dom/canvas/test/webgl-conf/checkout/conformance/offscreencanvas/context-lost.html

   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 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  11 <script src="../../js/js-test-pre.js"></script>
  12 <script src="../../js/webgl-test-utils.js"></script>
  13 <script src="../../js/tests/canvas-tests-utils.js"></script>
  14 <script>
  15 function init()
  16 {
  17     description("Tests behavior under a lost context for OffscreenCanvas");
  18
  19     if (!window.OffscreenCanvas) {
  20       testPassed("No OffscreenCanvas support");
  21       finishTest();
  22       return;
  23     }
  24
  25     canvas = new OffscreenCanvas(10, 10);
  26     gl = canvas.getContext('webgl');
  27
  28     // call testValidContext() before checking for the extension, because this is where we check
  29     // for the isContextLost() method, which we want to do regardless of the extension's presence.
  30     if (!testValidContext()) {
  31         testFailed("Some tests failed");
  32         finishTest();
  33         return;
  34     }
  35
  36     WEBGL_lose_context = gl.getExtension("WEBGL_lose_context");
  37     // need an extension that exposes new API methods.
  38     OES_vertex_array_object = gl.getExtension("OES_vertex_array_object");
  39     if (WEBGL_lose_context == null || OES_vertex_array_object == null) {
  40         testFailed("extension && OES_vertex_array_object failed");
  41         finishTest();
  42         return;
  43     }
  44
  45     // We need to initialize |uniformLocation| before losing context.
  46     // Otherwise gl.getUniform() when context is lost will throw.
  47     uniformLocation = gl.getUniformLocation(program, "tex");
  48     WEBGL_lose_context.loseContext();
  49
  50     canvas.addEventListener("webglcontextlost", function() {
  51         if (testLostContextWithoutRestore()) {
  52             testPassed("All tests passed");
  53             finishTest();
  54             return;
  55         } else {
  56             testFailed("testLostContextWithoutRestore failed");
  57             finishTest();
  58             return;
  59         }
  60     }, false);
  61 }
  62
  63 </script>
  64 </head>
  65 <body onload="init()">
  66 <div id="description"></div>
  67 <div id="console"></div>
  68 </body>
  69 </html>