[Development] QtCS: OpenGL session notes

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To use Qml on Win8 Metro, we must have a directX backend (with or without
angle .. but it seems that for now angle is directX9 only and Metro need
DX11), and to be able to use qt5 qml for digital signage on low end
hardware ( in that case qt5 qml is just perfect...) we need to have
hardware accelerated video decoding (dxva) on Windows .. so it need to have
a way to bridge qml video to angle directx surface to have access to dxva

2012/6/27 Sean Harmer <sean.harmer at kdab.com>

> On Wednesday 27 June 2012 17:46:32 marius.storm-olsen at nokia.com wrote:
> > On 27/06/2012 12:14, ext Sean Harmer wrote:
> > > On Wednesday 27 June 2012 16:30:50 marius.storm-olsen at nokia.com
> > >
> > > wrote:
> > >> On 25/06/2012 13:44, ext Girish Ramakrishnan wrote:
> > >>> Future plans - Desktop OpenGL 3+ support, ES 3 support
> > >>
> > >> We've just added ANGLE support in Qt (-angle <dir>), to enable
> > >> DirectX usage instead of OpenGL ES 2 on Windows, due to many buggy
> > >> drivers.
> > >
> > > You mean for embedded flavours of Windows right? OpenGL 3+ works fine
> > > on desktop windows - although getting hold of a Core Profile context
> > > on Windows via Qt was broken last time I tried it (but that was some
> > > months ago).
> >
> > No, I don't mean for embedded alone. Desktop OpenGL drivers are also of
> > quite varying quality, and the DirectX drivers are usually better.
>
> I only have access to nVidia boards at present so can't comment on the
> other
> manufacturer's driver quality/completeness.
>
> > Not to mention that with Windows 8 you might have a hard time getting
> > access to the OpenGL APIs, depending on which system you are on and how
> > integrated you want to be.
> >
> > No WGL/EGL support for Metro applications afaik, see
> > http://msdn.microsoft.com/en-us/library/windows/apps/br205756.aspx and
> >
> http://social.msdn.microsoft.com/Forums/en-US/winappswithnativecode/thread/c
> > 77de65a-1fbb-491f-9f6b-0c4a7b452ec2 and
> >
> http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/a861d
> > b02-dce8-4f61-9969-b8a7a7cd55c7
> >
> > (Yes, non-Metro apps can use OpenGL just fine, although reports have
> > come back that currently the OpenGL drivers are lagging behind the
> > DirectX ones.)
> >
> > No OpenGL for Windows 8 RT (ARM) version either, which should also be a
> > target.
>
> Hmmm, I've not played with Win 8 at all yet. No OpenGL on Metro style apps
> of
> Win8 Arm is indeed a PITA. Thanks for the info.
>
> Sean
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