Re: vector & matrix operations

Thx for your overview ...

> thats a lot of overhead for an add, and thats before the cost of the
> readback and readbacks are very expensive.

Well it is worth the effort if you want to use DirectX/the GPU to help the
CPU with a lot of complex matrix/vector calculations. I.e. if it takes a
relative long time before you do have data for the GPU to render and
display - so the GPU has to wait a long time until it is able to process new
data.
That's what I was looking for: using the GPU for some parallelized
calculations, that is to say load sharing for the mentioned calculations.

BTW: after looking into "d3dx9math.inl" I was really surprised that none of
the functions is optimized for SIMD operations. Compared to my existing SIMD
optimized algos the DirectX ops took at least twice the time ...

Regards,

--

DPR


.

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