Reimplement panning using lookup tables, based on a patch by Christian Borss

This allows speaker positions to be specified by discrete angles around the
listener, providing more flexibility and configurability in placement.
Additional patches to take advantage of this are forthcoming.

1 files changed, 6 insertions, 0 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 042ab779..de53b072 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -129,6 +129,9 @@ extern char _alDebug[256];
 
 #define LOWPASSFREQCUTOFF          (5000)
 
+#define QUADRANT_NUM 128
+#define LUT_NUM (4 * QUADRANT_NUM)
+
 
 typedef struct {
     ALCboolean (*OpenPlayback)(ALCdevice*, const ALCchar*);
@@ -206,6 +209,9 @@ struct ALCcontext_struct
     ALint       lNumMonoSources;
     ALint       lNumStereoSources;
 
+    ALfloat     PanningLUT[OUTPUTCHANNELS * LUT_NUM];
+    ALint       NumChan;
+
     ALCdevice  *Device;
     const ALCchar *ExtensionList;