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Apply distance attenuation to reverb zones in almultireverb

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This commit is contained in:
Chris Robinson 2018-02-28 20:59:41 -08:00
parent 812cb62617
commit abc6e37e6e
1 changed files with 18 additions and 2 deletions
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20
examples/almultireverb.c
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@ -500,16 +500,20 @@ int main(int argc, char **argv)
other_dir[1] = local_norm[1] / -2.0f;
other_dir[2] = local_norm[2] / -2.0f;
alEffectf(effects[0], AL_EAXREVERB_GAIN, reverb0.flGain);
alEffectfv(effects[0], AL_EAXREVERB_REFLECTIONS_PAN, this_dir);
alEffectfv(effects[0], AL_EAXREVERB_LATE_REVERB_PAN, this_dir);
alEffectf(effects[1], AL_EAXREVERB_GAIN, reverb1.flGain);
alEffectfv(effects[1], AL_EAXREVERB_REFLECTIONS_PAN, other_dir);
alEffectfv(effects[1], AL_EAXREVERB_LATE_REVERB_PAN, other_dir);
}
else
{
const EFXEAXREVERBPROPERTIES *other_reverb;
const EFXEAXREVERBPROPERTIES *this_reverb;
ALuint other_effect, this_effect;
ALfloat spread;
ALfloat spread, attn;
/* Normalize the direction to the portal. */
local_dir[0] /= dist;
@ -521,6 +525,12 @@ int main(int argc, char **argv)
*/
local_radius = portal_radius * fabsf(dot_product(local_dir, local_norm));
/* Calculate distance attenuation for the other zone, using the
* standard inverse distance model with the radius as a reference.
*/
attn = local_radius / dist;
if(attn > 1.0f) attn = 1.0f;
/* Calculate the 'spread' of the portal, which is the amount of
* coverage the other zone has around the listener.
*/
@ -534,12 +544,16 @@ int main(int argc, char **argv)
/* We're in front of the portal, so we're in Zone 0. */
this_effect = effects[0];
other_effect = effects[1];
this_reverb = &reverb0;
other_reverb = &reverb1;
}
else
{
/* We're behind the portal, so we're in Zone 1. */
this_effect = effects[1];
other_effect = effects[0];
this_reverb = &reverb1;
other_reverb = &reverb0;
}
/* Scale the other zone's panning vector down as the portal's
@ -555,10 +569,12 @@ int main(int argc, char **argv)
this_dir[1] = local_dir[1] * -spread;
this_dir[2] = local_dir[2] * -spread;
/* Now set the effects' panning vectors. */
/* Now set the effects' panning vectors and distance attenuation. */
alEffectf(this_effect, AL_EAXREVERB_GAIN, this_reverb->flGain);
alEffectfv(this_effect, AL_EAXREVERB_REFLECTIONS_PAN, this_dir);
alEffectfv(this_effect, AL_EAXREVERB_LATE_REVERB_PAN, this_dir);
alEffectf(other_effect, AL_EAXREVERB_GAIN, other_reverb->flGain * attn);
alEffectfv(other_effect, AL_EAXREVERB_REFLECTIONS_PAN, other_dir);
alEffectfv(other_effect, AL_EAXREVERB_LATE_REVERB_PAN, other_dir);
}