/**
* @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 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;
}