Partially revert "Use a different method for HRTF mixing"

The sound localization with virtual channel mixing was just too poor, so while
it's more costly to do per-source HRTF mixing, it's unavoidable if you want
good localization.

This is only partially reverted because having the virtual channel is still
beneficial, particularly with B-Format rendering and effect mixing which
otherwise skip HRTF processing. As before, the number of virtual channels can
potentially be customized, specifying more or less channels depending on the
system's needs.

1 files changed, 17 insertions, 0 deletions

diff --git a/Alc/mixer_c.c b/Alc/mixer_c.c
index caedd339..0fdcc087 100644
--- a/Alc/mixer_c.c
+++ b/Alc/mixer_c.c
@@ -59,6 +59,23 @@ void ALfilterState_processC(ALfilterState *filter, ALfloat *restrict dst, const
 }
 
 
+static inline void ApplyCoeffsStep(ALuint Offset, ALfloat (*restrict Values)[2],
+                                   const ALuint IrSize,
+                                   ALfloat (*restrict Coeffs)[2],
+                                   const ALfloat (*restrict CoeffStep)[2],
+                                   ALfloat left, ALfloat right)
+{
+    ALuint c;
+    for(c = 0;c < IrSize;c++)
+    {
+        const ALuint off = (Offset+c)&HRIR_MASK;
+        Values[off][0] += Coeffs[c][0] * left;
+        Values[off][1] += Coeffs[c][1] * right;
+        Coeffs[c][0] += CoeffStep[c][0];
+        Coeffs[c][1] += CoeffStep[c][1];
+    }
+}
+
 static inline void ApplyCoeffs(ALuint Offset, ALfloat (*restrict Values)[2],
                                const ALuint IrSize,
                                ALfloat (*restrict Coeffs)[2],