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<a name="Basics-1"></a>
<h3 class="section">3.1 Basics</h3>
<div class="example">
<pre class="example">(use-modules (sdl2))
</pre></div>
<dl>
<dt><a name="index-sdl_002dinit"></a>Procedure: <strong>sdl-init</strong> <em>[<var>subsystems</var>]</em></dt>
<dd><p>Initialize the SDL library. This must be called before using any
other SDL procedure.
</p>
<p><var>subsystems</var> is an optional list of symbols that specifies the
subsystems to initialize. All subsystems are initialized by default.
The possible flags are <code>timer</code>, <code>audio</code>, <code>video</code>,
<code>haptic</code>, <code>game-controller</code>, and <code>events</code>.
</p></dd></dl>
<dl>
<dt><a name="index-sdl_002dquit"></a>Procedure: <strong>sdl-quit</strong></dt>
<dd><p>Quit all activated SDL subsystems. This procedure should be called
upon all exit conditions.
</p></dd></dl>
<dl>
<dt><a name="index-sdl_002dversion"></a>Procedure: <strong>sdl-version</strong></dt>
<dd><p>Return a three element list containing the major, minor, and patch
version of the linked SDL library.
</p></dd></dl>
<dl>
<dt><a name="index-sdl_002dticks"></a>Procedure: <strong>sdl-ticks</strong></dt>
<dd><p>Return the number of milliseconds since the SDL library was
initialized.
</p></dd></dl>
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