dom/canvas/test/webgl-conf/checkout/conformance/offscreencanvas/context-lost-restored.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
  16 function init()
  17 {
  18     description("Tests behavior under a restored context for OffscreenCanvas.");
  19
  20     if (!window.OffscreenCanvas) {
  21       testPassed("No OffscreenCanvas support");
  22       finishTest();
  23       return;
  24     }
  25
  26     if (!setupTest()) {
  27         testFailed("Cannot initialize test");
  28         finishTest();
  29         return;
  30     }
  31
  32     canvas.addEventListener("webglcontextlost", function(e) {
  33         if (!testLostContext(e)) {
  34             testFailed("Some test failed");
  35             finishTest();
  36             return;
  37         }
  38         // restore the context after this event has exited.
  39         setTimeout(function() {
  40             // we didn't call prevent default so we should not be able to restore the context
  41             if (!compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()")) {
  42                 testFailed("Some test failed");
  43                 finishTest();
  44                 return;
  45             }
  46             testLosingAndRestoringContext().then(function(s) {
  47                 testPassed("Test passed");
  48                 finishTest();
  49                 return;
  50             }, function(s) {
  51                 testFailed("Test failed: " + s);
  52                 finishTest();
  53                 return;
  54             });
  55        }, 0);
  56     });
  57     canvas.addEventListener("webglcontextrestored", function() {
  58         testFailed("Some test failed");
  59         finishTest();
  60         return;
  61     });
  62     allowRestore = false;
  63     contextLostEventFired = false;
  64     contextRestoredEventFired = false;
  65
  66     if (!testOriginalContext()) {
  67         testFailed("Some test failed");
  68         finishTest();
  69         return;
  70     }
  71     WEBGL_lose_context.loseContext();
  72     // The context should be lost immediately.
  73     shouldBeTrue("gl.isContextLost()");
  74     shouldBe("gl.getError()", "gl.CONTEXT_LOST_WEBGL");
  75     shouldBe("gl.getError()", "gl.NO_ERROR");
  76     // gl methods should be no-ops
  77     shouldBeTrue(compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)"));
  78     // but the event should not have been fired.
  79     shouldBeFalse("contextLostEventFired");
  80 }
  81
  82 </script>
  83 </head>
  84 <body onload="init()">
  85 <div id="description"></div>
  86 <div id="console"></div>
  87 </body>
  88 </html>