XMFLOAT3PK::XMFLOAT3PK(constfloat*) function (directxpackedvector.h)
Initializes a new instance of XMFLOAT3PK from a three element float array argument.
This constructor initializes a new instance of XMFLOAT3PK from a three element float array argument.
Syntax
void XMFLOAT3PK(
const float *pArray
) noexcept;
Parameters
pArray
Three element floating point array containing the values used to initialize the three components of a new instance of XMFLOAT3PK.
Return value
None
Remarks
Values contained in pArray[0] and pArray[1] are stored, respectively, in the x-component and the y-component of the new instance of XMFLOAT3PK.
The values obtained from pArray[0] and pArray[1] are transformed from the standard 32 bit floating point format (sign bit, 8 bit exponent, 23 bit mantissa), and stored as an 11 bit floating point format (5 bit exponent, 6 bit mantissa).
Value contained in pArray[2] is stored, in the Z-component the new instance of XMFLOAT3PK. The value obtained from pArray[2] is transformed from the standard 32-bit floating point format (sign bit, 8 bit exponent, 23 bit mantissa), and stored as a 10 bit floating point format (5 bit exponent, 5 bit mantissa).
As no target formats do not support a sign bit, all member of pArray must be greater than zero.
Because of the change in floating point format during the instantiation of an instance of XMFLOAT3PK by this constructor, some loss of precision can be expected.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | directxpackedvector.h |