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 //

 // 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 ForLoopUnroll_h

 #define ForLoopUnroll_h

 #include "compiler/intermediate.h"

 struct TLoopIndexInfo {

     int id;

     int initValue;

     int stopValue;

     int incrementValue;

     TOperator op;

     int currentValue;

 };

 class ForLoopUnroll {

 public:

     ForLoopUnroll() { }

     void FillLoopIndexInfo(TIntermLoop* node, TLoopIndexInfo& info);

     // Update the info.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(TLoopIndexInfo& info);

     void Pop();

     static void MarkForLoopsWithIntegerIndicesForUnrolling(TIntermNode* root);

 private:

     int getLoopIncrement(TIntermLoop* node);

     int evaluateIntConstant(TIntermConstantUnion* node);

     TVector<TLoopIndexInfo> mLoopIndexStack;

 };

 #endif