[SDL] Floating data types...
MIGUEL ANGEL BLANCH LARDIN
x5101920 at fedro.ugr.es
Wed Jan 24 08:50:38 PST 2001
Mensaje citado por: Mattias Engdegård <f91-men at nada.kth.se>:
> > Are floating(double and long double too) data types the same on
> >platforms? That is do they all have the same mantissa, exponent,
> >endianess... I noticed SDL_net doesn't have any conversion methods
> >sending floats to machines of different endianess.
> 2 issues: byte order and fp format. Most contemporary machines use
> IEEE floats so you can safely spec that in a protocol. Use either 32
> or 64 bit floats; oddball ones like 80 (intel) or 128 (sun) are out,
> so are ancient stuff like ibm 360/VAX/Cray fp formats. You can
> probably use the ordinary byte order macros to convert endianness
> this is not guaranteed but true in reality
I know that Age of Kings are having a lot of problems due to float
point values, as not all the system ( and speaking on x86 system only
:-> ) compute the number in the same way.
To compute the value and having the same result on both system you are
going to need:
a) Same precision
b) Non buggy FPU
c) Good luck
But for common things there shouldn't be many problems.
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