There are GPGPU FFT routines using multi pass shaders but they mostly
geared toward specific vendor implementations (but im not expert).
http://gpgpu.org/tag/fft
http://http.download.nvidia.com/developer/SDK/Individual_Samples/gpgpu_samples.html
has an FFT implementation as well.
I'd imagine this is perfect for OpenCL, and would not be surprised if
there already existed some OpenCL FFT somewhere out there.
FFT blurring can be fun too, do an FFT, a high pass and iFFT and you
can get some really lovely blurs. I'd imagine a custom plugin would
be the way to go but this is a bit above me. I'd love to see this too,
so I second someone to rise to the challenge :)
On Sep 17, 2009, at 8:10 PM, Chris Wood wrote:
Here's a good challenge: fourier transform an image inside QC.
Preferably at decent speed. Including a quick filter of some sort,
and the inverse transform to get the image back.
Can it be done in any sane way? Anyone tried it?
The FFT methods I've come across so far involve multiple passes on
the image, and swapping between two buffers.. I guess this might
possibly be doable using a CI filter and a bit of javascript magic
in the filter function. They also seem to need two output channels
for each input, which could be more of an issue.
The other option is to write a plugin, but that would be seriously
stretching my openGL skills a bit too far :)
Chris
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