Support for non-DOM canvases/contexts (backed by bitaps).

samples/openglui/web/gl_driver.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library gl_driver;
 
-import 'dart:html';
 import '../src/gl.dart';
 
 /**
  * A driver to run GL applications in the browser.
  */
 
-bool is3d = false;
-
-void glMain(setup, resize, draw, onMotionDown) {
+void glMain(setup, resize, draw, [onMotionDown]) {
   // Setup a Canvas for GL to run inside.
-  final canvas = new CanvasElement(width: window.innerWidth,
-                                   height: window.innerHeight);
-  document.body.nodes.add(canvas);
-
-  // The first 'setup' entry point is called once.
+  final canvas = getDisplayCanvas(resize);
   setup(canvas, canvas.width, canvas.height);
 
   canvas.on.mouseDown.add((e) {
-    onMotionDown(0, 0, 0);
+    if (onMotionDown != null) {
+      onMotionDown(0, 0, 0);
+    }
   });
-  // The second 'render' entry point is called each time the canvas should
-  // be re-drawn.
-  var render;
-  render = (n) {
-    draw();
-    window.requestAnimationFrame(render);
-  };
-  render(0);
 
-  window.onResize.listen((e) {
-    canvas.width = window.innerWidth;
-    canvas.height = window.innerHeight;
-    resize(canvas.width, canvas.height);
-  });
+  animate(draw);
 }
+