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

• //
  // Copyright (c) 2002-2014 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_LOOP_INFO_H_
  #define COMPILER_TRANSLATOR_LOOP_INFO_H_
  
  #include "compiler/translator/intermediate.h"
  
  class TLoopIndexInfo
  {
    public:
      TLoopIndexInfo();
  
      // If type is EbtInt, fill all fields of the structure with info
      // extracted from a loop node.
      // If type is not EbtInt, only fill id and type.
      void fillInfo(TIntermLoop *node);
  
      int getId() const { return mId; }
      void setId(int id) { mId = id; }
      TBasicType getType() const { return mType; }
      void setType(TBasicType type) { mType = type; }
      int getCurrentValue() const { return mCurrentValue; }
  
      void step() { mCurrentValue += mIncrementValue; }
  
      // Check if the current value satisfies the loop condition.
      bool satisfiesLoopCondition() const;
  
    private:
      int mId;
      TBasicType mType;  // Either EbtInt or EbtFloat
  
      // Below fields are only valid if the index's type is int.
      int mInitValue;
      int mStopValue;
      int mIncrementValue;
      TOperator mOp;
      int mCurrentValue;
  };
  
  struct TLoopInfo
  {
      TLoopIndexInfo index;
      TIntermLoop *loop;
  
      TLoopInfo();
      TLoopInfo(TIntermLoop *node);
  };
  
  class TLoopStack : public TVector<TLoopInfo>
  {
    public:
      // Search loop stack for a loop whose index matches the input symbol.
      TIntermLoop *findLoop(TIntermSymbol *symbol);
  
      // Find the loop index info in the loop stack by the input symbol.
      TLoopIndexInfo *getIndexInfo(TIntermSymbol *symbol);
  
      // Update the currentValue for the next loop iteration.
      void step();
  
      // Return false if loop condition is no longer satisfied.
      bool satisfiesLoopCondition();
  
      // Check if the symbol is the index of a loop that's unrolled.
      bool needsToReplaceSymbolWithValue(TIntermSymbol *symbol);
  
      // Return the current value of a given loop index symbol.
      int getLoopIndexValue(TIntermSymbol *symbol);
  
      void push(TIntermLoop *info);
      void pop();
  };
  
  #endif // COMPILER_TRANSLATOR_LOOP_INDEX_H_
  
  

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