Fixed vs. Floating-Point Math
4/19/2010
Generally, it is much faster for the Windows Mobile device CPU to use fixed-point math instead of emulating floating-point math. Therefore, the design of the Direct3D Mobile library supports both number types.
Support for Fixed-Point Math in Direct3D
Since the Windows Mobile Version 5.0 release, Direct3D mobile has supported fixed-point math.
For more information about how to use Direct3D Mobile with fixed-point data, see D3D Fixed Point Data.
For more information about Windows Mobile device development, see this Mic.