1 files changed, 10 insertions, 0 deletions
diff --git a/js/shader.js b/js/shader.js
index 81a1ec5..f0ed548 100644
--- a/js/shader.js
+++ b/js/shader.js
@@ -29,17 +29,27 @@ var shader = (function(){
   }
   exports.toggle = function(state){
     animating = typeof state == "boolean" ? state : ! animating
+    shader_fps_el.classList.toggle('hidden')
     return animating
   }
   exports.pause = function(){
     animating = false
+    shader_fps_el.classList.add('hidden')
+    shader.fps_time = 0
   }
   exports.play = function(){
     animating = true
+    shader_fps_el.classList.remove('hidden')
   }
   exports.animate = function (t){
     requestAnimationFrame(exports.animate)
     if (! animating) { return } 
+    if (shader.fps_time){
+      var ms = Date.now() - shader.fps_time
+      fps = 1000 / ms
+      shader_fps_el.innerHTML = (fps | 0) + ' fps'
+    }
+    shader.fps_time = Date.now()
     exports.run(canvas)
   }