glwindow.h

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#ifndef GLWINDOW_H
#define GLWINDOW_H

#include <QWindow>

class GLWindow : public QWindow, protected QOpenGLFunctions
{
    Q_OBJECT

public:
    explicit GLWindow(QWindow *parent = nullptr);
    ~GLWindow();

    QWidget* createWindowContainer(QWidget* parent = nullptr, Qt::WindowFlags flags = nullptr);

    bool isAnimating() const { return m_animating; }

    QSurfaceFormat format() const override { return m_context ? m_context->format() : requestedFormat(); }

signals:
    void initializeFailed(const QString& error);

public slots:
    void setAnimating(bool animating) { m_animating = animating; if(animating) renderLater(); }

    void renderLater();
    void renderNow();

protected:
    bool m_error;

    bool event(QEvent *event) override;
    //the window draws when exposed
    void exposeEvent(QExposeEvent *event) override;

    virtual bool initialize();

    virtual void render();

    QOpenGLContext* m_context;

private:
    bool m_update_pending,m_animating,m_initializing;
    
};

#endif // GLWINDOW_H