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  1. Qt
  2. QTBUG-86335

REG: QQuickWidget does not work

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P1: Critical P1: Critical
    • 6.0.0 Beta1
    • 6.0.0 Alpha
    • Qt RHI, Quick: Widget
    • None
    • All
    • bb263b057df71144428fd1981eba7e505bf22b89 (qt/qtdeclarative/dev)

      QQuickWidget no longer works in Qt 6. This was ported to RHI at some point (as long as OpenGL was selected as the backend), but has since then regressed.

      I tested with the following code on Linux and Windows (QSG_RHI_BACKEND=opengl), and the content is not displayed on either.

      main.qml (added to resources):

      import QtQuick 2.12
import QtQuick.Window 2.12

Text {
    visible: true
    width: 640
    height: 480
    text: "foobar"
}

      and

      main.cpp:

      #include <QtGui>
#include <QtWidgets>
#include <QtQuickWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QQuickWidget qw(QUrl{"qrc:/main.qml"});
    qw.show();
    return app.exec();
}

      On Linux, the window is completely black and on Windows, the window is completely black. On both platforms, the following error is displayed on the console:

      virtual void QPlatformBackingStore::composeAndFlush(QWindow*, const QRegion&, const QPoint&, QPlatformTextureList*, bool) no opengl support set

        For Gerrit Dashboard: QTBUG-86335
        # Subject Branch Project Status CR V
        312091,2 Revive QQuickWidget rendering dev qt/qtdeclarative Status: MERGED +2 0

            lagocs Laszlo Agocs
            esabraha Eskil Abrahamsen Blomfeldt
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes