tor-browser

The Tor Browser
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offscreencanvas-query.html (2457B)

      1 <!--
      2 Copyright (c) 2019 The Khronos Group Inc.
      3 Use of this source code is governed by an MIT-style license that can be
      4 found in the LICENSE.txt file.
      5 -->
      6 <!DOCTYPE html>
      7 <html>
      8 <head>
      9 <meta charset="utf-8">
     10 <title>Test for Query objects with OffscreenCanvas</title>
     11 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
     12 <script src="../../js/js-test-pre.js"></script>
     13 <script src="../../js/webgl-test-utils.js"></script>
     14 </head>
     15 <body>
     16  <div id="description"></div>
     17  <div id="console"></div>
     18  <script id='myWorker' type='text/worker'>
     19  function tick(callback) {
     20      function tickImpl() {
     21          const res = callback();
     22          if (res) {
     23              if (requestAnimationFrame) {
     24                  requestAnimationFrame(tickImpl);
     25              } else {
     26                  setTimeout(tickImpl, 10);
     27              }
     28          }
     29      }
     30 
     31      tickImpl();
     32  }
     33 
     34  self.onmessage = function(e) {
     35      let canvas = new OffscreenCanvas(128, 128);
     36      let gl = canvas.getContext("webgl2");
     37      let query = gl.createQuery();
     38      gl.beginQuery(gl.ANY_SAMPLES_PASSED_CONSERVATIVE, query);
     39      gl.endQuery(gl.ANY_SAMPLES_PASSED_CONSERVATIVE);
     40      gl.clearColor(0.0, 1.0, 0.0, 1.0);
     41      gl.clear(gl.COLOR_BUFFER_BIT);
     42      tick(function() {
     43          const status = gl.getQueryParameter(query, gl.QUERY_RESULT_AVAILABLE);
     44          if (status) {
     45              self.postMessage("PASSED - query object completed successfully from worker");
     46              return false;
     47          } else {
     48              const err = gl.getError();
     49              if (err != 0) {
     50                  self.postMessage("FAILED - GL error " + err);
     51                  return false;
     52              }
     53          }
     54          return true;
     55      });
     56  };
     57  </script>
     58  <script>
     59    "use strict";
     60    description("This test ensures that query objects work with the WebGL 2.0 context created via OffscreenCanvas.");
     61    if (!window.OffscreenCanvas) {
     62        testPassed("No OffscreenCanvas support");
     63        finishTest();
     64    } else {
     65      var blob = new Blob([document.getElementById("myWorker").textContent]);
     66      var worker = new Worker(URL.createObjectURL(blob));
     67      worker.onmessage = function(msg) {
     68          if (msg.data.startsWith("PASSED")) {
     69              testPassed(msg.data);
     70          } else {
     71              testFailed(msg.data);
     72          }
     73          finishTest();
     74      }
     75      worker.postMessage("Start Worker");
     76    }
     77  </script>
     78 </body>
     79 </html>