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Thread: Some tearing on QML animations

  1. #1
    Join Date
    Dec 2015
    Qt products
    Qt5 Qt/Embedded

    Default Some tearing on QML animations

    I am noticing some tearing with some QML 2 animations with Qt 5.4.2 on my Tegra 3 based embedded Linux board. I doubt if this is a complete vsync issue because most of the animations are smooth but there are some animations that involve a lot of parallel motion and clipping that tear consistently. These animation come out torn as opposed to simply stuttering so I don't think it is completely a performance issue either. Though it might be caused by the system not being able to put out the necessary FPS to sync properly? The exact same application has no such trouble on my Haswell i7 PC.

    I have enabled QT_QPA_EGLFS_FORCEVSYNC to no effect and have not yet managed to find anything else that I can try. I should mention though that I am running EGLFS with an X11 backend ( as a result of the Nvidia drivers dictating the use of X11. I would assume that this means that I can't really use the FB related settings normally available with EGLFS. Is there anything else that I can try to fix this?

    PS. By setting QT_QPA_EGLFS_SWAPINTERVAL to 0 I can get the tearing to become a whole lot worse. This again suggests that I most likely do not have a whole system vsync issue.

    PPS. I am getting a "QSGContext::initialize: stencil buffer support missing, expect rendering errors" warning at the start of my application.
    Last edited by Gerharddc; 16th December 2015 at 05:39.

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