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//
// Copyright (c) 2011 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_BUILTINFUNCTIONEMULATOR_H_
#define COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_
#include "compiler/translator/InfoSink.h"
#include "compiler/translator/IntermNode.h"
//
// This class decides which built-in functions need to be replaced with the
// emulated ones.
// It can be used to work around driver bugs or implement functions that are
// not natively implemented on a specific platform.
//
class BuiltInFunctionEmulator
{
public:
BuiltInFunctionEmulator();
void MarkBuiltInFunctionsForEmulation(TIntermNode* root);
void Cleanup();
// "name(" becomes "webgl_name_emu(".
static TString GetEmulatedFunctionName(const TString& name);
bool IsOutputEmpty() const;
// Output function emulation definition. This should be before any other
// shader source.
void OutputEmulatedFunctions(TInfoSinkBase& out) const;
// Add functions that need to be emulated.
void addEmulatedFunction(TOperator op, const TType& param, const char* emulatedFunctionDefinition);
void addEmulatedFunction(TOperator op, const TType& param1, const TType& param2, const char* emulatedFunctionDefinition);
void addEmulatedFunction(TOperator op, const TType& param1, const TType& param2, const TType& param3, const char* emulatedFunctionDefinition);
private:
class BuiltInFunctionEmulationMarker;
// Records that a function is called by the shader and might need to be
// emulated. If the function is not in mEmulatedFunctions, this becomes a
// no-op. Returns true if the function call needs to be replaced with an
// emulated one.
bool SetFunctionCalled(TOperator op, const TType& param);
bool SetFunctionCalled(
TOperator op, const TType& param1, const TType& param2);
bool SetFunctionCalled(
TOperator op, const TType& param1, const TType& param2, const TType& param3);
class FunctionId {
public:
FunctionId(TOperator op, const TType& param);
FunctionId(TOperator op, const TType& param1, const TType& param2);
FunctionId(TOperator op, const TType& param1, const TType& param2, const TType& param3);
bool operator==(const FunctionId& other) const;
bool operator<(const FunctionId& other) const;
private:
TOperator mOp;
TType mParam1;
TType mParam2;
TType mParam3;
};
bool SetFunctionCalled(const FunctionId& functionId);
// Map from function id to emulated function definition
std::map<FunctionId, std::string> mEmulatedFunctions;
// Called function ids
std::vector<FunctionId> mFunctions;
};
#endif // COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_
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