/**
 * OpenAL cross platform audio library
 * Copyright (C) 1999-2007 by authors.
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA  02111-1307, USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include <stdlib.h>

#include "alMain.h"
#include "alThunk.h"


static ALenum *ThunkArray;
static ALuint  ThunkArraySize;
static RWLock  ThunkLock;

void ThunkInit(void)
{
    RWLockInit(&ThunkLock);
    ThunkArraySize = 1;
    ThunkArray = calloc(1, ThunkArraySize * sizeof(*ThunkArray));
}

void ThunkExit(void)
{
    free(ThunkArray);
    ThunkArray = NULL;
    ThunkArraySize = 0;
}

ALenum NewThunkEntry(ALuint *index)
{
    ALenum *NewList;
    ALuint i;

    ReadLock(&ThunkLock);
    for(i = 0;i < ThunkArraySize;i++)
    {
        if(ExchangeInt(&ThunkArray[i], AL_TRUE) == AL_FALSE)
        {
            ReadUnlock(&ThunkLock);
            *index = i+1;
            return AL_NO_ERROR;
        }
    }
    ReadUnlock(&ThunkLock);

    WriteLock(&ThunkLock);
    NewList = realloc(ThunkArray, ThunkArraySize*2 * sizeof(*ThunkArray));
    if(!NewList)
    {
        WriteUnlock(&ThunkLock);
        ERR("Realloc failed to increase to %u entries!\n", ThunkArraySize*2);
        return AL_OUT_OF_MEMORY;
    }
    memset(&NewList[ThunkArraySize], 0, ThunkArraySize*sizeof(*ThunkArray));
    ThunkArraySize *= 2;
    ThunkArray = NewList;

    ThunkArray[i] = AL_TRUE;
    WriteUnlock(&ThunkLock);

    *index = i+1;
    return AL_NO_ERROR;
}

void FreeThunkEntry(ALuint index)
{
    ReadLock(&ThunkLock);
    if(index > 0 && index <= ThunkArraySize)
        ExchangeInt(&ThunkArray[index-1], AL_FALSE);
    ReadUnlock(&ThunkLock);
}