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//
// Copyright 2002 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 "compiler/translator/BuiltInFunctionEmulator.h"
#include "angle_gl.h"
#include "compiler/translator/Symbol.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
namespace sh
{
class BuiltInFunctionEmulator::BuiltInFunctionEmulationMarker : public TIntermTraverser
{
public:
BuiltInFunctionEmulationMarker(BuiltInFunctionEmulator &emulator)
: TIntermTraverser(true, false, false), mEmulator(emulator)
{}
bool visitUnary(Visit visit, TIntermUnary *node) override
{
if (node->getFunction())
{
bool needToEmulate = mEmulator.setFunctionCalled(node->getFunction());
if (needToEmulate)
node->setUseEmulatedFunction();
}
return true;
}
bool visitAggregate(Visit visit, TIntermAggregate *node) override
{
// Here we handle all the math built-in functions, not just the ones that are currently
// identified as problematic.
if (!BuiltInGroup::IsMath(node->getOp()))
{
return true;
}
bool needToEmulate = mEmulator.setFunctionCalled(node->getFunction());
if (needToEmulate)
node->setUseEmulatedFunction();
return true;
}
private:
BuiltInFunctionEmulator &mEmulator;
};
BuiltInFunctionEmulator::BuiltInFunctionEmulator() {}
void BuiltInFunctionEmulator::addEmulatedFunction(const TSymbolUniqueId &uniqueId,
const char *emulatedFunctionDefinition)
{
mEmulatedFunctions[uniqueId.get()] = std::string(emulatedFunctionDefinition);
}
void BuiltInFunctionEmulator::addEmulatedFunctionWithDependency(
const TSymbolUniqueId &dependency,
const TSymbolUniqueId &uniqueId,
const char *emulatedFunctionDefinition)
{
mEmulatedFunctions[uniqueId.get()] = std::string(emulatedFunctionDefinition);
mFunctionDependencies[uniqueId.get()] = dependency.get();
}
bool BuiltInFunctionEmulator::isOutputEmpty() const
{
return (mFunctions.size() == 0);
}
void BuiltInFunctionEmulator::outputEmulatedFunctions(TInfoSinkBase &out) const
{
for (const auto &function : mFunctions)
{
const char *body = findEmulatedFunction(function);
ASSERT(body);
out << body;
out << "\n\n";
}
}
const char *BuiltInFunctionEmulator::findEmulatedFunction(int uniqueId) const
{
for (const auto &queryFunction : mQueryFunctions)
{
const char *result = queryFunction(uniqueId);
if (result)
{
return result;
}
}
const auto &result = mEmulatedFunctions.find(uniqueId);
if (result != mEmulatedFunctions.end())
{
return result->second.c_str();
}
return nullptr;
}
bool BuiltInFunctionEmulator::setFunctionCalled(const TFunction *function)
{
ASSERT(function != nullptr);
return setFunctionCalled(function->uniqueId().get());
}
bool BuiltInFunctionEmulator::setFunctionCalled(int uniqueId)
{
if (!findEmulatedFunction(uniqueId))
{
return false;
}
for (size_t i = 0; i < mFunctions.size(); ++i)
{
if (mFunctions[i] == uniqueId)
return true;
}
// If the function depends on another, mark the dependency as called.
auto dependency = mFunctionDependencies.find(uniqueId);
if (dependency != mFunctionDependencies.end())
{
setFunctionCalled((*dependency).second);
}
mFunctions.push_back(uniqueId);
return true;
}
void BuiltInFunctionEmulator::markBuiltInFunctionsForEmulation(TIntermNode *root)
{
ASSERT(root);
if (mEmulatedFunctions.empty() && mQueryFunctions.empty())
return;
BuiltInFunctionEmulationMarker marker(*this);
root->traverse(&marker);
}
void BuiltInFunctionEmulator::cleanup()
{
mFunctions.clear();
mFunctionDependencies.clear();
}
void BuiltInFunctionEmulator::addFunctionMap(BuiltinQueryFunc queryFunc)
{
mQueryFunctions.push_back(queryFunc);
}
// static
void BuiltInFunctionEmulator::WriteEmulatedFunctionName(TInfoSinkBase &out, const char *name)
{
ASSERT(name[strlen(name) - 1] != '(');
out << name << "_emu";
}
} // namespace sh
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