// SDL2 + C : bare-metal retro coding

// minimal_sdl2_retro.c
#include <SDL2/SDL.h>
int main(int argc, char* argv[]) {
    SDL_Init(SDL_INIT_VIDEO);
    SDL_Window*   win = SDL_CreateWindow("Retro Green",
        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, 0);
    SDL_Renderer* ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_SOFTWARE);
    int running = 1;
    SDL_Event ev;
    while (running) {
        while (SDL_PollEvent(&ev))
            if (ev.type == SDL_QUIT) running = 0;
        SDL_SetRenderDrawColor(ren, 0, 40, 0, 255);
        SDL_RenderClear(ren);
        SDL_SetRenderDrawColor(ren, 50, 255, 50, 255);
        SDL_RenderDrawRect(ren, NULL);
        SDL_RenderPresent(ren);
        SDL_Delay(16);
    }
    SDL_DestroyRenderer(ren); SDL_DestroyWindow(win); SDL_Quit();
    return 0;
}