setMathControlState is not implemented on Mac, Linux, or X64 Windows

[jamesu]

Platform::setMathControlState does not appear to be implemented for Mac, Linux, or X64 Windows. This function turns out to be very important as otherwise you will get weird rounding errors on floating point operations during execution.

[jamesu]

Still not implemented it for x64 windows, though you should be able to use the same asm. Unless there is something blocking this?

[crabmusket]

Nothing blocking :).

[LuisAntonRebollo]

@jamesu, we really need to handle this FPU changes?

We use a flag for avoid DX9 change FPU precission, and new DX or OpenGL dont change precission.

[jamesu]

@LuisAntonRebollo yes, since the state of the FPU is not guaranteed across platforms (AFAIK). For instance on linux we had big problems with the precision of a float in an AI calculation causing a crash. Best to be explicit IMO ;)

[LuisAntonRebollo]

Ok,thx for info :)

Re-opened for future research.