From 13608d4d61884a21ca5790b22fa121c2359253ed Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 24 Nov 2014 01:31:38 -0800
Subject: Move the voice's last position and gain out of the Hrtf container

---
 Alc/ALu.c              | 20 ++++++++++----------
 OpenAL32/Include/alu.h |  5 +++--
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 393740ad..85948084 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -998,8 +998,8 @@ ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCconte
         if(voice->Direct.Moving)
         {
             /* Calculate the normalized HRTF transition factor (delta). */
-            delta = CalcHrtfDelta(voice->Direct.Hrtf.Gain, DryGain,
-                                  voice->Direct.Hrtf.Dir, Position);
+            delta = CalcHrtfDelta(voice->Direct.LastGain, DryGain,
+                                  voice->Direct.LastDir, Position);
             /* If the delta is large enough, get the moving HRIR target
              * coefficients, target delays, steppping values, and counter. */
             if(delta > 0.001f)
@@ -1010,10 +1010,10 @@ ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCconte
                     voice->Direct.Hrtf.Params[0].CoeffStep, voice->Direct.Hrtf.Params[0].DelayStep
                 );
                 voice->Direct.Counter = counter;
-                voice->Direct.Hrtf.Gain = DryGain;
-                voice->Direct.Hrtf.Dir[0] = Position[0];
-                voice->Direct.Hrtf.Dir[1] = Position[1];
-                voice->Direct.Hrtf.Dir[2] = Position[2];
+                voice->Direct.LastGain = DryGain;
+                voice->Direct.LastDir[0] = Position[0];
+                voice->Direct.LastDir[1] = Position[1];
+                voice->Direct.LastDir[2] = Position[2];
             }
         }
         else
@@ -1024,10 +1024,10 @@ ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCconte
                                 voice->Direct.Hrtf.Params[0].Delay);
             voice->Direct.Counter = 0;
             voice->Direct.Moving  = AL_TRUE;
-            voice->Direct.Hrtf.Gain = DryGain;
-            voice->Direct.Hrtf.Dir[0] = Position[0];
-            voice->Direct.Hrtf.Dir[1] = Position[1];
-            voice->Direct.Hrtf.Dir[2] = Position[2];
+            voice->Direct.LastGain = DryGain;
+            voice->Direct.LastDir[0] = Position[0];
+            voice->Direct.LastDir[1] = Position[1];
+            voice->Direct.LastDir[2] = Position[2];
         }
         voice->Direct.Hrtf.IrSize = GetHrtfIrSize(Device->Hrtf);
 
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h
index 0462fda8..f4871413 100644
--- a/OpenAL32/Include/alu.h
+++ b/OpenAL32/Include/alu.h
@@ -64,6 +64,9 @@ typedef struct DirectParams {
     ALboolean Moving;
     /* Stepping counter for gain/coefficient fading. */
     ALuint Counter;
+    /* Last direction (relative to listener) and gain of a moving source. */
+    ALfloat LastDir[3];
+    ALfloat LastGain;
 
     struct {
         enum ActiveFilters ActiveType;
@@ -75,8 +78,6 @@ typedef struct DirectParams {
         HrtfParams Params[MAX_INPUT_CHANNELS];
         HrtfState State[MAX_INPUT_CHANNELS];
         ALuint IrSize;
-        ALfloat Gain;
-        ALfloat Dir[3];
     } Hrtf;
     MixGains Gains[MAX_INPUT_CHANNELS][MAX_OUTPUT_CHANNELS];
 } DirectParams;
-- 
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