xt</a></li>
<li class="level1"><a href="#context_swap">Buffer swapping</a></li>
<li class="level1"><a href="#context_glext">OpenGL and OpenGL ES extensions</a><ul><li class="level2"><a href="#context_glext_auto">Loading extension with a loader library</a></li>
<li class="level2"><a href="#context_glext_manual">Loading extensions manually</a><ul><li class="level3"><a href="#context_glext_header">The glext.h header</a></li>
<li class="level3"><a href="#context_glext_string">Checking for extensions</a></li>
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