如果通过 Qt Designer 添加 QOpenGLWidget，则会出现运行时警告

Question

我在主窗口上添加了一个 QOpenGLWidget 对象，这使得控制台有很多消息，例如

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.

我的 .pro 文件是

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 是

<?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>

mainwindow.h和mainwindow.cpp文件是常规的，比如QtCreator生成的。

我尝试添加行 QApplication::setAttribute(Qt::AA_ForceRasterWidgets, false);但是无论有没有这行都会有错误：

#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();
}

然后我删除了ui并手动添加了QOpenGLWidget：

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);
}

在这种情况下，手动添加 QOpenGLWidget 时没有错误。但是没有Qt Designer做表单就不舒服了

您能建议如何摆脱有关 QOpenGLContext 和 QRhiGles2 的错误吗？

我的Qt版本是6.5，VS2019编译器，Windows 10。

Answer 1

考虑添加一个虚拟小部件：

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent) {
    new QOpenGLWidget(this);
    // ...
}