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  1. Qt
  2. QTBUG-91722

QOpenGLWindow has a low frame rate on macOS (40 fps)

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Invalid
    • Affects Version/s: 5.12.3, 5.15.3
    • Fix Version/s: None
    • Component/s: GUI: OpenGL
    • Environment:
    • Platform/s:
      macOS

      Description

      This issue does not happen on Linux or Windows (tested on CentOS7 and Windows 10), only on macOS (tested on Catalina 10.15.7 and Mojave 10.14.5).

       

      Rendering a simple rotating triangle only reach 40 fps on macOS inside a QOpenGLWindow , while it reaches the display refresh rate on Linux and Windows (60 fps). Note that for comparison on macOS, this is not issue inside a QGLWidget or a QOpenGLWidget.

       

      Note that this is visible during the rotation, you can visually perceive that the animation inside a QOpenGLWindow is not as smooth as with QGLWidget or QOpenGLWidget.

       

      The attached source archive (it includes a README.txt) demonstrates the issue with QOpenGLWindow and also provide comparative test programs with QGLWidget and QOpenGLWidget. It is rotating a red triangle on a green background with a fixed pipeline and immediate mode, nothing fancy.

       

        Attachments

        1. big_app_log.txt
          19 kB
        2. qt_bug_qopenglwindow_40fps.tgz
          6 kB
        3. qtbug91722.zip
          22 kB
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            Assignee:
            lagocs Laszlo Agocs
            Reporter:
            fbertelschrodinger François Bertel
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              Dates

              Created:
              Updated:
              Resolved:

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