Initial revision

diff --git a/src/SVTK/SVTK_Extension.cxx b/src/SVTK/SVTK_Extension.cxx
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+++ b/src/SVTK/SVTK_Extension.cxx
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+//  SALOME VTKViewer : build VTK viewer into Salome desktop
+//
+//  Copyright (C) 2004  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
+// 
+//  This library is free software; you can redistribute it and/or 
+//  modify it under the terms of the GNU Lesser General Public 
+//  License as published by the Free Software Foundation; either 
+//  version 2.1 of the License. 
+// 
+//  This library is distributed in the hope that it will be useful, 
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of 
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
+//  Lesser General Public License for more details. 
+// 
+//  You should have received a copy of the GNU Lesser General Public 
+//  License along with this library; if not, write to the Free Software 
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
+// 
+//  See http://www.salome-platform.org or email : webmaster.salome@opencascade.org 
+//
+//
+//
+//  File   : SVTK_Extension.cxx
+//  Author : Sergey ANIKIN
+//  Module : SALOME
+
+#include "SVTK_Extension.h"
+
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+void* SVTK::getOpenGLExtension( const char* theExtension )
+{
+#ifdef WIN32
+  return wglGetProcAddress( theExtension );
+#else
+  void* OpenGLLibrary = dlopen( "libGL.so", RTLD_LAZY );
+  return dlsym( OpenGLLibrary, theExtension );
+#endif
+}

diff --git a/src/SVTK/SVTK_Extension.h b/src/SVTK/SVTK_Extension.h
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+// Copyright (C) 2005  OPEN CASCADE, CEA/DEN, EDF R&D, PRINCIPIA R&D
+// 
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either 
+// version 2.1 of the License.
+// 
+// This library is distributed in the hope that it will be useful 
+// but WITHOUT ANY WARRANTY; without even the implied warranty of 
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public  
+// License along with this library; if not, write to the Free Software 
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/
+//
+#ifndef SVTK_Extension_H
+#define SVTK_Extension_H
+
+/*!
+  \file SVTK_Extension.h
+  Functions of loading OpenGL extensions.
+*/
+
+#include <SVTK.h>
+
+namespace SVTK
+{
+  SVTK_EXPORT void* getOpenGLExtension( const char* theExtension );
+}
+
+
+#endif