Fabrice Bellard released an OpenGL 1.x/2.x software renderer 20 years ago [0]. There seems to others who have taken to updating it more recently [1][2]. It is

Fabrice Bellard released an OpenGL 1.x/2.x software renderer 20 years ago [0]. There seems to others who have taken to updating it more recently [1][2]. It is direct mode or immediate mode but this is how we used to do graphics more than 15 years ago. Might help others to read this if you're interested. [0] https://bellard.org/TinyGL/ https://bellard.org/TinyGL/ [1] https://github.com/C-Chads/tinygl https://github.com/C-Chads/tinygl [2] https://github.com/ska80/tinygl https://github.com/ska80/tinygl