A runtime warning if QOpenGLWidget is added via Qt Designer

Question

I have added a QOpenGLWidget object on the main window and this makes the console have a lot of messages such as

QOpenGLContext::makeCurrent() called with non-opengl surface 0x2623b7b7460
QRhiGles2: Failed to make context current. Expect bad things to happen.
QOpenGLContext::makeCurrent() called with non-opengl surface 0x2623dab3450
QRhiGles2: Failed to make context current. Expect bad things to happen.
QOpenGLContext::makeCurrent() called with non-opengl surface 0x2623b7b7460
QRhiGles2: Failed to make context current. Expect bad things to happen.

My .pro file is

QT       += core gui openglwidgets

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

mainwindow.ui is

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <widget class="QOpenGLWidget" name="openGLWidget"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>17</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

The mainwindow.h and mainwindow.cpp files are regular, such as QtCreator generated them.

I have tried adding the line QApplication::setAttribute(Qt::AA_ForceRasterWidgets, false); but there are errors both with and without this line:

#include "mainwindow.h"

#include <QApplication>


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QApplication::setAttribute(Qt::AA_ForceRasterWidgets, false);

    MainWindow w;
    w.show();

    return a.exec();
}

Then I deleted the ui and added the QOpenGLWidget manually:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QWidget *centralWidget = new QWidget(this);
    this->setCentralWidget( centralWidget );
    QGridLayout * gridLayout = new QGridLayout( centralWidget );

    QOpenGLWidget* ow = new QOpenGLWidget(this);
    gridLayout->addWidget(ow);
}

There were no errors in this case, when QOpenGLWidget was added manually. But it is not comfortable to make a form without Qt Designer.

Can you advise how to get out of the errors about QOpenGLContext and QRhiGles2?

My version of Qt is 6.5, VS2019 compiler, Windows 10.

A runtime warning if QOpenGLWidget is added via Qt Designer

0 Answers0