four corners webcam effect

1 files changed, 8 insertions, 0 deletions

diff --git a/webcam.html b/webcam.html
index bbdeda2..fb010a9 100644
--- a/webcam.html
+++ b/webcam.html
@@ -149,6 +149,14 @@ var SHADERS = [
       rgbpixel(d, p, x, y < h/2 ? y : h-y-1, w, h)
     }
   },
+  { name: "four-corners",
+    shader: function(d, p, x, y, w, h){
+      rgbpixel(d, p,
+        Math.round(Math.abs(w*(2*(x/w-0.5)))),
+        Math.round(Math.abs(h*(2*((y+0.5)/h-0.5)))),
+        w, h)
+    }
+  },
 ]
 
 function rgbpixel(d, p, x, y, w, h) {