AuroraMiddleware/AuroraOpenALSoft
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Leave SourceToListener untransformed for use with untransformed velocities

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Distance is also left untransformed so cone calculations with SoundToListener
are correct
This commit is contained in:
Chris Robinson 2008-07-03 03:13:43 -07:00
parent 2d0b12e49e
commit 3a09e446b3
1 changed files with 16 additions and 6 deletions
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22
Alc/ALu.c
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@ -273,6 +273,10 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
if(isMono != AL_FALSE)
{
//1. Translate Listener to origin (convert to head relative)
// Note that Direction and SourceToListener are *not* transformed.
// SourceToListener is used with the source and listener velocities,
// which are untransformed, and Direction is used with SourceToListener
// for the sound cone
if(ALSource->bHeadRelative==AL_FALSE)
{
// Build transform matrix
@ -290,10 +294,21 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
Position[0] -= ALContext->Listener.Position[0];
Position[1] -= ALContext->Listener.Position[1];
Position[2] -= ALContext->Listener.Position[2];
SourceToListener[0] = -Position[0];
SourceToListener[1] = -Position[1];
SourceToListener[2] = -Position[2];
// Transform source position and direction into listener space
aluMatrixVector(Position, Matrix);
aluMatrixVector(Direction, Matrix);
}
else
{
SourceToListener[0] = -Position[0];
SourceToListener[1] = -Position[1];
SourceToListener[2] = -Position[2];
}
aluNormalize(SourceToListener);
aluNormalize(Direction);
//2. Calculate distance attenuation
@ -372,11 +387,6 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
WetMix = __max(WetMix,MinVolume);
//3. Apply directional soundcones
SourceToListener[0] = -Position[0];
SourceToListener[1] = -Position[1];
SourceToListener[2] = -Position[2];
aluNormalize(SourceToListener);
Angle = aluAcos(aluDotproduct(Direction,SourceToListener)) * 180.0f /
3.141592654f;
if(Angle >= InnerAngle && Angle <= OuterAngle)