De-duplicate shader code for encoding and decoding normals to/from gbuffer format.

1 files changed, 11 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class1/environment/decodeNormF.glsl b/indra/newview/app_settings/shaders/class1/environment/decodeNormF.glsl
new file mode 100644
index 0000000000..0abb1e43db
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/environment/decodeNormF.glsl
@@ -0,0 +1,11 @@
+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;
+}
+