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  1. Qt
  2. QTBUG-83823

Unstable VSYNC in 'requestAnimationFrame' API based tester

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Details

    • Bug
    • Resolution: Fixed
    • P2: Important
    • 5.15.0
    • 5.12, 5.13, 5.14
    • WebEngine
    • None
    • Linux/X11, Windows

    Description

      All sorts of extreme fluctuations are observed with vsynctester in webengine (minimal/simplebrowser,quickbrowser). Chromium 81 performs fine. Situation improved significantly since 5.12, and 5.15 only shows rare peaks, although quite regular. This makes window.requestAnimationFrame API a bit unreliable in js code.

      Attachments

        1. vsync-chr-81.png
          vsync-chr-81.png
          1.01 MB
        2. vsync-5.15-gl.png
          vsync-5.15-gl.png
          686 kB
        3. vsync-5.15-angle.png
          vsync-5.15-angle.png
          1.09 MB
        4. vsync-5.14-gl.png
          vsync-5.14-gl.png
          1.03 MB
        5. vsync-5.14-angle.png
          vsync-5.14-angle.png
          1.04 MB
        6. vsync-5.13-gl.png
          vsync-5.13-gl.png
          1.13 MB
        7. vsync-5.13-angle.png
          vsync-5.13-angle.png
          397 kB

        Issue Links

          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-74991 Trouble hitting 60fps on windows

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Activity

            People

              qt_webengine_team Qt WebEngine Team
              kiburtse Kirill Burtsev
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              Dates

                Created:
                Updated:
                Resolved: