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

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• Hash : 8a76dcc7
  Author :
  Date : 2015-12-10T20:25:12
  

  Don't try to apply ForLoopUnroll to loops it can't handle
  
  ForLoopUnroll should only mark loops that fit the limitations in ESSL
  1.00 Appendix A.
  
  BUG=angleproject:1253
  TEST=angle_unittests, WebGL conformance tests
  
  Change-Id: I00b0a7d29cd42efea9611d020aa1f873ac04773f
  Reviewed-on: https://chromium-review.googlesource.com/317551
  Tested-by: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-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_TRANSLATOR_FORLOOPUNROLL_H_
  #define COMPILER_TRANSLATOR_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, bool hasRunLoopValidation)
          : TIntermTraverser(true, false, false),
            mUnrollCondition(condition),
            mSamplerArrayIndexIsFloatLoopIndex(false),
            mVisitSamplerArrayIndexNodeInsideLoop(false),
            mHasRunLoopValidation(hasRunLoopValidation)
      {
      }
  
      bool visitBinary(Visit, TIntermBinary *node) override;
      bool visitLoop(Visit, TIntermLoop *node) override;
      void visitSymbol(TIntermSymbol *node) override;
  
      bool samplerArrayIndexIsFloatLoopIndex() const
      {
          return mSamplerArrayIndexIsFloatLoopIndex;
      }
  
    private:
      UnrollCondition mUnrollCondition;
      TLoopStack mLoopStack;
      bool mSamplerArrayIndexIsFloatLoopIndex;
      bool mVisitSamplerArrayIndexNodeInsideLoop;
      bool mHasRunLoopValidation;
  };
  
  #endif // COMPILER_TRANSLATOR_FORLOOPUNROLL_H_
  

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