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index.php
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index.php
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<?php
// Requested language
$lang = 'en';
$languages = explode("\n", file_get_contents("content/languages"));
if (isset($_GET['lang']) && in_array($_GET['lang'], $languages)) {
$lang = $_GET['lang'];
}
// Load chapter list
$navitems = explode("\n", file_get_contents("content/articles-" . $lang . "/index"));
$navitemTitles = array();
for ($i = 0; $i < count($navitems); $i++) {
$navitems[$i] = explode("/", $navitems[$i]);
$navitemTitles[$navitems[$i][0]] = $navitems[$i][1];
}
// Requested content
$content = $navitems[0][0];
if (isset($_GET["content"])) $content = $_GET["content"];
// Determine how to load the requested content
$notfound = !preg_match("/^[a-z]+$/", $content) || !file_exists("content/articles-" . $lang . "/" . $content . ".md");
if ($notfound) {
$content = 'notfound';
$contentFile = "content/articles-" . $lang . "/notfound.md";
$contentTitle = "Segmentation fault";
} else {
$contentFile = "content/articles-" . $lang . "/" . $content . ".md";
$contentTitle = $navitemTitles[$content];
}
$contentSource = file_get_contents($contentFile);
// Cache mechanism
$last_modified_time = gmdate("r", max(filemtime('index.php'), filemtime($contentFile))) . " GMT";
$etag = md5(file_get_contents('index.php') . $contentSource);
if ((isset($_SERVER["HTTP_IF_MODIFIED_SINCE"]) && $_SERVER["HTTP_IF_MODIFIED_SINCE"] == $last_modified_time) ||
(isset($_SERVER["HTTP_IF_NONE_MATCH"]) && str_replace('"', '', stripslashes($_SERVER['HTTP_IF_NONE_MATCH'])) == $etag))
{
header("HTTP/1.1 304 Not Modified");
exit;
}
header("ETag: " . $etag);
header("Last-Modified: " . $last_modified_time);
header("Cache-Control: public");
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>OpenGL - <?php print($contentTitle); ?></title>
<meta name="description" content="An extensive, yet beginner friendly guide to using modern OpenGL for game development on all major platforms." />
<meta name="author" content="Alexander Overvoorde" />
<meta name="keywords" content="opengl, opengl 3.2, deprecated, non-deprecated, tutorial, guide, cross-platform, game, games, graphics, sfml, sdl, glfw, glut, openglut, beginner, easy" />
<link rel="shortcut icon" type="image/png" href="/media/tag.png" />
<link rel="stylesheet" type="text/css" href="/media/stylesheet.css" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="/media/mobile.css" media="screen and (max-width: 1024px)" />
<script type="text/x-mathjax-config">
// MathJax
MathJax.Hub.Config( {
tex2jax: { inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ] },
menuSettings: { context: "Browser" }
} );
</script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<link rel="stylesheet" href="/includes/zenburn.min.css" />
<script type="text/javascript" src="//yandex.st/highlightjs/6.1/highlight.min.js"></script>
<script type="text/javascript" src="/includes/glmatrix.js"></script>
<script type="text/javascript">
// Syntax highlighting
hljs.initHighlightingOnLoad();
// Disqus
var disqus_url = "http://open.gl/?content=<?php print( $content ); ?>";
var disqus_identifier = "<?php print( $content ); ?>";
// WebGL demos
var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame;
var callbacks = [];
var frame = function() {
var time = +new Date() / 1000;
for (var i = 0; i < callbacks.length; i++) {
var rect = callbacks[i].canvas.getBoundingClientRect();
if (rect.bottom > 0 && rect.top < window.innerHeight)
callbacks[i].callback( time );
}
requestAnimationFrame(frame);
}
function registerAnimatedCanvas(canvas, callback) {
callbacks.push({canvas: canvas, callback: callback});
}
requestAnimationFrame(frame);
</script>
<!--[if lt IE 9]>
<script src="media/html5shiv.js"></script>
<![endif]-->
<!-- Matomo -->
<script type="text/javascript">
var _paq = _paq || [];
/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
_paq.push(["setDocumentTitle", document.domain + "/" + document.title]);
_paq.push(["setCookieDomain", "*.open.gl"]);
_paq.push(["setDomains", ["*.open.gl"]]);
_paq.push(['trackPageView']);
_paq.push(['enableLinkTracking']);
(function() {
var u="//matomo.while.io/";
_paq.push(['setTrackerUrl', u+'piwik.php']);
_paq.push(['setSiteId', '4']);
var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
})();
</script>
<!-- End Matomo Code -->
</head>
<body>
<div id="page">
<!-- Work in progress ribbon -->
<a href="https://github.com/Overv/Open.GL"><img id="ribbon" src="/media/ribbon_fork.png" alt="Fork me!" /></a>
<!-- Navigation items -->
<input type="checkbox" id="nav_toggle" />
<nav>
<label for="nav_toggle" data-open="≡" data-close="✕"></label>
<ul>
<?php
foreach ($navitems as $navitem)
{
if ($navitem[0] == $content)
print( '<li class="selected">' . $navitem[1] . '</li>' . "\n" );
else
print( '<li><a href="/' . $navitem[0] . ($lang == 'en' ? '' : '/' . $lang) . '">' . $navitem[1] . '</a></li>' . "\n" );
}
?>
</ul>
<blockquote style="padding-bottom: 8px; font-size: 14px">
<h2 style="margin: 0">Links</h2>
<a href="https://github.com/Polytonic/Glitter" style="text-decoration: underline">OpenGL boilerplate code</a><br>
<a href="https://github.com/zuck/opengl-examples" style="text-decoration: underline">Easy-to-build code</a><br>
<a href="https://www.youtube.com/playlist?list=PLW3Zl3wyJwWNQjMz941uyOIq3Nw6bcDYC" style="text-decoration: underline">Matrix math tutorials</a><br>
<a href="http://docs.gl" style="text-decoration: underline">OpenGL reference</a>
</blockquote>
<div id="adbox">
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- Open.GL Responsive -->
<ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4259747131061893" data-ad-slot="6609097747" data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div>
</nav>
<!-- Content container -->
<main>
<article>
<?php
include_once("includes/markdown.php");
// Convert links to other chapters
function callback($matches) {
return "($matches[1])";
}
$contentSource = preg_replace_callback("/\\(#([a-z]+)\)/", "callback", $contentSource);
// Correct LaTeX delimiters
function callback2($matches) {
return "\\[" . $matches[1] . "\\]";
}
$contentSource = preg_replace_callback("/\\$\\$([^$]+)\\$\\$/", "callback2", $contentSource);
print(Markdown($contentSource));
?>
</article>
<div id="adbox-article">
<hr />
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- Open.GL Responsive -->
<ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-4259747131061893" data-ad-slot="6609097747" data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div>
<?php
if (!$notfound)
{
?>
<!-- Disqus comments -->
<hr />
<aside id="disqus_thread"></aside>
<script type="text/javascript">
var dsq = document.createElement("script");
dsq.type = "text/javascript";
dsq.async = true;
dsq.src = "//opengl.disqus.com/embed.js";
document.getElementsByTagName("head")[0].appendChild( dsq );
</script>
<?php
}
?>
</main>
</div>
</body>
</html>