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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.
//
// Implementation of texelFetchOffset translation issue workaround.
// See header for more info.
#include "compiler/translator/RewriteTexelFetchOffset.h"
#include "common/angleutils.h"
#include "compiler/translator/IntermNode.h"
#include "compiler/translator/SymbolTable.h"
namespace sh
{
namespace
{
class Traverser : public TIntermTraverser
{
public:
static void Apply(TIntermNode *root,
unsigned int *tempIndex,
const TSymbolTable &symbolTable,
int shaderVersion);
private:
Traverser(const TSymbolTable &symbolTable, int shaderVersion);
bool visitAggregate(Visit visit, TIntermAggregate *node) override;
void nextIteration();
const TSymbolTable *symbolTable;
const int shaderVersion;
bool mFound = false;
};
Traverser::Traverser(const TSymbolTable &symbolTable, int shaderVersion)
: TIntermTraverser(true, false, false), symbolTable(&symbolTable), shaderVersion(shaderVersion)
{
}
// static
void Traverser::Apply(TIntermNode *root,
unsigned int *tempIndex,
const TSymbolTable &symbolTable,
int shaderVersion)
{
Traverser traverser(symbolTable, shaderVersion);
traverser.useTemporaryIndex(tempIndex);
do
{
traverser.nextIteration();
root->traverse(&traverser);
if (traverser.mFound)
{
traverser.updateTree();
}
} while (traverser.mFound);
}
void Traverser::nextIteration()
{
mFound = false;
nextTemporaryIndex();
}
bool Traverser::visitAggregate(Visit visit, TIntermAggregate *node)
{
if (mFound)
{
return false;
}
// Decide if the node represents the call of texelFetchOffset.
if (node->getOp() != EOpFunctionCall || node->isUserDefined())
{
return true;
}
if (node->getName().compare(0, 16, "texelFetchOffset") != 0)
{
return true;
}
// Potential problem case detected, apply workaround.
const TIntermSequence *sequence = node->getSequence();
ASSERT(sequence->size() == 4u);
nextTemporaryIndex();
// Decide if there is a 2DArray sampler.
bool is2DArray = node->getName().find("s2a1") != TString::npos;
// Create new argument list from node->getName().
// e.g. Get "(is2a1;vi3;i1;" from "texelFetchOffset(is2a1;vi3;i1;vi2;"
TString newArgs = node->getName().substr(16, node->getName().length() - 20);
TString newName = "texelFetch" + newArgs;
TSymbol *texelFetchSymbol = symbolTable->findBuiltIn(newName, shaderVersion);
ASSERT(texelFetchSymbol);
int uniqueId = texelFetchSymbol->getUniqueId();
// Create new node that represents the call of function texelFetch.
TIntermAggregate *texelFetchNode = new TIntermAggregate(EOpFunctionCall);
texelFetchNode->setName(newName);
texelFetchNode->setFunctionId(uniqueId);
texelFetchNode->setType(node->getType());
texelFetchNode->setLine(node->getLine());
// Create argument List of texelFetch(sampler, Position+offset, lod).
TIntermSequence newsequence;
// sampler
newsequence.push_back(sequence->at(0));
// Position+offset
TIntermBinary *add = new TIntermBinary(EOpAdd);
add->setType(node->getType());
// Position
TIntermTyped *texCoordNode = sequence->at(1)->getAsTyped();
ASSERT(texCoordNode);
add->setLine(texCoordNode->getLine());
add->setType(texCoordNode->getType());
add->setLeft(texCoordNode);
// offset
ASSERT(sequence->at(3)->getAsTyped());
if (is2DArray)
{
// For 2DArray samplers, Position is ivec3 and offset is ivec2;
// So offset must be converted into an ivec3 before being added to Position.
TIntermAggregate *constructIVec3Node = new TIntermAggregate(EOpConstructIVec3);
constructIVec3Node->setLine(texCoordNode->getLine());
constructIVec3Node->setType(texCoordNode->getType());
TIntermSequence ivec3Sequence;
ivec3Sequence.push_back(sequence->at(3)->getAsTyped());
TConstantUnion *zero = new TConstantUnion();
zero->setIConst(0);
TType *intType = new TType(EbtInt);
TIntermConstantUnion *zeroNode = new TIntermConstantUnion(zero, *intType);
ivec3Sequence.push_back(zeroNode);
constructIVec3Node->insertChildNodes(0, ivec3Sequence);
add->setRight(constructIVec3Node);
}
else
{
add->setRight(sequence->at(3)->getAsTyped());
}
newsequence.push_back(add);
// lod
newsequence.push_back(sequence->at(2));
texelFetchNode->insertChildNodes(0, newsequence);
// Replace the old node by this new node.
queueReplacement(node, texelFetchNode, OriginalNode::IS_DROPPED);
mFound = true;
return false;
}
} // anonymous namespace
void RewriteTexelFetchOffset(TIntermNode *root,
unsigned int *tempIndex,
const TSymbolTable &symbolTable,
int shaderVersion)
{
// texelFetchOffset is only valid in GLSL 3.0 and later.
if (shaderVersion < 300)
return;
Traverser::Apply(root, tempIndex, symbolTable, shaderVersion);
}
} // namespace sh
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