Understanding the game loop

A key concept in game design is the game loop. In any game, the code must run over and over again, performing a series of tasks such as input, AI, physics, and rendering. A game loop might look something like this:

while(loop_forever) {
    get_user_input();
    move_game_objects();
    collision_detection();
    render_game_objects();
    play_audio();
}

An SDL/C++ game targeting almost any platform except WebAssembly would have a while loop, probably located within the main function of the C++ code, that would exit only when the player exits the game. WebAssembly shares its runtime with the JavaScript engine inside your web browser. The JavaScript engine runs on a single thread, and Emscripten uses JavaScript glue code to take what you have done inside SDL within WebAssembly and render that to the HTML canvas element. Therefore, we need to use an Emscripten...