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<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
<script src="../../js/tests/canvas-tests-utils.js"></script>
<script>
function init()
{
description("Tests behavior under a lost context for OffscreenCanvas");
if (!window.OffscreenCanvas) {
testPassed("No OffscreenCanvas support");
finishTest();
return;
}
canvas = new OffscreenCanvas(10, 10);
gl = canvas.getContext('webgl');
// call testValidContext() before checking for the extension, because this is where we check
// for the isContextLost() method, which we want to do regardless of the extension's presence.
if (!testValidContext()) {
testFailed("Some tests failed");
finishTest();
return;
}
WEBGL_lose_context = gl.getExtension("WEBGL_lose_context");
// need an extension that exposes new API methods.
OES_vertex_array_object = gl.getExtension("OES_vertex_array_object");
if (WEBGL_lose_context == null || OES_vertex_array_object == null) {
testFailed("extension && OES_vertex_array_object failed");
finishTest();
return;
}
// We need to initialize |uniformLocation| before losing context.
// Otherwise gl.getUniform() when context is lost will throw.
uniformLocation = gl.getUniformLocation(program, "tex");
WEBGL_lose_context.loseContext();
canvas.addEventListener("webglcontextlost", function() {
if (testLostContextWithoutRestore()) {
testPassed("All tests passed");
finishTest();
return;
} else {
testFailed("testLostContextWithoutRestore failed");
finishTest();
return;
}
}, false);
}
</script>
</head>
<body onload="init()">
<div id="description"></div>
<div id="console"></div>
</body>
</html>