qt5base-lts/examples/opengl/threadedqopenglwidget/glwidget.h

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#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QOpenGLWidget>

QT_FORWARD_DECLARE_CLASS(QThread)

class Renderer;

class GLWidget : public QOpenGLWidget
{
    Q_OBJECT
public:
    explicit GLWidget(QWidget *parent = nullptr);
    ~GLWidget();

protected:
    void paintEvent(QPaintEvent *) override { }

signals:
    void renderRequested();

public slots:
    void grabContext();

private slots:
    void onAboutToCompose();
    void onFrameSwapped();
    void onAboutToResize();
    void onResized();

private:
    QThread *m_thread;
    Renderer *m_renderer;
};

#endif // GLWIDGET_H