From 530002e168c907bd3468cd0fefaec2565e248bbd Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 7 Aug 2017 01:38:26 -0700
Subject: Avoid re-selecting the direct HRTF mix function

---
 Alc/ALc.c              |  1 +
 Alc/ALu.c              | 37 ++++++++++++++++++++++---------------
 OpenAL32/Include/alu.h |  2 ++
 3 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/Alc/ALc.c b/Alc/ALc.c
index b367dd1d..a1c17087 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -1001,6 +1001,7 @@ static void alc_initconfig(void)
 #endif
     ConfigValueInt(NULL, NULL, "rt-prio", &RTPrioLevel);
 
+    aluInit();
     aluInitMixer();
 
     str = getenv("ALSOFT_TRAP_ERROR");
diff --git a/Alc/ALu.c b/Alc/ALu.c
index 5230d4c6..8055ac91 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -43,18 +43,6 @@
 #include "backends/base.h"
 
 
-struct ChanMap {
-    enum Channel channel;
-    ALfloat angle;
-    ALfloat elevation;
-};
-
-/* Cone scalar */
-ALfloat ConeScale = 1.0f;
-
-/* Localized Z scalar for mono sources */
-ALfloat ZScale = 1.0f;
-
 extern inline ALfloat minf(ALfloat a, ALfloat b);
 extern inline ALfloat maxf(ALfloat a, ALfloat b);
 extern inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max);
@@ -92,6 +80,13 @@ extern inline void aluMatrixfSet(aluMatrixf *matrix,
                                  ALfloat m20, ALfloat m21, ALfloat m22, ALfloat m23,
                                  ALfloat m30, ALfloat m31, ALfloat m32, ALfloat m33);
 
+
+/* Cone scalar */
+ALfloat ConeScale = 1.0f;
+
+/* Localized Z scalar for mono sources */
+ALfloat ZScale = 1.0f;
+
 const aluMatrixf IdentityMatrixf = {{
     { 1.0f, 0.0f, 0.0f, 0.0f },
     { 0.0f, 1.0f, 0.0f, 0.0f },
@@ -100,6 +95,15 @@ const aluMatrixf IdentityMatrixf = {{
 }};
 
 
+struct ChanMap {
+    enum Channel channel;
+    ALfloat angle;
+    ALfloat elevation;
+};
+
+static HrtfDirectMixerFunc MixDirectHrtf = MixDirectHrtf_C;
+
+
 void DeinitVoice(ALvoice *voice)
 {
     struct ALvoiceProps *props;
@@ -206,6 +210,11 @@ static aluVector aluMatrixfVector(const aluMatrixf *mtx, const aluVector *vec)
 }
 
 
+void aluInit(void)
+{
+    MixDirectHrtf = SelectHrtfMixer();
+}
+
 /* Prepares the interpolator for a given rate (determined by increment).  A
  * result of AL_FALSE indicates that the filter output will completely cut
  * the input signal.
@@ -1729,7 +1738,6 @@ void aluMixData(ALCdevice *device, ALvoid *OutBuffer, ALsizei NumSamples)
 
         if(device->HrtfHandle)
         {
-            HrtfDirectMixerFunc HrtfMix;
             DirectHrtfState *state;
             int lidx, ridx;
 
@@ -1743,11 +1751,10 @@ void aluMixData(ALCdevice *device, ALvoid *OutBuffer, ALsizei NumSamples)
             ridx = GetChannelIdxByName(device->RealOut, FrontRight);
             assert(lidx != -1 && ridx != -1);
 
-            HrtfMix = SelectHrtfMixer();
             state = device->Hrtf;
             for(c = 0;c < device->Dry.NumChannels;c++)
             {
-                HrtfMix(device->RealOut.Buffer[lidx], device->RealOut.Buffer[ridx],
+                MixDirectHrtf(device->RealOut.Buffer[lidx], device->RealOut.Buffer[ridx],
                     device->Dry.Buffer[c], state->Offset, state->IrSize,
                     SAFE_CONST(ALfloat2*,state->Chan[c].Coeffs),
                     state->Chan[c].Values, SamplesToDo
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index 794bdec9..b62bb024 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -403,6 +403,8 @@ enum HrtfRequestMode {
     Hrtf_Disable = 2,
 };
 
+void aluInit(void);
+
 void aluInitMixer(void);
 
 MixerFunc SelectMixer(void);
-- 
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