#ifndef TOFFLINEGL_INCLUDED
#define TOFFLINEGL_INCLUDED

#include <memory>

#include "tgl.h"

#undef DVAPI
#undef DVVAR

#ifdef TVRENDER_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

class TVectorRenderData;
class TVectorImageP;
class TRasterImageP;

//------------------------------------------------------

class DVAPI TGLContextManager
{
public:
	virtual void store() = 0;
	virtual void restore() = 0;
};

//------------------------------------------------------

class DVAPI TOfflineGL
{

public:
	class Imp
	{
	protected:
		int m_lx, m_ly;

	public:
		Imp(int lx, int ly) : m_lx(lx), m_ly(ly) {}
		virtual ~Imp(){};
		virtual void makeCurrent() = 0;
		virtual void doneCurrent() = 0; // Da implementare in Imp
		virtual void createContext(TDimension rasterSize, std::shared_ptr<Imp> shared) = 0;
		virtual void getRaster(TRaster32P) = 0;
		virtual int getLx() const { return m_lx; }
		virtual int getLy() const { return m_ly; }
	};
	typedef std::shared_ptr<Imp> ImpGenerator(const TDimension &dim, std::shared_ptr<Imp> shared);
	static ImpGenerator *defineImpGenerator(ImpGenerator *impGenerator);

	TOfflineGL(TDimension dim, const TOfflineGL *shared = 0);
	TOfflineGL(const TRaster32P &raster, const TOfflineGL *shared = 0);

	~TOfflineGL();

	void makeCurrent();
	void doneCurrent();

	static void setContextManager(TGLContextManager *contextManager);

	void initMatrix();

	void clear(TPixel32 color);

	void draw(TVectorImageP image, const TVectorRenderData &rd, bool doInitMatrix = false);

	void draw(TRasterImageP image, const TAffine &aff, bool doInitMatrix = false);

	void flush();

	TRaster32P getRaster(); // Ritorna il raster copiandolo dal buffer offline
	void getRaster(TRaster32P raster);
	void getRaster(TRasterP raster);

	int getLx() const;
	int getLy() const;
	TDimension getSize() const { return TDimension(getLx(), getLy()); };
	TRect getBounds() const { return TRect(0, 0, getLx() - 1, getLy() - 1); };

	static TOfflineGL *getStock(TDimension dim);
	// si usa cosi': TOfflineGL *ogl = TOfflineGL::getStock(d);
	// non bisogna liberare ogl
	std::shared_ptr<Imp> m_imp;

private:
private:
	// not implemented
	TOfflineGL(const TOfflineGL &);
	TOfflineGL &operator=(const TOfflineGL &);
};

#endif