From 2ceea21f763f4d5639dea202900603ad49a2d6e4 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 24 Sep 2012 15:33:44 -0700
Subject: Avoid mixing silence to output

"Silence" being less than -100dB.
---
 Alc/mixer_sse.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'Alc/mixer_sse.c')

diff --git a/Alc/mixer_sse.c b/Alc/mixer_sse.c
index d366ca8a..d2ea7439 100644
--- a/Alc/mixer_sse.c
+++ b/Alc/mixer_sse.c
@@ -156,7 +156,12 @@ void MixDirect_SSE(ALsource *Source, ALCdevice *Device, DirectParams *params,
     }
     for(c = 0;c < MaxChannels;c++)
     {
-        const __m128 gain = _mm_set1_ps(DrySend[c]);
+        __m128 gain;
+
+        if(DrySend[c] < 0.00001f)
+            continue;
+
+        gain = _mm_set1_ps(DrySend[c]);
         for(pos = 0;pos < BufferSize-3;pos += 4)
         {
             const __m128 val4 = _mm_load_ps(&data[pos]);
@@ -165,15 +170,20 @@ void MixDirect_SSE(ALsource *Source, ALCdevice *Device, DirectParams *params,
             _mm_store_ps(&DryBuffer[c][OutPos+pos], dry4);
         }
     }
+    pos = BufferSize&~3;
     if(pos < BufferSize)
     {
         ALuint oldpos = pos;
         for(c = 0;c < MaxChannels;c++)
         {
+            if(DrySend[c] < 0.00001f)
+                continue;
+
             pos = oldpos;
             for(;pos < BufferSize;pos++)
                 DryBuffer[c][OutPos+pos] += data[pos]*DrySend[c];
         }
+        pos = BufferSize;
     }
     if(OutPos+pos == SamplesToDo)
     {
-- 
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