Image manipulation using glsl

[Michael Thaler]

Hi,

> When I tried using npot textures on my 6600 it did everything in software.
> I think only the 7xxx and 8xxx series cards support npot natively.
>
> You could always render the repeats yourself no? Especially if you don't
> need that many of them.

Yes, that is certainly possible. But it would be convenient to use GL_REPEAT 
or GL_MIRRORED_REPEAT and let OpenGL do the work.

But to use filters written in GLSL in Krita, it would be necessary to make 
them work with tiles and I don't know how to do this. There is the "TR - 
OpenGL Tile Rendering Library" which can do tiled rendering. I did not look 
at it yet, but it might be useful as a guidline how to implement tiled 
rendering using OpenGL.

Greetings,
Michael