get-extension.html

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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.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL Extension Conformance Tests</title>

<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>

</head>

<body>

<div id="description"></div>

<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>

<div id="console"></div>

<script>

"use strict";

var pseudoRandom = (function() {

    var seed = 3;

    return function() {

        seed = (seed * 11 + 17) % 25;

        return seed / 25;

};

})();

var randomizeCase = function(str) {

    var newChars = [];

    for (var ii = 0; ii < str.length; ++ii) {

        var c = str.substr(ii, 1);

        var m = (pseudoRandom() > 0.5) ? c.toLowerCase() : c.toUpperCase();

        newChars.push(m);

    return newChars.join("");

};

description();

var wtu = WebGLTestUtils;

var canvas = document.getElementById("canvas");

var gl = wtu.create3DContext(canvas);

var ii;

debug("check every extension advertised can be enabled");

debug("");

var extensionNames = gl.getSupportedExtensions();

var extensionNamesLower = [];

for (ii = 0; ii < extensionNames.length; ++ii) {

    extensionNamesLower.push(extensionNames[ii].toLowerCase());

for (ii = 0; ii < extensionNames.length; ++ii) {

    var originalName = extensionNames[ii];

    var mixedName = randomizeCase(originalName);

    var extension = gl.getExtension(mixedName);

    assertMsg(extension, "able to get " + originalName + " as " + mixedName);

    if (extension) {

        var kTestString = "this is a test";

        var kTestNumber = 123;

        var kTestFunction = function() { };

        var kTestObject = { };

        extension.testStringProperty = kTestString;

        extension.testNumberProperty = kTestNumber;

        extension.testFunctionProperty = kTestFunction;

        extension.testObjectProperty = kTestObject;

        webglHarnessCollectGarbage();

        var extension2 = gl.getExtension(originalName);

        assertMsg(

            extension === extension2,

            "calling getExtension twice for the same extension returns the same object");

        assertMsg(

            extension2.testStringProperty === kTestString &&

            extension2.testFunctionProperty === kTestFunction &&

            extension2.testObjectProperty === kTestObject &&

            extension2.testNumberProperty === kTestNumber,

            "object returned by 2nd call to getExtension has same properties");

        var prefixedVariants = wtu.getExtensionPrefixedNames(originalName);

        for (var jj = 0; jj < prefixedVariants.length; ++jj) {

            assertMsg(

                gl.getExtension(prefixedVariants[jj]) === null ||

                extensionNamesLower.indexOf(prefixedVariants[jj].toLowerCase()) !== -1,

                "getExtension('" + prefixedVariants[jj] + "') returns an object only if the name is returned by getSupportedExtensions");

    debug("");

var successfullyParsed = true;

</script>

<script src="../../js/js-test-post.js"></script>

</body>

</html>