#ifndef ENGINE_CLIENT_GRAPHICS_H
#define ENGINE_CLIENT_GRAPHICS_H

class CGraphics_OpenGL : public IEngineGraphics
{
protected:
	class IStorage *m_pStorage;
	
	//
	typedef struct { float x, y, z; } CPoint;
	typedef struct { float u, v; } CTexCoord;
	typedef struct { float r, g, b, a; } CColor;

	typedef struct
	{
		CPoint m_Pos;
		CTexCoord m_Tex;
		CColor m_Color;
	} CVertex;
	
	enum
	{
		MAX_VERTICES = 32*1024,
		MAX_TEXTURES = 1024*4,
		
		DRAWING_QUADS=1,
		DRAWING_LINES=2		
	};

	CVertex m_aVertices[MAX_VERTICES];
	int m_NumVertices;

	CColor m_aColor[4];
	CTexCoord m_aTexture[4];

	bool m_RenderEnable;

	float m_Rotation;
	int m_Drawing;
	bool m_DoScreenshot;

	float m_ScreenX0;
	float m_ScreenY0;
	float m_ScreenX1;
	float m_ScreenY1;

	int m_InvalidTexture;

	struct CTexture
	{
		GLuint m_Tex;
		int m_MemSize;
		int m_Flags;
		int m_Next;
	};

	CTexture m_aTextures[MAX_TEXTURES];
	int m_FirstFreeTexture;
	int m_TextureMemoryUsage;

	void Flush();
	void AddVertices(int Count);
	void Rotate4(CPoint *pCenter, CVertex *pPoints);
	
	static unsigned char Sample(int w, int h, const unsigned char *pData, int u, int v, int Offset);
public:
	CGraphics_OpenGL();
	
	virtual void ClipEnable(int x, int y, int w, int h);
	virtual void ClipDisable();
		
	virtual void BlendNone();
	virtual void BlendNormal();
	virtual void BlendAdditive();

	virtual int MemoryUsage() const;
		
	virtual void MapScreen(float TopLeftX, float TopLeftY, float BottomRightX, float BottomRightY);
	virtual void GetScreen(float *pTopLeftX, float *pTopLeftY, float *pBottomRightX, float *pBottomRightY);

	virtual void LinesBegin();
	virtual void LinesEnd();
	virtual void LinesDraw(const CLineItem *pArray, int Num);
	
	virtual int UnloadTexture(int Index);
	virtual int LoadTextureRaw(int Width, int Height, int Format, const void *pData, int StoreFormat, int Flags);

	// simple uncompressed RGBA loaders
	virtual int LoadTexture(const char *pFilename, int StoreFormat, int Flags);
	virtual int LoadPNG(CImageInfo *pImg, const char *pFilename);

	void ScreenshotDirect(const char *pFilename);

	virtual void TextureSet(int TextureID);

	virtual void Clear(float r, float g, float b);

	virtual void QuadsBegin();
	virtual void QuadsEnd();
	virtual void QuadsSetRotation(float Angle);

	virtual void SetColorVertex(const CColorVertex *pArray, int Num);
	virtual void SetColor(float r, float g, float b, float a);

	virtual void QuadsSetSubset(float TlU, float TlV, float BrU, float BrV);
	virtual void QuadsSetSubsetFree(
		float x0, float y0, float x1, float y1,
		float x2, float y2, float x3, float y3);

	virtual void QuadsDraw(CQuadItem *pArray, int Num);
	virtual void QuadsDrawTL(const CQuadItem *pArray, int Num);
	virtual void QuadsDrawFreeform(const CFreeformItem *pArray, int Num);
	virtual void QuadsText(float x, float y, float Size, float r, float g, float b, float a, const char *pText);
	
	virtual bool Init();
};

class CGraphics_SDL : public CGraphics_OpenGL
{
	SDL_Surface *m_pScreenSurface;	
	
	int TryInit();
	int InitWindow();
public:
	CGraphics_SDL();

	virtual bool Init();
	virtual void Shutdown();

	virtual void Minimize();
	virtual void Maximize();

	virtual int WindowActive();
	virtual int WindowOpen();

	virtual void TakeScreenshot();
	virtual void Swap();

	virtual int GetVideoModes(CVideoMode *pModes, int MaxModes);
	
};

#endif