| // |
| // Copyright (c) 2016 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| // TranslatorVulkan: |
| // A GLSL-based translator that outputs shaders that fit GL_KHR_vulkan_glsl. |
| // The shaders are then fed into glslang to spit out SPIR-V (libANGLE-side). |
| // See: https://www.khronos.org/registry/vulkan/specs/misc/GL_KHR_vulkan_glsl.txt |
| // |
| |
| #include "compiler/translator/TranslatorVulkan.h" |
| |
| #include "angle_gl.h" |
| #include "common/utilities.h" |
| #include "compiler/translator/ImmutableStringBuilder.h" |
| #include "compiler/translator/OutputVulkanGLSL.h" |
| #include "compiler/translator/StaticType.h" |
| #include "compiler/translator/tree_ops/NameEmbeddedUniformStructs.h" |
| #include "compiler/translator/tree_ops/RewriteAtomicCounters.h" |
| #include "compiler/translator/tree_ops/RewriteDfdy.h" |
| #include "compiler/translator/tree_ops/RewriteStructSamplers.h" |
| #include "compiler/translator/tree_util/BuiltIn_autogen.h" |
| #include "compiler/translator/tree_util/FindFunction.h" |
| #include "compiler/translator/tree_util/FindMain.h" |
| #include "compiler/translator/tree_util/IntermNode_util.h" |
| #include "compiler/translator/tree_util/ReplaceVariable.h" |
| #include "compiler/translator/tree_util/RunAtTheEndOfShader.h" |
| #include "compiler/translator/util.h" |
| |
| namespace sh |
| { |
| |
| namespace |
| { |
| // This traverses nodes, find the struct ones and add their declarations to the sink. It also |
| // removes the nodes from the tree as it processes them. |
| class DeclareStructTypesTraverser : public TIntermTraverser |
| { |
| public: |
| explicit DeclareStructTypesTraverser(TOutputVulkanGLSL *outputVulkanGLSL) |
| : TIntermTraverser(true, false, false), mOutputVulkanGLSL(outputVulkanGLSL) |
| {} |
| |
| bool visitDeclaration(Visit visit, TIntermDeclaration *node) override |
| { |
| ASSERT(visit == PreVisit); |
| |
| if (!mInGlobalScope) |
| { |
| return false; |
| } |
| |
| const TIntermSequence &sequence = *(node->getSequence()); |
| TIntermTyped *declarator = sequence.front()->getAsTyped(); |
| const TType &type = declarator->getType(); |
| |
| if (type.isStructSpecifier()) |
| { |
| const TStructure *structure = type.getStruct(); |
| |
| // Embedded structs should be parsed away by now. |
| ASSERT(structure->symbolType() != SymbolType::Empty); |
| mOutputVulkanGLSL->writeStructType(structure); |
| |
| TIntermSymbol *symbolNode = declarator->getAsSymbolNode(); |
| if (symbolNode && symbolNode->variable().symbolType() == SymbolType::Empty) |
| { |
| // Remove the struct specifier declaration from the tree so it isn't parsed again. |
| TIntermSequence emptyReplacement; |
| mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node, |
| emptyReplacement); |
| } |
| } |
| |
| return false; |
| } |
| |
| private: |
| TOutputVulkanGLSL *mOutputVulkanGLSL; |
| }; |
| |
| class DeclareDefaultUniformsTraverser : public TIntermTraverser |
| { |
| public: |
| DeclareDefaultUniformsTraverser(TInfoSinkBase *sink, |
| ShHashFunction64 hashFunction, |
| NameMap *nameMap) |
| : TIntermTraverser(true, true, true), |
| mSink(sink), |
| mHashFunction(hashFunction), |
| mNameMap(nameMap), |
| mInDefaultUniform(false) |
| {} |
| |
| bool visitDeclaration(Visit visit, TIntermDeclaration *node) override |
| { |
| const TIntermSequence &sequence = *(node->getSequence()); |
| |
| // TODO(jmadill): Compound declarations. |
| ASSERT(sequence.size() == 1); |
| |
| TIntermTyped *variable = sequence.front()->getAsTyped(); |
| const TType &type = variable->getType(); |
| bool isUniform = type.getQualifier() == EvqUniform && !type.isInterfaceBlock() && |
| !IsOpaqueType(type.getBasicType()); |
| |
| if (visit == PreVisit) |
| { |
| if (isUniform) |
| { |
| (*mSink) << " " << GetTypeName(type, mHashFunction, mNameMap) << " "; |
| mInDefaultUniform = true; |
| } |
| } |
| else if (visit == InVisit) |
| { |
| mInDefaultUniform = isUniform; |
| } |
| else if (visit == PostVisit) |
| { |
| if (isUniform) |
| { |
| (*mSink) << ";\n"; |
| |
| // Remove the uniform declaration from the tree so it isn't parsed again. |
| TIntermSequence emptyReplacement; |
| mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), node, |
| emptyReplacement); |
| } |
| |
| mInDefaultUniform = false; |
| } |
| return true; |
| } |
| |
| void visitSymbol(TIntermSymbol *symbol) override |
| { |
| if (mInDefaultUniform) |
| { |
| const ImmutableString &name = symbol->variable().name(); |
| ASSERT(!name.beginsWith("gl_")); |
| (*mSink) << HashName(&symbol->variable(), mHashFunction, mNameMap) |
| << ArrayString(symbol->getType()); |
| } |
| } |
| |
| private: |
| TInfoSinkBase *mSink; |
| ShHashFunction64 mHashFunction; |
| NameMap *mNameMap; |
| bool mInDefaultUniform; |
| }; |
| |
| constexpr ImmutableString kFlippedPointCoordName = ImmutableString("flippedPointCoord"); |
| constexpr ImmutableString kFlippedFragCoordName = ImmutableString("flippedFragCoord"); |
| constexpr ImmutableString kEmulatedDepthRangeParams = ImmutableString("ANGLEDepthRangeParams"); |
| constexpr ImmutableString kUniformsBlockName = ImmutableString("ANGLEUniformBlock"); |
| constexpr ImmutableString kUniformsVarName = ImmutableString("ANGLEUniforms"); |
| |
| constexpr const char kViewport[] = "viewport"; |
| constexpr const char kHalfRenderAreaHeight[] = "halfRenderAreaHeight"; |
| constexpr const char kViewportYScale[] = "viewportYScale"; |
| constexpr const char kNegViewportYScale[] = "negViewportYScale"; |
| constexpr const char kXfbActiveUnpaused[] = "xfbActiveUnpaused"; |
| constexpr const char kXfbBufferOffsets[] = "xfbBufferOffsets"; |
| constexpr const char kAcbBufferOffsets[] = "acbBufferOffsets"; |
| constexpr const char kDepthRange[] = "depthRange"; |
| |
| constexpr size_t kNumGraphicsDriverUniforms = 8; |
| constexpr std::array<const char *, kNumGraphicsDriverUniforms> kGraphicsDriverUniformNames = { |
| {kViewport, kHalfRenderAreaHeight, kViewportYScale, kNegViewportYScale, kXfbActiveUnpaused, |
| kXfbBufferOffsets, kAcbBufferOffsets, kDepthRange}}; |
| |
| constexpr size_t kNumComputeDriverUniforms = 1; |
| constexpr std::array<const char *, kNumComputeDriverUniforms> kComputeDriverUniformNames = { |
| {kAcbBufferOffsets}}; |
| |
| size_t FindFieldIndex(const TFieldList &fieldList, const char *fieldName) |
| { |
| for (size_t fieldIndex = 0; fieldIndex < fieldList.size(); ++fieldIndex) |
| { |
| if (strcmp(fieldList[fieldIndex]->name().data(), fieldName) == 0) |
| { |
| return fieldIndex; |
| } |
| } |
| UNREACHABLE(); |
| return 0; |
| } |
| |
| TIntermBinary *CreateDriverUniformRef(const TVariable *driverUniforms, const char *fieldName) |
| { |
| size_t fieldIndex = |
| FindFieldIndex(driverUniforms->getType().getInterfaceBlock()->fields(), fieldName); |
| |
| TIntermSymbol *angleUniformsRef = new TIntermSymbol(driverUniforms); |
| TConstantUnion *uniformIndex = new TConstantUnion; |
| uniformIndex->setIConst(fieldIndex); |
| TIntermConstantUnion *indexRef = |
| new TIntermConstantUnion(uniformIndex, *StaticType::GetBasic<EbtInt>()); |
| return new TIntermBinary(EOpIndexDirectInterfaceBlock, angleUniformsRef, indexRef); |
| } |
| |
| // Replaces a builtin variable with a version that corrects the Y coordinate. |
| void FlipBuiltinVariable(TIntermBlock *root, |
| TIntermSequence *insertSequence, |
| TIntermTyped *viewportYScale, |
| TSymbolTable *symbolTable, |
| const TVariable *builtin, |
| const ImmutableString &flippedVariableName, |
| TIntermTyped *pivot) |
| { |
| // Create a symbol reference to 'builtin'. |
| TIntermSymbol *builtinRef = new TIntermSymbol(builtin); |
| |
| // Create a swizzle to "builtin.y" |
| TVector<int> swizzleOffsetY = {1}; |
| TIntermSwizzle *builtinY = new TIntermSwizzle(builtinRef, swizzleOffsetY); |
| |
| // Create a symbol reference to our new variable that will hold the modified builtin. |
| const TType *type = StaticType::GetForVec<EbtFloat>( |
| EvqGlobal, static_cast<unsigned char>(builtin->getType().getNominalSize())); |
| TVariable *replacementVar = |
| new TVariable(symbolTable, flippedVariableName, type, SymbolType::AngleInternal); |
| DeclareGlobalVariable(root, replacementVar); |
| TIntermSymbol *flippedBuiltinRef = new TIntermSymbol(replacementVar); |
| |
| // Use this new variable instead of 'builtin' everywhere. |
| ReplaceVariable(root, builtin, replacementVar); |
| |
| // Create the expression "(builtin.y - pivot) * viewportYScale + pivot |
| TIntermBinary *removePivot = new TIntermBinary(EOpSub, builtinY, pivot); |
| TIntermBinary *inverseY = new TIntermBinary(EOpMul, removePivot, viewportYScale); |
| TIntermBinary *plusPivot = new TIntermBinary(EOpAdd, inverseY, pivot->deepCopy()); |
| |
| // Create the corrected variable and copy the value of the original builtin. |
| TIntermSequence *sequence = new TIntermSequence(); |
| sequence->push_back(builtinRef); |
| TIntermAggregate *aggregate = TIntermAggregate::CreateConstructor(builtin->getType(), sequence); |
| TIntermBinary *assignment = new TIntermBinary(EOpInitialize, flippedBuiltinRef, aggregate); |
| |
| // Create an assignment to the replaced variable's y. |
| TIntermSwizzle *correctedY = new TIntermSwizzle(flippedBuiltinRef, swizzleOffsetY); |
| TIntermBinary *assignToY = new TIntermBinary(EOpAssign, correctedY, plusPivot); |
| |
| // Add this assigment at the beginning of the main function |
| insertSequence->insert(insertSequence->begin(), assignToY); |
| insertSequence->insert(insertSequence->begin(), assignment); |
| } |
| |
| TIntermSequence *GetMainSequence(TIntermBlock *root) |
| { |
| TIntermFunctionDefinition *main = FindMain(root); |
| return main->getBody()->getSequence(); |
| } |
| |
| // Declares a new variable to replace gl_DepthRange, its values are fed from a driver uniform. |
| void ReplaceGLDepthRangeWithDriverUniform(TIntermBlock *root, |
| const TVariable *driverUniforms, |
| TSymbolTable *symbolTable) |
| { |
| // Create a symbol reference to "gl_DepthRange" |
| const TVariable *depthRangeVar = static_cast<const TVariable *>( |
| symbolTable->findBuiltIn(ImmutableString("gl_DepthRange"), 0)); |
| |
| // ANGLEUniforms.depthRange |
| TIntermBinary *angleEmulatedDepthRangeRef = CreateDriverUniformRef(driverUniforms, kDepthRange); |
| |
| // Use this variable instead of gl_DepthRange everywhere. |
| ReplaceVariableWithTyped(root, depthRangeVar, angleEmulatedDepthRangeRef); |
| } |
| |
| // This operation performs the viewport depth translation needed by Vulkan. In GL the viewport |
| // transformation is slightly different - see the GL 2.0 spec section "2.12.1 Controlling the |
| // Viewport". In Vulkan the corresponding spec section is currently "23.4. Coordinate |
| // Transformations". |
| // The equations reduce to an expression: |
| // |
| // z_vk = 0.5 * (w_gl + z_gl) |
| // |
| // where z_vk is the depth output of a Vulkan vertex shader and z_gl is the same for GL. |
| void AppendVertexShaderDepthCorrectionToMain(TIntermBlock *root, TSymbolTable *symbolTable) |
| { |
| // Create a symbol reference to "gl_Position" |
| const TVariable *position = BuiltInVariable::gl_Position(); |
| TIntermSymbol *positionRef = new TIntermSymbol(position); |
| |
| // Create a swizzle to "gl_Position.z" |
| TVector<int> swizzleOffsetZ = {2}; |
| TIntermSwizzle *positionZ = new TIntermSwizzle(positionRef, swizzleOffsetZ); |
| |
| // Create a constant "0.5" |
| TIntermConstantUnion *oneHalf = CreateFloatNode(0.5f); |
| |
| // Create a swizzle to "gl_Position.w" |
| TVector<int> swizzleOffsetW = {3}; |
| TIntermSwizzle *positionW = new TIntermSwizzle(positionRef->deepCopy(), swizzleOffsetW); |
| |
| // Create the expression "(gl_Position.z + gl_Position.w) * 0.5". |
| TIntermBinary *zPlusW = new TIntermBinary(EOpAdd, positionZ->deepCopy(), positionW->deepCopy()); |
| TIntermBinary *halfZPlusW = new TIntermBinary(EOpMul, zPlusW, oneHalf->deepCopy()); |
| |
| // Create the assignment "gl_Position.z = (gl_Position.z + gl_Position.w) * 0.5" |
| TIntermTyped *positionZLHS = positionZ->deepCopy(); |
| TIntermBinary *assignment = new TIntermBinary(TOperator::EOpAssign, positionZLHS, halfZPlusW); |
| |
| // Append the assignment as a statement at the end of the shader. |
| RunAtTheEndOfShader(root, assignment, symbolTable); |
| } |
| |
| void AppendVertexShaderTransformFeedbackOutputToMain(TIntermBlock *root, TSymbolTable *symbolTable) |
| { |
| TVariable *xfbPlaceholder = new TVariable(symbolTable, ImmutableString("@@ XFB-OUT @@"), |
| new TType(), SymbolType::AngleInternal); |
| |
| // Append the assignment as a statement at the end of the shader. |
| RunAtTheEndOfShader(root, new TIntermSymbol(xfbPlaceholder), symbolTable); |
| } |
| |
| // The Add*DriverUniformsToShader operation adds an internal uniform block to a shader. The driver |
| // block is used to implement Vulkan-specific features and workarounds. Returns the driver uniforms |
| // variable. |
| // |
| // There are Graphics and Compute variations as they require different uniforms. |
| const TVariable *AddGraphicsDriverUniformsToShader(TIntermBlock *root, TSymbolTable *symbolTable) |
| { |
| // Init the depth range type. |
| TFieldList *depthRangeParamsFields = new TFieldList(); |
| depthRangeParamsFields->push_back(new TField(new TType(EbtFloat, EbpHigh, EvqGlobal, 1, 1), |
| ImmutableString("near"), TSourceLoc(), |
| SymbolType::AngleInternal)); |
| depthRangeParamsFields->push_back(new TField(new TType(EbtFloat, EbpHigh, EvqGlobal, 1, 1), |
| ImmutableString("far"), TSourceLoc(), |
| SymbolType::AngleInternal)); |
| depthRangeParamsFields->push_back(new TField(new TType(EbtFloat, EbpHigh, EvqGlobal, 1, 1), |
| ImmutableString("diff"), TSourceLoc(), |
| SymbolType::AngleInternal)); |
| depthRangeParamsFields->push_back(new TField(new TType(EbtFloat, EbpHigh, EvqGlobal, 1, 1), |
| ImmutableString("dummyPacker"), TSourceLoc(), |
| SymbolType::AngleInternal)); |
| TStructure *emulatedDepthRangeParams = new TStructure( |
| symbolTable, kEmulatedDepthRangeParams, depthRangeParamsFields, SymbolType::AngleInternal); |
| TType *emulatedDepthRangeType = new TType(emulatedDepthRangeParams, false); |
| |
| // Declare a global depth range variable. |
| TVariable *depthRangeVar = |
| new TVariable(symbolTable->nextUniqueId(), kEmptyImmutableString, SymbolType::Empty, |
| TExtension::UNDEFINED, emulatedDepthRangeType); |
| |
| DeclareGlobalVariable(root, depthRangeVar); |
| |
| // This field list mirrors the structure of GraphicsDriverUniforms in ContextVk.cpp. |
| TFieldList *driverFieldList = new TFieldList; |
| |
| const std::array<TType *, kNumGraphicsDriverUniforms> kDriverUniformTypes = {{ |
| new TType(EbtFloat, 4), |
| new TType(EbtFloat), |
| new TType(EbtFloat), |
| new TType(EbtFloat), |
| new TType(EbtUInt), |
| new TType(EbtInt, 4), |
| new TType(EbtUInt, 4), |
| emulatedDepthRangeType, |
| }}; |
| |
| for (size_t uniformIndex = 0; uniformIndex < kNumGraphicsDriverUniforms; ++uniformIndex) |
| { |
| TField *driverUniformField = |
| new TField(kDriverUniformTypes[uniformIndex], |
| ImmutableString(kGraphicsDriverUniformNames[uniformIndex]), TSourceLoc(), |
| SymbolType::AngleInternal); |
| driverFieldList->push_back(driverUniformField); |
| } |
| |
| // Define a driver uniform block "ANGLEUniformBlock" with instance name "ANGLEUniforms". |
| return DeclareInterfaceBlock(root, symbolTable, driverFieldList, EvqUniform, |
| TMemoryQualifier::Create(), 0, kUniformsBlockName, |
| kUniformsVarName); |
| } |
| |
| const TVariable *AddComputeDriverUniformsToShader(TIntermBlock *root, TSymbolTable *symbolTable) |
| { |
| // This field list mirrors the structure of ComputeDriverUniforms in ContextVk.cpp. |
| TFieldList *driverFieldList = new TFieldList; |
| |
| const std::array<TType *, kNumComputeDriverUniforms> kDriverUniformTypes = {{ |
| new TType(EbtUInt, 4), |
| }}; |
| |
| for (size_t uniformIndex = 0; uniformIndex < kNumComputeDriverUniforms; ++uniformIndex) |
| { |
| TField *driverUniformField = |
| new TField(kDriverUniformTypes[uniformIndex], |
| ImmutableString(kComputeDriverUniformNames[uniformIndex]), TSourceLoc(), |
| SymbolType::AngleInternal); |
| driverFieldList->push_back(driverUniformField); |
| } |
| |
| // Define a driver uniform block "ANGLEUniformBlock" with instance name "ANGLEUniforms". |
| return DeclareInterfaceBlock(root, symbolTable, driverFieldList, EvqUniform, |
| TMemoryQualifier::Create(), 0, kUniformsBlockName, |
| kUniformsVarName); |
| } |
| |
| TIntermPreprocessorDirective *GenerateLineRasterIfDef() |
| { |
| return new TIntermPreprocessorDirective( |
| PreprocessorDirective::Ifdef, ImmutableString("ANGLE_ENABLE_LINE_SEGMENT_RASTERIZATION")); |
| } |
| |
| TIntermPreprocessorDirective *GenerateEndIf() |
| { |
| return new TIntermPreprocessorDirective(PreprocessorDirective::Endif, kEmptyImmutableString); |
| } |
| |
| TVariable *AddANGLEPositionVaryingDeclaration(TIntermBlock *root, |
| TSymbolTable *symbolTable, |
| TQualifier qualifier) |
| { |
| TIntermSequence *insertSequence = new TIntermSequence; |
| |
| insertSequence->push_back(GenerateLineRasterIfDef()); |
| |
| // Define a driver varying vec2 "ANGLEPosition". |
| TType *varyingType = new TType(EbtFloat, EbpMedium, qualifier, 4); |
| TVariable *varyingVar = new TVariable(symbolTable, ImmutableString("ANGLEPosition"), |
| varyingType, SymbolType::AngleInternal); |
| TIntermSymbol *varyingDeclarator = new TIntermSymbol(varyingVar); |
| TIntermDeclaration *varyingDecl = new TIntermDeclaration; |
| varyingDecl->appendDeclarator(varyingDeclarator); |
| insertSequence->push_back(varyingDecl); |
| |
| insertSequence->push_back(GenerateEndIf()); |
| |
| // Insert the declarations before Main. |
| size_t mainIndex = FindMainIndex(root); |
| root->insertChildNodes(mainIndex, *insertSequence); |
| |
| return varyingVar; |
| } |
| |
| void AddANGLEPositionVarying(TIntermBlock *root, TSymbolTable *symbolTable) |
| { |
| TVariable *anglePosition = AddANGLEPositionVaryingDeclaration(root, symbolTable, EvqVaryingOut); |
| |
| // Create an assignment "ANGLEPosition = gl_Position". |
| const TVariable *position = BuiltInVariable::gl_Position(); |
| TIntermSymbol *varyingRef = new TIntermSymbol(anglePosition); |
| TIntermBinary *assignment = |
| new TIntermBinary(EOpAssign, varyingRef, new TIntermSymbol(position)); |
| |
| // Ensure the assignment runs at the end of the main() function. |
| TIntermFunctionDefinition *main = FindMain(root); |
| TIntermBlock *mainBody = main->getBody(); |
| mainBody->appendStatement(GenerateLineRasterIfDef()); |
| mainBody->appendStatement(assignment); |
| mainBody->appendStatement(GenerateEndIf()); |
| } |
| |
| void InsertFragCoordCorrection(TIntermBlock *root, |
| TIntermSequence *insertSequence, |
| TSymbolTable *symbolTable, |
| const TVariable *driverUniforms) |
| { |
| TIntermBinary *viewportYScale = CreateDriverUniformRef(driverUniforms, kViewportYScale); |
| TIntermBinary *pivot = CreateDriverUniformRef(driverUniforms, kHalfRenderAreaHeight); |
| FlipBuiltinVariable(root, insertSequence, viewportYScale, symbolTable, |
| BuiltInVariable::gl_FragCoord(), kFlippedFragCoordName, pivot); |
| } |
| |
| // This block adds OpenGL line segment rasterization emulation behind #ifdef guards. |
| // OpenGL's simple rasterization algorithm is a strict subset of the pixels generated by the Vulkan |
| // algorithm. Thus we can implement a shader patch that rejects pixels if they would not be |
| // generated by the OpenGL algorithm. OpenGL's algorithm is similar to Bresenham's line algorithm. |
| // It is implemented for each pixel by testing if the line segment crosses a small diamond inside |
| // the pixel. See the OpenGL ES 2.0 spec section "3.4.1 Basic Line Segment Rasterization". Also |
| // see the Vulkan spec section "24.6.1. Basic Line Segment Rasterization": |
| // https://khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#primsrast-lines-basic |
| // |
| // Using trigonometric math and the fact that we know the size of the diamond we can derive a |
| // formula to test if the line segment crosses the pixel center. gl_FragCoord is used along with an |
| // internal position varying to determine the inputs to the formula. |
| // |
| // The implementation of the test code is similar to the following pseudocode: |
| // |
| // void main() |
| // { |
| // vec2 b = (((position.xy / position.w) * 0.5) + 0.5) * gl_Viewport.zw + gl_Viewport.xy; |
| // vec2 ba = abs(b - gl_FragCoord.xy); |
| // vec2 ba2 = 2.0 * (ba * ba); |
| // vec2 bp = ba2 + ba2.yx - ba; |
| // if (bp.x > epsilon && bp.y > epsilon) |
| // discard; |
| // <otherwise run fragment shader main> |
| // } |
| void AddLineSegmentRasterizationEmulation(TInfoSinkBase &sink, |
| TIntermBlock *root, |
| TSymbolTable *symbolTable, |
| const TVariable *driverUniforms, |
| bool usesFragCoord) |
| { |
| TVariable *anglePosition = AddANGLEPositionVaryingDeclaration(root, symbolTable, EvqVaryingIn); |
| |
| const TType *vec2Type = StaticType::GetBasic<EbtFloat, 2>(); |
| |
| // Create a swizzle to "ANGLEUniforms.viewport.xy". |
| TIntermBinary *viewportRef = CreateDriverUniformRef(driverUniforms, kViewport); |
| TVector<int> swizzleOffsetXY = {0, 1}; |
| TIntermSwizzle *viewportXY = new TIntermSwizzle(viewportRef->deepCopy(), swizzleOffsetXY); |
| |
| // Create a swizzle to "ANGLEUniforms.viewport.zw". |
| TVector<int> swizzleOffsetZW = {2, 3}; |
| TIntermSwizzle *viewportZW = new TIntermSwizzle(viewportRef, swizzleOffsetZW); |
| |
| // ANGLEPosition.xy / ANGLEPosition.w |
| TIntermSymbol *position = new TIntermSymbol(anglePosition); |
| TIntermSwizzle *positionXY = new TIntermSwizzle(position, swizzleOffsetXY); |
| TVector<int> swizzleOffsetW = {3}; |
| TIntermSwizzle *positionW = new TIntermSwizzle(position->deepCopy(), swizzleOffsetW); |
| TIntermBinary *positionNDC = new TIntermBinary(EOpDiv, positionXY, positionW); |
| |
| // ANGLEPosition * 0.5 |
| TIntermConstantUnion *oneHalf = CreateFloatNode(0.5f); |
| TIntermBinary *halfPosition = new TIntermBinary(EOpVectorTimesScalar, positionNDC, oneHalf); |
| |
| // (ANGLEPosition * 0.5) + 0.5 |
| TIntermBinary *offsetHalfPosition = |
| new TIntermBinary(EOpAdd, halfPosition, oneHalf->deepCopy()); |
| |
| // ((ANGLEPosition * 0.5) + 0.5) * ANGLEUniforms.viewport.zw |
| TIntermBinary *scaledPosition = new TIntermBinary(EOpMul, offsetHalfPosition, viewportZW); |
| |
| // ((ANGLEPosition * 0.5) + 0.5) * ANGLEUniforms.viewport + ANGLEUniforms.viewport.xy |
| TIntermBinary *windowPosition = new TIntermBinary(EOpAdd, scaledPosition, viewportXY); |
| |
| // Assign to a temporary "b". |
| TVariable *bTemp = CreateTempVariable(symbolTable, vec2Type); |
| TIntermDeclaration *bDecl = CreateTempInitDeclarationNode(bTemp, windowPosition); |
| |
| // gl_FragCoord.xy |
| const TVariable *fragCoord = BuiltInVariable::gl_FragCoord(); |
| TIntermSymbol *fragCoordRef = new TIntermSymbol(fragCoord); |
| TIntermSwizzle *fragCoordXY = new TIntermSwizzle(fragCoordRef, swizzleOffsetXY); |
| |
| // b - gl_FragCoord.xy |
| TIntermSymbol *bRef = CreateTempSymbolNode(bTemp); |
| TIntermBinary *differenceExpr = new TIntermBinary(EOpSub, bRef, fragCoordXY); |
| |
| // abs(b - gl_FragCoord.xy) |
| TIntermUnary *baAbs = new TIntermUnary(EOpAbs, differenceExpr, nullptr); |
| |
| // Assign to a temporary "ba". |
| TVariable *baTemp = CreateTempVariable(symbolTable, vec2Type); |
| TIntermDeclaration *baDecl = CreateTempInitDeclarationNode(baTemp, baAbs); |
| TIntermSymbol *ba = CreateTempSymbolNode(baTemp); |
| |
| // ba * ba |
| TIntermBinary *baSq = new TIntermBinary(EOpMul, ba, ba->deepCopy()); |
| |
| // 2.0 * ba * ba |
| TIntermTyped *two = CreateFloatNode(2.0f); |
| TIntermBinary *twoBaSq = new TIntermBinary(EOpVectorTimesScalar, baSq, two); |
| |
| // Assign to a temporary "ba2". |
| TVariable *ba2Temp = CreateTempVariable(symbolTable, vec2Type); |
| TIntermDeclaration *ba2Decl = CreateTempInitDeclarationNode(ba2Temp, twoBaSq); |
| |
| // Create a swizzle to "ba2.yx". |
| TVector<int> swizzleOffsetYX = {1, 0}; |
| TIntermSymbol *ba2 = CreateTempSymbolNode(ba2Temp); |
| TIntermSwizzle *ba2YX = new TIntermSwizzle(ba2, swizzleOffsetYX); |
| |
| // ba2 + ba2.yx - ba |
| TIntermBinary *ba2PlusBaYX2 = new TIntermBinary(EOpAdd, ba2->deepCopy(), ba2YX); |
| TIntermBinary *bpInit = new TIntermBinary(EOpSub, ba2PlusBaYX2, ba->deepCopy()); |
| |
| // Assign to a temporary "bp". |
| TVariable *bpTemp = CreateTempVariable(symbolTable, vec2Type); |
| TIntermDeclaration *bpDecl = CreateTempInitDeclarationNode(bpTemp, bpInit); |
| TIntermSymbol *bp = CreateTempSymbolNode(bpTemp); |
| |
| // Create a swizzle to "bp.x". |
| TVector<int> swizzleOffsetX = {0}; |
| TIntermSwizzle *bpX = new TIntermSwizzle(bp, swizzleOffsetX); |
| |
| // Using a small epsilon value ensures that we don't suffer from numerical instability when |
| // lines are exactly vertical or horizontal. |
| static constexpr float kEpisilon = 0.00001f; |
| TIntermConstantUnion *epsilon = CreateFloatNode(kEpisilon); |
| |
| // bp.x > epsilon |
| TIntermBinary *checkX = new TIntermBinary(EOpGreaterThan, bpX, epsilon); |
| |
| // Create a swizzle to "bp.y". |
| TVector<int> swizzleOffsetY = {1}; |
| TIntermSwizzle *bpY = new TIntermSwizzle(bp->deepCopy(), swizzleOffsetY); |
| |
| // bp.y > epsilon |
| TIntermBinary *checkY = new TIntermBinary(EOpGreaterThan, bpY, epsilon->deepCopy()); |
| |
| // (bp.x > epsilon) && (bp.y > epsilon) |
| TIntermBinary *checkXY = new TIntermBinary(EOpLogicalAnd, checkX, checkY); |
| |
| // discard |
| TIntermBranch *discard = new TIntermBranch(EOpKill, nullptr); |
| TIntermBlock *discardBlock = new TIntermBlock; |
| discardBlock->appendStatement(discard); |
| |
| // if ((bp.x > epsilon) && (bp.y > epsilon)) discard; |
| TIntermIfElse *ifStatement = new TIntermIfElse(checkXY, discardBlock, nullptr); |
| |
| // Ensure the line raster code runs at the beginning of main(). |
| TIntermFunctionDefinition *main = FindMain(root); |
| TIntermSequence *mainSequence = main->getBody()->getSequence(); |
| ASSERT(mainSequence); |
| |
| std::array<TIntermNode *, 6> nodes = { |
| {bDecl, baDecl, ba2Decl, bpDecl, ifStatement, GenerateEndIf()}}; |
| mainSequence->insert(mainSequence->begin(), nodes.begin(), nodes.end()); |
| |
| // If the shader does not use frag coord, we should insert it inside the ifdef. |
| if (!usesFragCoord) |
| { |
| InsertFragCoordCorrection(root, mainSequence, symbolTable, driverUniforms); |
| } |
| |
| mainSequence->insert(mainSequence->begin(), GenerateLineRasterIfDef()); |
| } |
| } // anonymous namespace |
| |
| TranslatorVulkan::TranslatorVulkan(sh::GLenum type, ShShaderSpec spec) |
| : TCompiler(type, spec, SH_GLSL_450_CORE_OUTPUT) |
| {} |
| |
| void TranslatorVulkan::translate(TIntermBlock *root, |
| ShCompileOptions compileOptions, |
| PerformanceDiagnostics * /*perfDiagnostics*/) |
| { |
| TInfoSinkBase &sink = getInfoSink().obj; |
| TOutputVulkanGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), |
| getNameMap(), &getSymbolTable(), getShaderType(), |
| getShaderVersion(), getOutputType(), compileOptions); |
| |
| sink << "#version 450 core\n"; |
| |
| // Write out default uniforms into a uniform block assigned to a specific set/binding. |
| int defaultUniformCount = 0; |
| int structTypesUsedForUniforms = 0; |
| int atomicCounterCount = 0; |
| for (const auto &uniform : getUniforms()) |
| { |
| if (!uniform.isBuiltIn() && uniform.staticUse && !gl::IsOpaqueType(uniform.type)) |
| { |
| ++defaultUniformCount; |
| } |
| |
| if (uniform.isStruct()) |
| { |
| ++structTypesUsedForUniforms; |
| } |
| |
| if (gl::IsAtomicCounterType(uniform.type)) |
| { |
| ++atomicCounterCount; |
| } |
| } |
| |
| // TODO(lucferron): Refactor this function to do fewer tree traversals. |
| // http://anglebug.com/2461 |
| if (structTypesUsedForUniforms > 0) |
| { |
| NameEmbeddedStructUniforms(root, &getSymbolTable()); |
| |
| defaultUniformCount -= RewriteStructSamplers(root, &getSymbolTable()); |
| |
| // We must declare the struct types before using them. |
| DeclareStructTypesTraverser structTypesTraverser(&outputGLSL); |
| root->traverse(&structTypesTraverser); |
| structTypesTraverser.updateTree(); |
| } |
| |
| if (defaultUniformCount > 0) |
| { |
| sink << "\n@@ LAYOUT-defaultUniforms(std140) @@ uniform defaultUniforms\n{\n"; |
| |
| DeclareDefaultUniformsTraverser defaultTraverser(&sink, getHashFunction(), &getNameMap()); |
| root->traverse(&defaultTraverser); |
| defaultTraverser.updateTree(); |
| |
| sink << "};\n"; |
| } |
| |
| const TVariable *driverUniforms; |
| if (getShaderType() == GL_COMPUTE_SHADER) |
| { |
| driverUniforms = AddComputeDriverUniformsToShader(root, &getSymbolTable()); |
| } |
| else |
| { |
| driverUniforms = AddGraphicsDriverUniformsToShader(root, &getSymbolTable()); |
| } |
| |
| if (atomicCounterCount > 0) |
| { |
| // ANGLEUniforms.acbBufferOffsets |
| const TIntermBinary *acbBufferOffsets = |
| CreateDriverUniformRef(driverUniforms, kAcbBufferOffsets); |
| |
| RewriteAtomicCounters(root, &getSymbolTable(), acbBufferOffsets); |
| } |
| |
| if (getShaderType() != GL_COMPUTE_SHADER) |
| { |
| ReplaceGLDepthRangeWithDriverUniform(root, driverUniforms, &getSymbolTable()); |
| } |
| |
| // Declare gl_FragColor and glFragData as webgl_FragColor and webgl_FragData |
| // if it's core profile shaders and they are used. |
| if (getShaderType() == GL_FRAGMENT_SHADER) |
| { |
| bool usesPointCoord = false; |
| bool usesFragCoord = false; |
| |
| // Search for the gl_PointCoord usage, if its used, we need to flip the y coordinate. |
| for (const Varying &inputVarying : mInputVaryings) |
| { |
| if (!inputVarying.isBuiltIn()) |
| { |
| continue; |
| } |
| |
| if (inputVarying.name == "gl_PointCoord") |
| { |
| usesPointCoord = true; |
| break; |
| } |
| |
| if (inputVarying.name == "gl_FragCoord") |
| { |
| usesFragCoord = true; |
| break; |
| } |
| } |
| |
| AddLineSegmentRasterizationEmulation(sink, root, &getSymbolTable(), driverUniforms, |
| usesFragCoord); |
| |
| bool hasGLFragColor = false; |
| bool hasGLFragData = false; |
| |
| for (const OutputVariable &outputVar : mOutputVariables) |
| { |
| if (outputVar.name == "gl_FragColor") |
| { |
| ASSERT(!hasGLFragColor); |
| hasGLFragColor = true; |
| continue; |
| } |
| else if (outputVar.name == "gl_FragData") |
| { |
| ASSERT(!hasGLFragData); |
| hasGLFragData = true; |
| continue; |
| } |
| } |
| ASSERT(!(hasGLFragColor && hasGLFragData)); |
| if (hasGLFragColor) |
| { |
| sink << "layout(location = 0) out vec4 webgl_FragColor;\n"; |
| } |
| if (hasGLFragData) |
| { |
| sink << "layout(location = 0) out vec4 webgl_FragData[gl_MaxDrawBuffers];\n"; |
| } |
| |
| if (usesPointCoord) |
| { |
| TIntermBinary *viewportYScale = |
| CreateDriverUniformRef(driverUniforms, kNegViewportYScale); |
| TIntermConstantUnion *pivot = CreateFloatNode(0.5f); |
| FlipBuiltinVariable(root, GetMainSequence(root), viewportYScale, &getSymbolTable(), |
| BuiltInVariable::gl_PointCoord(), kFlippedPointCoordName, pivot); |
| } |
| |
| if (usesFragCoord) |
| { |
| InsertFragCoordCorrection(root, GetMainSequence(root), &getSymbolTable(), |
| driverUniforms); |
| } |
| |
| { |
| TIntermBinary *viewportYScale = CreateDriverUniformRef(driverUniforms, kViewportYScale); |
| RewriteDfdy(root, getSymbolTable(), getShaderVersion(), viewportYScale); |
| } |
| } |
| else if (getShaderType() == GL_VERTEX_SHADER) |
| { |
| AddANGLEPositionVarying(root, &getSymbolTable()); |
| |
| // Add a macro to declare transform feedback buffers. |
| sink << "@@ XFB-DECL @@\n\n"; |
| |
| // Append a macro for transform feedback substitution prior to modifying depth. |
| AppendVertexShaderTransformFeedbackOutputToMain(root, &getSymbolTable()); |
| |
| // Append depth range translation to main. |
| AppendVertexShaderDepthCorrectionToMain(root, &getSymbolTable()); |
| } |
| else |
| { |
| ASSERT(getShaderType() == GL_COMPUTE_SHADER); |
| EmitWorkGroupSizeGLSL(*this, sink); |
| } |
| |
| // Write translated shader. |
| root->traverse(&outputGLSL); |
| } |
| |
| bool TranslatorVulkan::shouldFlattenPragmaStdglInvariantAll() |
| { |
| // Not necessary. |
| return false; |
| } |
| |
| } // namespace sh |
