From 1363e044acb52e9e51e2b3dcdc6dbad823ccb06c Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Fri, 6 May 2011 00:38:10 -0700
Subject: Remove the head_dampen option Now that HRTF is properly supported,
 it's not needed

---
 Alc/ALc.c                 | 12 ------------
 Alc/ALu.c                 | 14 --------------
 OpenAL32/Include/alMain.h |  3 ---
 alsoftrc.sample           |  8 --------
 4 files changed, 37 deletions(-)

diff --git a/Alc/ALc.c b/Alc/ALc.c
index 401441b6..84478ada 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -1217,14 +1217,6 @@ static ALCboolean UpdateDeviceParams(ALCdevice *device, const ALCint *attrList)
         device->Bs2b = NULL;
     }
 
-    device->HeadDampen = 0.0f;
-    if(!(device->Flags&DEVICE_USE_HRTF) && ChannelsFromDevFmt(device->FmtChans) <= 2)
-    {
-        device->HeadDampen = GetConfigValueFloat(NULL, "head_dampen", DEFAULT_HEAD_DAMPEN);
-        device->HeadDampen = __min(device->HeadDampen, 1.0f);
-        device->HeadDampen = __max(device->HeadDampen, 0.0f);
-    }
-
     return ALC_TRUE;
 }
 
@@ -2354,8 +2346,6 @@ ALC_API ALCdevice* ALC_APIENTRY alcOpenDevice(const ALCchar *deviceName)
     if(GetConfigValueBool(NULL, "stereodup", AL_TRUE))
         device->Flags |= DEVICE_DUPLICATE_STEREO;
 
-    device->HeadDampen = 0.0f;
-
     // Find a playback device to open
     SuspendContext(NULL);
     for(i = 0;BackendList[i].Init;i++)
@@ -2531,8 +2521,6 @@ ALC_API ALCdevice* ALC_APIENTRY alcLoopbackOpenDeviceSOFT(void)
     if(GetConfigValueBool(NULL, "stereodup", AL_TRUE))
         device->Flags |= DEVICE_DUPLICATE_STEREO;
 
-    device->HeadDampen = 0.0f;
-
     // Open the "backend"
     SuspendContext(NULL);
     device->Funcs = &BackendLoopback.Funcs;
diff --git a/Alc/ALu.c b/Alc/ALu.c
index 5657da22..456f9de8 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -666,20 +666,6 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
         ConeHF = 1.0f;
     }
 
-    // Apply some high-frequency attenuation for sources behind the listener
-    // NOTE: This should be aluDotproduct({0,0,-1}, ListenerToSource), however
-    // that is equivalent to aluDotproduct({0,0,1}, SourceToListener), which is
-    // the same as SourceToListener[2]
-    Angle = aluAcos(SourceToListener[2]) * 180.0f/M_PI;
-    // Sources within the minimum distance attenuate less
-    if(OrigDist < MinDist)
-        Angle *= OrigDist/MinDist;
-    if(Angle > 90.0f)
-    {
-        ALfloat scale = (Angle-90.0f) / (180.1f-90.0f); // .1 to account for fp errors
-        ConeHF *= 1.0f - (Device->HeadDampen*scale);
-    }
-
     DryGain *= ConeVolume;
     if(ALSource->DryGainHFAuto)
         DryGainHF *= ConeHF;
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 1eb8cfe0..bb8784b7 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -480,9 +480,6 @@ struct ALCdevice_struct
     struct bs2b *Bs2b;
     ALCint       Bs2bLevel;
 
-    // Simulated dampening from head occlusion
-    ALfloat      HeadDampen;
-
     // Device flags
     ALuint       Flags;
 
diff --git a/alsoftrc.sample b/alsoftrc.sample
index 02520c68..87ac2198 100644
--- a/alsoftrc.sample
+++ b/alsoftrc.sample
@@ -55,14 +55,6 @@
 #  stereo modes.
 #cf_level = 0
 
-## head_dampen:
-#  Sets the amount of dampening on sounds emanating from behind the listener.
-#  This is used to simulate the natural occlusion of the head, which is
-#  typically missing with mono and stereo output, and as such, only works on
-#  mono and stereo output modes. Valid values range from 0 to 1 (inclusive),
-#  and higher values provide a stronger effect.
-#head_dampen = 0.25
-
 ## frequency:
 #  Sets the output frequency.
 #frequency = 44100
-- 
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