Edit

XMBYTEN4::XMBYTEN4(float,float,float,float) function (directxpackedvector.h)

  • Article

Initializes a new instance of XMBYTEN4 from four float arguments.

This constructor initializes a new instance of XMBYTEN4 from four float arguments.

Note  This constructor is only available under C++.
 

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

XMBYTEN4

XMBYTEN4 Constructors