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authorChris Robinson <[email protected]>2011-10-01 02:38:28 -0700
committerChris Robinson <[email protected]>2011-10-01 02:38:28 -0700
commita486045f7cade874d422a03277be4db8c14e8f24 (patch)
tree075c3000832de467df3251c7c92deb54a29d0eeb /Alc/alcReverb.c
parent0e7dc93681278e73aa76ce3bf0cb0ff1e340455a (diff)
Improve index calculation for reverb modulation updates
Diffstat (limited to 'Alc/alcReverb.c')
-rw-r--r--Alc/alcReverb.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/Alc/alcReverb.c b/Alc/alcReverb.c
index 1323c497..589be6e3 100644
--- a/Alc/alcReverb.c
+++ b/Alc/alcReverb.c
@@ -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