//--------------------------------------------------------------------------- class AUX_RGBImageRec {   void convertBGRtoRGB(); public:   byte *data;   DWORD sizeX;   DWORD sizeY;   bool NoErrors;   AUX_RGBImageRec(): NoErrors(false), data(NULL) {};   AUX_RGBImageRec(const char *FileName);   ~AUX_RGBImageRec();   bool loadFile(const char *FileName);   friend AUX_RGBImageRec *auxDIBImageLoad(const char *FileName);};        

                //--------------------------------------------------------------#include <windows.h>		// Header File For Windows - has structures for BMP format#include <stdio.h>	    	// Header File For Standard Input/Output#include <stdlib.h>#include "BMP.h"/*------------------------------------------------------------------ BMP Loader - a quick and dirty substitute for GLaux if you only use GLaux to load BMP files will load any format of a windows DIB BMP format graphics file Only works on a windows box   Caution! memory for the data is allocated using 'new'.  In the NeHe tutorials the memory is reclaimed using 'free'.   For the small tutorials its not a big deal but not a good practice in larger projects (heap trashing not good). J.M. Doyle : 12 Jan 2003------------------------------------------------------------------*/AUX_RGBImageRec *auxDIBImageLoad(const char *FileName){  return new AUX_RGBImageRec(FileName);}void AUX_RGBImageRec::convertBGRtoRGB(){  const DWORD BitmapLength = sizeX * sizeY * 3;  byte Temp;  // not quick but it works  for(DWORD i=0; i< BitmapLength; i += 3) {    Temp = data[i];    data[i] = data[i+2];    data[i+2] = Temp;    }}AUX_RGBImageRec::AUX_RGBImageRec(const char *FileName): data(NULL), NoErrors(false){  loadFile(FileName);}AUX_RGBImageRec::~AUX_RGBImageRec(){  if (data != NULL) delete [] data;  data = NULL;}bool AUX_RGBImageRec::loadFile(const char* Filename){  BITMAPINFO BMInfo;  // need the current OpenGL device contexts in order to make use of windows DIB utilities  const HDC gldc = wglGetCurrentDC();   // a handle for the current OpenGL Device Contexts  // assume there are errors until file is loaded successfully into memory  NoErrors = false;  // release old data since this object could be used to load multiple Textures  if(data != NULL) delete data;  // windows needs this info to determine what header info we are looking for  BMInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);  // Get windows to determine color bit depth in the file for us  BMInfo.bmiHeader.biBitCount = 0;  // Get windows to open and load the BMP file and handle the messy decompression if the file is compressed  // assume perfect world and no errors in reading file, Ha Ha  HANDLE DIBHandle = LoadImage(0,Filename, IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR | LR_CREATEDIBSECTION | LR_LOADFROMFILE);  // use windows to get header info of bitmap - assume no errors in header format  GetDIBits(gldc, DIBHandle, 0,0, NULL, &BMInfo, DIB_RGB_COLORS);  sizeX = BMInfo.bmiHeader.biWidth;  sizeY = BMInfo.bmiHeader.biHeight;  // change color depth to 24 bits (3 bytes (BGR) / pixel)  BMInfo.bmiHeader.biBitCount = 24;  // don't want the data compressed  BMInfo.bmiHeader.biCompression = BI_RGB;  const DWORD BitmapLength = sizeX * sizeY * 3; // 3 bytes (BGR) per pixel (24bp)  // allocate enough memory to hold the pixel data in client memory  data = new byte[BitmapLength];  // Get windows to do the dirty work of converting the BMP into the format needed by OpenGL  // if file is already 24 bit color then this is a waste of time but makes for short code  // Get the actual Texel data from the BMP object  if (GetDIBits(gldc, DIBHandle, 0, sizeY, data, &BMInfo, DIB_RGB_COLORS)) {    NoErrors = true;    convertBGRtoRGB(); // NOTE: BMP is in BGR format but OpenGL needs RGB unless you use GL_BGR_EXT  }  DeleteObject(DIBHandle);  // don't need the BMP Object anymore  return NoErrors;}