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List:       kde-kimageshop
Subject:    Re: 30-bit displaying with Krita?
From:       Adrian Page <adrian () pagenet ! plus ! com>
Date:       2009-12-29 13:01:27
Message-ID: 80ACB022-4C6F-44CD-A5E0-95C31350B5CD () pagenet ! plus ! com
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On 29 Dec 2009, at 12:14PM, Boudewijn Rempt wrote:

> On Tuesday 29 December 2009, LukasT.dev@gmail.com wrote:
> > On Tuesday 29 December 2009 09:06:20 Boudewijn Rempt wrote:
> > > On Friday 25 December 2009, Adrian Page wrote:
> > > > It will also be necessary to request a 10-bit visual when the OpenGL
> > > > context is created. Without that, there's likely no benefit in storing
> > > > the data in greater than 8 bits as it will just get converted to 8-bit
> > > > when written to the frame buffer, unless the card opts to dither (my
> > > > Nvidia card doesn't).
> > > 
> > > Is that actually doable with QGlWidget? I've tried to find something in
> > > the Qt docs, but I cannot figure it out.
> > 
> > Creating OpenGL rendering context with Qt is described here
> > 
> > http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=
> > 262519 _______________________________________________
> 
> That doesn't look too good...

I'm not sure why those examples are doing things at that low a level. Qt has a \
QGLFormat class that you can use to set the context format before it's created. That \
class includes options to set the red/green/blue channel sizes, which is what we'd \
want to change. See http://doc.trolltech.com/4.6/qglformat.html#setDefaultFormat. 

Note that only graphics cards supporting 30-bit mode will allow you to create a \
30-bit context, so this will be difficult to test.

Adrian

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