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Use the square root to build the panning table instead of sin/cos

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Chris Robinson
2011-10-10 09:39:02 -07:00
parent 3324bab81e
commit 3bbde05e0e
1 changed files with 8 additions and 8 deletions
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Alc/panning.c
+8 -8
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@@ -293,10 +293,10 @@ ALvoid aluInitPanning(ALCdevice *Device)
if(Theta >= SpeakerAngle[s] && Theta < SpeakerAngle[s+1])
{
/* source between speaker s and speaker s+1 */
Alpha = F_PI_2 * (Theta-SpeakerAngle[s]) /
(SpeakerAngle[s+1]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluCos(Alpha);
PanningLUT[Speaker2Chan[s+1]] = aluSin(Alpha);
Alpha = (Theta-SpeakerAngle[s]) /
(SpeakerAngle[s+1]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluSqrt(1.0f-Alpha);
PanningLUT[Speaker2Chan[s+1]] = aluSqrt( Alpha);
break;
}
}
@@ -305,10 +305,10 @@ ALvoid aluInitPanning(ALCdevice *Device)
/* source between last and first speaker */
if(Theta < SpeakerAngle[0])
Theta += F_PI*2.0f;
Alpha = F_PI_2 * (Theta-SpeakerAngle[s]) /
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluCos(Alpha);
PanningLUT[Speaker2Chan[0]] = aluSin(Alpha);
Alpha = (Theta-SpeakerAngle[s]) /
(F_PI*2.0f + SpeakerAngle[0]-SpeakerAngle[s]);
PanningLUT[Speaker2Chan[s]] = aluSqrt(1.0f-Alpha);
PanningLUT[Speaker2Chan[0]] = aluSqrt( Alpha);
}
}
}