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  1. Qt
  2. QTBUG-46634

QOpenGLWidget causes flicker when resizing parent window

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 5.4.2, 5.5.0, 5.9.0 Beta 1, 5.9.7, 5.9.8, 5.13.0, 6.4.2
    • GUI: OpenGL, Widgets: Main Window
    • Windows 8.1 x64 Pro
      Qt 5.4.2 built with VS2013 x64
      CPU: Intel core i5 3570
      Graphics: the one integrated with the processor
      RAM: 16 GB

      Putting a QOpenGLWidget inside a QMainWindow as a child causes really noticeable and annoying flicker when re-sizing the QMainWindow through the handles at the borders/corners.

      I thought I was missing something in my program, so I just tried out the included "2D Painting on Native and OpenGL Widgets" which comes with Qt, but the problem is there too.
      If you comment out lines 55, 63 and 70 of "window.cpp" in that example, the flicker completely disappears.

        1. IMG_0311.jpg
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        2. IMG_0336.jpg
          IMG_0336.jpg
          289 kB
        3. main.cpp
          0.5 kB
        4. native.avi
          7.91 MB
        5. open_GL.avi
          7.17 MB
        6. qopenglwidget.mov
          7.36 MB
        7. qtdiag.txt
          4 kB
        8. qtquickdesigner.mp4
          1.90 MB
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            lagocs Laszlo Agocs
            jubba Claudio Barutta
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              Created:
              Updated:

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