Resources to learn how GUI libraries were/are made?

Question

I want to go deeper into things that amaze me. Modern GUIs amaze me. I want to know about the topic in detail. More detail that using a GUI framework like Qt to make an app.I know the processor operates in machine/assembly code. Very early on computers were operated using punched cards and tapes and the outputs were printed out. Then came console based black and white GUIs. Then came color GUIs and after that more sophisticated things.I want to know and study (maybe make my own project) about how a processor can make something appear on a display and how the very first GUIs were made.Are there books, courses or projects I can look at?

richardjam73 · Accepted Answer

GEOS is an early GUI system for the Commodore 64 computer.
https://github.com/geos64128/HG2G2022
That manual contains some detail on how it works.
Source code for GEOS https://github.com/mist64/geos
Quickdraw is the graphics library for the Apple Macintosh https://computerhistory.org/blog/macpaint-and-quickdraw-sour...
Digital Research GEM is another early GUI used in that Atari ST line of computers and later PC systems. Source code is available on the following page. http://www.deltasoft.com/downloads.htm

ofalkaed · Answer

The Xlib Programming Manual and Reference Manual would probably be of interest, they are getting a bit old now but xlib has not changed much and they are still useful.

dataman72 · Answer

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