Review Request 128763: WindowThumbnail: Do GL calls in the correct thread

[Martin Gräßlin]

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src/declarativeimports/core/windowthumbnail.cpp (lines 481 - 492)
<https://git.reviewboard.kde.org/r/128763/#comment66521>

    what about these commented lines?


- Martin Gräßlin


On Sept. 1, 2016, 12:50 p.m., David Edmundson wrote:
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> https://git.reviewboard.kde.org/r/128763/
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> (Updated Sept. 1, 2016, 12:50 p.m.)
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> 
> Review request for KDE Frameworks and Plasma.
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> Repository: plasma-framework
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> Description
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> WindowThumbnail did some open GL operations, discarding old textures, in the GUI thread. Whislt it's not going to cause a threading issue (as updatePaintNode always ran when the main thread was blocked) we're not meant to mix threads with openGL contexts.
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> It also seems to have a GL leak on nvidia, which was previously masked
> by the double delete fixed in https://git.reviewboard.kde.org/r/126131/diff/2/
> It seems only one worked, and in the applied version we went with the wrong one.
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> This patch makes use of QQuickItem::releaseResources to delete the GL
> textures on window change and destructor; it's then removed from
> stopRedirecting so that start/stop redirecting handles xcb on the GUI thread and updatePaintNode/discardPixmap is the GL stuff on the render thread. 
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> See http://doc.qt.io/qt-5/qquickitem.html#graphics-resource-handling
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> REVIEW:
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> Diffs
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>   src/declarativeimports/core/windowthumbnail.h 7276f95de16e71006618f3282d8eaf419a199d1d 
>   src/declarativeimports/core/windowthumbnail.cpp d106994315099ab6e6f948c31a606d5309ae03e2 
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> Diff: https://git.reviewboard.kde.org/r/128763/diff/
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> Testing
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> Using nvidia with proprietory drivers (which puts me QSG_RENDER_LOOP=threaded) mouse over the panel a lot. VRAM didn't increase. Previews still appear. 
> "Used Dedicated Memory:" in nvidia-settings remained roughly static, rather than constantly increasing.
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> Thanks,
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> David Edmundson
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