XMXDECN4::XMXDECN4(constfloat*) function (directxpackedvector.h)
Initializes a new instance of XMXDECN4 from a four element float array argument.
This constructor initializes a new instance of XMXDECN4 from a four element float array argument.
Note This constructor is only available under C++.
Syntax
void XMXDECN4(
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 XMXDECN4.
Return value
None
Remarks
Array elements are mapped to the vector components of a new instance of XMXDECN4 as follows:
| Vector Component | Array Element | Range | Description |
|---|---|---|---|
| x | pArray[0] | -0.0, 1.0 | During instantiation, pArray[0] is clamped between -1 and 1, multiplied by 511.0f and assigned to x. |
| y | pArray[1] | -0.0, 1.0 | During instantiation, pArray[1] is clamped between -1 and 1, multiplied by 511.0f, and then assigned to y. |
| z | pArray[2] | -0.0, 1.0 | During instantiation, pArray[2] is clamped between -1 and 1, multiplied by 511.0f, and then assigned to z. |
| w | pArray[3] | 0.0, 1.0 | During instantiation, pArray[3] is clamped between 0 and 1, and then assigned to w. This argument should be between 0.0 and 1.0; during the instantiation of an instance of XMXDECN4, it is multiplied by 3.0f and then stored as the w member of the structure. |
XMXDECN4 instance;
_x1=min( max( pArray[0], -1.0 ), 1.0 );
_y1=min( max( pArray[1], -1.0 ), 1.0 );
_z1=min( max( pArray[2], -1.0 ), 1.0 );
_w1=min( max( pArray[3], 0.0 ), 1.0 );
_x1 = round( _x1 * 511.0f);
_y1 = round( _y1 * 511.0f);
_z1 = round( _z1 * 511.0f);
_w1 = round( _w1 * 3.0f);
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 |
See also
Reference