XMUDEC4::XMUDEC4(constfloat*) function (directxpackedvector.h)
Initializes a new instance of XMUDEC4 from a four element float array argument.
This constructor initializes a new instance of XMUDEC4 from a four element float array argument.
Syntax
void XMUDEC4(
const float *pArray
) noexcept;
Parameters
pArray
Four element floating point array containing the values used to initialize the four components of a new instance of XMUDEC4.
Return value
None
Remarks
As XMUDEC4 represents a four component integer vector, the fractional part of an element of pArray will be truncated.
Array elements are mapped to the vector components of a new instance of XMUDEC4 as follows:
| XMUDEC4 Member | Array Element | Range |
|---|---|---|
| x | pArray[0] | -0.0, 1023.0 |
| y | pArray[1] | -0.0, 1023.0 |
| z | pArray[2] | -0.0, 1023.0 |
| w | pArray[3] | 0, 3 |
Elements of pArray will be clamped to the permitted range prior to assignment to the appropriate member of XMUDEC4.
The following pseudocode demonstrates the operation of this constructor, which takes advantage of the union of the four components of the XMUDEC4 vector with an instance of uint32_t in the definition of the structure:
XMUDEC4 instance;
_x1=min( max( pArray[0], 0.0 ), 1023.0 );
_y1=min( max( pArray[1], 0.0 ), 1023.0 );
_z1=min( max( pArray[2], 0.0 ), 1023.0 );
_w1=min( max( pArray[3], 0.0 ), 3.0 );
instance.v = ( (uint32_t)_w1 << 30) |
(((uint32_t)_z1 & 0x3FF) << 20) |
(((uint32_t)_y1 & 0x3FF) << 10) |
(((uint32_t)_x1 & 0x3FF));
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | directxpackedvector.h |