Use old smoothing function and cleanup

Author: lenemter

data/gala.gresource.xml

@@ -23,7 +23,6 @@
   <gresource prefix="/io/elementary/desktop/gala">
     <file compressed="true">shaders/colorblindness-correction.vert</file>
     <file compressed="true">shaders/monochrome.vert</file>
-    <file compressed="true">shaders/rounded-corners.vert</file>
   </gresource>
   <gresource prefix="/io/elementary/desktop/gala-daemon">
     <file compressed="true">gala-daemon.css</file>

data/shaders/rounded-corners.vert

@@ -71,8 +71,7 @@ public class Gala.RoundedCornersEffect : Clutter.OffscreenEffect {
                 }
 
                 // Only pixels on the edge of the curve need expensive antialiasing
-                // return smoothstep (outer_radius, inner_radius, sqrt (dist_squared));
-                return outer_radius - sqrt (dist_squared);
+                return smoothstep (outer_radius, inner_radius, sqrt (dist_squared));
             }
             """,
             null
@@ -152,7 +151,7 @@ public class Gala.RoundedCornersEffect : Clutter.OffscreenEffect {
         var height = box.y2 - box.y1;
         width = Math.nearbyintf (width);
         height = Math.nearbyintf (height);
- 
+
         box.x2 = Math.ceilf (box.x2 + 0.75f);
         box.y2 = Math.ceilf (box.y2 + 0.75f);