I'm (still working on the damn thing after around 7 months) making a map compiler, and I dont know how to calculate texture coords. I've got access to all the usual data needed, such a vertices in a poly, the texture width/height, scaling info for width/height. I have no idea what the formula is to calculate the uv coords, and google doesnt turn up anything useful for this. Thank you for your time.

Here is an articel about spherical mapping:
http://www.mvps.org/directx/articles/spheremap.htm
there are other methos too, like planar mapping and cylindrical mapping.