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poll_mouse - Polls the mouse. Allegro game programming library.
Wherever possible, Allegro will read the mouse input asynchronously (ie. from
inside an interrupt handler), but on some platforms that may not be possible,
in which case you must call this routine at regular intervals to update the
mouse state variables. To help you test your mouse polling code even if you
are programming on a platform that doesn't require it, after the first time
that you call this function Allegro will switch into polling mode, so from
that point onwards you will have to call this routine in order to get any
mouse input at all, regardless of whether the current driver actually needs to
be polled or not.
Returns zero on success, or a negative number on failure (ie. no mouse driver
mouse_x(3alleg4), exlights(3alleg4), exmouse(3alleg4),
exshade(3alleg4), exspline(3alleg4), extrans(3alleg4)