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

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• Hash : ea39a223
  Author :
  Date : 2017-07-06T12:47:59
  

  Simplify queueReplacement AST transform helper
  
  queueReplacement is always called to replace the node that's currently
  being visited in the traverser. The currently visited node can be
  fetched automatically from the traversal path so it can be removed
  from parameters of queueReplacement.
  
  BUG=angleproject:2100
  TEST=angle_unittests
  
  Change-Id: I62ab6d1cd9c0d2b4c260af9f7c85bc156fb3f349
  Reviewed-on: https://chromium-review.googlesource.com/562336
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/RewriteTexelFetchOffset.cpp

• //
  // 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.
  //
  // Implementation of texelFetchOffset translation issue workaround.
  // See header for more info.
  
  #include "compiler/translator/RewriteTexelFetchOffset.h"
  
  #include "common/angleutils.h"
  #include "compiler/translator/IntermTraverse.h"
  #include "compiler/translator/SymbolTable.h"
  
  namespace sh
  {
  
  namespace
  {
  
  class Traverser : public TIntermTraverser
  {
    public:
      static void Apply(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion);
  
    private:
      Traverser(const TSymbolTable &symbolTable, int shaderVersion);
      bool visitAggregate(Visit visit, TIntermAggregate *node) override;
      void nextIteration();
  
      const TSymbolTable *symbolTable;
      const int shaderVersion;
      bool mFound = false;
  };
  
  Traverser::Traverser(const TSymbolTable &symbolTable, int shaderVersion)
      : TIntermTraverser(true, false, false), symbolTable(&symbolTable), shaderVersion(shaderVersion)
  {
  }
  
  // static
  void Traverser::Apply(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion)
  {
      Traverser traverser(symbolTable, shaderVersion);
      do
      {
          traverser.nextIteration();
          root->traverse(&traverser);
          if (traverser.mFound)
          {
              traverser.updateTree();
          }
      } while (traverser.mFound);
  }
  
  void Traverser::nextIteration()
  {
      mFound = false;
  }
  
  bool Traverser::visitAggregate(Visit visit, TIntermAggregate *node)
  {
      if (mFound)
      {
          return false;
      }
  
      // Decide if the node represents the call of texelFetchOffset.
      if (node->getOp() != EOpCallBuiltInFunction)
      {
          return true;
      }
  
      if (node->getFunctionSymbolInfo()->getName() != "texelFetchOffset")
      {
          return true;
      }
  
      // Potential problem case detected, apply workaround.
      const TIntermSequence *sequence = node->getSequence();
      ASSERT(sequence->size() == 4u);
  
      // Decide if the sampler is a 2DArray sampler. In that case position is ivec3 and offset is
      // ivec2.
      bool is2DArray = sequence->at(1)->getAsTyped()->getNominalSize() == 3 &&
                       sequence->at(3)->getAsTyped()->getNominalSize() == 2;
  
      // Create new node that represents the call of function texelFetch.
      // Its argument list will be: texelFetch(sampler, Position+offset, lod).
  
      TIntermSequence *texelFetchArguments = new TIntermSequence();
  
      // sampler
      texelFetchArguments->push_back(sequence->at(0));
  
      // Position
      TIntermTyped *texCoordNode = sequence->at(1)->getAsTyped();
      ASSERT(texCoordNode);
  
      // offset
      TIntermTyped *offsetNode = nullptr;
      ASSERT(sequence->at(3)->getAsTyped());
      if (is2DArray)
      {
          // For 2DArray samplers, Position is ivec3 and offset is ivec2;
          // So offset must be converted into an ivec3 before being added to Position.
          TIntermSequence *constructOffsetIvecArguments = new TIntermSequence();
          constructOffsetIvecArguments->push_back(sequence->at(3)->getAsTyped());
  
          TIntermTyped *zeroNode = TIntermTyped::CreateZero(TType(EbtInt));
          constructOffsetIvecArguments->push_back(zeroNode);
  
          offsetNode = TIntermAggregate::CreateConstructor(texCoordNode->getType(),
                                                           constructOffsetIvecArguments);
          offsetNode->setLine(texCoordNode->getLine());
      }
      else
      {
          offsetNode = sequence->at(3)->getAsTyped();
      }
  
      // Position+offset
      TIntermBinary *add = new TIntermBinary(EOpAdd, texCoordNode, offsetNode);
      add->setLine(texCoordNode->getLine());
      texelFetchArguments->push_back(add);
  
      // lod
      texelFetchArguments->push_back(sequence->at(2));
  
      ASSERT(texelFetchArguments->size() == 3u);
  
      // Get the symbol of the texel fetch function to use.
      TString mangledName = TFunction::GetMangledNameFromCall("texelFetch", *texelFetchArguments);
      TSymbol *texelFetchSymbol = symbolTable->findBuiltIn(mangledName, shaderVersion);
      ASSERT(texelFetchSymbol && texelFetchSymbol->isFunction());
  
      TIntermAggregate *texelFetchNode = TIntermAggregate::CreateBuiltInFunctionCall(
          *static_cast<const TFunction *>(texelFetchSymbol), texelFetchArguments);
      texelFetchNode->setLine(node->getLine());
  
      // Replace the old node by this new node.
      queueReplacement(texelFetchNode, OriginalNode::IS_DROPPED);
      mFound = true;
      return false;
  }
  
  }  // anonymous namespace
  
  void RewriteTexelFetchOffset(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion)
  {
      // texelFetchOffset is only valid in GLSL 3.0 and later.
      if (shaderVersion < 300)
          return;
  
      Traverser::Apply(root, symbolTable, shaderVersion);
  }
  
  }  // namespace sh

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