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//
// Copyright (c) 2002-2014 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.
//
#ifndef COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
#define COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
#include "common/angleutils.h"
#include "compiler/translator/InfoSink.h"
#include "compiler/translator/IntermNode.h"
#include "GLSLANG/ShaderLang.h"
// This class gathers all compound assignments from the AST and can then write
// the functions required for their precision emulation. This way there is no
// need to write a huge number of variations of the emulated compound assignment
// to every translated shader with emulation enabled.
class EmulatePrecision : public TIntermTraverser
{
public:
EmulatePrecision();
virtual void visitSymbol(TIntermSymbol *node);
virtual bool visitBinary(Visit visit, TIntermBinary *node);
virtual bool visitUnary(Visit visit, TIntermUnary *node);
virtual bool visitAggregate(Visit visit, TIntermAggregate *node);
void writeEmulationHelpers(TInfoSinkBase& sink, ShShaderOutput outputLanguage);
private:
struct TypePair
{
TypePair(const char *l, const char *r)
: lType(l), rType(r) { }
const char *lType;
const char *rType;
};
struct TypePairComparator
{
bool operator() (const TypePair& l, const TypePair& r) const
{
if (l.lType == r.lType)
return l.rType < r.rType;
return l.lType < r.lType;
}
};
typedef std::set<TypePair, TypePairComparator> EmulationSet;
EmulationSet mEmulateCompoundAdd;
EmulationSet mEmulateCompoundSub;
EmulationSet mEmulateCompoundMul;
EmulationSet mEmulateCompoundDiv;
// Stack of function call parameter iterators
std::vector<TIntermSequence::const_iterator> mSeqIterStack;
bool mDeclaringVariables;
bool mInLValue;
bool mInFunctionCallOutParameter;
struct TStringComparator
{
bool operator() (const TString& a, const TString& b) const { return a.compare(b) < 0; }
};
// Map from function names to their parameter sequences
std::map<TString, TIntermSequence*, TStringComparator> mFunctionMap;
};
#endif // COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
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