Writing urandom to the framebuffer is a joy in and of itself. You actually reminded me to have users add themselves to the video and input group (which does require root privileges usually), but this way they can then run the library without sudo.

As far as I know, a framebuffer can mean a lot of things depending on hardware and implementation, but it was used to refer to actual memory that would contain pixel values that would eventually be written to the screen. In Linux, this is abstracted by the framebuffer device, which is hardware independent (you can actually have several fbdevices, which if I'm not mistaken end up referring to different monitors usually). What's convenient about the implementation is that these devices still work as normal memory devices, which means you can read/write as you would any other memory. Some more info: https://www.kernel.org/doc/html/latest/fb/framebuffer.html

On Linux and on other operating systems that have reused the Linux DRM drivers, you can run OpenGL applications from a virtual terminal text console. Examples are kmscube [1] and the glmark2 benchmark suite.

[1] https://gitlab.freedesktop.org/mesa/kmscube

My first experience with programming was with QuickBasic. You just brought back some memories, wish I still had all of those old programs around.

>how to do fullscreen graphics on my Mac

You can't, you don't have direct access to the framebuffer. Unless by "fullscreen" you just mean spanning from end-to-end in which case you can create an opengl or metal view and just set the fullscreen style mask.

Added MIT license

I think trying to use anything from LVGL in this project would reduce to essentially just using LVGL. It's more of a project to try and build most of the components from "scratch", i.e. use as few external libraries as possible.