Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-83823

Unstable VSYNC in 'requestAnimationFrame' API based tester

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Fixed
    • Affects Version/s: 5.12, 5.13, 5.14
    • Fix Version/s: 5.15.0
    • Component/s: WebEngine
    • Labels:
      None
    • Platform/s:
      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-5.13-angle.png
          vsync-5.13-angle.png
          397 kB
        2. vsync-5.13-gl.png
          vsync-5.13-gl.png
          1.13 MB
        3. vsync-5.14-angle.png
          vsync-5.14-angle.png
          1.04 MB
        4. vsync-5.14-gl.png
          vsync-5.14-gl.png
          1.03 MB
        5. vsync-5.15-angle.png
          vsync-5.15-angle.png
          1.09 MB
        6. vsync-5.15-gl.png
          vsync-5.15-gl.png
          686 kB
        7. vsync-chr-81.png
          vsync-chr-81.png
          1.01 MB

          Issue Links

          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            Activity

              People

              Assignee:
              qt_webengine_team Qt WebEngine Team
              Reporter:
              kiburtse Kirill Burtsev
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

                  Gerrit Reviews

                  There are no open Gerrit changes