/**
* @brief Creates a sound environment.
*/
int sound_al_env( SoundEnv_t env, double param )
{
int i;
ALuint s;
ALfloat f;
soundLock();
switch (env) {
case SOUND_ENV_NORMAL:
/* Set global parameters. */
alSpeedOfSound( 3433. );
if (al_info.efx == AL_TRUE) {
/* Disconnect the effect. */
nalAuxiliaryEffectSloti( efx_directSlot,
AL_EFFECTSLOT_EFFECT, AL_EFFECT_NULL );
/* Set per-source parameters. */
for (i=0; i<source_ntotal; i++) {
s = source_total[i];
alSourcef( s, AL_AIR_ABSORPTION_FACTOR, 0. );
}
}
break;
case SOUND_ENV_NEBULA:
f = param / 1000.;
/* Set global parameters. */
alSpeedOfSound( 3433./(1. + f*2.) );
if (al_info.efx == AL_TRUE) {
if (al_info.efx_reverb == AL_TRUE) {
/* Tweak the reverb. */
nalEffectf( efx_reverb, AL_REVERB_DECAY_TIME, 10. );
nalEffectf( efx_reverb, AL_REVERB_DECAY_HFRATIO, 0.5 );
/* Connect the effect. */
nalAuxiliaryEffectSloti( efx_directSlot,
AL_EFFECTSLOT_EFFECT, efx_reverb );
}
/* Set per-source parameters. */
for (i=0; i<source_ntotal; i++) {
s = source_total[i];
alSourcef( s, AL_AIR_ABSORPTION_FACTOR, 3.*f );
}
}
break;
}
/* Check for errors. */
al_checkErr();
soundUnlock();
return 0;
}
/**
* @brief Enables the OpenAL EFX extension.
*
* @return 0 on success.
*/
static int al_enableEFX (void)
{
/* Get general information. */
alcGetIntegerv( al_device, ALC_MAX_AUXILIARY_SENDS, 1, &al_info.efx_auxSends );
alcGetIntegerv( al_device, ALC_EFX_MAJOR_VERSION, 1, &al_info.efx_major );
alcGetIntegerv( al_device, ALC_EFX_MINOR_VERSION, 1, &al_info.efx_minor );
/* Get function pointers. */
nalGenAuxiliaryEffectSlots = alGetProcAddress( "alGenAuxiliaryEffectSlots" );
nalDeleteAuxiliaryEffectSlots = alGetProcAddress( "alDeleteAuxiliaryEffectSlots" );
nalIsAuxiliaryEffectSlot = alGetProcAddress( "alIsAuxiliaryEffectSlot" );
nalAuxiliaryEffectSloti = alGetProcAddress( "alAuxiliaryEffectSloti" );
nalAuxiliaryEffectSlotiv = alGetProcAddress( "alAuxiliaryEffectSlotiv" );
nalAuxiliaryEffectSlotf = alGetProcAddress( "alAuxiliaryEffectSlotf" );
nalAuxiliaryEffectSlotfv = alGetProcAddress( "alAuxiliaryEffectSlotfv" );
nalGetAuxiliaryEffectSloti = alGetProcAddress( "alGetAuxiliaryEffectSloti" );
nalGetAuxiliaryEffectSlotiv = alGetProcAddress( "alGetAuxiliaryEffectSlotiv" );
nalGetAuxiliaryEffectSlotf = alGetProcAddress( "alGetAuxiliaryEffectSlotf" );
nalGetAuxiliaryEffectSlotfv = alGetProcAddress( "alGetAuxiliaryEffectSlotfv" );
nalGenFilters = alGetProcAddress( "alGenFilters" );
nalDeleteFilters = alGetProcAddress( "alDeleteFilters" );
nalFilteri = alGetProcAddress( "alFilteri" );
nalFilteriv = alGetProcAddress( "alFilteriv" );
nalFilterf = alGetProcAddress( "alFilterf" );
nalFilterfv = alGetProcAddress( "alFilterfv" );
nalGenEffects = alGetProcAddress( "alGenEffects" );
nalDeleteEffects = alGetProcAddress( "alDeleteEffects" );
nalEffecti = alGetProcAddress( "alEffecti" );
nalEffectiv = alGetProcAddress( "alEffectiv" );
nalEffectf = alGetProcAddress( "alEffectf" );
nalEffectfv = alGetProcAddress( "alEffectfv" );
if (!nalGenAuxiliaryEffectSlots || !nalDeleteAuxiliaryEffectSlots ||
!nalIsAuxiliaryEffectSlot ||
!nalAuxiliaryEffectSloti || !nalAuxiliaryEffectSlotiv ||
!nalAuxiliaryEffectSlotf || !nalAuxiliaryEffectSlotfv ||
!nalGetAuxiliaryEffectSloti || !nalGetAuxiliaryEffectSlotiv ||
!nalGetAuxiliaryEffectSlotf || !nalGetAuxiliaryEffectSlotfv ||
!nalGenFilters || !nalDeleteFilters ||
!nalFilteri || !nalFilteriv || !nalFilterf || !nalFilterfv ||
!nalGenEffects || !nalDeleteEffects ||
!nalEffecti || !nalEffectiv || !nalEffectf || !nalEffectfv) {
DEBUG("OpenAL EFX functions not found, disabling EFX.");
al_info.efx = AL_FALSE;
return -1;
}
/* Create auxiliary slot. */
nalGenAuxiliaryEffectSlots( 1, &efx_directSlot );
/* Create reverb effect. */
nalGenEffects( 1, &efx_reverb );
nalEffecti( efx_reverb, AL_EFFECT_TYPE, AL_EFFECT_REVERB );
if(alGetError() != AL_NO_ERROR) {
DEBUG("OpenAL Reverb not found, disabling.");
al_info.efx_reverb = AL_FALSE;
nalDeleteEffects( 1, &efx_reverb );
}
else {
al_info.efx_reverb = AL_TRUE;
/* Set Reverb parameters. */
/*nalEffectf( efx_reverb, AL_REVERB_DECAY_TIME, 15. );*/
}
/* Create echo effect. */
nalGenEffects( 1, &efx_echo );
nalEffecti( efx_echo, AL_EFFECT_TYPE, AL_EFFECT_ECHO );
if(alGetError() != AL_NO_ERROR) {
DEBUG("OpenAL Echo not found, disabling.");
al_info.efx_echo = AL_FALSE;
nalDeleteEffects( 1, &efx_echo );
}
else {
al_info.efx_echo = AL_TRUE;
/* Set Echo parameters. */
nalEffectf( efx_echo, AL_ECHO_DELAY, 0.207 );
}
/* Set up the listener. */
alListenerf( AL_METERS_PER_UNIT, 5. );
/* Check for errors. */
al_checkErr();
return 0;
}
/**
* @brief Creates a sound environment.
*/
int sound_al_env( SoundEnv_t env, double param )
{
int i;
ALuint s;
ALfloat f;
soundLock();
switch (env) {
case SOUND_ENV_NORMAL:
/* Set global parameters. */
alSpeedOfSound( 3433. );
if (al_info.efx == AL_TRUE) {
/* Disconnect the effect. */
nalAuxiliaryEffectSloti( efx_directSlot,
AL_EFFECTSLOT_EFFECT, AL_EFFECT_NULL );
/* Set per-source parameters. */
for (i=0; i<source_ntotal; i++) {
s = source_total[i];
alSourcef( s, AL_AIR_ABSORPTION_FACTOR, 0. );
}
}
break;
case SOUND_ENV_NEBULA:
f = param / 1000.;
/* Set global parameters. */
alSpeedOfSound( 3433./(1. + f*2.) );
if (al_info.efx == AL_TRUE) {
if (al_info.efx_reverb == AL_TRUE) {
/* Tweak the reverb. */
nalEffectf( efx_reverb, AL_REVERB_DECAY_TIME, 10. );
nalEffectf( efx_reverb, AL_REVERB_DECAY_HFRATIO, 0.5 );
/* Connect the effect. */
nalAuxiliaryEffectSloti( efx_directSlot,
AL_EFFECTSLOT_EFFECT, efx_reverb );
}
/* Set per-source parameters. */
for (i=0; i<source_ntotal; i++) {
s = source_total[i];
/* Value is from 0. (normal) to 10..
* It represents the attenuation per meter. In this case it decreases by
* 0.05*AB_FACTOR dB/meter where AB_FACTOR is the air absoprtion factor.
* In our case each pixel represents 5 meters.
*/
alSourcef( s, AL_AIR_ABSORPTION_FACTOR, 3.*f );
}
}
break;
}
/* Check for errors. */
al_checkErr();
soundUnlock();
return 0;
}
