[vtk-developers] OS X MultiSamples

[David E DeMarle]

About tests: most of the ones that rely on non-antialised rendering
(especially depth compositing) specifically turn it off. I suspect there
won't be any regressions.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Aug 6, 2013 at 5:23 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> On Tue, Aug 6, 2013 at 2:09 PM, Sean McBride <sean at rogue-research.com>
> wrote:
> > On Mon, 5 Aug 2013 16:41:22 -0600, David Gobbi said:
> >>Sample buffers supported in OS X since 10.2.  Is this safe on all OS X
> >>machines?  Is it possible that it could cause creation of the context
> >>to fail if the gfx card does not support sample buffers?
> >
> > As I know next to nothing about OpenGL (VTK is my abstraction :)) I
> can't speak to this change really... but some thoughts:
> >
> > - any performance change?
>
> Probably some, but none that I can perceive.  Multisamples have been
> on by default on all other platforms (including Carbon) since at least
> 2007.  Only Cocoa was left out.  It can be turned off.
>
> > - won't test output be slightly different, possibly requiring new
> baselines?
>
> It's doubtful that new baselines will be needed. This has already been
> dealt with for the other platforms, either by modifying the tests
> (i.e. turning off multisampling where it made a difference) or by
> uploading multiple regression images.
>
> > - as it's a behaviour change, we should probably put this in release
> notes or somewhere
>
> We can announce that antialiased rendering finally comes to VTK Cocoa,
> just 7 years after it came to all other VTK platforms.
>
> > - since those flags have been there since 10.2, I imagine any GPU
> supporting 10.5 or later (VTK 6's requirement) will support it
> > - I can try this change locally, once I get my app working with VTK 6...
>
> The change can easily be applied to a copy of the VTK 5 source, it's
> just 4 lines.  I plan to test it with some of my software (which is
> also based on VTK 5).  For rendering of wireframes it makes a huge
> difference to the quality of the rendering.
>
>  - David
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