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

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• Hash : 550c600b
  Author :
  Date : 2014-02-26T15:40:48
  

  Improvement on loop unrolling with loops indexing sampler arrays
  
      1) Before this workaround is hardwired on mac, now we move it behind a compil
      2) Fix the issue where "break" inside the loop isn't handled while unrolled.
  
      BUG=338474
      TEST=webgl conformance test sampler-array-using-loop-index.html
  
  Change-Id: I4996a42c2dea39a8a5af772c256f8e3cb383f59a
  Reviewed-on: https://chromium-review.googlesource.com/188079
  Reviewed-by: Zhenyao Mo <zmo@chromium.org>
  Tested-by: Zhenyao Mo <zmo@chromium.org>
  
  Conflicts:
  	include/GLSLANG/ShaderLang.h
  	src/compiler/translator/ValidateLimitations.cpp
  Change-Id: I546197bd7df1634ebccdd380be14c3250cd56151
  Reviewed-on: https://chromium-review.googlesource.com/189061
  Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
  Tested-by: Zhenyao Mo <zmo@chromium.org>
  

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• src/compiler/translator/ForLoopUnroll.h

• //
  // Copyright (c) 2011 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.
  //
  
  #ifndef COMPILER_FORLOOPUNROLL_H_
  #define COMPILER_FORLOOPUNROLL_H_
  
  #include "compiler/translator/LoopInfo.h"
  
  // This class detects for-loops that needs to be unrolled.
  // Currently we support two unroll conditions:
  //   1) kForLoopWithIntegerIndex: unroll if the index type is integer.
  //   2) kForLoopWithSamplerArrayIndex: unroll where a sampler array index
  //      is also the loop integer index, and reject and fail a compile
  //      where a sampler array index is also the loop float index.
  class ForLoopUnrollMarker : public TIntermTraverser
  {
    public:
      enum UnrollCondition
      {
          kIntegerIndex,
          kSamplerArrayIndex
      };
  
      ForLoopUnrollMarker(UnrollCondition condition)
          : mUnrollCondition(condition),
            mSamplerArrayIndexIsFloatLoopIndex(false),
            mVisitSamplerArrayIndexNodeInsideLoop(false)
      {
      }
  
      virtual bool visitBinary(Visit, TIntermBinary *node);
      virtual bool visitLoop(Visit, TIntermLoop *node);
      virtual void visitSymbol(TIntermSymbol *node);
  
      bool samplerArrayIndexIsFloatLoopIndex() const
      {
          return mSamplerArrayIndexIsFloatLoopIndex;
      }
  
    private:
      UnrollCondition mUnrollCondition;
      TLoopStack mLoopStack;
      bool mSamplerArrayIndexIsFloatLoopIndex;
      bool mVisitSamplerArrayIndexNodeInsideLoop;
  };
  
  #endif
  

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