gl.h

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//
// OpenGL header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 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:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

#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__ // PORTME: OpenGL path abstraction
#    include <OpenGL/gl.h>
#  else
#    include <GL/gl.h>
#  endif  // __APPLE__ // PORTME: OpenGL Path abstraction

FL_EXPORT void gl_start();
FL_EXPORT void gl_finish();

FL_EXPORT void gl_color(Fl_Color i);
inline void gl_color(int c) {gl_color((Fl_Color)c);}

FL_EXPORT void 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);
FL_EXPORT void gl_texture_pile_height(int max);
FL_EXPORT int  gl_texture_pile_height();

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