#ifndef _GM_OPENGL_#define _GM_OPENGL_#include 
     
              // Header File For Windows#include 
      
                 // Header File For The OpenGL32 Library#include 
       
                 // Header File For The GLu32 Librar#include 
        
                // Header File For The GLAUX Librar#pragma comment(lib,"OpenGL32.lib")#pragma comment(lib,"GLu32.lib")#pragma comment(lib,"GLAUX.lib")#endif#ifdef glDG#include 
         
          #include 
          
           void ErrorExit() { // Retrieve the system error message for the last-error code LPVOID lpMsgBuf; LPVOID lpDisplayBuf; DWORD dw = GetLastError(); FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf, 0, NULL ); // Display the error message and exit the process lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, (lstrlen((LPCTSTR)lpMsgBuf) + lstrlen((LPCTSTR)"fun") + 40) * sizeof(TCHAR)); StringCchPrintf((LPTSTR)lpDisplayBuf, LocalSize(lpDisplayBuf) / sizeof(TCHAR), TEXT("%s failed with error %d: %s"), "fun", dw, lpMsgBuf); MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK); LocalFree(lpMsgBuf); LocalFree(lpDisplayBuf); ExitProcess(dw); }#endif