源代码研究之CＩＭＡＧＥ；我们可以直接使用来创建纹理。

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biSizeImage=(biWidth*biBitCount+31)/32*4*biHeight 

inline void GetColor( unsigned int x, unsigned  int y, unsigned char* ucpRed, unsigned char* ucpGreen, unsigned char* ucpBlue )//==============================================================//==============================================================//= image.h ====================================================//= Original coders: Trent Polack ([e-mail]) and   =//- Evan Pipho  ([e-mail])   =//==============================================================//= Image/texture loadings ops   =//==============================================================//==============================================================#ifndef __IMAGE_H__#define __IMAGE_H__//--------------------------------------------------------------//--------------------------------------------------------------//- HEADERS AND LIBRARIES --------------------------------------//--------------------------------------------------------------//--------------------------------------------------------------#include <windows.h>#include <gl/gl.h>#include <gl/glu.h>//--------------------------------------------------------------//--------------------------------------------------------------//- CONSTANTS --------------------------------------------------//--------------------------------------------------------------//--------------------------------------------------------------#define BITMAP_ID 0x4D42//--------------------------------------------------------------//--------------------------------------------------------------//- STRUCTURES -------------------------------------------------//--------------------------------------------------------------//--------------------------------------------------------------struct TGAInformationHeader{unsigned char m_ucHeader[6];unsigned int  m_uiBytesPerPixel;unsigned int  m_uiImageSize;unsigned int  m_uiTemp;unsigned int  m_uiType;unsigned int  m_uiHeight;unsigned int  m_uiWidth;unsigned int  m_uiBPP;};//设置1字节对齐，入栈push1#pragma pack( push, 1 )struct BMPFileHeader{unsigned short usType; //2位    unsigned int uiSize; //4位    unsigned short usReserved1;//2位     unsigned short usReserved2; //2位    unsigned int uiOffBits; //4位};//取消1字节对齐，pop 1..出栈#pragma pack( pop )struct BMPInfoHeader{unsigned int  uiSize;     long   lWidth;     long   lHeight;     unsigned short usPlanes;     unsigned short usBitCount;     unsigned int uiCompression;     unsigned int uiSizeImage;     long lXPelsPerMeter;     long lYPelsPerMeter;     unsigned int uiClrUsed;     unsigned int uiClrImportant; };//--------------------------------------------------------------//--------------------------------------------------------------//- GLOBALS ----------------------------------------------------//--------------------------------------------------------------//--------------------------------------------------------------extern unsigned char g_ucUTGAcompare[12];extern unsigned char g_ucCTGAcompare[12];//--------------------------------------------------------------//--------------------------------------------------------------//- CLASS ------------------------------------------------------//--------------------------------------------------------------//--------------------------------------------------------------class CIMAGE{private:unsigned char* m_ucpData;unsigned int   m_uiWidth;unsigned int   m_uiHeight;unsigned int   m_uiBPP;unsigned int   m_ID;bool m_bIsLoaded;bool LoadBMP( void );bool SaveBMP( char* szFilename );bool LoadCompressedTGA( void );bool LoadUncompressedTGA( void );public:bool Create( unsigned int uiWidth, unsigned int uiHeight, unsigned int uiBPP );bool LoadData( char* a_szFilename );bool Load( char* a_szFilename, float a_fMinFilter, float a_fMaxFilter, bool a_bMipmap= false );void Unload( void );bool Save( char* szFilename );//--------------------------------------------------------------// Name:CIMAGE::GetColor - public// Description:Get the color (RGB triplet) from a texture pixel// Arguments:-x, y: position to get color from//-ucpRed, ucpGreen, ucpBlue: place to store the RGB// values that are extracted from the texture// Return Value:None//--------------------------------------------------------------inline void GetColor( unsigned int x, unsigned  int y, unsigned char* ucpRed, unsigned char* ucpGreen, unsigned char* ucpBlue ){unsigned int uiBPP= m_uiBPP/8;if( ( x<m_uiWidth ) && ( y<m_uiHeight ) ){*ucpRed  = m_ucpData[( ( y*m_uiHeight )+x )*uiBPP];*ucpGreen= m_ucpData[( ( y*m_uiHeight )+x )*uiBPP+1];*ucpBlue = m_ucpData[( ( y*m_uiHeight )+x )*uiBPP+2];}}//--------------------------------------------------------------// Name:CIMAGE::SetColor - public// Description:Set the color (RGB triplet) for a texture pixel// Arguments:-x, y: position to set color at//-ucpRed, ucpGreen, ucpBlue: color to set at pixel// Return Value:None//--------------------------------------------------------------inline void SetColor( unsigned int x, unsigned  int y, unsigned char ucRed, unsigned char ucGreen, unsigned char ucBlue ){unsigned int uiBPP= m_uiBPP/8;if( ( x<m_uiWidth ) && ( y<m_uiHeight ) ){m_ucpData[( ( y*m_uiHeight )+x )*uiBPP]  = ucRed;m_ucpData[( ( y*m_uiHeight )+x )*uiBPP+1]= ucGreen;m_ucpData[( ( y*m_uiHeight )+x )*uiBPP+2]= ucBlue;}}//--------------------------------------------------------------// Name:CIMAGE::GetData - public// Description:Get a pointer to the image's data buffer// Arguments:None// Return Value:An unsigned char buffer (the texture's data)//--------------------------------------------------------------inline unsigned char* GetData( void ){return m_ucpData;}//--------------------------------------------------------------// Name:CIMAGE::GetWidth - public// Description:Get the texture's width (size along the x-axis)// Arguments:None// Return Value:An unsigned int value: the texture's size along the x-axis//--------------------------------------------------------------inline unsigned int GetWidth( void ){return m_uiWidth;}//--------------------------------------------------------------// Name:CIMAGE::GetHeight - public// Description:Get the texture's height (size along the y-axis)// Arguments:None// Return Value:An unsigned int value: the texture's size along the y-axis//--------------------------------------------------------------inline unsigned int GetHeight( void ){return m_uiHeight;}//--------------------------------------------------------------// Name:CIMAGE::GetBPP - public// Description:Get the texture's number of bits per pixel// Arguments:None// Return Value:An unsigned int value: the texture's bits per pixel//--------------------------------------------------------------inline unsigned int GetBPP( void ){return m_uiBPP;}//--------------------------------------------------------------// Name:CIMAGE::GetID - public// Description:Get the texture's identifying ID (use with OpenGL)// Arguments:None// Return Value:An unsigned int value: the texture's ID//--------------------------------------------------------------inline unsigned int GetID( void ){return m_ID;}//--------------------------------------------------------------// Name:CIMAGE::SetID - public// Description:Set the texture's identifying ID (use with OpenGL)// Arguments:-uiID: the texture's soon-to-be ID// Return Value:None//--------------------------------------------------------------inline void SetID( unsigned int uiID ){m_ID= uiID;}//--------------------------------------------------------------// Name:CIMAGE::IsLoaded - public// Description:Find out if the texture has been loaded or not// Arguments:None// Return Value:A boolean value: -true: a texture has been loaded// -false: a texture hasn't been loaded//--------------------------------------------------------------inline bool IsLoaded( void ){return m_bIsLoaded;}};#endif//__IMAGE_H__

 //首先，我们关心的是它的接口：

 

 

inline bool IsLoaded( void )

 

inline void SetID( unsigned int uiID )

 

inline unsigned int GetID( void )

 

inline unsigned int GetBPP( void )

 

 inline unsigned int GetHeight( void )

 

 inline unsigned int GetWidth( void )

 

 inline unsigned char* GetData( void )

 

inline void SetColor( unsigned int x, unsigned  int y, unsigned char ucRed, unsigned char ucGreen, unsigned char ucBlue )

 

 inline void GetColor( unsigned int x, unsigned  int y, unsigned char* ucpRed, unsigned char* ucpGreen, unsigned char* ucpBlue )

 

 

 

 

 

就这么多。。。。。。。

 

它对应于一个文件。。

 

 

前面n多是GetSet方法。。。。关键是如何实现的Load和LoadData；；

 

 

//创建一个新的BMP（在内存中的）『实际上是个二维数组。。。』

 bool Create( unsigned int uiWidth, unsigned int uiHeight, unsigned int uiBPP );

//这个函数用指定的filename来保存此对象中的数据。

 bool Save( char* szFilename );

//卸载Load进来的数据。

 

 void Unload( void );

 

 //这个函数用来加载BMP文件并且制作纹理，纹理ID可以通过

 // inline unsigned int GetID( void ) 得到

//如果用这个函数，那么纹理ID已经设好。。。。。。。。。。。。一定不能再去SetID

 bool Load( char* a_szFilename, float a_fMinFilter, float a_fMaxFilter, bool a_bMipmap= false );

 //纯粹的把BMP内容加载进来

 

//下面这个函数没有纹理ID，因此，必须手动设置纹理ID。

 

 bool LoadData( char* a_szFilename );