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

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• Hash : af6fc1b4
  Author :
  Date : 2017-01-26T17:45:35
  

  Make aggregate node creation more robust
  
  Now aggregate nodes are always built with their return type, op and
  arguments set. They'll determine their qualifier and precision
  automatically.
  
  This fixes setting of gotPrecisionFromChildren in a few cases.
  
  This will also make it easier to split TIntermAggregate further into
  specialized classes if that is desired.
  
  BUG=angleproject:1490
  TEST=angle_unittests
  
  Change-Id: I1fbe0c75679c517a22d44dfc1ea160ad7a7fdfda
  Reviewed-on: https://chromium-review.googlesource.com/433468
  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/IntermNode.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().compare(0, 16, "texelFetchOffset") != 0)
      {
          return true;
      }
  
      // Potential problem case detected, apply workaround.
      const TIntermSequence *sequence = node->getSequence();
      ASSERT(sequence->size() == 4u);
  
      // Decide if there is a 2DArray sampler.
      bool is2DArray = node->getFunctionSymbolInfo()->getName().find("s2a1") != TString::npos;
  
      // Create new argument list from node->getName().
      // e.g. Get "(is2a1;vi3;i1;" from "texelFetchOffset(is2a1;vi3;i1;vi2;"
      TString newArgs = node->getFunctionSymbolInfo()->getName().substr(
          16, node->getFunctionSymbolInfo()->getName().length() - 20);
      TString newName           = "texelFetch" + newArgs;
      TSymbol *texelFetchSymbol = symbolTable->findBuiltIn(newName, shaderVersion);
      ASSERT(texelFetchSymbol);
      int uniqueId = texelFetchSymbol->getUniqueId();
  
      // 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 = new TIntermAggregate(texCoordNode->getType(), EOpConstructIVec3,
                                            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);
  
      TIntermAggregate *texelFetchNode =
          new TIntermAggregate(node->getType(), EOpCallBuiltInFunction, texelFetchArguments);
      texelFetchNode->getFunctionSymbolInfo()->setName(newName);
      texelFetchNode->getFunctionSymbolInfo()->setId(uniqueId);
      texelFetchNode->setLine(node->getLine());
  
      // Replace the old node by this new node.
      queueReplacement(node, 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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