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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/InitializeVariables.h"
#include "angle_gl.h"
#include "common/debug.h"
#include "compiler/translator/IntermNode.h"
#include "compiler/translator/util.h"
namespace
{
TIntermConstantUnion *constructConstUnionNode(const TType &type)
{
TType myType = type;
myType.clearArrayness();
myType.setQualifier(EvqConst);
size_t size = myType.getObjectSize();
TConstantUnion *u = new TConstantUnion[size];
for (size_t ii = 0; ii < size; ++ii)
{
switch (type.getBasicType())
{
case EbtFloat:
u[ii].setFConst(0.0f);
break;
case EbtInt:
u[ii].setIConst(0);
break;
case EbtUInt:
u[ii].setUConst(0u);
break;
default:
UNREACHABLE();
return nullptr;
}
}
TIntermConstantUnion *node = new TIntermConstantUnion(u, myType);
return node;
}
TIntermConstantUnion *constructIndexNode(int index)
{
TConstantUnion *u = new TConstantUnion[1];
u[0].setIConst(index);
TType type(EbtInt, EbpUndefined, EvqConst, 1);
TIntermConstantUnion *node = new TIntermConstantUnion(u, type);
return node;
}
class VariableInitializer : public TIntermTraverser
{
public:
VariableInitializer(const InitVariableList &vars)
: TIntermTraverser(true, false, false), mVariables(vars), mCodeInserted(false)
{
}
protected:
bool visitBinary(Visit, TIntermBinary *node) override { return false; }
bool visitUnary(Visit, TIntermUnary *node) override { return false; }
bool visitSelection(Visit, TIntermSelection *node) override { return false; }
bool visitLoop(Visit, TIntermLoop *node) override { return false; }
bool visitBranch(Visit, TIntermBranch *node) override { return false; }
bool visitAggregate(Visit visit, TIntermAggregate *node) override;
private:
void insertInitCode(TIntermSequence *sequence);
const InitVariableList &mVariables;
bool mCodeInserted;
};
// VariableInitializer implementation.
bool VariableInitializer::visitAggregate(Visit visit, TIntermAggregate *node)
{
bool visitChildren = !mCodeInserted;
switch (node->getOp())
{
case EOpSequence:
break;
case EOpFunction:
{
// Function definition.
ASSERT(visit == PreVisit);
if (node->getName() == "main(")
{
TIntermSequence *sequence = node->getSequence();
ASSERT((sequence->size() == 1) || (sequence->size() == 2));
TIntermAggregate *body = NULL;
if (sequence->size() == 1)
{
body = new TIntermAggregate(EOpSequence);
sequence->push_back(body);
}
else
{
body = (*sequence)[1]->getAsAggregate();
}
ASSERT(body);
insertInitCode(body->getSequence());
mCodeInserted = true;
}
break;
}
default:
visitChildren = false;
break;
}
return visitChildren;
}
void VariableInitializer::insertInitCode(TIntermSequence *sequence)
{
for (size_t ii = 0; ii < mVariables.size(); ++ii)
{
const sh::ShaderVariable &var = mVariables[ii];
TString name = TString(var.name.c_str());
if (var.isArray())
{
TType type = sh::ConvertShaderVariableTypeToTType(var.type);
size_t pos = name.find_last_of('[');
if (pos != TString::npos)
name = name.substr(0, pos);
for (int index = static_cast<int>(var.arraySize) - 1; index >= 0; --index)
{
TIntermBinary *assign = new TIntermBinary(EOpAssign);
sequence->insert(sequence->begin(), assign);
TIntermBinary *indexDirect = new TIntermBinary(EOpIndexDirect);
TIntermSymbol *symbol = new TIntermSymbol(0, name, type);
indexDirect->setLeft(symbol);
TIntermConstantUnion *indexNode = constructIndexNode(index);
indexDirect->setRight(indexNode);
assign->setLeft(indexDirect);
TIntermConstantUnion *zeroConst = constructConstUnionNode(type);
assign->setRight(zeroConst);
}
}
else if (var.isStruct())
{
TFieldList *fields = new TFieldList;
TSourceLoc loc;
for (auto field : var.fields)
{
fields->push_back(new TField(nullptr, new TString(field.name.c_str()), loc));
}
TStructure *structure = new TStructure(new TString(var.structName.c_str()), fields);
TType type;
type.setStruct(structure);
for (int fieldIndex = 0; fieldIndex < static_cast<int>(var.fields.size()); ++fieldIndex)
{
TIntermBinary *assign = new TIntermBinary(EOpAssign);
sequence->insert(sequence->begin(), assign);
TIntermBinary *indexDirectStruct = new TIntermBinary(EOpIndexDirectStruct);
TIntermSymbol *symbol = new TIntermSymbol(0, name, type);
indexDirectStruct->setLeft(symbol);
TIntermConstantUnion *indexNode = constructIndexNode(fieldIndex);
indexDirectStruct->setRight(indexNode);
assign->setLeft(indexDirectStruct);
const sh::ShaderVariable &field = var.fields[fieldIndex];
TType fieldType = sh::ConvertShaderVariableTypeToTType(field.type);
TIntermConstantUnion *zeroConst = constructConstUnionNode(fieldType);
assign->setRight(zeroConst);
}
}
else
{
TType type = sh::ConvertShaderVariableTypeToTType(var.type);
TIntermBinary *assign = new TIntermBinary(EOpAssign);
sequence->insert(sequence->begin(), assign);
TIntermSymbol *symbol = new TIntermSymbol(0, name, type);
assign->setLeft(symbol);
TIntermConstantUnion *zeroConst = constructConstUnionNode(type);
assign->setRight(zeroConst);
}
}
}
} // namespace anonymous
void InitializeVariables(TIntermNode *root, const InitVariableList &vars)
{
VariableInitializer initializer(vars);
root->traverse(&initializer);
}
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