just a technical question, cause I don't know Bennu's source code.
Is it possible to replace SDL with OpenGL?
Yes, it's possible although not desirable in most circumstances. To be clear:
SDL does a lot of things and is arguably the best multi-platform library to do them:
* Input device handling (keyboard, mice, touch, jostick...)
* Window-manager related tasks (creating windows, setting window title, icons...)
* Clipboard management
And actually, we don't want to replace it there because those are working extremely well. What would be interesting to have is an OpenGL/OpenGL ES based blitter that can do everything that BennuGD does internally in some of it's libraries, just much more efficiently.
If those new libraries were written well enough, it'd be a matter of replacing the dlls in a normal installation and things would work beautifully