Merged branch 'dev_native' into lm_sla_supports_auto

Added igl library files

src/igl/opengl2/gl.h

@@ -0,0 +1,44 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_OPENGL2_GL_H
+#define IGL_OPENGL2_GL_H
+
+#ifdef IGL_OPENGL_GL_H
+#  error "igl/opengl/gl.h already included"
+#endif
+
+// Always use this:
+//     #include "gl.h"
+// Instead of:
+//     #include <OpenGL/gl.h>
+// or
+//     #include <GL/gl.h>
+//
+
+// For now this includes glu, glew and glext (perhaps these should be
+// separated)
+#ifdef _WIN32
+#    define NOMINMAX
+#    include <Windows.h>
+#    undef DrawText
+#    undef NOMINMAX
+#endif
+
+#ifndef __APPLE__
+#  define GLEW_STATIC
+#  include <GL/glew.h>
+#endif
+
+#ifdef __APPLE__
+#  include <OpenGL/gl.h>
+#  define __gl_h_ /* Prevent inclusion of the old gl.h */
+#else
+#  include <GL/gl.h>
+#endif
+
+#endif