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Achieving PostScript and Wmf outputs for OpenGL

, 9 Jun 2003
This article explains how to generate resolution independent versions of 3D meshes rendered by OpenGL/MFC programs, i.e. how to export the rendering results to vectorial formats such as encapsulated postscript (EPS) and Windows enhanced metafile (EMF) formats. The main goal consists of being able to
//********************************************
// Texture.h
//********************************************
// class CTexture
//********************************************
// This object stores a bitmap image used as
// an OpenGL texture.
// Files are stored as .bmp or .jpg format. 
// Depth are currently 24 or 32 bits,
// Modes are : RGB, RGBA (alpha layer).
//********************************************
// alliez@usc.edu
// Created : 17/12/97
// Modified : 18/02/98
//********************************************

#ifndef _TEXTURE_
#define _TEXTURE_

class CTexture : public CObject
{

// Members datas
private :

	unsigned char *m_pData;    // datas
	unsigned int   m_Width;    // width (pixels)
	unsigned int   m_Height;   // height (pixels)
	unsigned int   m_Depth;    // bits per pixel 
	CString        m_FileName; // texture image file name

	BITMAPINFOHEADER m_Header;      // image header (display on device context)
	unsigned int     m_WidthByte32; // width (in bytes, and 32 bits aligned)

public :

	// Construction / destruction
	CTexture();
	virtual ~CTexture();

	// File reading
	int ReadFile(char *filename,unsigned int width=-1,
		           unsigned int height=-1,unsigned int depth=-1);
	int ReadFileBMP(char *filename);
	int ReadFileRAW(char *filename,unsigned int width,
		              unsigned int height,unsigned int depth);
	
	// File saving
	int SaveFile(char *filename);
	int SaveFileBMP(char *filename);
	int SaveFileRAW(char *filename);
	
	// Datas (explicit inline functions)
	unsigned char *GetData(void) { return m_pData; }
	unsigned int GetWidth(void)  { return m_Width; }
	unsigned int GetHeight(void) { return m_Height;}
	unsigned int GetDepth(void)  { return m_Depth; }
	CString GetFileName(void)    { return m_FileName; }

	// Misc
	int IsValid();
	int SameSize(CTexture *pTexture);
	int BGRtoRGB(void);
	static int HigherPowerOfTwo(int value);
	static int LowerPowerOfTwo(int value);

	// Updating
	void UpdateWidthByte32();
	void UpdateHeader();
	unsigned int WidthByte32(unsigned int width,unsigned int depth);

	// Clipboard
	HANDLE ExportHandle();

	// Alpha
	int HasAlpha() { return (m_Depth == 32); }
	int AddAlphaLayer(unsigned char alpha);
	int SetAlphaLayer(unsigned char alpha);
	int PutAlpha(CTexture *pTexture);	// Put an alpha layer from grey scale

	// DuplicateMirror
	int DuplicateMirror(int left=0,int top=0,int right=-1,int bottom=-1);
	int DuplicateRepeatWidth(int left=0,int top=0,int right=-1,int bottom=-1);
	int Extract(int left=0,int top=0,int right=-1,int bottom=-1);

	// Display
	int Draw(CDC *pDC,int xOffset=0,int yOffset=0, int width=-1, int height=-1);

	// Buffer
	int ReadBuffer(unsigned char *buffer, int width, int height, int depth);
	int ReadBuffer(float *buffer, int width, int height, int depth);
	int Grey(unsigned int x,unsigned int y);
	void Color(unsigned int x,unsigned int y,
		unsigned char *pRed,unsigned char *pGreen,unsigned char *pBlue);

private :

	// Memory
	int Alloc(unsigned int width,unsigned int height,unsigned int depth);
	void Free(void);

};

#endif // _TEXTURE_

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About the Author

Pierre Alliez

France France
No Biography provided

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