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diff --git a/indra/newview/app_settings/shaders/class1/interface/downsampleDepthRectF.glsl b/indra/newview/app_settings/shaders/class1/interface/downsampleDepthRectF.glsl
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+++ b/indra/newview/app_settings/shaders/class1/interface/downsampleDepthRectF.glsl
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+/**
+ * @file debugF.glsl
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2011, 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
+
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2DRect depthMap;
+
+VARYING vec2 tc0;
+VARYING vec2 tc1;
+VARYING vec2 tc2;
+VARYING vec2 tc3;
+VARYING vec2 tc4;
+VARYING vec2 tc5;
+VARYING vec2 tc6;
+VARYING vec2 tc7;
+VARYING vec2 tc8;
+
+void main()
+{
+ vec4 depth1 =
+ vec4(texture2DRect(depthMap, tc0).r,
+ texture2DRect(depthMap, tc1).r,
+ texture2DRect(depthMap, tc2).r,
+ texture2DRect(depthMap, tc3).r);
+
+ vec4 depth2 =
+ vec4(texture2DRect(depthMap, tc4).r,
+ texture2DRect(depthMap, tc5).r,
+ texture2DRect(depthMap, tc6).r,
+ texture2DRect(depthMap, tc7).r);
+
+ depth1 = min(depth1, depth2);
+ float depth = min(depth1.x, depth1.y);
+ depth = min(depth, depth1.z);
+ depth = min(depth, depth1.w);
+ depth = min(depth, texture2DRect(depthMap, tc8).r);
+
+ gl_FragDepth = depth;
+}