Not-100%-classic: OpenGL driver dev for Mac OS 9?

I'm going to call this "classic by fiat", since Apple has decided that it's "vintage" enough to have stripped most of the content was ever easily available there to begin with. I'm looking for any guides, sample code, etc. on developing OpenGL drivers for Mac OS 9, since an evening with Google has proven mostly fruitless. I've found plenty on developing OS 9 OpenGL *applications*, but I'm looking for even just a reference for the hooks that need to go into the driver. So far, I've come up pretty empty. I always have the option of reverse-engineering existing drivers, since I have a copy of IDA Pro, but that's obviously a BIG time commitment. Anyone have such a thing in their possession or know to whom I should speak? I'll be posting this on a few lists/forums. - Dave