[vtk-developers] vtkGenericOpenGLRenderWindow thoughts

[Francois Bertel]

> MakeCurrent() is stubbed (along with the majority of the pure virtual
> functions), and the caller of vtkGenericRenderWindow::Render() makes the
> context current.

You cannot do the assumption. There are case where you are in the
middle of rendering, you invoke a progress event, some callback
actually refresh some other window, so can change the context. After
you invoke the progress event, you must
call MakeCurrent().

On Tue, May 25, 2010 at 2:21 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> I think that a vtkGenericOpenGLRenderWindow would be very useful.
> Things like MakeCurrent() can be implemented via callbacks, in fact
> vtkGenericOpenGLRenderWindow would need far fewer callbacks than e.g.
> vtkGenericRenderWindowInteractor.
>
>   David
>
>
> On Tue, May 25, 2010 at 11:39 AM, Francois Bertel
> <francois.bertel at kitware.com> wrote:
>> Hi,
>>
>> Can you please elaborate about the OpenGL functionality in Qt you want to use?
>>
>> How would you do a vtkGenericOpenGLRenderWindow? How to pass context
>> information? How would you implement MakeCurrent(), for example?
>>
>> On Tue, May 25, 2010 at 1:27 PM, Clinton Stimpson <clinton at elemtech.com> wrote:
>>> Hi,
>>>
>>> Does anyone see any issues with having a class vtkGenericOpenGLRenderWindow in
>>> VTK which would allow one to render a VTK scene into a drawable & context of
>>> their own?
>>>
>>> The reason I'm looking at this is because there is a great deal of OpenGL
>>> functionality in Qt that can easily be used with this approach.  The code in
>>> interest is not in a public api and is accessible only through using Qt's
>>> classes that manage drawables and contexts.
>>>
>>> I wonder if it'll be an issue as I'm seeing code in vtkCameraPass::Render that
>>> checks if its drawing to a framebuffer object, when it couldn't know if it is
>>> drawing to a framebuffer object created on the Qt side.
>>>
>>> Any thoughts?
>>>
>>> Thanks,
>>> Clint
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>>
>>
>>
>> --
>> François Bertel, PhD  | Kitware Inc. Suite 204
>> 1 (518) 371 3971 x113 | 28 Corporate Drive
>>                      | Clifton Park NY 12065, USA
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>



-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA