关于Direct定点缓冲区的编程，对于要学习Directx编程的人很有参考作用！-Direct fixed-point buffer on the programming, programming for people who want to learn Directx useful reference!

z主要介绍directx9中定点变换等内容，列子较为详细。-z introduced in the fixed-point conversion and so on directx9, Liezi more detail.