From 893a1bedbc0048e159e4471ac21f03cfee3a72ea Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Tue, 4 Dec 2012 05:30:06 -0800
Subject: [PATCH] Use +/-90 degrees for stereo sources with non-HRTF stereo
 output.

---
 Alc/ALu.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 2ce2685b..282053c7 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -333,7 +333,15 @@ ALvoid CalcNonAttnSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
 
     case FmtStereo:
         if(!(Device->Flags&DEVICE_WIDE_STEREO))
-            chans = StereoMap;
+        {
+            /* HACK: Place the stereo channels at +/-90 degrees when using non-
+             * HRTF stereo output. This helps reduce the "monoization" caused
+             * by them panning towards the center. */
+            if(Device->FmtChans == DevFmtStereo && !Device->Hrtf)
+                chans = StereoWideMap;
+            else
+                chans = StereoMap;
+        }
         else
         {
             chans = StereoWideMap;
-- 
2.11.4.GIT