[Interest] Utilizing the GPU, how to start?

[Sean Harmer]

On 06/07/2016 10:41, John C. Turnbull wrote:
> Thanks - great to hear!
>
> I am a firm believer in the significance that Vulkan will play in the 
> future of GPU based applications.

That's also my view. However, we are not yet at the stage where the 
graphics API is the bottleneck for most work loads, especially with Qt 
Quick. Even in Qt 3D we are still bottle-necked by the CPU work that 
needs to be done prior to the CPU load of submitting the actual OpenGL 
calls.

For Qt Quick there is a lot of lower hanging fruit to be tackled than 
providing a Vulkan backend. Laszlo is doing great work in abstracting 
the Qt Quick renderer to make it work with other backends which will 
enable a Vulkan renderer in the future - along with DX12 and Metal.

Qt 3D already has an architecture that would make it relatively easy to 
add backends for other graphics API but again, we have plenty of other 
stuff to tackle before OpenGL becomes the bottleneck. Especially since 
Qt 3D can already take advantage of instanced rendering, compressed 
textures, texture arrays, UBOs and compute shaders. Until we can be 
convinced that Vulkan would remove a large bottle neck we will likely 
continue adding more features, examples, documentation, fixing bugs and 
optimising performance. But rest assured, Vulkan is on the radar.

Cheers,

Sean

>
> On 6 Jul 2016, at 18:33, Dmitry Volosnykh <dmitry.volosnykh at gmail.com 
> <mailto:dmitry.volosnykh at gmail.com>> wrote:
>
>> John, here you are: https://blog.qt.io/?s=vulkan&lang=en
>>
>> On Wed, Jul 6, 2016 at 11:31 AM John C. Turnbull 
>> <ozemale at ozemail.com.au <mailto:ozemale at ozemail.com.au>> wrote:
>>
>>     Just out of interest, has anyone within the Qt community or
>>     company considered Vulkan?
>>
>>     It looks to me as though the future of low level graphics APIs is
>>     not OpenGL or Direct3D or Metal.
>>
>>     It's Vulkan.
>>
>>     > On 6 Jul 2016, at 17:53, Kai Koehne <Kai.Koehne at qt.io
>>     <mailto:Kai.Koehne at qt.io>> wrote:
>>     >
>>     >
>>     >
>>     >> -----Original Message-----
>>     >> From: Interest [mailto:interest-bounces+kai.koehne
>>     <mailto:interest-bounces%2Bkai.koehne>=qt.io at qt-project.org
>>     <mailto:qt.io at qt-project.org>]
>>     >> [...]
>>     >> Multimedia and web rendering are a different story.  Others
>>     are better
>>     >> qualified to comment on the details of how WebEngine,
>>     QtMultimedia, and
>>     >> the older alternatives are implemented - but they are all
>>     wrappers around
>>     >> other libraries.  Just because widgets don’t render their own
>>     pixels on the
>>     >> GPU doesn’t mean those libraries can’t render the framed
>>     content on the
>>     >> GPU, AFAIK.  At least theoretically, but I’m not up-to-date on
>>     whether the
>>     >> widget implementations are currently doing that efficiently.
>>     >
>>     > QWeb_Engine_View indeed uses Qt Quick (and therefore potentially
>>     > the GPU) underneath , even for the widgets integration. So it
>>     might be worth
>>     > a try porting your app from Qt WebKit to Qt WebEngine (if only
>>     because
>>     > Qt WebKit is deprecated).
>>     >
>>     > For the video, it looks like QVideoWidget might benefit from
>>     OpenGL if
>>     > it's parent is a QOpenGL widget. Maybe you can experiment with
>>     this.
>>     > (I don't have first hand experience with QVideoWidget though).
>>     >
>>     >
>>     >
>>     > Regards
>>     >
>>     > Kai
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>>
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>
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