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-rw-r--r--indra/newview/app_settings/shaders/class2/deferred/skyF.glsl16
1 files changed, 15 insertions, 1 deletions
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;
}