DirectX / OpenGL function mapping

[goruka]

is there any place where I can find an OpenGL -> DirectX function mapping reference? Or at least some OpenGL over DirectX implementation? Because i still can't figure out how where many things are in DirectX...

Like for example, how does one do something like glTexGen in directx?

Thanks!

[anubis]

http://nexe.gamedev.net/directKnowledge/
http://triplebuffer.devmaster.net/