Use second-order ambisonics for basic HRTF rendering

This should improve positional quality for relatively low cost. Full HRTF
rendering still only uses first-order since the only use of the dry buffer
there is for first-order content (B-Format buffers, effects).

1 files changed, 7 insertions, 0 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index dc979522..192f2a35 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -1488,6 +1488,13 @@ ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
         {
             int lidx = GetChannelIdxByName(device->RealOut, FrontLeft);
             int ridx = GetChannelIdxByName(device->RealOut, FrontRight);
+
+            if(device->AmbiUp)
+                ambiup_process(device->AmbiUp,
+                    device->Dry.Buffer, device->Dry.NumChannels,
+                    SAFE_CONST(ALfloatBUFFERSIZE*,device->FOAOut.Buffer), SamplesToDo
+                );
+
             if(lidx != -1 && ridx != -1)
             {
                 HrtfDirectMixerFunc HrtfMix = SelectHrtfMixer();