misc/openalbridge/openalbridge.c
author nemo
Thu, 06 May 2010 02:00:39 +0000
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permissions -rw-r--r--
Cheating
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/*
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* OpenAL Bridge - a simple portable library for OpenAL interface
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* Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "openalbridge.h"
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#include "globals.h"
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#include "al.h"
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#include "alc.h"
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#include "wrappers.h"
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#include "loaders.h"
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/*Sources are points emitting sound*/
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ALuint *Sources;
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/*Buffers hold sound data*/
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ALuint *Buffers;
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/*index for Sources and Buffers*/
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ALuint globalindex, globalsize, increment;
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ALboolean isBridgeReady = AL_FALSE;
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ALfloat old_gain;
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int openal_init (int memorysize) {
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    /*Initialize an OpenAL contex and allocate memory space for data and buffers*/
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    ALCcontext *context;
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    ALCdevice *device;
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    // set the memory dimentsion and the increment width when reallocating
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    if (memorysize <= 0)
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        globalsize = 50;
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    else
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        globalsize = memorysize;
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    increment = globalsize;
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    // reuse old context but keep the new value for increment
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    if (isBridgeReady == AL_TRUE) {
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        fprintf(stderr,"(Bridge Warning) - already initialized");
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        return 0;
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    }
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    // open hardware device if present
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    device = alcOpenDevice(NULL);
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    if (device == NULL) {
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        fprintf(stderr,"(Bridge Warning) - failed to open sound device, using software renderer");
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        device = alcOpenDevice("Generic Software");
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        if (device == NULL) {
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            fprintf(stderr,"(Bridge Error) - failed to open sound software device, sound will be disabled");
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            return -1;
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        }
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    }
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    fprintf(stderr,"(Bridge Info) - Output device: %s", alcGetString(device, ALC_DEVICE_SPECIFIER));
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    context = alcCreateContext(device, NULL);
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    alcMakeContextCurrent(context);
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    alcProcessContext(context);
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    if (AL_NO_ERROR != alGetError()) {
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        fprintf(stderr,"(Bridge Error) - Failed to create a new contex");
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        alcMakeContextCurrent(NULL);
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        alcDestroyContext(context);
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        alcCloseDevice(device);
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        return -2;
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    }
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    // allocate memory space for buffers and sources
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    Buffers = (ALuint*) Malloc(sizeof(ALuint)*globalsize);
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    Sources = (ALuint*) Malloc(sizeof(ALuint)*globalsize);
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    // set the listener gain, position (on xyz axes), velocity (one value for each axe) and orientation
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    // Position, Velocity and Orientation of the listener
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    ALfloat ListenerPos[] = {0.0, 0.0, 0.0};
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    ALfloat ListenerVel[] = {0.0, 0.0, 0.0};
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    ALfloat ListenerOri[] = {0.0, 0.0, -1.0,  0.0, 1.0, 0.0};
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    alListenerf (AL_GAIN,        1.0f       );
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    alListenerfv(AL_POSITION,    ListenerPos);
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    alListenerfv(AL_VELOCITY,    ListenerVel);
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    alListenerfv(AL_ORIENTATION, ListenerOri);
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    if (AL_NO_ERROR != alGetError()) {
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        fprintf(stderr,"(Bridge Error) - Failed to set Listener properties");
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        return -3;
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    }
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    isBridgeReady = AL_TRUE;
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    alGetError();  // clear any AL errors beforehand
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    return AL_TRUE;
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}
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void openal_close (void) {
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    /*Stop all sounds, deallocate all memory and close OpenAL */
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    ALCcontext *context;
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    ALCdevice  *device;
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    if (isBridgeReady == AL_FALSE) {
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        fprintf(stderr,"(Bridge Warning) - OpenAL not initialized");
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        return;
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    }
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    alSourceStopv	(globalsize, Sources);
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    alDeleteSources (globalsize, Sources);
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    alDeleteBuffers (globalsize, Buffers);
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    free(Sources);
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    free(Buffers);
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    context = alcGetCurrentContext();
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    device  = alcGetContextsDevice(context);
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    alcMakeContextCurrent(NULL);
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    alcDestroyContext(context);
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    alcCloseDevice(device);
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    isBridgeReady = AL_FALSE;
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    fprintf(stderr,"(Bridge Info) - closed");
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    return;
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}
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ALboolean openal_ready (void) {
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    return isBridgeReady;
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}
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void helper_realloc (void) {
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    /*expands allocated memory when loading more sound files than expected*/
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    int oldsize = globalsize;
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    globalsize += increment;
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    fprintf(stderr,"(Bridge Info) - Realloc in process from %d to %d\n", oldsize, globalsize);
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   148
    
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    Buffers = (ALuint*) Realloc(Buffers, sizeof(ALuint)*globalsize);
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    Sources = (ALuint*) Realloc(Sources, sizeof(ALuint)*globalsize);
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   151
    
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    return;
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}
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   154
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   155
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   156
int openal_loadfile (const char *filename){
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    /*Open a file, load into memory and allocate the Source buffer for playing*/
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    ALfloat SourcePos[] = { 0.0, 0.0, 0.0 }; /*Position of the source sound*/
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    ALfloat SourceVel[] = { 0.0, 0.0, 0.0 }; /*Velocity of the source sound*/
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    ALenum format;
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   161
    ALsizei bitsize, freq;
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   162
    char *data;
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   163
    uint32_t fileformat;
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   164
    ALenum error;
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   165
    FILE *fp;
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   167
    if (isBridgeReady == AL_FALSE) {
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        fprintf(stderr,"(Bridge Warning) - not initialized");
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   169
        return -1;
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   170
    }
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   171
    
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    /*when the buffers are all used, we can expand memory to accept new files*/
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   173
    if (globalindex == globalsize)
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   174
        helper_realloc();
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   175
    
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    /*detect the file format, as written in the first 4 bytes of the header*/
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   177
    fp = Fopen (filename, "rb");
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   178
    
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   179
    if (fp == NULL)
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   180
        return -2;
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   181
    
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    error = fread (&fileformat, sizeof(uint32_t), 1, fp);
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   183
    fclose (fp);
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   184
    
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   185
    if (error < 0) {
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   186
        fprintf(stderr,"(Bridge Error) - File %s is too short", filename);
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   187
        return -3;
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   188
    }
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   189
    
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    /*prepare the buffer to receive data*/
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   191
    alGenBuffers(1, &Buffers[globalindex]);
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   192
    
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   193
    if (AL_NO_ERROR != alGetError()) {
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        fprintf(stderr,"(Bridge Error) - Failed to allocate memory for buffers");
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   195
        return -4;
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   196
    }
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diff changeset
   197
    
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   198
    /*prepare the source to emit sound*/
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   199
    alGenSources(1, &Sources[globalindex]);
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   200
    
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   201
    if (AL_NO_ERROR != alGetError()) {
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   202
        fprintf(stderr,"(Bridge Error) - Failed to allocate memory for sources");
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   203
        return -5;
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   204
    }
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   205
    
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   206
    switch (ENDIAN_BIG_32(fileformat)) {
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   207
        case OGG_FILE_FORMAT:
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            error = load_oggvorbis (filename, &format, &data, &bitsize, &freq);
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   209
            break;
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   210
        case WAV_FILE_FORMAT:
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   211
            error = load_wavpcm (filename, &format, &data, &bitsize, &freq);
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   212
            break;
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   213
        default:
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            fprintf(stderr,"(Bridge Error) - File format (%08X) not supported", ENDIAN_BIG_32(fileformat));
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   215
            return -6;
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   216
            break;
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   217
    }
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   218
    
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   219
    if (error != 0) {
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        fprintf(stderr,"(Bridge Error) - error loading file %s", filename);
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   221
        free(data);
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   222
        return -7;
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   223
    }
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   224
    
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    //copy pcm data in one buffer and free it
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    alBufferData(Buffers[globalindex], format, data, bitsize, freq);
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    free(data);
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   228
    
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   229
    if (AL_NO_ERROR != alGetError()) {
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   230
        fprintf(stderr,"(Bridge Error) - Failed to write data to buffers");
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   231
        return -8;
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   232
    }
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   233
    
3362
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   234
    /*set source properties that it will use when it's in playback*/
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   235
    alSourcei (Sources[globalindex], AL_BUFFER,   Buffers[globalindex]  );
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    alSourcef (Sources[globalindex], AL_PITCH,    1.0f                  );
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   237
    alSourcef (Sources[globalindex], AL_GAIN,     1.0f                  );
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   238
    alSourcefv(Sources[globalindex], AL_POSITION, SourcePos             );
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   239
    alSourcefv(Sources[globalindex], AL_VELOCITY, SourceVel             );
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   240
    alSourcei (Sources[globalindex], AL_LOOPING,  0                     );
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   241
    
3362
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   242
    if (AL_NO_ERROR != alGetError()) {
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   243
        fprintf(stderr,"(Bridge Error) - Failed to set Source properties");
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   244
        return -9;
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   245
    }
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   246
    
3362
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   247
    alGetError();  /* clear any AL errors beforehand */
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   248
    
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   249
    /*returns the index of the source you just loaded, increments it and exits*/
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   250
    return globalindex++;
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   251
}
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   252
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   253
8d3b4d19ce27 in reprocessing openalbridge, a lot of code cleanup and simplification
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   254
void openal_playsound (uint32_t index) {
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   255
    openal_playsound_loop (index, 0);
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   256
}
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   257
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   258
8d3b4d19ce27 in reprocessing openalbridge, a lot of code cleanup and simplification
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   259
void openal_pausesound (uint32_t index) {
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   260
    if (isBridgeReady == AL_TRUE && index < globalsize)
3362
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   261
        alSourcePause(Sources[index]);
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   262
}
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diff changeset
   263
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diff changeset
   264
3362
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   265
void openal_stopsound (uint32_t index) {
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   266
    openal_stopsound_free(index, 0);
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   267
}
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diff changeset
   268
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   269
8d3b4d19ce27 in reprocessing openalbridge, a lot of code cleanup and simplification
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   270
void openal_freesound (uint32_t index){
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   271
    if (isBridgeReady == AL_TRUE && index < globalsize)
3362
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   272
        alSourceStop(Sources[index]);
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   273
    // STUB
3362
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   274
}
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   275
8d3b4d19ce27 in reprocessing openalbridge, a lot of code cleanup and simplification
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   276
8d3b4d19ce27 in reprocessing openalbridge, a lot of code cleanup and simplification
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   277
void openal_playsound_loop (unsigned int index, char loops) {
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   278
    if (isBridgeReady == AL_TRUE && index < globalsize) {
3362
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   279
        alSourcePlay(Sources[index]);
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   280
        if (loops != 0)
3362
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   281
            openal_toggleloop(index);
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   282
    }
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   283
}
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diff changeset
   284
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   285
void openal_stopsound_free (unsigned int index, char freesource) {
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   286
    if (isBridgeReady == AL_TRUE && index < globalsize) {
3362
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diff changeset
   287
        alSourceStop(Sources[index]);
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   288
        if (freesource != 0)
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   289
            openal_freesound(index);
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diff changeset
   290
    }
3362
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   291
}
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void openal_toggleloop (uint32_t index) {
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    ALint loop;
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    if (isBridgeReady == AL_TRUE && index < globalsize) {
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        alGetSourcei (Sources[index], AL_LOOPING, &loop);
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        alSourcei (Sources[index], AL_LOOPING, !((uint8_t) loop) & 0x00000001);
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    }
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}
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void openal_setvolume (uint32_t index, float gain) {
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    if (isBridgeReady == AL_TRUE && index < globalsize)
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        alSourcef (Sources[index], AL_GAIN, gain);
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}
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void openal_setglobalvolume (float gain) {
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    if (isBridgeReady == AL_TRUE)
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        alListenerf (AL_GAIN, gain);
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}
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void openal_togglemute () {
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    ALfloat gain;
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    if (isBridgeReady == AL_TRUE) {
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        alGetListenerf (AL_GAIN, &gain);
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        if (gain > 0) {
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            old_gain = gain;
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            gain = 0;
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        } else
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            gain = old_gain;
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        alListenerf (AL_GAIN, gain);
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    }
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}
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// Fade in or out by calling a helper thread
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void openal_fade (uint32_t index, uint16_t quantity, al_fade_t direction) {
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#ifndef _WIN32
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    pthread_t thread;
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#else
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    HANDLE Thread;
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#endif
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    fade_t *fade;
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    if (isBridgeReady == AL_TRUE && index < globalsize) {
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        fade = (fade_t*) Malloc(sizeof(fade_t));
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        fade->index = index;
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        fade->quantity = quantity;
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        fade->type = direction;
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#ifndef _WIN32
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        pthread_create(&thread, NULL, (void *)helper_fade, (void *)fade);
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        pthread_detach(thread);
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#else
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        Thread = (HANDLE) _beginthread((void *)helper_fade, 0, (void *)fade);
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#endif
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    }
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}
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void openal_fadein (uint32_t index, uint16_t quantity) {
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    openal_fade(index, quantity, AL_FADE_IN);
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}
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void openal_fadeout (uint32_t index, uint16_t quantity) {
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    openal_fade(index, quantity, AL_FADE_OUT);
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}
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void openal_setposition (uint32_t index, float x, float y, float z) {
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    if (isBridgeReady == AL_TRUE && index < globalsize)
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        alSource3f(Sources[index], AL_POSITION, x, y, z);;
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}