Experimentation with normalpacking and component precision.

indra/newview/app_settings/shaders/class1/deferred/treeF.glsl

@@ -37,6 +37,17 @@ VARYING vec2 vary_texcoord0;
 
 uniform float minimum_alpha;
 
+vec3 pack(vec3 norm)
+{
+//#define PACK_NORMALS
+#ifdef PACK_NORMALS
+	float p = sqrt(8.0*norm.z+8.0);
+	return vec3(norm.xy/p + 0.5, 0.0);
+#else
+	return norm.xyz*0.5+0.5;
+#endif
+}
+
 void main() 
 {
 	vec4 col = texture2D(diffuseMap, vary_texcoord0.xy);
@@ -48,5 +59,5 @@ void main()
 	frag_data[0] = vec4(vertex_color.rgb*col.rgb, 0.0);
 	frag_data[1] = vec4(0,0,0,0);
 	vec3 nvn = normalize(vary_normal);
-	frag_data[2] = vec4(nvn.xy * 0.5 + 0.5, nvn.z, 0.0);
+	frag_data[2] = vec4(pack(nvn),0.0);
 }