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.

2 files changed, 7 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;
 
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index b14180b2..f307ea01 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -25,6 +25,7 @@ extern ALboolean DuplicateStereo;
 
 __inline ALuint aluBytesFromFormat(ALenum format);
 __inline ALuint aluChannelsFromFormat(ALenum format);
+ALvoid aluInitPanning(ALCcontext *Context);
 ALvoid aluMixData(ALCcontext *context,ALvoid *buffer,ALsizei size,ALenum format);
 
 #ifdef __cplusplus