kc3-lang/angle/src/compiler/translator/NodeSearch.h

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• Hash : fd3b9be6
  Author :
  Date : 2015-05-18T17:07:36
  

  Set mUsesDiscardRewriting more conservatively
  
  This fixes a regression from recent refactoring of unfolding short-circuiting
  operators. mUsesDiscardRewriting used to be set based on detecting patterns
  that the AST traverser now overwrites before the code reaches OutputHLSL. With
  this patch mUsesDiscardRewriting is set more conservatively, which ensures that
  using discard works correctly also in case the input shader contains the same
  kind of pattern as the short-circuiting operator unfolding creates.
  
  TEST=WebGL conformance tests on D3D9
  BUG=chromium:488552
  
  Change-Id: Iea0103822a268079593b0913f0b6fc54c745c6e3
  Reviewed-on: https://chromium-review.googlesource.com/271761
  Reviewed-by: Zhenyao Mo <zmo@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tested-by: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/NodeSearch.h

• //
  // Copyright (c) 2002-2013 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.
  //
  // NodeSearch.h: Utilities for searching translator node graphs
  //
  
  #ifndef COMPILER_TRANSLATOR_NODESEARCH_H_
  #define COMPILER_TRANSLATOR_NODESEARCH_H_
  
  #include "compiler/translator/IntermNode.h"
  
  namespace sh
  {
  
  template <class Parent>
  class NodeSearchTraverser : public TIntermTraverser
  {
    public:
      NodeSearchTraverser()
          : mFound(false)
      {}
  
      bool found() const { return mFound; }
  
      static bool search(TIntermNode *node)
      {
          Parent searchTraverser;
          node->traverse(&searchTraverser);
          return searchTraverser.found();
      }
  
    protected:
      bool mFound;
  };
  
  class FindDiscard : public NodeSearchTraverser<FindDiscard>
  {
    public:
      virtual bool visitBranch(Visit visit, TIntermBranch *node)
      {
          switch (node->getFlowOp())
          {
            case EOpKill:
              mFound = true;
              break;
  
            default: break;
          }
  
          return !mFound;
      }
  };
  
  }
  
  #endif // COMPILER_TRANSLATOR_NODESEARCH_H_
  

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