The OPL2LPT is an OPL2 chip plugged on a parallel port. It is
write-only but otherwise acts as a classic AdLib. This commit adds
support for this device.
User is expected to have the right permissions on the parallel
port. By default, the first suitable parallel port is used. It is
possible to override that with the hidden configuration setting
"opl2lpt_parport".
It depends on the presence of the libieee1284 library which abstracts
a bit parallel port handling. An alternative would be to access
directly /dev/parportX on Linux. This would amount of code but it
would be Linux-only.
Tested with Indy 3 and SOMI.
The original didn't allow loading during combat from it's
options dialog, and I'll leave that untouched, but the ability
to load out of a unwinnable combat is too convenient to not
allow in some form.
I still haven't tracked down how the original handles the
integer division rounding that results in the pre and post
deposit Deposit dialog message being offset by 1 pixel.
But since the problem could be resolved by standardising
when center alignment is set in both messages, and I
haven't noticed any problem elsewhere, I think this is
sufficient for now
This allows the well open door/gate, shoot at enemies, then close
to work with the mouse as well as the keyboard. The pending event
queue has also been limited to 5 pending events. Trust me, you
don't want to spent time spamming Shoot at a high level monster
that can't reach you, only for when it's killed to have to wait
several minutes whilst your party keeps shooting.
Starship Titanic produces lots of "uninitialized value" warnings
at the very beginning of the game, when turning right. This is
because in the very first movie frame it uses codebooks that have
not been loaded. Explicitly set their data to 0 to guarantee
consistent behavior.
