NORSPEC-246 WIP fix handling of encoded normals with single FP only cards

1 files changed, 36 insertions, 10 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
index 1470239a71..7fcbb1aa85 100755
--- a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
@@ -49,16 +49,42 @@ 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;
-}
+#ifdef SINGLE_FP_ONLY

+vec2 encode_normal(vec3 n)

+{

+	float f = sqrt(2 * n.z + 2);

+	return (n.xy / vec2(f)) + vec2(0.5f);

+}

+

+vec3 decode_normal (vec2 enc)

+{

+    vec2 fenc = enc - 0.5f;

+    float f = dot(fenc,fenc);

+    f = clamp(f,0.0f,1.0f);

+    float g = sqrt(1-f);

+    vec3 n;

+    n.xy = fenc*g;

+    n.z = 1.0f - (f * 0.5f);

+    return normalize(n);

+}

+#else

+vec2 encode_normal(vec3 n)

+{

+	float f = sqrt(8 * n.z + 8);

+	return n.xy / f + 0.5;

+}

+

+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;

+}

+#endif
 
 vec4 getPosition(vec2 pos_screen)
 {