//
//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 <assert.h>

#include "InitializeDll.h"
#include "Include/InitializeGlobals.h"

#include "Public/ShaderLang.h"

namespace glslang {

OS_TLSIndex ThreadInitializeIndex = OS_INVALID_TLS_INDEX;

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;
	}

	InitThread();

    glslang::ReleaseGlobalLock();
    return true;
}


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;

	InitializeMemoryPools();

    if (! OS_SetTLSValue(ThreadInitializeIndex, (void *)1)) {
		assert(0 && "InitThread(): Unable to set init flag.");
        return false;
	}

    return true;
}


bool DetachThread()
{
    bool success = true;

    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
        return true;

	//
	// Function is re-entrant and this thread may not have been initalised.
	//
    if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
        if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {
			assert(0 && "DetachThread(): Unable to clear init flag.");
            success = false;
		}

		FreeGlobalPools();

	}

    return success;
}

bool DetachProcess()
{
    bool success = true;

    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
        return true;

    ShFinalize();

    success = DetachThread();

	FreePoolIndex();

    OS_FreeTLSIndex(ThreadInitializeIndex);
    ThreadInitializeIndex = OS_INVALID_TLS_INDEX;

    return success;
}

} // end namespace glslang