/** * @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; }