#include <QOpenGLExtraFunctions>
#include <QWindow>

class QPainter;
class QOpenGLContext;
class QOpenGLPaintDevice;


class OpenGLWindow
	: public QWindow
	, public QOpenGLExtraFunctions {
	Q_OBJECT

public:
	explicit OpenGLWindow(QWindow * parent = nullptr);
	virtual ~OpenGLWindow() {}

	virtual void render() {}
	virtual void initialize() {}

	QOpenGLContext * context() { return m_context; }
	void setVSync(bool on);
	bool getVSync() const;
	//	void setSamples(int samples);
	//	int getSamples() const;
	int getFrameCounter() const { return frame_cnt; }

public slots:
	void renderLater();
	void renderNow();

protected:
	bool event(QEvent * event) override;
	void exposeEvent(QExposeEvent * event) override;

private:
	QOpenGLContext * m_context = nullptr;
	bool format_change         = false;
	int frame_cnt              = 0;
};