A modern Platform Layer for XCB software rendering.
See the X11/XCB Platform Layer for Software Rendering article for some background and a code walk-through.
gcc -std=c23 -O2 -g -Wall -Wextra main.c -lxcb -lxcb-dri3 -lxcb-present -lxcb-cursor -lxcb-render -lxcb-sync -lxcb-keysyms -o main
./main