al_init.cpp

Go to the documentation of this file.

#include "audiolib.h"
#include "config_xml.h"
#include "xml_support.h"
#include "vs_globals.h"

#ifdef HAVE_AL
#ifdef __APPLE__
#include <al.h>
#include <alc.h>
#define KeyMap AppleKeyMap
#undef KeyMap
#else
#include <AL/al.h>
#include <AL/alc.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include "al_globals.h"
#include <vector>

#if 1
#define AL_GET_PROC( name ) ( alGetProcAddress( const_cast< ALubyte* > ( reinterpret_cast< const ALubyte* > (name) ) ) )
#else
#define AL_GET_PROC( name ) ( alGetProcAddress( name ) )
#endif

static void fixup_function_pointers( void )
{
    /* UNCOMMENT AS NEEDED
     *     talcGetAudioChannel = (ALfloat (*)(ALuint channel))
     *                             GP("alcGetAudioChannel_LOKI");
     *     talcSetAudioChannel = (void (*)(ALuint channel, ALfloat volume))
     *                             GP("alcSetAudioChannel_LOKI");
     *
     *     talMute   = (void (*)(ALvoid)) GP("alMute_LOKI");
     *     talUnMute = (void (*)(ALvoid)) GP("alUnMute_LOKI");
     *
     *     talReverbScale = (void (*)(ALuint sid, ALfloat param))
     *             GP("alReverbScale_LOKI");
     *     talReverbDelay = (void (*)(ALuint sid, ALfloat param))
     *             GP("alReverbDelay_LOKI");
     *
     *     talBombOnError = (void (*)(void))
     *             GP("alBombOnError_LOKI");
     *
     *     if(talBombOnError == NULL) {
     *             VSFileSystem::vs_fprintf(stderr,
     *                     "Could not GetProcAddress alBombOnError_LOKI\n");
     *             exit(1);
     *     }
     *
     *     talBufferi = (void (*)(ALuint, ALenum, ALint ))
     *             GP("alBufferi_LOKI");
     *
     *     if(talBufferi == NULL) {
     *             VSFileSystem::vs_fprintf(stderr,
     *                     "Could not GetProcAddress alBufferi_LOKI\n");
     *             exit(1);
     *     }
     *
     *     alCaptureInit    = (ALboolean (*)( ALenum, ALuint, ALsizei )) GP("alCaptureInit_EXT");
     *     alCaptureDestroy = (ALboolean (*)( ALvoid )) GP("alCaptureDestroy_EXT");
     *     alCaptureStart   = (ALboolean (*)( ALvoid )) GP("alCaptureStart_EXT");
     *     alCaptureStop    = (ALboolean (*)( ALvoid )) GP("alCaptureStop_EXT");
     *     alCaptureGetData = (ALsizei (*)( ALvoid*, ALsizei, ALenum, ALuint )) GP("alCaptureGetData_EXT");
     *
     *     talBufferAppendData = (ALuint (*)(ALuint, ALenum, ALvoid *, ALint, ALint)) GP("alBufferAppendData_LOKI");
     *     talBufferAppendWriteData = (ALuint (*)(ALuint, ALenum, ALvoid *, ALint, ALint, ALenum)) GP("alBufferAppendWriteData_LOKI");
     *
     *     talGenStreamingBuffers = (void (*)(ALsizei n, ALuint *bids )) GP("alGenStreamingBuffers_LOKI");
     *     if( talGenStreamingBuffers == NULL ) {
     *             VSFileSystem::vs_fprintf( stderr, "Could not GP alGenStreamingBuffers_LOKI\n");
     *             exit(1);
     *     }
     *
     *
     *
     */
}
#endif
void AUDChangeVolume( float volume )
{
#ifdef HAVE_AL
    if (volume == 0) {
        usepositional = false;
        return;
    } else {
        usepositional = true;
    }
    scalepos = 1./volume;
#endif
}
float AUDGetVolume()
{
#ifdef HAVE_AL
    return 1./scalepos;

#else
    return 1;
#endif
}
void AUDChangeDoppler( float doppler )
{
#ifdef HAVE_AL
    if (doppler <= 0)
        usedoppler = false;
    else
        usedoppler = true;
    scalevel = doppler;
#endif
}
float AUDGetDoppler()
{
#ifdef HAVE_AL
    return scalevel;

#else
    return 1;
#endif
}

#ifdef HAVE_AL
static ALCdevice  *dev = NULL;

#ifndef _WIN32
static ALvoid     *context_id = NULL;
#else
static ALCcontext *context_id = NULL;
#endif
#endif
bool AUDInit()
{
    g_game.sound_enabled = 
    g_game.music_enabled = false;
#ifdef HAVE_AL
    usedoppler    = XMLSupport::parse_bool( vs_config->getVariable( "audio", "Doppler", "false" ) );
    usepositional = XMLSupport::parse_bool( vs_config->getVariable( "audio", "Positional", "true" ) );
    double linuxadjust=1;
#ifndef _WIN32
#ifndef __APPLE__
    linuxadjust=1./3.;
#endif
#endif
    scalepos = 1.0f/(XMLSupport::parse_float( vs_config->getVariable( "audio", "Volume", "100" ) )
                  *linuxadjust
        );
    scalevel = XMLSupport::parse_float( vs_config->getVariable( "audio", "DopplerScale", "1" ) );
    //enabled = XMLSupport::parse_bool (vs_config->getVariable ("audio","enabled","true"));
    g_game.audio_frequency_mode = XMLSupport::parse_int( vs_config->getVariable( "audio", "frequency", "48000" ) );
    maxallowedsingle     = XMLSupport::parse_int( vs_config->getVariable( "audio", "MaxSingleSounds", "8" ) );
    g_game.max_sound_sources = 
    maxallowedtotal      = XMLSupport::parse_int( vs_config->getVariable( "audio", "MaxTotalSounds", "20" ) );
    bool sound_enabled = XMLSupport::parse_bool( vs_config->getVariable( "audio", "Sound", "true" ) );
    bool music_enabled = XMLSupport::parse_bool( vs_config->getVariable( "audio", "Music", "true" ) );
    if (!sound_enabled && !music_enabled)
        return false;
    int attrlist[] = {ALC_FREQUENCY, g_game.audio_frequency_mode, 0};
#ifdef _WIN32
    dev = alcOpenDevice(  (ALCchar*)"DirectSound3D" );
    // dev = alcOpenDevice(  (ALCubyte*)"DirectSound3D" ); pre update. New includes barf on ubyte. cannot convert parameter.
#else
#ifdef __APPLE__
    dev = alcOpenDevice( "sdl" );
    if (dev == NULL)
        dev = alcOpenDevice( NULL );
#else
    dev = alcOpenDevice( NULL );
#endif
#endif
    if (dev == NULL)
        return false;
    context_id = alcCreateContext( dev, attrlist );
    if (context_id == NULL) {
        alcCloseDevice( dev );
        return false;
    }
    alcMakeContextCurrent( (ALCcontext*) context_id );

    fixup_function_pointers();
    ALenum alGetEr = 0;
    ALuint cursrc;
    alGetError();
    alGenSources( 1, &cursrc );
    alGetEr = alGetError();
    while (alGetEr == 0) {
        unusedsrcs.push_back( cursrc );
        if (unusedsrcs.size() >= maxallowedtotal)
            break;
        alGenSources( 1, &cursrc );
        alGetEr = alGetError();
    }
    
    alDistanceModel(AL_INVERSE_DISTANCE_CLAMPED);
    
    g_game.sound_enabled = sound_enabled;
    g_game.music_enabled = music_enabled;
    
    return true;
#endif
    return false;
}

void AUDDestroy()
{
#ifdef HAVE_AL
    //Go through and delete all loaded wavs
    unsigned int i;
    for (i = 0; i < sounds.size(); i++) {
        if (sounds[i].buffer != 0)
            AUDStopPlaying( i );
        AUDDeleteSound( i );
    }
    for (i = 0; i < unusedsrcs.size(); i++)
        alDeleteSources( 1, &unusedsrcs[i] );
    for (i = 0; i < buffers.size(); i++)
        alDeleteBuffers( 1, &buffers[i] );
    buffers.clear();
    if (context_id)
        alcDestroyContext( (ALCcontext*) context_id );
    if (dev)
        alcCloseDevice( dev );
#endif
}