If you have a mostly 2d UI in mind, you might to from something even simpler than opengl, like SDL or raylib - anything that lets you out pixels on a screen. M

If you have a mostly 2d UI in mind, you might to from something even simpler than opengl, like SDL or raylib - anything that lets you out pixels on a screen. My personal experience is that starting developing in opengl always ends up wasting hours getting the right libs installed to get potentially full 3d GPU acceleration - which might be beyond the point if you want to draw stuff. Casey muratorri is spot on in saying that not having a single, simple, unniversal and basic API to "open a window and draw pixels" is what we lost the most during the 90s. Anyway, try to bypass the not-interesting-to-you parts, and have fun !