How is the best way to draw a gui? Are there any basic 2D functions in OpenGL for blitting and such?

Bitmapped polygons?

"Paranoia is the belief in a hidden order behind the visible." - Anonymous

If you are using OpenGL, there are no real dedicated 2d functions, you will most probably want to simply draw texture mapped polygons wherever you need them, there are a bunch of ways to set this up but I recommend wrapping up things in a few function calls, check out Druid''s GL Journal or the Q3A logic source for some ideas on GUI implementation.

-Mezz

Implementing 2D functions with textured quad is very easy and fast!

OpenGL has 2D functions but they are not supported by 3D video cards.

But remember : this solution is FAST only with 3D cards! But if you are planning to implement 2D functions with 3D requirement you can use it.