Include a stripped-down version of FLTK in tree and add a USE_INCLUDED_FLTK option to build against it.
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4603 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/fltk/FL/gl.h b/common/fltk/FL/gl.h
new file mode 100644
index 0000000..ecf37a4
--- /dev/null
+++ b/common/fltk/FL/gl.h
@@ -0,0 +1,112 @@
+//
+// "$Id: gl.h 8623 2011-04-24 17:09:41Z AlbrechtS $"
+//
+// OpenGL header file for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2011 by Bill Spitzak and others.
+//
+// You must include this instead of GL/gl.h to get the Microsoft
+// APIENTRY stuff included (from <windows.h>) prior to the OpenGL
+// header files.
+//
+// This file also provides "missing" OpenGL functions, and
+// gl_start() and gl_finish() to allow OpenGL to be used in any window
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library 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.
+//
+// Please report all bugs and problems on the following page:
+//
+// http://www.fltk.org/str.php
+//
+
+/** \file gl.h
+ * This file defines wrapper functions for OpenGL in FLTK
+ *
+ * To use OpenGL from within an FLTK application you MUST use gl_visual()
+ * to select the default visual before doing show() on any windows. Mesa
+ * will crash if yoy try to use a visual not returned by glxChooseVidual.
+ *
+ * This does not work with Fl_Double_Window's! It will try to draw
+ * into the front buffer. Depending on the system this will either
+ * crash or do nothing (when pixmaps are being used as back buffer
+ * and GL is being done by hardware), work correctly (when GL is done
+ * with software, such as Mesa), or draw into the front buffer and
+ * be erased when the buffers are swapped (when double buffer hardware
+ * is being used)
+ */
+
+#ifndef FL_gl_H
+# define FL_gl_H
+
+# include "Enumerations.H" // for color names
+# ifdef WIN32
+# include <windows.h>
+# endif
+# ifndef APIENTRY
+# if defined(__CYGWIN__)
+# define APIENTRY __attribute__ ((__stdcall__))
+# else
+# define APIENTRY
+# endif
+# endif
+
+# ifdef __APPLE__
+# include <OpenGL/gl.h>
+# else
+# include <GL/gl.h>
+# endif
+
+FL_EXPORT void gl_start();
+FL_EXPORT void gl_finish();
+
+FL_EXPORT void gl_color(Fl_Color i);
+/** back compatibility */
+inline void gl_color(int c) {gl_color((Fl_Color)c);}
+
+FL_EXPORT void gl_rect(int x,int y,int w,int h);
+/**
+ Fills the given rectangle with the current color.
+ \see gl_rect(int x, int y, int w, int h)
+ */
+inline void gl_rectf(int x,int y,int w,int h) {glRecti(x,y,x+w,y+h);}
+
+FL_EXPORT void gl_font(int fontid, int size);
+FL_EXPORT int gl_height();
+FL_EXPORT int gl_descent();
+FL_EXPORT double gl_width(const char *);
+FL_EXPORT double gl_width(const char *, int n);
+FL_EXPORT double gl_width(uchar);
+
+FL_EXPORT void gl_draw(const char*);
+FL_EXPORT void gl_draw(const char*, int n);
+FL_EXPORT void gl_draw(const char*, int x, int y);
+FL_EXPORT void gl_draw(const char*, float x, float y);
+FL_EXPORT void gl_draw(const char*, int n, int x, int y);
+FL_EXPORT void gl_draw(const char*, int n, float x, float y);
+FL_EXPORT void gl_draw(const char*, int x, int y, int w, int h, Fl_Align);
+FL_EXPORT void gl_measure(const char*, int& x, int& y);
+#ifdef __APPLE__
+extern FL_EXPORT void gl_texture_pile_height(int max);
+extern FL_EXPORT int gl_texture_pile_height();
+#endif
+
+FL_EXPORT void gl_draw_image(const uchar *, int x,int y,int w,int h, int d=3, int ld=0);
+
+#endif // !FL_gl_H
+
+//
+// End of "$Id: gl.h 8623 2011-04-24 17:09:41Z AlbrechtS $".
+//