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//
// Copyright (c) 2002-2013 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/ForLoopUnroll.h"
#include "compiler/translator/ValidateLimitations.h"
#include "angle_gl.h"
bool ForLoopUnrollMarker::visitBinary(Visit, TIntermBinary *node)
{
if (mUnrollCondition != kSamplerArrayIndex)
return true;
// If a sampler array index is also the loop index,
// 1) if the index type is integer, mark the loop for unrolling;
// 2) if the index type if float, set a flag to later fail compile.
switch (node->getOp())
{
case EOpIndexIndirect:
if (node->getLeft() != NULL && node->getRight() != NULL && node->getLeft()->getAsSymbolNode())
{
TIntermSymbol *symbol = node->getLeft()->getAsSymbolNode();
if (IsSampler(symbol->getBasicType()) && symbol->isArray() && !mLoopStack.empty())
{
mVisitSamplerArrayIndexNodeInsideLoop = true;
node->getRight()->traverse(this);
mVisitSamplerArrayIndexNodeInsideLoop = false;
// We have already visited all the children.
return false;
}
}
break;
default:
break;
}
return true;
}
bool ForLoopUnrollMarker::visitLoop(Visit, TIntermLoop *node)
{
bool canBeUnrolled = mHasRunLoopValidation;
if (!mHasRunLoopValidation)
{
canBeUnrolled = ValidateLimitations::IsLimitedForLoop(node);
}
if (mUnrollCondition == kIntegerIndex && canBeUnrolled)
{
// Check if loop index type is integer.
// This is called after ValidateLimitations pass, so the loop has the limited form specified
// in ESSL 1.00 appendix A.
TIntermSequence *declSeq = node->getInit()->getAsAggregate()->getSequence();
TIntermSymbol *symbol = (*declSeq)[0]->getAsBinaryNode()->getLeft()->getAsSymbolNode();
if (symbol->getBasicType() == EbtInt)
node->setUnrollFlag(true);
}
TIntermNode *body = node->getBody();
if (body != nullptr)
{
if (canBeUnrolled)
{
mLoopStack.push(node);
body->traverse(this);
mLoopStack.pop();
}
else
{
body->traverse(this);
}
}
// The loop is fully processed - no need to visit children.
return false;
}
void ForLoopUnrollMarker::visitSymbol(TIntermSymbol* symbol)
{
if (!mVisitSamplerArrayIndexNodeInsideLoop)
return;
TIntermLoop *loop = mLoopStack.findLoop(symbol);
if (loop)
{
switch (symbol->getBasicType())
{
case EbtFloat:
mSamplerArrayIndexIsFloatLoopIndex = true;
break;
case EbtInt:
loop->setUnrollFlag(true);
break;
default:
UNREACHABLE();
}
}
}
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