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* Chickadee: (chickadee). Game programming toolkit for Guile.
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<title>The Listener (The Chickadee Game Toolkit)</title>
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<span id="The-Listener"></span><div class="header">
<p>
Next: <a href="The-Environment.html#The-Environment" accesskey="n" rel="next">The Environment</a>, Previous: <a href="Sources.html#Sources" accesskey="p" rel="prev">Sources</a>, Up: <a href="Audio.html#Audio" accesskey="u" rel="up">Audio</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<span id="The-Listener-1"></span><h4 class="subsection">2.4.3 The Listener</h4>
<p>The listener is a collection of global state that represents the
player within the 3D sound model. For games that do not need 3D sound
modeling, manipulating the listener’s master volume is the only
interesting thing to do here.
</p>
<dl>
<dt id="index-listener_002dvolume">Procedure: <strong>listener-volume</strong></dt>
<dd><p>Return the current master volume of the listener.
</p></dd></dl>
<dl>
<dt id="index-listener_002dposition">Procedure: <strong>listener-position</strong></dt>
<dd><p>Return the current position of the listener.
</p></dd></dl>
<dl>
<dt id="index-listener_002dvelocity">Procedure: <strong>listener-velocity</strong></dt>
<dd><p>Return the current velocity of the listener.
</p></dd></dl>
<dl>
<dt id="index-listener_002dorientation">Procedure: <strong>listener-orientation</strong></dt>
<dd><p>Return the current orientation of the listener.
</p></dd></dl>
<dl>
<dt id="index-set_002dlistener_002dvolume_0021">Procedure: <strong>set-listener-volume!</strong> <em>volume</em></dt>
<dd><p>Set the listener’s master volume to <var>volume</var>, a value in the range [0,
1].
</p></dd></dl>
<dl>
<dt id="index-set_002dlistener_002dposition_0021">Procedure: <strong>set-listener-position!</strong> <em>position</em></dt>
<dd><p>Set the listener’s position to the 3D vector <var>position</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dlistener_002dvelocity_0021">Procedure: <strong>set-listener-velocity!</strong> <em>velocity</em></dt>
<dd><p>Set the listener’s velocity to the 3D vector <var>velocity</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dlistener_002dorientation_0021">Procedure: <strong>set-listener-orientation!</strong> <em>at up</em></dt>
<dd><p>Set the listener’s orientation to the 3D vectors <var>at</var> and
<var>up</var>.
</p></dd></dl>
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