Hi Robert,
OK, I see, however I ran into troubles using CUDA together with doubles in
viewports. The problem is that CUDA compiler invokes gcc with -malign-double
parameter, which isn't the same as for osg. Hence whenever I want to access the
values of a viewport in a CUDA code (actually C-code compiled with gcc by cuda
compiler) I am not able to get proper values out of it. Hence one of the
applications (either CUDA compiler ;) ) or OSG has to go in the direction of
the other by either removing -malign-doubles (which I think wouldn't be done so
easyly) or by adding this parameter to OSG compilation. However the second case
isn't also a good solution, I think.
I tried to implement the viewport with int and it works fine. I think also
using floats instead of doubles would be also fine (because no alignment is
needed). Currently I am checking the case with float and also want to try to
compile osg with -malign-doubles. Let see if it does help. I would let you know
more soon...
Art
--- Robert Osfield <[EMAIL PROTECTED]> schrieb am So, 30.11.2008:
> Von: Robert Osfield <[EMAIL PROTECTED]>
> Betreff: Re: [osg-users] osg::Viewport doubles???
> An: [EMAIL PROTECTED], "OpenSceneGraph Users"
> <osg-users@lists.openscenegraph.org>
> Datum: Sonntag, 30. November 2008, 17:17
> Hi Art,
>
> On Sun, Nov 30, 2008 at 3:59 PM, Art Tevs
> <[EMAIL PROTECTED]> wrote:
> > Shouldn't then the method, which scales the
> viewport, take care of casting?
> > Because based on OpenGL Specification viewport is per
> definition an integer value.
>
> Not quite, it's not about passing data to OpenGL,
> it's about handling
> resizing down and back up again of viewports, if you do
> this with
> int's then you can never recover the original size of
> the viewport
> because of rounding.
>
> Robert.
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