kcat/openal-soft
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Apply distance attenuation to reverb zones in almultireverb

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
examples/almultireverb.c
View File

@ -500,16 +500,20 @@ int main(int argc, char **argv)
other_dir[1] = local_norm[1] / -2.0f; other_dir[1] = local_norm[1] / -2.0f;
other_dir[2] = local_norm[2] / -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_REFLECTIONS_PAN, this_dir);
alEffectfv(effects[0], AL_EAXREVERB_LATE_REVERB_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_REFLECTIONS_PAN, other_dir);
alEffectfv(effects[1], AL_EAXREVERB_LATE_REVERB_PAN, other_dir); alEffectfv(effects[1], AL_EAXREVERB_LATE_REVERB_PAN, other_dir);
} }
else else
{ {
const EFXEAXREVERBPROPERTIES *other_reverb;
const EFXEAXREVERBPROPERTIES *this_reverb;
ALuint other_effect, this_effect; ALuint other_effect, this_effect;
ALfloat spread; ALfloat spread, attn;
/* Normalize the direction to the portal. */ /* Normalize the direction to the portal. */
local_dir[0] /= dist; 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)); 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 /* Calculate the 'spread' of the portal, which is the amount of
* coverage the other zone has around the listener. * 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. */ /* We're in front of the portal, so we're in Zone 0. */
this_effect = effects[0]; this_effect = effects[0];
other_effect = effects[1]; other_effect = effects[1];
this_reverb = &reverb0;
other_reverb = &reverb1;
} }
else else
{ {
/* We're behind the portal, so we're in Zone 1. */ /* We're behind the portal, so we're in Zone 1. */
this_effect = effects[1]; this_effect = effects[1];
other_effect = effects[0]; other_effect = effects[0];
this_reverb = &reverb1;
other_reverb = &reverb0;
} }
/* Scale the other zone's panning vector down as the portal's /* 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[1] = local_dir[1] * -spread;
this_dir[2] = local_dir[2] * -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_REFLECTIONS_PAN, this_dir);
alEffectfv(this_effect, AL_EAXREVERB_LATE_REVERB_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_REFLECTIONS_PAN, other_dir);
alEffectfv(other_effect, AL_EAXREVERB_LATE_REVERB_PAN, other_dir); alEffectfv(other_effect, AL_EAXREVERB_LATE_REVERB_PAN, other_dir);
} }