The lightmaps aren't updated at all yet, so everything is static.
Figuring out how lightmap data gets to the gpu was a chore thanks to the
spaghetti in the bsp data, and then I'd forgotten that I was
pre-expanding the light data to rgb so wound up with weird lightmaps,
but without water or particles, demo1 is getting 5000fps at 800x450, and
it seems to be CPU limited.
This is a big step towards a cleaner api. The struct reference in
model_t really should be a pointer, but bsp submodel(?) loading messed
that up, though that's just a matter of taking more care in the loading
code. It seems sensible to make that a separate step.
