dom/canvas/test/webgl-conf/checkout/conformance2/context/context-mode.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
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>WebGL2 Canvas Context Mode Conformance Tests</title>
  12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  13 <script src="../../js/js-test-pre.js"></script>
  14 <script src="../../js/webgl-test-utils.js"></script>
  15 </head>
  16 <body>
  17 <div id="description"></div>
  18 <div id="console"></div>
  19 <script>
  20 "use strict";
  21 description("This test ensures WebGL 2.0 implementations respect the canvas's context mode.");
  22
  23 debug("");
  24
  25 assertMsg(window.WebGLRenderingContext,
  26           "WebGL2RenderingContext should be a member of window");
  27 assertMsg('WebGL2RenderingContext' in window,
  28           "WebGL2RenderingContext should be 'in' window");
  29
  30 function testContextMode(mode, altMode) {
  31   debug("Testing " + mode + " context type");
  32
  33   let c = document.createElement('canvas');
  34   c.width = 2;
  35   c.height = 2;
  36   let gl = c.getContext(mode);
  37   assertMsg(c.getContext(mode) == gl,
  38             "Canvas.getContext('" + mode + "') should return the same value every time");
  39   try {
  40     assertMsg(c.getContext(altMode) == null,
  41               "Canvas.getContext('" + altMode + "') after getContext('" + mode + "') should return null");
  42   } catch (e) {
  43     testFailed("Canvas.getContext('" + altMode + "') after getContext('" + mode + "') should not throw an exception");
  44   }
  45 }
  46
  47 testContextMode('webgl2', 'webgl');
  48 testContextMode('webgl', 'webgl2');
  49
  50 debug("");
  51 var successfullyParsed = true;
  52 </script>
  53 <script src="../../js/js-test-post.js"></script>
  54
  55 </body>
  56 </html>