OpenGL for DOS?

I’m working on a DOS-based embedded system for ultrasonic inspection and need some fast graphical capabilities. I’m currently using FastGraph which is OK but doesn’t seem to get the most out of the current generation of graphics cards (they’re no faster than the older ones that I’ve tested). What I’m hoping to do is to get hold of some existing code that does this already and port it, since my knowledge of graphics card technology is rudimentary. If it would be worthwhile (or at least interesting) to produce an OpenGL implementation for DOS then all well and good. Any advice on where to start?

There is/was a DOS port of MESA if I recall correctly (