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//
// Copyright 2018 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.
//
// AtomicCounterFunctionHLSL: Class for writing implementation of atomic counter functions into HLSL
// output.
//
#include "compiler/translator/AtomicCounterFunctionHLSL.h"
#include "compiler/translator/Common.h"
#include "compiler/translator/ImmutableStringBuilder.h"
#include "compiler/translator/InfoSink.h"
#include "compiler/translator/IntermNode.h"
namespace sh
{
namespace
{
constexpr ImmutableString kAtomicCounter("atomicCounter");
constexpr ImmutableString kAtomicCounterIncrement("atomicCounterIncrement");
constexpr ImmutableString kAtomicCounterDecrement("atomicCounterDecrement");
constexpr ImmutableString kAtomicCounterBaseName("_acbase_");
} // namespace
AtomicCounterFunctionHLSL::AtomicCounterFunctionHLSL(bool forceResolution)
: mForceResolution(forceResolution)
{}
ImmutableString AtomicCounterFunctionHLSL::useAtomicCounterFunction(const ImmutableString &name)
{
// The largest string that will be create created is "_acbase_increment" or "_acbase_decrement"
ImmutableStringBuilder hlslFunctionNameSB(kAtomicCounterBaseName.length() +
strlen("increment"));
hlslFunctionNameSB << kAtomicCounterBaseName;
AtomicCounterFunction atomicMethod;
if (kAtomicCounter == name)
{
atomicMethod = AtomicCounterFunction::LOAD;
hlslFunctionNameSB << "load";
}
else if (kAtomicCounterIncrement == name)
{
atomicMethod = AtomicCounterFunction::INCREMENT;
hlslFunctionNameSB << "increment";
}
else if (kAtomicCounterDecrement == name)
{
atomicMethod = AtomicCounterFunction::DECREMENT;
hlslFunctionNameSB << "decrement";
}
else
{
atomicMethod = AtomicCounterFunction::INVALID;
UNREACHABLE();
}
ImmutableString hlslFunctionName(hlslFunctionNameSB);
mAtomicCounterFunctions[hlslFunctionName] = atomicMethod;
return hlslFunctionName;
}
void AtomicCounterFunctionHLSL::atomicCounterFunctionHeader(TInfoSinkBase &out)
{
for (auto &atomicFunction : mAtomicCounterFunctions)
{
out << "uint " << atomicFunction.first
<< "(in RWByteAddressBuffer counter, int address)\n"
"{\n"
" uint ret;\n";
switch (atomicFunction.second)
{
case AtomicCounterFunction::INCREMENT:
out << " counter.InterlockedAdd(address, 1u, ret);\n";
break;
case AtomicCounterFunction::DECREMENT:
out << " counter.InterlockedAdd(address, 0u - 1u, ret);\n"
" ret -= 1u;\n"; // atomicCounterDecrement is a post-decrement op
break;
case AtomicCounterFunction::LOAD:
out << " ret = counter.Load(address);\n";
break;
default:
UNREACHABLE();
break;
}
if (mForceResolution && atomicFunction.second != AtomicCounterFunction::LOAD)
{
out << " if (ret == 0) {\n"
" ret = 0 - ret;\n"
" }\n";
}
out << " return ret;\n"
"}\n\n";
}
}
ImmutableString getAtomicCounterNameForBinding(int binding)
{
std::stringstream counterName = sh::InitializeStream<std::stringstream>();
counterName << kAtomicCounterBaseName << binding;
return ImmutableString(counterName.str());
}
} // namespace sh
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