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

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• Hash : 89dd8f37
  Author :
  Date : 2016-11-09T12:59:30
  

  Remove invariant declaration in vertex shader for translation from ESSL 3.00 to GLSL <= 4.1
  
  This is a follow-up patch of
  https://chromium-review.googlesource.com/408569. This CL removes
  invariant declaration in ESSL 3.00 vertex shader, such like:
  "
  out vec4 foo;
  invariant foo;
  "
  
  This CL also adds the workarounds in libANGLE.
  
  BUG=chromium:639760
  TEST=webgl2_conformance
  
  Change-Id: I568ab51a9a2f5da10d1aff0b63aae8805097e081
  Reviewed-on: https://chromium-review.googlesource.com/409157
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/RemoveInvariantDeclaration.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.
  //
  
  #include "compiler/translator/RemoveInvariantDeclaration.h"
  
  #include "compiler/translator/IntermNode.h"
  
  namespace sh
  {
  
  namespace
  {
  
  // An AST traverser that removes invariant declaration for input in fragment shader
  // when GLSL >= 4.20 and for output in vertex shader when GLSL < 4.2.
  class RemoveInvariantDeclarationTraverser : public TIntermTraverser
  {
    public:
      RemoveInvariantDeclarationTraverser() : TIntermTraverser(true, false, false) {}
  
    private:
      bool visitAggregate(Visit visit, TIntermAggregate *node) override
      {
          if (node->getOp() == EOpInvariantDeclaration)
          {
              TIntermSequence emptyReplacement;
              mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(),
                                                                        node, emptyReplacement));
              return false;
          }
          return true;
      }
  };
  
  }  // anonymous namespace
  
  void RemoveInvariantDeclaration(TIntermNode *root)
  {
      RemoveInvariantDeclarationTraverser traverser;
      root->traverse(&traverser);
      traverser.updateTree();
  }
  
  }  // namespace sh
  

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