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XMUDECN4::XMUDECN4(constfloat*) function (directxpackedvector.h)

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Initializes a new instance of XMUDECN4 from a four element float array argument.

This constructor initializes a new instance of XMUDECN4 from a four element float array argument.

Note  This constructor is only available under C++.

Syntax

void XMUDECN4(
  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 XMUDECN4.

Return value

None

Remarks

Array elements are mapped to the vector components of a new instance of XMUDECN4 as follows:

Vector Component Array Element Range Description
x pArray[0] 0.0, 1.0 During instantiation, pArray[0] is clamped between 0 and 1, multiplied by 1023.0f and assigned to x.
y pArray[1] 0.0, 1.0 During instantiation, pArray[1] is clamped between 0 and 1, multiplied by 1023.0f, and then assigned to y.
z pArray[2] 0.0, 1.0 During instantiation, pArray[2] is clamped between 0 and 1, multiplied by 1023.0f, 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 XMUDECN4, it is multiplied by 3.0f and then stored as the w member of the structure. 
XMUDECN4 instance;
_x1=min( max( pArray[0], 0.0 ), 1.0 );
_y1=min( max( pArray[1], 0.0 ), 1.0 );
_z1=min( max( pArray[2], 0.0 ), 1.0 );
_w1=min( max( pArray[3], 0.0 ), 1.0 );
_x = round( _x *  1023.0f);
_y = round( _y *  1023.0f);
_z = round( _z *  1023.0f);
_w = round( _w *  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

XMUDECN4

XMUDECN4 Constructors