DirectXMath Library Structures

The DirectXMath Library provides a number of structures and defined types to encapsulate data to support ease of use, optimization, and portability. The following list includes structures currently part of the DirectXMath Library. They are available through DirectXMath.h.

Structures

Name	Description
XMBYTE2	A 2D vector where each component is a signed integer, 8-bits (1 byte) in length.
XMBYTE4	A 4D vector where each component is a signed integer, 8-bits (1 byte) in length.
XMBYTEN2	A 2D vector for storing signed, normalized values as signed 8-bits (1 byte) integers.
XMBYTEN4	A 4D vector for storing signed, normalized values as signed 8-bits (1 byte) integers.
XMCOLOR	A 32-bit Alpha Red Green Blue (ARGB) color vector, where each color channel is specified as an unsigned 8 bit integer.
XMDEC4	A 4D vector with x-, y-, and z-components represented as 10 bit signed integer values, and the w-component as a 2 bit signed integer value.
XMDECN4	A 4D vector for storing signed, normalized values as 10 bit signed x-,y-, and z- components and a 2 bit signed w-component.
XMFLOAT2	A 2D vector consisting of two single-precision floating-point values.For a list of additional functionality such as constructors and operators that are available using XMFLOAT2 when you are programming in C++, see XMFLOAT2 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT2A	Describes an XMFLOAT2 structure aligned on a 16-byte boundary. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT3	Describes a 3D vector consisting of three single-precision floating-point values.For a list of additional functionality such as constructors and operators that are available using XMFLOAT3 when you are programming in C++, see XMFLOAT3 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT3A	Describes an XMFLOAT3 structure aligned on a 16-byte boundary. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT,and DXGI_FORMAT objects.
XMFLOAT3PK	Describes a 3D vector with X and Y components stored as 11-bit floating point number, and Z component stored as a 10-bit floating-point value.
XMFLOAT3SE	Describes a 3D vector of three floating-point components with 9 bit mantissas, each sharing the same 5-bit exponent.
XMFLOAT3X3	A 3*3 floating point matrix.For a list of additional functionality such as constructors and operators that are available using XMFLOAT3X3 when you are programming in C++, see XMFLOAT3X3 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4	Describes a 4D vector consisting of four single-precision floating-point values. For a list of additional functionality such as constructors and operators that are available using XMFLOAT4 when you are programming in C++, see XMFLOAT4 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4A	Describes an XMFLOAT4 structure aligned on a 16-byte boundary. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4X3	A 4*3 floating point matrix.For a list of additional functionality such as constructors and operators that are available using XMFLOAT4X3 when you are programming in C++, see XMFLOAT4X3 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4X3A	Describes an XMFLOAT4X3 structure aligned on a 16-byte boundary. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4X4	A 4*4 floating point matrix.For a list of additional functionality such as constructors and operators that are available using XMFLOAT4X4 when you are programming in C++, see XMFLOAT4X4 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMFLOAT4X4A	Describes an XMFLOAT4X4 structure aligned on a 16-byte boundary. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMHALF2	A 2D vector consisting of two half-precision (16bit) floating-point values.
XMHALF4	Describes a 4D vector consisting of four half-precision (16-bit) floating-point values.
XMINT2	A 2D vector where each component is a signed integer.For a list of more functionality such as constructors and operators that are available using XMINT2 when you are programming in C++, see XMINT2 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMINT3	A 3D vector where each component is a signed integer.For a list of more functionality such as constructors and operators that are available using XMINT3 when you are programming in C++, see XMINT3 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMINT4	A 4D vector where each component is a signed integer.For a list of more functionality such as constructors and operators that are available using XMINT4 when you are programming in C++, see XMINT4 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMMATRIX	Describes a 4*4 matrix aligned on a 16-byte boundary that maps to four hardware vector registers.For a list of additional functionality such as constructors and operators that are available using XMMATRIX when you are programming in C++, see XMMATRIX Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMSHORT2	Describes a 2D vector consisting of 16-bit signed and normalized integer components.
XMSHORT4	A 4D vector consisting of 16-bit signed integer components.
XMSHORTN2	A 2D vector for storing signed, normalized values as signed 16-bit integers (type int16_t).
XMSHORTN4	A 4D vector for storing signed, normalized values as signed 16-bit integers, (type int16_t).
XMU555	A 4D vector with x-,y-, and z- components represented as 5 bit unsigned integer values, and the w-component as a 1 bit integer value.
XMU565	A 3D vector with x- and z- components represented as 5-bit unsigned integer values, and the y- component as a 6-bit unsigned integer value.
XMUBYTE2	Describes a 2D vector where each component is a unsigned integer, 8-bits (1 byte) in length.A 2D vector where each component is a unsigned integer, 8-bits (1 byte) in length.
XMUBYTE4	Describes a 4D vector where each component is a unsigned integer, 8-bits (1 byte) in length. A 4D vector where each component is a unsigned integer, 8-bits (1 byte) in length.
XMUBYTEN2	A 2D vector for storing unsigned, normalized values as signed 8-bits (1 byte) integers.
XMUBYTEN4	A 4D vector for storing unsigned, normalized values as signed 8-bits (1 byte) integers.
XMUDEC4	A 4D vector with x-,y-, and z- components represented as 10 bit unsigned integer values, and the w-component as a 2 bit unsigned integer value.
XMUDECN4	A 4D vector for storing unsigned, normalized integer values as 10 bit unsigned x-, y-, and z-components and a 2-bit unsigned w-component.
XMUINT2	A 2D vector where each component is an unsigned integer.For a list of additional functionality such as constructors and operators that are available using XMUINT2 when you are programming in C++, see XMUINT2 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMUINT3	A 3D vector where each component is an unsigned integer.For a list of additional functionality such as constructors and operators that are available using XMUINT3 when you are programming in C++, see XMUINT3 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMUINT4	A 4D vector where each component is an unsigned integer.For a list of additional functionality such as constructors and operators that are available using XMUINT4 when you are programming in C++, see XMUINT4 Extensions. Note See DirectXMath Library Type Equivalences for information about equivalent D3DDECLTYPE, D3DFORMAT, and DXGI_FORMAT objects.
XMUNIBBLE4	A 4D vector with four unsigned 4-bit integer components.
XMUSHORT2	Describes a 2D vector consisting of 16-bit unsigned integer components.
XMUSHORT4	A 4D vector consisting of 16-bit unsigned integer components.
XMUSHORTN2	A 2D vector for storing unsigned, normalized values as unsigned 16-bit integers, (type uint16_t).
XMUSHORTN4	A 4D vector for storing unsigned, normalized values as signed 16-bit integers (type uint16_t).
XMXDEC4	A 4D vector with x-,y-, and z- components represented as 10 bit signed integer values, and the w-component as a 2 bit unsigned integer value.
XMXDECN4	A 4D vector for storing signed, normalized values as 10 bit signed x-,y-, and z- components and an unsigned, normalized value as 2 bit unsigned w-component.