OpenSceneGraph/include/osg/GL

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#ifndef OSG_GL
#define OSG_GL 1
#ifndef WIN32
// non windows, doesn't require nonsense as seen below :-)
#ifndef __gl_h_
#include <GL/gl.h>
#endif
// required for compatibility with glext.h sytle function definitions of
// OpenGL extensions, such as in src/osg/Point.cpp.
#ifndef APIENTRY
#define APIENTRY
#endif
#else
// Under windows avoid including <windows.h>
// to avoid name space pollution, but Win32's <GL/gl.h>
// needs APIENTRY and WINGDIAPI defined properly.
// F
# if 0
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# else
// XXX This is from Win32's <windef.h>
# ifndef APIENTRY
# define GLUT_APIENTRY_DEFINED
# if (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED)
# define APIENTRY __stdcall
# else
# define APIENTRY
# endif
# endif
// XXX This is from Win32's <winnt.h>
# ifndef CALLBACK
# if (defined(_M_MRX000) || defined(_M_IX86) || defined(_M_ALPHA) || defined(_M_PPC)) && !defined(MIDL_PASS)
# define CALLBACK __stdcall
# else
# define CALLBACK
# endif
# endif
// XXX This is from Win32's <wingdi.h> and <winnt.h>
# ifndef WINGDIAPI
# define GLUT_WINGDIAPI_DEFINED
# define WINGDIAPI __declspec(dllimport)
# endif
// XXX This is from Win32's <ctype.h>
# ifndef _WCHAR_T_DEFINED
typedef unsigned short wchar_t;
# define _WCHAR_T_DEFINED
# endif
# endif
#ifndef __gl_h_
#include <GL/gl.h>
#endif
#endif
#endif // __osgGL_h