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Direct3D vs. doubles

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Is it true that Direct3D disables doubles? I mean I'm almost sure it is so, but it is a problem to me: I'm creating a graphing tool with high precision (its input are latitude/longitude of a point in degrees). I found that setting precision back to 64 deals with the problem:
_control87 ( _PC_64, _MCW_PC );
The question is: can I do this only after Direct3D/device creation?

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You might want to specify D3DCREATE_FPU_PRESERVE when you create your device. This tells D3D to save and restore the FPU state before and after each call into the API.

xyzzy

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.NET performance docs say that double is the fastest floating-point type because apparantly processors' FPUs have been 64-bit for a while. Is that true?

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