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Improve index calculation for reverb modulation updates

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This commit is contained in:
Chris Robinson 2011-10-01 02:38:28 -07:00
parent 0e7dc93681
commit a486045f7c
1 changed files with 5 additions and 10 deletions
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15
Alc/alcReverb.c
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@ -876,7 +876,7 @@ static __inline ALfloat CalcDampingCoeff(ALfloat hfRatio, ALfloat length, ALfloa
// downswing will sound stronger than the upswing.
static ALvoid UpdateModulator(ALfloat modTime, ALfloat modDepth, ALuint frequency, ALverbState *State)
{
ALfloat length;
ALuint range;
/* Modulation is calculated in two parts.
*
@ -886,15 +886,10 @@ static ALvoid UpdateModulator(ALfloat modTime, ALfloat modDepth, ALuint frequenc
* minimum (1 sample) and when the timing changes, the index is rescaled
* to the new range (to keep the sinus consistent).
*/
length = modTime * frequency;
if (length >= 1.0f) {
State->Mod.Index = fastf2u(State->Mod.Index * length /
State->Mod.Range);
State->Mod.Range = fastf2u(length);
} else {
State->Mod.Index = 0;
State->Mod.Range = 1;
}
range = maxu(fastf2u(modTime*frequency), 1);
State->Mod.Index = (ALuint)(State->Mod.Index * (ALuint64)range /
State->Mod.Range);
State->Mod.Range = range;
/* The modulation depth effects the amount of frequency change over the
* range of the sinus. It needs to be scaled by the modulation time so