XMUNIBBLE4::XMUNIBBLE4(constfloat*) function (directxpackedvector.h)

Initializes a new instance of XMUNIBBLE4 from a four element float array argument.

This constructor initializes a new instance of XMUNIBBLE4 from a from a four element float array argument.

Syntax

void XMUNIBBLE4(
  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 XMUNIBBLE4.

Return value

None

Remarks

Array elements are mapped to the vector components of a new instance of XMUNIBBLE4 as follows:

Elements of pArray will be clamped to the permitted range prior to assignment to the appropriate member of XMUNIBBLE4.

The following pseudocode demonstrates the operation of this constructor, which takes advantage of the union of the four components of the XMUNIBBLE4 vector with an instance of uint16_t in the definition of the structure:

XMUNIBBLE4 instance;
_x1=min( max( pArray[0], 0 ), 15.0 );
_y1=min( max( pArray[1], 0 ), 15.0 );
_z1=min( max( pArray[2], 0 ), 15.0 );
_w1=min( max( pArray[3], 0 ), 15.0 );

instance.v =  ( (uint16_t)_w1 << 12) |
                (((uint16_t)_z1 & 0xF) << 8) |
                (((uint16_t)_y1 & 0xF) << 4) |
                (((uint16_t)_x1 & 0xF));

Requirements

See also

XMUNIBBLE4

XMUNIBBLE4 Constructors