#include <sdl2>

int main(int argc, char* argv[]) {
    // 复位 SDL
    SDL_Init(SDL_INIT_EVERYTHING);

    // 设定对话框
    SDL_Window* window = SDL_CreateWindow("帧率显示", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);

    // 初始化变量
    float fps = 0.0f;
    float seconds = 0.0f;
    Uint32 previous_time = SDL_GetTicks();

    // 运行游戏循环系统
    while (running) {
        // 3D渲染一帧
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);
        // ... 别的3D渲染编码 ...
        SDL_RenderPresent(renderer);

        // 测算帧时长
        Uint32 current_time = SDL_GetTicks();
        seconds = (float)(current_time - previous_time) / 1000.0f;
        previous_time = current_time;

        // 测算帧数
        fps = 1.0f / seconds;

        // 显示帧率
        char fps_text[16];
        sprintf(fps_text, "FPS: %.2f", fps);
        SDL_Color text_color = {255, 255, 255, 255};
        SDL_Surface* text_surface = TTF_RenderText_Solid(font, fps_text, text_color);
        SDL_Texture* text_texture = SDL_CreateTextureFromSurface(renderer, text_surface);
        SDL_FreeSurface(text_surface);
        SDL_Rect text_rect = {0, 0, text_surface-&gt;w, text_surface-&gt;h};
        SDL_RenderCopy(renderer, text_texture, NULL, &amp;text_rect);

        // 处理程序
        SDL_Event event;
        while (SDL_PollEvent(&amp;event)) {
            if (event.type == SDL_QUIT) {
                running = false;
            }
        }
    }

    // 消毁 SDL
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}</sdl2>