superbuild/modules/SDL2/cmake/test/main_gui.c

#include "SDL.h"
#include <stdio.h>

int main(int argc, char *argv[]) {
    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,
            640, 480,
            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(100);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}