[Interest] Qt3D - Render to QImage

Sean Harmer sean.harmer at kdab.com
Tue Dec 20 20:53:29 CET 2016


Thanks to Antti, this is already fixed in the 5.8 branch so will be part 
of Qt 5.8.1.

Cheers,

Sean

On 20/12/2016 12:48, Philip Schuchardt wrote:
> Awesome! Thanks Juan.
>
> On Mon, Dec 19, 2016 at 7:18 PM Juan Jose Casafranca <jjcasmar at gmail.com
> <mailto:jjcasmar at gmail.com>> wrote:
>
>     Hi,
>
>     I've began to look a the QRenderCapture code to implement the
>     QBufferCapture node and I've found that the problem that Philip
>     described may happen because of the render target format used.
>     The debugger says that the render target is a RGB8_UNorm which is
>     not considered in the big switch case statement in
>     graphicshelpers/graphicscontext.cpp file (line 1624).
>
>     I will file a jira with this info
>
>     2016-12-12 15:43 GMT+01:00 Philip Schuchardt <vpicaver at gmail.com
>     <mailto:vpicaver at gmail.com>>:
>
>         I'm using Scene3D in my QML application. Qt Quick is in charge.
>         The default format returns -1, -1, -1, and -1 for alpha, red,
>         green, and blue. I'm on macOS 10.12.1 with an AMD Radeon HD
>         6770M 1024 MB.
>
>         On Fri, Dec 9, 2016 at 3:26 AM Sean Harmer <sean.harmer at kdab.com
>         <mailto:sean.harmer at kdab.com>> wrote:
>
>
>
>             On 09/12/2016 00:28, Philip Schuchardt wrote:
>             > I figured out why it wasn't working for me. After using
>             the qt3d debug
>             > build, I noticed that Qt3D was asserting:
>             >
>             > ASSERT failure in Q_UNREACHABLE(): "Q_UNREACHABLE was
>             reached", file
>             > graphicshelpers/graphicscontext.cpp, line 1684
>             >
>             >
>             > Basically, it was telling me that it had an invalid
>             framebuffer type. I
>             > had multisampling enabled which would prevent direct reads
>             from a
>             > framebuffer. Multisampled framebuffers need to be copied
>             to a texture
>             > before reading to main memory. After disabling
>             multisampling, it still
>             > wasn't working.  Then I forced a new default format with
>             QSurfaceFormat:
>
>             Right. We could handle this multisample resolving internally
>             so please
>             do file a bug report for this. I also want to add a
>             framebuffer blit
>             framegraph node for 5.9 too as this has other uses outside
>             of RenderCapture.
>
>             >
>             >
>             > QSurfaceFormatformat=QSurfaceFormat::defaultFormat();
>             >
>             > format.setAlphaBufferSize(8);
>             >
>             > format.setRedBufferSize(8);
>             >
>             > format.setGreenBufferSize(8);
>             >
>             > format.setBlueBufferSize(8);
>             >
>             > QSurfaceFormat::setDefaultFormat(format);
>             >
>             >
>             > Then it worked! I tried re-enabling multisampling which
>             caused it not to
>             > work agian.
>             >
>             >
>             > I think there's currently two bugs for RenderCapture:
>             >
>             > 1. The default QSurfaceFormat doesn't work with
>             RenderCapture (on macOS
>             > 10.12.1)
>
>             What setup are you using? Qt QUick in charge + a Scene3D or
>             pure QT 3D
>             application? What is the default format you get in this case?
>
>             >
>             > 2. The multisampling (using Scene3D) doesn't work with
>             RenderCapture
>             >
>             >
>             > Sean, should I make a bug report?
>
>             Yes please :)
>
>             Thanks for investigating!
>
>             Sean
>
>             >
>             >
>             > Thanks,
>             >
>             > Phi|ip
>             >
>             >
>             > On Sat, Dec 3, 2016 at 4:16 PM Philip Schuchardt
>             <vpicaver at gmail.com <mailto:vpicaver at gmail.com>
>             > <mailto:vpicaver at gmail.com <mailto:vpicaver at gmail.com>>>
>             wrote:
>             >
>             >     I prototyped a framegraph using 5.8-beta and
>             RenderCapture, but was
>             >     unable to get anything to save to disk. It creates a
>             >     RenderCaptureReply. The reply gets completed but the
>             image is null
>             >     and nothing is saved. I'm currently saving to
>             "~/testShot.png".  Any
>             >     ideas why it's not working? I probably set up the
>             framegraph wrong
>             >     or something. I would be really helpful if there was
>             an example in
>             >     the documentation.
>             >
>             >     Here's my test example. You can run through Qt
>             Creators -> Tools ->
>             >     External -> Qt Quickt - > qmlscene
>             >
>              https://dl.dropboxusercontent.com/u/13470469/Renderer3D.qml
>             >
>             >     On Mon, Nov 28, 2016 at 11:33 AM Philip Schuchardt
>             >     <vpicaver at gmail.com <mailto:vpicaver at gmail.com>
>             <mailto:vpicaver at gmail.com <mailto:vpicaver at gmail.com>>> wrote:
>             >
>             >         Cool! I didn't see RenderCapture class in 5.7. I
>             glad it was
>             >         added in 5.8. I'll try to prototype something with
>             custom
>             >         framegraph in 5.8.
>             >
>             >         Phi|ip
>             >
>             >         On Mon, Nov 28, 2016 at 6:48 AM Juan Jose Casafranca
>             >         <jjcasmar at gmail.com <mailto:jjcasmar at gmail.com>
>             <mailto:jjcasmar at gmail.com <mailto:jjcasmar at gmail.com>>> wrote:
>             >
>             >             I will have a better look to how the aspect
>             translates the
>             >             framegraph node to opengl commands.
>             >
>             >             Thanks!
>             >
>             >             2016-11-28 12:42 GMT+01:00 Sean Harmer
>             <sean.harmer at kdab.com <mailto:sean.harmer at kdab.com>
>             >             <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>>>:
>             >
>             >                 On Monday 28 November 2016 12:34:01 Juan
>             Jose Casafranca
>             >                 wrote:
>             >                 > How does QRenderCapture works? When a
>             capture is requested it sets a flags
>             >                 > and when generating the view, it creates
>             a job that will render the image?
>             >                 > I imagine the QRenderCapture in the
>             framegraph is important. If you put it
>             >                 > right after the ClearBuffers, it will
>             render an empty image, wont it?
>             >
>             >                 I suspect the issue here is not being
>             clear on the frame
>             >                 graph. Each leaf node
>             >                 of the frame graph results in a phase of
>             rendering. The
>             >                 RenderCapture node
>             >                 essentially gets translated into a
>             glReadPixels call for
>             >                 that rendering phase.
>             >                 If the sub-tree containing the
>             ClearBuffers and
>             >                 RenderCapture also does some
>             >                 drawing (i.e. doesn't have a NoDraw node) the
>             >                 glReadPixels will happen after
>             >                 the draw calls so should read back the
>             framebuffer that
>             >                 has just been drawn
>             >                 to.
>             >
>             >                 Hope this helps,
>             >
>             >                 Sean
>             >
>             >                 >
>             >                 > 2016-11-28 12:11 GMT+01:00 Sean Harmer
>             >                 <sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com> <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>>>:
>             >                 > > On Monday 28 November 2016 11:48:14
>             Harald Vistnes
>             >                 wrote:
>             >                 > > > Hi,
>             >                 > > >
>             >                 > > > yes, this would be a most welcome
>             feature.
>             >                 > > >
>             >                 > > > Concerning Jira, it has already been
>             requested
>             >                 multiple times
>             >                 > > >
>             https://bugreports.qt.io/browse/QTBUG-52074
>             >                 > > >
>             https://bugreports.qt.io/browse/QTBUG-52136
>             >                 > >
>             >                 > > I meant for reading back from a buffer. :)
>             >                 > >
>             >                 > > > I tried to render into a FBO and
>             read back the
>             >                 results, but had some
>             >                 > > > problems. I attached some test code
>             in the Jira
>             >                 > > >
>             >
>              https://bugreports.qt.io/secure/attachment/57353/offscreenrenderer.zip
>             >                 > >
>             >                 > > but
>             >                 > >
>             >                 > > > never got any feedback. If someone
>             will look into
>             >                 this it would be
>             >                 > > > great.
>             >                 > >
>             >                 > > I'll see if someone can take a look. I
>             may have some
>             >                 time next week if
>             >                 > > nobody
>             >                 > > else can.
>             >                 > >
>             >                 > > Cheers,
>             >                 > >
>             >                 > > Sean
>             >                 > >
>             >                 > > > Thanks,
>             >                 > > > Harald
>             >                 > > >
>             >                 > > > 2016-11-28 11:41 GMT+01:00 Sean Harmer
>             >                 <sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com> <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>>>:
>             >                 > > > > On Monday 28 November 2016
>             11:40:10 Juan Jose
>             >                 Casafranca wrote:
>             >                 > > > > > Oh thanks!
>             >                 > > > > >
>             >                 > > > > > Yes, in fact my first thought
>             was to use it
>             >                 for a compute shader. It
>             >                 > > > >
>             >                 > > > > would
>             >                 > > > >
>             >                 > > > > > make Qt3D a great tool not only
>             for rendering
>             >                 but also for GPGPU.
>             >                 > > > > > I will try to have a look on it
>             during the
>             >                 Christmas vacations :-)
>             >                 > > > >
>             >                 > > > > Awesome! Drop by #qt-3d on irc if
>             you need anything.
>             >                 > > > >
>             >                 > > > > Cheers,
>             >                 > > > >
>             >                 > > > > Sean
>             >                 > > > >
>             >                 > > > > > 2016-11-28 11:31 GMT+01:00 Sean
>             Harmer
>             >                 <sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com> <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>>>:
>             >                 > > > > > > Hi,
>             >                 > > > > > >
>             >                 > > > > > > On Monday 28 November 2016
>             11:22:30 Juan
>             >                 Jose Casafranca wrote:
>             >                 > > > > > > > Hi Sean,
>             >                 > > > > > > >
>             >                 > > > > > > > is there any example on how
>             to do that? I
>             >                 tried to use a
>             >                 > > > >
>             >                 > > > > QRenderCapture
>             >                 > > > >
>             >                 > > > > > > but
>             >                 > > > > > >
>             >                 > > > > > > > I failed two weeks ago.
>             >                 > > > > > >
>             >                 > > > > > >
>             >
>              http://code.qt.io/cgit/qt/qt3d.git/tree/tests/manual/
>             >                 > >
>             >                 > > rendercapture-qml
>             >                 > >
>             >                 > > > > > >
>             >
>              http://code.qt.io/cgit/qt/qt3d.git/tree/tests/manual/
>             >                 > >
>             >                 > > rendercapture-cpp
>             >                 > >
>             >                 > > > > > > > Is there any way to access
>             the buffers
>             >                 content data using a
>             >                 > >
>             >                 > > similar
>             >                 > >
>             >                 > > > > > > > approach to the
>             QRenderCapture method?
>             >                 > > > > > > > For example, in an animation
>             system, use a
>             >                 graphics pipeline to
>             >                 > > > >
>             >                 > > > > compute
>             >                 > > > >
>             >                 > > > > > > the
>             >                 > > > > > >
>             >                 > > > > > > > deformed mesh and then get
>             the new vertex
>             >                 positions for export.
>             >                 > > > > > >
>             >                 > > > > > > Right, that is missing at the
>             moment. It
>             >                 would be very useful to
>             >                 > > > > > > be
>             >                 > > > >
>             >                 > > > > able
>             >                 > > > >
>             >                 > > > > > > to do
>             >                 > > > > > > this to read back the results
>             of a compute
>             >                 shader too for e.g.. If
>             >                 > >
>             >                 > > you
>             >                 > >
>             >                 > > > > > > wish to
>             >                 > > > > > > have a go at adding such a
>             feature analogous
>             >                 the the RenderCapture
>             >                 > > > > > > node
>             >                 > > > > > > then
>             >                 > > > > > > that would be awesome. If not,
>             we can try to
>             >                 do it for 5.9 but the
>             >                 > > > >
>             >                 > > > > feature
>             >                 > > > >
>             >                 > > > > > > freeze is approaching. In
>             either case could
>             >                 you file a JIRA for it
>             >                 > > > >
>             >                 > > > > please?
>             >                 > > > >
>             >                 > > > > > > Thanks!
>             >                 > > > > > >
>             >                 > > > > > > Sean
>             >                 > > > > > >
>             >                 > > > > > > > Cheers
>             >                 > > > > > > > Juan José
>             >                 > > > > > > >
>             >                 > > > > > > > 2016-11-28 11:13 GMT+01:00
>             Sean Harmer
>             >                 <sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com> <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>>>:
>             >                 > > > > > > > > On Monday 28 November 2016
>             02:23:59
>             >                 Philip Schuchardt wrote:
>             >                 > > > > > > > > > I'm trying to port my
>             OpenGL code (
>             >                 > >
>             >                 > > https://github.com/Cavewhere/
>             >                 > >
>             >                 > > > > > > > > cavewhere/)
>             >                 > > > > > > > >
>             >                 > > > > > > > > > to use Qt3D. I think
>             Qt3D will allow
>             >                 me to quickly improve
>             >                 > >
>             >                 > > and
>             >                 > >
>             >                 > > > > > > modify my
>             >                 > > > > > >
>             >                 > > > > > > > > > rendering pipeline. The one
>             >                 requirement I need is to be able
>             >                 > >
>             >                 > > to
>             >                 > >
>             >                 > > > > > > render
>             >                 > > > > > >
>             >                 > > > > > > > > to a
>             >                 > > > > > > > >
>             >                 > > > > > > > > > QImage and save it to
>             disk. Currently,
>             >                 have a method that
>             >                 > > > > > > > > > renders
>             >                 > > > > > > > > > high-resolution images
>             from OpenGL. I
>             >                 do this by tiling a
>             >                 > > > >
>             >                 > > > > projection
>             >                 > > > >
>             >                 > > > > > > > > matrix
>             >                 > > > > > > > >
>             >                 > > > > > > > > > and rendering the scene
>             one tile at a
>             >                 time and combining
>             >                 > > > > > > > > > them
>             >                 > > > >
>             >                 > > > > into
>             >                 > > > >
>             >                 > > > > > > > > > on
>             >                 > > > > > > > >
>             >                 > > > > > > > > huge
>             >                 > > > > > > > >
>             >                 > > > > > > > > > PNG. The problem is I'm
>             not sure how
>             >                 to render Qt3D pipeline
>             >                 > >
>             >                 > > to
>             >                 > >
>             >                 > > > > > > > > > a
>             >                 > > > > > > > > > texture
>             >                 > > > > > > > > > and then download if
>             from the GPU into
>             >                 memory in Qt3D. Is
>             >                 > >
>             >                 > > there
>             >                 > >
>             >                 > > > > an
>             >                 > > > >
>             >                 > > > > > > easy
>             >                 > > > > > >
>             >                 > > > > > > > > way
>             >                 > > > > > > > >
>             >                 > > > > > > > > > to do that? Do I need to
>             create my own
>             >                 Aspect?
>             >                 > > > > > > > >
>             >                 > > > > > > > > Hi, you can use a custom
>             frame graph
>             >                 that includes a
>             >                 > > > > > > > > QRenderCapture
>             >                 > > > > > >
>             >                 > > > > > > node
>             >                 > > > > > >
>             >                 > > > > > > > > (coming in Qt 5.8). If you
>             combine this
>             >                 with a camera and some
>             >                 > > > >
>             >                 > > > > logic
>             >                 > > > >
>             >                 > > > > > > for
>             >                 > > > > > >
>             >                 > > > > > > > > tiling the frustum
>             (NodeInstantiator)
>             >                 you should be able to
>             >                 > > > >
>             >                 > > > > replicate
>             >                 > > > >
>             >                 > > > > > > your
>             >                 > > > > > >
>             >                 > > > > > > > > existing logic. I'd like
>             to get
>             >                 something like this wrapped up
>             >                 > > > >
>             >                 > > > > along
>             >                 > > > >
>             >                 > > > > > > with
>             >                 > > > > > >
>             >                 > > > > > > > > Qt
>             >                 > > > > > > > > 5.9.
>             >                 > > > > > > > >
>             >                 > > > > > > > > > Also, many parts of the
>             documentation
>             >                 seem to be missing,
>             >                 > >
>             >                 > > very
>             >                 > >
>             >                 > > > > > > > > > light,
>             >                 > > > > > > > > > and
>             >                 > > > > > > > > > not up to the same
>             standard as the
>             >                 rest of Qt's
>             >                 > >
>             >                 > > documentation.
>             >                 > >
>             >                 > > > > > > > > Yes this is something I
>             really want to
>             >                 have a push on in the
>             >                 > >
>             >                 > > near
>             >                 > >
>             >                 > > > > > > future.
>             >                 > > > > > >
>             >                 > > > > > > > > Cheers,
>             >                 > > > > > > > >
>             >                 > > > > > > > > Sean
>             >                 > > > > > > > >
>             >                 > > > > > > > > > Perhaps,
>             >                 > > > > > > > > > I'm just missing
>             something from the
>             >                 undocumented
>             >                 > >
>             >                 > > documentation.
>             >                 > >
>             >                 > > > > > > > > > Thanks,
>             >                 > > > > > > > > > Phi|ip
>             >                 > > > > > > > >
>             >                 > > > > > > > > --
>             >                 > > > > > > > > Dr Sean Harmer |
>             sean.harmer at kdab.com <mailto:sean.harmer at kdab.com>
>             >                 <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>> | Managing Director UK
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>             >                 > > > > > >
>             >                 > > > > > > --
>             >                 > > > > > > Dr Sean Harmer |
>             sean.harmer at kdab.com <mailto:sean.harmer at kdab.com>
>             >                 <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>> | Managing Director UK
>             >                 > > > > > > KDAB (UK) Ltd, a KDAB Group
>             company
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>             >                 > > > > > > KDAB - Qt Experts
>             >                 > > > >
>             >                 > > > > --
>             >                 > > > > Dr Sean Harmer |
>             sean.harmer at kdab.com <mailto:sean.harmer at kdab.com>
>             >                 <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>> | Managing Director UK
>             >                 > > > > KDAB (UK) Ltd, a KDAB Group company
>             >                 > > > > Tel. +44 (0)1625 809908
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>             >                 > >
>             >                 > > --
>             >                 > > Dr Sean Harmer | sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>
>             >                 <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>> | Managing Director UK
>             >                 > > KDAB (UK) Ltd, a KDAB Group company
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>             <mailto:Interest at qt-project.org>
>             <mailto:Interest at qt-project.org
>             <mailto:Interest at qt-project.org>>
>             >                 > >
>             http://lists.qt-project.org/mailman/listinfo/interest
>             >
>             >                 --
>             >                 Dr Sean Harmer | sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>
>             >                 <mailto:sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com>> | Managing Director UK
>             >                 KDAB (UK) Ltd, a KDAB Group company
>             >                 Tel. +44 (0)1625 809908
>             <tel:+44%201625%20809908> <tel:+44%201625%20809908>;
>             >                 Sweden (HQ) +46-563-540090
>             <tel:+46%20563%2054%2000%2090> <tel:+46%20563%2054%2000%2090>
>             >                 Mobile: +44 (0)7545 140604
>             <tel:+44%207545%20140604> <tel:+44%207545%20140604>
>             >                 KDAB - Qt Experts
>             >
>             >
>             >             _______________________________________________
>             >             Interest mailing list
>             >             Interest at qt-project.org
>             <mailto:Interest at qt-project.org>
>             <mailto:Interest at qt-project.org
>             <mailto:Interest at qt-project.org>>
>             >
>              http://lists.qt-project.org/mailman/listinfo/interest
>             >
>             >         --
>             >         Phi|ip
>             >
>             >     --
>             >     Phi|ip
>             >
>             > --
>             > Phi|ip
>             >
>             >
>             > _______________________________________________
>             > Interest mailing list
>             > Interest at qt-project.org <mailto:Interest at qt-project.org>
>             > http://lists.qt-project.org/mailman/listinfo/interest
>             >
>
>             --
>             Dr Sean Harmer | sean.harmer at kdab.com
>             <mailto:sean.harmer at kdab.com> | Managing Director UK
>             KDAB (UK) Ltd, a KDAB Group company
>             Tel. +44 (0)1625 809908 <tel:+44%201625%20809908>; Sweden
>             (HQ) +46-563-540090 <tel:+46%20563%2054%2000%2090>
>             Mobile: +44 (0)7545 140604 <tel:+44%207545%20140604>
>             KDAB - Qt Experts
>             _______________________________________________
>             Interest mailing list
>             Interest at qt-project.org <mailto:Interest at qt-project.org>
>             http://lists.qt-project.org/mailman/listinfo/interest
>
>         --
>         Phi|ip
>
>         _______________________________________________
>         Interest mailing list
>         Interest at qt-project.org <mailto:Interest at qt-project.org>
>         http://lists.qt-project.org/mailman/listinfo/interest
>
>
> --
> Phi|ip
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>

-- 
Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
KDAB (UK) Ltd, a KDAB Group company
Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090
Mobile: +44 (0)7545 140604
KDAB - Qt Experts



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