Communicating with the GPU directly.

Hello. I was wondering how one could go about programming the GPU without the use of OpenGL or DirectX etc. I dont intend to start some unrealisticly large project or anything like that, I just want to learn more about this sort of programming.

Thankyou.
Something like CUDA? http://en.wikipedia.org/wiki/CUDA
Yes, that looks like the right sort of thing. I cant really use CUDA specificly though because its constrained to only NIVIDA graphics cards.
There's OpenCL.
Oh okay, yeah that looks pretty good. Thanks :)
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