The docs have a pretty comprehensive explanation. The shader sample should be rather useful too.
What is your issue? What have you tried?
If you're looking for example shaders, you might want to focus your searches on something like "glsl post processing".
Which docs? The GLSL Documentation? You're not expecting me to start learning GLSL from a documentation, are you? >_>
If you mean SFML 2.0 docs, well there's very little about shaders there. Mostly just how to use them with SFML (which I already succeeded in doing
)
It's just that usually, it is very easy to find a good resource for learning practically anything on the internets, but GLSL seems to be an exception. All I was able to find is either old or useless. Or big-badass-books which are just too long.
Anyway, thanks for replying