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Simplify in-sample low-pass filter coefficient calculation

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This commit is contained in:
Chris Robinson
2008-11-18 06:35:00 -08:00
parent 76c7789ee7
commit c8123756ff
1 changed files with 5 additions and 6 deletions
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Alc/alcReverb.c
+5 -6
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@@ -476,12 +476,9 @@ ALvoid VerbUpdate(ALCcontext *Context, ALeffectslot *Slot, ALeffect *Effect)
length = LATE_LINE_LENGTH[index];
if(index >= 4)
{
index2 = index - 3;
length *= 1.0f + (Effect->Reverb.Density * LATE_LINE_MULTIPLIER);
// Calculate the delay offset for the variable-length delay
// lines.
length *= 1.0f + (Effect->Reverb.Density * LATE_LINE_MULTIPLIER);
State->Late.Offset[index] = (ALuint)(length * Context->Frequency);
}
// Calculate the gain (coefficient) for each line.
@@ -489,6 +486,8 @@ ALvoid VerbUpdate(ALCcontext *Context, ALeffectslot *Slot, ALeffect *Effect)
-60.0f / 20.0f);
if(index >= 4)
{
index2 = index - 3;
// Calculate the decay equation for each low-pass filter.
g = pow(10.0f, length / (Effect->Reverb.DecayTime * hfRatio) *
-60.0f / 20.0f) /
@@ -512,8 +511,8 @@ ALvoid VerbUpdate(ALCcontext *Context, ALeffectslot *Slot, ALeffect *Effect)
length = LATE_LINE_LENGTH[5] * (1.0f + Effect->Reverb.Density * LATE_LINE_MULTIPLIER) +
LATE_LINE_LENGTH[6] * (1.0f + Effect->Reverb.Density * LATE_LINE_MULTIPLIER);
g = pow(10.0f, length / (Effect->Reverb.DecayTime * hfRatio) * -30.0f / 20.0f) /
pow(10.0f, length / Effect->Reverb.DecayTime * -30.0f / 20.0f);
g = pow(10.0f, ((length / (Effect->Reverb.DecayTime * hfRatio))-
(length / Effect->Reverb.DecayTime)) * -30.0f / 20.0f);
g = __max(g, 0.1f);
g *= g;