dom/canvas/test/reftest/webgl-hanging-fb-test.html

   1 <!DOCTYPE html>
   2 <html class="reftest-wait">
   3 <head>
   4 <meta charset="UTF-8">
   5
   6 <script type="text/javascript" src="webgl-utils.js"></script>
   7 <script type="text/javascript">
   8 /* Hanging Framebuffer Test
   9  *
  10  * Clear the canvas to green, but create and bind a new framebuffer
  11  * before returning. This will fail if we blindly read from the bound
  12  * framebuffer, instead of binding to the screen and reading from that.
  13  *
  14  * How failure looks isn't well defined, since this is an empty framebuffer,
  15  * thus is incomplete, and should cause errors if it's read from.
  16  */
  17
  18 "use strict";
  19
  20 function renderGL(gl) {
  21   gl.clearColor(0.0, 1.0, 0.0, 1.0);
  22   gl.clear(gl.COLOR_BUFFER_BIT);
  23
  24   var fb = gl.createFramebuffer();
  25   gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  26
  27   gl.finish();
  28 }
  29
  30 function renderFailure(canvas) {
  31   // This will also trigger RAF for us.
  32   var context = canvas.getContext("2d");
  33   context.fillText('WebGL failed.', 64, 64);
  34 }
  35
  36 function runTest() {
  37   var canvas = document.getElementById("canvas");
  38   var gl = initGL(canvas);
  39
  40   if (gl)
  41     renderGL(gl);
  42   else
  43     renderFailure(canvas);
  44
  45   waitForComposite(testComplete);
  46 }
  47
  48 function testComplete() {
  49   document.documentElement.removeAttribute("class");
  50 }
  51 </script>
  52 </head>
  53
  54 <body onload="rAF(runTest);">
  55   <canvas id="canvas" width="256" height="256"></canvas>
  56 </body>
  57
  58 </html>