<!--
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.
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<!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 restored context for OffscreenCanvas.");

    if (!window.OffscreenCanvas) {
      testPassed("No OffscreenCanvas support");
      finishTest();
      return;
    }

    if (!setupTest()) {
        testFailed("Cannot initialize test");
        finishTest();
        return;
    }

    canvas.addEventListener("webglcontextlost", function(e) {
        if (!testLostContext(e)) {
            testFailed("Some test failed");
            finishTest();
            return;
        }
        // restore the context after this event has exited.
        setTimeout(function() {
            // we didn't call prevent default so we should not be able to restore the context
            if (!compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()")) {
                testFailed("Some test failed");
                finishTest();
                return;
            }
            testLosingAndRestoringContext().then(function() {
                testPassed("Test passed");
                finishTest();
                return;
            }, function() {
                testFailed("Some test failed");
                finishTest();
                return;
            });
       }, 0);
    });
    canvas.addEventListener("webglcontextrestored", function() {
        testFailed("Some test failed");
        finishTest();
        return;
    });
    allowRestore = false;
    contextLostEventFired = false;
    contextRestoredEventFired = false;

    if (!testOriginalContext()) {
        testFailed("Some test failed");
        finishTest();
        return;
    }
    WEBGL_lose_context.loseContext();
    // The context should be lost immediately.
    shouldBeTrue("gl.isContextLost()");
    shouldBe("gl.getError()", "gl.CONTEXT_LOST_WEBGL");
    shouldBe("gl.getError()", "gl.NO_ERROR");
    // gl methods should be no-ops
    shouldBeTrue(compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)"));
    // but the event should not have been fired.
    shouldBeFalse("contextLostEventFired");
}

</script>
</head>
<body onload="init()">
<div id="description"></div>
<div id="console"></div>
</body>
</html>
