duckstation/dep/glslang/OGLCompilersDLL/InitializeDll.cpp

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//
// Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
//
// Neither the name of 3Dlabs Inc. Ltd. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
#define SH_EXPORTING
#include <cassert>
#include "InitializeDll.h"
#include "../glslang/Include/InitializeGlobals.h"
#include "../glslang/Public/ShaderLang.h"
#include "../glslang/Include/PoolAlloc.h"
namespace glslang {
OS_TLSIndex ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
// Per-process initialization.
// Needs to be called at least once before parsing, etc. is done.
// Will also do thread initialization for the calling thread; other
// threads will need to do that explicitly.
bool InitProcess()
{
glslang::GetGlobalLock();
if (ThreadInitializeIndex != OS_INVALID_TLS_INDEX) {
//
// Function is re-entrant.
//
glslang::ReleaseGlobalLock();
return true;
}
ThreadInitializeIndex = OS_AllocTLSIndex();
if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
assert(0 && "InitProcess(): Failed to allocate TLS area for init flag");
glslang::ReleaseGlobalLock();
return false;
}
if (! InitializePoolIndex()) {
assert(0 && "InitProcess(): Failed to initialize global pool");
glslang::ReleaseGlobalLock();
return false;
}
if (! InitThread()) {
assert(0 && "InitProcess(): Failed to initialize thread");
glslang::ReleaseGlobalLock();
return false;
}
glslang::ReleaseGlobalLock();
return true;
}
// Per-thread scoped initialization.
// Must be called at least once by each new thread sharing the
// symbol tables, etc., needed to parse.
bool InitThread()
{
//
// This function is re-entrant
//
if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
assert(0 && "InitThread(): Process hasn't been initalised.");
return false;
}
if (OS_GetTLSValue(ThreadInitializeIndex) != 0)
return true;
if (! OS_SetTLSValue(ThreadInitializeIndex, (void *)1)) {
assert(0 && "InitThread(): Unable to set init flag.");
return false;
}
glslang::SetThreadPoolAllocator(nullptr);
return true;
}
// Not necessary to call this: InitThread() is reentrant, and the need
// to do per thread tear down has been removed.
//
// This is kept, with memory management removed, to satisfy any exiting
// calls to it that rely on it.
bool DetachThread()
{
bool success = true;
if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
return true;
//
// Function is re-entrant and this thread may not have been initialized.
//
if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {
assert(0 && "DetachThread(): Unable to clear init flag.");
success = false;
}
}
return success;
}
// Not necessary to call this: InitProcess() is reentrant.
//
// This is kept, with memory management removed, to satisfy any exiting
// calls to it that rely on it.
//
// Users of glslang should call shFinalize() or glslang::FinalizeProcess() for
// process-scoped memory tear down.
bool DetachProcess()
{
bool success = true;
if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
return true;
success = DetachThread();
OS_FreeTLSIndex(ThreadInitializeIndex);
ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
DeinitializePoolIndex();
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return success;
}
} // end namespace glslang