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Forum Update on Monday, May 27th 2025

OpenGL version of Qt makes animated QtQuick2 application excessive cpu load

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  • W Offline
    W Offline
    weiyuemin
    wrote on 10 Apr 2013, 15:37 last edited by
    #1

    Anyone has the same issue with me? Or am I missing something?

    When using OpenGL version of Qt(not ANGLE version), as long as the application has constant animations or particle systems, it used 25% cpu on my machine. (one core)

    Both Windows XP and Windows 7 has this problem.

    tested Qt versions:

    5.1.0 alpha, built with -opengl desktop

    a dev branch checked out at March 23th, built with -opengl desktop

    5.0.2 (downloaded at 2013-03-21-461, from http://download.qt-project.org/snapshots/qt/5.0/5.0.2/ , but it's not there now) opengl version

    A simple animation with 'loops: Animation.Infinite' reproduces the issue.

    When I use ANGLE version of Qt (5.0.1), the simple animation uses cpu 0%.

    I'm building 5.1.0 alpha without the option '-opengl desktop' (i.e. ANGLE version). will post the result hours later.

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    • C Offline
      C Offline
      chrisadams
      wrote on 11 Apr 2013, 05:24 last edited by
      #2

      See https://bugreports.qt-project.org/browse/QTBUG-30015 and https://bugreports.qt-project.org/browse/QTBUG-22261

      What does swaplogger or similar tell you? (I know nothing about windows devel, presumably there are similar tools there).

      Cheers,
      Chris.

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      • W Offline
        W Offline
        weiyuemin
        wrote on 11 Apr 2013, 07:06 last edited by
        #3

        It is duplicated with https://bugreports.qt-project.org/browse/QTBUG-29686

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        10 Apr 2013, 15:37

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