Hello sdl,
I have found very old sources of my few 2d effects (bump mapping,
twirl) and decided to share them as public.
The source code is very old and mostly outdated. I was writting this
circa SDL-1.0.1 or something 
Anyway, feel free to download, check how it works and so on.
Projects are saved as Windows Visual C++. I think that most of linux
users will find no difficult in changing code.
These pieces of sources are NOT for education purposes
Stuff at http://www.mystic.net.pl/old_src.html
Question, comments -> box at mystic.net.pl–
Best regards,
Jaros?aw Ro?y?ski