Let’s say I only have C/C++ and nothing else. Is it possible to do graphics from scratch?
Everything I found by googling is just to use openGL. But I want to know how it works under the hood(how can I write something like openGL). By the end of a day in also written in C. I just don’t understand where to start. Would be great to have a list of book/articles which can help me to clarify everything a little bit.

So it seems I need to work with raster memory. But how can I access it?