//
// "$Id$"
//
// Definition of classes  Fl_Graphics_Driver, Fl_Surface_Device, Fl_Display_Device
// for the Fast Light Tool Kit (FLTK).
//
// Copyright 2016 by Bill Spitzak and others.
//
// 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
//

#ifndef Fl_Gl_Window_Driver_H
#define Fl_Gl_Window_Driver_H

#if defined(FL_PORTING)
# pragma message "FL_PORTING: please, derive and implement the Fl_Gl_Window_Driver class for your platform"
#endif

#include <FL/Fl_Gl_Window.H>

class Fl_Gl_Choice;
class Fl_Font_Descriptor;

/* The constructor of each Fl_Gl_Window object creates also an object from a
 platform-specific derived class from this class.
 */
class Fl_Gl_Window_Driver {
protected:
  Fl_Gl_Window *pWindow;
public:
  Fl_Gl_Choice* g() {return pWindow->g;}
  void g(Fl_Gl_Choice *c) {pWindow->g = c;}
  int mode() {return pWindow->mode_;}
  void mode(int m) { pWindow->mode_ = m;}
  const int *alist() {return pWindow->alist;}
  void alist(const int *l) { pWindow->alist = l;}
  void* overlay() {return pWindow->overlay;}
  void draw_overlay() {pWindow->draw_overlay();}
  
  Fl_Gl_Window_Driver(Fl_Gl_Window *win) : pWindow(win) {}
  virtual ~Fl_Gl_Window_Driver() {}
  static Fl_Gl_Window_Driver *newGlWindowDriver(Fl_Gl_Window *w);
  static Fl_Gl_Window_Driver *global();
  virtual float pixels_per_unit() {return 1;}
  virtual void before_show(int& need_redraw) {}
  virtual void after_show(int need_redraw) {}
  virtual void invalidate();
  virtual int mode_(int m, const int *a) {return 0;}
  virtual void make_current_before() {}
  virtual void make_current_after() {}
  virtual void swap_buffers() {}
  virtual void resize(int is_a_resize, int w, int h) {}
  virtual char swap_type();
  virtual void flush_context() {}
  virtual int flush_begin(char& valid_f) {return 0;}
  virtual void hide_overlay(void *& overlay) {}
  static Fl_Gl_Choice *find_begin(int m, const int *alistp);
  // Return one of these structures for a given gl mode.
  // The second argument is a glX attribute list, and is used if mode is zero.
  // This is not supported on Win32:
  virtual Fl_Gl_Choice *find(int mode, const int *alistp) {return NULL;}
  virtual GLContext create_gl_context(Fl_Window* window, const Fl_Gl_Choice* g, int layer = 0) {return 0;}
  virtual void set_gl_context(Fl_Window* w, GLContext context) {}
  virtual void delete_gl_context(GLContext) {}
  virtual void make_overlay(void* &o);
  virtual void hide_overlay() {}
  virtual void make_overlay_current() {}
  virtual void redraw_overlay() {}
  virtual int can_do_overlay() {return 0;}
  virtual void waitGL() {} // support for gl_finish() function
  virtual void gl_visual(Fl_Gl_Choice*); // support for Fl::gl_visual() function
  virtual void gl_start() {} // support for gl_start() function
  virtual void* GetProcAddress(const char *procName); // support for glutGetProcAddress()
  virtual void draw_string(const char* str, int n); // support for gl_draw()
  virtual void get_list(Fl_Font_Descriptor* fd, int r) {} // support for gl_draw() without textures
  virtual void gl_bitmap_font(Fl_Font_Descriptor *fl_fontsize) {} // support for gl_font() without textures
  virtual int overlay_color(Fl_Color i) {return 0;} // support for gl_color() with HAVE_GL_OVERLAY
};

#ifdef FL_CFG_GFX_QUARTZ
#ifdef __OBJC__
@class NSOpenGLPixelFormat;
#else
class NSOpenGLPixelFormat;
#endif // __OBJC__

class Fl_Cocoa_Gl_Window_Driver : public Fl_Gl_Window_Driver {
  friend class Fl_Gl_Window_Driver;
  Fl_Cocoa_Gl_Window_Driver(Fl_Gl_Window *win) : Fl_Gl_Window_Driver(win) {}
  virtual float pixels_per_unit();
  virtual void before_show(int& need_redraw);
  virtual void after_show(int need_redraw);
  virtual int mode_(int m, const int *a);
  virtual void make_current_before();
  virtual void swap_buffers();
  virtual void resize(int is_a_resize, int w, int h);
  virtual char swap_type();
  virtual void flush_context();
  virtual Fl_Gl_Choice *find(int m, const int *alistp);
  virtual GLContext create_gl_context(Fl_Window* window, const Fl_Gl_Choice* g, int layer = 0);
  virtual void set_gl_context(Fl_Window* w, GLContext context);
  virtual void delete_gl_context(GLContext);
  virtual void make_overlay_current();
  virtual void redraw_overlay();
  virtual void gl_start();
  virtual void draw_string(const char* str, int n);
  static NSOpenGLContext* create_GLcontext_for_window(NSOpenGLPixelFormat *pixelformat, NSOpenGLContext *shared_ctx, Fl_Window *window);
  static NSOpenGLPixelFormat *mode_to_NSOpenGLPixelFormat(int mode, const int*); // uses Objective-c
  static void GLcontext_update(NSOpenGLContext*); // uses Objective-c
  static void GLcontext_release(NSOpenGLContext*); // uses Objective-c
  static void GLcontext_makecurrent(NSOpenGLContext*); // uses Objective-c
  static void GL_cleardrawable(void); // uses Objective-c
};
#endif // FL_CFG_GFX_QUARTZ


#ifdef FL_CFG_GFX_GDI

class Fl_WinAPI_Gl_Window_Driver : public Fl_Gl_Window_Driver {
  friend class Fl_Gl_Window_Driver;
  Fl_WinAPI_Gl_Window_Driver(Fl_Gl_Window *win) : Fl_Gl_Window_Driver(win) {}
  virtual int mode_(int m, const int *a);
  virtual void make_current_after();
  virtual void swap_buffers();
  virtual void invalidate() {}
  virtual int flush_begin(char& valid_f);
  virtual void hide_overlay(void *& overlay);
  virtual Fl_Gl_Choice *find(int m, const int *alistp);
  virtual GLContext create_gl_context(Fl_Window* window, const Fl_Gl_Choice* g, int layer = 0);
  virtual void set_gl_context(Fl_Window* w, GLContext context);
  virtual void delete_gl_context(GLContext);
  virtual void make_overlay_current();
  virtual void redraw_overlay();
  virtual void* GetProcAddress(const char *procName);
  virtual void gl_bitmap_font(Fl_Font_Descriptor *fl_fontsize);
  virtual void get_list(Fl_Font_Descriptor *fd, int r);
#if HAVE_GL_OVERLAY
  virtual int can_do_overlay();
  virtual int overlay_color(Fl_Color i);
#endif
};

#endif // FL_CFG_GFX_GDI


#ifdef FL_CFG_GFX_XLIB
#include <X11/Xutil.h>
class Fl_X11_Gl_Window_Driver : public Fl_Gl_Window_Driver {
  friend class Fl_Gl_Window_Driver;
  Fl_X11_Gl_Window_Driver(Fl_Gl_Window *win) : Fl_Gl_Window_Driver(win) {}
  virtual void before_show(int& need_redraw);
  virtual int mode_(int m, const int *a);
  virtual void swap_buffers();
  virtual void resize(int is_a_resize, int w, int h);
  virtual char swap_type();
  virtual Fl_Gl_Choice *find(int m, const int *alistp);
  virtual GLContext create_gl_context(Fl_Window* window, const Fl_Gl_Choice* g, int layer = 0);
  virtual void set_gl_context(Fl_Window* w, GLContext context);
  virtual void delete_gl_context(GLContext);
#if HAVE_GL_OVERLAY
  virtual void make_overlay(void *&o);
  virtual int can_do_overlay();
  virtual void hide_overlay();
  virtual int overlay_color(Fl_Color i);
#endif
  virtual void make_overlay_current();
  virtual void redraw_overlay();
  virtual void waitGL();
  virtual void gl_visual(Fl_Gl_Choice*); // support for Fl::gl_visual()
  virtual void gl_start();
  virtual void gl_bitmap_font(Fl_Font_Descriptor *fl_fontsize);
  virtual void get_list(Fl_Font_Descriptor *fd, int r);
public:
  static GLContext create_gl_context(XVisualInfo* vis);
};

#endif // FL_CFG_GFX_XLIB

#endif /* Fl_Gl_Window_Driver_H */

//
// End of "$Id$".
//