SL-13465 Restore Pre-EEP haze effecting moon

2 files changed, 15 insertions, 26 deletions

diff --git a/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
index 72d2c4cdfa..2425a2ad04 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/moonF.glsl
@@ -3,7 +3,7 @@
  *
  * $LicenseInfo:firstyear=2005&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2005, Linden Research, Inc.
+ * Copyright (C) 2005, 2020 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
@@ -36,37 +36,30 @@ out vec4 frag_color;
 uniform vec4 color;
 uniform vec4 sunlight_color;
 uniform vec4 moonlight_color;
-uniform vec3 lumWeights;
+uniform vec3 moon_dir;
 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;
 
-vec3 getAdditiveColor();
 vec3 scaleSoftClip(vec3 light);
 
 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 blend = 1.0f - dot(normalize(sunlight_color.rgb), luma_weights);
+    // Restore Pre-EEP alpha fade moon near horizon
+    float fade = 1.0;
+    if( moon_dir.z > 0 )
+        fade = clamp( moon_dir.z*moon_dir.z*4.0, 0.0, 1.0 );
 
-    vec3 exp = vec3(1.0 - blend * moon_brightness) * 2.0 - 1.0;
-    c.rgb = pow(c.rgb, exp);
-    //c.rgb *= moonlight_color.rgb;
+    vec4 c     = texture2D(diffuseMap, vary_texcoord0.xy);
+//       c.rgb = pow(c.rgb, vec3(0.7f)); // can't use "srgb_to_linear(color.rgb)" as that is a deferred only function
+         c.rgb *= moonlight_color.rgb;
+         c.rgb *= moon_brightness;
 
-    // Partial atmospherics calculation
-    vec3 ac = getAdditiveColor();
-    c.rgb += ac;
+         c.rgb *= fade;
+         c.a   *= fade;
 
-    c.rgb = scaleSoftClip(c.rgb);
+         c.rgb  = scaleSoftClip(c.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
index c4cdd06e28..2fceb5f743 100644
--- a/indra/newview/app_settings/shaders/class1/windlight/moonV.glsl
+++ b/indra/newview/app_settings/shaders/class1/windlight/moonV.glsl
@@ -3,7 +3,7 @@
  *
   * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2007, Linden Research, Inc.
+ * Copyright (C) 2007, 2020 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
@@ -30,8 +30,6 @@ uniform mat4 modelview_projection_matrix;
 ATTRIBUTE vec3 position;
 ATTRIBUTE vec2 texcoord0;
 
-void calcAtmospherics(vec3 inPositionEye);
-
 VARYING vec2 vary_texcoord0;
 
 void main()
@@ -43,6 +41,4 @@ void main()
     gl_Position = modelview_projection_matrix*vert;
     
     vary_texcoord0 = (texture_matrix0 * vec4(texcoord0,0,1)).xy;
-    
-    calcAtmospherics(pos.xyz);
 }