1 files changed, 58 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl b/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl
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index 0000000000..6eeb2596b2
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+++ b/indra/newview/app_settings/shaders/class1/interface/twotexturecompareF.glsl
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+/** 
+ * @file twotexturecompareF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2007, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+uniform sampler2D dither_tex;
+uniform float dither_scale;
+uniform float dither_scale_s;
+uniform float dither_scale_t;
+
+VARYING vec2 vary_texcoord0;
+VARYING vec2 vary_texcoord1;
+
+void main() 
+{
+	frag_color = abs(texture2D(tex0, vary_texcoord0.xy) - texture2D(tex1, vary_texcoord0.xy));
+
+	vec2 dither_coord;
+	dither_coord[0] = vary_texcoord0[0] * dither_scale_s;
+	dither_coord[1] = vary_texcoord0[1] * dither_scale_t;
+	vec4 dither_vec = texture(dither_tex, dither_coord.xy);
+
+	for(int i = 0; i < 3; i++)
+	{
+		if(frag_color[i] < dither_vec[i] * dither_scale)
+		{
+			frag_color[i] = 0.f;
+		}
+	}
+}