XMBYTEN4::XMBYTEN4(float,float,float,float) function (directxpackedvector.h)
Initializes a new instance of XMBYTEN4 from four float arguments.
This constructor initializes a new instance of XMBYTEN4 from four
float arguments.
Syntax
void XMBYTEN4(
float _x,
float _y,
float _z,
float _w
) noexcept;
Parameters
_x
A normalized value for the x-coordinate of the vector.
This argument should be between -1.0 and 1.0. During the instantiation of
an instance of XMBYTEN4, it is multiplied by 127.0f and
then stored as the x member of the structure.
_y
A normalized value for the y-coordinate of the vector, the y of the
new instance of XMBYTEN4
This argument should be between -1.0 and 1.0. During the instantiation of
an instance of XMBYTEN4, it is multiplied by 127.0f and
then stored as the y member of the structure.
_z
A normalized value for the z-coordinate of the vector, the z of the
new instance of XMBYTEN4
This argument should be between -1.0 and 1.0. During the instantiation of
an instance of XMBYTEN4, it is multiplied by 127.0f and
then stored as the z member of the structure.
_w
A normalized value for the w-coordinate of the vector, the w of the
new instance of XMBYTEN4
This argument should be between -1.0 and 1.0. During the instantiation of
an instance of XMBYTEN4, it is multiplied by 127.0f and
then stored as the w member of the structure.
Return value
None
Remarks
The magnitude of each argument to the constructor will be clamped to the range supported by an 8-bit signed integer [-127.0, 127.0].
The following pseudocode demonstrates the operation of this constructor, which takes
advantage of the union of the four components of the XMBYTEN4 vector with an instance of uint32_t in the definition of the structure:
XMBYTEN4 instance;
_x1=min( max( _x, -1.0 ), 1.0 );
_y1=min( max( _y, -1.0 ), 1.0 );
_z1=min( max( _z, -1.0 ), 1.0 );
_w1=min( max( _w, -1.0 ), 1.0 );
_x1 = round( _x1 * 127.0f);
_y1 = round( _y1 * 127.0f);
_z1 = round( _z1 * 127.0f);
_w1 = round( _w1 * 127.0f);
instance.x = (int8_t)_x1;
instance.y = (int8_t)_y1;
instance.z = (int8_t)_z1;
instance.w = (int8_t)_w1;
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | directxpackedvector.h |
See also
Reference