Merge branch 'master' into DRTVWR-507-maint

17 files changed, 692 insertions, 36 deletions

diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsF.glsl
index aacc503e13..4e0618e276 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericsF.glsl
+ * @file class1\windlight\atmosphericsF.glsl
  *
  * $LicenseInfo:firstyear=2005&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -23,11 +23,26 @@
  * $/LicenseInfo$
  */
  
+vec3 atmosFragAmbient(vec3 light, vec3 sunlit)
+{
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
+}
 
+vec3 atmosFragLighting(vec3 light, vec3 additive, vec3 atten)
+{
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
+}
+
+vec3 atmosFragAffectDirectionalLight(float light, vec3 sunlit)
+{
+   return light * sunlit;
+}
 
 vec3 atmosLighting(vec3 light)
 {
-	/* stub function for fallback compatibility on class1 hardware */
-	return light;
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
new file mode 100644
index 0000000000..dcb02bd1c1
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl
@@ -0,0 +1,154 @@
+/** 
+ * @file class1\windlight\atmosphericsFuncs.glsl
+ *
+ * $LicenseInfo:firstyear=2005&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2019, 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 vec4 lightnorm;
+uniform vec4 sunlight_color;
+uniform vec4 moonlight_color;
+uniform int sun_up_factor;
+uniform vec4 ambient_color;
+uniform vec4 blue_horizon;
+uniform vec4 blue_density;
+uniform float haze_horizon;
+uniform float haze_density;
+uniform float cloud_shadow;
+uniform float density_multiplier;
+uniform float distance_multiplier;
+uniform float max_y;
+uniform vec4 glow;
+uniform float scene_light_strength;
+uniform mat3 ssao_effect_mat;
+uniform int no_atmo;
+uniform float sun_moon_glow_factor;
+
+float getAmbientClamp()
+{
+    return 1.0f;
+}
+
+
+void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, out vec3 sunlit, out vec3 amblit, out vec3 additive, out vec3 atten, bool use_ao) {
+
+    vec3 P = inPositionEye;
+   
+    //(TERRAIN) limit altitude
+    if (P.y > max_y) P *= (max_y / P.y);
+    if (P.y < -max_y) P *= (-max_y / P.y); 
+
+    vec3 tmpLightnorm = lightnorm.xyz;
+
+    vec3 Pn = normalize(P);
+    float Plen = length(P);
+
+    vec4 temp1 = vec4(0);
+    vec3 temp2 = vec3(0);
+    vec4 blue_weight;
+    vec4 haze_weight;
+    vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
+    vec4 light_atten;
+
+    float dens_mul = density_multiplier;
+    float dist_mul = distance_multiplier;
+
+    //sunlight attenuation effect (hue and brightness) due to atmosphere
+    //this is used later for sunlight modulation at various altitudes
+    light_atten = (blue_density + vec4(haze_density * 0.25)) * (dens_mul * max_y);
+        //I had thought blue_density and haze_density should have equal weighting,
+        //but attenuation due to haze_density tends to seem too strong
+
+    temp1 = blue_density + vec4(haze_density);
+    blue_weight = blue_density / temp1;
+    haze_weight = vec4(haze_density) / temp1;
+
+    //(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
+    temp2.y = max(0.0, tmpLightnorm.y);
+    if (abs(temp2.y) > 0.000001f)
+    {
+        temp2.y = 1. / abs(temp2.y);
+    }
+    temp2.y = max(0.0000001f, temp2.y);
+    sunlight *= exp(-light_atten * temp2.y);
+
+    // main atmospheric scattering line integral
+    temp2.z = Plen * dens_mul;
+
+    // Transparency (-> temp1)
+    // ATI Bugfix -- can't store temp1*temp2.z*dist_mul in a variable because the ati
+    // compiler gets confused.
+    temp1 = exp(-temp1 * temp2.z * dist_mul);
+
+    //final atmosphere attenuation factor
+    atten = temp1.rgb;
+    
+    //compute haze glow
+    //(can use temp2.x as temp because we haven't used it yet)
+    temp2.x = dot(Pn, tmpLightnorm.xyz);
+
+    // dampen sun additive contrib when not facing it...
+    if (length(light_dir) > 0.01)
+    {
+        temp2.x *= max(0.0f, dot(light_dir, Pn));
+    }
+    temp2.x = 1. - temp2.x;
+        //temp2.x is 0 at the sun and increases away from sun
+    temp2.x = max(temp2.x, .001);    //was glow.y
+        //set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+    temp2.x *= glow.x;
+        //higher glow.x gives dimmer glow (because next step is 1 / "angle")
+    temp2.x = pow(temp2.x, glow.z);
+        //glow.z should be negative, so we're doing a sort of (1 / "angle") function
+
+    //add "minimum anti-solar illumination"
+    temp2.x += .25;
+
+    temp2.x *= sun_moon_glow_factor;
+ 
+    vec4 amb_color = ambient_color; 
+    
+    //increase ambient when there are more clouds
+    vec4 tmpAmbient = amb_color + (vec4(1.) - amb_color) * cloud_shadow * 0.5;
+    
+    /*  decrease value and saturation (that in HSV, not HSL) for occluded areas
+     * // for HSV color/geometry used here, see http://gimp-savvy.com/BOOK/index.html?node52.html
+     * // The following line of code performs the equivalent of:
+     * float ambAlpha = tmpAmbient.a;
+     * float ambValue = dot(vec3(tmpAmbient), vec3(0.577)); // projection onto <1/rt(3), 1/rt(3), 1/rt(3)>, the neutral white-black axis
+     * vec3 ambHueSat = vec3(tmpAmbient) - vec3(ambValue);
+     * tmpAmbient = vec4(RenderSSAOEffect.valueFactor * vec3(ambValue) + RenderSSAOEffect.saturationFactor *(1.0 - ambFactor) * ambHueSat, ambAlpha);
+     */
+    if (use_ao)
+    {
+        tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a);
+    }
+
+    //haze color
+        additive =
+        vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow) + tmpAmbient)
+      + (haze_horizon * haze_weight) * (sunlight*(1.-cloud_shadow) * temp2.x
+          + tmpAmbient));
+
+    //brightness of surface both sunlight and ambient
+    sunlit = sunlight.rgb * 0.5;
+    amblit = tmpAmbient.rgb * .25;
+    additive *= vec3(1.0 - temp1);
+}
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersF.glsl
new file mode 100644
index 0000000000..206a51db27
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersF.glsl
@@ -0,0 +1,51 @@
+/** 
+ * @file class1\windlight\atmosphericsHelpersF.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 vec4 sunlight_color;
+uniform vec4 light_ambient;
+uniform int no_atmo;
+
+vec3 atmosAmbient()
+{
+    if (no_atmo == 1) return vec3(0.16);
+    return light_ambient.rgb;
+}
+
+vec3 atmosAffectDirectionalLight(float lightIntensity)
+{
+    return sunlight_color.rgb * lightIntensity;
+}
+
+vec3 atmosGetDiffuseSunlightColor()
+{
+    return sunlight_color.rgb;
+}
+
+vec3 scaleDownLight(vec3 light)
+{
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
+}
+
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersV.glsl
index 6ff860362c..c266f9732f 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsHelpersV.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericsHelpersV.glsl 
+ * @file class1\windlight\atmosphericsHelpersV.glsl 
  *
  * $LicenseInfo:firstyear=2005&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -23,33 +23,35 @@
  * $/LicenseInfo$
  */
  
-uniform vec4 sunlight_color_copy;
+uniform vec4 sunlight_color;
 uniform vec4 light_ambient;
+uniform int no_atmo;
 
-vec3 atmosAmbient(vec3 light)
+vec3 atmosAmbient()
 {
-	return light + light_ambient.rgb;
+    if (no_atmo == 1) return vec3(0.66);
+    return light_ambient.rgb;
 }
 
 vec3 atmosAffectDirectionalLight(float lightIntensity)
 {
-	return sunlight_color_copy.rgb * lightIntensity;
+    return sunlight_color.rgb * lightIntensity;
 }
 
 vec3 atmosGetDiffuseSunlightColor()
 {
-	return sunlight_color_copy.rgb;
+    return sunlight_color.rgb;
 }
 
 vec3 scaleDownLight(vec3 light)
 {
-	/* stub function for fallback compatibility on class1 hardware */
-	return light;
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
 }
 
 vec3 scaleUpLight(vec3 light)
 {
-	/* stub function for fallback compatibility on class1 hardware */
-	return light;
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl
index 76d7d5059d..20457ad125 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsV.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericsV.glsl 
+ * @file class1\windlight\atmosphericsV.glsl 
  *
  * $LicenseInfo:firstyear=2005&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -29,7 +29,7 @@ void setPositionEye(vec3 v);
 
 void calcAtmospherics(vec3 inPositionEye)
 {
-	/* stub function for fallback compatibility on class1 hardware */
-	setPositionEye(inPositionEye);
+    /* stub function for fallback compatibility on class1 hardware */
+    setPositionEye(inPositionEye);
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
index 8bdae328bd..a0699affbf 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericVarsF.glsl
+ * @file class1\windlight\atmosphericVarsF.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
index 8ec9ae617c..bd1d150fc8 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericVarsV.glsl
+ * @file class1\windlight\atmosphericVarsV.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
index 636d4af006..5dc086ab1e 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericVarsWaterF.glsl
+ * @file class1\windlight\atmosphericVarsWaterF.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
index 8afcc20f6d..e59eca265a 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file atmosphericVarsWaterV.glsl
+ * @file class1\windlight\atmosphericVarsWaterV.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
diff --git a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
new file mode 100644
index 0000000000..82fad4db5a
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
@@ -0,0 +1,127 @@
+/** 
+ * @file class1/windlight/cloudShadowF.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
+
+uniform sampler2D diffuseMap;
+
+VARYING vec4 pos;
+VARYING float target_pos_x;
+VARYING float vary_CloudDensity;
+VARYING vec2 vary_texcoord0;
+VARYING vec2 vary_texcoord1;
+VARYING vec2 vary_texcoord2;
+VARYING vec2 vary_texcoord3;
+
+uniform sampler2D cloud_noise_texture;
+uniform sampler2D cloud_noise_texture_next;
+uniform float blend_factor;
+uniform vec4 cloud_pos_density1;
+uniform vec4 cloud_pos_density2;
+uniform vec4 sunlight_color;
+uniform vec4 cloud_color;
+uniform float cloud_shadow;
+uniform float cloud_scale;
+uniform float cloud_variance;
+uniform vec3 camPosLocal;
+uniform vec3 sun_dir;
+uniform float sun_size;
+uniform float far_z;
+
+#if !defined(DEPTH_CLAMP)
+VARYING vec4 post_pos;
+#endif
+
+vec4 cloudNoise(vec2 uv)
+{
+   vec4 a = texture2D(cloud_noise_texture, uv);
+   vec4 b = texture2D(cloud_noise_texture_next, uv);
+   vec4 cloud_noise_sample = mix(a, b, blend_factor);
+   return normalize(cloud_noise_sample);
+}
+
+void main()
+{
+    if (cloud_scale >= 0.0001)
+    {
+        // Set variables
+        vec2 uv1 = vary_texcoord0.xy;
+        vec2 uv2 = vary_texcoord1.xy;
+        vec2 uv3 = vary_texcoord2.xy;
+        float cloudDensity = 2.0 * (cloud_shadow - 0.25);
+    
+        vec2 uv4 = vary_texcoord3.xy;
+    
+        vec2 disturbance  = vec2(cloudNoise(uv1 / 8.0f).x, cloudNoise((uv3 + uv1) / 16.0f).x) * cloud_variance * (1.0f - cloud_scale * 0.25f);
+        vec2 disturbance2 = vec2(cloudNoise((uv1 + uv3) / 4.0f).x, cloudNoise((uv4 + uv2) / 8.0f).x) * cloud_variance * (1.0f - cloud_scale * 0.25f);
+    
+        // Offset texture coords
+        uv1 += cloud_pos_density1.xy + (disturbance * 0.2);    //large texture, visible density
+        uv2 += cloud_pos_density1.xy;   //large texture, self shadow
+        uv3 += cloud_pos_density2.xy;   //small texture, visible density
+        uv4 += cloud_pos_density2.xy;   //small texture, self shadow
+    
+        float density_variance = min(1.0, (disturbance.x* 2.0 + disturbance.y* 2.0 + disturbance2.x + disturbance2.y) * 4.0);
+    
+        cloudDensity *= 1.0 - (density_variance * density_variance);
+    
+        // Compute alpha1, the main cloud opacity
+        float alpha1 = (cloudNoise(uv1).x - 0.5) + (cloudNoise(uv3).x - 0.5) * cloud_pos_density2.z;
+        alpha1 = min(max(alpha1 + cloudDensity, 0.) * 10 * cloud_pos_density1.z, 1.);
+    
+        // And smooth
+        alpha1 = 1. - alpha1 * alpha1;
+        alpha1 = 1. - alpha1 * alpha1;  
+    
+        if (alpha1 < 0.001f)
+        {
+            discard;
+        }
+    
+        // Compute alpha2, for self shadowing effect
+        // (1 - alpha2) will later be used as percentage of incoming sunlight
+        float alpha2 = (cloudNoise(uv2).x - 0.5);
+        alpha2 = min(max(alpha2 + cloudDensity, 0.) * 2.5 * cloud_pos_density1.z, 1.);
+    
+        // And smooth
+        alpha2 = 1. - alpha2;
+        alpha2 = 1. - alpha2 * alpha2;  
+    
+        frag_color = vec4(alpha1, alpha1, alpha1, 1);
+    }
+    else
+    {
+        frag_color = vec4(1);
+    }
+
+#if !defined(DEPTH_CLAMP)
+    gl_FragDepth = max(post_pos.z/post_pos.w*0.5+0.5, 0.0);
+#endif
+
+}
diff --git a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowV.glsl b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowV.glsl
new file mode 100644
index 0000000000..09b6004481
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowV.glsl
@@ -0,0 +1,61 @@
+/** 
+ * @file class1\windlight\cloudShadowV.glsl
+ *
+ * $LicenseInfo:firstyear=2011&license=viewerlgpl$
+ * 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
+ * $/LicenseInfo$
+ */
+
+uniform mat4 texture_matrix0;
+uniform mat4 modelview_projection_matrix;
+uniform float shadow_target_width;
+
+ATTRIBUTE vec3 position;
+ATTRIBUTE vec4 diffuse_color;
+ATTRIBUTE vec2 texcoord0;
+
+#if !defined(DEPTH_CLAMP)
+VARYING float pos_zd2;
+#endif
+
+VARYING vec4 pos;
+VARYING float target_pos_x;
+VARYING vec2 vary_texcoord0;
+
+void passTextureIndex();
+
+void main()
+{
+	//transform vertex
+	vec4 pre_pos = vec4(position.xyz, 1.0);
+	pos = modelview_projection_matrix * pre_pos;
+	target_pos_x = 0.5 * (shadow_target_width - 1.0) * pos.x;
+
+#if !defined(DEPTH_CLAMP)
+	pos_zd2 = pos.z * 0.5;
+	gl_Position = vec4(pos.x, pos.y, pos.w*0.5, pos.w);
+#else
+	gl_Position = pos;
+#endif
+	
+	passTextureIndex();
+
+	vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
+}
diff --git a/indra/newview/app_settings/shaders/class1/windlight/gammaF.glsl b/indra/newview/app_settings/shaders/class1/windlight/gammaF.glsl
index 62f4e51449..fc51e81177 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/gammaF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/gammaF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file gammaF.glsl
+ * @file class1\windlight\gammaF.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -23,17 +23,30 @@
  * $/LicenseInfo$
  */
  
+uniform int no_atmo;
 
-
-uniform vec4 gamma;
+vec3 scaleSoftClipFrag(vec3 light)
+{
+	// For compatibility with lower cards. Do nothing.
+	return light;
+}
 
 /// Soft clips the light with a gamma correction
-vec3 scaleSoftClip(vec3 light) {
-	// For compatibility with lower cards. Do nothing.
+vec3 scaleSoftClip(vec3 light)
+{
+	// For compatibility with lower cards. Do nothing
+	return light;
+}
+
+vec3 fullbrightScaleSoftClipFrag(vec3 light, vec3 additive, vec3 atten)
+{
+	// For compatibility with lower cards. Do nothing
 	return light;
 }
 
-vec3 fullbrightScaleSoftClip(vec3 light) {
-	return scaleSoftClip(light);
+vec3 fullbrightScaleSoftClip(vec3 light)
+{
+	// For compatibility with lower cards. Do nothing
+    return light;
 }
 
diff --git a/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
new file mode 100644
index 0000000000..24f3992e32
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
@@ -0,0 +1,64 @@
+/** 
+ * @file class1\wl\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_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform vec4 color;
+uniform vec4 sunlight_color;
+uniform vec4 moonlight_color;
+uniform vec3 lumWeights;
+uniform float moon_brightness;
+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(moonA, moonB, blend_factor);
+
+    // mix factor which blends when sunlight is brighter
+    // and shows true moon color at night
+    vec3 luma_weights = vec3(0.3, 0.5, 0.3);
+    float mix = 1.0f - dot(normalize(sunlight_color.rgb), luma_weights);
+
+    vec3 exp = vec3(1.0 - mix * moon_brightness) * 2.0 - 1.0;
+    c.rgb = pow(c.rgb, exp);
+    //c.rgb *= moonlight_color.rgb;
+
+    frag_color = vec4(c.rgb, c.a);
+}
+
diff --git a/indra/newview/app_settings/shaders/class1/windlight/moonV.glsl b/indra/newview/app_settings/shaders/class1/windlight/moonV.glsl
new file mode 100644
index 0000000000..8cd4b2ef47
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/moonV.glsl
@@ -0,0 +1,49 @@
+/** 
+ * @file class1\wl\moonV.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
+ * $/LicenseInfo$
+ */
+
+uniform mat4 texture_matrix0;
+uniform mat4 modelview_matrix;
+uniform mat4 modelview_projection_matrix;
+
+ATTRIBUTE vec3 position;
+ATTRIBUTE vec2 texcoord0;
+
+void calcAtmospherics(vec3 inPositionEye);
+
+VARYING vec2 vary_texcoord0;
+
+void main()
+{
+    //transform vertex
+    vec3 offset = vec3(0, 0, 50);
+    vec4 vert = vec4(position.xyz - offset, 1.0);
+    vec4 pos = (modelview_matrix * vert);
+
+    gl_Position = modelview_projection_matrix*vert;
+    
+    vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
+    
+    calcAtmospherics(pos.xyz);
+}
diff --git a/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl b/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl
new file mode 100644
index 0000000000..b9ae7a0226
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl
@@ -0,0 +1,59 @@
+/** 
+ * @file class1\wl\sunDiscF.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_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+vec3 fullbrightAtmosTransport(vec3 light);
+vec3 fullbrightScaleSoftClip(vec3 light);
+
+uniform sampler2D diffuseMap;
+uniform sampler2D altDiffuseMap;
+uniform float blend_factor; // interp factor between sun A/B
+VARYING vec2 vary_texcoord0;
+VARYING float sun_fade;
+
+void main() 
+{
+    vec4 sunA = texture2D(diffuseMap, vary_texcoord0.xy);
+    vec4 sunB = texture2D(altDiffuseMap, vary_texcoord0.xy);
+    vec4 c     = mix(sunA, sunB, blend_factor);
+
+// SL-9806 stars poke through
+//    c.a *= sun_fade;
+
+    c.rgb = pow(c.rgb, vec3(0.7f));
+    c.rgb = fullbrightAtmosTransport(c.rgb);
+    c.rgb = fullbrightScaleSoftClip(c.rgb);
+    frag_color = c;
+}
+
diff --git a/indra/newview/app_settings/shaders/class1/windlight/sunDiscV.glsl b/indra/newview/app_settings/shaders/class1/windlight/sunDiscV.glsl
new file mode 100644
index 0000000000..6c0e795f6b
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/windlight/sunDiscV.glsl
@@ -0,0 +1,51 @@
+/** 
+ * @file class1\wl\sunDiscV.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
+ * $/LicenseInfo$
+ */
+
+uniform mat4 texture_matrix0;
+uniform mat4 modelview_matrix;
+uniform mat4 modelview_projection_matrix;
+
+ATTRIBUTE vec3 position;
+ATTRIBUTE vec2 texcoord0;
+
+VARYING vec2 vary_texcoord0;
+VARYING float sun_fade;
+
+void calcAtmospherics(vec3 eye_pos);
+
+void main()
+{
+    //transform vertex
+    vec3 offset = vec3(0, 0, 50);
+    vec4 vert = vec4(position.xyz - offset, 1.0);
+    vec4 pos = modelview_projection_matrix*vert;
+
+    sun_fade = smoothstep(0.3, 1.0, (position.z + 50) / 512.0f);
+    gl_Position = pos;
+    
+    calcAtmospherics(pos.xyz);
+
+    vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
+}
diff --git a/indra/newview/app_settings/shaders/class1/windlight/transportF.glsl b/indra/newview/app_settings/shaders/class1/windlight/transportF.glsl
index 7c95ecdb14..a937d9fa99 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/transportF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/transportF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file transportF.glsl
+ * @file class1/windlight/transportF.glsl
  *
  * $LicenseInfo:firstyear=2005&license=viewerlgpl$
  * Second Life Viewer Source Code
@@ -22,25 +22,35 @@
  * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
  * $/LicenseInfo$
  */
- 
 
+uniform int no_atmo;
 
-vec3 atmosTransport(vec3 light)
+vec3 atmosTransportFrag(vec3 light, vec3 additive, vec3 atten)
 {
-	/* stub function for fallback compatibility on class1 hardware */
+    /* stub function for fallback compatibility on class1 hardware */
 	return light;
 }
 
-vec3 fullbrightAtmosTransport(vec3 light)
+vec3 atmosTransport(vec3 light)
 {
 	/* stub function for fallback compatibility on class1 hardware */
-	return light;
+    return light;
+}
+
+vec3 fullbrightAtmosTransportFrag(vec3 light, vec3 additive, vec3 atten)
+{
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
 }
 
+vec3 fullbrightAtmosTransport(vec3 light)
+{
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
+}
 
 vec3 fullbrightShinyAtmosTransport(vec3 light)
 {
-	/* stub function for fallback compatibility on class1 hardware */
-	return light;
+    /* stub function for fallback compatibility on class1 hardware */
+    return light;
 }
-