kc3-lang/angle/src/compiler/translator/TranslatorHLSL.cpp

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• Hash : b3070102
  Author :
  Date : 2019-10-18T16:01:34
  

  Add SH_REMOVE_DYNAMIC_INDEXING_OF_SWIZZLED_VECTOR
  
  This is a workaround for the webgl2 conformance test case
  WebglConformance_conformance2_glsl3_vector_dynamic_indexing_swizzled_lvalue.
  Dynamic indexing of swizzled lvalue like "v.zyx[i] = 0.0" is problematic on
  various platforms. This removes the indexing by translating it this way:
  
  void dyn_index_write_vec3(inout vec3 base, in int index, in float value){
    switch (index) {
      case (0):
        (base[0] = value);
        return ;
      case (1):
        (base[1] = value);
        return ;
      case (2):
        (base[2] = value);
        return ;
      default:
        break;
    }
    if ((index < 0))
    {
      (base[0] = value);
      return ;
    }
    {
      (base[2] = value);
    }
  }
  
  ...
  dyn_index_write_vec3(v.zyx, i, 0.0);
  ...
  
  Bug: chromium:709351
  Change-Id: I971b38eb404209b56e6764af1063878c078a7e88
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1869109
  Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/TranslatorHLSL.cpp

• //
  // Copyright 2002 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.
  //
  
  #include "compiler/translator/TranslatorHLSL.h"
  
  #include "compiler/translator/OutputHLSL.h"
  #include "compiler/translator/tree_ops/AddDefaultReturnStatements.h"
  #include "compiler/translator/tree_ops/ArrayReturnValueToOutParameter.h"
  #include "compiler/translator/tree_ops/BreakVariableAliasingInInnerLoops.h"
  #include "compiler/translator/tree_ops/EmulatePrecision.h"
  #include "compiler/translator/tree_ops/ExpandIntegerPowExpressions.h"
  #include "compiler/translator/tree_ops/PruneEmptyCases.h"
  #include "compiler/translator/tree_ops/RemoveDynamicIndexing.h"
  #include "compiler/translator/tree_ops/RewriteAtomicFunctionExpressions.h"
  #include "compiler/translator/tree_ops/RewriteElseBlocks.h"
  #include "compiler/translator/tree_ops/RewriteExpressionsWithShaderStorageBlock.h"
  #include "compiler/translator/tree_ops/RewriteTexelFetchOffset.h"
  #include "compiler/translator/tree_ops/RewriteUnaryMinusOperatorInt.h"
  #include "compiler/translator/tree_ops/SeparateArrayConstructorStatements.h"
  #include "compiler/translator/tree_ops/SeparateArrayInitialization.h"
  #include "compiler/translator/tree_ops/SeparateDeclarations.h"
  #include "compiler/translator/tree_ops/SeparateExpressionsReturningArrays.h"
  #include "compiler/translator/tree_ops/SimplifyLoopConditions.h"
  #include "compiler/translator/tree_ops/SplitSequenceOperator.h"
  #include "compiler/translator/tree_ops/UnfoldShortCircuitToIf.h"
  #include "compiler/translator/tree_ops/WrapSwitchStatementsInBlocks.h"
  #include "compiler/translator/tree_util/IntermNodePatternMatcher.h"
  
  namespace sh
  {
  
  TranslatorHLSL::TranslatorHLSL(sh::GLenum type, ShShaderSpec spec, ShShaderOutput output)
      : TCompiler(type, spec, output)
  {}
  
  bool TranslatorHLSL::translate(TIntermBlock *root,
                                 ShCompileOptions compileOptions,
                                 PerformanceDiagnostics *perfDiagnostics)
  {
      const ShBuiltInResources &resources = getResources();
      int numRenderTargets                = resources.EXT_draw_buffers ? resources.MaxDrawBuffers : 1;
      int maxDualSourceDrawBuffers =
          resources.EXT_blend_func_extended ? resources.MaxDualSourceDrawBuffers : 0;
  
      if (!sh::AddDefaultReturnStatements(this, root))
      {
          return false;
      }
  
      // Note that SimplifyLoopConditions needs to be run before any other AST transformations that
      // may need to generate new statements from loop conditions or loop expressions.
      // Note that SeparateDeclarations has already been run in TCompiler::compileTreeImpl().
      if (!SimplifyLoopConditions(
              this, root,
              IntermNodePatternMatcher::kExpressionReturningArray |
                  IntermNodePatternMatcher::kUnfoldedShortCircuitExpression |
                  IntermNodePatternMatcher::kDynamicIndexingOfVectorOrMatrixInLValue,
              &getSymbolTable()))
      {
          return false;
      }
  
      if (!SplitSequenceOperator(
              this, root,
              IntermNodePatternMatcher::kExpressionReturningArray |
                  IntermNodePatternMatcher::kUnfoldedShortCircuitExpression |
                  IntermNodePatternMatcher::kDynamicIndexingOfVectorOrMatrixInLValue,
              &getSymbolTable()))
      {
          return false;
      }
  
      // Note that SeparateDeclarations needs to be run before UnfoldShortCircuitToIf.
      if (!UnfoldShortCircuitToIf(this, root, &getSymbolTable()))
      {
          return false;
      }
  
      if (!SeparateArrayConstructorStatements(this, root))
      {
          return false;
      }
  
      if (!SeparateExpressionsReturningArrays(this, root, &getSymbolTable()))
      {
          return false;
      }
  
      // Note that SeparateDeclarations needs to be run before SeparateArrayInitialization.
      if (!SeparateArrayInitialization(this, root))
      {
          return false;
      }
  
      // HLSL doesn't support arrays as return values, we'll need to make functions that have an array
      // as a return value to use an out parameter to transfer the array data instead.
      if (!ArrayReturnValueToOutParameter(this, root, &getSymbolTable()))
      {
          return false;
      }
  
      if (!shouldRunLoopAndIndexingValidation(compileOptions))
      {
          // HLSL doesn't support dynamic indexing of vectors and matrices.
          if (!RemoveDynamicIndexingOfNonSSBOVectorOrMatrix(this, root, &getSymbolTable(),
                                                            perfDiagnostics))
          {
              return false;
          }
      }
  
      // Work around D3D9 bug that would manifest in vertex shaders with selection blocks which
      // use a vertex attribute as a condition, and some related computation in the else block.
      if (getOutputType() == SH_HLSL_3_0_OUTPUT && getShaderType() == GL_VERTEX_SHADER)
      {
          if (!sh::RewriteElseBlocks(this, root, &getSymbolTable()))
          {
              return false;
          }
      }
  
      // Work around an HLSL compiler frontend aliasing optimization bug.
      // TODO(cwallez) The date is 2016-08-25, Microsoft said the bug would be fixed
      // in the next release of d3dcompiler.dll, it would be nice to detect the DLL
      // version and only apply the workaround if it is too old.
      if (!sh::BreakVariableAliasingInInnerLoops(this, root))
      {
          return false;
      }
  
      // WrapSwitchStatementsInBlocks should be called after any AST transformations that might
      // introduce variable declarations inside the main scope of any switch statement. It cannot
      // result in no-op cases at the end of switch statements, because unreferenced variables
      // have already been pruned.
      if (!WrapSwitchStatementsInBlocks(this, root))
      {
          return false;
      }
  
      bool precisionEmulation =
          getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
  
      if (precisionEmulation)
      {
          EmulatePrecision emulatePrecision(&getSymbolTable());
          root->traverse(&emulatePrecision);
          if (!emulatePrecision.updateTree(this, root))
          {
              return false;
          }
          emulatePrecision.writeEmulationHelpers(getInfoSink().obj, getShaderVersion(),
                                                 getOutputType());
      }
  
      if ((compileOptions & SH_EXPAND_SELECT_HLSL_INTEGER_POW_EXPRESSIONS) != 0)
      {
          if (!sh::ExpandIntegerPowExpressions(this, root, &getSymbolTable()))
          {
              return false;
          }
      }
  
      if ((compileOptions & SH_REWRITE_TEXELFETCHOFFSET_TO_TEXELFETCH) != 0)
      {
          if (!sh::RewriteTexelFetchOffset(this, root, getSymbolTable(), getShaderVersion()))
          {
              return false;
          }
      }
  
      if (((compileOptions & SH_REWRITE_INTEGER_UNARY_MINUS_OPERATOR) != 0) &&
          getShaderType() == GL_VERTEX_SHADER)
      {
          if (!sh::RewriteUnaryMinusOperatorInt(this, root))
          {
              return false;
          }
      }
  
      if (getShaderVersion() >= 310)
      {
          // Due to ssbo also can be used as the argument of atomic memory functions, we should put
          // RewriteExpressionsWithShaderStorageBlock before RewriteAtomicFunctionExpressions.
          if (!sh::RewriteExpressionsWithShaderStorageBlock(this, root, &getSymbolTable()))
          {
              return false;
          }
          if (!sh::RewriteAtomicFunctionExpressions(this, root, &getSymbolTable(),
                                                    getShaderVersion()))
          {
              return false;
          }
      }
  
      sh::OutputHLSL outputHLSL(getShaderType(), getShaderSpec(), getShaderVersion(),
                                getExtensionBehavior(), getSourcePath(), getOutputType(),
                                numRenderTargets, maxDualSourceDrawBuffers, getUniforms(),
                                compileOptions, getComputeShaderLocalSize(), &getSymbolTable(),
                                perfDiagnostics, mShaderStorageBlocks);
  
      outputHLSL.output(root, getInfoSink().obj);
  
      mShaderStorageBlockRegisterMap = outputHLSL.getShaderStorageBlockRegisterMap();
      mUniformBlockRegisterMap       = outputHLSL.getUniformBlockRegisterMap();
      mUniformRegisterMap            = outputHLSL.getUniformRegisterMap();
      mReadonlyImage2DRegisterIndex  = outputHLSL.getReadonlyImage2DRegisterIndex();
      mImage2DRegisterIndex          = outputHLSL.getImage2DRegisterIndex();
      mUsedImage2DFunctionNames      = outputHLSL.getUsedImage2DFunctionNames();
  
      return true;
  }
  
  bool TranslatorHLSL::shouldFlattenPragmaStdglInvariantAll()
  {
      // Not necessary when translating to HLSL.
      return false;
  }
  
  bool TranslatorHLSL::hasShaderStorageBlock(const std::string &uniformBlockName) const
  {
      return (mShaderStorageBlockRegisterMap.count(uniformBlockName) > 0);
  }
  
  unsigned int TranslatorHLSL::getShaderStorageBlockRegister(
      const std::string &shaderStorageBlockName) const
  {
      ASSERT(hasShaderStorageBlock(shaderStorageBlockName));
      return mShaderStorageBlockRegisterMap.find(shaderStorageBlockName)->second;
  }
  
  bool TranslatorHLSL::hasUniformBlock(const std::string &uniformBlockName) const
  {
      return (mUniformBlockRegisterMap.count(uniformBlockName) > 0);
  }
  
  unsigned int TranslatorHLSL::getUniformBlockRegister(const std::string &uniformBlockName) const
  {
      ASSERT(hasUniformBlock(uniformBlockName));
      return mUniformBlockRegisterMap.find(uniformBlockName)->second;
  }
  
  const std::map<std::string, unsigned int> *TranslatorHLSL::getUniformRegisterMap() const
  {
      return &mUniformRegisterMap;
  }
  
  unsigned int TranslatorHLSL::getReadonlyImage2DRegisterIndex() const
  {
      return mReadonlyImage2DRegisterIndex;
  }
  
  unsigned int TranslatorHLSL::getImage2DRegisterIndex() const
  {
      return mImage2DRegisterIndex;
  }
  
  const std::set<std::string> *TranslatorHLSL::getUsedImage2DFunctionNames() const
  {
      return &mUsedImage2DFunctionNames;
  }
  
  }  // namespace sh
  

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