OpenAL32/alThunk.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24
  25 #include "alMain.h"
  26 #include "alThunk.h"
  27
  28
  29 static ALboolean  *ThunkArray;
  30 static ALuint      ThunkArraySize;
  31
  32 static CRITICAL_SECTION ThunkLock;
  33
  34 void ThunkInit(void)
  35 {
  36     InitializeCriticalSection(&ThunkLock);
  37     ThunkArraySize = 1;
  38     ThunkArray = calloc(1, ThunkArraySize * sizeof(*ThunkArray));
  39 }
  40
  41 void ThunkExit(void)
  42 {
  43     free(ThunkArray);
  44     ThunkArray = NULL;
  45     ThunkArraySize = 0;
  46     DeleteCriticalSection(&ThunkLock);
  47 }
  48
  49 ALenum NewThunkEntry(ALuint *index)
  50 {
  51     ALuint i;
  52
  53     EnterCriticalSection(&ThunkLock);
  54
  55     for(i = 0;i < ThunkArraySize;i++)
  56     {
  57         if(ThunkArray[i] == AL_FALSE)
  58             break;
  59     }
  60
  61     if(i == ThunkArraySize)
  62     {
  63         ALboolean *NewList;
  64
  65         NewList = realloc(ThunkArray, ThunkArraySize*2 * sizeof(*ThunkArray));
  66         if(!NewList)
  67         {
  68             LeaveCriticalSection(&ThunkLock);
  69             ERR("Realloc failed to increase to %u enties!\n", ThunkArraySize*2);
  70             return AL_OUT_OF_MEMORY;
  71         }
  72         memset(&NewList[ThunkArraySize], 0, ThunkArraySize*sizeof(*ThunkArray));
  73         ThunkArraySize *= 2;
  74         ThunkArray = NewList;
  75     }
  76
  77     ThunkArray[i] = AL_TRUE;
  78     *index = i+1;
  79
  80     LeaveCriticalSection(&ThunkLock);
  81
  82     return AL_NO_ERROR;
  83 }
  84
  85 void FreeThunkEntry(ALuint index)
  86 {
  87     EnterCriticalSection(&ThunkLock);
  88
  89     if(index > 0 && index <= ThunkArraySize)
  90         ThunkArray[index-1] = AL_FALSE;
  91
  92     LeaveCriticalSection(&ThunkLock);
  93 }