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//
// Copyright (c) 2016 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.
//
#include "compiler/translator/AddAndTrueToLoopCondition.h"
#include "compiler/translator/IntermTraverse.h"
namespace sh
{
namespace
{
// An AST traverser that rewrites for and while loops by replacing "condition" with
// "condition && true" to work around condition bug on Intel Mac.
class AddAndTrueToLoopConditionTraverser : public TIntermTraverser
{
public:
AddAndTrueToLoopConditionTraverser() : TIntermTraverser(true, false, false) {}
bool visitLoop(Visit, TIntermLoop *loop) override
{
// do-while loop doesn't have this bug.
if (loop->getType() != ELoopFor && loop->getType() != ELoopWhile)
{
return true;
}
// For loop may not have a condition.
if (loop->getCondition() == nullptr)
{
return true;
}
// Constant true.
TConstantUnion *trueConstant = new TConstantUnion();
trueConstant->setBConst(true);
TIntermTyped *trueValue = new TIntermConstantUnion(trueConstant, TType(EbtBool));
// CONDITION && true.
TIntermBinary *andOp = new TIntermBinary(EOpLogicalAnd, loop->getCondition(), trueValue);
loop->setCondition(andOp);
return true;
}
};
} // anonymous namespace
void AddAndTrueToLoopCondition(TIntermNode *root)
{
AddAndTrueToLoopConditionTraverser traverser;
root->traverse(&traverser);
}
} // namespace sh
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