From 53572da7de8d2cf22ed996dec4b992ca378f371c Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Wed, 28 Sep 2011 22:02:36 -0700
Subject: [PATCH] Set toward-zero rounding when updating in alDeferUpdatesSOFT

---
 OpenAL32/alState.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/OpenAL32/alState.c b/OpenAL32/alState.c
index 3920adf..1cb5268 100644
--- a/OpenAL32/alState.c
+++ b/OpenAL32/alState.c
@@ -585,8 +585,19 @@ AL_API ALvoid AL_APIENTRY alDeferUpdatesSOFT(void)
         ALboolean UpdateSources;
         ALsource **src, **src_end;
         ALeffectslot **slot, **slot_end;
+        int fpuState;
 
         LockContext(Context);
+#if defined(HAVE_FESETROUND)
+        fpuState = fegetround();
+        fesetround(FE_TOWARDZERO);
+#elif defined(HAVE__CONTROLFP)
+        fpuState = _controlfp(0, 0);
+        (void)_controlfp(_RC_CHOP, _MCW_RC);
+#else
+        (void)fpuState;
+#endif
+
         Context->DeferUpdates = AL_TRUE;
 
         /* Make sure all pending updates are performed */
@@ -619,6 +630,11 @@ AL_API ALvoid AL_APIENTRY alDeferUpdatesSOFT(void)
         }
 
         UnlockContext(Context);
+#if defined(HAVE_FESETROUND)
+        fesetround(fpuState);
+#elif defined(HAVE__CONTROLFP)
+        _controlfp(fpuState, _MCW_RC);
+#endif
     }
 
     ALCcontext_DecRef(Context);