extra diffuse sample in ssreflection to decrease aliasing.

1 files changed, 7 insertions, 2 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
index 503c7d0b83..3f4425a0b2 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl
@@ -298,13 +298,18 @@ void main()
 		// of the diffuse map.  LOD would be better in that regard.
 		// The goal of the blur is to soften reflections in surfaces
 		// with low shinyness, and also to disguise our lameness.
+		// ---------------------
+		//     ^   ^ ^ ^   ^
+		//     a . b o c . d    check=0:avg(a,b) check=1:avg(c,d)
 		float checkerboard = floor(mod(tc.x+tc.y, 2.0)); // 0.0, 1.0
-		ref2d += normalize(ref2d)*14.0*(1.0-spec.a)*(checkerboard-0.5);
+		vec2 checkoffset = normalize(ref2d)*5.0*(1.0-spec.a)*(checkerboard-0.5);
+		ref2d += checkoffset;
 		ref2d += tc.xy; // use as offset from destination
 		// get attributes from the 2D guess point
 		float refdepth = texture2DRect(depthMap, ref2d).a;
 		vec3 refpos = getPosition_d(ref2d, refdepth).xyz;
-		vec3 refcol = texture2DRect(diffuseRect, ref2d).rgb;
+		vec3 refcol = 0.5 * (texture2DRect(diffuseRect, ref2d).rgb +
+				     texture2DRect(diffuseRect, ref2d + checkoffset*2.0).rgb);
 		vec3 refn = normalize(texture2DRect(normalMap, ref2d).rgb * 2.0 - 1.0);
 		// figure out how appropriate our guess actually was
 		float refapprop = max(0.0, dot(-refnorm, normalize(pos - refpos)));