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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 COMPILER_TRANSLATOR_FORLOOPUNROLL_H_
#define COMPILER_TRANSLATOR_FORLOOPUNROLL_H_
#include "compiler/translator/LoopInfo.h"
namespace sh
{
// 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;
};
} // namespace sh
#endif // COMPILER_TRANSLATOR_FORLOOPUNROLL_H_
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