That would be a great suggestion, but the it has multiple dynamic lights; different lights could light different pixels. They also move around and are slightly "above" the sprites so the near light...

That is a good suggestion, but my lighting model takes proximity to the light into account as well, sort of like it's an overhead light, and multiple light sources that are moving.

I ported a programme in 2D in MSDOS to DirectX 3 (a long time ago;) now I want to port it to OpenGL. Surfaces in DirectDraw allowed quick work of it (when there was a DirectDraw,) but now I want to...