// -----------------------------------------------------------------------------
// This file is part of Broken Sword 2.5
// Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdörfer
//
// Broken Sword 2.5 is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Broken Sword 2.5 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Broken Sword 2.5; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// -----------------------------------------------------------------------------

#ifndef SWORD25_OPENGLGFX_H
#define SWORD25_OPENGLGFX_H

// -----------------------------------------------------------------------------
// INCLUDES
// -----------------------------------------------------------------------------

#include "sword25/kernel/memlog_off.h"
#include <memory>
#include <vector>
#include "sword25/kernel/memlog_on.h"

#include "sword25/kernel/common.h"
#include "sword25/gfx/graphicengine.h"
#include "sword25/gfx/renderobjectptr.h"
#include "sword25/util/glsprites/glsprites.h"

// -----------------------------------------------------------------------------
// FORWARD DECLARATIONS
// -----------------------------------------------------------------------------

class BS_Kernel;
class BS_Service;
class BS_Resource;
class BS_Panel;
class BS_Image;
class BS_RenderObjectManager;


// -----------------------------------------------------------------------------
// CLASS DECLARATION
// -----------------------------------------------------------------------------

class BS_OpenGLGfx : public BS_GraphicEngine
{
public:
	BS_OpenGLGfx(BS_Kernel* pKernel);
	virtual ~BS_OpenGLGfx();

	// Interface
	// ---------
	virtual bool		Init(int Width, int Height, int BitDepth, int BackbufferCount, bool Windowed);
	virtual bool		StartFrame(bool UpdateAll);
	virtual bool		EndFrame();

	virtual BS_RenderObjectPtr<BS_Panel> GetMainPanel();

	virtual void		SetVsync(bool Vsync);
	virtual bool		GetVsync() const;

	virtual bool		Fill(const BS_Rect* FillRectPtr = 0, unsigned int Color = BS_RGB(0, 0, 0));
	virtual bool		GetScreenshot(unsigned int & Width, unsigned int & Height, std::vector<unsigned int> & Data);

	// Resource-Managing Methoden
	// --------------------------
	virtual BS_Resource*	LoadResource(const std::string& FileName);
	virtual bool			CanLoadResource(const std::string& FileName);

	// Debugging Methoden
	// ------------------
	virtual void DrawDebugLine(const BS_Vertex & Start, const BS_Vertex & End, unsigned int Color);
	static const char * GetGLSResultString(GLS_Result Result);

	// Persistenz Methoden
	// -------------------
	virtual bool Persist(BS_OutputPersistenceBlock & Writer);
	virtual bool Unpersist(BS_InputPersistenceBlock & Reader);

private:
	bool				m_GLspritesInitialized;

	BS_RenderObjectPtr<BS_Panel> m_MainPanelPtr;

	std::auto_ptr<BS_RenderObjectManager>	m_RenderObjectManagerPtr;

	struct DebugLine
	{
		DebugLine(const BS_Vertex & _Start, const BS_Vertex & _End, unsigned int _Color) :
			Start(_Start),
			End(_End),
			Color(_Color) {};
			
		BS_Vertex		Start;
		BS_Vertex		End;
		unsigned int	Color;
	};

	std::vector<DebugLine> m_DebugLines;

	static bool ReadFramebufferContents(unsigned int Width, unsigned int Height, std::vector<unsigned int> & Data);
	static void ReverseRGBAComponentOrder(std::vector<unsigned int> & Data);
	static void FlipImagedataVertical(unsigned int Width, unsigned int Height, std::vector<unsigned int> & Data);
};

#endif