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+/**
+ * @file class3/deferred/skyF.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
+ * $/LicenseInfo$
+ */
+
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_data[3];
+#else
+#define frag_data gl_FragData
+#endif
+
+VARYING vec2 vary_frag;
+
+uniform vec3 camPosLocal;
+uniform vec3 sun_dir;
+uniform float sun_size;
+uniform float far_z;
+uniform mat4 inv_proj;
+uniform mat4 inv_modelview;
+
+uniform sampler2D transmittance_texture;
+uniform sampler3D scattering_texture;
+uniform sampler3D single_mie_scattering_texture;
+uniform sampler2D irradiance_texture;
+uniform sampler2D rainbow_map;
+uniform sampler2D halo_map;
+uniform vec4 gamma;
+
+uniform float moisture_level;
+uniform float droplet_radius;
+uniform float ice_level;
+
+vec3 GetSolarLuminance();
+vec3 GetSkyLuminance(vec3 camPos, vec3 view_dir, float shadow_length, vec3 dir, out vec3 transmittance);
+vec3 GetSkyLuminanceToPoint(vec3 camPos, vec3 pos, float shadow_length, vec3 dir, out vec3 transmittance);
+
+vec3 ColorFromRadiance(vec3 radiance);
+vec3 rainbow(float d)
+{
+ float rad = (droplet_radius - 5.0f) / 1024.0f;
+ return pow(texture2D(rainbow_map, vec2(rad, d)).rgb, vec3(1.8)) * moisture_level;
+}
+
+vec3 halo22(float d)
+{
+ float v = sqrt(max(0, 1 - (d*d)));
+ return texture2D(halo_map, vec2(0, v)).rgb * ice_level;
+}
+
+void main()
+{
+ vec3 pos = vec3((vary_frag * 2.0) - vec2(1.0, 1.0f), 1.0);
+ vec4 view_pos = (inv_proj * vec4(pos, 1.0f));
+
+ view_pos /= view_pos.w;
+
+ vec3 view_ray = (inv_modelview * vec4(view_pos.xyz, 0.0f)).xyz + camPosLocal;
+
+ vec3 view_direction = normalize(view_ray);
+ vec3 sun_direction = normalize(sun_dir);
+ vec3 earth_center = vec3(0, 0, -6360.0f);
+ vec3 camPos = (camPosLocal / 1000.0f) - earth_center;
+
+ vec3 transmittance;
+ vec3 radiance_sun = GetSkyLuminance(camPos, view_direction, 0.0f, sun_direction, transmittance);
+ vec3 solar_luminance = GetSolarLuminance();
+
+ // If the view ray intersects the Sun, add the Sun radiance.
+ float s = dot(view_direction, sun_direction);
+
+ // cheesy solar disc...
+ if (s >= (sun_size * 0.999))
+ {
+ radiance_sun += pow(smoothstep(0.0, 1.3, (s - (sun_size * 0.9))), 2.0) * solar_luminance * transmittance;
+ }
+ s = smoothstep(0.9, 1.0, s) * 16.0f;
+
+ vec3 color = ColorFromRadiance(radiance_sun);
+
+ float optic_d = dot(view_direction, sun_direction);
+ vec3 halo_22 = halo22(optic_d);
+
+ color.rgb += rainbow(optic_d) * optic_d;
+ color.rgb += halo_22;
+
+ color = pow(color, vec3(1.0/2.2));
+
+ frag_data[0] = vec4(color, 1.0 + s);
+ frag_data[1] = vec4(0.0);
+ frag_data[2] = vec4(0.0, 1.0, 0.0, 1.0);
+}
+