// glut.h

// Emulation of Glut using fltk.

// GLUT is Copyright (c) Mark J. Kilgard, 1994, 1995, 1996:
// "This program is freely distributable without licensing fees  and is
// provided without guarantee or warrantee expressed or  implied. This
// program is -not- in the public domain."

// Although I have copied the GLUT API, none of my code is based on
// any Glut implementation details and is therefore covered by the LGPL.

// Fltk does not include the Glut drawing functions (such as
// glutWireTeapot()) or the stroke fonts but the declarations for the
// drawing functions are included here because otherwise there is no
// way to get them along with this.  To use them you will have to
// link in the original Glut library, put -lglut *after* -lfltk.

// Commented out lines indicate parts of Glut that are not emulated.

#ifndef __glut_h__
#define __glut_h__

#include <FL/gl.h>
#include <GL/glu.h>

////////////////////////////////////////////////////////////////
// Glut is emulated using this window class and these static variables
// (plus several more static variables hidden in glut.C):

#include "Fl.H"
#include "Fl_Gl_Window.H"

class Fl_Glut_Window : public Fl_Gl_Window {
  void draw();
  void draw_overlay();
  int handle(int);
  void _init();
  int mouse_down;
public: // so the inline functions work
  int number;
  int menu[3];
  void make_current();
  void (*display)();
  void (*overlaydisplay)();
  void (*reshape)(int w, int h);
  void (*keyboard)(uchar, int x, int y);
  void (*mouse)(int b, int state, int x, int y);
  void (*motion)(int x, int y);
  void (*passivemotion)(int x, int y);
  void (*entry)(int);
  void (*visibility)(int);
  void (*special)(int, int x, int y);
  Fl_Glut_Window(int w, int h, const char *);
  Fl_Glut_Window(int x, int y, int w, int h, const char *);
  ~Fl_Glut_Window();
};

extern Fl_Glut_Window *glut_window;	// the current window
extern int glut_menu;			// the current menu

// function pointers that are not per-window:
extern void (*glut_idle_function)();
extern void (*glut_menustate_function)(int);
extern void (*glut_menustatus_function)(int,int,int);

////////////////////////////////////////////////////////////////

//#define GLUT_API_VERSION This does not match any version of Glut exactly...

void glutInit(int *argcp, char **argv); // creates first window

void glutInitDisplayMode(unsigned int mode);
// the FL_ symbols have the same value as the GLUT ones:
#define GLUT_RGB	FL_RGB
#define GLUT_RGBA	FL_RGB
#define GLUT_INDEX	FL_INDEX
#define GLUT_SINGLE	FL_SINGLE
#define GLUT_DOUBLE	FL_DOUBLE
#define GLUT_ACCUM	FL_ACCUM
#define GLUT_ALPHA	FL_ALPHA
#define GLUT_DEPTH	FL_DEPTH
#define GLUT_STENCIL	FL_STENCIL
#define GLUT_MULTISAMPLE FL_MULTISAMPLE
// #define GLUT_STEREO			256
// #define GLUT_LUMINANCE		512

void glutInitWindowPosition(int x, int y);

void glutInitWindowSize(int w, int h);

void glutMainLoop();

int glutCreateWindow(char *title);

int glutCreateSubWindow(int win, int x, int y, int width, int height);

void glutDestroyWindow(int win);

inline void glutPostRedisplay() {glut_window->redraw();}

void glutSwapBuffers();

inline int glutGetWindow() {return glut_window->number;}

void glutSetWindow(int win);

inline void glutSetWindowTitle(char *t) {glut_window->label(t);}

inline void glutSetIconTitle(char *t) {glut_window->iconlabel(t);}

inline void glutPositionWindow(int x, int y) {glut_window->position(x,y);}

inline void glutReshapeWindow(int w, int h) {glut_window->size(w,h);}

inline void glutPopWindow() {glut_window->show();}

//inline void glutPushWindow();

inline void glutIconifyWindow() {glut_window->iconize();}

inline void glutShowWindow() {glut_window->show();}

inline void glutHideWindow() {glut_window->hide();}

inline void glutFullScreen() {glut_window->fullscreen();}

inline void glutSetCursor(Fl_Cursor cursor) {glut_window->cursor(cursor);}
// notice that the numeric values are different than glut:
#define GLUT_CURSOR_RIGHT_ARROW	((Fl_Cursor)2)
#define GLUT_CURSOR_LEFT_ARROW	((Fl_Cursor)67)
#define GLUT_CURSOR_INFO	FL_CURSOR_HAND
#define GLUT_CURSOR_DESTROY	((Fl_Cursor)45)
#define GLUT_CURSOR_HELP	FL_CURSOR_HELP
#define GLUT_CURSOR_CYCLE	((Fl_Cursor)26)
#define GLUT_CURSOR_SPRAY	((Fl_Cursor)63)
#define GLUT_CURSOR_WAIT	FL_CURSOR_WAIT
#define GLUT_CURSOR_TEXT	FL_CURSOR_INSERT
#define GLUT_CURSOR_CROSSHAIR	FL_CURSOR_CROSS
#define GLUT_CURSOR_UP_DOWN	FL_CURSOR_NS
#define GLUT_CURSOR_LEFT_RIGHT	FL_CURSOR_WE
#define GLUT_CURSOR_TOP_SIDE	FL_CURSOR_N
#define GLUT_CURSOR_BOTTOM_SIDE	FL_CURSOR_S
#define GLUT_CURSOR_LEFT_SIDE	FL_CURSOR_W
#define GLUT_CURSOR_RIGHT_SIDE	FL_CURSOR_E
#define GLUT_CURSOR_TOP_LEFT_CORNER	FL_CURSOR_NW
#define GLUT_CURSOR_TOP_RIGHT_CORNER	FL_CURSOR_NE
#define GLUT_CURSOR_BOTTOM_RIGHT_CORNER	FL_CURSOR_SE
#define GLUT_CURSOR_BOTTOM_LEFT_CORNER	FL_CURSOR_SW
#define GLUT_CURSOR_INHERIT		FL_CURSOR_DEFAULT
#define GLUT_CURSOR_NONE		FL_CURSOR_NONE
#define GLUT_CURSOR_FULL_CROSSHAIR	FL_CURSOR_CROSS

//inline void glutWarpPointer(int x, int y);

inline void glutEstablishOverlay() {glut_window->make_overlay_current();}

inline void glutRemoveOverlay() {glut_window->hide_overlay();}

inline void glutUseLayer(GLenum layer) {
  layer ? glut_window->make_overlay_current() : glut_window->make_current();}
enum {GLUT_NORMAL, GLUT_OVERLAY};

inline void glutPostOverlayRedisplay() {glut_window->redraw_overlay();}

inline void glutShowOverlay() {glut_window->redraw_overlay();}

inline void glutHideOverlay() {glut_window->hide_overlay();}

int glutCreateMenu(void (*)(int));

void glutDestroyMenu(int menu);

inline int glutGetMenu() {return glut_menu;}

inline void glutSetMenu(int m) {glut_menu = m;}

void glutAddMenuEntry(char *label, int value);

void glutAddSubMenu(char *label, int submenu);

void glutChangeToMenuEntry(int item, char *label, int value);

void glutChangeToSubMenu(int item, char *label, int submenu);

void glutRemoveMenuItem(int item);

inline void glutAttachMenu(int b) {glut_window->menu[b] = glut_menu;}

inline void glutDetachMenu(int b) {glut_window->menu[b] = 0;}

inline void glutDisplayFunc(void (*f)()) {glut_window->display = f;}

inline void glutReshapeFunc(void (*f)(int w, int h)) {glut_window->reshape=f;}

inline void glutKeyboardFunc(void (*f)(uchar key, int x, int y)) {
  glut_window->keyboard = f;}

inline void glutMouseFunc(void (*f)(int b, int state, int x, int y)) {
  glut_window->mouse = f;}
#define GLUT_LEFT_BUTTON		0
#define GLUT_MIDDLE_BUTTON		1
#define GLUT_RIGHT_BUTTON		2
#define GLUT_DOWN			0
#define GLUT_UP				1

inline void glutMotionFunc(void (*f)(int x, int y)) {glut_window->motion= f;}

inline void glutPassiveMotionFunc(void (*f)(int x, int y)) {
  glut_window->passivemotion= f;}

inline void glutEntryFunc(void (*f)(int s)) {glut_window->entry = f;}
enum {GLUT_LEFT, GLUT_ENTERED};

inline void glutVisibilityFunc(void (*f)(int s)) {glut_window->visibility=f;}
enum {GLUT_NOT_VISIBLE, GLUT_VISIBLE};

inline void glutIdleFunc(void (*f)()) {Fl::set_idle(f);}

// Warning: this cast may not work on all machines:
inline void glutTimerFunc(unsigned int msec, void (*f)(int), int value) {
  Fl::add_timeout(msec*.001, (void (*)(void *))f, (void *)value);
}

inline void glutMenuStateFunc(void (*f)(int state)) {
  glut_menustate_function = f;}

inline void glutMenuStatusFunc(void (*f)(int status, int x, int y)) {
  glut_menustatus_function = f;}
enum {GLUT_MENU_NOT_IN_USE, GLUT_MENU_IN_USE};

inline void glutSpecialFunc(void (*f)(int key, int x, int y)) {
  glut_window->special = f;}
#define GLUT_KEY_F1			1
#define GLUT_KEY_F2			2
#define GLUT_KEY_F3			3
#define GLUT_KEY_F4			4
#define GLUT_KEY_F5			5
#define GLUT_KEY_F6			6
#define GLUT_KEY_F7			7
#define GLUT_KEY_F8			8
#define GLUT_KEY_F9			9
#define GLUT_KEY_F10			10
#define GLUT_KEY_F11			11
#define GLUT_KEY_F12			12
// WARNING: Different values than Glut uses:
#define GLUT_KEY_LEFT			FL_Left
#define GLUT_KEY_UP			FL_Up
#define GLUT_KEY_RIGHT			FL_Right
#define GLUT_KEY_DOWN			FL_Down
#define GLUT_KEY_PAGE_UP		FL_Page_Up
#define GLUT_KEY_PAGE_DOWN		FL_Page_Down
#define GLUT_KEY_HOME			FL_Home
#define GLUT_KEY_END			FL_End
#define GLUT_KEY_INSERT			FL_Insert

//inline void glutSpaceballMotionFunc(void (*)(int x, int y, int z));

//inline void glutSpaceballRotateFunc(void (*)(int x, int y, int z));

//inline void glutSpaceballButtonFunc(void (*)(int button, int state));

//inline void glutButtonBoxFunc(void (*)(int button, int state));

//inline void glutDialsFunc(void (*)(int dial, int value));

//inline void glutTabletMotionFunc(void (*)(int x, int y));

//inline void glutTabletButtonFunc(void (*)(int button, int state, int x, int y));

inline void glutOverlayDisplayFunc(void (*f)()) {
  glut_window->overlaydisplay = f;}

//inline void glutWindowStatusFunc(void (*)(int state));
//enum {GLUT_HIDDEN, GLUT_FULLY_RETAINED, GLUT_PARTIALLY_RETAINED,
//	GLUT_FULLY_COVERED};

//inline void glutSetColor(int, GLfloat red, GLfloat green, GLfloat blue);

//inline GLfloat glutGetColor(int ndx, int component);
//#define GLUT_RED			0
//#define GLUT_GREEN			1
//#define GLUT_BLUE			2

//inline void glutCopyColormap(int win);

// Warning: values are changed from Glut!
// Also relies on the GL_ symbols having values greater than 100
int glutGet(GLenum type);
enum {
  GLUT_RETURN_ZERO = 0,
  GLUT_WINDOW_X,
  GLUT_WINDOW_Y,
  GLUT_WINDOW_WIDTH,
  GLUT_WINDOW_HEIGHT,
  GLUT_WINDOW_PARENT,
//GLUT_WINDOW_NUM_CHILDREN,
//GLUT_WINDOW_CURSOR,
  GLUT_SCREEN_WIDTH,
  GLUT_SCREEN_HEIGHT,
//GLUT_SCREEN_WIDTH_MM,
//GLUT_SCREEN_HEIGHT_MM,
  GLUT_MENU_NUM_ITEMS,
  GLUT_DISPLAY_MODE_POSSIBLE,
  GLUT_INIT_WINDOW_X,
  GLUT_INIT_WINDOW_Y,
  GLUT_INIT_WINDOW_WIDTH,
  GLUT_INIT_WINDOW_HEIGHT,
  GLUT_INIT_DISPLAY_MODE,
//GLUT_ELAPSED_TIME,
  GLUT_WINDOW_BUFFER_SIZE
};

#define GLUT_WINDOW_STENCIL_SIZE	GL_STENCIL_BITS
#define GLUT_WINDOW_DEPTH_SIZE		GL_DEPTH_BITS
#define GLUT_WINDOW_RED_SIZE		GL_RED_BITS
#define GLUT_WINDOW_GREEN_SIZE		GL_GREEN_BITS
#define GLUT_WINDOW_BLUE_SIZE		GL_BLUE_BITS
#define GLUT_WINDOW_ALPHA_SIZE		GL_ALPHA_BITS
#define GLUT_WINDOW_ACCUM_RED_SIZE	GL_ACCUM_RED_BITS
#define GLUT_WINDOW_ACCUM_GREEN_SIZE	GL_ACCUM_GREEN_BITS
#define GLUT_WINDOW_ACCUM_BLUE_SIZE	GL_ACCUM_BLUE_BITS
#define GLUT_WINDOW_ACCUM_ALPHA_SIZE	GL_ACCUM_ALPHA_BITS
#define GLUT_WINDOW_DOUBLEBUFFER	GL_DOUBLEBUFFER
#define GLUT_WINDOW_RGBA		GL_RGBA
#define GLUT_WINDOW_COLORMAP_SIZE	GL_INDEX_BITS
#ifdef GL_SAMPLES_SGIS
#define GLUT_WINDOW_NUM_SAMPLES		GL_SAMPLES_SGIS
#else
#define GLUT_WINDOW_NUM_SAMPLES		GLUT_RETURN_ZERO
#endif
#define GLUT_WINDOW_STEREO		GL_STEREO

//int glutDeviceGet(GLenum type);
//#define GLUT_HAS_KEYBOARD		600
//#define GLUT_HAS_MOUSE		601
//#define GLUT_HAS_SPACEBALL		602
//#define GLUT_HAS_DIAL_AND_BUTTON_BOX	603
//#define GLUT_HAS_TABLET		604
//#define GLUT_NUM_MOUSE_BUTTONS	605
//#define GLUT_NUM_SPACEBALL_BUTTONS	606
//#define GLUT_NUM_BUTTON_BOX_BUTTONS	607
//#define GLUT_NUM_DIALS		608
//#define GLUT_NUM_TABLET_BUTTONS	609

inline int glutGetModifiers() {return Fl::event_state();}
// WARNING: these values are different than Glut uses:
#define GLUT_ACTIVE_SHIFT               FL_SHIFT
#define GLUT_ACTIVE_CTRL                FL_CTRL
#define GLUT_ACTIVE_ALT                 FL_ALT

int glutLayerGet(GLenum);
#define GLUT_OVERLAY_POSSIBLE		800
//#define GLUT_LAYER_IN_USE		801
//#define GLUT_HAS_OVERLAY		802
#define GLUT_TRANSPARENT_INDEX		803
#define GLUT_NORMAL_DAMAGED		804
#define GLUT_OVERLAY_DAMAGED		805

//inline int glutVideoResizeGet(GLenum param);
//#define GLUT_VIDEO_RESIZE_POSSIBLE	900
//#define GLUT_VIDEO_RESIZE_IN_USE	901
//#define GLUT_VIDEO_RESIZE_X_DELTA	902
//#define GLUT_VIDEO_RESIZE_Y_DELTA	903
//#define GLUT_VIDEO_RESIZE_WIDTH_DELTA	904
//#define GLUT_VIDEO_RESIZE_HEIGHT_DELTA 905
//#define GLUT_VIDEO_RESIZE_X		906
//#define GLUT_VIDEO_RESIZE_Y		907
//#define GLUT_VIDEO_RESIZE_WIDTH	908
//#define GLUT_VIDEO_RESIZE_HEIGHT	909

//inline void glutSetupVideoResizing();

//inline void glutStopVideoResizing();

//inline void glutVideoResize(int x, int y, int width, int height);

//inline void glutVideoPan(int x, int y, int width, int height);

////////////////////////////////////////////////////////////////
// Emulated Glut drawing functions:

// Font argument must be a void* for compatability, so...
extern struct Glut_Bitmap_Font {uchar font; int size;}
  glutBitmap9By15, glutBitmap8By13, glutBitmapTimesRoman10,
  glutBitmapTimesRoman24, glutBitmapHelvetica10, glutBitmapHelvetica12,
  glutBitmapHelvetica18;
#define GLUT_BITMAP_9_BY_15             (&glutBitmap9By15)
#define GLUT_BITMAP_8_BY_13             (&glutBitmap8By13)
#define GLUT_BITMAP_TIMES_ROMAN_10      (&glutBitmapTimesRoman10)
#define GLUT_BITMAP_TIMES_ROMAN_24      (&glutBitmapTimesRoman24)
#define GLUT_BITMAP_HELVETICA_10        (&glutBitmapHelvetica10)
#define GLUT_BITMAP_HELVETICA_12        (&glutBitmapHelvetica12)
#define GLUT_BITMAP_HELVETICA_18        (&glutBitmapHelvetica18)

void glutBitmapCharacter(void *font, int character);
int glutBitmapWidth(void *font, int character);

////////////////////////////////////////////////////////////////
// Glut drawing functions.  These are NOT emulated but you can
// link in the glut library to get them.  This assummes the object
// files in Glut remain as they currently are so that there are
// not symbol conflicts with the above.

extern "C" {

extern int glutExtensionSupported(char *name);

/* Stroke font opaque addresses (use constants instead in source code). */
extern void *glutStrokeRoman;
extern void *glutStrokeMonoRoman;

/* Stroke font constants (use these in GLUT program). */
#define GLUT_STROKE_ROMAN		(&glutStrokeRoman)
#define GLUT_STROKE_MONO_ROMAN		(&glutStrokeMonoRoman)

/* GLUT font sub-API */
extern void glutStrokeCharacter(void *font, int character);
extern int glutStrokeWidth(void *font, int character);

/* GLUT pre-built models sub-API */
extern void glutWireSphere(GLdouble radius, GLint slices, GLint stacks);
extern void glutSolidSphere(GLdouble radius, GLint slices, GLint stacks);
extern void glutWireCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);
extern void glutSolidCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);
extern void glutWireCube(GLdouble size);
extern void glutSolidCube(GLdouble size);
extern void glutWireTorus(GLdouble innerRadius, GLdouble outerRadius, GLint sides, GLint rings);
extern void glutSolidTorus(GLdouble innerRadius, GLdouble outerRadius, GLint sides, GLint rings);
extern void glutWireDodecahedron();
extern void glutSolidDodecahedron();
extern void glutWireTeapot(GLdouble size);
extern void glutSolidTeapot(GLdouble size);
extern void glutWireOctahedron();
extern void glutSolidOctahedron();
extern void glutWireTetrahedron();
extern void glutSolidTetrahedron();
extern void glutWireIcosahedron();
extern void glutSolidIcosahedron();

}

#endif                  /* __glut_h__ */