[Scummvm-devel] Timer system change proposal

[Max Horn]

Could we change the current timer system so that the timer proc gets 
an additional parameter: void *refCon

The idea is that when you install a timer, you can pass along a void 
pointer, which in turn can point to any sort of data (or be typecast 
to an int). Then this pointer is simply passed to the timer whenever 
it is invoked. Implementing this in the default timer code is 
trivial, and after looking at the morphos timer I believe it could be 
added there, too.

Why? Because it would allow us to get rid of a few global variables 
(or at least get rid of some of their uses) which currently the 
timers have to use because they have no other way to get to these 
global objects (like g_scumm). If we had refCon, you could just pass 
in that data and the timer callback could cast it to the right format.


This is a common technique, I don't see any problems introducing it, 
but various benefits for it.

Getting rid of g_scumm is one of my mid term goals :-)


Max (who right now is thinking about a GameEngin class which would 
become superclass of Scumm and SimonState and unify the interfaces to 
those two classes)
-- 
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Max Horn
Software Developer

email: <mailto:max at quendi.de>
phone: (+49) 6151-494890