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Fix low-pass coefficient calculation

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This commit is contained in:
Chris Robinson
2008-11-18 04:31:24 -08:00
parent 13a2e6ef1f
commit 76c7789ee7
1 changed files with 10 additions and 7 deletions
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Alc/alcReverb.c
+10 -7
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@@ -483,10 +483,16 @@ ALvoid VerbUpdate(ALCcontext *Context, ALeffectslot *Slot, ALeffect *Effect)
// Calculate the delay offset for the variable-length delay
// lines.
State->Late.Offset[index] = (ALuint)(length * Context->Frequency);
}
// Calculate the gain (coefficient) for each line.
State->Late.Coeff[index] = pow(10.0f, length / Effect->Reverb.DecayTime *
-60.0f / 20.0f);
if(index >= 4)
{
// Calculate the decay equation for each low-pass filter.
g = pow(10.0f, length / (Effect->Reverb.DecayTime * hfRatio) *
-60.0f / 20.0f);
-60.0f / 20.0f) /
State->Late.Coeff[index];
g = __max(g, 0.1f);
g *= g;
// Calculate the gain (coefficient) for each low-pass filter.
@@ -498,10 +504,6 @@ ALvoid VerbUpdate(ALCcontext *Context, ALeffectslot *Slot, ALeffect *Effect)
// upper bound to the coefficient.
State->Late.LpCoeff[index2] = __min(lpcoeff, 0.98f);
}
// Calculate the gain (coefficient) for each line.
State->Late.Coeff[index] = pow(10.0f, length / Effect->Reverb.DecayTime *
-60.0f / 20.0f);
}
// This just calculates the coefficient for the late reverb input low-
@@ -510,7 +512,8 @@ 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);
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 = __max(g, 0.1f);
g *= g;