vp fp interface

[Nil_z]

i have a question, maybe silly :p what is the most suitable interface to write vp&fp for games? I recently start to study vp&fp, and i find there are serval ways to do it, ARB vp&fp extensions, cg, glsl...each uses some different GL function, i just don't know where should I start. I am looking into ARB_vertex_program right now, and can't find any demo with source to point the road :(

can anyone shade me with some light?

please don't cross post. if you're not sure which forum your question belongs in, then it belongs in the beginner's forum :)