Alright, I've got a basic program that renders a rotating sphere of Earth. I've disabled window borders, but I have no idea how I would make the background transparent. The background being the typical black background that you start off with. I'm using SDL 1.2 with OpenGL and I couldn't figure out how to do it either with SDL's functions or OpenGL's.
Here's what I see:
Essentially, how do I make it appear as though the Earth is the only thing showing? Is this possible using the SDL_SetVideoMode() or is it something I have to do through OpenGL?