4 * The freeglut library private include file.
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Thu Dec 2 1999
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #ifndef FREEGLUT_INTERNAL_H
29 #define FREEGLUT_INTERNAL_H
35 /* XXX Update these for each release! */
36 #define VERSION_MAJOR 2
37 #define VERSION_MINOR 2
38 #define VERSION_PATCH 0
40 /* Freeglut is meant to be available under all Unix/X11 and Win32 platforms. */
41 #if defined(_WIN32_WCE)
42 # define TARGET_HOST_UNIX_X11 0
43 # define TARGET_HOST_WIN32 0
44 # define TARGET_HOST_WINCE 1
45 #elif defined(_MSC_VER) || defined(__CYGWIN__) || defined(__MINGW32__)
46 # define TARGET_HOST_UNIX_X11 0
47 # define TARGET_HOST_WIN32 1
48 # define TARGET_HOST_WINCE 0
50 # define TARGET_HOST_UNIX_X11 1
51 # define TARGET_HOST_WIN32 0
52 # define TARGET_HOST_WINCE 0
55 #define FREEGLUT_MAX_MENUS 3
57 /* Somehow all Win32 include headers depend on this one: */
66 #define strdup _strdup
69 /* Those files should be available on every platform. */
77 #if TARGET_HOST_UNIX_X11
82 /* The system-dependant include files should go here: */
83 #if TARGET_HOST_UNIX_X11
86 #include <X11/Xatom.h>
87 #include <X11/keysym.h>
89 #ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
90 #include <X11/extensions/xf86vmode.h>
94 /* Microsoft VisualC++ 5.0's <math.h> does not define the PI */
96 # define M_PI 3.14159265358979323846
107 /* -- GLOBAL TYPE DEFINITIONS ---------------------------------------------- */
109 /* Freeglut callbacks type definitions */
110 typedef void (* FGCBDisplay )( void );
111 typedef void (* FGCBReshape )( int, int );
112 typedef void (* FGCBVisibility )( int );
113 typedef void (* FGCBKeyboard )( unsigned char, int, int );
114 typedef void (* FGCBSpecial )( int, int, int );
115 typedef void (* FGCBMouse )( int, int, int, int );
116 typedef void (* FGCBMouseWheel )( int, int, int, int );
117 typedef void (* FGCBMotion )( int, int );
118 typedef void (* FGCBPassive )( int, int );
119 typedef void (* FGCBEntry )( int );
120 typedef void (* FGCBWindowStatus )( int );
121 typedef void (* FGCBSelect )( int, int, int );
122 typedef void (* FGCBJoystick )( unsigned int, int, int, int );
123 typedef void (* FGCBKeyboardUp )( unsigned char, int, int );
124 typedef void (* FGCBSpecialUp )( int, int, int );
125 typedef void (* FGCBOverlayDisplay)( void );
126 typedef void (* FGCBSpaceMotion )( int, int, int );
127 typedef void (* FGCBSpaceRotation )( int, int, int );
128 typedef void (* FGCBSpaceButton )( int, int );
129 typedef void (* FGCBDials )( int, int );
130 typedef void (* FGCBButtonBox )( int, int );
131 typedef void (* FGCBTabletMotion )( int, int );
132 typedef void (* FGCBTabletButton )( int, int, int, int );
133 typedef void (* FGCBDestroy )( void );
135 /* The global callbacks type definitions */
136 typedef void (* FGCBIdle )( void );
137 typedef void (* FGCBTimer )( int );
138 typedef void (* FGCBMenuState )( int );
139 typedef void (* FGCBMenuStatus )( int, int, int );
141 /* The callback used when creating/using menus */
142 typedef void (* FGCBMenu )( int );
145 /* A list structure */
146 typedef struct tagSFG_List SFG_List;
153 /* A list node structure */
154 typedef struct tagSFG_Node SFG_Node;
161 /* A helper structure holding two ints and a boolean */
162 typedef struct tagSFG_XYUse SFG_XYUse;
165 GLint X, Y; /* The two integers... */
166 GLboolean Use; /* ...and a single boolean. */
169 /* A helper structure holding a timeval and a boolean */
170 typedef struct tagSFG_Time SFG_Time;
173 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
176 struct timeval Value;
182 * An enumeration containing the state of the GLUT execution:
183 * initializing, running, or stopping
187 GLUT_EXEC_STATE_INIT,
188 GLUT_EXEC_STATE_RUNNING,
192 /* This structure holds different freeglut settings */
193 typedef struct tagSFG_State SFG_State;
196 SFG_XYUse Position; /* The default windows' position */
197 SFG_XYUse Size; /* The default windows' size */
198 unsigned int DisplayMode; /* Display mode for new windows */
200 GLboolean Initialised; /* freeglut has been initialised */
202 int DirectContext; /* Direct rendering state */
204 GLboolean ForceIconic; /* New top windows are iconified */
205 GLboolean UseCurrentContext; /* New windows share with current */
207 GLboolean GLDebugSwitch; /* OpenGL state debugging switch */
208 GLboolean XSyncSwitch; /* X11 sync protocol switch */
210 int KeyRepeat; /* Global key repeat mode. */
211 int Modifiers; /* Current ALT/SHIFT/CTRL state */
213 GLuint FPSInterval; /* Interval between FPS printfs */
214 GLuint SwapCount; /* Count of glutSwapBuffer calls */
215 GLuint SwapTime; /* Time of last SwapBuffers */
217 SFG_Time Time; /* Time that glutInit was called */
218 SFG_List Timers; /* The freeglut timer hooks */
219 SFG_List FreeTimers; /* The unused timer hooks */
221 FGCBIdle IdleCallback; /* The global idle callback */
223 int ActiveMenus; /* Num. of currently active menus */
224 FGCBMenuState MenuStateCallback; /* Menu callbacks are global */
225 FGCBMenuStatus MenuStatusCallback;
227 SFG_XYUse GameModeSize; /* Game mode screen's dimensions */
228 int GameModeDepth; /* The pixel depth for game mode */
229 int GameModeRefresh; /* The refresh rate for game mode */
231 int ActionOnWindowClose; /* Action when user closes window */
233 fgExecutionState ExecState; /* Used for GLUT termination */
234 char *ProgramName; /* Name of the invoking program */
235 GLboolean JoysticksInitialised; /* Only initialize if application calls for them */
238 /* The structure used by display initialization in freeglut_init.c */
239 typedef struct tagSFG_Display SFG_Display;
240 struct tagSFG_Display
242 #if TARGET_HOST_UNIX_X11
243 Display* Display; /* The display we are being run in. */
244 int Screen; /* The screen we are about to use. */
245 Window RootWindow; /* The screen's root window. */
246 int Connection; /* The display's connection number */
247 Atom DeleteWindow; /* The window deletion atom */
249 #ifdef X_XF86VidModeGetModeLine
251 * XF86VidMode may be compilable even if it fails at runtime. Therefore,
252 * the validity of the VidMode has to be tracked
254 int DisplayModeValid; /* Flag that indicates runtime status*/
255 XF86VidModeModeLine DisplayMode; /* Current screen's display settings */
256 int DisplayModeClock; /* The display mode's refresh rate */
257 int DisplayViewPortX; /* saved X location of the viewport */
258 int DisplayViewPortY; /* saved Y location of the viewport */
259 int DisplayPointerX; /* saved X location of the pointer */
260 int DisplayPointerY; /* saved Y location of the pointer */
264 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
265 HINSTANCE Instance; /* The application's instance */
266 DEVMODE DisplayMode; /* Desktop's display settings */
270 int ScreenWidth; /* The screen's width in pixels */
271 int ScreenHeight; /* The screen's height in pixels */
272 int ScreenWidthMM; /* The screen's width in milimeters */
273 int ScreenHeightMM; /* The screen's height in milimeters */
277 /* The user can create any number of timer hooks */
278 typedef struct tagSFG_Timer SFG_Timer;
282 int ID; /* The timer ID integer */
283 FGCBTimer Callback; /* The timer callback */
284 long TriggerTime; /* The timer trigger time */
288 * Make "freeglut" window handle and context types so that we don't need so
289 * much conditionally-compiled code later in the library.
291 #if TARGET_HOST_UNIX_X11
293 typedef Window SFG_WindowHandleType ;
294 typedef GLXContext SFG_WindowContextType ;
296 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
298 typedef HWND SFG_WindowHandleType ;
299 typedef HGLRC SFG_WindowContextType ;
304 * A window and its OpenGL context. The contents of this structure
305 * are highly dependant on the target operating system we aim at...
307 typedef struct tagSFG_Context SFG_Context;
308 struct tagSFG_Context
310 SFG_WindowHandleType Handle; /* The window's handle */
311 SFG_WindowContextType Context; /* The window's OpenGL/WGL context */
313 #if TARGET_HOST_UNIX_X11
314 XVisualInfo* VisualInfo; /* The window's visual information */
315 Pixmap Pixmap; /* Used for offscreen rendering */
316 /* GLXPixmap GLXPixMap; */ /* Used for offscreen rendering */
317 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
318 HDC Device; /* The window's device context */
321 int DoubleBuffered; /* Treat the window as double-buffered */
324 /* Window's state description. This structure should be kept portable. */
325 typedef struct tagSFG_WindowState SFG_WindowState;
326 struct tagSFG_WindowState
328 int Width; /* Window's width in pixels */
329 int Height; /* The same about the height */
330 int OldWidth; /* Window width from before a resize */
331 int OldHeight; /* " height " " " " */
333 GLboolean Redisplay; /* Do we have to redisplay? */
334 GLboolean Visible; /* Is the window visible now */
336 int Cursor; /* The currently selected cursor */
338 long JoystickPollRate; /* The joystick polling rate */
339 long JoystickLastPoll; /* When the last poll happened */
341 int MouseX, MouseY; /* The most recent mouse position */
343 GLboolean IgnoreKeyRepeat; /* Whether to ignore key repeat. */
344 GLboolean KeyRepeating; /* Currently in repeat mode */
346 GLboolean IsGameMode; /* Is this the game mode window? */
347 GLboolean NeedToResize; /* Do we need to resize the window? */
352 * SET_WCB() is used as:
354 * SET_WCB( window, Visibility, func );
356 * ...where {window} is the freeglut window to set the callback,
357 * {Visibility} is the window-specific callback to set,
358 * {func} is a function-pointer.
360 * Originally, {FETCH_WCB( ... ) = func} was rather sloppily used,
361 * but this can cause warnings because the FETCH_WCB() macro type-
362 * casts its result, and a type-cast value shouldn't be an lvalue.
364 * The {if( FETCH_WCB( ... ) != func )} test is to do type-checking
365 * and for no other reason. Since it's hidden in the macro, the
366 * ugliness is felt to be rather benign.
368 #define SET_WCB(window,cbname,func) \
371 if( FETCH_WCB( window, cbname ) != func ) \
372 (((window).CallBacks[CB_ ## cbname]) = (void *) func); \
376 * FETCH_WCB() is used as:
378 * FETCH_WCB( window, Visibility );
380 * ...where {window} is the freeglut window to fetch the callback from,
381 * {Visibility} is the window-specific callback to fetch.
383 * The result is correctly type-cast to the callback function pointer
386 #define FETCH_WCB(window,cbname) \
387 ((FGCB ## cbname)((window).CallBacks[CB_ ## cbname]))
390 * INVOKE_WCB() is used as:
392 * INVOKE_WCB( window, Visibility, ( status ) );
394 * ...where {window} is the freeglut window,
395 * {Visibility} is the window-specific callback,
396 * {(status)} is the parameter list.
398 * The callback is invoked as:
400 * callback( status );
402 * ...so the parentheses are REQUIRED in the {arg_list}.
404 * NOTE that it does a sanity-check and also sets the
408 #define INVOKE_WCB(window,cbname,arg_list) \
411 if( FETCH_WCB( window, cbname ) ) \
413 fgSetWindow( &window ); \
414 FETCH_WCB( window, cbname ) arg_list; \
419 * The window callbacks the user can supply us with. Should be kept portable.
421 * This enumeration provides the freeglut CallBack numbers.
422 * The symbolic constants are indices into a window's array of
423 * function callbacks. The names are formed by splicing a common
424 * prefix onto the callback's base name. (This was originally
425 * done so that an early stage of development could live side-by-
426 * side with the old callback code. The old callback code used
427 * the bare callback's name as a structure member, so I used a
428 * prefix for the array index name.)
430 * XXX For consistancy, perhaps the prefix should match the
431 * XXX FETCH* and INVOKE* macro suffices. I.e., WCB_, rather than
452 /* Presently ignored */
463 /* Always make this the LAST one */
468 /* This structure holds the OpenGL rendering context for all the menu windows */
469 typedef struct tagSFG_MenuContext SFG_MenuContext;
470 struct tagSFG_MenuContext
472 #if TARGET_HOST_UNIX_X11
473 XVisualInfo* VisualInfo; /* The window's visual information */
476 SFG_WindowContextType Context; /* The menu window's WGL context */
479 /* This structure describes a menu */
480 typedef struct tagSFG_Window SFG_Window;
481 typedef struct tagSFG_MenuEntry SFG_MenuEntry;
482 typedef struct tagSFG_Menu SFG_Menu;
486 void *UserData; /* User data passed back at callback */
487 int ID; /* The global menu ID */
488 SFG_List Entries; /* The menu entries list */
489 FGCBMenu Callback; /* The menu callback */
490 FGCBDestroy Destroy; /* Destruction callback */
491 GLboolean IsActive; /* Is the menu selected? */
492 int Width; /* Menu box width in pixels */
493 int Height; /* Menu box height in pixels */
494 int X, Y; /* Menu box raster position */
496 SFG_MenuEntry *ActiveEntry; /* Currently active entry in the menu */
497 SFG_Window *Window; /* Window for menu */
498 SFG_Window *ParentWindow; /* Window in which the menu is defined */
501 /* This is a menu entry */
502 struct tagSFG_MenuEntry
505 int ID; /* The menu entry ID (local) */
506 int Ordinal; /* The menu's ordinal number */
507 char* Text; /* The text to be displayed */
508 SFG_Menu* SubMenu; /* Optional sub-menu tree */
509 GLboolean IsActive; /* Is the entry highlighted? */
510 int Width; /* Label's width in pixels */
514 * A window, making part of freeglut windows hierarchy.
515 * Should be kept portable.
520 int ID; /* Window's ID number */
522 SFG_Context Window; /* Window and OpenGL context */
523 SFG_WindowState State; /* The window state */
524 void *CallBacks[ TOTAL_CALLBACKS ]; /* Array of window callbacks */
525 void *UserData ; /* For use by user */
527 SFG_Menu* Menu[ FREEGLUT_MAX_MENUS ]; /* Menus appended to window */
528 SFG_Menu* ActiveMenu; /* The window's active menu */
530 SFG_Window* Parent; /* The parent to this window */
531 SFG_List Children; /* The subwindows d.l. list */
533 GLboolean IsMenu; /* Set to 1 if we are a menu */
537 /* A linked list structure of windows */
538 typedef struct tagSFG_WindowList SFG_WindowList ;
539 struct tagSFG_WindowList
545 /* This holds information about all the windows, menus etc. */
546 typedef struct tagSFG_Structure SFG_Structure;
547 struct tagSFG_Structure
549 SFG_List Windows; /* The global windows list */
550 SFG_List Menus; /* The global menus list */
551 SFG_List WindowsToDestroy;
553 SFG_Window* Window; /* The currently active win. */
554 SFG_Menu* Menu; /* Same, but menu... */
556 SFG_MenuContext* MenuContext; /* OpenGL rendering context for menus */
558 SFG_Window* GameMode; /* The game mode window */
560 int WindowID; /* The new current window ID */
561 int MenuID; /* The new current menu ID */
565 * This structure is used for the enumeration purposes.
566 * You can easily extend its functionalities by declaring
567 * a structure containing enumerator's contents and custom
568 * data, then casting its pointer to (SFG_Enumerator *).
570 typedef struct tagSFG_Enumerator SFG_Enumerator;
571 struct tagSFG_Enumerator
573 GLboolean found; /* Used to terminate search */
574 void* data; /* Custom data pointer */
576 typedef void (* FGCBenumerator )( SFG_Window *, SFG_Enumerator * );
578 /* The bitmap font structure */
579 typedef struct tagSFG_Font SFG_Font;
582 char* Name; /* The source font name */
583 int Quantity; /* Number of chars in font */
584 int Height; /* Height of the characters */
585 const GLubyte** Characters; /* The characters mapping */
587 float xorig, yorig; /* Relative origin of the character */
590 /* The stroke font structures */
592 typedef struct tagSFG_StrokeVertex SFG_StrokeVertex;
593 struct tagSFG_StrokeVertex
598 typedef struct tagSFG_StrokeStrip SFG_StrokeStrip;
599 struct tagSFG_StrokeStrip
602 const SFG_StrokeVertex* Vertices;
605 typedef struct tagSFG_StrokeChar SFG_StrokeChar;
606 struct tagSFG_StrokeChar
610 const SFG_StrokeStrip* Strips;
613 typedef struct tagSFG_StrokeFont SFG_StrokeFont;
614 struct tagSFG_StrokeFont
616 char* Name; /* The source font name */
617 int Quantity; /* Number of chars in font */
618 GLfloat Height; /* Height of the characters */
619 const SFG_StrokeChar** Characters; /* The characters mapping */
622 /* -- GLOBAL VARIABLES EXPORTS --------------------------------------------- */
624 /* Freeglut display related stuff (initialized once per session) */
625 extern SFG_Display fgDisplay;
627 /* Freeglut internal structure */
628 extern SFG_Structure fgStructure;
630 /* The current freeglut settings */
631 extern SFG_State fgState;
634 /* -- PRIVATE FUNCTION DECLARATIONS ---------------------------------------- */
637 * A call to this function makes us sure that the Display and Structure
638 * subsystems have been properly initialized and are ready to be used
640 #define FREEGLUT_EXIT_IF_NOT_INITIALISED( string ) \
641 if ( ! fgState.Initialised ) \
643 fgError ( " ERROR: Function <%s> called" \
644 " without first calling 'glutInit'.", (string) ) ; \
647 #define FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED( string ) \
648 if ( ! fgState.Initialised ) \
650 fgError ( " ERROR: Internal <%s> function called" \
651 " without first calling 'glutInit'.", (string) ) ; \
654 #define FREEGLUT_INTERNAL_ERROR_EXIT( cond, string, function ) \
657 fgError ( " ERROR: Internal error <%s> in function %s", \
658 (string), (function) ) ; \
662 * Following definitions are somewhat similiar to GLib's,
663 * but do not generate any log messages:
665 #define freeglut_return_if_fail( expr ) \
668 #define freeglut_return_val_if_fail( expr, val ) \
673 * A call to those macros assures us that there is a current
674 * window set, respectively:
676 #define FREEGLUT_EXIT_IF_NO_WINDOW( string ) \
677 if ( ! fgStructure.Window ) \
679 fgError ( " ERROR: Function <%s> called" \
680 " with no current window defined.", (string) ) ; \
684 * The deinitialize function gets called on glutMainLoop() end. It should clean up
685 * everything inside of the freeglut
687 void fgDeinitialize( void );
690 * Those two functions are used to create/destroy the freeglut internal
691 * structures. This actually happens when calling glutInit() and when
692 * quitting the glutMainLoop() (which actually happens, when all windows
695 void fgCreateStructure( void );
696 void fgDestroyStructure( void );
698 /* A helper function to check if a display mode is possible to use */
699 #if TARGET_HOST_UNIX_X11
700 XVisualInfo* fgChooseVisual( void );
703 /* The window procedure for Win32 events handling */
704 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
705 LRESULT CALLBACK fgWindowProc( HWND hWnd, UINT uMsg,
706 WPARAM wParam, LPARAM lParam );
707 GLboolean fgSetupPixelFormat( SFG_Window* window, GLboolean checkOnly,
708 unsigned char layer_type );
712 * Window creation, opening, closing and destruction.
713 * Also CallBack clearing/initialization.
714 * Defined in freeglut_structure.c, freeglut_window.c.
716 SFG_Window* fgCreateWindow( SFG_Window* parent, const char* title,
717 int x, int y, int w, int h,
718 GLboolean gameMode, GLboolean isMenu );
719 void fgSetWindow ( SFG_Window *window );
720 void fgOpenWindow( SFG_Window* window, const char* title,
721 int x, int y, int w, int h, GLboolean gameMode,
722 GLboolean isSubWindow );
723 void fgCloseWindow( SFG_Window* window );
724 void fgAddToWindowDestroyList ( SFG_Window* window );
725 void fgCloseWindows ();
726 void fgDestroyWindow( SFG_Window* window );
728 /* Menu creation and destruction. Defined in freeglut_structure.c */
729 SFG_Menu* fgCreateMenu( FGCBMenu menuCallback );
730 void fgDestroyMenu( SFG_Menu* menu );
732 /* Joystick device management functions, defined in freeglut_joystick.c */
733 int fgJoystickDetect( void );
734 void fgInitialiseJoysticks( void );
735 void fgJoystickClose( void );
736 void fgJoystickPollWindow( SFG_Window* window );
738 /* More joystick functions. Should these go into the API? */
739 int glutJoystickGetNumAxes( int ident );
740 int glutJoystickGetNumButtons( int ident );
741 int glutJoystickNotWorking( int ident );
744 * Helper function to enumerate through all registered windows
745 * and one to enumerate all of a window's subwindows...
747 * The GFunc callback for those functions will be defined as:
749 * void enumCallback( gpointer window, gpointer enumerator );
751 * where window is the enumerated (sub)window pointer (SFG_Window *),
752 * and userData is the a custom user-supplied pointer. Functions
753 * are defined and exported from freeglut_structure.c file.
755 void fgEnumWindows( FGCBenumerator enumCallback, SFG_Enumerator* enumerator );
756 void fgEnumSubWindows( SFG_Window* window, FGCBenumerator enumCallback,
757 SFG_Enumerator* enumerator );
760 * fgWindowByHandle returns a (SFG_Window *) value pointing to the
761 * first window in the queue matching the specified window handle.
762 * The function is defined in freeglut_structure.c file.
764 SFG_Window* fgWindowByHandle( SFG_WindowHandleType hWindow );
767 * This function is similiar to the previous one, except it is
768 * looking for a specified (sub)window identifier. The function
769 * is defined in freeglut_structure.c file.
771 SFG_Window* fgWindowByID( int windowID );
774 * Looks up a menu given its ID. This is easier than fgWindowByXXX
775 * as all menus are placed in a single doubly linked list...
777 SFG_Menu* fgMenuByID( int menuID );
780 * The menu activation and deactivation the code. This is the meat
781 * of the menu user interface handling code...
783 void fgActivateMenu( SFG_Window* window, int button );
784 GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
785 int mouse_x, int mouse_y );
786 void fgDeactivateMenu( SFG_Window *window );
787 void fgDeactivateSubMenu( SFG_MenuEntry *menuEntry );
790 * This function gets called just before the buffers swap, so that
791 * freeglut can display the pull-down menus via OpenGL. The function
792 * is defined in freeglut_menu.c file.
794 void fgDisplayMenu( void );
797 * Display the mouse cursor using OpenGL calls. The function
798 * is defined in freeglut_cursor.c file.
800 void fgDisplayCursor( void );
802 /* Elapsed time as per glutGet(GLUT_ELAPSED_TIME). */
803 long fgElapsedTime( void );
806 void fgListInit(SFG_List *list);
807 void fgListAppend(SFG_List *list, SFG_Node *node);
808 void fgListRemove(SFG_List *list, SFG_Node *node);
809 int fgListLength(SFG_List *list);
810 void fgListInsert(SFG_List *list, SFG_Node *next, SFG_Node *node);
812 /* Error Message functions */
813 void fgError( const char *fmt, ... );
814 void fgWarning( const char *fmt, ... );
816 #endif /* FREEGLUT_INTERNAL_H */
818 /*** END OF FILE ***/