From aaff188b3bcc9d6b73e51bda577d7b45ffa7ef73 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Thu, 25 Nov 2010 13:49:51 -0800
Subject: [PATCH] Remove the cosine resampler It's too slow when auxiliary
 sends are being used.

---
 Alc/mixer.c                 | 44 -------------------------------------
 OpenAL32/Include/alSource.h |  1 -
 alsoftrc.sample             |  1 -
 3 files changed, 46 deletions(-)

diff --git a/Alc/mixer.c b/Alc/mixer.c
index 596db64c..5d7d828d 100644
--- a/Alc/mixer.c
+++ b/Alc/mixer.c
@@ -48,25 +48,16 @@ static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALint frac)
     val1 += ((val2-val1) * (frac * (1.0/(1<<FRACTIONBITS))));
     return val1;
 }
-static __inline ALdouble cos_lerp(ALdouble val1, ALdouble val2, ALint frac)
-{
-    val1 += ((val2-val1) * ((1.0-cos(frac * (1.0/(1<<FRACTIONBITS)) * M_PI)) * 0.5));
-    return val1;
-}
 
 static __inline ALdouble point16(ALdouble val1, ALdouble val2, ALint frac)
 { return point(val1, val2, frac) / 32767.0; }
 static __inline ALdouble lerp16(ALdouble val1, ALdouble val2, ALint frac)
 { return lerp(val1, val2, frac) / 32767.0; }
-static __inline ALdouble cos_lerp16(ALdouble val1, ALdouble val2, ALint frac)
-{ return cos_lerp(val1, val2, frac) / 32767.0; }
 
 static __inline ALdouble point8(ALdouble val1, ALdouble val2, ALint frac)
 { return (point(val1, val2, frac)-128.0) / 127.0; }
 static __inline ALdouble lerp8(ALdouble val1, ALdouble val2, ALint frac)
 { return (lerp(val1, val2, frac)-128.0) / 127.0; }
-static __inline ALdouble cos_lerp8(ALdouble val1, ALdouble val2, ALint frac)
-{ return (cos_lerp(val1, val2, frac)-128.0) / 127.0; }
 
 
 
@@ -204,15 +195,12 @@ static void Mix_##T##_Mono_##sampler(ALsource *Source, ALCdevice *Device,     \
 
 DECL_MIX_MONO(ALfloat, point)
 DECL_MIX_MONO(ALfloat, lerp)
-DECL_MIX_MONO(ALfloat, cos_lerp)
 
 DECL_MIX_MONO(ALshort, point16)
 DECL_MIX_MONO(ALshort, lerp16)
-DECL_MIX_MONO(ALshort, cos_lerp16)
 
 DECL_MIX_MONO(ALubyte, point8)
 DECL_MIX_MONO(ALubyte, lerp8)
-DECL_MIX_MONO(ALubyte, cos_lerp8)
 
 
 #define DECL_MIX_STEREO(T,sampler)                                            \
@@ -361,15 +349,12 @@ static void Mix_##T##_Stereo_##sampler(ALsource *Source, ALCdevice *Device,   \
 
 DECL_MIX_STEREO(ALfloat, point)
 DECL_MIX_STEREO(ALfloat, lerp)
-DECL_MIX_STEREO(ALfloat, cos_lerp)
 
 DECL_MIX_STEREO(ALshort, point16)
 DECL_MIX_STEREO(ALshort, lerp16)
-DECL_MIX_STEREO(ALshort, cos_lerp16)
 
 DECL_MIX_STEREO(ALubyte, point8)
 DECL_MIX_STEREO(ALubyte, lerp8)
-DECL_MIX_STEREO(ALubyte, cos_lerp8)
 
 
 #define DECL_MIX_MC(T,chans,sampler)                                          \
@@ -509,15 +494,12 @@ static const Channel QuadChans[] = { FRONT_LEFT, FRONT_RIGHT,
                                      BACK_LEFT,  BACK_RIGHT };
 DECL_MIX_MC(ALfloat, QuadChans, point)
 DECL_MIX_MC(ALfloat, QuadChans, lerp)
-DECL_MIX_MC(ALfloat, QuadChans, cos_lerp)
 
 DECL_MIX_MC(ALshort, QuadChans, point16)
 DECL_MIX_MC(ALshort, QuadChans, lerp16)
-DECL_MIX_MC(ALshort, QuadChans, cos_lerp16)
 
 DECL_MIX_MC(ALubyte, QuadChans, point8)
 DECL_MIX_MC(ALubyte, QuadChans, lerp8)
-DECL_MIX_MC(ALubyte, QuadChans, cos_lerp8)
 
 
 static const Channel X51Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
@@ -525,15 +507,12 @@ static const Channel X51Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
                                     BACK_LEFT,  BACK_RIGHT };
 DECL_MIX_MC(ALfloat, X51Chans, point)
 DECL_MIX_MC(ALfloat, X51Chans, lerp)
-DECL_MIX_MC(ALfloat, X51Chans, cos_lerp)
 
 DECL_MIX_MC(ALshort, X51Chans, point16)
 DECL_MIX_MC(ALshort, X51Chans, lerp16)
-DECL_MIX_MC(ALshort, X51Chans, cos_lerp16)
 
 DECL_MIX_MC(ALubyte, X51Chans, point8)
 DECL_MIX_MC(ALubyte, X51Chans, lerp8)
-DECL_MIX_MC(ALubyte, X51Chans, cos_lerp8)
 
 
 static const Channel X61Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
@@ -542,15 +521,12 @@ static const Channel X61Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
                                     SIDE_LEFT,    SIDE_RIGHT };
 DECL_MIX_MC(ALfloat, X61Chans, point)
 DECL_MIX_MC(ALfloat, X61Chans, lerp)
-DECL_MIX_MC(ALfloat, X61Chans, cos_lerp)
 
 DECL_MIX_MC(ALshort, X61Chans, point16)
 DECL_MIX_MC(ALshort, X61Chans, lerp16)
-DECL_MIX_MC(ALshort, X61Chans, cos_lerp16)
 
 DECL_MIX_MC(ALubyte, X61Chans, point8)
 DECL_MIX_MC(ALubyte, X61Chans, lerp8)
-DECL_MIX_MC(ALubyte, X61Chans, cos_lerp8)
 
 
 static const Channel X71Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
@@ -559,15 +535,12 @@ static const Channel X71Chans[] = { FRONT_LEFT,   FRONT_RIGHT,
                                     SIDE_LEFT,    SIDE_RIGHT };
 DECL_MIX_MC(ALfloat, X71Chans, point)
 DECL_MIX_MC(ALfloat, X71Chans, lerp)
-DECL_MIX_MC(ALfloat, X71Chans, cos_lerp)
 
 DECL_MIX_MC(ALshort, X71Chans, point16)
 DECL_MIX_MC(ALshort, X71Chans, lerp16)
-DECL_MIX_MC(ALshort, X71Chans, cos_lerp16)
 
 DECL_MIX_MC(ALubyte, X71Chans, point8)
 DECL_MIX_MC(ALubyte, X71Chans, lerp8)
-DECL_MIX_MC(ALubyte, X71Chans, cos_lerp8)
 
 
 #define DECL_MIX(T, sampler)                                                  \
@@ -612,15 +585,12 @@ static void Mix_##T##_##sampler(ALsource *Source, ALCdevice *Device, ALuint Chan
 
 DECL_MIX(ALfloat, point)
 DECL_MIX(ALfloat, lerp)
-DECL_MIX(ALfloat, cos_lerp)
 
 DECL_MIX(ALshort, point16)
 DECL_MIX(ALshort, lerp16)
-DECL_MIX(ALshort, cos_lerp16)
 
 DECL_MIX(ALubyte, point8)
 DECL_MIX(ALubyte, lerp8)
-DECL_MIX(ALubyte, cos_lerp8)
 
 
 /* Stack data size can be whatever. Larger values need more stack, while
@@ -827,20 +797,6 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo)
                                       SrcData, &DataPosInt, &DataPosFrac,
                                       j, SamplesToDo, BufferSize);
                 break;
-            case COSINE_RESAMPLER:
-                if(Bytes == 4)
-                    Mix_ALfloat_cos_lerp(Source, Device, Channels,
-                                         SrcData, &DataPosInt, &DataPosFrac,
-                                         j, SamplesToDo, BufferSize);
-                else if(Bytes == 2)
-                    Mix_ALshort_cos_lerp16(Source, Device, Channels,
-                                           SrcData, &DataPosInt, &DataPosFrac,
-                                           j, SamplesToDo, BufferSize);
-                else if(Bytes == 1)
-                    Mix_ALubyte_cos_lerp8(Source, Device, Channels,
-                                          SrcData, &DataPosInt, &DataPosFrac,
-                                          j, SamplesToDo, BufferSize);
-                break;
             case RESAMPLER_MIN:
             case RESAMPLER_MAX:
             break;
diff --git a/OpenAL32/Include/alSource.h b/OpenAL32/Include/alSource.h
index 40673c00..54a3470e 100644
--- a/OpenAL32/Include/alSource.h
+++ b/OpenAL32/Include/alSource.h
@@ -14,7 +14,6 @@ extern "C" {
 typedef enum {
     POINT_RESAMPLER = 0,
     LINEAR_RESAMPLER,
-    COSINE_RESAMPLER,
 
     RESAMPLER_MAX,
     RESAMPLER_MIN = -1,
diff --git a/alsoftrc.sample b/alsoftrc.sample
index d407c952..dacaf0d7 100644
--- a/alsoftrc.sample
+++ b/alsoftrc.sample
@@ -64,7 +64,6 @@
 #  Selects the resampler used when mixing sources. Valid values are:
 #  0 - None (nearest sample, no interpolation)
 #  1 - Linear (extrapolates samples using a linear slope between samples)
-#  2 - Cosine (extrapolates using a (co)sine slope)
 #  Specifying other values will result in using the default (linear).
 #resampler = 1