test_offscreencanvas_many.html

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<!DOCTYPE HTML>

<html>

<head>

<title>WebGL in OffscreenCanvas</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

</head>

<body>

<!--

  This test needs several workers run offscreen canvas simultaneously.

  So we choose 8 workers, 4 of them run basic webgl drawing test and

  others run size changing test.

-->

<script>

SimpleTest.waitForExplicitFinish();

function createCanvas() {

  var htmlCanvas = document.createElement('canvas');

  htmlCanvas.width = 64;

  htmlCanvas.height = 64;

  document.body.appendChild(htmlCanvas);

  return htmlCanvas;

function runTest() {

  var stillRunning = 0;

  var startWorker = function(canvas, test) {

    stillRunning++;

    var worker = new Worker("offscreencanvas.js");

    worker.onmessage = function(evt) {

      var msg = evt.data || {};

      if (msg.type == "test") {

        ok(msg.result, msg.name);

      if (msg.type == "finish") {

        worker.terminate();

        if (--stillRunning == 0)

          SimpleTest.finish();

    var offscreenCanvas = canvas.transferControlToOffscreen();

    worker.postMessage({test, canvas: offscreenCanvas}, [offscreenCanvas]);

  /* create 4 workers that do the regular drawing test and 4 workers

     that do the size change test */

  for (var i = 0; i < 4; i++) {

    startWorker(createCanvas(), 'webgl');

  for (var i = 0; i < 4; i++) {

    startWorker(createCanvas(), 'webgl_changesize');

SpecialPowers.pushPrefEnv({'set': [

  ['webgl.force-enabled', true]

]}, runTest);

</script>

</body>

</html>