--- 
+++ 
@@ -91,7 +91,14 @@
 
 function init(_stage) {
     var sizes = getsizes();
-    renderer = PIXI.autoDetectRenderer(sizes.width, sizes.height);
+    if (getParameterByName('webgl') == '') {
+        renderer = PIXI.autoDetectRenderer(sizes.width, sizes.height);
+    } else if (Number(getParameterByName('webgl')) == 0) {
+        renderer = new PIXI.CanvasRenderer(sizes.width, sizes.height);
+    } else {
+        renderer = new PIXI.WebGLRenderer(sizes.width, sizes.height);
+    }
+
     document.body.appendChild(renderer.view);
     stage = _stage;
     window.onresize = resize;