Dima353/openal-soft
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Pre-apply the a[0] EQ filter coefficient

Browse Source 
Saves 20 fp divisions per sample
This commit is contained in:
Chris Robinson
2013-05-26 17:04:45 -07:00
parent 4bf5466f64
commit 0a4be3470e
1 changed files with 11 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Alc/effects/equalizer.c
+11 -5
View File
@@ -216,6 +216,12 @@ static ALvoid ALequalizerState_Update(ALequalizerState *state, ALCdevice *device
state->bandfilter[it].a[2] = 1.0f - alpha / gain;
break;
}
state->bandfilter[it].b[0] /= state->bandfilter[it].a[0];
state->bandfilter[it].b[1] /= state->bandfilter[it].a[0];
state->bandfilter[it].b[2] /= state->bandfilter[it].a[0];
state->bandfilter[it].a[0] /= state->bandfilter[it].a[0];
state->bandfilter[it].a[1] /= state->bandfilter[it].a[0];
state->bandfilter[it].a[2] /= state->bandfilter[it].a[0];
}
}
@@ -240,11 +246,11 @@ static ALvoid ALequalizerState_Process(ALequalizerState *state, ALuint SamplesTo
{
ALEQFilter *filter = &state->bandfilter[ft];
tempsmp = filter->b[0] / filter->a[0] * smp +
filter->b[1] / filter->a[0] * filter->x[0] +
filter->b[2] / filter->a[0] * filter->x[1] -
filter->a[1] / filter->a[0] * filter->y[0] -
filter->a[2] / filter->a[0] * filter->y[1];
tempsmp = filter->b[0] * smp +
filter->b[1] * filter->x[0] +
filter->b[2] * filter->x[1] -
filter->a[1] * filter->y[0] -
filter->a[2] * filter->y[1];
filter->x[1] = filter->x[0];
filter->x[0] = smp;