SL-18190 Cleanup -- convert some vec4's to vec3's (as they really are), remove some unused glsl files.

15 files changed, 131 insertions, 509 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/cloudShadowF.glsl b/indra/newview/app_settings/shaders/class1/deferred/cloudShadowF.glsl
deleted file mode 100644
index afcb309e33..0000000000
--- a/indra/newview/app_settings/shaders/class1/deferred/cloudShadowF.glsl
+++ /dev/null
@@ -1,126 +0,0 @@
-/** 
- * @file class3/deferred/cloudsF.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 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()
-{
-    // 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);
-
-    if (cloud_scale >= 0.0001)
-    {
-        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/deferred/cloudShadowV.glsl b/indra/newview/app_settings/shaders/class1/deferred/cloudShadowV.glsl
deleted file mode 100644
index effb070f93..0000000000
--- a/indra/newview/app_settings/shaders/class1/deferred/cloudShadowV.glsl
+++ /dev/null
@@ -1,63 +0,0 @@
-/** 
- * @file 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;
-VARYING vec4 vertex_color;
-
-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;
-	vertex_color = diffuse_color;
-}
diff --git a/indra/newview/app_settings/shaders/class1/deferred/cloudsF.glsl b/indra/newview/app_settings/shaders/class1/deferred/cloudsF.glsl
index 348e0f5228..788ce4a47b 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/cloudsF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/cloudsF.glsl
@@ -34,15 +34,15 @@ out vec4 frag_data[3];
 // The fragment shader for the sky
 /////////////////////////////////////////////////////////////////////////
 
-VARYING vec4 vary_CloudColorSun;
-VARYING vec4 vary_CloudColorAmbient;
+VARYING vec3 vary_CloudColorSun;
+VARYING vec3 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
 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 vec3 cloud_pos_density1;
+uniform vec3 cloud_pos_density2;
 uniform float cloud_scale;
 uniform float cloud_variance;
 
@@ -69,8 +69,8 @@ void main()
     vec2 uv1 = vary_texcoord0.xy;
     vec2 uv2 = vary_texcoord1.xy;
 
-    vec4 cloudColorSun = vary_CloudColorSun;
-    vec4 cloudColorAmbient = vary_CloudColorAmbient;
+    vec3 cloudColorSun = vary_CloudColorSun;
+    vec3 cloudColorAmbient = vary_CloudColorAmbient;
     float cloudDensity = vary_CloudDensity;
     vec2 uv3 = vary_texcoord2.xy;
     vec2 uv4 = vary_texcoord3.xy;
@@ -115,7 +115,7 @@ void main()
     alpha2 = 1. - alpha2 * alpha2;  
 
     // Combine
-    vec4 color;
+    vec3 color;
     color = (cloudColorSun*(1.-alpha2) + cloudColorAmbient);
     color.rgb= max(vec3(0), color.rgb);
     color.rgb *= 2.0;
diff --git a/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl b/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
index 8e0a001403..5ca210863e 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/cloudsV.glsl
@@ -33,8 +33,8 @@ ATTRIBUTE vec2 texcoord0;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4 vary_CloudColorSun;
-VARYING vec4 vary_CloudColorAmbient;
+VARYING vec3 vary_CloudColorSun;
+VARYING vec3 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
 VARYING vec2 vary_texcoord0;
@@ -46,13 +46,13 @@ VARYING float altitude_blend_factor;
 // Inputs
 uniform vec3 camPosLocal;
 
-uniform vec4 lightnorm;
-uniform vec4 sunlight_color;
-uniform vec4 moonlight_color;
+uniform vec3 lightnorm;
+uniform vec3 sunlight_color;
+uniform vec3 moonlight_color;
 uniform int sun_up_factor;
-uniform vec4 ambient_color;
-uniform vec4 blue_horizon;
-uniform vec4 blue_density;
+uniform vec3 ambient_color;
+uniform vec3 blue_horizon;
+uniform vec3 blue_density;
 uniform float haze_horizon;
 uniform float haze_density;
 
@@ -60,10 +60,10 @@ uniform float cloud_shadow;
 uniform float density_multiplier;
 uniform float max_y;
 
-uniform vec4 glow;
+uniform vec3 glow;
 uniform float sun_moon_glow_factor;
 
-uniform vec4 cloud_color;
+uniform vec3 cloud_color;
 
 uniform float cloud_scale;
 
@@ -114,17 +114,17 @@ void main()
     float rel_pos_len  = length(rel_pos);
 
 	// Initialize temp variables
-	vec4 sunlight = sunlight_color;
-	vec4 light_atten;
+	vec3 sunlight = sunlight_color;
+	vec3 light_atten;
 
 	// 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);
+    light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
 	// 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;
+    vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = haze_density / combined_haze;
 
     // Compute sunlight from rel_pos & lightnorm (for long rays like sky)
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
@@ -155,14 +155,14 @@ void main()
     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;
+	vec3 tmpAmbient = ambient_color;
 	tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5; 
 
 	// Dim sunlight by cloud shadow percentage
 	sunlight *= (1. - cloud_shadow);
 
 	// Haze color below cloud
-    vec4 additiveColorBelowCloud =
+    vec3 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
 	// CLOUDS
@@ -178,7 +178,7 @@ void main()
     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);
+    vec3 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);
diff --git a/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl b/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl
index a513d60388..b4044353b4 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/moonF.glsl
@@ -34,8 +34,7 @@ out vec4 frag_data[3];
 #endif
 
 uniform vec4 color;
-uniform vec4 sunlight_color;
-uniform vec4 moonlight_color;
+uniform vec3 moonlight_color;
 uniform vec3 moon_dir;
 uniform float moon_brightness;
 uniform sampler2D diffuseMap;
diff --git a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
index ecb0c43518..adc2db60b6 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/skyF.glsl
@@ -35,7 +35,7 @@ out vec4 frag_data[3];
 // The fragment shader for the sky
 /////////////////////////////////////////////////////////////////////////
 
-VARYING vec4 vary_HazeColor;
+VARYING vec3 vary_HazeColor;
 
 /// Soft clips the light with a gamma correction
 vec3 scaleSoftClip(vec3 light);
@@ -48,7 +48,7 @@ void main()
     // the fragment) if the sky wouldn't show up because the clouds 
     // are fully opaque.
 
-    vec4 color;
+    vec3 color;
     color = vary_HazeColor;
 
     color.rgb *= 2.;
diff --git a/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl b/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl
index 223143bc1b..ff53646fd4 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/skyV.glsl
@@ -32,18 +32,18 @@ ATTRIBUTE vec3 position;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4 vary_HazeColor;
+VARYING vec3 vary_HazeColor;
 
 // Inputs
 uniform vec3 camPosLocal;
 
-uniform vec4  lightnorm;
-uniform vec4  sunlight_color;
-uniform vec4  moonlight_color;
+uniform vec3  lightnorm;
+uniform vec3  sunlight_color;
+uniform vec3  moonlight_color;
 uniform int   sun_up_factor;
-uniform vec4  ambient_color;
-uniform vec4  blue_horizon;
-uniform vec4  blue_density;
+uniform vec3  ambient_color;
+uniform vec3  blue_horizon;
+uniform vec3  blue_density;
 uniform float haze_horizon;
 uniform float haze_density;
 
@@ -52,7 +52,7 @@ uniform float density_multiplier;
 uniform float distance_multiplier;
 uniform float max_y;
 
-uniform vec4  glow;
+uniform vec3  glow;
 uniform float sun_moon_glow_factor;
 
 // NOTE: Keep these in sync!
@@ -85,17 +85,17 @@ void main()
     float rel_pos_len = length(rel_pos);
 
     // Initialize temp variables
-    vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
-    vec4 light_atten;
+    vec3 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
+    vec3 light_atten;
 
     // 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);
+    light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
     // 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;
+    vec3 combined_haze = abs(blue_density) + vec4(abs(haze_density));
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = haze_density / combined_haze;
 
     // Compute sunlight from rel_pos & lightnorm (for long rays like sky)
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
@@ -123,21 +123,21 @@ void main()
     // 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);
 
-    vec4 color =
+    vec3 color =
         (blue_horizon * blue_weight * (sunlight + ambient_color) + (haze_horizon * haze_weight) * (sunlight * haze_glow + ambient_color));
 
     // Final atmosphere additive
     color *= (1. - combined_haze);
 
     // Increase ambient when there are more clouds
-    vec4 tmpAmbient = ambient_color;
-    tmpAmbient += max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5;
+    vec3 tmpAmbient = ambient_color;
+    tmpAmbient += max(vec3(0), (1. - ambient_color)) * cloud_shadow * 0.5;
 
     // Dim sunlight by cloud shadow percentage
     sunlight *= max(0.0, (1. - cloud_shadow));
 
     // Haze color below cloud
-    vec4 additiveColorBelowCloud =
+    vec3 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
     // Attenuate cloud color by atmosphere
diff --git a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl b/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
deleted file mode 100644
index 332fb9d809..0000000000
--- a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowF.glsl
+++ /dev/null
@@ -1,126 +0,0 @@
-/** 
- * @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 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
deleted file mode 100644
index 09b6004481..0000000000
--- a/indra/newview/app_settings/shaders/class1/windlight/cloudShadowV.glsl
+++ /dev/null
@@ -1,61 +0,0 @@
-/** 
- * @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/moonF.glsl b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
index 2425a2ad04..f03003f5e1 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
@@ -34,8 +34,7 @@ out vec4 frag_color;
 #endif
 
 uniform vec4 color;
-uniform vec4 sunlight_color;
-uniform vec4 moonlight_color;
+uniform vec3 moonlight_color;
 uniform vec3 moon_dir;
 uniform float moon_brightness;
 uniform sampler2D diffuseMap;
diff --git a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
index 4379024680..668f70c3ab 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl
@@ -32,13 +32,13 @@ uniform mat4 modelview_projection_matrix;
 // Inputs
 uniform vec3 camPosLocal;
 
-uniform vec4  lightnorm;
-uniform vec4  sunlight_color;
-uniform vec4  moonlight_color;
+uniform vec3  lightnorm;
+uniform vec3  sunlight_color;
+uniform vec3  moonlight_color;
 uniform int   sun_up_factor;
-uniform vec4  ambient_color;
-uniform vec4  blue_horizon;
-uniform vec4  blue_density;
+uniform vec3  ambient_color;
+uniform vec3  blue_horizon;
+uniform vec3  blue_density;
 uniform float haze_horizon;
 uniform float haze_density;
 
@@ -47,10 +47,10 @@ uniform float density_multiplier;
 uniform float distance_multiplier;
 uniform float max_y;
 
-uniform vec4  glow;
+uniform vec3  glow;
 uniform float sun_moon_glow_factor;
 
-uniform vec4 cloud_color;
+uniform vec3 cloud_color;
 
 #ifdef DEFINE_GL_FRAGCOLOR
 out vec4 frag_data[3];
@@ -123,16 +123,16 @@ void main()
     float rel_pos_len  = length(rel_pos);
 
     // Initialize temp variables
-    vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
+    vec3 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
 
     // Sunlight attenuation effect (hue and brightness) due to atmosphere
     // this is used later for sunlight modulation at various altitudes
-    vec4 light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y);
+    vec3 light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
     // 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;
+    vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = haze_density / combined_haze;
 
     // Compute sunlight from rel_pos & lightnorm (for long rays like sky)
     float off_axis = 1.0 / max(1e-6, max(0, rel_pos_norm.y) + lightnorm.y);
@@ -162,7 +162,7 @@ void main()
     haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (sun_moon_glow_factor * (haze_glow + 0.25));
 
     // Haze color above cloud
-    vec4 color = blue_horizon * blue_weight * (sunlight + ambient_color) 
+    vec3 color = blue_horizon * blue_weight * (sunlight + ambient_color) 
                + haze_horizon * haze_weight * (sunlight * haze_glow + ambient_color);
 
     // Final atmosphere additive
@@ -170,13 +170,13 @@ void main()
 
     // Increase ambient when there are more clouds
     // TODO 9/20: DJH what does this do?  max(0,(1-ambient)) will change the color
-    vec4 ambient = ambient_color + max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5;
+    vec3 ambient = ambient_color + max(vec3(0), (1. - ambient_color)) * cloud_shadow * 0.5;
 
     // Dim sunlight by cloud shadow percentage
     sunlight *= max(0.0, (1. - cloud_shadow));
 
     // Haze color below cloud
-    vec4 add_below_cloud = blue_horizon * blue_weight * (sunlight + ambient) 
+    vec3 add_below_cloud = blue_horizon * blue_weight * (sunlight + ambient) 
                          + haze_horizon * haze_weight * (sunlight * haze_glow + ambient);
 
     // Attenuate cloud color by atmosphere
diff --git a/indra/newview/app_settings/shaders/class2/windlight/atmosphericsFuncs.glsl b/indra/newview/app_settings/shaders/class2/windlight/atmosphericsFuncs.glsl
index 8937488484..c69eba93b6 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/atmosphericsFuncs.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/atmosphericsFuncs.glsl
@@ -23,17 +23,17 @@
  * $/LicenseInfo$
  */
 
-uniform vec4  lightnorm;
-uniform vec4  sunlight_color;
+uniform vec3  lightnorm;
+uniform vec3  sunlight_color;
 uniform vec3 sunlight_linear;
-uniform vec4  moonlight_color;
+uniform vec3  moonlight_color;
 uniform vec3 moonlight_linear;
 uniform int   sun_up_factor;
-uniform vec4  ambient_color;
+uniform vec3  ambient_color;
 uniform vec3 ambient_linear;
-uniform vec4  blue_horizon;
+uniform vec3  blue_horizon;
 uniform vec3 blue_horizon_linear;
-uniform vec4  blue_density;
+uniform vec3  blue_density;
 uniform vec3 blue_density_linear;
 uniform float haze_horizon;
 uniform float haze_density;
@@ -42,7 +42,7 @@ uniform float cloud_shadow;
 uniform float density_multiplier;
 uniform float distance_multiplier;
 uniform float max_y;
-uniform vec4  glow;
+uniform vec3  glow;
 uniform float scene_light_strength;
 uniform mat3  ssao_effect_mat;
 uniform int   no_atmo;
@@ -63,17 +63,17 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
 
     vec3  rel_pos_norm = normalize(rel_pos);
     float rel_pos_len  = length(rel_pos);
-    vec4  sunlight     = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
+    vec3  sunlight     = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
 
     // sunlight attenuation effect (hue and brightness) due to atmosphere
     // this is used later for sunlight modulation at various altitudes
-    vec4 light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y);
+    vec3 light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * 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
 
-    vec4 combined_haze = blue_density + vec4(haze_density);
-    vec4 blue_weight   = blue_density / combined_haze;
-    vec4 haze_weight   = vec4(haze_density) / combined_haze;
+    vec3 combined_haze = blue_density + vec3(haze_density);
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = vec3(haze_density) / combined_haze;
 
     //(TERRAIN) compute sunlight from lightnorm y component. Factor is roughly cosecant(sun elevation) (for short rays like terrain)
     float above_horizon_factor = 1.0 / max(1e-6, lightnorm.y);
@@ -111,10 +111,10 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
 
     haze_glow *= sun_moon_glow_factor;
 
-    vec4 amb_color = ambient_color;
+    vec3 amb_color = ambient_color;
 
     // increase ambient when there are more clouds
-    vec4 tmpAmbient = amb_color + (vec4(1.) - amb_color) * cloud_shadow * 0.5;
+    vec3 tmpAmbient = amb_color + (vec3(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
@@ -127,7 +127,7 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
      */
     if (use_ao)
     {
-        tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a);
+        tmpAmbient = mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor);
     }
 
     // Similar/Shared Algorithms:
@@ -179,17 +179,17 @@ void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, ou
 
     vec3  rel_pos_norm = normalize(rel_pos);
     float rel_pos_len  = length(rel_pos);
-    vec4  sunlight     = (sun_up_factor == 1) ? vec4(sunlight_linear, 0.0) : vec4(moonlight_linear, 0.0);
+    vec3  sunlight     = (sun_up_factor == 1) ? vec3(sunlight_linear, 0.0) : vec3(moonlight_linear, 0.0);
 
     // sunlight attenuation effect (hue and brightness) due to atmosphere
     // this is used later for sunlight modulation at various altitudes
-    vec4 light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y);
+    vec3 light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * 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
 
-    vec4 combined_haze = blue_density + vec4(haze_density);
-    vec4 blue_weight   = blue_density / combined_haze;
-    vec4 haze_weight   = vec4(haze_density) / combined_haze;
+    vec3 combined_haze = blue_density + vec3(haze_density);
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = vec3(haze_density) / combined_haze;
 
     //(TERRAIN) compute sunlight from lightnorm y component. Factor is roughly cosecant(sun elevation) (for short rays like terrain)
     float above_horizon_factor = 1.0 / max(1e-6, lightnorm.y);
@@ -227,11 +227,11 @@ void calcAtmosphericVarsLinear(vec3 inPositionEye, vec3 norm, vec3 light_dir, ou
 
     haze_glow *= sun_moon_glow_factor;
 
-    //vec4 amb_color = vec4(ambient_linear, 0.0);
-    vec4 amb_color = ambient_color;
+    //vec3 amb_color = vec4(ambient_linear, 0.0);
+    vec3 amb_color = ambient_color;
 
     // increase ambient when there are more clouds
-    vec4 tmpAmbient = amb_color + (vec4(1.) - amb_color) * cloud_shadow * 0.5;
+    vec3 tmpAmbient = amb_color + (vec3(1.) - amb_color) * cloud_shadow * 0.5;
 
     // Similar/Shared Algorithms:
     //     indra\llinventory\llsettingssky.cpp                                        -- LLSettingsSky::calculateLightSettings()
diff --git a/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl b/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
index fa928d993e..9c5a4903d0 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/cloudsF.glsl
@@ -35,15 +35,15 @@ out vec4 frag_color;
 // The fragment shader for the sky
 /////////////////////////////////////////////////////////////////////////
 
-VARYING vec4 vary_CloudColorSun;
-VARYING vec4 vary_CloudColorAmbient;
+VARYING vec3 vary_CloudColorSun;
+VARYING vec3 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
 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 vec3 cloud_pos_density1;
+uniform vec3 cloud_pos_density2;
 uniform float cloud_scale;
 uniform float cloud_variance;
 
@@ -70,8 +70,8 @@ void main()
     vec2 uv1 = vary_texcoord0.xy;
     vec2 uv2 = vary_texcoord1.xy;
 
-    vec4 cloudColorSun = vary_CloudColorSun;
-    vec4 cloudColorAmbient = vary_CloudColorAmbient;
+    vec3 cloudColorSun = vary_CloudColorSun;
+    vec3 cloudColorAmbient = vary_CloudColorAmbient;
     float cloudDensity = vary_CloudDensity;
     vec2 uv3 = vary_texcoord2.xy;
     vec2 uv4 = vary_texcoord3.xy;
@@ -120,7 +120,7 @@ void main()
     alpha2 = 1. - alpha2 * alpha2;  
 
     // Combine
-    vec4 color;
+    vec3 color;
     color = (cloudColorSun*(1.-alpha2) + cloudColorAmbient);
     color.rgb *= 2.;
     color.rgb = scaleSoftClip(color.rgb);
diff --git a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
index 97ffa9feef..650009d393 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl
@@ -33,8 +33,8 @@ ATTRIBUTE vec2 texcoord0;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4 vary_CloudColorSun;
-VARYING vec4 vary_CloudColorAmbient;
+VARYING vec3 vary_CloudColorSun;
+VARYING vec3 vary_CloudColorAmbient;
 VARYING float vary_CloudDensity;
 
 VARYING vec2 vary_texcoord0;
@@ -46,13 +46,13 @@ VARYING float altitude_blend_factor;
 // Inputs
 uniform vec3 camPosLocal;
 
-uniform vec4 lightnorm;
-uniform vec4 sunlight_color;
-uniform vec4 moonlight_color;
+uniform vec3 lightnorm;
+uniform vec3 sunlight_color;
+uniform vec3 moonlight_color;
 uniform int sun_up_factor;
-uniform vec4 ambient_color;
-uniform vec4 blue_horizon;
-uniform vec4 blue_density;
+uniform vec3 ambient_color;
+uniform vec3 blue_horizon;
+uniform vec3 blue_density;
 uniform float haze_horizon;
 uniform float haze_density;
 
@@ -60,10 +60,10 @@ uniform float cloud_shadow;
 uniform float density_multiplier;
 uniform float max_y;
 
-uniform vec4 glow;
+uniform vec3 glow;
 uniform float sun_moon_glow_factor;
 
-uniform vec4 cloud_color;
+uniform vec3 cloud_color;
 
 uniform float cloud_scale;
 
@@ -114,17 +114,17 @@ void main()
     float rel_pos_len  = length(rel_pos);
 
 	// Initialize temp variables
-	vec4 sunlight = sunlight_color;
-	vec4 light_atten;
+	vec3 sunlight = sunlight_color;
+	vec3 light_atten;
 
 	// 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);
+    light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
 	// 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;
+    vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = haze_density / combined_haze;
 
     // Compute sunlight from rel_pos & lightnorm (for long rays like sky)
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
@@ -155,14 +155,14 @@ void main()
     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;
+	vec3 tmpAmbient = ambient_color;
 	tmpAmbient += (1. - tmpAmbient) * cloud_shadow * 0.5; 
 
 	// Dim sunlight by cloud shadow percentage
 	sunlight *= (1. - cloud_shadow);
 
 	// Haze color below cloud
-    vec4 additiveColorBelowCloud =
+    vec3 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
 	// CLOUDS
@@ -178,7 +178,7 @@ void main()
     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);
+    vec3 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);
diff --git a/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl b/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl
index 3edc94f4ca..8f7726bb0b 100644
--- a/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl
+++ b/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl
@@ -32,18 +32,18 @@ ATTRIBUTE vec3 position;
 ///////////////////////////////////////////////////////////////////////////////
 
 // Output parameters
-VARYING vec4 vary_HazeColor;
+VARYING vec3 vary_HazeColor;
 
 // Inputs
 uniform vec3 camPosLocal;
 
-uniform vec4  lightnorm;
-uniform vec4  sunlight_color;
-uniform vec4  moonlight_color;
+uniform vec3  lightnorm;
+uniform vec3  sunlight_color;
+uniform vec3  moonlight_color;
 uniform int   sun_up_factor;
-uniform vec4  ambient_color;
-uniform vec4  blue_horizon;
-uniform vec4  blue_density;
+uniform vec3  ambient_color;
+uniform vec3  blue_horizon;
+uniform vec3  blue_density;
 uniform float haze_horizon;
 uniform float haze_density;
 
@@ -52,7 +52,7 @@ uniform float density_multiplier;
 uniform float distance_multiplier;
 uniform float max_y;
 
-uniform vec4  glow;
+uniform vec3  glow;
 uniform float sun_moon_glow_factor;
 
 void main()
@@ -81,17 +81,17 @@ void main()
     float rel_pos_len = length(rel_pos);
 
     // Initialize temp variables
-    vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
-    vec4 light_atten;
+    vec3 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color;
+    vec3 light_atten;
 
     // 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);
+    light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
     // 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;
+    vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
+    vec3 blue_weight   = blue_density / combined_haze;
+    vec3 haze_weight   = haze_density / combined_haze;
 
     // Compute sunlight from rel_pos & lightnorm (for long rays like sky)
     float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y);
@@ -119,21 +119,21 @@ void main()
     // 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);
 
-    vec4 color =
+    vec3 color =
         (blue_horizon * blue_weight * (sunlight + ambient_color) + (haze_horizon * haze_weight) * (sunlight * haze_glow + ambient_color));
 
     // Final atmosphere additive
     color *= (1. - combined_haze);
 
     // Increase ambient when there are more clouds
-    vec4 tmpAmbient = ambient_color;
-    tmpAmbient += max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5;
+    vec3 tmpAmbient = ambient_color;
+    tmpAmbient += max(vec3(0), (1. - ambient_color)) * cloud_shadow * 0.5;
 
     // Dim sunlight by cloud shadow percentage
     sunlight *= max(0.0, (1. - cloud_shadow));
 
     // Haze color below cloud
-    vec4 additiveColorBelowCloud =
+    vec3 additiveColorBelowCloud =
         (blue_horizon * blue_weight * (sunlight + tmpAmbient) + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient));
 
     // Attenuate cloud color by atmosphere