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//
// Copyright (c) 2002-2011 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.
//
#include "angle_gl.h"
#include "compiler/translator/BuiltInFunctionEmulator.h"
#include "compiler/translator/SymbolTable.h"
class BuiltInFunctionEmulator::BuiltInFunctionEmulationMarker : public TIntermTraverser
{
public:
BuiltInFunctionEmulationMarker(BuiltInFunctionEmulator& emulator)
: mEmulator(emulator)
{
}
virtual bool visitUnary(Visit visit, TIntermUnary* node)
{
if (visit == PreVisit) {
bool needToEmulate = mEmulator.SetFunctionCalled(
node->getOp(), node->getOperand()->getType());
if (needToEmulate)
node->setUseEmulatedFunction();
}
return true;
}
virtual bool visitAggregate(Visit visit, TIntermAggregate* node)
{
if (visit == PreVisit) {
// Here we handle all the built-in functions instead of the ones we
// currently identified as problematic.
switch (node->getOp()) {
case EOpLessThan:
case EOpGreaterThan:
case EOpLessThanEqual:
case EOpGreaterThanEqual:
case EOpVectorEqual:
case EOpVectorNotEqual:
case EOpMod:
case EOpPow:
case EOpAtan:
case EOpMin:
case EOpMax:
case EOpClamp:
case EOpMix:
case EOpStep:
case EOpSmoothStep:
case EOpDistance:
case EOpDot:
case EOpCross:
case EOpFaceForward:
case EOpReflect:
case EOpRefract:
case EOpOuterProduct:
case EOpMul:
break;
default:
return true;
};
const TIntermSequence& sequence = *(node->getSequence());
bool needToEmulate = false;
// Right now we only handle built-in functions with two or three parameters.
if (sequence.size() == 2)
{
TIntermTyped* param1 = sequence[0]->getAsTyped();
TIntermTyped* param2 = sequence[1]->getAsTyped();
if (!param1 || !param2)
return true;
needToEmulate = mEmulator.SetFunctionCalled(
node->getOp(), param1->getType(), param2->getType());
}
else if (sequence.size() == 3)
{
TIntermTyped* param1 = sequence[0]->getAsTyped();
TIntermTyped* param2 = sequence[1]->getAsTyped();
TIntermTyped* param3 = sequence[2]->getAsTyped();
if (!param1 || !param2 || !param3)
return true;
needToEmulate = mEmulator.SetFunctionCalled(
node->getOp(), param1->getType(), param2->getType(), param3->getType());
}
else
{
return true;
}
if (needToEmulate)
node->setUseEmulatedFunction();
}
return true;
}
private:
BuiltInFunctionEmulator& mEmulator;
};
BuiltInFunctionEmulator::BuiltInFunctionEmulator()
{}
void BuiltInFunctionEmulator::addEmulatedFunction(
TOperator op, const TType& param,
const char* emulatedFunctionDefinition)
{
mEmulatedFunctions[FunctionId(op, param)] =
std::string(emulatedFunctionDefinition);
}
void BuiltInFunctionEmulator::addEmulatedFunction(
TOperator op, const TType& param1, const TType& param2,
const char* emulatedFunctionDefinition)
{
mEmulatedFunctions[FunctionId(op, param1, param2)] =
std::string(emulatedFunctionDefinition);
}
void BuiltInFunctionEmulator::addEmulatedFunction(
TOperator op, const TType& param1, const TType& param2, const TType& param3,
const char* emulatedFunctionDefinition)
{
mEmulatedFunctions[FunctionId(op, param1, param2, param3)] =
std::string(emulatedFunctionDefinition);
}
bool BuiltInFunctionEmulator::IsOutputEmpty() const
{
return (mFunctions.size() == 0);
}
void BuiltInFunctionEmulator::OutputEmulatedFunctions(
TInfoSinkBase& out) const
{
for (size_t i = 0; i < mFunctions.size(); ++i) {
out << mEmulatedFunctions.find(mFunctions[i])->second << "\n\n";
}
}
bool BuiltInFunctionEmulator::SetFunctionCalled(
TOperator op, const TType& param)
{
return SetFunctionCalled(FunctionId(op, param));
}
bool BuiltInFunctionEmulator::SetFunctionCalled(
TOperator op, const TType& param1, const TType& param2)
{
return SetFunctionCalled(FunctionId(op, param1, param2));
}
bool BuiltInFunctionEmulator::SetFunctionCalled(
TOperator op, const TType& param1, const TType& param2, const TType& param3)
{
return SetFunctionCalled(FunctionId(op, param1, param2, param3));
}
bool BuiltInFunctionEmulator::SetFunctionCalled(
const FunctionId& functionId) {
if (mEmulatedFunctions.find(functionId) != mEmulatedFunctions.end())
{
for (size_t i = 0; i < mFunctions.size(); ++i) {
if (mFunctions[i] == functionId)
return true;
}
mFunctions.push_back(functionId);
return true;
}
return false;
}
void BuiltInFunctionEmulator::MarkBuiltInFunctionsForEmulation(
TIntermNode* root)
{
ASSERT(root);
if (mEmulatedFunctions.empty())
return;
BuiltInFunctionEmulationMarker marker(*this);
root->traverse(&marker);
}
void BuiltInFunctionEmulator::Cleanup()
{
mFunctions.clear();
}
//static
TString BuiltInFunctionEmulator::GetEmulatedFunctionName(
const TString& name)
{
ASSERT(name[name.length() - 1] == '(');
return "webgl_" + name.substr(0, name.length() - 1) + "_emu(";
}
BuiltInFunctionEmulator::FunctionId::FunctionId
(TOperator op, const TType& param)
: mOp(op),
mParam1(param),
mParam2(EbtVoid),
mParam3(EbtVoid)
{
}
BuiltInFunctionEmulator::FunctionId::FunctionId
(TOperator op, const TType& param1, const TType& param2)
: mOp(op),
mParam1(param1),
mParam2(param2),
mParam3(EbtVoid)
{
}
BuiltInFunctionEmulator::FunctionId::FunctionId
(TOperator op, const TType& param1, const TType& param2, const TType& param3)
: mOp(op),
mParam1(param1),
mParam2(param2),
mParam3(param3)
{
}
bool BuiltInFunctionEmulator::FunctionId::operator==
(const BuiltInFunctionEmulator::FunctionId& other) const
{
return (mOp == other.mOp &&
mParam1 == other.mParam1 &&
mParam2 == other.mParam2 &&
mParam3 == other.mParam3);
}
bool BuiltInFunctionEmulator::FunctionId::operator<
(const BuiltInFunctionEmulator::FunctionId& other) const
{
if (mOp != other.mOp)
return mOp < other.mOp;
if (mParam1 != other.mParam1)
return mParam1 < other.mParam1;
if (mParam2 != other.mParam2)
return mParam2 < other.mParam2;
if (mParam3 != other.mParam3)
return mParam3 < other.mParam3;
return false; // all fields are equal
}
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