main.c

#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>

int main(int argc, char *argv[]) {
    // This prevents compiler warnings
    // We don't actually need these variables, but they do need to be there so SDL_main works
    (void)argc;
    (void)argv;

    // Initialize sdl
    if(!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMEPAD)) {
        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
        return 1;
    }

    SDL_Window * window = NULL;
    SDL_Renderer * renderer = NULL;
    if (!SDL_CreateWindowAndRenderer("window", 480, 272, 0, &window, &renderer)) {
        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
        SDL_Quit();
        return 2;
    }

    SDL_FRect square = {216, 96, 34, 64}; 

    int running = 1;
    SDL_Event event;
    while (running) { 
        // Process input
        if (SDL_PollEvent(&event)) {
            switch (event.type) {
                case SDL_EVENT_QUIT:
                    // End the loop if the programs is being closed
                    running = 0;
                    break;
                case SDL_EVENT_GAMEPAD_ADDED:
                    // Connect a controller when it is connected
                    SDL_OpenGamepad(event.cdevice.which);
                    break;
                case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
                    if(event.gbutton.button == SDL_GAMEPAD_BUTTON_START) {
                        // Close the program if start is pressed
                        running = 0;
                    }
                    break;
            }
        }

        // Clear the screen
        SDL_RenderClear(renderer);

        // Draw a red square
        SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
        SDL_RenderFillRect(renderer, &square);

        // Draw everything on a white background
        SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
        SDL_RenderPresent(renderer);
    }
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}