Merge branch 'master' into DRTVWR-540-maint

4 files changed, 19 insertions, 8 deletions

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);