From ced00c47328f69a5426e6c69dce59c8f29856c51 Mon Sep 17 00:00:00 2001
From: Xiaohong Bao <bao@lindenlab.com>
Date: Tue, 20 Nov 2012 21:37:53 -0700
Subject: more for SH-3352: Create pixel shader to accumulate frame-to-frame
 absolute pixel differences

---
 .../shaders/class1/interface/twotexturecompareF.glsl        | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl b/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl
index ec5f18e9bd..92aa7602a4 100644
--- a/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl
+++ b/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl
@@ -38,5 +38,18 @@ VARYING vec2 vary_texcoord1;
 void main() 
 {
 	frag_color = texture2D(tex0, vary_texcoord0.xy) - texture2D(tex1, vary_texcoord0.xy);
+	
+	if(frag_color[0] < 0.f)
+	{
+		frag_color[0] = -frag_color[0];
+	}
+	if(frag_color[1] < 0.f)
+	{
+		frag_color[1] = -frag_color[1];
+	}
+	if(frag_color[2] < 0.f)
+	{
+		frag_color[2] = -frag_color[2];
+	}
 	frag_color[3] = 1.f;
 }
-- 
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