Hello Georg,
On 06.06.2010 11:06, Georg Wünsch wrote:
> I have nothing to contribute to that particular question but... sorry an
> important question that came back to me when I read these mailings.
ok, to make life easier for others when searching the list archive in
the future it is helpful if you start a new thread and adjust the
subject line. Thanks!
> What is the best way of porting a 32 bit opensg 1.8 app to 64bit& OpenSG
> 2.0 lateron?
>
> First port to 2.0 then to 64bit or the other way round or all together in
> one step?
I wouldn't expect much 32/64 bit porting to be involved. The OpenSG data
types all have an explicit number of bits (OSG::UInt32, OSG::Real32) so
the data does normally not change size.
Even if you are not using OpenSG types but float/double directly, those
types do not change size when switching to 64 bit.
> Some more stupid questions I am considering:
> How does the graphics hardware behave when it is corresponding with a 64bit
> application.
the hardware mostly sees the data you upload to it and the OpenGL
interfaces specify what data type you upload.
> Is that happening behind the scenes or do I have to take care
> and think about every type of data - if they need to be converted or not?
hm, I'm confused, what data do you expect needs conversion?
> E.g. do I have to convert trimesh data from float to double?
that is independent of having a 32/64 bit application, so no you just
keep on using floats if there is no other reason (like higher precision
requirements) to switch.
> Do I need to
> keep the data as 64 bit values in Opensg already? Does the graphics card
> work in 64bit or 32 bit at all?
More recent hardware has gotten better dealing with double data without
performance loss (mostly driven by the compute APIs CUDA/OpenCL etc.),
I'm not sure if it can handle it without penalty in all cases yet.
Cheers,
Carsten
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