Add a method to calculate gains given a sound point and its half-width, and use it for reverb

The half-width ranges from 0 to pi, and essentially specifies the coverage area
around the listener. At 0, it's an infinitely small point sound and behaves
like a usual panning sound. At pi/2 it covers half the area, and at pi it
covers the whole area.

1 files changed, 2 insertions, 0 deletions

diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index 9d1eb81b..ff5601e5 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -298,6 +298,8 @@ static __inline void aluNormalize(ALfloat *inVector)
 ALvoid aluInitPanning(ALCdevice *Device);
 ALint aluCart2LUTpos(ALfloat im, ALfloat re);
 
+ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains);
+
 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);