1 files changed, 12 insertions, 1 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
index bac74cbbef..1470239a71 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
@@ -49,6 +49,17 @@ VARYING vec2 vary_fragcoord;
 uniform mat4 inv_proj;
 uniform vec2 screen_res;
 
+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(vec2 pos_screen)
 {
 	float depth = texture2DRect(depthMap, pos_screen.xy).r;
@@ -123,7 +134,7 @@ void main()
 	vec4 pos = getPosition(pos_screen);
 	
 	vec3 norm = texture2DRect(normalMap, pos_screen).xyz;
-	norm = (norm.xyz-0.5)*2.0; // unpack norm
+	norm = decode_normal(norm.xy);
 		
 	frag_color[0] = 1.0;
 	frag_color[1] = calcAmbientOcclusion(pos, norm);