add another btgui test

btgui/OpenGLWindow/OpenGLInclude.h

@@ -0,0 +1,51 @@
+/*
+Copyright (c) 2012 Advanced Micro Devices, Inc.  
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+//Originally written by Erwin Coumans
+
+
+#ifndef __OPENGL_INCLUDE_H
+#define __OPENGL_INCLUDE_H
+
+
+//think different
+#if defined(__APPLE__) && !defined (VMDMESA)
+#include <OpenGL/OpenGL.h>
+//#include <OpenGL/gl.h>
+#include <OpenGL/glu.h>
+//#import <Cocoa/Cocoa.h>
+#include <OpenGL/gl3.h>
+#else
+
+#include <GL/glew.h>
+
+#ifdef _WINDOWS
+#include <windows.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+#else
+#include <GL/gl.h>
+#include <GL/glu.h>
+#endif //_WINDOWS
+#endif //APPLE
+
+
+
+///on Linux only glDrawElementsInstancedARB is defined?!?
+#ifdef __linux
+#define glDrawElementsInstanced glDrawElementsInstancedARB
+
+#endif //__linux
+
+#endif //__OPENGL_INCLUDE_H
+