如何用sdl2快速绘制像素网格？

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);
    // ...
    return 0;
}

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);
    
    SDL_Window* window = SDL_CreateWindow("Pixel Grid", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
    
    // ...
    
    return 0;
}

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);
    
    SDL_Window* window = SDL_CreateWindow("Pixel Grid", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
    
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255); // 设置绘制颜色为白色
    SDL_RenderClear(renderer); // 清空渲染器
    
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); // 设置绘制颜色为黑色
    
    int gridSize = 10; // 网格大小
    int screenWidth = 800;
    int screenHeight = 600;
    
    for (int x = 0; x < screenWidth; x += gridSize) {
        for (int y = 0; y < screenHeight; y += gridSize) {
            SDL_RenderDrawPoint(renderer, x, y); // 绘制像素点
        }
    }
    
    SDL_RenderPresent(renderer); // 更新渲染器
    
    SDL_Delay(2000); // 延迟2秒，以便观察绘制结果
    
    SDL_DestroyRenderer(renderer); // 销毁渲染器
    SDL_DestroyWindow(window); // 销毁窗口
    
    SDL_Quit(); // 退出SDL2
    
    return 0;
}