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On May 24, 2006, at 14:28, Richard Ranft wrote:

By using the
D3DCREATE_FPU_PRESERVE option when creating the D3D device, the
math.random problem vanished.
What performance impact - if any - has this caused?  Microsoft's docs
mention an unspecified performance hit and I'm wondering if anyone has
actually noticed how bad (or not) that it is.
D3DCREATE_FPU_PRESERVE correctly preserves the FPU state.  Without it, 
the state is not preserved.
One is correct, the other is not.  Who cares about the performance 
impact.
David Jones