Repository: CesiumGS/webglreport
Branch: main
Commit: c84c8d04cf1c
Files: 9
Total size: 61.5 KB

Directory structure:
gitextract_6ks92vk1/

├── .gitignore
├── .project
├── CNAME
├── LICENSE.md
├── README.md
├── black.css
├── images/
│   └── ForkMe_Ribbons/
│       └── README.txt
├── index.html
└── webglreport.js

================================================
FILE CONTENTS
================================================

================================================
FILE: .gitignore
================================================
.DS_Store*


================================================
FILE: .project
================================================
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>WebGL Report</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
	</buildSpec>
	<natures>
	</natures>
</projectDescription>


================================================
FILE: CNAME
================================================
webglreport.com

================================================
FILE: LICENSE.md
================================================
Copyright 2011-2017 Analytical Graphics, Inc. and Contributors

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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   Copyright 2011-2017 Analytical Graphics, Inc. and Contributors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

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   See the License for the specific language governing permissions and
   limitations under the License.


================================================
FILE: README.md
================================================
What WebGL capabilities does your system support?  See [webglreport.com](https://webglreport.com)

<a href="https://webglreport.com"><img src="https://f.cloud.github.com/assets/782098/1811414/b24620a4-6e53-11e3-9f72-576bb8fbb1f0.png" /></a>


================================================
FILE: black.css
================================================
a, a:link, a:visited {
    color: #218bb0;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

a img {
    border: none;
}

h1 {
    color: white;
    text-align: center;
    font-family: arial, Sans-Serif;
    font-size: 26pt;
}

body {
    font-family: arial, Sans-Serif;
    font-size: 16px;
    color: white;
    background-image: url(images/mtimoon_fromSTK_3d.jpg);
    background-position: right top;
    background-repeat: no-repeat;
    background-color: black;
    margin: 0px;
}

.align-center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.main-output {
    position: relative;
    margin-left: auto;
    margin-right: auto;
    width: 700px;
    text-align: center;
}

.main-left-column {
    width: 190px;
}

.webglVersionTabs {
    text-align: left;
    padding-left: 4px;
    font-size: 20px;
}

.webglVersionTabs a,
.webglVersionTabs a:visited {
    display: inline-block;
    background-color: #ddd;
    padding: 5px 10px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    vertical-align: bottom;
    color: #218bb0;
}

.webglVersionTabs a.active,
.webglVersionTabs a.active:visited {
    background-color: #00A900;
    color: #FFF;
    padding: 8px 15px;
}

.warn .webglVersionTabs a.active,
.warn .webglVersionTabs a.active:visited {
    background-color: #A90000;
    color: #FFF;
}

.header {
    background: #00A900;
    overflow: hidden;
    margin-bottom: 8px;
    padding: 0 5px;
}

.warn .header {
    background: #A90000;
}

.header a,
.header a:visited,
.warn .header a,
.warn .header a:visited {
    color: #42CEFF;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.report {
    position: relative;
    width: 100%;
    color: black;
    box-sizing: border-box;
    font-size: 12px;
    text-align: left;
    border-style: ridge;
    border-width: 3px;
    padding: 6px;
    border-color: #AFC7C7;
    background-color: #FFFFFF;
}

.report > table {
    width: 700px;
}

td, th {
    text-align: left;
    vertical-align: top;
}

th {
    font-weight: bold;
}

.pipeline {
    width: 660px;
    height: 660px;
    color: white;
    position: relative;
}

.webgl2 .pipeline {
    height: 730px;
}

.pipeline table {
    width: 100%;
}

.pipeline .vertexShader,
.pipeline .transformFeedback,
.pipeline .rasterizer,
.pipeline .fragmentShader,
.pipeline .framebuffer,
.pipeline .textures,
.pipeline .uniformBuffers {
    position: absolute;
    width: 265px;
}

.pipeline h1 {
    font-size: 2em;
    margin: 0px;
}

.pipeline .vertexShader {
    top: 10px;
    left: 5px;
}

.pipeline .transformFeedback {
    top: 10px;
    left: 360px;
}

.pipeline .rasterizer {
    top: 220px;
    left: 5px;
}

.webgl2 .pipeline .rasterizer {
    top: 320px;
}

.pipeline .fragmentShader {
    top: 335px;
    left: 5px;
}

.webgl2 .pipeline .fragmentShader {
    top: 435px;
}

.pipeline .framebuffer {
    top: 520px;
    left: 5px;
}

.webgl2 .pipeline .framebuffer {
    top: 550px;
    left: 360px;
}

.pipeline .textures {
    top: 140px;
    left: 360px;
}

.webgl2 .pipeline .textures {
    top: 150px;
}

.pipeline .uniformBuffers {
    top: 300px;
    left: 360px;
}

.webgl2 .pipeline .uniformBuffers {
    top: 345px;
}

.pipeline a,
.pipeline a:visited {
    color: #fff;
}

a.extension {
    font-family: "Courier New", monospace;
}

a.unsupported {
    color: rgb(200, 200, 200);
}

.comingSoon {
    text-align: center;
    padding: 10px;
}

@media only screen and (min-width:1470px) {
    .main-output {
        width: 1365px;
    }
    .report {
        min-height: 680px;
    }
    .webgl2 .report {
        min-height: 750px;
    }
    .warn .report {
        min-height: 0;
    }
    .pipeline {
        position: absolute;
        top: 5px;
        right: 0;
    }
}


================================================
FILE: images/ForkMe_Ribbons/README.txt
================================================
GitHub loves third party developers. We want to help make your project awesome, and often that includes showing off GitHub integration with an image. In order to keep everyone happy (and avoid involving lawyers), we've created this repository and filled it with artwork that you may use in your own applications.

For help or to add media not included here, please email support@github.com and we'll talk.


THESE THINGS ARE AWESOME, PLEASE DO THEM:

+ Use the Octocat or GitHub logo to link to your GitHub profile (or GitHub)

+ Use the Octocat or GitHub logo to advertise that your product has built-in GitHub integration

+ Use the Octocat or GitHub logo in a blog post or news article about GitHub


PLEASE, DON"T DO THESE THINGS:

- Use the Octocat or GitHub logo for your application's icon

- Create a modified version of the Octocat or GitHub logo

- Integrate the Octocat or GitHub logo into your logo

- Use any GitHub artwork without permission


NAMING YOUR APPLICATION

Please avoid naming your projects anything that implies GitHub's endorsement. For example, don't call your awesome new iPhone app "GitHub Issues". Instead consider "Octoissues" or "HubIssues" or "Gissues". Maybe not that last one, but you get the idea.

================================================
FILE: index.html
================================================
<!DOCTYPE html>
<html lang="en">
<head>
    <title>WebGL Report</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <meta name="viewport" content="width=725, user-scalable=yes">
    <link rel="stylesheet" type="text/css" href="black.css">
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.1/underscore-min.js"></script>
    <script type="text/javascript" src="webglreport.js"></script>
</head>
<body>
    <script type="text/template" id="reportTemplate">
        <div class="report"><table>
            <tr>
                <th class="main-left-column">Platform:</th>
                <td><%= report.platform %></td>
            </tr>
            <tr>
                <th>Browser User Agent:</th>
                <td><%= report.userAgent %></td>
            </tr>
            <% if (typeof report.contextName !== 'undefined') { %>
            <tr>
                <th>Context Name:</th>
                <td><%= report.contextName %></td>
            </tr>
            <tr>
                <th>GL Version:</th>
                <td><%= report.glVersion %></td>
            </tr>
            <tr>
                <th>Shading Language Version:</th>
                <td><%= report.shadingLanguageVersion %></td>
            </tr>
            <tr>
                <th>Vendor:</th>
                <td><%= report.vendor %></td>
            </tr>
            <tr>
                <th>Renderer:</th>
                <td><%= report.renderer %></td>
            </tr>
            <% if (report.unMaskedVendor !== '') { %>
            <tr>
                <th>Unmasked Vendor:</th>
                <td><%= report.unMaskedVendor %></td>
            </tr>
            <% } %>
            <% if (report.unMaskedRenderer !== '') { %>
            <tr>
                <th>Unmasked Renderer:</th>
                <td><%= report.unMaskedRenderer %></td>
            </tr>
            <% } %>
            <tr>
                <th>Antialiasing:</th>
                <td><%= report.antialias %></td>
            </tr>
            <tr>
                <th>ANGLE:</th>
                <td><%= report.angle %></td>
            </tr>
            <tr>
                <th>Major Performance Caveat:</th>
                <td><%= report.majorPerformanceCaveat %></td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="pipeline">
                        <canvas class="background"></canvas>
                        <div class="vertexShader">
                            <h1>Vertex Shader</h1>
                            <table>
                                <tr title="Minimum: 8">
                                    <th>Max Vertex Attributes:</th>
                                    <td><%= report.maxVertexAttributes %></td>
                                </tr>
                                <tr title="Minimum: 128">
                                    <th>Max Vertex Uniform Vectors:</th>
                                    <td><%= report.maxVertexUniformVectors %></td>
                                </tr>
                                <tr title="Minimum: 0">
                                    <th>Max Vertex Texture Image Units:</th>
                                    <td><%= report.maxVertexTextureImageUnits %></td>
                                </tr>
                                <tr title="Minimum: 8">
                                    <th>Max Varying Vectors:</th>
                                    <td><%= report.maxVaryingVectors %></td>
                                </tr>
                                <tr>
                                    <th>Best float precision:</th>
                                    <td><%= report.vertexShaderBestPrecision %></td>
                                </tr>
                                <% if (report.webglVersion > 1) { %>
                                <tr>
                                    <th>Max Vertex Uniform Components:</th>
                                    <td><%= report.maxVertexUniformComponents %></td>
                                </tr>
                                <tr>
                                    <th>Max Vertex Uniform Blocks:</th>
                                    <td><%= report.maxVertexUniformBlocks %></td>
                                </tr>
                                <tr>
                                    <th>Max Vertex Output Components:</th>
                                    <td><%= report.maxVertexOutputComponents %></td>
                                </tr>
                                <tr>
                                    <th>Max Varying Components:</th>
                                    <td><%= report.maxVaryingComponents %></td>
                                </tr>
                                <% } %>
                            </table>
                        </div>
                        <div class="transformFeedback">
                            <h1>Transform Feedback</h1>
                            <% if (report.webglVersion < 2) { %>
                            <div class="comingSoon">
                                Coming in <a href="https://www.khronos.org/registry/webgl/specs/latest/2.0/">WebGL 2</a>
                            </div>
                            <% } else { %>
                            <table>
                                <tr>
                                    <th>Max Interleaved Components:</th>
                                    <td><%= report.maxTransformFeedbackInterleavedComponents %></td>
                                </tr>
                                <tr>
                                    <th>Max Separate Attribs:</th>
                                    <td><%= report.maxTransformFeedbackSeparateAttribs %></td>
                                </tr>
                                <tr>
                                    <th>Max Separate Components:</th>
                                    <td><%= report.maxTransformFeedbackSeparateComponents %></td>
                                </tr>
                            </table>
                            <% } %>
                        </div>
                        <div class="rasterizer">
                            <h1>Rasterizer</h1>
                            <table>
                                <tr title="Minimum: [1, 1]">
                                    <th>Aliased Line Width Range:</th>
                                    <td><%= report.aliasedLineWidthRange %></td>
                                </tr>
                                <tr title="Minimum: [1, 1]">
                                    <th>Aliased Point Size Range:</th>
                                    <td><%= report.aliasedPointSizeRange %></td>
                                </tr>
                            </table>
                        </div>
                        <div class="fragmentShader">
                            <h1>Fragment Shader</h1>
                            <table>
                                <tr title="Minimum: 16">
                                    <th>Max Fragment Uniform Vectors:</th>
                                    <td><%= report.maxFragmentUniformVectors %></td>
                                </tr>
                                <tr title="Minimum: 8">
                                    <th>Max Texture Image Units:</th>
                                    <td><%= report.maxTextureImageUnits %></td>
                                </tr>
                                <tr>
                                    <th>float/int precision:</th>
                                    <td><%= report.fragmentShaderFloatIntPrecision %></td>
                                </tr>
                                <tr>
                                    <th>Best float precision:</th>
                                    <td><%= report.fragmentShaderBestPrecision %></td>
                                </tr>
                                <% if (report.webglVersion > 1) { %>
                                <tr>
                                    <th>Max Fragment Uniform Components:</th>
                                    <td><%= report.maxFragmentUniformComponents %></td>
                                </tr>
                                <tr>
                                    <th>Max Fragment Uniform Blocks:</th>
                                    <td><%= report.maxFragmentUniformBlocks %></td>
                                </tr>
                                <tr>
                                    <th>Max Fragment Input Components:</th>
                                    <td><%= report.maxFragmentInputComponents %></td>
                                </tr>
                                <tr>
                                    <th>Min Program Texel Offset:</th>
                                    <td><%= report.minProgramTexelOffset %></td>
                                </tr>
                                <tr>
                                    <th>Max Program Texel Offset:</th>
                                    <td><%= report.maxProgramTexelOffset %></td>
                                </tr>
                                <% } %>
                            </table>
                        </div>
                        <div class="framebuffer">
                            <h1>Framebuffer</h1>
                            <table>
                                <% if (report.webglVersion > 1) { %>
                                <tr>
                                    <th>Max Draw Buffers:</th>
                                    <td><%= report.maxDrawBuffers %></td>
                                </tr>
                                <tr>
                                    <th>Max Color Attachments:</th>
                                    <td><%= report.maxColorAttachments %></td>
                                </tr>
                                <tr>
                                    <th>Max Samples:</th>
                                    <td><%= report.maxSamples %></td>
                                </tr>
                                <% } else { %>
                                <tr>
                                    <th>Max Color Buffers:</th>
                                    <td><%= report.maxColorBuffers %></td>
                                </tr>
                                <% } %>
                                <tr>
                                    <th>RGBA Bits:</th>
                                    <td>[<%= report.redBits %>, <%= report.greenBits %>, <%= report.blueBits %>, <%= report.alphaBits %>]</td>
                                </tr>
                                <tr>
                                    <th>Depth / Stencil Bits:</th>
                                    <td>[<%= report.depthBits %>, <%= report.stencilBits %>]</td>
                                </tr>
                                <tr>
                                    <th>Max Render Buffer Size:</th>
                                    <td><%= report.maxRenderBufferSize %></td>
                                </tr>
                                <tr>
                                    <th>Max Viewport Dimensions:</th>
                                    <td><%= report.maxViewportDimensions %></td>
                                </tr>
                            </table>
                        </div>
                        <div class="textures">
                            <h1>Textures</h1>
                            <table>
                                <tr title="Minimum: 64">
                                    <th>Max Texture Size:</th>
                                    <td><%= report.maxTextureSize %></td>
                                </tr>
                                <tr title="Minimum: 16">
                                    <th>Max Cube Map Texture Size:</th>
                                    <td><%= report.maxCubeMapTextureSize %></td>
                                </tr>
                                <tr title="Minimum: 8">
                                    <th>Max Combined Texture Image Units:</th>
                                    <td><%= report.maxCombinedTextureImageUnits %></td>
                                </tr>
                                <tr title="Minimum: 2">
                                    <th>Max Anisotropy:</th>
                                    <td><%= report.maxAnisotropy %></td>
                                </tr>
                                <% if (report.webglVersion > 1) { %>
                                <tr>
                                    <th>Max 3D Texture Size:</th>
                                    <td><%= report.max3dTextureSize %></td>
                                </tr>
                                <tr>
                                    <th>Max Array Texture Layers:</th>
                                    <td><%= report.maxArrayTextureLayers %></td>
                                </tr>
                                <tr>
                                    <th>Max Texture LOD Bias:</th>
                                    <td><%= report.maxTextureLodBias %></td>
                                </tr>
                                <% } %>
                            </table>
                        </div>
                        <div class="uniformBuffers">
                            <h1>Uniform Buffers</h1>
                            <% if (report.webglVersion < 2) { %>
                            <div class="comingSoon">
                                Coming in <a href="https://www.khronos.org/registry/webgl/specs/latest/2.0/">WebGL 2</a>
                            </div>
                            <% } else { %>
                            <table>
                                <tr>
                                    <th>Max Uniform Buffer Bindings:</th>
                                    <td><%= report.maxUniformBufferBindings %></td>
                                </tr>
                                <tr>
                                    <th>Max Uniform Block Size:</th>
                                    <td><%= report.maxUniformBlockSize %></td>
                                </tr>
                                <tr>
                                    <th>Uniform Buffer Offset Alignment:</th>
                                    <td><%= report.uniformBufferOffsetAlignment %></td>
                                </tr>
                                <tr>
                                    <th>Max Combined Uniform Blocks:</th>
                                    <td><%= report.maxCombinedUniformBlocks %></td>
                                </tr>
                                <tr>
                                    <th>Max Combined Vertex Uniform Components:</th>
                                    <td><%= report.maxCombinedVertexUniformComponents %></td>
                                </tr>
                                <tr>
                                    <th>Max Combined Fragment Uniform Components:</th>
                                    <td><%= report.maxCombinedFragmentUniformComponents %></td>
                                </tr>
                            </table>
                            <% } %>
                        </div>
                    </div>
                </td>
            </tr>
            <tr>
                <th colspan="2">Supported Extensions:</th>
            </tr>
            <% _.each(report.extensions, function(e) { %>
                <tr>
                    <td></td>
                    <td>
                        <a class="extension" href="<%= getExtensionUrl(e) %>"><%= e %></a>
                    </td>
                </tr>
            <% }) %>
            <tr>
                <td colspan="2">
                    <br />
                    <%= report.draftExtensionsInstructions %>
                </td>
            </tr>
            <% if (report.webglVersion === 2) { %>
            <tr>
                <th colspan="2"><br /><a href="https://www.khronos.org/registry/webgl/specs/latest/2.0/">WebGL 2</a> Functions Implementation Status:</th>
            </tr>
            <tr>
                <td></td>
                <td>
                    <p><%= report.webgl2Status %></p>
                </td>
            </tr>
            <% _.each(report.webgl2Functions, function(e) { %>
                <tr>
                    <td></td>
                    <td>
                        <a class="<%= e.className %>" href="<%= getWebGL2ExtensionUrl(e.name) %>"><%= e.name %></a>
                    </td>
                </tr>
            <% }); %>
            <% } %>
            <% } %>
        </table></div>
    </script>

    <script type="text/template" id="webglSupportedTemplate">
        <div class="header">
            <p>&#x2713; This browser supports WebGL <%= report.webglVersion %></p>
        </div>
    </script>

    <script type="text/template" id="webglSupportedChromeFrameTemplate">
        <div class="header">
            <p>&#x2713; This browser supports WebGL <%= report.webglVersion %> with Chrome Frame.</p>
        </div>
    </script>

    <script type="text/template" id="webglNotSupportedTemplate">
        <div class="header">
            <p>&times; This browser does not support WebGL <%= report.webglVersion %></p>
            <% if (report.webglVersion === 2 && report.userAgent.indexOf('Firefox') !== -1) { %>
            <p>
                To enable WebGL 2 in Firefox, see <a href="https://wiki.mozilla.org/Platform/GFX/WebGL2">https://wiki.mozilla.org/Platform/GFX/WebGL2</a>.
            </p>
            <% } else { %>
            <p>
                Check out <a href="http://get.webgl.org/">Get WebGL</a>,
                or try installing the latest version of
                <a href="https://www.google.com/chrome">Chrome</a>, or
                <a href="https://www.mozilla.org/en-US/firefox/">Firefox</a>.
            </p>
            <% } %>
        </div>
    </script>

    <script type="text/template" id="webglNotEnabledTemplate">
        <div class="header">
            <p>&times; This browser supports WebGL <%= report.webglVersion %>, but it is disabled or unavailable.</p>
            <p>Sometimes this is the result of older video drivers being rejected by the browser.  Try updating your video drivers if possible.</p>
            <p>
                Also check out <a href="http://get.webgl.org/">Get WebGL</a>,
                or try installing the latest version of
                <a href="https://www.google.com/chrome">Chrome</a>, or
                <a href="https://www.mozilla.org/en-US/firefox/">Firefox</a>.
            </p>
        </div>
    </script>

    <script type="text/template" id="webglVersionTabs">
        <div class="webglVersionTabs">
            <a href="?v=1" class="<%= report.webglVersion === 1 ? 'active' : '' %>">WebGL 1</a>
            <a href="?v=2" class="<%= report.webglVersion === 2 ? 'active' : '' %>">WebGL 2</a>
        </div>
    </script>

    <a href="https://github.com/AnalyticalGraphicsInc/webglreport" target="_blank"><img style="position: absolute; top: 0; right: 0; border: 0;" src="images/ForkMe_Ribbons/ForkMe_Blk.png" alt="Fork me on GitHub"></a>

    <h1>WebGL Report</h1>

    <p id="javascript_disabled" class="align-center">You need to enable JavaScript to see WebGL.</p>

    <div class="main-output" id="output">
    </div>

    <script type="text/javascript">
        var _noJS = document.getElementById('javascript_disabled');
        _noJS.parentNode.removeChild(_noJS);
    </script>

    <!-- Google tag (gtag.js) -->
    <script async src="https://www.googletagmanager.com/gtag/js?id=G-J8WBKY4K3W"></script>
    <script>
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());

    gtag('config', 'G-J8WBKY4K3W');
    </script>
</body>
</html>


================================================
FILE: webglreport.js
================================================
/*jslint browser: true, vars: true, white: true, nomen: true*/
/*jshint white: false, nomen: false*/
/*global $, _*/
$(function() {
    "use strict";

    var webglVersion = window.location.search.indexOf('v=2') > 0 ? 2 : 1;

    var template = _.template($('#reportTemplate').html());
    var report = {
        platform: navigator.platform,
        userAgent: navigator.userAgent,
        webglVersion: webglVersion
    };

    if (webglVersion === 2) {
        $('body').addClass('webgl2');
    }

    if ((webglVersion === 2 && !window.WebGL2RenderingContext) ||
        (webglVersion === 1 && !window.WebGLRenderingContext)) {
        // The browser does not support WebGL
        $('#output').addClass('warn');
        renderReport($('#webglNotSupportedTemplate').html());
        return;
    }

    var canvas = $('<canvas />', { width: '1', height: '1' }).appendTo('body');
    var gl;
    var possibleNames = (webglVersion === 2) ? ['webgl2', 'experimental-webgl2'] : ['webgl', 'experimental-webgl'];
    var contextName = _.find(possibleNames, function (name) {
        gl = canvas[0].getContext(name, { stencil: true });
        return !!gl;
    });
    canvas.remove();

    if (!gl) {
        // The browser supports WebGL, but initialization failed
        $('#output').addClass('warn');
        renderReport($('#webglNotEnabledTemplate').html());
        return;
    }

    function getExtensionUrl(extension) {
        //special cases
        if (extension === 'WEBKIT_lose_context') {
            extension = 'WEBGL_lose_context';
        }
        else if (extension === 'WEBKIT_WEBGL_compressed_textures') {
            extension = '';
        }
        extension = extension.replace(/^WEBKIT_/, '');
        extension = extension.replace(/^MOZ_/, '');
        extension = extension.replace(/_EXT_/, '_');

        return 'https://www.khronos.org/registry/webgl/extensions/' + extension;
    }

    function renderReport(header) {
        var tabsTemplate = _.template($('#webglVersionTabs').html());
        var headerTemplate = _.template(header);
        $('#output').html(tabsTemplate({
            report: report,
        }) + headerTemplate({
            report: report,
        }) + template({
            report: report,
            getExtensionUrl: getExtensionUrl,
            getWebGL2ExtensionUrl: getWebGL2ExtensionUrl
        }));
    }

    function describeRange(value) {
        return '[' + value[0] + ', ' + value[1] + ']';
    }

    function getMaxAnisotropy() {
        var e = gl.getExtension('EXT_texture_filter_anisotropic')
                || gl.getExtension('WEBKIT_EXT_texture_filter_anisotropic')
                || gl.getExtension('MOZ_EXT_texture_filter_anisotropic');

        if (e) {
            var max = gl.getParameter(e.MAX_TEXTURE_MAX_ANISOTROPY_EXT);
            // See Canary bug: https://code.google.com/p/chromium/issues/detail?id=117450
            if (max === 0) {
                max = 2;
            }
            return max;
        }
        return 'n/a';
    }

    function formatPower(exponent, verbose) {
        if (verbose) {
            return '' + Math.pow(2, exponent);
        } else {
            return '2<sup>' + exponent + '</sup>';
        }
    }

    function getPrecisionDescription(precision, verbose) {
        var verbosePart = verbose ? ' bit mantissa' : '';
        return '[-' + formatPower(precision.rangeMin, verbose) + ', ' + formatPower(precision.rangeMax, verbose) + '] (' + precision.precision + verbosePart + ')'
    }

    function getBestFloatPrecision(shaderType) {
        var high = gl.getShaderPrecisionFormat(shaderType, gl.HIGH_FLOAT);
        var medium = gl.getShaderPrecisionFormat(shaderType, gl.MEDIUM_FLOAT);
        var low = gl.getShaderPrecisionFormat(shaderType, gl.LOW_FLOAT);

        var best = high;
        if (high.precision === 0) {
            best = medium;
        }

        return '<span title="High: ' + getPrecisionDescription(high, true) + '\n\nMedium: ' + getPrecisionDescription(medium, true) + '\n\nLow: ' + getPrecisionDescription(low, true) + '">' +
            getPrecisionDescription(best, false) + '</span>';
    }

    function getFloatIntPrecision(gl) {
        var high = gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT);
        var s = (high.precision !== 0) ? 'highp/' : 'mediump/';

        high = gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_INT);
        s += (high.rangeMax !== 0) ? 'highp' : 'lowp';

        return s;
    }

    function isPowerOfTwo(n) {
        return (n !== 0) && ((n & (n - 1)) === 0);
    }

    function getAngle(gl) {
        var lineWidthRange = describeRange(gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE));

        // Heuristic: ANGLE is only on Windows, not in IE, and not in Edge, and does not implement line width greater than one.
        var angle = ((navigator.platform === 'Win32') || (navigator.platform === 'Win64')) &&
            (gl.getParameter(gl.RENDERER) !== 'Internet Explorer') &&
            (gl.getParameter(gl.RENDERER) !== 'Microsoft Edge') &&
            (lineWidthRange === describeRange([1,1]));

        if (angle) {
            // Heuristic: D3D11 backend does not appear to reserve uniforms like the D3D9 backend, e.g.,
            // D3D11 may have 1024 uniforms per stage, but D3D9 has 254 and 221.
            //
            // We could also test for WEBGL_draw_buffers, but many systems do not have it yet
            // due to driver bugs, etc.
            if (isPowerOfTwo(gl.getParameter(gl.MAX_VERTEX_UNIFORM_VECTORS)) && isPowerOfTwo(gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS))) {
                return 'Yes, D3D11';
            } else {
                return 'Yes, D3D9';
            }
        }

        return 'No';
    }

    function getMajorPerformanceCaveat(contextName) {
        // Does context creation fail to do a major performance caveat?
        var canvas = $('<canvas />', { width : '1', height : '1' }).appendTo('body');
        var gl = canvas[0].getContext(contextName, { failIfMajorPerformanceCaveat : true });
        canvas.remove();

        if (!gl) {
            // Our original context creation passed.  This did not.
            return 'Yes';
    }

        if (typeof gl.getContextAttributes().failIfMajorPerformanceCaveat === 'undefined') {
            // If getContextAttributes() doesn't include the failIfMajorPerformanceCaveat
            // property, assume the browser doesn't implement it yet.
            return 'Not implemented';
        }

    return 'No';
    }

    function getDraftExtensionsInstructions() {
        if (navigator.userAgent.indexOf('Chrome') !== -1) {
            return 'To see draft extensions in Chrome, browse to about:flags, enable the "Enable WebGL Draft Extensions" option, and relaunch.';
        } else if (navigator.userAgent.indexOf('Firefox') !== -1) {
            return 'To see draft extensions in Firefox, browse to about:config and set webgl.enable-draft-extensions to true.';
        }

        return '';
    }

    function getMaxColorBuffers(gl) {
        var maxColorBuffers = 1;
        var ext = gl.getExtension("WEBGL_draw_buffers");
        if (ext != null) 
            maxColorBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
        
        return maxColorBuffers;
    }

    function getUnmaskedInfo(gl) {
        var unMaskedInfo = {
            renderer: '',
            vendor: ''
        };
        
        var dbgRenderInfo = gl.getExtension("WEBGL_debug_renderer_info");
        if (dbgRenderInfo != null) {
            unMaskedInfo.renderer = gl.getParameter(dbgRenderInfo.UNMASKED_RENDERER_WEBGL);
            unMaskedInfo.vendor   = gl.getParameter(dbgRenderInfo.UNMASKED_VENDOR_WEBGL);
        }
        
        return unMaskedInfo;
    }

    function showNull(v) {
        return (v === null) ? 'n/a' : v;
    }
    
    var webglToEsNames = {
        'getInternalformatParameter' : 'getInternalformativ',
        'uniform1ui' : 'uniform',
        'uniform2ui' : 'uniform',
        'uniform3ui' : 'uniform',
        'uniform4ui' : 'uniform',
        'uniform1uiv' : 'uniform',
        'uniform2uiv' : 'uniform',
        'uniform3uiv' : 'uniform',
        'uniform4uiv' : 'uniform',
        'uniformMatrix2x3fv' : 'uniform',
        'uniformMatrix3x2fv' : 'uniform',
        'uniformMatrix2x4fv' : 'uniform',
        'uniformMatrix4x2fv' : 'uniform',
        'uniformMatrix3x4fv' : 'uniform',
        'uniformMatrix4x3fv' : 'uniform',
        'vertexAttribI4i' : 'vertexAttrib',
        'vertexAttribI4iv' : 'vertexAttrib',
        'vertexAttribI4ui' : 'vertexAttrib',
        'vertexAttribI4uiv' : 'vertexAttrib',
        'vertexAttribIPointer' : 'vertexAttribPointer',
        'vertexAttribDivisor' : 'vertexAttribDivisor',
        'createQuery' : 'genQueries',
        'deleteQuery' : 'deleteQueries',
        'endQuery' : 'beginQuery',
        'getQuery' : 'getQueryiv',
        'getQueryParameter' : 'getQueryObjectuiv',
        'samplerParameteri' : 'samplerParameter',
        'samplerParameterf' : 'samplerParameter',
        'clearBufferiv' : 'clearBuffer',
        'clearBufferuiv' : 'clearBuffer',
        'clearBufferfv' : 'clearBuffer',
        'clearBufferfi' : 'clearBuffer',
        'createSampler' : 'genSamplers',
        'deleteSampler' : 'deleteSamplers',
        'getSyncParameter' : 'getSynciv',
        'createTransformFeedback' : 'genTransformFeedbacks',
        'deleteTransformFeedback' : 'deleteTransformFeedbacks',
        'endTransformFeedback' : 'beginTransformFeedback',
        'getIndexedParameter' : 'get',
        'getActiveUniforms' : 'getActiveUniformsiv',
        'getActiveUniformBlockParameter' : 'getActiveUniformBlockiv',
        'createVertexArray' : 'genVertexArrays',
        'deleteVertexArray' : 'deleteVertexArrays'
    };

    function getWebGL2ExtensionUrl(name) {
        if (name === 'getBufferSubData') {
            return 'http://www.opengl.org/sdk/docs/man/docbook4/xhtml/glGetBufferSubData.xml';
        }

        if (webglToEsNames[name]) {
            name = webglToEsNames[name];
        }

        var filename = 'gl' + name[0].toUpperCase() + name.substring(1) + '.xhtml';
        return 'http://www.khronos.org/opengles/sdk/docs/man3/html/' + filename;
    }

    function getWebGL2Status(gl, contextName) {
        var webgl2Names = [
            'copyBufferSubData',
            'getBufferSubData',
            'blitFramebuffer',
            'framebufferTextureLayer',
            'getInternalformatParameter',
            'invalidateFramebuffer',
            'invalidateSubFramebuffer',
            'readBuffer',
            'renderbufferStorageMultisample',
            'texStorage2D',
            'texStorage3D',
            'texImage3D',
            'texSubImage3D',
            'copyTexSubImage3D',
            'compressedTexImage3D',
            'compressedTexSubImage3D',
            'getFragDataLocation',
            'uniform1ui',
            'uniform2ui',
            'uniform3ui',
            'uniform4ui',
            'uniform1uiv',
            'uniform2uiv',
            'uniform3uiv',
            'uniform4uiv',
            'uniformMatrix2x3fv',
            'uniformMatrix3x2fv',
            'uniformMatrix2x4fv',
            'uniformMatrix4x2fv',
            'uniformMatrix3x4fv',
            'uniformMatrix4x3fv',
            'vertexAttribI4i',
            'vertexAttribI4iv',
            'vertexAttribI4ui',
            'vertexAttribI4uiv',
            'vertexAttribIPointer',
            'vertexAttribDivisor',
            'drawArraysInstanced',
            'drawElementsInstanced',
            'drawRangeElements',
            'drawBuffers',
            'clearBufferiv',
            'clearBufferuiv',
            'clearBufferfv',
            'clearBufferfi',
            'createQuery',
            'deleteQuery',
            'isQuery',
            'beginQuery',
            'endQuery',
            'getQuery',
            'getQueryParameter',
            'createSampler',
            'deleteSampler',
            'isSampler',
            'bindSampler',
            'samplerParameteri',
            'samplerParameterf',
            'getSamplerParameter',
            'fenceSync',
            'isSync',
            'deleteSync',
            'clientWaitSync',
            'waitSync',
            'getSyncParameter',
            'createTransformFeedback',
            'deleteTransformFeedback',
            'isTransformFeedback',
            'bindTransformFeedback',
            'beginTransformFeedback',
            'endTransformFeedback',
            'transformFeedbackVaryings',
            'getTransformFeedbackVarying',
            'pauseTransformFeedback',
            'resumeTransformFeedback',
            'bindBufferBase',
            'bindBufferRange',
            'getIndexedParameter',
            'getUniformIndices',
            'getActiveUniforms',
            'getUniformBlockIndex',
            'getActiveUniformBlockParameter',
            'getActiveUniformBlockName',
            'uniformBlockBinding',
            'createVertexArray',
            'deleteVertexArray',
            'isVertexArray',
            'bindVertexArray'
        ];

        var webgl2 = (contextName.indexOf('webgl2') !== -1);

        var functions = [];
        var totalImplemented = 0;
        var length = webgl2Names.length;

        if (webgl2) {
            for (var i = 0; i < length; ++i) {
                var name = webgl2Names[i];
                var className = 'extension';
                if (webgl2 && gl[name]) {
                    ++totalImplemented;
                } else {
                    className += ' unsupported';
                }
                functions.push({ name: name, className: className });
            }
        }

        return {
            status : webgl2 ? (totalImplemented + ' of ' + length + ' new functions implemented.') :
                'webgl2 and experimental-webgl2 contexts not available.',
            functions : functions
        };
    }

    var webgl2Status = getWebGL2Status(gl, contextName);

    report = _.extend(report, {
        contextName: contextName,
        glVersion: gl.getParameter(gl.VERSION),
        shadingLanguageVersion: gl.getParameter(gl.SHADING_LANGUAGE_VERSION),
        vendor: gl.getParameter(gl.VENDOR),
        renderer: gl.getParameter(gl.RENDERER),
        unMaskedVendor: getUnmaskedInfo(gl).vendor,
        unMaskedRenderer: getUnmaskedInfo(gl).renderer,
        antialias:  gl.getContextAttributes().antialias ? 'Available' : 'Not available',
        angle: getAngle(gl),
        majorPerformanceCaveat: getMajorPerformanceCaveat(contextName),
        maxColorBuffers: getMaxColorBuffers(gl),
        redBits: gl.getParameter(gl.RED_BITS),
        greenBits: gl.getParameter(gl.GREEN_BITS),
        blueBits: gl.getParameter(gl.BLUE_BITS),
        alphaBits: gl.getParameter(gl.ALPHA_BITS),
        depthBits: gl.getParameter(gl.DEPTH_BITS),
        stencilBits: gl.getParameter(gl.STENCIL_BITS),
        maxRenderBufferSize: gl.getParameter(gl.MAX_RENDERBUFFER_SIZE),
        maxCombinedTextureImageUnits: gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS),
        maxCubeMapTextureSize: gl.getParameter(gl.MAX_CUBE_MAP_TEXTURE_SIZE),
        maxFragmentUniformVectors: gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS),
        maxTextureImageUnits: gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS),
        maxTextureSize: gl.getParameter(gl.MAX_TEXTURE_SIZE),
        maxVaryingVectors: gl.getParameter(gl.MAX_VARYING_VECTORS),
        maxVertexAttributes: gl.getParameter(gl.MAX_VERTEX_ATTRIBS),
        maxVertexTextureImageUnits: gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS),
        maxVertexUniformVectors: gl.getParameter(gl.MAX_VERTEX_UNIFORM_VECTORS),
        aliasedLineWidthRange: describeRange(gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE)),
        aliasedPointSizeRange: describeRange(gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE)),
        maxViewportDimensions: describeRange(gl.getParameter(gl.MAX_VIEWPORT_DIMS)),
        maxAnisotropy: getMaxAnisotropy(),
        vertexShaderBestPrecision: getBestFloatPrecision(gl.VERTEX_SHADER),
        fragmentShaderBestPrecision: getBestFloatPrecision(gl.FRAGMENT_SHADER),
        fragmentShaderFloatIntPrecision: getFloatIntPrecision(gl),

        extensions: gl.getSupportedExtensions(),
        draftExtensionsInstructions: getDraftExtensionsInstructions(),

        webgl2Status : webgl2Status.status,
        webgl2Functions : webgl2Status.functions
    });

    if (webglVersion > 1) {
        report = _.extend(report, {
            maxVertexUniformComponents: showNull(gl.getParameter(gl.MAX_VERTEX_UNIFORM_COMPONENTS)),
            maxVertexUniformBlocks: showNull(gl.getParameter(gl.MAX_VERTEX_UNIFORM_BLOCKS)),
            maxVertexOutputComponents: showNull(gl.getParameter(gl.MAX_VERTEX_OUTPUT_COMPONENTS)),
            maxVaryingComponents: showNull(gl.getParameter(gl.MAX_VARYING_COMPONENTS)),
            maxFragmentUniformComponents: showNull(gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_COMPONENTS)),
            maxFragmentUniformBlocks: showNull(gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_BLOCKS)),
            maxFragmentInputComponents: showNull(gl.getParameter(gl.MAX_FRAGMENT_INPUT_COMPONENTS)),
            minProgramTexelOffset: showNull(gl.getParameter(gl.MIN_PROGRAM_TEXEL_OFFSET)),
            maxProgramTexelOffset: showNull(gl.getParameter(gl.MAX_PROGRAM_TEXEL_OFFSET)),
            maxDrawBuffers: showNull(gl.getParameter(gl.MAX_DRAW_BUFFERS)),
            maxColorAttachments: showNull(gl.getParameter(gl.MAX_COLOR_ATTACHMENTS)),
            maxSamples: showNull(gl.getParameter(gl.MAX_SAMPLES)),
            max3dTextureSize: showNull(gl.getParameter(gl.MAX_3D_TEXTURE_SIZE)),
            maxArrayTextureLayers: showNull(gl.getParameter(gl.MAX_ARRAY_TEXTURE_LAYERS)),
            maxTextureLodBias: showNull(gl.getParameter(gl.MAX_TEXTURE_LOD_BIAS)),
            maxUniformBufferBindings: showNull(gl.getParameter(gl.MAX_UNIFORM_BUFFER_BINDINGS)),
            maxUniformBlockSize: showNull(gl.getParameter(gl.MAX_UNIFORM_BLOCK_SIZE)),
            uniformBufferOffsetAlignment: showNull(gl.getParameter(gl.UNIFORM_BUFFER_OFFSET_ALIGNMENT)),
            maxCombinedUniformBlocks: showNull(gl.getParameter(gl.MAX_COMBINED_UNIFORM_BLOCKS)),
            maxCombinedVertexUniformComponents: showNull(gl.getParameter(gl.MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS)),
            maxCombinedFragmentUniformComponents: showNull(gl.getParameter(gl.MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS)),
            maxTransformFeedbackInterleavedComponents: showNull(gl.getParameter(gl.MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS)),
            maxTransformFeedbackSeparateAttribs: showNull(gl.getParameter(gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS)),
            maxTransformFeedbackSeparateComponents: showNull(gl.getParameter(gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS)),
            maxElementIndex: showNull(gl.getParameter(gl.MAX_ELEMENT_INDEX)),
            maxServerWaitTimeout: showNull(gl.getParameter(gl.MAX_SERVER_WAIT_TIMEOUT))
        });
    }

    if (window.externalHost) {
        // Tab is running with Chrome Frame
        renderReport($('#webglSupportedChromeFrameTemplate').html());
    }
    else {
        renderReport($('#webglSupportedTemplate').html());
    }

    var pipeline = $('.pipeline')
    var background = $('.background')[0];

    background.width = pipeline.width();
    background.height = pipeline.height();

    var hasVertexTextureUnits = gl.getParameter(gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS) > 0;

    var context = background.getContext('2d');
    context.shadowOffsetX = 3;
    context.shadowOffsetY = 3;
    context.shadowBlur = 7;
    context.shadowColor = 'rgba(0, 0, 0, 0.5)';
    context.strokeStyle = 'black';

    var boxPadding = 4;

    function drawBox(element, fill) {
        var pos = element.position();
        var x = pos.left - boxPadding;
        var y = pos.top - boxPadding;
        var width = element.outerWidth() + (boxPadding * 2);
        var height = element.outerHeight() + (boxPadding * 2);
        var radius = 10;

        context.fillStyle = fill;
        context.lineWidth = 2;
        context.beginPath();
        context.moveTo(x + radius, y);
        context.lineTo(x + width - radius, y);
        context.quadraticCurveTo(x + width, y, x + width, y + radius);
        context.lineTo(x + width, y + height - radius);
        context.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
        context.lineTo(x + radius, y + height);
        context.quadraticCurveTo(x, y + height, x, y + height - radius);
        context.lineTo(x, y + radius);
        context.quadraticCurveTo(x, y, x + radius, y);
        context.closePath();
        context.stroke();
        context.fill();

        return { x: x, y: y, width: width, height: height };
    }

    function drawLeftHead(x, y) {
        context.beginPath();
        context.moveTo(x + 5, y + 15);
        context.lineTo(x - 10, y);
        context.lineTo(x + 5, y - 15);
        context.quadraticCurveTo(x, y, x + 5, y + 15);
        context.fill();
    }

    function drawRightHead(x, y) {
        context.beginPath();
        context.moveTo(x - 5, y + 15);
        context.lineTo(x + 10, y);
        context.lineTo(x - 5, y - 15);
        context.quadraticCurveTo(x, y, x - 5, y + 15);
        context.fill();
    }

    function drawDownHead(x, y) {
        context.beginPath();
        context.moveTo(x + 15, y - 5);
        context.lineTo(x, y + 10);
        context.lineTo(x - 15, y - 5);
        context.quadraticCurveTo(x, y, x + 15, y - 5);
        context.fill();
    }

    function drawDownArrow(topBox, bottomBox) {
        context.beginPath();

        var arrowTopX = topBox.x + topBox.width / 2;
        var arrowTopY = topBox.y + topBox.height;
        var arrowBottomX = bottomBox.x + bottomBox.width / 2;
        var arrowBottomY = bottomBox.y - 15;
        context.moveTo(arrowTopX, arrowTopY);
        context.lineTo(arrowBottomX, arrowBottomY);
        context.stroke();

        drawDownHead(arrowBottomX, arrowBottomY);
    }

    function drawRightArrow(leftBox, rightBox, factor) {
        context.beginPath();

        var arrowLeftX = leftBox.x + leftBox.width;
        var arrowRightX = rightBox.x - 15;
        var arrowRightY = rightBox.y + rightBox.height * factor;
        context.moveTo(arrowLeftX, arrowRightY);
        context.lineTo(arrowRightX, arrowRightY);
        context.stroke();

        drawRightHead(arrowRightX, arrowRightY);
    }

    var webgl2color = (webglVersion > 1) ? '#02AFCF' : '#aaa';

    var vertexShaderBox = drawBox($('.vertexShader'), '#ff6700');
    var transformFeedbackBox = drawBox($('.transformFeedback'), webgl2color);
    var rasterizerBox = drawBox($('.rasterizer'), '#3130cb');
    var fragmentShaderBox = drawBox($('.fragmentShader'), '#ff6700');
    var framebufferBox = drawBox($('.framebuffer'), '#7c177e');
    var texturesBox = drawBox($('.textures'), '#3130cb');
    var uniformBuffersBox = drawBox($('.uniformBuffers'), webgl2color);

    var arrowRightX = texturesBox.x;
    var arrowRightY = texturesBox.y + (texturesBox.height / 2);
    var arrowMidX = (texturesBox.x + vertexShaderBox.x + vertexShaderBox.width) / 2;
    var arrowMidY = arrowRightY;
    var arrowTopMidY = texturesBox.y - 15;
    var arrowBottomMidY = fragmentShaderBox.y + (fragmentShaderBox.height * 0.55);
    var arrowTopLeftX = vertexShaderBox.x + vertexShaderBox.width + 15;
    var arrowTopLeftY = arrowTopMidY;
    var arrowBottomLeftX = fragmentShaderBox.x + fragmentShaderBox.width + 15;
    var arrowBottomLeftY = arrowBottomMidY;

    if (hasVertexTextureUnits) {
        context.fillStyle = context.strokeStyle = 'black';
        context.lineWidth = 10;
    } else {
        context.fillStyle = context.strokeStyle = '#FFF';
        context.shadowColor = '#000';
        context.shadowOffsetX = context.shadowOffsetY = 0;
        context.lineWidth = 8;
    }

    context.beginPath();
    context.moveTo(arrowMidX, arrowMidY);
    context.lineTo(arrowMidX, arrowTopMidY);
    if (hasVertexTextureUnits) {
        context.lineTo(arrowTopLeftX, arrowTopMidY);
        context.stroke();
        drawLeftHead(arrowTopLeftX, arrowTopLeftY);
    } else {
        context.stroke();
        context.shadowColor = '#000';
        context.font = 'bold 14pt arial, Sans-Serif';
        context.fillText('No vertex textures available.', arrowMidX - 8, arrowTopMidY - 8);
    }

    context.lineWidth = 10;
    context.fillStyle = context.strokeStyle = 'black';
    context.shadowColor = 'rgba(0, 0, 0, 0.5)';
    context.shadowOffsetX = context.shadowOffsetY = 3;
    context.beginPath();

    context.moveTo(arrowRightX, arrowRightY);

    context.lineTo(arrowMidX - context.lineWidth * 0.5, arrowMidY);
    context.moveTo(arrowMidX, arrowMidY);
    context.lineTo(arrowMidX, arrowBottomMidY);
    context.lineTo(arrowBottomLeftX, arrowBottomLeftY);

    var uniformBuffersMidY = uniformBuffersBox.y + uniformBuffersBox.height / 2;
    context.moveTo(arrowMidX, uniformBuffersMidY);
    context.lineTo(arrowRightX, uniformBuffersMidY);

    context.stroke();

    drawLeftHead(arrowBottomLeftX, arrowBottomLeftY);

    drawRightArrow(vertexShaderBox, transformFeedbackBox, 0.5);
    drawDownArrow(vertexShaderBox, rasterizerBox);
    drawDownArrow(rasterizerBox, fragmentShaderBox);
    if (webglVersion === 1) {
        drawDownArrow(fragmentShaderBox, framebufferBox);
    } else {
        drawRightArrow(fragmentShaderBox, framebufferBox, 0.7);
    }

    window.gl = gl;
});