Progress on DGE

[BLM768]

I haven't posted a progress update on my game engine project, 
DGE, for a while. I've managed to find the source of a major bug 
that was holding back development, and I've been making sporadic 
improvements ever since. It's still very incomplete and a bit 
buggy, but at least it draws stuff now. :)

One of the more interesting developments is an expansion of the 
collision detection system. Barring any serious flaws in my code, 
I think I'm about 3/4 of the way to having a working 
capsule-capsule sweep test, which, as far as I've seen, has been 
implemented only one or two times before. Of course, with my 
knowledge of physics, something's probably wrong, but I haven't 
noticed any major issues in recent trials (except, obviously, for 
cases that I haven't implemented). It still needs a good 
broadphase system, but I haven't figured out what I want to do on 
that front...

Anyway, if anyone wants to take a look at the current state of 
the code, it's at http://sourceforge.net/p/d-game-engine. I'll 
probably move it to Github at some point, but I haven't gotten 
around to it.

Also, if anyone has suggestions, enhancement requests, patches, 
etc., I'd be glad to hear them. I'm still not completely sure how 
to design the multi-pass rendering facilities, so suggestions in 
that area would be especially helpful.