//

// "$Id: gl.h 10872 2015-10-21 14:37:27Z manolo $"

//

// 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. Distribution and use rights are outlined in

// the file "COPYING" which should have been included with this file.  If this

// file is missing or damaged, see the license at:

//

//     http://www.fltk.org/COPYING.php

//

// 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  // __APPLE__

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 10872 2015-10-21 14:37:27Z manolo $".

//