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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 "GLSLANG/ShaderLang.h"
#include "common/angleutils.h"
#include "compiler/translator/Compiler.h"
#include "compiler/translator/InfoSink.h"
#include "compiler/translator/IntermTraverse.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.
namespace sh
{
class EmulatePrecision : public TLValueTrackingTraverser
{
public:
EmulatePrecision(TSymbolTable *symbolTable, int shaderVersion);
void visitSymbol(TIntermSymbol *node) override;
bool visitBinary(Visit visit, TIntermBinary *node) override;
bool visitUnary(Visit visit, TIntermUnary *node) override;
bool visitAggregate(Visit visit, TIntermAggregate *node) override;
bool visitInvariantDeclaration(Visit visit, TIntermInvariantDeclaration *node) override;
bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
bool visitFunctionPrototype(Visit visit, TIntermFunctionPrototype *node) override;
void writeEmulationHelpers(TInfoSinkBase &sink,
const int shaderVersion,
const ShShaderOutput outputLanguage);
static bool SupportedInLanguage(const 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;
bool mDeclaringVariables;
};
} // namespace sh
#endif // COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
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