如何用OpenGL渲染成一个QMainWindow的两个QWidget？

#include <QtWidgets>
#include <QOpenGLWidget>

class GLWidget : public QOpenGLWidget {
public:
    GLWidget(QWidget *parent = nullptr) : QOpenGLWidget(parent) {}

protected:
    void paintEvent(QPaintEvent *event) override {
        // 使用OpenGL进行渲染
        // ...
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QMainWindow mainWindow;
    mainWindow.setWindowTitle("OpenGL Rendering");

    GLWidget *widget1 = new GLWidget(&mainWindow);
    GLWidget *widget2 = new GLWidget(&mainWindow);

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(widget1);
    layout->addWidget(widget2);

    QWidget *centralWidget = new QWidget(&mainWindow);
    centralWidget->setLayout(layout);
    mainWindow.setCentralWidget(centralWidget);

    mainWindow.show();

    return app.exec();
}