Merge branch 'master' into DRTVWR-521-maint

# Conflicts:
#	doc/contributions.txt

25 files changed, 283 insertions, 336 deletions

diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 85431c5f84..2ad7815881 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -6597,7 +6597,7 @@
     <key>Value</key>
     <integer>1</integer>
   </map>
-  <key>MemoryFailurePreventionEnabled</key>
+  <key>MemoryFailurePreventionEnabled</key> <!-- deprecated, only used for obsolete-in-2020 Intel 965 Express GPU -->
   <map>
     <key>Comment</key>
     <string>If set, the viewer will quit to avoid crash when memory failure happens</string>
@@ -9124,7 +9124,7 @@
     <key>Type</key>
     <string>F32</string>
     <key>Value</key>
-    <real>0.03</real>
+    <real>0.1</real>
   </map>
   <key>RenderDebugPipeline</key>
     <map>
diff --git a/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl b/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
index b7036e02cf..8e0a001403 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
@@ -1,24 +1,24 @@
-/**
+/** 
  * @file WLCloudsV.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
  * $/LicenseInfo$
  */
@@ -33,26 +33,26 @@ ATTRIBUTE vec2 texcoord0;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4  vary_CloudColorSun;
-VARYING vec4  vary_CloudColorAmbient;
+VARYING vec4 vary_CloudColorSun;
+VARYING vec4 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
-VARYING vec2  vary_texcoord0;
-VARYING vec2  vary_texcoord1;
-VARYING vec2  vary_texcoord2;
-VARYING vec2  vary_texcoord3;
+VARYING vec2 vary_texcoord0;
+VARYING vec2 vary_texcoord1;
+VARYING vec2 vary_texcoord2;
+VARYING vec2 vary_texcoord3;
 VARYING float altitude_blend_factor;
 
 // Inputs
 uniform vec3 camPosLocal;
 
-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 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;
 
@@ -60,7 +60,7 @@ uniform float cloud_shadow;
 uniform float density_multiplier;
 uniform float max_y;
 
-uniform vec4  glow;
+uniform vec4 glow;
 uniform float sun_moon_glow_factor;
 
 uniform vec4 cloud_color;
@@ -75,53 +75,53 @@ uniform float cloud_scale;
 //       indra\newview\llsettingsvo.cpp
 void main()
 {
-    // World / view / projection
-    gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
+	// World / view / projection
+	gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
 
-    // Texture coords
+	// Texture coords
     // SL-13084 EEP added support for custom cloud textures -- flip them horizontally to match the preview of Clouds > Cloud Scroll
     vary_texcoord0 = vec2(-texcoord0.x, texcoord0.y);  // See: LLSettingsVOSky::applySpecial
 
-    vary_texcoord0.xy -= 0.5;
-    vary_texcoord0.xy /= cloud_scale;
-    vary_texcoord0.xy += 0.5;
+	vary_texcoord0.xy -= 0.5;
+	vary_texcoord0.xy /= cloud_scale;
+	vary_texcoord0.xy += 0.5;
 
-    vary_texcoord1 = vary_texcoord0;
-    vary_texcoord1.x += lightnorm.x * 0.0125;
-    vary_texcoord1.y += lightnorm.z * 0.0125;
+	vary_texcoord1 = vary_texcoord0;
+	vary_texcoord1.x += lightnorm.x * 0.0125;
+	vary_texcoord1.y += lightnorm.z * 0.0125;
 
-    vary_texcoord2 = vary_texcoord0 * 16.;
-    vary_texcoord3 = vary_texcoord1 * 16.;
+	vary_texcoord2 = vary_texcoord0 * 16.;
+	vary_texcoord3 = vary_texcoord1 * 16.;
 
-    // Get relative position
+	// Get relative position
     vec3 rel_pos = position.xyz - camPosLocal.xyz + vec3(0, 50, 0);
 
     altitude_blend_factor = clamp((rel_pos.y + 512.0) / max_y, 0.0, 1.0);
 
-    // Set altitude
+	// Set altitude
     if (rel_pos.y > 0)
-    {
+	{
         rel_pos *= (max_y / rel_pos.y);
-    }
+	}
     if (rel_pos.y < 0)
-    {
-        altitude_blend_factor = 0;  // SL-11589 Fix clouds drooping below horizon
+	{
+		altitude_blend_factor = 0; // SL-11589 Fix clouds drooping below horizon
         rel_pos *= (-32000. / rel_pos.y);
-    }
+	}
 
-    // Can normalize then
+	// Can normalize then
     vec3  rel_pos_norm = normalize(rel_pos);
     float rel_pos_len  = length(rel_pos);
 
-    // Initialize temp variables
-    vec4 sunlight = sunlight_color;
-    vec4 light_atten;
+	// Initialize temp variables
+	vec4 sunlight = sunlight_color;
+	vec4 light_atten;
 
-    // Sunlight attenuation effect (hue and brightness) due to atmosphere
-    // this is used later for sunlight modulation at various altitudes
+	// 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)) * (density_multiplier * max_y);
 
-    // Calculate relative weights
+	// Calculate relative weights
     vec4 combined_haze = abs(blue_density) + vec4(abs(haze_density));
     vec4 blue_weight   = blue_density / combined_haze;
     vec4 haze_weight   = haze_density / combined_haze;
@@ -130,63 +130,64 @@ void main()
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
     sunlight *= exp(-light_atten * off_axis);
 
-    // Distance
+	// Distance
     float density_dist = rel_pos_len * density_multiplier;
 
     // Transparency (-> combined_haze)
     // ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati
-    // compiler gets confused.
+	// compiler gets confused.
     combined_haze = exp(-combined_haze * density_dist);
 
-    // Compute haze glow
+	// Compute haze glow
     float haze_glow = 1.0 - dot(rel_pos_norm, lightnorm.xyz);
     // haze_glow is 0 at the sun and increases away from sun
     haze_glow = max(haze_glow, .001);
-    // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+		// Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
     haze_glow *= glow.x;
-    // Higher glow.x gives dimmer glow (because next step is 1 / "angle")
+		// Higher glow.x gives dimmer glow (because next step is 1 / "angle")
     haze_glow = pow(haze_glow, glow.z);
-    // glow.z should be negative, so we're doing a sort of (1 / "angle") function
+		// glow.z should be negative, so we're doing a sort of (1 / "angle") function
 
     haze_glow *= sun_moon_glow_factor;
 
-    // Add "minimum anti-solar illumination"
+	// Add "minimum anti-solar illumination"
     // For sun, add to glow.  For moon, remove glow entirely. SL-13768
     haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (haze_glow + 0.25);
 
-    // Increase ambient when there are more clouds
-    vec4 tmpAmbient = ambient_color;
-    tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5;
+	// Increase ambient when there are more clouds
+	vec4 tmpAmbient = ambient_color;
+	tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5; 
 
-    // Dim sunlight by cloud shadow percentage
-    sunlight *= (1. - cloud_shadow);
+	// Dim sunlight by cloud shadow percentage
+	sunlight *= (1. - cloud_shadow);
 
-    // Haze color below cloud
+	// Haze color below cloud
     vec4 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
-    // CLOUDS
+	// CLOUDS
+    sunlight = sunlight_color;  // SL-14707 reset color -- Clouds are unusually dim in EEP
     off_axis = 1.0 / max(1e-6, lightnorm.y * 2.);
     sunlight *= exp(-light_atten * off_axis);
 
-    // Cloud color out
+	// Cloud color out
     vary_CloudColorSun     = (sunlight * haze_glow) * cloud_color;
-    vary_CloudColorAmbient = tmpAmbient * cloud_color;
-
-    // Attenuate cloud color by atmosphere
+	vary_CloudColorAmbient = tmpAmbient * cloud_color;
+	
+	// Attenuate cloud color by atmosphere
     combined_haze = sqrt(combined_haze);  // less atmos opacity (more transparency) below clouds
     vary_CloudColorSun *= combined_haze;
     vary_CloudColorAmbient *= combined_haze;
     vec4 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - combined_haze);
 
-    // Make a nice cloud density based on the cloud_shadow value that was passed in.
-    vary_CloudDensity = 2. * (cloud_shadow - 0.25);
+	// Make a nice cloud density based on the cloud_shadow value that was passed in.
+	vary_CloudDensity = 2. * (cloud_shadow - 0.25);
 
-    // Combine these to minimize register use
-    vary_CloudColorAmbient += oHazeColorBelowCloud;
+	// Combine these to minimize register use
+	vary_CloudColorAmbient += oHazeColorBelowCloud;
 
-    // needs this to compile on mac
-    // vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
+	// needs this to compile on mac
+	//vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
 
-    // END CLOUDS
+	// END CLOUDS
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/fullbrightShinyF.glsl b/indra/newview/app_settings/shaders/class1/deferred/fullbrightShinyF.glsl
index 6b36d00f97..9fcee04c32 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/fullbrightShinyF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/fullbrightShinyF.glsl
@@ -64,28 +64,27 @@ void main()
 #else
 	vec4 color = texture2D(diffuseMap, vary_texcoord0.xy);
 #endif
-
+	
 	color.rgb *= vertex_color.rgb;
 
 	// SL-9632 HUDs are affected by Atmosphere
 	if (no_atmo == 0)
 	{
-		vec3 sunlit;
-		vec3 amblit;
-		vec3 additive;
-		vec3 atten;
+	vec3 sunlit;
+	vec3 amblit;
+	vec3 additive;
+	vec3 atten;
 		vec3 pos = vary_position.xyz/vary_position.w;
 
-		calcAtmosphericVars(pos.xyz, vec3(0), 1.0, sunlit, amblit, additive, atten, false);
-
-		vec3 envColor = textureCube(environmentMap, vary_texcoord1.xyz).rgb;
-		float env_intensity = vertex_color.a;
+	calcAtmosphericVars(pos.xyz, vec3(0), 1.0, sunlit, amblit, additive, atten, false);
+	
+	vec3 envColor = textureCube(environmentMap, vary_texcoord1.xyz).rgb;	
+	float env_intensity = vertex_color.a;
 
 	//color.rgb = srgb_to_linear(color.rgb);
 		color.rgb = mix(color.rgb, envColor.rgb, env_intensity);
-
-		color.rgb = fullbrightAtmosTransportFrag(color.rgb, additive, atten);
-		color.rgb = fullbrightScaleSoftClip(color.rgb);
+	color.rgb = fullbrightAtmosTransportFrag(color.rgb, additive, atten);
+	color.rgb = fullbrightScaleSoftClip(color.rgb);
 	}
 
 /*
diff --git a/indra/newview/app_settings/shaders/class1/deferred/impostorF.glsl b/indra/newview/app_settings/shaders/class1/deferred/impostorF.glsl
index d29e8a9423..eb6e56e718 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/impostorF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/impostorF.glsl
@@ -40,6 +40,8 @@ uniform sampler2D specularMap;
 
 VARYING vec2 vary_texcoord0;
 
+vec3 linear_to_srgb(vec3 c);
+
 void main() 
 {
 	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
@@ -52,6 +54,7 @@ void main()
 	vec4 norm = texture2D(normalMap,   vary_texcoord0.xy);
 	vec4 spec = texture2D(specularMap, vary_texcoord0.xy);
 
+	col.rgb = linear_to_srgb(col.rgb);
 	frag_data[0] = vec4(col.rgb, 0.0);
 	frag_data[1] = spec;
 	frag_data[2] = vec4(norm.xy,0,0);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
index 80d19102b6..e1f7031af6 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
@@ -406,6 +406,8 @@ void main()
 
     vec3 light = vec3(0, 0, 0);
     
+    final_specular.rgb = srgb_to_linear(final_specular.rgb); // SL-14035
+
 #define LIGHT_LOOP(i) light.rgb += calcPointLightOrSpotLight(light_diffuse[i].rgb, npos, diffuse.rgb, final_specular, pos.xyz, norm.xyz, light_position[i], light_direction[i].xyz, light_attenuation[i].x, light_attenuation[i].y, light_attenuation[i].z, glare, light_attenuation[i].w );
 
     LIGHT_LOOP(1)
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
index 8c402fcb54..09c47165dd 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiPointLightF.glsl
@@ -73,9 +73,7 @@ void main()
     vec3 norm = getNorm(frag.xy);
 
     vec4 spec = texture2DRect(specularRect, frag.xy);
-    spec.rgb  = srgb_to_linear(spec.rgb);
     vec3 diff = texture2DRect(diffuseRect, frag.xy).rgb;
-    diff.rgb  = srgb_to_linear(diff.rgb);
 
     float noise = texture2D(noiseMap, frag.xy / 128.0).b;
     vec3  npos  = normalize(-pos);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
index 9bba45bc4e..ec3fb9c543 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/multiSpotLightF.glsl
@@ -182,10 +182,6 @@ void main()
 		
 		
 	vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
-    // SL-12005 Projector light pops as we get closer, more objectionable than being in wrong color space.
-    //          We can't switch to linear here unless we do it everywhere*
-	// *gbuffer is sRGB, convert to linear whenever sampling from it
-    diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
 
 	vec3 dlit = vec3(0, 0, 0);
 	
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
index d805c9ea48..18616a9bb3 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
@@ -90,7 +90,6 @@ void main()
     float noise = texture2D(noiseMap, frag.xy/128.0).b;
     
     vec3 col = texture2DRect(diffuseRect, frag.xy).rgb;
-    col.rgb = srgb_to_linear(col.rgb);
 
     float fa = falloff+1.0;
     float dist_atten = clamp(1.0-(dist-1.0*(1.0-fa))/fa, 0.0, 1.0);
@@ -127,7 +126,7 @@ void main()
     {
         discard;
     }
-//col.rgb = vec3(0);        
+
     frag_color.rgb = col;   
     frag_color.a = 0.0;
 }
diff --git a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
index f80f1a985a..7f2c603f87 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
@@ -90,7 +90,7 @@ void main()
     vec4 diffuse = texture2DRect(diffuseRect, tc);
 
     //convert to gamma space
-    //diffuse.rgb = linear_to_srgb(diffuse.rgb);
+    diffuse.rgb = linear_to_srgb(diffuse.rgb); // SL-14035
 
     vec4 spec = texture2DRect(specularRect, vary_fragcoord.xy);
     vec3 color = vec3(0);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/sunDiscF.glsl b/indra/newview/app_settings/shaders/class1/deferred/sunDiscF.glsl
index 454af2a9bc..b2fa5d8a25 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/sunDiscF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/sunDiscF.glsl
@@ -49,10 +49,6 @@ void main()
     vec4 sunDiscB = texture2D(altDiffuseMap, vary_texcoord0.xy);
     vec4 c     = mix(sunDiscA, sunDiscB, blend_factor);
 
-    c.rgb = srgb_to_linear(c.rgb);
-    c.rgb = clamp(c.rgb, vec3(0), vec3(1));
-    c.rgb = pow(c.rgb, vec3(0.7f));
-
     //c.rgb = fullbrightAtmosTransport(c.rgb);
     c.rgb = fullbrightScaleSoftClip(c.rgb);
 
diff --git a/indra/newview/app_settings/shaders/class1/lighting/lightFullbrightShinyF.glsl b/indra/newview/app_settings/shaders/class1/lighting/lightFullbrightShinyF.glsl
index 6f7e777d23..5e966293c6 100644
--- a/indra/newview/app_settings/shaders/class1/lighting/lightFullbrightShinyF.glsl
+++ b/indra/newview/app_settings/shaders/class1/lighting/lightFullbrightShinyF.glsl
@@ -48,15 +48,15 @@ void fullbright_shiny_lighting()
 {
 	vec4 color = diffuseLookup(vary_texcoord0.xy);
 	color.rgb *= vertex_color.rgb;
-
+	
 	// SL-9632 HUDs are affected by Atmosphere
 	if (no_atmo == 0)
 	{
-		vec3 envColor = textureCube(environmentMap, vary_texcoord1.xyz).rgb;
-		color.rgb = mix(color.rgb, envColor.rgb, vertex_color.a*0.75); // MAGIC NUMBER SL-12574; ALM: Off, Quality > Low
+	vec3 envColor = textureCube(environmentMap, vary_texcoord1.xyz).rgb;	
+	color.rgb = mix(color.rgb, envColor.rgb, vertex_color.a*0.75); // MAGIC NUMBER SL-12574; ALM: Off, Quality > Low
 
-		color.rgb = fullbrightShinyAtmosTransport(color.rgb);
-		color.rgb = fullbrightScaleSoftClip(color.rgb);
+	color.rgb = fullbrightShinyAtmosTransport(color.rgb);
+	color.rgb = fullbrightScaleSoftClip(color.rgb);
 	}
 /*
 	// NOTE: HUD objects will be full bright. Uncomment if you want "some" environment lighting effecting these HUD objects.
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
index a0699affbf..3b4d358cfa 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsF.glsl
@@ -1,30 +1,37 @@
-/** 
+/**
  * @file class1\windlight\atmosphericVarsF.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
  * $/LicenseInfo$
  */
- 
 
-vec3 getPositionEye()
-{
-	return vec3(0,0,0);
-}
+VARYING vec3 vary_AdditiveColor;
+VARYING vec3 vary_AtmosAttenuation;
+
+vec3 getAmblitColor() { return vec3(0, 0, 0); }
+
+vec3 getAdditiveColor() { return vary_AdditiveColor; }
+
+vec3 getAtmosAttenuation() { return vec3(vary_AtmosAttenuation); }
+
+vec3 getSunlitColor() { return vec3(0, 0, 0); }
+
+vec3 getPositionEye() { return vec3(0, 0, 0); }
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
index bd1d150fc8..1fea2c3628 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsV.glsl
@@ -1,36 +1,56 @@
-/** 
+/**
  * @file class1\windlight\atmosphericVarsV.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
  * $/LicenseInfo$
  */
- 
 
+VARYING vec3 vary_AdditiveColor;
+VARYING vec3 vary_AtmosAttenuation;
 
-vec3 getPositionEye()
+vec3 additive_color;
+vec3 atmos_attenuation;
+vec3 sunlit_color;
+vec3 amblit_color;
+vec3 position_eye;
+
+vec3 getSunlitColor() { return sunlit_color; }
+void setSunlitColor(vec3 v) { sunlit_color = v; }
+
+vec3 getAdditiveColor() { return additive_color; }
+void setAdditiveColor(vec3 v)
 {
-	return vec3(0,0,0);
+    additive_color     = v;
+    vary_AdditiveColor = v;
 }
 
-void setPositionEye(vec3 v)
+vec3 getAmblitColor() { return amblit_color; }
+void setAmblitColor(vec3 v) { amblit_color = v; }
+
+vec3 getAtmosAttenuation() { return atmos_attenuation; }
+void setAtmosAttenuation(vec3 v)
 {
-	
+    atmos_attenuation     = v;
+    vary_AtmosAttenuation = v;
 }
+
+vec3 getPositionEye() { return position_eye; }
+void setPositionEye(vec3 v) { position_eye = v; }
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
index 5dc086ab1e..f83434b7ec 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterF.glsl
@@ -1,33 +1,38 @@
-/** 
+/**
  * @file class1\windlight\atmosphericVarsWaterF.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
  * $/LicenseInfo$
  */
- 
 
 VARYING vec3 vary_PositionEye;
+VARYING vec3 vary_AdditiveColor;
+VARYING vec3 vary_AtmosAttenuation;
+
+vec3 getSunlitColor() { return vec3(0, 0, 0); }
+
+vec3 getAmblitColor() { return vec3(0, 0, 0); }
+
+vec3 getAdditiveColor() { return vary_AdditiveColor; }
 
-vec3 getPositionEye()
-{
-	return vary_PositionEye;
-}
+vec3 getAtmosAttenuation() { return vary_AtmosAttenuation; }
 
+vec3 getPositionEye() { return vary_PositionEye; }
diff --git a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
index e59eca265a..65d1176777 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/atmosphericsVarsWaterV.glsl
@@ -1,37 +1,51 @@
-/** 
+/**
  * @file class1\windlight\atmosphericVarsWaterV.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
  * $/LicenseInfo$
  */
- 
- 
+
 VARYING vec3 vary_PositionEye;
+VARYING vec3 vary_AdditiveColor;
+VARYING vec3 vary_AtmosAttenuation;
 
-vec3 getPositionEye()
-{
-	return vary_PositionEye;
-}
+vec3 atmos_attenuation;
+vec3 sunlit_color;
+vec3 amblit_color;
+
+vec3 getSunlitColor() { return sunlit_color; }
+void setSunlitColor(vec3 v) { sunlit_color = v; }
+
+vec3 getAmblitColor() { return amblit_color; }
+void setAmblitColor(vec3 v) { amblit_color = v; }
 
-void setPositionEye(vec3 v)
+vec3 getAdditiveColor() { return vary_AdditiveColor; }
+void setAdditiveColor(vec3 v) { vary_AdditiveColor = v; }
+
+vec3 getAtmosAttenuation() { return atmos_attenuation; }
+void setAtmosAttenuation(vec3 v)
 {
-	vary_PositionEye = v;
+    atmos_attenuation     = v;
+    vary_AtmosAttenuation = v;
 }
+
+vec3 getPositionEye() { return vary_PositionEye; }
+void setPositionEye(vec3 v) { vary_PositionEye = v; }
diff --git a/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl b/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl
index b9ae7a0226..5a41dc644a 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/sunDiscF.glsl
@@ -51,7 +51,6 @@ void main()
 // 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/class2/deferred/multiSpotLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
index 5d7a28c359..1b7a1cc6ec 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/multiSpotLightF.glsl
@@ -191,10 +191,6 @@ void main()
     float da = dot(norm, lv);
         
     vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
-    // SL-12005 Projector light pops as we get closer, more objectionable than being in wrong color space.
-    //          We can't switch to linear here unless we do it everywhere*
-    // *gbuffer IS sRGB, convert to linear since this shader outputs linear
-    diff_tex.rgb = srgb_to_linear(diff_tex.rgb);
  
     vec4 spec = texture2DRect(specularRect, frag.xy);
 
diff --git a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
index 1485c515a4..6841a8194f 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
@@ -73,7 +73,21 @@ uniform float ice_level;
 
 vec3 rainbow(float d)
 {
-    d         = clamp(d, -1.0, 0.0);
+    // d is the dot product of view and sun directions, so ranging -1.0..1.0
+    // 'interesting' values of d are the range -0.75..-0.825, when view is nearly opposite of sun vec
+    // Rainbox texture mode is GL_REPEAT, so tc of -.75 is equiv to 0.25, -0.825 equiv to 0.175.
+
+    // SL-13629 Rainbow texture has colors within the correct .175...250 range, but order is inverted.
+    // Rather than replace the texture, we mirror and translate the y tc to keep the colors within the
+    // interesting range, but in reversed order:  i.e. d = (1 - d) - 1.575
+    d = clamp(-0.575 - d, 0.0, 1.0);
+
+    // With the colors in the lower 1/4 of the texture, inverting the coords leaves most of it inaccessible.
+    // So, we can stretch the texcoord above the colors (ie > 0.25) to fill the entire remaining coordinate
+    // space. This improves gradation, reduces banding within the rainbow interior. (1-0.25) / (0.425/0.25) = 4.2857
+    float interior_coord = max(0.0, d - 0.25) * 4.2857;
+    d = clamp(d, 0.0, 0.25) + interior_coord;
+
     float rad = (droplet_radius - 5.0f) / 1024.0f;
     return pow(texture2D(rainbow_map, vec2(rad, d)).rgb, vec3(1.8)) * moisture_level;
 }
diff --git a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
index f4db53e0b7..7700d16007 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
@@ -87,8 +87,9 @@ void main()
     float light_gamma = 1.0 / 1.3;
     da                = pow(da, light_gamma);
 
-    vec4 diffuse = texture2DRect(diffuseRect, tc);
-    vec4 spec    = texture2DRect(specularRect, vary_fragcoord.xy);
+    vec4 diffuse     = texture2DRect(diffuseRect, tc);
+         diffuse.rgb = linear_to_srgb(diffuse.rgb); // SL-14025
+    vec4 spec        = texture2DRect(specularRect, vary_fragcoord.xy);
 
     vec2 scol_ambocc = texture2DRect(lightMap, vary_fragcoord.xy).rg;
     scol_ambocc      = pow(scol_ambocc, vec2(light_gamma));
diff --git a/indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl
index 5ab0b5c5b4..774f537821 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/spotLightF.glsl
@@ -189,7 +189,7 @@ void main()
 	lv = normalize(lv);
 	float da = dot(norm, lv);
 		
-	vec3 diff_tex = srgb_to_linear(texture2DRect(diffuseRect, frag.xy).rgb);
+	vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
 	vec4 spec = texture2DRect(specularRect, frag.xy);
 	vec3 dlit = vec3(0, 0, 0);
 
diff --git a/indra/newview/app_settings/shaders/class2/windlight/atmosphericsVarsF.glsl b/indra/newview/app_settings/shaders/class2/windlight/atmosphericsVarsF.glsl
index d758f85d71..07733bda18 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/atmosphericsVarsF.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/atmosphericsVarsF.glsl
@@ -1,5 +1,5 @@
 /** 
- * @file class2\wl\atmosphericVars.glsl
+ * @file class2\wl\atmosphericVarsF.glsl
  *
  * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
diff --git a/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl b/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
index 75bf8730df..fa928d993e 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
@@ -26,9 +26,9 @@
 /*[EXTRA_CODE_HERE]*/ 
 
 #ifdef DEFINE_GL_FRAGCOLOR
-out vec4 frag_data[3];
+out vec4 frag_color;
 #else
-#define frag_data gl_FragData
+#define frag_color gl_FragColor
 #endif
 
 /////////////////////////////////////////////////////////////////////////
@@ -126,8 +126,6 @@ void main()
     color.rgb = scaleSoftClip(color.rgb);
 
     /// Gamma correct for WL (soft clip effect).
-    frag_data[0] = vec4(color.rgb, alpha1);
-    frag_data[1] = vec4(0.0,0.0,0.0,0.0);
-    frag_data[2] = vec4(0,0,0,1);
+    frag_color = vec4(color.rgb, alpha1);
 }
 
diff --git a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
index 1f881eb44b..97ffa9feef 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
@@ -1,24 +1,24 @@
-/**
+/** 
  * @file class2\wl\cloudsV.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
  * $/LicenseInfo$
  */
@@ -33,26 +33,26 @@ ATTRIBUTE vec2 texcoord0;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4  vary_CloudColorSun;
-VARYING vec4  vary_CloudColorAmbient;
+VARYING vec4 vary_CloudColorSun;
+VARYING vec4 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
-VARYING vec2  vary_texcoord0;
-VARYING vec2  vary_texcoord1;
-VARYING vec2  vary_texcoord2;
-VARYING vec2  vary_texcoord3;
+VARYING vec2 vary_texcoord0;
+VARYING vec2 vary_texcoord1;
+VARYING vec2 vary_texcoord2;
+VARYING vec2 vary_texcoord3;
 VARYING float altitude_blend_factor;
 
 // Inputs
 uniform vec3 camPosLocal;
 
-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 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;
 
@@ -60,7 +60,7 @@ uniform float cloud_shadow;
 uniform float density_multiplier;
 uniform float max_y;
 
-uniform vec4  glow;
+uniform vec4 glow;
 uniform float sun_moon_glow_factor;
 
 uniform vec4 cloud_color;
@@ -75,8 +75,8 @@ uniform float cloud_scale;
 //       indra\newview\llsettingsvo.cpp
 void main()
 {
-    // World / view / projection
-    gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
+	// World / view / projection
+	gl_Position = modelview_projection_matrix * vec4(position.xyz, 1.0);
 
     // Texture coords
     // SL-13084 EEP added support for custom cloud textures -- flip them horizontally to match the preview of Clouds > Cloud Scroll
@@ -93,7 +93,7 @@ void main()
     vary_texcoord2 = vary_texcoord0 * 16.;
     vary_texcoord3 = vary_texcoord1 * 16.;
 
-    // Get relative position
+	// Get relative position
     vec3 rel_pos = position.xyz - camPosLocal.xyz + vec3(0, 50, 0);
 
     // fade clouds beyond a certain point so the bottom of the sky dome doesn't look silly at high altitude
@@ -101,27 +101,27 @@ void main()
 
     // Adj position vector to clamp altitude
     if (rel_pos.y > 0.)
-    {
+	{
         rel_pos *= (max_y / rel_pos.y);
-    }
+	}
     if (rel_pos.y < 0.)
-    {
+	{
         rel_pos *= (-32000. / rel_pos.y);
-    }
+	}
 
-    // Can normalize then
+	// Can normalize then
     vec3  rel_pos_norm = normalize(rel_pos);
     float rel_pos_len  = length(rel_pos);
 
-    // Initialize temp variables
-    vec4 sunlight = sunlight_color;
-    vec4 light_atten;
+	// Initialize temp variables
+	vec4 sunlight = sunlight_color;
+	vec4 light_atten;
 
-    // Sunlight attenuation effect (hue and brightness) due to atmosphere
-    // this is used later for sunlight modulation at various altitudes
+	// 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)) * (density_multiplier * max_y);
 
-    // Calculate relative weights
+	// Calculate relative weights
     vec4 combined_haze = abs(blue_density) + vec4(abs(haze_density));
     vec4 blue_weight   = blue_density / combined_haze;
     vec4 haze_weight   = haze_density / combined_haze;
@@ -130,63 +130,64 @@ void main()
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
     sunlight *= exp(-light_atten * off_axis);
 
-    // Distance
+	// Distance
     float density_dist = rel_pos_len * density_multiplier;
 
     // Transparency (-> combined_haze)
     // ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati
-    // compiler gets confused.
+	// compiler gets confused.
     combined_haze = exp(-combined_haze * density_dist);
 
-    // Compute haze glow
+	// Compute haze glow
     float haze_glow = 1.0 - dot(rel_pos_norm, lightnorm.xyz);
     // haze_glow is 0 at the sun and increases away from sun
     haze_glow = max(haze_glow, .001);
-    // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
+		// Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
     haze_glow *= glow.x;
-    // Higher glow.x gives dimmer glow (because next step is 1 / "angle")
+		// Higher glow.x gives dimmer glow (because next step is 1 / "angle")
     haze_glow = pow(haze_glow, glow.z);
-    // glow.z should be negative, so we're doing a sort of (1 / "angle") function
+		// glow.z should be negative, so we're doing a sort of (1 / "angle") function
 
     haze_glow *= sun_moon_glow_factor;
 
-    // Add "minimum anti-solar illumination"
+	// Add "minimum anti-solar illumination"
     // For sun, add to glow.  For moon, remove glow entirely. SL-13768
     haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (haze_glow + 0.25);
 
-    // Increase ambient when there are more clouds
-    vec4 tmpAmbient = ambient_color;
-    tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5;
+	// Increase ambient when there are more clouds
+	vec4 tmpAmbient = ambient_color;
+	tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5; 
 
-    // Dim sunlight by cloud shadow percentage
-    sunlight *= (1. - cloud_shadow);
+	// Dim sunlight by cloud shadow percentage
+	sunlight *= (1. - cloud_shadow);
 
-    // Haze color below cloud
+	// Haze color below cloud
     vec4 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
-    // CLOUDS
+	// CLOUDS
+    sunlight = sunlight_color;  // SL-14707 reset color -- Clouds are unusually dim in EEP
     off_axis = 1.0 / max(1e-6, lightnorm.y * 2.);
     sunlight *= exp(-light_atten * off_axis);
 
-    // Cloud color out
+	// Cloud color out
     vary_CloudColorSun     = (sunlight * haze_glow) * cloud_color;
-    vary_CloudColorAmbient = tmpAmbient * cloud_color;
-
-    // Attenuate cloud color by atmosphere
+	vary_CloudColorAmbient = tmpAmbient * cloud_color;
+	
+	// Attenuate cloud color by atmosphere
     combined_haze = sqrt(combined_haze);  // less atmos opacity (more transparency) below clouds
     vary_CloudColorSun *= combined_haze;
     vary_CloudColorAmbient *= combined_haze;
     vec4 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - combined_haze);
 
-    // Make a nice cloud density based on the cloud_shadow value that was passed in.
-    vary_CloudDensity = 2. * (cloud_shadow - 0.25);
+	// Make a nice cloud density based on the cloud_shadow value that was passed in.
+	vary_CloudDensity = 2. * (cloud_shadow - 0.25);
 
-    // Combine these to minimize register use
-    vary_CloudColorAmbient += oHazeColorBelowCloud;
+	// Combine these to minimize register use
+	vary_CloudColorAmbient += oHazeColorBelowCloud;
 
-    // needs this to compile on mac
-    // vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
+	// needs this to compile on mac
+	//vary_AtmosAttenuation = vec3(0.0,0.0,0.0);
 
-    // END CLOUDS
+	// END CLOUDS
 }
diff --git a/indra/newview/app_settings/shaders/class3/deferred/lightUtil.glsl b/indra/newview/app_settings/shaders/class3/deferred/lightUtil.glsl
deleted file mode 100644
index 8bb3f07fc6..0000000000
--- a/indra/newview/app_settings/shaders/class3/deferred/lightUtil.glsl
+++ /dev/null
@@ -1,117 +0,0 @@
-/** 
- * @file lightInfo.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
- * $/LicenseInfo$
- */
-
-struct DirectionalLightInfo
-{
-    vec4 pos;
-    float depth;
-    vec4 normal;
-    vec3 normalizedLightDirection;
-    vec3 normalizedToLight;
-    float lightIntensity;
-    vec3 lightDiffuseColor;
-    float specExponent;
-    float shadow;
-};
-
-struct SpotLightInfo
-{
-    vec4 pos;
-    float depth;
-    vec4 normal;
-    vec3 normalizedLightDirection;
-    vec3 normalizedToLight;
-    float lightIntensity;
-    float attenuation;
-    float distanceToLight;
-    vec3 lightDiffuseColor;
-    float innerHalfAngleCos;
-    float outerHalfAngleCos;
-    float spotExponent;
-    float specExponent;
-    float shadow;
-};
-
-struct PointLightInfo
-{
-    vec4 pos;
-    float depth;
-    vec4 normal;
-    vec3 normalizedToLight;
-    float lightIntensity;
-    float attenuation;
-    float distanceToLight;
-    vec3 lightDiffuseColor;
-    float lightRadius;
-    float specExponent;
-    vec3 worldspaceLightDirection;
-    float shadow;
-};
-
-float attenuate(float attenuationSelection, float distanceToLight)
-{
-// LLRENDER_REVIEW
-// sh/could eventually consume attenuation func defined in texture
-    return (attenuationSelection == 0.0f) ? 1.0f : // none
-           (attenuationSelection <  1.0f) ? (1.0f / distanceToLight) : // linear atten 
-           (attenuationSelection <  2.0f) ? (1.0f / (distanceToLight*distanceToLight)) // quadratic atten
-										  : (1.0f / (distanceToLight*distanceToLight*distanceToLight));	// cubic atten    
-}
-
-
-vec3 lightDirectional(struct DirectionalLightInfo dli)
-{
-    float lightIntensity = dli.lightIntensity;
-	lightIntensity *= dot(dli.normal.xyz, dli.normalizedLightDirection);
-    //lightIntensity *= directionalShadowSample(vec4(dli.pos.xyz, 1.0f), dli.depth, dli.directionalShadowMap, dli.directionalShadowMatrix);
-	return lightIntensity * dli.lightDiffuseColor;
-}
-
-
-vec3 lightSpot(struct SpotLightInfo sli)    
-{
-	float penumbraRange = (sli.outerHalfAngleCos - sli.innerHalfAngleCos);
-    float coneAngleCos = max(dot(sli.normalizedLightDirection, sli.normalizedToLight), 0.0);
-	float coneAttenFactor = (coneAngleCos <= sli.outerHalfAngleCos) ? 1.0f : pow(smoothstep(1,0, sli.outerHalfAngleCos / penumbraRange), sli.spotExponent);
-    float distanceAttenuation = attenuate(sli.attenuation, sli.distanceToLight);
-    float lightIntensity = sli.lightIntensity;
-    lightIntensity *= distanceAttenuation;
-	lightIntensity *= max(dot(sli.normal.xyz, sli.normalizedLightDirection), 0.0);
-	lightIntensity *= coneAttenFactor;
-    lightIntensity *= sli.shadow;
-	return lightIntensity * sli.lightDiffuseColor;
-}
-
-vec3 lightPoint(struct PointLightInfo pli)
-{
-    float padRadius = pli.lightRadius * 0.1; // distance for which to perform smoothed dropoff past light radius
-	float distanceAttenuation =	attenuate(pli.attenuation, pli.distanceToLight);
-    float lightIntensity = pli.lightIntensity;
-    lightIntensity*= distanceAttenuation;    
-	lightIntensity *= clamp((padRadius - pli.distanceToLight + pli.lightRadius) / padRadius, 0.0, 1.0);
-    lightIntensity *= pli.shadow;
-    lightIntensity *= max(dot(pli.normal.xyz, pli.normalizedToLight), 0.0);
-	return lightIntensity * pli.lightDiffuseColor;
-}
diff --git a/indra/newview/app_settings/shaders/class3/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class3/deferred/skyF.glsl
index 6de01cb667..a0b082ed7c 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/skyF.glsl
@@ -56,8 +56,23 @@ vec3 GetSkyLuminanceToPoint(vec3 camPos, vec3 pos, float shadow_length, vec3 dir
 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;
+    // d is the dot product of view and sun directions, so ranging -1.0..1.0
+    // 'interesting' values of d are the range -0.75..-0.825, when view is nearly opposite of sun vec
+    // Rainbox texture mode is GL_REPEAT, so tc of -.75 is equiv to 0.25, -0.825 equiv to 0.175.
+
+    // SL-13629 Rainbow texture has colors within the correct .175...250 range, but order is inverted.
+    // Rather than replace the texture, we mirror and translate the y tc to keep the colors within the
+    // interesting range, but in reversed order:  i.e. d = (1 - d) - 1.575
+    d = clamp(-0.575 - d, 0.0, 1.0);
+
+    // With the colors in the lower 1/4 of the texture, inverting the coords leaves most of it inaccessible.
+    // So, we can stretch the texcoord above the colors (ie > 0.25) to fill the entire remaining coordinate
+    // space. This improves gradation, reduces banding within the rainbow interior. (1-0.25) / (0.425/0.25) = 4.2857
+    float interior_coord = max(0.0, d - 0.25) * 4.2857;
+    d = clamp(d, 0.0, 0.25) + interior_coord;
+
+    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)