Common FFT GPU interface

[jakebolewski]

It would be nice to have a common high level interface to both the CLFFT and CUFFT libraries. They have many similarities (high cost of plan creation, similar feature set, overall api design, etc.) so there is bound to be significant overlap between the two. Making it easy to try out either library with minimal code changes would be worthwhile.

[timholy]

Interesting that you found this!

I agree that something common would be good. I seriously considered targeting OpenCL, but in my browsing I found evidence that clFFT wasn't ideal on NVIDIA hardware (which is what we own). I feel I have enough irons in various fires without embarking on submitting pull requests to the clFFT repository 😄.

Right now this is very bare-bones, and it doesn't even work with the driver API wrapper. Once the low-level stuff is working, then I agree, it would be great to think about a more common interface. It's only a handful of functions, really.

[timholy]

Hah, I didn't even notice until today that you've already got a CLFFT interface! My previous comments may have seemed a bit dense.

When I get around to updating this I will look into providing an interface as similar to yours as possible.