Particle toy (SDL3)
From SDL School, https://sdlschool.com

Install the tools first. The setup page has the steps for each system:
https://sdlschool.com/start/

Build and run on your computer:

  cmake -S . -B build
  cmake --build build
  ./build/hello

Build for the browser, with Emscripten:

  emcc main.c -sUSE_SDL=3 -o index.html
  emrun index.html
