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D3DXMATRIXA16 what "A16" mean?

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Original post by FReY
16 *byte* aligned.

The reason for the alignment is that it can be faster to use the matrix if it's aligned to a certain boundary. SSE2 and 3dNow! both need the matrix aligned. If it's not aligned, I'd guess that D3DX will either copy it to an aligned version, or it'll fallback and use some other method for changing the matrix (E.g. a plain x86 ASM version of a matrix multiply rather than an SSE2 one).

Basically, it's faster to use, but usually takes more memory.

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