framebuffer problem

[andyz74]

Hello and good evening!

I've done a little experimenting in doing easy graphic-stuff by writing direct to framebuffer /dev/fb0  (Debian Linux 64bit here)
Mainly in Free Pascal, before testing in Assembly.
While getting lots of garbage as output I also tested code, where I think it HAS to be good and HAS to work, I also got garbage.
( https://github.com/xmdi/SCHIZONE/tree/main/ex/ex020_framebuffer )   
If I test it on my Laptop (also Debian), it works, but not here on my beloved Desktopcomputer.

Now to my questions :
1) Is there anything I have to configure on my framebuffer in my Linux, and
2) Is it worth the time, or should I better invest time in SDL2 for doing graphics stuff?

Greetz, Andy

[fredericopissarra]

You have to make sure that your video drivers support /dev/fb? and make sure it is enabled in kernel configs, AND if it is accessible to your user...

It is better to use SDL2 (or 3, it is available now!).

[andyz74]

OK. I will check the Video drivers, If I manage to find Out how. 😂

Do you know If one of both framebuffer / sdl is faster as the other?

[fredericopissarra]

Do you know If one of both framebuffer / sdl is faster as the other?

fbdev don't offer any acceleration support, not even in 2D like Bit Block Transfers (Bitblt)... SDL (2 and 3) does.

[andyz74]

OK...  Thanks you Frederico!  I think, I will do my stuff at sdl2, It is already installed in my system.