OpenGL render support (bilinear filter)
This is an OpenGL render for sdl using the routines from fb2gl. With this patch you can have bilinear filtering in fullscreen without loss of speed if you are using a 3d accelerator card. The sdl.cpp version in the tarball is the one from version 0.1.0. I am sending it just as an example of how to (easily) use fb2gl to add the OpenGL rendering. View the README and README.fb2gl.
As i am not one of the project developers i can't commit, so it's of no use to get the latest sdl.cpp since it changes a lot.
Ticket imported from: #549676. Ticket imported from: patches/63.