为什么SDL2窗口会淡出?

我想快速解决这个问题:

我编写了一个简单的程序来处理SDL2库。青色框沿蓝色背景从左向右移动。然后车窗关闭。

问题是程序运行时窗口的颜色“淡出”。对比度明显降低,很烦人。有时候当盒子在窗户中间的时候就会发生这种情况。有时当盒子到达窗口的右侧时会发生这种情况。有时候根本不会发生。这种颜色的褪色似乎是零星和随机的。这是一个运行时问题。理论上,我看不出代码有任何问题。怎么了?

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

#ifdef __cplusplus
  extern "C"
#endif
int main(int argc, char* argv[])
{
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window*   window = NULL;
    SDL_Renderer* renderer = NULL;

    window = SDL_CreateWindow("Boxes", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, 0);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

    SDL_Rect myBox = { 200, 150, 50, 50  };

    int go = 0;
    while (go <= 590) {
      myBox.x = go;

      SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);

      SDL_RenderClear(renderer);

      SDL_SetRenderDrawColor(renderer, 0, 255, 255, 255);

      SDL_RenderFillRect(renderer, &myBox);

      SDL_RenderPresent(renderer);

      if (go == 0)
        SDL_Delay(2000);

      SDL_Delay(100);

      go += 10;
    }

    SDL_Delay(2000);

    SDL_DestroyWindow(window);
    SDL_DestroyRenderer(renderer);

    SDL_Quit();

    return EXIT_SUCCESS;
}