1 files changed, 14 insertions, 3 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
index eafb7d9c75..de9b2cd0d1 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/softenLightF.glsl
@@ -79,6 +79,17 @@ vec3 vary_AmblitColor;
 vec3 vary_AdditiveColor;
 vec3 vary_AtmosAttenuation;
 
+vec3 decode_normal (vec2 enc)
+{
+    vec2 fenc = enc*4-2;
+    float f = dot(fenc,fenc);
+    float g = sqrt(1-f/4);
+    vec3 n;
+    n.xy = fenc*g;
+    n.z = 1-f/2;
+    return n;
+}
+
 vec4 getPosition_d(vec2 pos_screen, float depth)
 {
 	vec2 sc = pos_screen.xy*2.0;
@@ -279,8 +290,8 @@ void main()
 	float depth = texture2DRect(depthMap, tc.xy).r;
 	vec3 pos = getPosition_d(tc, depth).xyz;
 	vec4 norm = texture2DRect(normalMap, tc);
-	norm.xyz = (norm.xyz-0.5)*2.0; // unpack norm
-		
+	float envIntensity = norm.z;
+	norm.xyz = decode_normal(norm.xy);
 	float da = max(dot(norm.xyz, sun_dir.xyz), 0.0);
 	da = pow(da, 0.7);
 
@@ -320,7 +331,7 @@ void main()
 			//add environmentmap
 			vec3 env_vec = env_mat * refnormpersp;
 			col = mix(col.rgb, textureCube(environmentMap, env_vec).rgb, 
-				max(norm.a-diffuse.a*2.0, 0.0)); 
+				max(envIntensity-diffuse.a*2.0, 0.0)); 
 		}
 			
 		col = atmosLighting(col);