From 07bff3129adaabb90f09b71fa65c8be0c3ecef5d Mon Sep 17 00:00:00 2001
From: Graham Linden <graham@lindenlab.com>
Date: Wed, 19 Dec 2018 14:59:19 -0800
Subject: Add new shaders for advanced atmo SH env lighting calcs.

---
 .../shaders/class3/deferred/shVisF.glsl            | 73 ++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 indra/newview/app_settings/shaders/class3/deferred/shVisF.glsl

(limited to 'indra/newview/app_settings/shaders/class3/deferred/shVisF.glsl')

diff --git a/indra/newview/app_settings/shaders/class3/deferred/shVisF.glsl b/indra/newview/app_settings/shaders/class3/deferred/shVisF.glsl
new file mode 100644
index 0000000000..c8991f7a18
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class3/deferred/shVisF.glsl
@@ -0,0 +1,73 @@
+/** 
+ * @file class3/deferred/shVisF.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
+
+/////////////////////////////////////////////////////////////////////////
+// Fragment shader for L1 SH debug rendering
+/////////////////////////////////////////////////////////////////////////
+
+uniform sampler2D sh_input_r;
+uniform sampler2D sh_input_g;
+uniform sampler2D sh_input_b;
+
+uniform mat3 inv_modelviewprojection;
+
+VARYING vec4 vary_pos;
+
+void main(void) 
+{
+    vec2 coord = vary_pos.xy + vec2(0.5,0.5);
+
+    coord.x *= (1.6/0.9);
+
+    if (dot(coord, coord) > 0.25)
+    {
+        discard;
+    }
+
+    vec4 n = vec4(coord*2.0, 0.0, 1);
+    //n.y = -n.y;
+    n.z = sqrt(max(1.0-n.x*n.x-n.y*n.y, 0.0));
+    //n.xyz = inv_modelviewprojection * n.xyz;
+
+    vec4 l1tap = vec4(1.0/sqrt(4*3.14159265), sqrt(3)/sqrt(4*3.14159265), sqrt(3)/sqrt(4*3.14159265), sqrt(3)/sqrt(4*3.14159265));
+    vec4 l1r = texture2D(sh_input_r, vec2(0,0));
+    vec4 l1g = texture2D(sh_input_g, vec2(0,0));
+    vec4 l1b = texture2D(sh_input_b, vec2(0,0));
+    vec3 indirect = vec3(
+                      dot(l1r, l1tap * n),
+                      dot(l1g, l1tap * n),
+                      dot(l1b, l1tap * n));
+
+    //indirect = pow(indirect, vec3(0.45));
+    indirect *= 3.0;
+
+	frag_color = vec4(indirect, 1.0);
+}
-- 
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