Perl and Subroutine Refrences

I'm not quite sure where to start.  I'm trying to wrap Sourceforge's
libfov project (http://sourceforge.net/projects/libfov).  I'm running
into difficulty in regards to callbacks.  The library allows you to set
the two callbacks as follows:

void fov_settings_set_opacity_test_function(fov_settings_type *settings,
                                            bool (*f)(void *map,
                                                      int x, int y)) {
    settings->opaque = f;
}

void fov_settings_set_apply_lighting_function(fov_settings_type *settings,
                                              void (*f)(void *map,
                                                        int x, int y,
                                                        int dx, int dy,
                                                        void *src)) {
    settings->apply = f;
}

In the example simple.cc file this is handled as follows:

void apply(void *map, int x, int y, int dx, int dy, void *src) {
	if (((MAP *)map)->onMap(x, y))
		((MAP *)map)->setSeen(x, y);
}

bool opaque(void *map, int x, int y) {
	return ((MAP *)map)->blockLOS(x, y);
}

How on Earth can I usefully wrap this with Perl?  Ideally, the end-user
would create their own Map object that implements the setSeen() and
blockLOS() routines and they would simply be magically called.  I cannot
simply add the above 2 declarations to the main fov.h file because MAP
is a specific C type.  Do I need to also wrap some basic MAP object that
the end-user would have to inherit to make the above work?  I'm really
kinda confused.

Anyway, I thank you for your time and attention.

P.S.  Yes, this is a resend.  It is the first and last.  I just wanted
to see if anybody could help me.

--

-- 
Aaron Dalton       |   Super Duper Games
aaron <at> daltons.ca   |   http://superdupergames.org

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