利用图元建模,绘制闹钟,要求闹钟时间与计算机系统时间同步-The use of graphic element modeling, rendering an alarm clock, alarm clock, the time requirements of computer systems and time synchronization

Opengl写的一个闹钟，闹钟时间与电脑时间相同-a alarm clock, alarm clock the same time and computer time