#include <QWindow>
#include <QOpenGLExtraFunctions>

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;
};