问SDL窗口根本不显示

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

int main(int argc, char* argv[]) {

SDL_Window *window;                    // Declare a pointer

SDL_Init(SDL_INIT_VIDEO);              // Initialize SDL2

// Create an application window with the following settings:
window = SDL_CreateWindow(
    "An SDL2 window",                  // window title
    SDL_WINDOWPOS_UNDEFINED,           // initial x position
    SDL_WINDOWPOS_UNDEFINED,           // initial y position
    640,                               // width, in pixels
    480,                               // height, in pixels
    SDL_WINDOW_OPENGL                  // flags - see below
);

// Check that the window was successfully created
if (window == NULL) {
    // In the case that the window could not be made...
    printf("Could not create window: %s\n", SDL_GetError());
    return 1;
}

// A basic main loop to prevent blocking
bool is_running = true;
SDL_Event event;
while (is_running) {
    while (SDL_PollEvent(&event)) {
        if (event.type == SDL_QUIT) {
            is_running = false;
        }
    }
    SDL_Delay(16);
}

// Close and destroy the window
SDL_DestroyWindow(window);

// Clean up
SDL_Quit();
return 0;

}