表示顶点缓冲区要求动态使用内存，这样对驱动程序有好处，因为这样可以使驱动程序确定缓冲区的放置位置。
Dynamic Indicates that the vertex buffer requires dynamic memory use, which is useful for drivers because it enables them to determine where to place the buffer.
顶点数据既可以由数据缓冲区提供，也可以由图元镶嵌引擎提供。
Data can be supplied either by the vertex buffer or by the primitive tessellation engine.
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