How to get started with realtime & fast pixel manipulation, shifting, randomizing,

@polyclick wrote:

Hi guys

I'm looking for some advice on how to get started with manipulating existing footage like a video or an image and throwing around pixels in real time (for lets say a vj set).
I've been using ofPixels a few times and I noticed that when I try to do a little bit more advanced stuff like Pixel Sorting or Pixel displacement, the framerate starts dropping very fast.
Then I figured I needed to go the shaders route, but since they process their pixels in parallel, I can't seem to figure out how to do calculations which use each pixel's neighbouring pixels.

Am I missing out on something? Or is the complexity of these pixel manipulations the reason why there aren't many examples out there?
Here's an example of what I'm trying to accomplish: https://vimeo.com/58448692

Thanks!

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