[Interest] Qt3D - Using external Textures from another OpenGL Context

[Philip Schuchardt]

Sweet! Sounds interesting. I want to play around with combining QtLocation
(QML Map item), DEMs, and Qt3D to do some simple terrain modeling.

On Mon, Dec 5, 2016 at 1:59 PM Sean Harmer <sh at theharmers.co.uk> wrote:

> Hi,
>
> On 05/12/2016 18:54, Philip Schuchardt wrote:
> > I want to render QML to an OpenGL texture through a framebuffer and then
> > share that texture with Qt3D.
>
> there is a working WIP progress implementation of this on gerrit at:
>
>
> https://codereview.qt-project.org/#/q/status:open+project:qt/qt3d+branch:wip/qtquickintegration,n,z
>
>
> > Rendering to a framebuffer is fairly
> > straight forward with a
> > QQuickRenderControl.
>
> Yes. The trickier part is mapping events from 3D space through to the
> QtQuick scene.
>
> > A good example of it is
> > in https://doc.qt.io/qt-5/qtquick-rendercontrol-example.html. Is there
> > any way to share OpenGL textures between an OpenGL context that I
> > control and the OpenGL context that qt3d controls? Also, does qt3d use a
> > sperate OpenGL context than QML scene graph (onscreen)?
>
> It depends :) If you have Qt Quick in charge and are embedding Qt 3D
> into Qt Quick scene using a Scene3D item, then Qt 3D uses the same GL
> context as Qt Quick.
>
> If Qt 3D is in charge it uses it's own context.
>
> With the above series of patches, we use the Qt 3D context to render Qt
> Quick using QQuickRenderControl as you mention.
>
> We're hoping to get this into Qt 5.9 but in the meantime you can
> cherry-pick those changes to give it a test.
>
> Cheers,
>
> Sean
>
> > --
> > Phi|ip
> >
> >
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> >
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-- 
Phi|ip
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