Can you use XMMATRIX and XMVECTOR for storage?

Started by mrheisenberg, Nov 07 2012 02:09 PM

DirectXMath xnamath SIMD math storage

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#1 mrheisenberg Members - Reputation: 332

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Posted 07 November 2012 - 02:09 PM

In a lot of situations if would find it more convenient to keep my data in a XMMATRIX or XMVECTOR format,intead of storing it back to a XMFLOAT*** structure.

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#2 MikeBMcL Members - Reputation: 171

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Posted 07 November 2012 - 07:21 PM

You can but you need to be careful about alignment issues. XMMATRIX and XMVECTOR need to be 16-byte aligned. See here for more on it: http://msdn.microsoft.com/en-us/library/ee418732(VS.85).aspx#Properly_Align_Alloc . You can see an example of how to deal with a 'new' alignment in the SpriteBatch class in DirectXTK - http://directxtk.codeplex.com/ - and its AlignedNew.h header file.

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