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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"
#include "compiler/translator/ParamType.h"
namespace sh
{
struct MiniFunctionId
{
constexpr MiniFunctionId(TOperator op = EOpNull,
ParamType paramType1 = ParamType::Void,
ParamType paramType2 = ParamType::Void,
ParamType paramType3 = ParamType::Void,
ParamType paramType4 = ParamType::Void)
: op(op),
paramType1(paramType1),
paramType2(paramType2),
paramType3(paramType3),
paramType4(paramType4)
{
}
TOperator op;
ParamType paramType1;
ParamType paramType2;
ParamType paramType3;
ParamType paramType4;
};
class FunctionId final
{
public:
FunctionId();
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);
FunctionId(TOperator op,
const TType *param1,
const TType *param2,
const TType *param3,
const TType *param4);
FunctionId(const FunctionId &) = default;
FunctionId &operator=(const FunctionId &) = default;
bool operator==(const FunctionId &other) const;
bool operator<(const FunctionId &other) const;
FunctionId getCopy() const;
private:
friend bool operator==(const MiniFunctionId &miniId, const FunctionId &functionId);
TOperator mOp;
// The memory that these TType objects use is freed by PoolAllocator. The
// BuiltInFunctionEmulator's lifetime can extend until after the memory pool is freed, but
// that's not an issue since this class never destructs these objects.
const TType *mParam1;
const TType *mParam2;
const TType *mParam3;
const TType *mParam4;
};
inline bool operator==(ParamType paramType, const TType *type)
{
return SameParamType(paramType, type->getBasicType(), type->getNominalSize(),
type->getSecondarySize());
}
inline bool operator==(const MiniFunctionId &miniId, const FunctionId &functionId)
{
return miniId.op == functionId.mOp && miniId.paramType1 == functionId.mParam1 &&
miniId.paramType2 == functionId.mParam2 && miniId.paramType3 == functionId.mParam3 &&
miniId.paramType4 == functionId.mParam4;
}
using BuiltinQueryFunc = const char *(const FunctionId &);
//
// 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" gets written as "name_emu".
static void WriteEmulatedFunctionName(TInfoSinkBase &out, const char *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.
FunctionId addEmulatedFunction(TOperator op,
const TType *param,
const char *emulatedFunctionDefinition);
FunctionId addEmulatedFunction(TOperator op,
const TType *param1,
const TType *param2,
const char *emulatedFunctionDefinition);
FunctionId addEmulatedFunction(TOperator op,
const TType *param1,
const TType *param2,
const TType *param3,
const char *emulatedFunctionDefinition);
FunctionId addEmulatedFunction(TOperator op,
const TType *param1,
const TType *param2,
const TType *param3,
const TType *param4,
const char *emulatedFunctionDefinition);
FunctionId addEmulatedFunctionWithDependency(const FunctionId &dependency,
TOperator op,
const TType *param1,
const TType *param2,
const char *emulatedFunctionDefinition);
FunctionId addEmulatedFunctionWithDependency(const FunctionId &dependency,
TOperator op,
const TType *param1,
const TType *param2,
const TType *param3,
const TType *param4,
const char *emulatedFunctionDefinition);
void addFunctionMap(BuiltinQueryFunc queryFunc);
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 ¶m);
bool setFunctionCalled(TOperator op, const TType ¶m1, const TType ¶m2);
bool setFunctionCalled(TOperator op,
const TType ¶m1,
const TType ¶m2,
const TType ¶m3);
bool setFunctionCalled(TOperator op,
const TType ¶m1,
const TType ¶m2,
const TType ¶m3,
const TType ¶m4);
bool setFunctionCalled(const FunctionId &functionId);
const char *findEmulatedFunction(const FunctionId &functionId) const;
// Map from function id to emulated function definition
std::map<FunctionId, std::string> mEmulatedFunctions;
// Map from dependent functions to their dependencies. This structure allows each function to
// have at most one dependency.
std::map<FunctionId, FunctionId> mFunctionDependencies;
// Called function ids
std::vector<FunctionId> mFunctions;
// Constexpr function tables.
std::vector<BuiltinQueryFunc *> mQueryFunctions;
};
} // namespace sh
#endif // COMPILER_TRANSLATOR_BUILTINFUNCTIONEMULATOR_H_
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