<sect2 id="s3d_cb"><title>typedef s3d_cb</title><programlisting>typedef int(* <link linkend="s3d_cb">s3d_cb</link>)(struct <link linkend="structs3d_evt">s3d_evt</link> *)</programlisting><para>This defines the callback format. Each callback should return void and take an argument of struct <link linkend="structs3d_evt">s3d_evt</link> *. Callbacks can be defined with <link linkend="s3d_set_callback">s3d_set_callback</link>().         </para></sect2>
