XMBYTEN4 union

A 3D vector for storing signed, normalized values as signed 8-bits (1 byte) integers.

For a list of additional functionality such as constructors and operators that are available using XMBYTEN4 when you are programming in C++, see XMBYTEN4 Extensions.

Syntax

union XMBYTEN4 {
  union {
    struct {
      int8_t x;
      int8_t y;
      int8_t z;
      int8_t w;
    };
    uint32_t v;
  };
};

Members

x

Signed 8-bit integer value in the range [-127, 127] describing the x-coordinate of the vector.

y

Signed 8-bit integer value in the range [-127, 127] describing the y-coordinate of the vector.

z

Signed 8-bit integer value in the range [-127, 127] describing the z-coordinate of the vector.

w

Signed 8-bit integer value in the range [-127, 127] describing the w-coordinate of the vector.

v

Unsigned 32-bit integer representing the 4D vector.

Remarks

Those XMBYTEN4 constructors using floating point arguments require normalized input, which must be in the range of [0.0.-1.0]. During instantiation, these data are multiplied by 127.0f, results are rounded, and then assigned to the appropriate members of XMBYTEN4.

XMBYTEN4 can be used to load instances of XMVECTOR from normalized values, by using XMLoadByteN4, which divides each component 127.0f, rounds the result, and then assigns the components to an XMVECTOR instance.

XMVECTOR instances containing normalized values can be stored into XMBYTEN4 using XMStoreByteN4, which multiplies each component by 127.0f, rounding the result, before assigning the values to the appropriate XMBYTEN4 members.

Namespace: Use DirectX::PackedVector

Platform Requirements

Microsoft Visual Studio 2010 or Microsoft Visual Studio 2012 with the Windows SDK for Windows 8. Supported for Win32 desktop apps, Windows Store apps, and Windows Phone 8 apps.

Requirements

See also

DirectXMath Library Structures

XMBYTEN4 Extensions