SDL2 Hello World

hello_sdl2.c

// SDL2 Hello, World!
// This should display a white screen for 2 seconds
// compile with: gcc -o hello_sdl2 -lSDL2 hello_sdl2.c
// run with: ./hello_sdl2
#include <SDL2/SDL.h>

#include <stdio.h>

#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480

int main(int argc, char * args[]) {
    SDL_Window * window = NULL;
    SDL_Surface * screenSurface = NULL;
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "could not initialize sdl2: %s\n", SDL_GetError());
        return 1;
    }
    window = SDL_CreateWindow(
        "hello_sdl2",
        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
        SCREEN_WIDTH, SCREEN_HEIGHT,
        SDL_WINDOW_SHOWN
    );
    if (window == NULL) {
        fprintf(stderr, "could not create window: %s\n", SDL_GetError());
        return 1;
    }
    screenSurface = SDL_GetWindowSurface(window);
    SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface -> format, 0xFF, 0xFF, 0xFF));
    SDL_UpdateWindowSurface(window);
    SDL_Delay(2000);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}