Linearize light source colors, and a bit of cook torrance fanciness.

1 files changed, 12 insertions, 4 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
index fa1572e692..03b036375b 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/pointLightF.glsl
@@ -107,12 +107,20 @@ void main()
 	vec4 spec = texture2DRect(specularRect, frag.xy);
 	if (spec.a > 0.0)
 	{
-		float sa = dot(normalize(lv-normalize(pos)),norm);
-		spec.rgb += pow(1 - dot(-normalize(pos), norm), 2) * da * 3;
+		vec3 npos = -normalize(pos);
+		vec3 h = normalize(lv+npos);
+		float nh = dot(norm, h);
+		float nv = dot(norm, npos);
+		float vh = dot(npos, h);
+		float sa = nh;
+		vec3 fres = spec.rgb + pow(1 - dot(h, npos), 5) * (1 - spec.rgb);
+		float gtdenom = 2 * nh;
+		float gt = max(0,(min(gtdenom * nv / vh, gtdenom * da / vh)));
+
 		if (sa > 0.0)
 		{
-			sa = texture2D(lightFunc, vec2(sa, spec.a)).r * min(dist_atten*4.0, 1.0);
-			col += da*sa*color.rgb*spec.rgb;
+			vec3 scol = (fres * texture2D(lightFunc, vec2(nh, spec.a)).r * gt) / (nh * da);
+			col += lit*scol*color.rgb;
 		}
 	}