Redo advanced atmo shader integration with SL.

2 files changed, 114 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoF.glsl b/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoF.glsl
new file mode 100644
index 0000000000..c71eaf4b13
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoF.glsl
@@ -0,0 +1,71 @@
+/** 
+ * @file advancedAtmoF.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_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+in vec3 view_dir;
+
+uniform vec3 cameraPosLocal;
+uniform vec3 sun_direction;
+uniform vec2 sun_size;
+
+uniform sampler2D cloud_noise_texture;
+uniform sampler2D transmittance_texture;
+uniform sampler3D scattering_texture;
+uniform sampler3D mie_scattering_texture;
+
+vec3 GetSolarLuminance();
+vec3 GetSkyLuminance(vec3 camPos, vec3 view_dir, float shadow_length, vec3 sun_dir, out vec3 transmittance);
+vec3 GetSkyLuminanceToPoint(vec3 camPos, vec3 pos, float shadow_length, vec3 sun_dir, out vec3 transmittance);
+vec3 GetSunAndSkyIlluminance(vec3 pos, vec3 norm, vec3 sun_dir, out vec3 sky_irradiance);
+
+void main()
+{
+    vec3 view_direction = normalize(view_dir);
+
+    vec3 camPos = cameraPosLocal;
+    vec3 transmittance;
+    vec3 radiance = GetSkyLuminance(camPos, view_direction, 0.0f, sun_direction, transmittance);
+
+    radiance *= transmittance;
+
+    // If the view ray intersects the Sun, add the Sun radiance.
+    if (dot(view_direction, sun_direction) >= sun_size.y)
+    {
+        radiance = radiance + transmittance * GetSolarLuminance();
+    }
+
+    vec3 color = vec3(1.0) - exp(-radiance);
+    color = pow(color, vec3(1.0 / 2.2));
+
+    frag_color.rgb = color;
+ 
+    frag_color.a = 1.0;
+}
+
diff --git a/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoV.glsl b/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoV.glsl
new file mode 100644
index 0000000000..52a7595379
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class3/windlight/advancedAtmoV.glsl
@@ -0,0 +1,43 @@
+/** 
+ * @file advancedAtmoV.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
+ * $/LicenseInfo$
+ */
+ 
+uniform mat4 modelview_projection_matrix;
+
+ATTRIBUTE vec3 position;
+
+// Inputs
+uniform vec3 camPosLocal;
+
+out vec3 view_dir;
+
+void main()
+{
+	// World / view / projection
+	gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
+
+	// this will be normalized in the frag shader...
+	view_dir = position.xyz - camPosLocal.xyz; 
+}
+