Rejig deferred normal-map packing a little, to double its accuracy for free.

(transplanted from bf541483d9074c18c6d4f4bd19caf0de82013cbf)

1 files changed, 2 insertions, 1 deletions

diff --git a/indra/newview/app_settings/shaders/class2/deferred/blurLightF.glsl b/indra/newview/app_settings/shaders/class2/deferred/blurLightF.glsl
index 0fad5b4b50..d1c5d7cb19 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/blurLightF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/blurLightF.glsl
@@ -37,7 +37,8 @@ vec4 getPosition(vec2 pos_screen)
 
 void main() 
 {
-	vec3 norm = texture2DRect(normalMap, vary_fragcoord.xy).xyz*2.0-1.0;
+	vec3 norm = texture2DRect(normalMap, vary_fragcoord.xy).xyz;
+	norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
 	vec3 pos = getPosition(vary_fragcoord.xy).xyz;
 	vec4 ccol = texture2DRect(lightMap, vary_fragcoord.xy).rgba;