DirectX SDK (March 2009)

XNA Math provides developers a cross-platform native-code method of generating SIMD instructions without having to resort to special case code. Based on the Xbox 360 SDK's Xbox math library, this set of headers supports the most common vectorized math operations used in graphics and animation. The implementation supports Windows 32-bit (x86) and Windows 64-bit (x64) targets using SSE2 intrinsics, and is fully cross-platform with the optimized Xbox 360 XDK version.

DirectX SDK (June 2010)

XNA Math version 2.03 includes the following changes:

• Addition of XMVectorDivide to optimize SSE2 vector division operations
• Unified handling of floating-point specials between the Windows SSE2 and no-intrinsics implementations
• Use of Visual Studio style SAL annotations
• Modifications to the C++ declarations for XMFLOAT2A/3A/4A/4X3A/4X4A to better support these types in C++ templates

See this post for known issues.

July 2012

XNA Math version 2.05 includes the following changes (primarily to be more consistent with DirectXMath):

• Template forms have been added for XMVectorPermute, XMVectorSwizzle, XMVectorShiftLeft, XMVectorRotateLeft, XMVectorRotateRight, and XMVectorInsert
• The XM_STRICT_XMMATRIX compilation define has been added for opaque XMMATRIX.
• Stream stride and count arguments have been changed to size_t
• The pDeterminant parameter of XMMatrixInverse is now optional
• Additional operator= overloads for XMBYTEN4, XMBYTE4, XMUBYTEN4, and XMUBYTE4 types are now available

Code written to be portable between XNA Math and DirectXMath should make use of XM_STRICT_MATRIX & XM_STRICT_VECTOR4, and prefer the use of template forms (using 0-3 or 0-7 indices rather than XM_PERMUTE_* or XM_SWIZZLE_* constants).

See this post.

February 2011

XNA Math version 2.04 includes the following changes:

• Addition of new data types and associated load-store functions:
  • XMBYTEN2, XMBYTE2, XMUBYTEN2, XMUBYTE2
  • XMLoadByteN2, XMLoadByte2, XMLoadUByteN2, XMLoadUByte2
  • XMStoreByteN2, XMStoreByte2, XMStoreUByteN2, XMStoreUByte2
  • XMINT2, XMUINT2, XMINT3, XMUINT3, XMINT4, XMUINT4
  • XMLoadSInt2, XMLoadUInt2, XMLoadSInt3, XMLoadUInt3, XMLoadSInt4, XMLoadUInt4
  • XMStoreSInt2, XMStoreUInt2, XMStoreSInt3, XMStoreUInt3, XMStoreSInt4, XMStoreUInt4
• Marked most single-parameter C++ constructors with explicit keyword
• Corrected range issues with SSE implementations of XMVectorFloor and XMVectorCeiling

See this post.

DirectX SDK (February 2010)

A minor revision to the library (version 2.02), includes a number of customer-reported fixes, optimizations, and improvements. Included are notable fixes to XMStoreColor, XMQuaternionRotationMatrix, XMVectorATan2, and XMVectorATan2Est

DirectX SDK (August 2009)

XNA Math, version 2.01, now has new compiler directive, XM_STRICT_VECTOR4. This opt-in directive disallows the usage of XboxMath-like member accessors such as .x, .y, and .z. This makes it easier to write portable XNA Math code.

Additionally, XNA Math has added conversion support for the following Windows graphics formats:

• 16-bit color formats (565, 555X, 5551)
• 4-bits per channel color formats (4444)
• Unique Direct3D 10/11 formats (DXGI_FORMAT_R9G9B9E5_SHAREDEXP and DXGI_FORMAT_R11G11B10_FLOAT)

Windows SDK for Windows 8.1 (Spring 2015 Update)

DirectXMath 3.07 in VS 2013 Update 5 and VS 2015 RTM, the Windows phone 8.1 SDK Spring 2015 update, and the Windows 10 SDK (10240).

• Fix customer reported bugs in BoundingBox methods
• Fix customer reported bug in XMStoreFloat3SE
• Fix customer reported bug in XMVectorATan2, XMVectorATan2Est
• Fix customer reported bug in XMVectorRound

See this post.

This version is also available on NuGet.

Windows SDK For Windows 8 Developer Preview

New revision as DirectXMath (version 3.00) shipping in the ''VS 11 Developer Preview''.

• Renamed and reorganized the headers
• Introduced C++ namespaces (DirectX, DirectX::PackedVector)
• Removed the Xbox 360-specific GPU types (HENDN3, XMHEND3, XMUHENDN3, XMUHEND3, XMDHENN3, XMDHEN3, XMUDHENN3, XMUDHEN3, XMXICON4, XMXICO4, XMICON4, XMICO4, XMUICON4, XMUICO4)

See this post.

Windows SDK for Windows 8.1 Preview

DirectXMath 3.05 shipped in the Visual Studio 2013 Preview

• Use x86/x64 __vectorcall calling-convention when available (XM_CALLCONV, HXMVECTOR, FXMMATRIX introduced)
• Fixed bug with XMVectorFloor and XMVectorCeiling when given whole odd numbers (i.e. 105.0)
• Improved XMVectorRound algorithm
• ARM-NEON optimizations for XMVectorExp2, XMVectorLog2, XMVectorExpE, and XMVectorLogE
• ARM-NEON code paths use multiply-by-scalar intrinsics when supported
• Additional optimizations for ARM-NEON Stream functions
• Fixed potential warning C4723 using operator/ or operator/=

See this post

Windows SDK For Windows 8 Consumer Preview

DirectXMath shipping for ''VS 11 Beta''

• ARM-NEON intrinsics (selected by default for the ARM platform)
• reworked XMVectorPermute, change of XM_PERMUTE_ defines, removal of XMVectorPermuteControl
• Addition of XM_SWIZZLE_ defines
• Optimizations for transcendental functions
• Template forms for permute, swizzle, shift-left, rotate-left, rotation-right, and insert
• Removal of deprecated types and functions (XM_CACHE_LINE_SIZE define, XMVectorExpEst, XMVectorLogEst, XMVectorPowEst, XMVectorSinHEs, XMVectorCosHEst, XMVectorTanHEst, XMVector2InBoundsR, XMVector3InBoundsR, XMVector4InBoundsR)
• Removed XM_STRICT_VECTOR4; XMVECTOR in NO-INTRINSICS always defined without .x, .y, .z, .w, .v, or .u
• Additional bounding types
• SAL fixes and improvements

See this post.