用此函数来获取从SDL库初始化来所经历过的时间，单位为微秒。返回是unsigned 32-bit类型。

unsigned int lastTime = 0, currentTime;
while (!quit) {
  // do stuff
  // ...

  // Print a report once per second
  currentTime = SDL_GetTicks();
  if (currentTime > lastTime + 1000) {
    printf("Report: %d\n", variable);
    lastTime = currentTime;
  }
}

http://blog.csdn.net/finewind/article/details/40391423

蔡军生

http://blog.csdn.net/caimouse/article/details/51749579