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diff --git a/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl b/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl
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+++ b/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl
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+/** 
+ * @file moonF.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2005, 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
+ * $/LicenseInfo$
+ */
+ 
+#extension GL_ARB_texture_rectangle : enable
+
+/*[EXTRA_CODE_HERE]*/
+
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_data[3];
+#else
+#define frag_data gl_FragData
+#endif
+
+vec3 fullbrightAtmosTransport(vec3 light);
+vec3 fullbrightScaleSoftClip(vec3 light);
+
+uniform vec4 color;
+uniform vec4 sunlight_color;
+uniform vec3 lumWeights;
+uniform float minLuminance;
+uniform sampler2D diffuseMap;
+uniform sampler2D altDiffuseMap;
+uniform float blend_factor; // interp factor between moon A/B
+VARYING vec2 vary_texcoord0;
+
+void main() 
+{
+	vec4 moonA = texture2D(diffuseMap, vary_texcoord0.xy);
+	vec4 moonB = texture2D(altDiffuseMap, vary_texcoord0.xy);
+    vec4 c     = mix(moonB, moonA, blend_factor);
+
+	c.rgb = pow(c.rgb, vec3(0.7f));
+	c.rgb = fullbrightAtmosTransport(c.rgb);
+    c.rgb = fullbrightScaleSoftClip(c.rgb);
+
+    // mix factor which blends when sunlight is brighter
+    // and shows true moon color at night
+    vec3 luma_weights = vec3(0.1, 0.3, 0.0);
+    float mix = 1.0f - dot(sunlight_color.rgb, luma_weights);
+	frag_data[0] = vec4(c.rgb, mix * c.a);
+	frag_data[1] = vec4(0.0);
+	frag_data[2] = vec4(0.0f);
+}
+