XR_BIAS to Float Conversion Rules
This section applies only to Windows 7 and later operating systems.
The following code shows how to convert XR_BIAS to float:
float XRtoFloat( UINT XRComponent ) {
// The & 0x3ff shows that only 10 bits contribute to the conversion.
return (float)( (XRComponent & 0x3ff) - 0x180 ) / 510.f;
}