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//
// Copyright 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.
//
// UseInterfaceBlockFields.cpp: insert statements to reference all members in InterfaceBlock list at
// the beginning of main. This is to work around a Mac driver that treats unused standard/shared
// uniform blocks as inactive.
#include "compiler/translator/UseInterfaceBlockFields.h"
#include "compiler/translator/IntermNode.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/util.h"
namespace sh
{
namespace
{
class UseUniformBlockMembers : public TIntermTraverser
{
public:
UseUniformBlockMembers(const InterfaceBlockList &blocks, const TSymbolTable &symbolTable)
: TIntermTraverser(true, false, false),
mBlocks(blocks),
mSymbolTable(symbolTable),
mCodeInserted(false)
{
ASSERT(mSymbolTable.atGlobalLevel());
}
protected:
bool visitAggregate(Visit visit, TIntermAggregate *node) override { return !mCodeInserted; }
bool visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node) override;
private:
void insertUseCode(TIntermSequence *sequence);
void AddFieldUseStatements(const ShaderVariable &var, TIntermSequence *sequence);
const InterfaceBlockList &mBlocks;
const TSymbolTable &mSymbolTable;
bool mCodeInserted;
};
bool UseUniformBlockMembers::visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node)
{
ASSERT(visit == PreVisit);
if (node->getFunctionSymbolInfo()->isMain())
{
TIntermBlock *body = node->getBody();
ASSERT(body);
insertUseCode(body->getSequence());
mCodeInserted = true;
return false;
}
return !mCodeInserted;
}
void UseUniformBlockMembers::AddFieldUseStatements(const ShaderVariable &var,
TIntermSequence *sequence)
{
TString name = TString(var.name.c_str());
if (var.isArray())
{
size_t pos = name.find_last_of('[');
if (pos != TString::npos)
{
name = name.substr(0, pos);
}
}
const TType *type;
TType basicType;
if (var.isStruct())
{
TVariable *structInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
ASSERT(structInfo);
const TType &structType = structInfo->getType();
type = &structType;
}
else
{
basicType = sh::GetShaderVariableBasicType(var);
type = &basicType;
}
ASSERT(type);
TIntermSymbol *symbol = new TIntermSymbol(0, name, *type);
if (var.isArray())
{
for (unsigned int i = 0; i < var.arraySize; ++i)
{
TIntermBinary *element =
new TIntermBinary(EOpIndexDirect, symbol, TIntermTyped::CreateIndexNode(i));
sequence->insert(sequence->begin(), element);
}
}
else
{
sequence->insert(sequence->begin(), symbol);
}
}
void UseUniformBlockMembers::insertUseCode(TIntermSequence *sequence)
{
for (const auto &block : mBlocks)
{
if (block.instanceName.empty())
{
for (const auto &var : block.fields)
{
AddFieldUseStatements(var, sequence);
}
}
else if (block.arraySize > 0)
{
TString name = TString(block.instanceName.c_str());
TVariable *ubInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
ASSERT(ubInfo);
TIntermSymbol *arraySymbol = new TIntermSymbol(0, name, ubInfo->getType());
for (unsigned int i = 0; i < block.arraySize; ++i)
{
TIntermBinary *instanceSymbol = new TIntermBinary(EOpIndexDirect, arraySymbol,
TIntermTyped::CreateIndexNode(i));
for (unsigned int j = 0; j < block.fields.size(); ++j)
{
TIntermBinary *element =
new TIntermBinary(EOpIndexDirectInterfaceBlock, instanceSymbol,
TIntermTyped::CreateIndexNode(j));
sequence->insert(sequence->begin(), element);
}
}
}
else
{
TString name = TString(block.instanceName.c_str());
TVariable *ubInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
ASSERT(ubInfo);
TIntermSymbol *blockSymbol = new TIntermSymbol(0, name, ubInfo->getType());
for (unsigned int i = 0; i < block.fields.size(); ++i)
{
TIntermBinary *element = new TIntermBinary(
EOpIndexDirectInterfaceBlock, blockSymbol, TIntermTyped::CreateIndexNode(i));
sequence->insert(sequence->begin(), element);
}
}
}
}
} // namespace anonymous
void UseInterfaceBlockFields(TIntermNode *root,
const InterfaceBlockList &blocks,
const TSymbolTable &symbolTable)
{
UseUniformBlockMembers useUniformBlock(blocks, symbolTable);
root->traverse(&useUniformBlock);
}
} // namespace sh
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