Add some source fields for HRTF data

OpenAL32/Include/alMain.h

@@ -584,6 +584,10 @@ void SetDefaultWFXChannelOrder(ALCdevice *device);
 ALboolean IsValidType(ALenum type);
 ALboolean IsValidChannels(ALenum type);
 
+#define HRTF_BITS        (7)
+#define HRTF_LENGTH      (1<<HRTF_BITS)
+#define HRTF_LENGTH_MASK (HRTF_LENGTH-1)
+
 void al_print(const char *fname, unsigned int line, const char *fmt, ...)
              PRINTF_STYLE(3,4);
 #define AL_PRINT(...) al_print(__FILE__, __LINE__, __VA_ARGS__)

OpenAL32/Include/alSource.h

@@ -86,11 +86,17 @@ typedef struct ALsource
     // Source Type (Static, Streaming, or Undetermined)
     ALint  lSourceType;
 
+    /* HRTF info */
+    ALfloat HrtfHistory[HRTF_LENGTH];
+    ALuint HrtfOffset;
+
     // Current target parameters used for mixing
     ALboolean NeedsUpdate;
     struct {
         ALint Step;
 
+        ALfloat HrtfCoeffs[HRTF_LENGTH][2];
+
         /* A mixing matrix. First subscript is the channel number of the input
          * data (regardless of channel configuration) and the second is the
          * channel target (eg. FRONT_LEFT) */