This is the first version of the GLSLVideoEffects patch. It is made with the Ofelia library.
It creates an effect chain of three GLSL shaders.
The effects are mainly adaptions from existing shaders.
It started as a technical issue, but I think it is a patch on its own now...
I tried to make it easy to change or substitute GLSL effects or to expand the patch.
I have some further ideas, but this is the basic concept.
The interface makes also use of the new "coords" message for canvas positions, which works very well.