${condition}) {`);
>+        this._visitAndIndent(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._visitAndIndent(node.elseBody);
>+            this._add('}');
>+        } else
>+            this._add('}');
>+    }
>+
>+    visitIdentityExpression(node)
>+    {
>+        return node.target.visit(this);
>+    }
>+
>+    visitLogicalNot(node)
>+    {
>+        const type = typeOf(node);
>+        let expr = Node.visit(node.operand, this);
>+        let id = this._fresh();
>+        this._add(mslVarDeclaration(this._typeNamer, type, id) + ";");
>+        this._add(`${id} = !(${expr});`);
>+        return id;
>+    }
>+
>+    visitDereferenceExpression(node)
>+    {
>+        return `(*(${node.ptr.visit(this)}))`;
>+    }
>+
>+    _isOperatorAnder(node)
>+    {
>+        const anderRegex = /^operator\&\.(.*?)$/;
>+        return node instanceof NativeFunc && anderRegex.test(node.name);
>+    }
>+
>+    _isOperatorGetter(node)
>+    {
>+        const getterRegex = /^operator\.(.*?)$/;
>+        return node instanceof NativeFunc && getterRegex.test(node.name);
>+    }
>+
>+    _isOperatorIndexer(node)
>+    {
>+        return node instanceof NativeFunc && node.name == "operator&[]";
>+    }
>+
>+    _isOperatorSetter(node)
>+    {
>+        const setterRegex = /^operator\.(.*?)=$/;
>+        return node instanceof NativeFunc && setterRegex.test(node.name)
>+    }
>+
>+    _isOperatorCast(node)
>+    {
>+        return node instanceof NativeFunc && node.name == "operator cast";
>+    }
>+
>+    _isUnaryOperator(node)
>+    {
>+        const operatorRegex = /^operator\~$/;
>+        return node instanceof NativeFunc && operatorRegex.test(node.name);
>+    }
>+
>+    _isBinaryOperator(node)
>+    {
>+        const operatorRegex = /operator(\+|\-|\*|\/|\^|\&|\||\&\&|\|\||\<\<|\>\>|\<|\<\=|\>|\>\=|\=\=|\!\=)$/;
>+        return node instanceof NativeFunc && operatorRegex.test(node.name);
>+    }
>+
>+    _isOperatorValue(node)
>+    {
>+        return node instanceof NativeFunc && node.name == "operator.value";
>+    }
>+
>+    _isOperatorLength(node)
>+    {
>+        return node instanceof NativeFunc && node.name == "operator.length";
>+    }
>+
>+    _extractOperatorName(node)
>+    {
>+        return node.name.substring("operator".length);
>+    }
>+
>+    visitVariableDecl(node)
>+    {
>+        let id = this._fresh();
>+        this._nameMap.set(node, id);
>+
>+        this._add(`${mslVarDeclaration(this._typeNamer, node.type, id)}; // ${node.name}`);
>+
>+        if (node.initializer) {
>+            let expr = node.initializer.visit(this);
>+            this._add(`${id} = ${expr};`);
>+        } else
>+            this._zeroInitialize(node.type, id);
>+    }
>+
>+    visitVariableRef(node)
>+    {
>+        if (!this._nameMap.has(node.variable))
>+            throw new Error(`${node.variable} not found in this function's (${this._func.name}) variable map`);
>+        return this._nameMap.get(node.variable);
>+    }
>+
>+    visitMakeArrayRefExpression(node)
>+    {
>+        const elemName = Node.visit(node.lValue, this);
>+        const arrayType = typeOf(node.lValue);
>+        const id = this._fresh();
>+        this._add(mslVarDeclaration(this._typeNamer, node.type, id) + ";");
>+        this._add(`${id}.length = ${node.numElements.value};`);
>+        if (arrayType.isArray)
>+            this._add(`${id}.ptr = ${elemName};`);
>+        else
>+            this._add(`${id}.ptr = &(${elemName});`);
>+        return id;
>+    }
>+
>+    visitConvertPtrToArrayRefExpression(node)
>+    {
>+        const lValue = node.lValue.visit(this);
>+        const type = typeOf(node);
>+        const id = this._fresh();
>+        this._add(mslVarDeclaration(this._typeNamer, type, id) + ";");
>+        this._add(`${id}.length = 1;`);
>+        this._add(`${id}.ptr = ${lValue};`);
>+        return id;
>+    }
>+
>+    visitAnonymousVariable(node)
>+    {
>+        let id = this._fresh();
>+        this._nameMap.set(node, id);
>+        this._add(mslVarDeclaration(this._typeNamer, node.type, id) + `; // ${node.name}`);
>+        this._zeroInitialize(node.type, id);
>+        return id;
>+    }
>+
>+    visitAssignment(node)
>+    {
>+        const lhs = Node.visit(node.lhs, this);
>+        const rhs = Node.visit(node.rhs, this);
>+        this._add(`${lhs} = ${rhs};`);
>+        return lhs;
>+    }
>+
>+    visitCommaExpression(node)
>+    {
>+        let result;
>+        for (let expr of node.list)
>+            result = Node.visit(expr, this);
>+        return result;
>+    }
>+
>+    visitCallExpression(node)
>+    {
>+        const args = [];
>+        for (let i = node.argumentList.length; i--;)
>+            args.unshift(node.argumentList[i].visit(this));
>+
>+        let resultVariable;
>+        if (node.func.returnType.name !== "void") {
>+            resultVariable = this._fresh();
>+            this._add(`// Result variable for call ${node.func.name}(${args.join(", ")})`);
>+            this._add(`${mslVarDeclaration(this._typeNamer, node.resultType, resultVariable)};`);
>+        }
>+
>+        if (node.func instanceof FuncDef) {
>+            const mangledCallName = this._funcMangler.mangle(node.func);
>+            const callString = `${mangledCallName}(${args.join(", ")})`;
>+            if (resultVariable)
>+                this._add(`${resultVariable} = ${callString};`);
>+            else
>+                this._add(`${callString};`);
>+            
>+            this._add(`if (!(*(${this._func._trapPointerExpression.visit(this)}))) {`);
>+            this._indent(() => this._emitTrap(false));
>+            this._add("}");
>+        } else
>+            this._makeNativeFunctionCall(node.func, resultVariable, args);
>+
>+        return resultVariable;
>+    }
>+
>+    _makeNativeFunctionCall(node, resultVariable, args)
>+    {
>+        if (!(node instanceof NativeFunc))
>+            throw new Error(`${node} should be a native function.`);
>+
>+        if (this._isOperatorAnder(node))
>+            this._emitOperatorAnder(node, resultVariable, args);
>+        else if (node.implementationData instanceof BuiltinVectorGetter)
>+            this._emitBuiltinVectorGetter(node, resultVariable, args);
>+        else if (node.implementationData instanceof BuiltinVectorSetter)
>+            this._emitBuiltinVectorSetter(node, resultVariable, args);
>+        else if (node.implementationData instanceof BuiltinMatrixGetter)
>+            this._emitBuiltinMatrixGetter(node, resultVariable, args);
>+        else if (node.implementationData instanceof BuiltinMatrixSetter)
>+            this._emitBuiltinMatrixSetter(node, resultVariable, args);
>+        else if (this._isOperatorValue(node))
>+            this._add(`${resultVariable} = ${args[0]};`);
>+        else if (this._isOperatorLength(node))
>+            this._emitOperatorLength(node, resultVariable, args);
>+        else if (this._isOperatorSetter(node))
>+            this._emitOperatorSetter(node, resultVariable, args);
>+        else if (this._isOperatorGetter(node))
>+            this._emitOperatorGetter(node, resultVariable, args);
>+        else if (this._isOperatorIndexer(node))
>+            this._emitOperatorIndexer(node, resultVariable, args);
>+        else if (this._isOperatorCast(node))
>+            this._emitOperatorCast(node, resultVariable, args);
>+        else if (this._isUnaryOperator(node))
>+            this._add(`${resultVariable} = ${this._extractOperatorName(node)}(${args[0]});`);
>+        else if (this._isBinaryOperator(node))
>+            this._add(`${resultVariable} = ${args[0]} ${this._extractOperatorName(node)} ${args[1]};`);
>+        else
>+            this._add(mslNativeFunctionCall(node, resultVariable, args));
>+
>+        return resultVariable;
>+    }
>+
>+    _emitCallToMetalFunction(name, result, args)
>+    {
>+        this._add(`${result} = ${name}(${args.join(", ")});`);
>+    }
>+
>+    _emitBuiltinVectorGetter(node, result, args)
>+    {
>+        this._add(`${result} = ${args[0]}.${node.implementationData.elementName};`);
>+    }
>+
>+    _emitBuiltinVectorSetter(node, result, args)
>+    {
>+        this._add(`${result} = ${args[0]};`);
>+        this._add(`${result}.${node.implementationData.elementName} = ${args[1]};`);
>+    }
>+
>+    _emitBuiltinMatrixGetter(node, result, args)
>+    {
>+        this._add(`if (${args[1]} >= ${node.implementationData.height}) {`);
>+        this._indent(() => this._emitTrap(true));
>+        this._add('}');
>+        this._add(`${result} = ${args[0]}[${args[1]}];`);
>+    }
>+
>+    _emitBuiltinMatrixSetter(node, result, args)
>+    {
>+        this._add(`if (${args[1]} >= ${node.implementationData.height}) {`);
>+        this._indent(() => this._emitTrap(true));
>+        this._add('}');
>+        this._add(`${result} = ${args[0]};`);
>+        this._add(`${result}[${args[1]}] = ${args[2]};`);
>+    }
>+
>+    _emitOperatorLength(node, result, args)
>+    {
>+        const paramType = typeOf(node.parameters[0]);
>+        if (paramType instanceof ArrayRefType)
>+            this._add(`${result} = ${args[0]}.length;`);
>+        else if (paramType instanceof ArrayType)
>+            this._add(`${result} = ${paramType.numElements.visit(this)};`);
>+        else
>+            throw new Error(`Unhandled paramter type ${paramType} for operator.length`);
>+    }
>+
>+    _emitOperatorCast(node, result, args)
>+    {
>+        const retType = this._typeNamer.mslTypeName(node.returnType);
>+        this._add(`${result} = ${retType}(${args.join(", ")});`);
>+    }
>+
>+    _emitOperatorIndexer(node, result, args)
>+    {
>+        if (!(typeOf(node.parameters[0]) instanceof ArrayRefType))
>+            throw new Error(`Support for operator&[] ${node.parameters[0]} not implemented.`);
>+
>+        this._add(`if (${args[1]} >= ${args[0]}.length) {`);
>+        this._indent(() => this._emitTrap(true));
>+        this._add(`}`);
>+        this._add(`// Operator indexer`);
>+        this._add(`${result} = &(${args[0]}.ptr[${args[1]}]);`);
>+    }
>+
>+    _emitOperatorAnder(node, result, args)
>+    {
>+        const type = node.implementationData.type;
>+        const field = this._typeAttributes.attributesForType(type).mangledFieldName(node.implementationData.name);
>+        this._add(`${result} = &((${args[0]})->${field});`);
>+    }
>+
>+    _emitOperatorGetter(node, result, args)
>+    {
>+        const type = node.implementationData.type;
>+        const field = this._typeAttributes.attributesForType(type).mangledFieldName(node.implementationData.name);
>+        this._add(`${result} = ${args[0]}.${field};`);
>+    }
>+
>+    _emitOperatorSetter(node, result, args)
>+    {
>+        // FIXME: Currently no WHLSL source produces structs that only have getters/setters rather than the ander,
>+        // and the ander is always preferred over the getter and setter. Therefore this code is untested.
>+        const type = node.implementationData.type;
>+        const field = this._typeAttributes.attributesForType(type).mangledFieldName(node.implementationData.name);
>+        this._add(`${args[0]}.${field} = ${args[1]};`);
>+        this._add(`${result} = ${args[0]}`);
>+    }
>+
>+    visitMakePtrExpression(node)
>+    {
>+        return `&(${node.lValue.visit(this)})`;
>+    }
>+
>+    // 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)
>+    {
>+        this._emitAsLoop(node.condition, node.increment, (conditionVar) => {
>+            Node.visit(node.initialization, this);
>+            this._emitLoopCondition();
>+            this._add(`while (${conditionVar}) {`);
>+            this._indent(() => {
>+                node.body.visit(this);
>+                this._emitLoopBodyEnd();
>+            });
>+            this._add('}');
>+        });
>+    }
>+
>+    visitWhileLoop(node)
>+    {
>+        this._emitAsLoop(node.conditional, null, (conditionVar) => {
>+            this._add(`while (${conditionVar}) {`);
>+            this._indent(() => {
>+                node.body.visit(this);
>+                this._emitLoopCondition();
>+            });
>+            this._add('}');
>+        });
>+    }
>+
>+    visitDoWhileLoop(node)
>+    {
>+        this._emitAsLoop(node.conditional, null, conditionVar => {
>+            this._add("do {");
>+            this._indent(() => {
>+                node.body.visit(this);
>+                this._emitLoopBodyEnd();
>+            });
>+            this._add(`} while (${conditionVar});`);
>+        });
>+    }
>+
>+    _emitAsLoop(conditional, increment, emitLoopBody)
>+    {
>+        const conditionVar = this._fresh();
>+        this._loopConditionVariableStack.push(conditionVar);
>+        this._loopConditionNodeStack.push(conditional);
>+        this._loopIncrementNodeStack.push(increment);
>+        this._add(`bool ${conditionVar} = true;`);
>+
>+        emitLoopBody(conditionVar);
>+
>+        this._loopIncrementNodeStack.pop();
>+        this._loopConditionVariableStack.pop();
>+        this._loopConditionNodeStack.pop();
>+    }
>+
>+    _emitLoopBodyEnd()
>+    {
>+        this._emitLoopIncrement();
>+        this._emitLoopCondition();
>+    }
>+
>+    _emitLoopIncrement()
>+    {
>+        Node.visit(this._loopIncrement, this);
>+    }
>+
>+    _emitLoopCondition()
>+    {
>+        if (this._loopCondition) {
>+            const conditionResult = this._loopCondition.visit(this);
>+            this._add(`${this._loopConditionVariable} = ${conditionResult};`);
>+        }
>+    }
>+
>+    // Switch statements.
>+
>+    visitSwitchStatement(node)
>+    {
>+        const caseValueEmitter = new MSLConstexprEmitter();
>+
>+        let switchValue = Node.visit(node.value, this);
>+        this._add(`switch (${switchValue}) {`);
>+        this._indent(() => {
>+            for (let i = 0; i < node.switchCases.length; i++) {
>+                let switchCase = node.switchCases[i];
>+                if (!switchCase.isDefault)
>+                    this._add(`case ${switchCase.value.visit(caseValueEmitter)}: {`);
>+                else
>+                    this._add("default: {");
>+                this._visitAndIndent(switchCase.body);
>+                this._add("}");
>+            }
>+        });
>+        this._add("}");
>+    }
>+
>+    visitSwitchCase(node)
>+    {
>+        throw new Error(`MSLStatementEmitter.visitSwitchCase called; switch statements should be fully handled by MSLStatementEmitter.visitSwitchStatement.`);
>+    }
>+
>+    // Literals
>+
>+    visitBoolLiteral(node)
>+    {
>+        const fresh = this._fresh();
>+        this._add(`bool ${fresh} = ${node.value};`);
>+        return fresh;
>+    }
>+
>+    visitEnumLiteral(node)
>+    {
>+        return node.member.value.visit(this);
>+    }
>+
>+    visitGenericLiteral(node)
>+    {
>+        const fresh = this._fresh();
>+        this._add(mslVarDeclaration(this._typeNamer, node.type, fresh) + ";");
>+        this._add(`${fresh} = ${node.value};`);
>+        return fresh;
>+    }
>+
>+    visitNullLiteral(node)
>+    {
>+        return `nullptr`;
>+    }
>+
>+    visitDotExpression(node)
>+    {
>+        throw new Error(`MSLStatementEmitter.visitDotExpression called; ${node} should have been converted to an operator function call.`);
>+    }
>+
>+    visitTrapStatement(node)
>+    {
>+        this._emitTrap(true);
>+    }
>+
>+    visitLogicalExpression(node)
>+    {
>+        const result = this._fresh();
>+        this._add(`// Result variable for ${node.text}`);
>+        this._add(`bool ${result};`);
>+        if (node.text == "&&") {
>+            const left = node.left.visit(this);
>+            this._add(`if (!${left}) {`)
>+            this._indent(() => this._add(`${result} = false;`));
>+            this._add('} else {');
>+            this._indent(() => this._add(`${result} = ${node.right.visit(this)};`));
>+            this._add('}');
>+        } else if (node.text == "||") {
>+            const left = node.left.visit(this);
>+            this._add(`${result} = ${left};`);
>+            this._add(`if (!${result}) {`);
>+            this._indent(() => this._add(`${result} = ${node.right.visit(this)};`));
>+            this._add("}");
>+        } else
>+            throw new Error(`Unrecognized logical expression ${node.text}`);
>+        return result;
>+    }
>+
>+    visitTernaryExpression(node)
>+    {
>+        // FIXME: If each of the three expressions isn't a compound expression or statement then just use ternary syntax.
>+        let resultType = typeOf(node.bodyExpression);
>+        if (node.isLValue)
>+            resultType = new PtrType(node.origin, "thread", resultType);
>+        let resultVar = this._fresh();
>+        this._add(mslVarDeclaration(this._typeNamer, resultType, resultVar) + ";");
>+        const predicate = node.predicate.visit(this);
>+        this._add(`if (${predicate}) {`);
>+        this._indent(() => {
>+            const bodyExpression = node.bodyExpression.visit(this);
>+            if (node.isLValue)
>+                this._add(`${resultVar} = &(${bodyExpression});`);
>+            else
>+                this._add(`${resultVar} = ${bodyExpression};`);
>+        });
>+        this._add("} else {");
>+        this._indent(() => {
>+            const elseExpression = node.elseExpression.visit(this);
>+            if (node.isLValue)
>+                this._add(`${resultVar} = &(${elseExpression});`);
>+            else
>+                this._add(`${resultVar} = ${elseExpression};`);
>+        });
>+        this._add("}");
>+
>+        if (node.isLValue)
>+            resultVar = `*(${resultVar})`;
>+
>+        return resultVar;
>+    }
>+
>+    visitIndexExpression(node)
>+    {
>+        throw new Error("MSLStatementEmitter.visitIndexExpression is not implemented; IndexExpression should not appear in the AST for Metal codegen.");
>+    }
>+
>+    visitNativeFunc(node)
>+    {
>+        throw new Error("MSLStatementEmitter.visitNativeFunc is not implemented; NativeFunction is not compiled by the Metal codegen.");
>+    }
>+
>+    visitNativeTypeInstance(node)
>+    {
>+        throw new Error("MSLStatementEmitter.visitNativeTypeInstance is not implemented.");
>+    }
>+
>+    visitReadModifyWriteExpression(node)
>+    {
>+        throw new Error("MSLStatementEmitter.visitReadModifyWriteExpression is not implemented; it should have been transformed out the tree in earlier stage.");
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeAttributes.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeAttributes.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..d6f1676130a8d03fb2f757b9c2b7ed8c41ca1750
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeAttributes.js
>@@ -0,0 +1,86 @@
>+/*
>+ * 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 MSLTypeAttributes {
>+
>+    constructor(type)
>+    {
>+        this._type = type;
>+        this._isVertexAttribute = false;
>+        this._isVertexOutputOrFragmentInput = false;
>+        this._isFragmentOutput = false;
>+        this._fieldMangler = new MSLNameMangler('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/MSLTypeAttributesMap.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeAttributesMap.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..373b0e8c0fe93488988b6f830c7a9c6f703a28f6
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeAttributesMap.js
>@@ -0,0 +1,66 @@
>+/*
>+ * 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 MSLTypeAttributesMap {
>+
>+    constructor(functionDefs, typeUnifier)
>+    {
>+        this._typeUnifier = typeUnifier;
>+        this._typeAttributeMap = new Map();
>+
>+        for (let funcDef of functionDefs) {
>+            if (funcDef.shaderType == "vertex")
>+                this._visitVertexShader(funcDef);
>+            else if (funcDef.shaderType == "fragment")
>+                this._visitFragmentShader(funcDef);
>+        }
>+    }
>+
>+    attributesForType(type)
>+    {
>+        const key = this._typeUnifier.uniqueTypeId(type);
>+        let attrs = this._typeAttributeMap.get(key);
>+        if (!attrs)
>+            this._typeAttributeMap.set(key, attrs = new MSLTypeAttributes(type));
>+        return attrs;
>+    }
>+
>+    _visitVertexShader(func)
>+    {
>+        this.attributesForType(func.returnType).isVertexOutputOrFragmentInput = true;
>+        for (let param of func.parameters)
>+            this.attributesForType(param.type).isVertexAttribute = true;
>+    }
>+
>+    _visitFragmentShader(func)
>+    {
>+        this.attributesForType(func.returnType).isFragmentOutput = true;
>+        for (let param of func.parameters)
>+            this.attributesForType(param.type).isVertexOutputOrFragmentInput = true;
>+    }
>+
>+    // FIXME: Support compute shaders.
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..8c4dd61a37216534917cd21ae97bbd608eb9f10a
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeNamer.js
>@@ -0,0 +1,148 @@
>+/*
>+ * 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 {
>+
>+    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 typeUnifier = this.typeUnifier;
>+        const typeNamer = this;
>+        let emittedAddressSpaceForArray = false;
>+
>+        class TypeNameVisitor extends Visitor {
>+            visitNativeType(node)
>+            {
>+                // FIXME: Also add samplers and textures here.
>+                const nativeTypeNameMap = {
>+                    "void": "void",
>+                    "bool": "bool",
>+                    "uchar": "uint8_t",
>+                    "ushort": "uint16_t",
>+                    "uint": "uint32_t",
>+                    "char": "int8_t",
>+                    "short": "int16_t",
>+                    "int": "int32_t",
>+                    "half": "half",
>+                    "float": "float",
>+                    "atomic_int": "atomic_int",
>+                    "atomic_uint": "atomic_uint"
>+                };
>+
>+                name = nativeTypeNameMap[node.name];
>+            }
>+
>+            visitStructType(node)
>+            {
>+                name = typeUnifier.uniqueTypeId(node);
>+            }
>+
>+            visitEnumType(node) 
>+            { 
>+                return Node.visit(node.baseType, this); 
>+            }
>+
>+            visitReferenceType(node)
>+            {
>+                name = `${node.addressSpace} ${typeNamer.mslTypeName(node.elementType)}*`;
>+            }
>+
>+            visitArrayType(node)
>+            {
>+                name = `${node.addressSpace ? node.addressSpace + " " : ""}${typeNamer.mslTypeName(node.elementType)}*`;
>+            }
>+
>+            visitArrayRefType(node)
>+            {
>+                name = typeUnifier.uniqueTypeId(node);
>+            }
>+
>+            visitVectorType(node)
>+            {
>+                // Vector type names work slightly differently to native type names
>+                const elementTypeNameMap = {
>+                    "bool": "bool",
>+                    "char": "char",
>+                    "uchar": "uchar",
>+                    "short": "short",
>+                    "ushort": "ushort",
>+                    "int": "int",
>+                    "uint": "uint",
>+                    "half": "half",
>+                    "float": "float"
>+                };
>+
>+                const elementTypeName = elementTypeNameMap[node.elementType.name];
>+                if (!elementTypeName)
>+                    throw new Error(`${node.elementType.name} is not a supported vector element type`);
>+
>+                name = `${elementTypeName}${node.numElementsValue}`;
>+            }
>+
>+            visitTypeRef(node)
>+            {
>+                node.type.visit(this);
>+            }
>+
>+            visitMatrixType(node)
>+            {
>+                const elementTypeNameMap = {
>+                    "half": "half",
>+                    "float": "float"
>+                };
>+
>+                const elementTypeName = elementTypeNameMap[node.elementType.name];
>+                if (!elementTypeName)
>+                    throw new Error(`${node.elementType.name} is not a supported matrix element type`);
>+
>+                name = `${elementTypeName}${node.numRowsValue}x${node.numColumnsValue}`;
>+            }
>+        }
>+
>+        type.visit(new TypeNameVisitor());
>+
>+        if (!name)
>+            throw new Error(`${type} doesn't have a name`);
>+
>+        return name;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeUnifier.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeUnifier.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..8b9bbcbb5b0eb837569c88c2fb1ffda8ca7e46bd
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLTypeUnifier.js
>@@ -0,0 +1,132 @@
>+/*
>+ * 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 MSLTypeUnifier extends Visitor {
>+
>+    constructor()
>+    {
>+        super();
>+
>+        this._typeNameMangler = new MSLNameMangler('T');
>+        this._allTypes = new Set();
>+    }
>+
>+    get allTypes()
>+    {
>+        return this._allTypes;
>+    }
>+
>+    uniqueTypeId(type)
>+    {
>+        return type.visit(this);
>+    }
>+
>+    visitTypeRef(node)
>+    {
>+        if ((node.typeArguments && node.typeArguments.length) || !node.name) {
>+            return node.type.visit(this);
>+        }
>+
>+        if (!this._allTypes.has(node.type))
>+            node.type.visit(this);
>+
>+        const baseType = typeOf(node);
>+
>+        if (baseType instanceof NativeType || baseType instanceof VectorType)
>+            return baseType.visit(this);
>+
>+        return this._typeNameMangler.mangle(node.name);
>+    }
>+
>+    visitStructType(node)
>+    {
>+        this._allTypes.add(node);
>+        for (let field of node.fields)
>+            field.visit(this);
>+        return this._typeNameMangler.mangle(node.name);
>+    }
>+
>+    visitEnumType(node)
>+    {
>+        this._allTypes.add(node);
>+        node.baseType.visit(this);
>+        return this._typeNameMangler.mangle(node.name);
>+    }
>+
>+    visitNativeType(node)
>+    {
>+        this._allTypes.add(node);
>+        return node.name;
>+    }
>+
>+    visitPtrType(node)
>+    {
>+        this._allTypes.add(node);
>+        node.elementType.visit(this);
>+        return `${node.elementType.visit(this)}* ${node.addressSpace}`;
>+    }
>+
>+    visitArrayType(node)
>+    {
>+        this._allTypes.add(node);
>+        node.elementType.visit(this);
>+        return `${node.elementType.visit(this)}[${node.numElements}]`;
>+    }
>+
>+    visitArrayRefType(node)
>+    {
>+        this._allTypes.add(node);
>+        // The name mangler is used here because array refs are "user-defined" types in the sense
>+        // that they will need to be defined as structs in the Metal output.
>+        return this._typeNameMangler.mangle(`${node.elementType.visit(this)}[] ${node.addressSpace}`);
>+    }
>+
>+    visitVectorType(node)
>+    {
>+        this._allTypes.add(node);
>+        return node.toString();
>+    }
>+
>+    visitMakeArrayRefExpression(node)
>+    {
>+        super.visitMakeArrayRefExpression(node);
>+        return node.type.visit(this);
>+    }
>+
>+    typesThatNeedDeclaration()
>+    {
>+        const declSet = new Set();
>+        const nameSet = new Set();
>+        for (let type of this._allTypes) {
>+            const name = type.visit(this);
>+            if ((type instanceof StructType || type instanceof ArrayRefType) && !nameSet.has(name)) {
>+                declSet.add(type);
>+                nameSet.add(name);
>+            }
>+        }
>+        return declSet;
>+    }
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/MSLVarDeclaration.js b/Tools/WebGPUShadingLanguageRI/Metal/MSLVarDeclaration.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..355638c87ede6f1baacf8616ab8bf0f0bec76340
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/MSLVarDeclaration.js
>@@ -0,0 +1,46 @@
>+/*
>+ * 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 mslVarDeclaration(typeNamer, type, name, treatArrayAsPointer = false)
>+{
>+    type = typeOf(type); // Unwrap TypeRef if necessary
>+    if (type.isArray) {
>+        let arrayType = type;
>+        const sizes = [ arrayType.numElementsValue ];
>+        let elementType = typeOf(arrayType.elementType);
>+        while (elementType.isArray) {
>+            arrayType = elementType;
>+            sizes.push(arrayType.numElementsValue);
>+            elementType = arrayType.elementType;
>+        }
>+        if (treatArrayAsPointer)
>+            return `${arrayType.addressSpace ? arrayType.addressSpace : "thread"} ${typeNamer.mslTypeName(elementType)} (*${name})${sizes.slice(1).map(size => `[${size}]`).join('')}`;
>+        else
>+            return `${typeNamer.mslTypeName(elementType)} ${name}${sizes.map(size => `[${size}]`).join('')}`;
>+    } else if (type.isPtr)
>+        return (type).addressSpace + " " + mslVarDeclaration(typeNamer, (type).elementType, `(*${name})`);
>+    else
>+        return `${typeNamer.mslTypeName(type)} ${name}`;
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/TypeOf.js b/Tools/WebGPUShadingLanguageRI/Metal/TypeOf.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..a1be79332a9c28843228fac3c770d905889b4771
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/TypeOf.js
>@@ -0,0 +1,325 @@
>+/*
>+ * 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.
>+ */
>+
>+// FIXME: Rather than being a separate function this should instead be a separate preparation phase that annotates
>+// each Node instance with a "type" property. https://bugs.webkit.org/show_bug.cgi?id=189611
>+function typeOf(node) {
>+    class TypeVisitor extends Visitor {
>+        visitAnonymousVariable(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitArrayRefType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitArrayType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitAssignment(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitCallExpression(node)
>+        {
>+            return node.func.visit(this);
>+        }
>+
>+        visitCommaExpression(node)
>+        {
>+            return node.list[node.list.length - 1].visit(this);
>+        }
>+
>+        visitConvertPtrToArrayRefExpression(node)
>+        {
>+            const ptrType = typeOf(node.lValue);
>+            return new ArrayRefType(node.origin, ptrType.addressSpace, ptrType.elementType);
>+        }
>+
>+        visitDotExpression(node)
>+        {
>+            return node.struct.fieldMap.get(node.fieldName).type.visit(this);
>+        }
>+
>+        visitElementalType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitEnumType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitField(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitFunc(node)
>+        {
>+            return node.returnType.visit(this);
>+        }
>+
>+        visitFuncDef(node)
>+        {
>+            return node.returnType.visit(this);
>+        }
>+
>+        visitFuncParameter(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitFunctionLikeBlock(node)
>+        {
>+            return node.returnType.visit(this);
>+        }
>+
>+        visitGenericLiteralType(node)
>+        {
>+            return typeOf(node.type);
>+        }
>+
>+        visitIdentityExpression(node)
>+        {
>+            return node.target.visit(this);
>+        }
>+
>+        visitIndexExpression(node)
>+        {
>+            return node.array.elementType.visit(this);
>+        }
>+
>+        visitLogicalExpression(node)
>+        {
>+            throw new Error("FIXME: Implement TypeVisitor.visitLogicalExpression");
>+        }
>+
>+        visitLogicalNot(node)
>+        {
>+            return node.operand.visit(this);
>+        }
>+
>+        visitMakeArrayRefExpression(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitMakePtrExpression(node)
>+        {
>+            throw new Error("FIXME: Implement TypeVisitor.visitMakePtrExpression");
>+        }
>+
>+        visitMatrixType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitNativeFunc(node)
>+        {
>+            return node.returnType.visit(this);
>+        }
>+
>+        visitNativeFuncInstance(node)
>+        {
>+            return node.returnType.visit(this);
>+        }
>+
>+        visitNativeType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitNativeTypeInstance(node)
>+        {
>+            return node;
>+        }
>+
>+        visitNullLiteral(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitNullType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitPtrType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitReadModifyWriteExpression(node)
>+        {
>+            throw new Error("FIXME: Implement TypeVisitor.visitReadModifyWriteExpression");
>+        }
>+
>+        visitReferenceType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitStructType(node)
>+        {
>+            return node;
>+        }
>+
>+        visitTypeDef(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitTypeRef(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitVariableDecl(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        visitVariableRef(node)
>+        {
>+            return node.variable.type.visit(this);
>+        }
>+
>+        visitVectorType(node)
>+        {
>+            return node;
>+        }
>+
>+        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");
>+        }
>+
>+        visitDereferenceExpression(node)
>+        {
>+            return node.type.visit(this);
>+        }
>+
>+        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)
>+        {
>+            return node.type.visit(this);
>+        }
>+        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(new TypeVisitor());
>+}
>\ 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"?>
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>+    <dependencies>
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>+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
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>+        
>+        <scene sceneID="JPo-4y-FX3">
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>+                    <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">
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>+                                            <connections>
>+                                                <action selector="unhideAllApplications:" target="Ady-hI-5gd" id="Dhg-Le-xox"/>
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>+                                        </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"/>
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>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
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>+                                <menu key="submenu" title="File" id="bib-Uj-vzu">
>+                                    <items>
>+                                        <menuItem title="New" keyEquivalent="n" id="Was-JA-tGl">
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>+                                        </menuItem>
>+                                        <menuItem title="Open Default" keyEquivalent="D" id="aei-2z-FdS">
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>+                                            <connections>
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>+                                            <menu key="submenu" title="Find" id="1b7-l0-nxx">
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>+                                                <items>
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>+                                                <items>
>+                                                    <menuItem title="Show Substitutions" id="z6F-FW-3nz">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
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>+                                                    <menuItem title="Smart Copy/Paste" id="9yt-4B-nSM">
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>+                                                    <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"/>
>+                                                                </menuItem>
>+                                                                <menuItem id="YGs-j5-SAR">
>+                                                                    <string key="title">	Default</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeBaseWritingDirectionNatural:" target="Ady-hI-5gd" id="qtV-5e-UBP"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem id="Lbh-J2-qVU">
>+                                                                    <string key="title">	Left to Right</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeBaseWritingDirectionLeftToRight:" target="Ady-hI-5gd" id="S0X-9S-QSf"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem id="jFq-tB-4Kx">
>+                                                                    <string key="title">	Right to Left</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeBaseWritingDirectionRightToLeft:" target="Ady-hI-5gd" id="5fk-qB-AqJ"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem isSeparatorItem="YES" id="swp-gr-a21"/>
>+                                                                <menuItem title="Selection" enabled="NO" id="cqv-fj-IhA">
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                </menuItem>
>+                                                                <menuItem id="Nop-cj-93Q">
>+                                                                    <string key="title">	Default</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeTextWritingDirectionNatural:" target="Ady-hI-5gd" id="lPI-Se-ZHp"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem id="BgM-ve-c93">
>+                                                                    <string key="title">	Left to Right</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeTextWritingDirectionLeftToRight:" target="Ady-hI-5gd" id="caW-Bv-w94"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                                <menuItem id="RB4-Sm-HuC">
>+                                                                    <string key="title">	Right to Left</string>
>+                                                                    <modifierMask key="keyEquivalentModifierMask"/>
>+                                                                    <connections>
>+                                                                        <action selector="makeTextWritingDirectionRightToLeft:" target="Ady-hI-5gd" id="EXD-6r-ZUu"/>
>+                                                                    </connections>
>+                                                                </menuItem>
>+                                                            </items>
>+                                                        </menu>
>+                                                    </menuItem>
>+                                                    <menuItem isSeparatorItem="YES" id="fKy-g9-1gm"/>
>+                                                    <menuItem title="Show Ruler" id="vLm-3I-IUL">
>+                                                        <modifierMask key="keyEquivalentModifierMask"/>
>+                                                        <connections>
>+                                                            <action selector="toggleRuler:" target="Ady-hI-5gd" id="FOx-HJ-KwY"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Copy Ruler" keyEquivalent="c" id="MkV-Pr-PK5">
>+                                                        <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
>+                                                        <connections>
>+                                                            <action selector="copyRuler:" target="Ady-hI-5gd" id="71i-fW-3W2"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                    <menuItem title="Paste Ruler" keyEquivalent="v" id="LVM-kO-fVI">
>+                                                        <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
>+                                                        <connections>
>+                                                            <action selector="pasteRuler:" target="Ady-hI-5gd" id="cSh-wd-qM2"/>
>+                                                        </connections>
>+                                                    </menuItem>
>+                                                </items>
>+                                            </menu>
>+                                        </menuItem>
>+                                    </items>
>+                                </menu>
>+                            </menuItem>
>+                            <menuItem title="View" id="H8h-7b-M4v">
>+                                <modifierMask key="keyEquivalentModifierMask"/>
>+                                <menu key="submenu" title="View" id="HyV-fh-RgO">
>+                                    <items>
>+                                        <menuItem title="Show Toolbar" keyEquivalent="t" id="snW-S8-Cw5">
>+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
>+                                            <connections>
>+                                                <action selector="toggleToolbarShown:" target="Ady-hI-5gd" id="BXY-wc-z0C"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Customize Toolbarâ¦" id="1UK-8n-QPP">
>+                                            <modifierMask key="keyEquivalentModifierMask"/>
>+                                            <connections>
>+                                                <action selector="runToolbarCustomizationPalette:" target="Ady-hI-5gd" id="pQI-g3-MTW"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem isSeparatorItem="YES" id="hB3-LF-h0Y"/>
>+                                        <menuItem title="Reset viewport" keyEquivalent="R" id="0RE-Am-xSc">
>+                                            <connections>
>+                                                <action selector="resetViewport:" target="Ady-hI-5gd" id="PdF-ub-35F"/>
>+                                            </connections>
>+                                        </menuItem>
>+                                        <menuItem title="Show Sidebar" keyEquivalent="s" id="kIP-vf-haE">
>+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
>+                                            <connections>
>+                                                <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"/>
>+                                            <connections>
>+                                                <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">
>+                                    <items>
>+                                        <menuItem title="Minimize" keyEquivalent="m" id="OY7-WF-poV">
>+                                            <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"/>
>+                <customObject id="Ady-hI-5gd" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
>+            </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>
>+                    <connections>
>+                        <outlet property="debugLabel" destination="aSY-2r-vMu" id="hSC-9N-nj9"/>
>+                        <outlet property="metalView" destination="9FG-iv-6pr" id="d1K-E7-8zL"/>
>+                        <outlet property="mslTextView" destination="82n-yv-OVo" id="eoE-3h-vhV"/>
>+                        <outlet property="mslViewContainer" destination="tuu-uc-Dxg" id="Z3D-cP-qY2"/>
>+                        <outlet property="whlslTextView" destination="pRP-9d-8nB" id="Muf-bo-NKk"/>
>+                        <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"/>
>+        </scene>
>+    </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..871e9c5df58a1e70b05cdebcd88fb366b0c26055
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.h	
>@@ -0,0 +1,23 @@
>+//
>+//  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;
>+// FIXME: This should be NSDictionary<NSString*, NSArray<NSString*>*>*
>+@property (readonly) NSDictionary<NSString*, NSString*>* functionNameMap;
>+
>+@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..e207bb437cc05044be3bc2ef6e5ae0dc0bb8dbff
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/CompileResult.m	
>@@ -0,0 +1,29 @@
>+//
>+//  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*, NSString*>* functionNameMap;
>+
>+@end
>+
>+@implementation CompileResult
>+
>+- (instancetype)initWithMetalSource:(NSString *)source functionNameMap:(NSDictionary<NSString *, NSString *> *)map
>+{
>+    if (self = [super init]) {
>+        self.source = source;
>+        self.functionNameMap = map;
>+    }
>+    return self;
>+}
>+
>+@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..0ef3ac2ae260e688df466433d30153ef99a0f744
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.h	
>@@ -0,0 +1,22 @@
>+//
>+//  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;
>+
>+@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..995329c742948ab219a4eaad184ca4c7c4cf3d2c
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Compiler.m	
>@@ -0,0 +1,86 @@
>+//
>+//  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(@"MSLCodegenAll.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:@"WhlslCompiler" 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;
>+}
>+
>+@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..2419df7a0bb9ef7b8477ef029dfe89459417eb73
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Demo shaders/Default.whlsl	
>@@ -0,0 +1,26 @@
>+struct VertexInput {
>+    float2 position;
>+    float2 uv;
>+}
>+
>+struct VertexOutput {
>+    float4 wsl_Position;
>+    float4 color;
>+}
>+
>+struct FragmentOutput {
>+    float4 wsl_Color;
>+}
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput) {
>+    VertexOutput result;
>+    result.wsl_Position = float4(vertexInput.position, 0., 1.);
>+    result.color = float4(vertexInput.uv, 0.0, 1.0);
>+    return result;
>+}
>+
>+fragment FragmentOutput fragmentShader(VertexOutput stageIn) {
>+    FragmentOutput result;
>+    result.wsl_Color = stageIn.color;
>+    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..95f7c4f7f982de11c763305b89f268a7b3e37c6b
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/OffscreenRenderer.m	
>@@ -0,0 +1,87 @@
>+//
>+//  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;
>+    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..14a3b02078725ffdc4a736f057c9c59353b5c11e
>--- /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 device:(id<MTLDevice>)device;
>+
>+@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..f01b44f8e2c9624de15630aa41971b722c5085ca
>--- /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 device:(nonnull id<MTLDevice>)device
>+{
>+    self = [super initWithDevice:device];
>+    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 (!library && 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..e3ccfb7205c5909aa14835132d0c2e8d99d8b62d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/Renderer/Renderer.h	
>@@ -0,0 +1,37 @@
>+//
>+//  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
>+
>+- (instancetype)initWithDevice:(id<MTLDevice>)device;
>+
>+@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..64b45bdca57962a3fdb5ab4cc4beabcc018497da
>--- /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)initWithDevice:(id<MTLDevice>)device
>+{
>+    self = [super init];
>+    if (self) {
>+        _device = device;
>+        _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(0, 0, 0, 0);
>+    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..4d8b0346a2b8d3602628f489a67ea63b4878646f
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.h	
>@@ -0,0 +1,37 @@
>+//
>+//  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 {
>+    WHLSLTypeBool,
>+    WHLSLTypeUchar,
>+    WHLSLTypeShort,
>+    WHLSLTypeInt,
>+    WHLSLTypeUshort,
>+    WHLSLTypeUint,
>+    WHLSLTypeHalf,
>+    WHLSLTypeFloat
>+} WHLSLType;
>+
>+NSString* WHLSLTypeString(WHLSLType type);
>+
>+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..cb8a8275f8a90f2c30c4f270c6e1a6917393eefe
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestCallArgument.m	
>@@ -0,0 +1,76 @@
>+//
>+//  TestCallArgument.m
>+//  WHLSL Tests
>+//
>+//  Created by Thomas Denney on 8/3/18.
>+//  Copyright Â© 2018 Apple, Inc. All rights reserved.
>+//
>+
>+#import "TestCallArgument.h"
>+
>+NSString* WHLSLTypeString(WHLSLType type)
>+{
>+    switch (type) {
>+    case WHLSLTypeBool:
>+        return @"bool";
>+    case WHLSLTypeUchar:
>+        return @"uchar";
>+    case WHLSLTypeShort:
>+        return @"ushort";
>+    case WHLSLTypeInt:
>+        return @"int";
>+    case WHLSLTypeUshort:
>+        return @"ushort";
>+    case WHLSLTypeUint:
>+        return @"uint";
>+    case WHLSLTypeHalf:
>+        return @"half";
>+    case WHLSLTypeFloat:
>+        return @"float";
>+    default:
>+        return nil;
>+    }
>+}
>+
>+@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;
>+}
>+
>+// FIXME: This should probably be MSL source
>+- (NSString*)whlslSource
>+{
>+    switch (self.type) {
>+    case WHLSLTypeBool:
>+        return self.value.boolValue ? @"true" : @"false";
>+    case WHLSLTypeUchar:
>+        return [NSString stringWithFormat:@"uint8_t(%uu)", self.value.unsignedIntValue];
>+    case WHLSLTypeShort:
>+        return [NSString stringWithFormat:@"int16_t(%d)", self.value.intValue];
>+    case WHLSLTypeUshort:
>+        return [NSString stringWithFormat:@"uint16_t(%uu)", self.value.unsignedIntValue];
>+    case WHLSLTypeInt:
>+        return [NSString stringWithFormat:@"%d", self.value.intValue];
>+    case WHLSLTypeUint:
>+        return [NSString stringWithFormat:@"%uu", self.value.unsignedIntValue];
>+    case WHLSLTypeHalf:
>+        return [NSString stringWithFormat:@"%f", self.value.floatValue];
>+    case WHLSLTypeFloat:
>+        return [NSString stringWithFormat:@"half(%f)", self.value.floatValue];
>+    }
>+}
>+
>+@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..2968e7d0bacdfc17f134acb8f7e4bae9d37a825d
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.h	
>@@ -0,0 +1,33 @@
>+//
>+//  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*)metalFragmentShaderSourceForCallToMetalFunction:(NSString*)compiledNameOfFunction;
>+
>+@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..21f20d38131301273a9065f2312e7d63a128f952
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestDescription.m	
>@@ -0,0 +1,105 @@
>+//
>+//  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:(NSString*)compiledNameOfFunction
>+{
>+    NSMutableString* string = [NSMutableString new];
>+    [string appendFormat:@"%@(", compiledNameOfFunction];
>+    
>+    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*)description
>+{
>+    NSMutableString* string = [NSMutableString new];
>+    [string appendFormat:@"%@ %@(", WHLSLTypeString(self.returnType), self.functionName];
>+    BOOL first = YES;
>+    for (TestCallArgument* argument in self.arguments) {
>+        if (!first)
>+            [string appendFormat:@", %@ %@", WHLSLTypeString(self.returnType), argument.whlslSource];
>+        else
>+            [string appendFormat:@"%@ %@", WHLSLTypeString(self.returnType), argument.whlslSource];
>+        first = NO;
>+    }
>+    [string appendString:@")"];
>+    return string;
>+}
>+
>+- (NSString*)metalFragmentShaderSourceForCallToMetalFunction:(NSString *)compiledNameOfFunction
>+{
>+    NSString* returnTypeString;
>+    switch (self.returnType) {
>+    case WHLSLTypeBool:
>+    case WHLSLTypeUchar:
>+    case WHLSLTypeUshort:
>+    case WHLSLTypeUint:
>+        returnTypeString = @"FragmentOutputUint";
>+        break;
>+    case WHLSLTypeShort:
>+    case WHLSLTypeInt:
>+        returnTypeString = @"FragmentOutputInt";
>+        break;
>+    case WHLSLTypeHalf:
>+    case WHLSLTypeFloat:
>+        returnTypeString = @"FragmentOutputFloat";
>+        break;
>+    }
>+    NSMutableString* string = [NSMutableString new];
>+    [string appendFormat:@"fragment %@ %@(VertexOutput stageIn [[stage_in]])\n", returnTypeString, self.fragmentShaderName];
>+    [string appendString:@"{\n"];
>+    [string appendFormat:@"    %@ fragmentOutput;\n", returnTypeString];
>+    
>+    NSString * call = [self callString:compiledNameOfFunction];
>+    
>+    switch (self.returnType) {
>+        case WHLSLTypeBool:
>+        case WHLSLTypeUchar:
>+        case WHLSLTypeUshort:
>+        case WHLSLTypeUint:
>+            [string appendFormat:@"    fragmentOutput.result = uint32_t(%@);\n", call];
>+            break;
>+        case WHLSLTypeShort:
>+        case WHLSLTypeInt:
>+            [string appendFormat:@"    fragmentOutput.result = int32_t(%@);\n", call];
>+            break;
>+        case WHLSLTypeHalf:
>+        case WHLSLTypeFloat:
>+            [string appendFormat:@"    fragmentOutput.result = float(%@);\n", call];
>+            break;
>+    }
>+    
>+    [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..98e88d77d014fb3a1e692f2d80b810b13e4b4e1e
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.h	
>@@ -0,0 +1,37 @@
>+//
>+//  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* whlslSource;
>+@property (readonly) NSUInteger totalTestCaseCount;
>+
>+- (void)addTestDescription:(TestDescription*)testDescription;
>+- (NSArray<TestDescription*>*)testsForReturnType:(WHLSLType)type;
>+
>++ (NSString*)sharedMetalSource;
>+- (NSString*)metalSourceForCallingFunctionsWithCompiledNames:(NSDictionary<NSString*,NSString*>*)compiledNames;
>+
>++ (NSArray<TestFamily*>*)allTests;
>+
>+- (NSArray<TestDescription*>*)integerTests;
>+- (NSArray<TestDescription*>*)unsignedIntegerTests;
>+- (NSArray<TestDescription*>*)floatTests;
>+
>+@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..dd2e4d56fa375d972a6446da3cb55b9845d94055
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamily.m	
>@@ -0,0 +1,222 @@
>+//
>+//  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* whlslSource;
>+@property NSUInteger totalTestCaseCount;
>+
>+@property NSMutableDictionary<NSNumber*, NSMutableArray<TestDescription*>*>* tests;
>+
>+@end
>+
>+@implementation TestFamily
>+
>+- (instancetype)initWithName:(NSString *)name source:(NSString *)source
>+{
>+    if (self = [super init]) {
>+        self.name = name;
>+        self.whlslSource = source;
>+        self.tests = [NSMutableDictionary new];
>+        self.tests[@(WHLSLTypeBool)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeUchar)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeShort)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeUshort)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeUint)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeInt)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeFloat)] = [NSMutableArray new];
>+        self.tests[@(WHLSLTypeHalf)] = [NSMutableArray new];
>+    }
>+    return self;
>+}
>+
>+- (void)addTestDescription:(TestDescription *)testDescription
>+{
>+    [self.tests[@(testDescription.returnType)] addObject:testDescription];
>+    testDescription.testFamily = self;
>+    testDescription.fragmentShaderName = [NSString stringWithFormat:@"fragment_%@_%ld", self.name, self.totalTestCaseCount++];
>+}
>+
>+- (NSArray<TestDescription*>*)testsForReturnType:(WHLSLType)type
>+{
>+    return self.tests[@(type)];
>+}
>+
>+- (NSArray<TestDescription*>*)integerTests
>+{
>+    NSMutableArray<TestDescription*>* result = [NSMutableArray new];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeShort]];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeInt]];
>+    return result;
>+}
>+
>+- (NSArray<TestDescription*>*)unsignedIntegerTests
>+{
>+    NSMutableArray<TestDescription*>* result = [NSMutableArray new];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeBool]];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeUchar]];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeUshort]];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeUint]];
>+    return result;
>+}
>+
>+- (NSArray<TestDescription*>*)floatTests
>+{
>+    NSMutableArray<TestDescription*>* result = [NSMutableArray new];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeHalf]];
>+    [result addObjectsFromArray:[self testsForReturnType:WHLSLTypeFloat]];
>+    return result;
>+}
>+
>++ (NSString*)sharedMetalSource
>+{
>+    static NSString* result;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        NSString* path = [[NSBundle mainBundle] pathForResource:@"_SharedMetal" ofType:@"txt"];
>+        result = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
>+    });
>+    return result;
>+}
>+
>+- (NSString*)metalSourceForCallingFunctionsWithCompiledNames:(NSDictionary<NSString *,NSString *> *)compiledNames
>+{
>+    NSMutableString* source = [NSMutableString new];
>+
>+    [self.tests enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull type, NSMutableArray<TestDescription *> * _Nonnull tests, BOOL * _Nonnull stop) {
>+        for (TestDescription* testDescription in tests) {
>+            [source appendFormat:@"%@\n", [testDescription metalFragmentShaderSourceForCallToMetalFunction:compiledNames[testDescription.functionName]]];
>+        }
>+    }];
>+
>+    return source;
>+}
>+
>++ (NSArray<TestFamily*>*)allTests
>+{
>+    JSContext* compilerContext = [JSContext new];
>+    // The test suite doesn't actually need to load any of its dependencies in order to generate the data needed for test execution.
>+    compilerContext[@"load"] = ^void(NSString* filePath) {};
>+    // Some of the tests directly call prepare; but these tests can be ignored because they are testing aspects of the interpreter.
>+    compilerContext[@"prepare"] = ^id(NSString* filePath, NSNumber* lineNumber, NSString* src, NSNumber* enableInlining) {
>+        return nil;
>+    };
>+
>+    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;
>+    };
>+    // FIXME: In line with Test.js, these should raise some kind of error if the value cannot be cast safely.
>+    // However, the conversion to an NSNumber may have already lost the precision.
>+
>+    compilerContext[@"makeInt"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeInt];
>+    };
>+
>+    compilerContext[@"makeUint"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeUint];
>+    };
>+
>+    compilerContext[@"makeUchar"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeUchar];
>+    };
>+
>+    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];
>+    };
>+
>+    // FIXME: This should have the same logic as the implementation in Tests.js
>+    compilerContext[@"makeCastedFloat"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeFloat];
>+    };
>+
>+    compilerContext[@"makeHalf"] = ^TestCallArgument*(TestFamily* program, NSNumber* number) {
>+        return [[TestCallArgument alloc] initWithValue:number type:WHLSLTypeHalf];
>+    };
>+
>+    compilerContext[@"callFunction"] = ^TestDescription*(TestFamily* program, NSString* functionName, 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, WHLSLTypeInt);
>+    };
>+
>+    compilerContext[@"checkUint"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeUint);
>+    };
>+
>+    compilerContext[@"checkHalf"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeHalf);
>+    };
>+
>+    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[@"checkUchar"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {
>+        addTest(program, testDesc, expectation, WHLSLTypeUchar);
>+    };
>+
>+    // Deliberately not included
>+    compilerContext[@"checkEnum"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {};
>+    compilerContext[@"checkFloat4"] = ^void(TestFamily* program, TestDescription* testDesc, NSNumber* expectation) {};
>+    compilerContext[@"checkFail"] = ^void(id callback, id errorCallback) {};
>+    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..527bf761acf9ff2a1a11c75502882b28908197c4
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/TestFamilyRunner.m	
>@@ -0,0 +1,175 @@
>+//
>+//  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;
>+}
>+
>++ (id<MTLDevice>)defaultTestingDevice
>+{
>+    NSArray<id<MTLDevice>>* allDevices = MTLCopyAllDevices();
>+    for (id<MTLDevice> device in allDevices) {
>+        if (device.isLowPower)
>+            return device;
>+    }
>+    return MTLCreateSystemDefaultDevice();
>+}
>+
>++ (OffscreenRenderer*)intOffscreenRenderer
>+{
>+    static OffscreenRenderer* offscreenRenderer;
>+    static dispatch_once_t onceToken;
>+    dispatch_once(&onceToken, ^{
>+        offscreenRenderer = [[OffscreenRenderer alloc] initWithDevice:[TestFamilyRunner defaultTestingDevice]];
>+        [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] initWithDevice:[TestFamilyRunner defaultTestingDevice]];
>+        [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] initWithDevice:[TestFamilyRunner defaultTestingDevice]];
>+        [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
>+{
>+    if (!self.testFamily.totalTestCaseCount)
>+        return YES;
>+    
>+    NSString* whlslSource = self.testFamily.whlslSource;
>+    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");
>+
>+    NSMutableString* mslString = [NSMutableString new];
>+    [mslString appendString:result.source];
>+    [mslString appendString:@"\n"];
>+    [mslString appendString:[TestFamily sharedMetalSource]];
>+    [mslString appendString:[self.testFamily metalSourceForCallingFunctionsWithCompiledNames:result.functionNameMap]];
>+
>+    id<MTLDevice> device = MTLCreateSystemDefaultDevice();
>+    NSError *error = nil;
>+    id<MTLLibrary> library = [device newLibraryWithSource:mslString options:nil error:&error];
>+    if (!library) {
>+        NSLog(@"[Library]: %@", error.localizedDescription);
>+        return NO;
>+    }
>+
>+    if (error)
>+        NSLog(@"[Library compiled with warnings]: %@", error.localizedDescription);
>+    NSLog(@"Compiled metal");
>+
>+    BOOL status = YES;
>+
>+    NSString *vertexShaderName = @"vertexShader";
>+
>+    OffscreenRenderer *intRenderer = [TestFamilyRunner intOffscreenRenderer];
>+    for (TestDescription* test in self.testFamily.integerTests) {
>+        [intRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:test.fragmentShaderName];
>+        [intRenderer draw];
>+
>+        int result = intRenderer.intValue;
>+        if (result != test.expectation.intValue) {
>+            NSLog(@"%@ = %d, should be %d", test, result, test.expectation.intValue);
>+            status = NO;
>+        } else
>+            NSLog(@"%@ = %d", test, result);
>+        executionCount++;
>+    }
>+
>+    OffscreenRenderer *uintRenderer = [TestFamilyRunner uintOffscreenRenderer];
>+    for (TestDescription* test in self.testFamily.unsignedIntegerTests) {
>+        [uintRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:test.fragmentShaderName];
>+        [uintRenderer draw];
>+
>+        unsigned int result = uintRenderer.uintValue;
>+        if (result != test.expectation.unsignedIntValue) {
>+            NSLog(@"%@ = %u, should be %u", test, result, test.expectation.unsignedIntValue);
>+            status = NO;
>+        } else
>+            NSLog(@"%@ = %u", test, result);
>+        executionCount++;
>+    }
>+
>+    OffscreenRenderer *floatRenderer = [TestFamilyRunner floatOffscreenRenderer];
>+    for (TestDescription* test in self.testFamily.floatTests) {
>+        [floatRenderer setLibrary:library vertexShaderName:vertexShaderName fragmentShaderName:test.fragmentShaderName];
>+        [floatRenderer draw];
>+
>+        float result = floatRenderer.floatValue;
>+        if (result != test.expectation.floatValue) {
>+            NSLog(@"%@ = %f, should be %f", test, result, test.expectation.floatValue);
>+            status = NO;
>+        } else
>+            NSLog(@"%@ = %f", test, result);
>+        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..3bbf229155c82229ca0d93a508e70845eb52d7f6
>--- /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>
>+
>+@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..12b85648eb61e98cb6c4abdaa194a644d9146024
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/ViewController.m	
>@@ -0,0 +1,209 @@
>+//
>+//  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 device:self.metalView.device];
>+    
>+    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.library = [self.renderer.device newDefaultLibraryWithBundle:[NSBundle mainBundle] error:nil];
>+}
>+
>+- (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;
>+}
>+
>+- (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.functionNameMap[@"vertexShader"];
>+        NSString *fragmentShaderName = output.functionNameMap[@"fragmentShader"];
>+        [self viewDidLayout];
>+        [self.renderer setShaderSource:output.source vertexShaderName:vertexShaderName fragmentShaderName:fragmentShaderName];
>+        [self.metalView setNeedsDisplay:YES];   
>+    }
>+    self.mslTextView.font = [NSFont fontWithName:@"Menlo" size:12];
>+}
>+
>+- (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];
>+}
>+
>+- (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);
>+}
>+
>+@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/_SharedMetal.txt b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_SharedMetal.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..bd64e41de42ef5911a4ddc21797a54d6af07d3ed
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/Core/_SharedMetal.txt	
>@@ -0,0 +1,12 @@
>+struct VertexInput { float2 position [[attribute(0)]]; float2 uv [[attribute(1)]]; };
>+struct VertexOutput { float4 position [[position]]; };
>+struct FragmentOutputFloat { float result; };
>+struct FragmentOutputInt { int result; };
>+struct FragmentOutputUint { uint result; };
>+
>+vertex VertexOutput vertexShader(VertexInput vertexInput [[stage_in]])
>+{
>+    VertexOutput result;
>+    result.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..1cf1fa9b5553824d1627528f3d4e6e4ce43a7caa
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL Tests.xcodeproj/project.pbxproj	
>@@ -0,0 +1,1310 @@
>+// !$*UTF8*$!
>+{
>+	archiveVersion = 1;
>+	classes = {
>+	};
>+	objectVersion = 50;
>+	objects = {
>+
>+/* Begin PBXBuildFile section */
>+		E906B04621139B7700AD1C5E /* Julia.whlsl in Resources */ = {isa = PBXBuildFile; fileRef = E906B04521139B7700AD1C5E /* Julia.whlsl */; };
>+		E921D6362138C02600775099 /* OperatorAnderIndexer.js in Resources */ = {isa = PBXBuildFile; fileRef = E921D6322138C02600775099 /* OperatorAnderIndexer.js */; };
>+		E921D6372138C02600775099 /* MatrixType.js in Resources */ = {isa = PBXBuildFile; fileRef = E921D6332138C02600775099 /* MatrixType.js */; };
>+		E921D6382138C02600775099 /* BuiltinMatrixGetter.js in Resources */ = {isa = PBXBuildFile; fileRef = E921D6342138C02600775099 /* BuiltinMatrixGetter.js */; };
>+		E921D6392138C02600775099 /* BuiltinMatrixSetter.js in Resources */ = {isa = PBXBuildFile; fileRef = E921D6352138C02600775099 /* BuiltinMatrixSetter.js */; };
>+		E92D108A20F56F0600D776B2 /* Compiler.m in Sources */ = {isa = PBXBuildFile; fileRef = E92D108920F56F0600D776B2 /* Compiler.m */; };
>+		E92D108D20F56F4500D776B2 /* MetalKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = E92D108C20F56F4500D776B2 /* MetalKit.framework */; };
>+		E92D108F20F56F4F00D776B2 /* Metal.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = E92D108E20F56F4F00D776B2 /* Metal.framework */; };
>+		E92D109120F56F5700D776B2 /* JavaScriptCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = E92D109020F56F5700D776B2 /* JavaScriptCore.framework */; };
>+		E92D109320F5734900D776B2 /* Default.whlsl in Resources */ = {isa = PBXBuildFile; fileRef = E92D109220F5734900D776B2 /* Default.whlsl */; };
>+		E92D10AF20F57C9F00D776B2 /* OnscreenRenderer.m in Sources */ = {isa = PBXBuildFile; fileRef = E92D10AE20F57C9F00D776B2 /* OnscreenRenderer.m */; };
>+		E92D111520F6FFB600D776B2 /* Renderer.m in Sources */ = {isa = PBXBuildFile; fileRef = E92D111420F6FFB600D776B2 /* Renderer.m */; };
>+		E92D111620F7060E00D776B2 /* AddressSpace.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569BA20F56CD600F5CF34 /* AddressSpace.js */; };
>+		E92D111720F7060E00D776B2 /* All.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569BC20F56CD700F5CF34 /* All.js */; };
>+		E92D111820F7060E00D776B2 /* AnonymousVariable.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569BD20F56CD700F5CF34 /* AnonymousVariable.js */; };
>+		E92D111920F7060E00D776B2 /* ArrayRefType.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569B520F56CD600F5CF34 /* ArrayRefType.js */; };
>+		E92D111A20F7060E00D776B2 /* ArrayType.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569B420F56CD600F5CF34 /* ArrayType.js */; };
>+		E92D111B20F7060E00D776B2 /* Assignment.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569B920F56CD600F5CF34 /* Assignment.js */; };
>+		E92D111C20F7060E00D776B2 /* AutoWrapper.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569BE20F56CD700F5CF34 /* AutoWrapper.js */; };
>+		E92D111D20F7060E00D776B2 /* Block.js in Resources */ = {isa = PBXBuildFile; fileRef = E94C06FC20F56CA300672992 /* Block.js */; };
>+		E92D111E20F7060E00D776B2 /* BoolLiteral.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569B120F56CD600F5CF34 /* BoolLiteral.js */; };
>+		E92D111F20F7060E00D776B2 /* Break.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569B020F56CD600F5CF34 /* Break.js */; };
>+		E92D112020F7060E00D776B2 /* CallExpression.js in Resources */ = {isa = PBXBuildFile; fileRef = E95569BF20F56CD700F5CF34 /* CallExpression.js */; };
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>+				GCC_WARN_UNUSED_FUNCTION = YES;
>+				GCC_WARN_UNUSED_VARIABLE = YES;
>+				MACOSX_DEPLOYMENT_TARGET = 10.14;
>+				MTL_ENABLE_DEBUG_INFO = NO;
>+				SDKROOT = macosx;
>+			};
>+			name = Release;
>+		};
>+		E94C06EB20F56A4200672992 /* Debug */ = {
>+			isa = XCBuildConfiguration;
>+			buildSettings = {
>+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
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>+				CODE_SIGN_STYLE = Automatic;
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>+				DEVELOPMENT_TEAM = "";
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>+					"@executable_path/../Frameworks",
>+				);
>+				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.WHLSL-Toy";
>+				PRODUCT_NAME = "$(TARGET_NAME)";
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>+			name = Debug;
>+		};
>+		E94C06EC20F56A4200672992 /* Release */ = {
>+			isa = XCBuildConfiguration;
>+			buildSettings = {
>+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
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>+				CODE_SIGN_STYLE = Automatic;
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>+				DEVELOPMENT_TEAM = "";
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>+				LD_RUNPATH_SEARCH_PATHS = (
>+					"$(inherited)",
>+					"@executable_path/../Frameworks",
>+				);
>+				PRODUCT_BUNDLE_IDENTIFIER = "com.apple.WHLSL-Toy";
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>+				BUNDLE_LOADER = "$(TEST_HOST)";
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>+				LD_RUNPATH_SEARCH_PATHS = (
>+					"$(inherited)",
>+					"@executable_path/../Frameworks",
>+					"@loader_path/../Frameworks",
>+				);
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>+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/WHLSL Tests.app/Contents/MacOS/WHLSL Tests";
>+			};
>+			name = Debug;
>+		};
>+		E94C06EF20F56A4200672992 /* Release */ = {
>+			isa = XCBuildConfiguration;
>+			buildSettings = {
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>+				LD_RUNPATH_SEARCH_PATHS = (
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>+				PRODUCT_NAME = "$(TARGET_NAME)";
>+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/WHLSL Tests.app/Contents/MacOS/WHLSL Tests";
>+			};
>+			name = Release;
>+		};
>+/* End XCBuildConfiguration section */
>+
>+/* Begin XCConfigurationList section */
>+		E94C06BB20F56A4000672992 /* Build configuration list for PBXProject "WHLSL Tests" */ = {
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>+			buildConfigurations = (
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>+				E94C06EC20F56A4200672992 /* Release */,
>+			);
>+			defaultConfigurationIsVisible = 0;
>+			defaultConfigurationName = Release;
>+		};
>+		E94C06ED20F56A4200672992 /* Build configuration list for PBXNativeTarget "WHLSL TestsTests" */ = {
>+			isa = XCConfigurationList;
>+			buildConfigurations = (
>+				E94C06EE20F56A4200672992 /* Debug */,
>+				E94C06EF20F56A4200672992 /* Release */,
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>+			defaultConfigurationName = Release;
>+		};
>+/* End XCConfigurationList section */
>+	};
>+	rootObject = E94C06B820F56A4000672992 /* Project object */;
>+}
>diff --git a/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist
>new file mode 100644
>index 0000000000000000000000000000000000000000..6c40a6cd0c4af2f0d93b697fbfb066793681b045
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/Info.plist	
>@@ -0,0 +1,22 @@
>+<?xml version="1.0" encoding="UTF-8"?>
>+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
>+<plist version="1.0">
>+<dict>
>+	<key>CFBundleDevelopmentRegion</key>
>+	<string>$(DEVELOPMENT_LANGUAGE)</string>
>+	<key>CFBundleExecutable</key>
>+	<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..555305078c63b7512c4f6e5757f29eb81d689a44
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WHLSL Tests/WHLSL ToyTests/WHLSL_ToyTests.m	
>@@ -0,0 +1,65 @@
>+//
>+//  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 {
>+    TestFamilyRunner* runner = [[TestFamilyRunner alloc] initWithTestFamily:test];
>+    BOOL result = [runner executeAllTests];
>+    if (result)
>+        NSLog(@"\u2705 %@", test.name);
>+    XCTAssert(result, @"%@", test.name);
>+    NSLog(@"Total test case count: %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:@".*" 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/WhlslToMsl.js b/Tools/WebGPUShadingLanguageRI/Metal/WhlslToMsl.js
>new file mode 100644
>index 0000000000000000000000000000000000000000..5c85f2b49b2e3920a281f4e7278f21fc1ff4103f
>--- /dev/null
>+++ b/Tools/WebGPUShadingLanguageRI/Metal/WhlslToMsl.js
>@@ -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.
>+ */
>+
>+// Main wrapper for the compiler. Clients should use this function to compile WHLSL.
>+function whlslToMsl(src)
>+{
>+    let parsedProgram;
>+    try {
>+        parsedProgram = prepare("/internal/test", 0, src);
>+    } catch (e) {
>+        return new MSLCompileResult(null, e, null, null);
>+    }
>+
>+    if (!(parsedProgram instanceof Program))
>+        return new MSLCompileResult(null, new Error("Compilation failed"), null, null);
>+
>+    const compiler = new MSLBackend(parsedProgram);
>+    return compiler.compile();
>+}
>\ No newline at end of file
>diff --git a/Tools/WebGPUShadingLanguageRI/PropertyResolver.js b/Tools/WebGPUShadingLanguageRI/PropertyResolver.js
>index b5c454ac2dc3d534ca5213ef13c3736cd1700344..23184ca5ad2f3aab46416a56adfcbe084ef39b5c 100644
>--- a/Tools/WebGPUShadingLanguageRI/PropertyResolver.js
>+++ b/Tools/WebGPUShadingLanguageRI/PropertyResolver.js
>@@ -168,6 +168,8 @@ class PropertyResolver extends Visitor {
>         super.visitMakePtrExpression(node);
>         if (!node.lValue.isLValue)
>             throw new WTypeError(node.origin.originString, "Not an lvalue: " + node.lValue);
>+        if (node.lValue.unifyNode instanceof DereferenceExpression)
>+            node.become(new IdentityExpression(node.lValue.unifyNode.ptr));
>     }
>     
>     visitMakeArrayRefExpression(node)
>diff --git a/Tools/WebGPUShadingLanguageRI/SynthesizeStructAccessors.js b/Tools/WebGPUShadingLanguageRI/SynthesizeStructAccessors.js
>index a0181468a25ed4c09050d7bf1d61f44ed3a0aa66..24a209433bde0c1bbc2085654a0612c8c65fe9cd 100644
>--- a/Tools/WebGPUShadingLanguageRI/SynthesizeStructAccessors.js
>+++ b/Tools/WebGPUShadingLanguageRI/SynthesizeStructAccessors.js
>@@ -42,6 +42,13 @@ function synthesizeStructAccessors(program)
>                 nativeFunc.implementation = (argumentList, node) => {
>                     return implementation(argumentList, field.offset, type.size, field.type.size);
>                 };
>+
>+                nativeFunc.implementationData = {
>+                    name: field.name,
>+                    type: type,
>+                    offset: field.offset,
>+                    size: field.type.size
>+                };
>             }
>             
>             function createFieldType()
>diff --git a/Tools/WebGPUShadingLanguageRI/Test.js b/Tools/WebGPUShadingLanguageRI/Test.js
>index 2bcea7d7da3cb382f1aabe2167ef3a7891392333..26262450c16235534827407961e11ea302e85797 100644
>--- a/Tools/WebGPUShadingLanguageRI/Test.js
>+++ b/Tools/WebGPUShadingLanguageRI/Test.js
>@@ -55,32 +55,37 @@ function doLex(code)
> 
> function makeInt(program, value)
> {
>-    return TypedValue.box(program.intrinsics.int, value);
>+    return TypedValue.box(program.intrinsics.int, castAndCheckValue(castToInt, value));
> }
> 
> function makeUint(program, value)
> {
>-    return TypedValue.box(program.intrinsics.uint, value);
>+    return TypedValue.box(program.intrinsics.uint, castAndCheckValue(castToUint, value));
> }
> 
> function makeUchar(program, value)
> {
>-    return TypedValue.box(program.intrinsics.uchar, value);
>+    return TypedValue.box(program.intrinsics.uchar, castAndCheckValue(castToUchar, value));
> }
> 
> function makeBool(program, value)
> {
>-    return TypedValue.box(program.intrinsics.bool, value);
>+    return TypedValue.box(program.intrinsics.bool, castAndCheckValue(castToBool, value));
> }
> 
> function makeFloat(program, value)
> {
>-    return TypedValue.box(program.intrinsics.float, value);
>+    return TypedValue.box(program.intrinsics.float, castAndCheckValue(castToFloat, value));
>+}
>+
>+function makeCastedFloat(program, value)
>+{
>+    return TypedValue.box(program.intrinsics.float, castToFloat(value));
> }
> 
> function makeHalf(program, value)
> {
>-    return TypedValue.box(program.intrinsics.half, value);
>+    return TypedValue.box(program.intrinsics.half, castAndCheckValue(castToHalf, value));
> }
> 
> function makeEnum(program, enumName, value)
>@@ -221,19 +226,12 @@ function makeRW2DDepthTextureArray(program, array, elementType)
>     return TypedValue.box(program.intrinsics[`RWTextureDepth2DArray<${elementType}>`], new TextureDepth2DArrayRW(elementType, array));
> }
> 
>-function checkNumber(program, result, expected)
>-{
>-    if (!result.type.unifyNode.isNumber)
>-        throw new Error("Wrong result type; result: " + result);
>-    if (result.value != expected)
>-        throw new Error("Wrong result: " + result.value + " (expected " + expected + ")");
>-}
>-
> function checkInt(program, result, expected)
> {
>     if (!result.type.equals(program.intrinsics.int))
>         throw new Error("Wrong result type; result: " + result);
>-    checkNumber(program, result, expected);
>+    if (result.value != expected)
>+        throw new Error(`Wrong result: ${result.value} (expected ${expected})`);
> }
> 
> function checkEnum(program, result, expected)
>@@ -439,6 +437,27 @@ tests.intSimpleMath = function() {
>     checkInt(program, callFunction(program, "foo", [makeInt(program, 7), makeInt(program, -2)]), -3);
> }
> 
>+tests.incrementAndDecrement = function() {
>+    let program = doPrep(`
>+    test int foo1() { int x = 0; return x++; }
>+    test int foo2() { int x = 0; x++; return x; }
>+    test int foo3() { int x = 0; return ++x; }
>+    test int foo4() { int x = 0; ++x; return x; }
>+    test int foo5() { int x = 0; return x--; }
>+    test int foo6() { int x = 0; x--; return x; }
>+    test int foo7() { int x = 0; return --x; }
>+    test int foo8() { int x = 0; --x; return x; }
>+    `);
>+    checkInt(program, callFunction(program, "foo1", []), 0);
>+    checkInt(program, callFunction(program, "foo2", []), 1);
>+    checkInt(program, callFunction(program, "foo3", []), 1);
>+    checkInt(program, callFunction(program, "foo4", []), 1);
>+    checkInt(program, callFunction(program, "foo5", []), 0);
>+    checkInt(program, callFunction(program, "foo6", []), -1);
>+    checkInt(program, callFunction(program, "foo7", []), -1);
>+    checkInt(program, callFunction(program, "foo8", []), -1);
>+}
>+
> tests.uintSimpleMath = function() {
>     let program = doPrep("test uint foo(uint x, uint y) { return x + y; }");
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 7), makeUint(program, 5)]), 12);
>@@ -1039,13 +1058,13 @@ tests.passNullToPtrMonomorphicArrayRef = function()
> tests.returnIntLiteralUint = function()
> {
>     let program = doPrep("test uint foo() { return 42; }");
>-    checkNumber(program, callFunction(program, "foo", []), 42);
>+    checkUint(program, callFunction(program, "foo", []), 42);
> }
> 
> tests.returnIntLiteralFloat = function()
> {
>     let program = doPrep("test float foo() { return 42; }");
>-    checkNumber(program, callFunction(program, "foo", []), 42);
>+    checkFloat(program, callFunction(program, "foo", []), 42);
> }
> 
> tests.badIntLiteralForInt = function()
>@@ -2355,6 +2374,149 @@ tests.nestedSubscriptLValueEmulationSimple = function()
>     checkInt(program, callFunction(program, "testSetValuesMutateValuesAndSum", []), 5565);
> }
> 
>+tests.nestedSubscriptWithArraysInStructs = function()
>+{
>+    let program = doPrep(`
>+        struct Foo {
>+            int[7] array;
>+        }
>+        int sum(Foo foo)
>+        {
>+            int result = 0;
>+            for (uint i = 0; i < foo.array.length; i++)
>+                result += foo.array[i];
>+            return result;
>+        }
>+        struct Bar {
>+            Foo[6] array;
>+        }
>+        int sum(Bar bar)
>+        {
>+            int result = 0;
>+            for (uint i = 0; i < bar.array.length; i++)
>+                result += sum(bar.array[i]);
>+            return result;
>+        }
>+        struct Baz {
>+            Bar[5] array;
>+        }
>+        int sum(Baz baz)
>+        {
>+            int result = 0;
>+            for (uint i = 0; i < baz.array.length; i++)
>+                result += sum(baz.array[i]);
>+            return result;
>+        }
>+        void setValues(thread Baz* baz)
>+        {
>+            for (uint i = 0; i < baz->array.length; i++) {
>+                for (uint j = 0; j < baz->array[i].array.length; j++) {
>+                    for (uint k = 0; k < baz->array[i].array[j].array.length; k++)
>+                        baz->array[i].array[j].array[k] = int(i + j + k);
>+                }
>+            }
>+        }
>+        test int testSetValuesAndSum()
>+        {
>+            Baz baz;
>+            setValues(&baz);
>+            return sum(baz);
>+        }
>+        test int testSetValuesMutateValuesAndSum()
>+        {
>+            Baz baz;
>+            setValues(&baz);
>+            for (uint i = baz.array.length; i--;) {
>+                for (uint j = baz.array[i].array.length; j--;) {
>+                    for (uint k = baz.array[i].array[j].array.length; k--;)
>+                        baz.array[i].array[j].array[k] = baz.array[i].array[j].array[k] * int(k);
>+                }
>+            }
>+            return sum(baz);
>+        }
>+    `);
>+    checkInt(program, callFunction(program, "testSetValuesAndSum", []), 1575);
>+    checkInt(program, callFunction(program, "testSetValuesMutateValuesAndSum", []), 5565);
>+}
>+
>+tests.nestedSubscript = function()
>+{
>+    let program = doPrep(`
>+        int sum(int[7] array)
>+        {
>+            int result = 0;
>+            for (uint i = array.length; i--;)
>+                result += array[i];
>+            return result;
>+        }
>+        int sum(int[6][7] array)
>+        {
>+            int result = 0;
>+            for (uint i = array.length; i--;)
>+                result += sum(array[i]);
>+            return result;
>+        }
>+        int sum(int[5][6][7] array)
>+        {
>+            int result = 0;
>+            for (uint i = array.length; i--;)
>+                result += sum(array[i]);
>+            return result;
>+        }
>+        void setValues(thread int[][6][7] array)
>+        {
>+            for (uint i = array.length; i--;) {
>+                for (uint j = array[i].length; j--;) {
>+                    for (uint k = array[i][j].length; k--;)
>+                        array[i][j][k] = int(i + j + k);
>+                }
>+            }
>+        }
>+        test int testSetValuesAndSum()
>+        {
>+            int[5][6][7] array;
>+            setValues(@array);
>+            return sum(array);
>+        }
>+        test int testSetValuesMutateValuesAndSum()
>+        {
>+            int[5][6][7] array;
>+            setValues(@array);
>+            for (uint i = array.length; i--;) {
>+                for (uint j = array[i].length; j--;) {
>+                    for (uint k = array[i][j].length; k--;)
>+                        array[i][j][k] = array[i][j][k] * int(k);
>+                }
>+            }
>+            return sum(array);
>+        }
>+    `);
>+    checkInt(program, callFunction(program, "testSetValuesAndSum", []), 1575);
>+    checkInt(program, callFunction(program, "testSetValuesMutateValuesAndSum", []), 5565);
>+}
>+
>+tests.lotsOfLocalVariables = function()
>+{
>+    let src = "test int sum() {\n";
>+    src += "    int i = 0;\n";
>+    let target = 0;
>+    const numVars = 1024;
>+    for (let i = 0; i < numVars; i++) {
>+        const value = i * 3;
>+        src += `   i = ${i};\n`;
>+        src += `   int V${i} = (i + 3) * (i + 3);\n`;
>+        target += (i + 3) * (i + 3);
>+    }
>+    src += "    int result = 0;\n";
>+    for (let i = 0; i < numVars; i++) {
>+        src += `    result += V${i};\n`;
>+    }
>+    src += "    return result;\n";
>+    src += "}";
>+    let program = doPrep(src);
>+    checkInt(program, callFunction(program, "sum", []), target);
>+}
>+
> tests.operatorBool = function()
> {
>     let program = doPrep(`
>@@ -2552,7 +2714,6 @@ tests.uintBitAnd = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1), makeUint(program, 7)]), 1);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535), makeUint(program, 42)]), 42);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1), makeUint(program, -7)]), 4294967289);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0), makeUint(program, 85732)]), 0);
> }
> 
>@@ -2566,7 +2727,6 @@ tests.uintBitOr = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1), makeUint(program, 7)]), 7);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535), makeUint(program, 42)]), 65535);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1), makeUint(program, -7)]), 4294967295);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0), makeUint(program, 85732)]), 85732);
> }
> 
>@@ -2580,7 +2740,6 @@ tests.uintBitXor = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1), makeUint(program, 7)]), 6);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535), makeUint(program, 42)]), 65493);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1), makeUint(program, -7)]), 6);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0), makeUint(program, 85732)]), 85732);
> }
> 
>@@ -2594,7 +2753,6 @@ tests.uintBitNot = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1)]), 4294967294);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535)]), 4294901760);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1)]), 0);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0)]), 4294967295);
> }
> 
>@@ -2608,7 +2766,6 @@ tests.uintLShift = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1), makeUint(program, 7)]), 128);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535), makeUint(program, 2)]), 262140);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1), makeUint(program, 5)]), 4294967264);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0), makeUint(program, 3)]), 0);
> }
> 
>@@ -2622,7 +2779,6 @@ tests.uintRShift = function()
>     `);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 1), makeUint(program, 7)]), 0);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 65535), makeUint(program, 2)]), 16383);
>-    checkUint(program, callFunction(program, "foo", [makeUint(program, -1), makeUint(program, 5)]), 134217727);
>     checkUint(program, callFunction(program, "foo", [makeUint(program, 0), makeUint(program, 3)]), 0);
> }
> 
>@@ -2635,9 +2791,8 @@ tests.ucharBitAnd = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1), makeUchar(program, 7)]), 1);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535), makeUchar(program, 42)]), 42);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1), makeUchar(program, -7)]), 249);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 85732)]), 0);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUchar(program, 42)]), 42);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 255)]), 0);
> }
> 
> tests.ucharBitOr = function()
>@@ -2649,9 +2804,8 @@ tests.ucharBitOr = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1), makeUchar(program, 7)]), 7);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535), makeUchar(program, 42)]), 255);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1), makeUchar(program, -7)]), 255);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 85732)]), 228);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUchar(program, 42)]), 255);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 228)]), 228);
> }
> 
> tests.ucharBitXor = function()
>@@ -2663,9 +2817,8 @@ tests.ucharBitXor = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1), makeUchar(program, 7)]), 6);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535), makeUchar(program, 42)]), 213);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1), makeUchar(program, -7)]), 6);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 85732)]), 228);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUchar(program, 42)]), 213);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUchar(program, 255)]), 255);
> }
> 
> tests.ucharBitNot = function()
>@@ -2677,8 +2830,7 @@ tests.ucharBitNot = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1)]), 254);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535)]), 0);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1)]), 0);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255)]), 0);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0)]), 255);
> }
> 
>@@ -2691,8 +2843,7 @@ tests.ucharLShift = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1), makeUint(program, 7)]), 128);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535), makeUint(program, 2)]), 252);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1), makeUint(program, 5)]), 224);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUint(program, 2)]), 252);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUint(program, 3)]), 0);
> }
> 
>@@ -2705,8 +2856,8 @@ tests.ucharRShift = function()
>         }
>     `);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 1), makeUint(program, 7)]), 0);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 65535), makeUint(program, 2)]), 255);
>-    checkUchar(program, callFunction(program, "foo", [makeUchar(program, -1), makeUint(program, 5)]), 255);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUint(program, 2)]), 63);
>+    checkUchar(program, callFunction(program, "foo", [makeUchar(program, 255), makeUint(program, 5)]), 7);
>     checkUchar(program, callFunction(program, "foo", [makeUchar(program, 0), makeUint(program, 3)]), 0);
> }
> 
>@@ -7293,14 +7444,14 @@ tests.textureSample = function() {
>     checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>-    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>-    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>+    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (35 + 36 + 39 + 40) / 4);
>-    checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>-    checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>+    checkFloat(program, callFunction(program, "foo15", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo16", [texture2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo16", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo16", [texture2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0.5)]), (12 + 13 + 20 + 21) / 4);
>@@ -7326,25 +7477,25 @@ tests.textureSample = function() {
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>-    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>-    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>+    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (76 + 77 + 80 + 81) / 4);
>-    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>-    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((54 + 55 + 62 + 63) / 4) + ((76 + 77 + 80 + 81) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>+    checkFloat(program, callFunction(program, "foo20", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((54 + 55 + 62 + 63) / 4) + ((76 + 77 + 80 + 81) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (35 + 36 + 39 + 40) / 4);
>-    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>-    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>+    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>     checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (77 + 78 + 81 + 82) / 4);
>-    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>-    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((55 + 56 + 63 + 64) / 4) + ((77 + 78 + 81 + 82) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>+    checkFloat(program, callFunction(program, "foo21", [texture2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((55 + 56 + 63 + 64) / 4) + ((77 + 78 + 81 + 82) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo22", [texture2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo22", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo22", [texture2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0.5)]), (12 + 13 + 20 + 21) / 4);
>@@ -7372,7 +7523,7 @@ tests.textureSample = function() {
>     checkFloat(program, callFunction(program, "foo16", [texture2D, makeSampler(program, {minFilter: "linear", lodMinClamp: 1, lodMaxClamp: 1}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo16", [texture2D, makeSampler(program, {minFilter: "linear", lodMinClamp: 1, lodMaxClamp: 1}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>-    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear", maxAnisotropy: 2}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 4 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, (4/3) / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>+    checkFloat(program, callFunction(program, "foo14", [texture2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear", maxAnisotropy: 2}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 4 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, (4/3) / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>     let texture1DInt4 = make1DTexture(program, [[[1, 2, 3, 4], [100, 200, 300, 400], [101, 202, 301, 401], [13, 14, 15, 16]], [[17, 18, 19, 20], [21, 22, 23, 24]], [[25, 26, 27, 28]]], "int4");
>     checkInt(program, callFunction(program, "foo24", [texture1DInt4, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5)]), 100);
>     checkInt(program, callFunction(program, "foo25", [texture1DInt4, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5)]), 201);
>@@ -7414,14 +7565,14 @@ tests.textureSample = function() {
>     checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>-    checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>-    checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>+    checkFloat(program, callFunction(program, "foo35", [textureDepth2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (35 + 36 + 39 + 40) / 4);
>-    checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>-    checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>+    checkFloat(program, callFunction(program, "foo36", [textureDepth2D, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo37", [textureDepth2D, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo37", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo37", [textureDepth2D, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0.5)]), (12 + 13 + 20 + 21) / 4);
>@@ -7447,25 +7598,25 @@ tests.textureSample = function() {
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (34 + 35 + 38 + 39) / 4);
>-    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>-    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (12 + 13 + 20 + 21) / 4);
>+    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((12 + 13 + 20 + 21) / 4) + ((34 + 35 + 38 + 39) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height)]), (76 + 77 + 80 + 81) / 4);
>-    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>-    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((54 + 55 + 62 + 63) / 4) + ((76 + 77 + 80 + 81) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height)]), (54 + 55 + 62 + 63) / 4);
>+    checkFloat(program, callFunction(program, "foo41", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height)]), (((54 + 55 + 62 + 63) / 4) + ((76 + 77 + 80 + 81) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (35 + 36 + 39 + 40) / 4);
>-    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>-    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (13 + 14 + 21 + 22) / 4);
>+    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((13 + 14 + 21 + 22) / 4) + ((35 + 36 + 39 + 40) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 0), makeInt(program, 0)]), (54 + 55 + 62 + 63) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 0), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 1 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 1 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>     checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, 2 / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, 2 / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (77 + 78 + 81 + 82) / 4);
>-    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>-    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((55 + 56 + 63 + 64) / 4) + ((77 + 78 + 81 + 82) / 4)) / 2);
>+    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.25) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (55 + 56 + 63 + 64) / 4);
>+    checkFloat(program, callFunction(program, "foo42", [textureDepth2DArray, makeSampler(program, {minFilter: "linear", mipmapFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 1), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().width), makeFloat(program, 0), makeFloat(program, 0), makeCastedFloat(program, Math.pow(2, 0.5) / texture2D.ePtr.loadValue().height), makeInt(program, 1), makeInt(program, 0)]), (((55 + 56 + 63 + 64) / 4) + ((77 + 78 + 81 + 82) / 4)) / 2);
>     checkFloat(program, callFunction(program, "foo43", [textureDepth2DArray, makeSampler(program, {magFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0)]), (12 + 13 + 20 + 21) / 4);
>     checkFloat(program, callFunction(program, "foo43", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 1)]), (34 + 35 + 38 + 39) / 4);
>     checkFloat(program, callFunction(program, "foo43", [textureDepth2DArray, makeSampler(program, {minFilter: "linear"}), makeFloat(program, 0.5), makeFloat(program, 0.5), makeFloat(program, 0), makeFloat(program, 0.5)]), (12 + 13 + 20 + 21) / 4);
>@@ -7924,9 +8075,44 @@ tests.inliningDoesntProduceAliasingIssues = () => {
>     checkInt(program, callFunction(program, "foo", []), 20);
> }
> 
>+// FIXME: These won't work in the interpreter because it throws exceptions on traps rather than returning zero.
>+
>+tests.NEW_trapBecauseOfIndexAcesss = () => {
>+    const program = doPrep(`
>+        test int foo()
>+        {
>+            int[5] array;
>+            array[6] = 42;
>+            return array[6];
>+        }
>+    `);
>+    checkInt(program, callFunction(program, "foo", []), 0);
>+}
>+
>+tests.NEW_trapTransitively = () => {
>+    const program = doPrep(`
>+        test int foo()
>+        {
>+            willTrapTransitively();
>+            return 42;
>+        }
>+
>+        void willTrapTransitively()
>+        {
>+            doTrap();
>+        }
>+
>+        void doTrap()
>+        {
>+            trap;
>+        }
>+    `);
>+    checkInt(program, callFunction(program, "foo", []), 0);
>+};
>+
> okToTest = true;
> 
>-let testFilter = /.*/; // run everything by default
>+let testFilter = /trap/; // run everything by default
> let testExclusionFilter = /^DISABLED_/;
> if (this["arguments"]) {
>     for (let i = 0; i < arguments.length; i++) {
>@@ -7946,13 +8132,6 @@ function* doTest(testFilter)
>         throw new Error("Test setup is incomplete.");
>     let before = preciseTime();
> 
>-    print("Compiling standard library...");
>-    const compileBefore = preciseTime();
>-    yield;
>-    prepare();
>-    const compileAfter = preciseTime();
>-    print(`    OK, took ${Math.round((compileAfter - compileBefore) * 1000)} ms`);
>-
>     let names = [];
>     for (let s in tests)
>         names.push(s);
>@@ -7978,7 +8157,7 @@ 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/Type.js b/Tools/WebGPUShadingLanguageRI/Type.js
>index 2db158d099b326a93e7335e4e696138c5edbefdb..9a5e56e501d8e81e0a85a5f5c2960eb462eccbb3 100644
>--- a/Tools/WebGPUShadingLanguageRI/Type.js
>+++ b/Tools/WebGPUShadingLanguageRI/Type.js
>@@ -36,6 +36,11 @@ class Type extends Node {
>     get isEnum() { return false; }
>     get isPrimitive() { return false; }
>     
>+    get arrayRefType()
>+    {
>+        return new ArrayRefType(this.origin, "thread", this);
>+    }
>+
>     // Have to call these on the unifyNode.
>     argumentForAndOverload(origin, value)
>     {

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Attachments on bug 189615: 349823 | 349935 | 350228 | 350233 | 350237 | 350438 | 350732 | 350733