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 # include <sys/types.h>
82 #if TIME_WITH_SYS_TIME
83 # include <sys/time.h>
87 # include <sys/time.h>
93 /* The system-dependant include files should go here: */
94 #if TARGET_HOST_UNIX_X11
97 #include <X11/Xatom.h>
98 #include <X11/keysym.h>
100 #ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
101 #include <X11/extensions/xf86vmode.h>
105 /* Microsoft VisualC++ 5.0's <math.h> does not define the PI */
107 # define M_PI 3.14159265358979323846
118 /* -- GLOBAL TYPE DEFINITIONS ---------------------------------------------- */
120 /* Freeglut callbacks type definitions */
121 typedef void (* FGCBDisplay )( void );
122 typedef void (* FGCBReshape )( int, int );
123 typedef void (* FGCBVisibility )( int );
124 typedef void (* FGCBKeyboard )( unsigned char, int, int );
125 typedef void (* FGCBSpecial )( int, int, int );
126 typedef void (* FGCBMouse )( int, int, int, int );
127 typedef void (* FGCBMouseWheel )( int, int, int, int );
128 typedef void (* FGCBMotion )( int, int );
129 typedef void (* FGCBPassive )( int, int );
130 typedef void (* FGCBEntry )( int );
131 typedef void (* FGCBWindowStatus )( int );
132 typedef void (* FGCBSelect )( int, int, int );
133 typedef void (* FGCBJoystick )( unsigned int, int, int, int );
134 typedef void (* FGCBKeyboardUp )( unsigned char, int, int );
135 typedef void (* FGCBSpecialUp )( int, int, int );
136 typedef void (* FGCBOverlayDisplay)( void );
137 typedef void (* FGCBSpaceMotion )( int, int, int );
138 typedef void (* FGCBSpaceRotation )( int, int, int );
139 typedef void (* FGCBSpaceButton )( int, int );
140 typedef void (* FGCBDials )( int, int );
141 typedef void (* FGCBButtonBox )( int, int );
142 typedef void (* FGCBTabletMotion )( int, int );
143 typedef void (* FGCBTabletButton )( int, int, int, int );
144 typedef void (* FGCBDestroy )( void );
146 /* The global callbacks type definitions */
147 typedef void (* FGCBIdle )( void );
148 typedef void (* FGCBTimer )( int );
149 typedef void (* FGCBMenuState )( int );
150 typedef void (* FGCBMenuStatus )( int, int, int );
152 /* The callback used when creating/using menus */
153 typedef void (* FGCBMenu )( int );
156 /* A list structure */
157 typedef struct tagSFG_List SFG_List;
164 /* A list node structure */
165 typedef struct tagSFG_Node SFG_Node;
172 /* A helper structure holding two ints and a boolean */
173 typedef struct tagSFG_XYUse SFG_XYUse;
176 GLint X, Y; /* The two integers... */
177 GLboolean Use; /* ...and a single boolean. */
180 /* A helper structure holding a timeval and a boolean */
181 typedef struct tagSFG_Time SFG_Time;
184 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
187 struct timeval Value;
193 * An enumeration containing the state of the GLUT execution:
194 * initializing, running, or stopping
198 GLUT_EXEC_STATE_INIT,
199 GLUT_EXEC_STATE_RUNNING,
203 /* This structure holds different freeglut settings */
204 typedef struct tagSFG_State SFG_State;
207 SFG_XYUse Position; /* The default windows' position */
208 SFG_XYUse Size; /* The default windows' size */
209 unsigned int DisplayMode; /* Display mode for new windows */
211 GLboolean Initialised; /* freeglut has been initialised */
213 int DirectContext; /* Direct rendering state */
215 GLboolean ForceIconic; /* New top windows are iconified */
216 GLboolean UseCurrentContext; /* New windows share with current */
218 GLboolean GLDebugSwitch; /* OpenGL state debugging switch */
219 GLboolean XSyncSwitch; /* X11 sync protocol switch */
221 int KeyRepeat; /* Global key repeat mode. */
222 int Modifiers; /* Current ALT/SHIFT/CTRL state */
224 GLuint FPSInterval; /* Interval between FPS printfs */
225 GLuint SwapCount; /* Count of glutSwapBuffer calls */
226 GLuint SwapTime; /* Time of last SwapBuffers */
228 SFG_Time Time; /* Time that glutInit was called */
229 SFG_List Timers; /* The freeglut timer hooks */
230 SFG_List FreeTimers; /* The unused timer hooks */
232 FGCBIdle IdleCallback; /* The global idle callback */
234 int ActiveMenus; /* Num. of currently active menus */
235 FGCBMenuState MenuStateCallback; /* Menu callbacks are global */
236 FGCBMenuStatus MenuStatusCallback;
238 SFG_XYUse GameModeSize; /* Game mode screen's dimensions */
239 int GameModeDepth; /* The pixel depth for game mode */
240 int GameModeRefresh; /* The refresh rate for game mode */
242 int ActionOnWindowClose; /* Action when user closes window */
244 fgExecutionState ExecState; /* Used for GLUT termination */
245 char *ProgramName; /* Name of the invoking program */
246 GLboolean JoysticksInitialised; /* Only initialize if application calls for them */
249 /* The structure used by display initialization in freeglut_init.c */
250 typedef struct tagSFG_Display SFG_Display;
251 struct tagSFG_Display
253 #if TARGET_HOST_UNIX_X11
254 Display* Display; /* The display we are being run in. */
255 int Screen; /* The screen we are about to use. */
256 Window RootWindow; /* The screen's root window. */
257 int Connection; /* The display's connection number */
258 Atom DeleteWindow; /* The window deletion atom */
260 #ifdef X_XF86VidModeGetModeLine
262 * XF86VidMode may be compilable even if it fails at runtime. Therefore,
263 * the validity of the VidMode has to be tracked
265 int DisplayModeValid; /* Flag that indicates runtime status*/
266 XF86VidModeModeLine DisplayMode; /* Current screen's display settings */
267 int DisplayModeClock; /* The display mode's refresh rate */
268 int DisplayViewPortX; /* saved X location of the viewport */
269 int DisplayViewPortY; /* saved Y location of the viewport */
270 int DisplayPointerX; /* saved X location of the pointer */
271 int DisplayPointerY; /* saved Y location of the pointer */
275 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
276 HINSTANCE Instance; /* The application's instance */
277 DEVMODE DisplayMode; /* Desktop's display settings */
281 int ScreenWidth; /* The screen's width in pixels */
282 int ScreenHeight; /* The screen's height in pixels */
283 int ScreenWidthMM; /* The screen's width in milimeters */
284 int ScreenHeightMM; /* The screen's height in milimeters */
288 /* The user can create any number of timer hooks */
289 typedef struct tagSFG_Timer SFG_Timer;
293 int ID; /* The timer ID integer */
294 FGCBTimer Callback; /* The timer callback */
295 long TriggerTime; /* The timer trigger time */
299 * Make "freeglut" window handle and context types so that we don't need so
300 * much conditionally-compiled code later in the library.
302 #if TARGET_HOST_UNIX_X11
304 typedef Window SFG_WindowHandleType ;
305 typedef GLXContext SFG_WindowContextType ;
307 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
309 typedef HWND SFG_WindowHandleType ;
310 typedef HGLRC SFG_WindowContextType ;
315 * A window and its OpenGL context. The contents of this structure
316 * are highly dependant on the target operating system we aim at...
318 typedef struct tagSFG_Context SFG_Context;
319 struct tagSFG_Context
321 SFG_WindowHandleType Handle; /* The window's handle */
322 SFG_WindowContextType Context; /* The window's OpenGL/WGL context */
324 #if TARGET_HOST_UNIX_X11
325 XVisualInfo* VisualInfo; /* The window's visual information */
326 #elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
327 HDC Device; /* The window's device context */
330 int DoubleBuffered; /* Treat the window as double-buffered */
333 /* Window's state description. This structure should be kept portable. */
334 typedef struct tagSFG_WindowState SFG_WindowState;
335 struct tagSFG_WindowState
337 int Width; /* Window's width in pixels */
338 int Height; /* The same about the height */
339 int OldWidth; /* Window width from before a resize */
340 int OldHeight; /* " height " " " " */
342 GLboolean Redisplay; /* Do we have to redisplay? */
343 GLboolean Visible; /* Is the window visible now */
345 int Cursor; /* The currently selected cursor */
347 long JoystickPollRate; /* The joystick polling rate */
348 long JoystickLastPoll; /* When the last poll happened */
350 int MouseX, MouseY; /* The most recent mouse position */
352 GLboolean IgnoreKeyRepeat; /* Whether to ignore key repeat. */
353 GLboolean KeyRepeating; /* Currently in repeat mode */
355 GLboolean IsGameMode; /* Is this the game mode window? */
356 GLboolean NeedToResize; /* Do we need to resize the window? */
361 * A generic function pointer. We should really use the GLUTproc type
362 * defined in freeglut_ext.h, but if we include that header in this file
363 * a bunch of other stuff (font-related) blows up!
365 typedef void (*SFG_Proc)();
369 * SET_WCB() is used as:
371 * SET_WCB( window, cbname, func );
373 * ...where {window} is the freeglut window to set the callback,
374 * {cbname} is the window-specific callback to set,
375 * {func} is a function-pointer.
377 * Originally, {FETCH_WCB( ... ) = func} was rather sloppily used,
378 * but this can cause warnings because the FETCH_WCB() macro type-
379 * casts its result, and a type-cast value shouldn't be an lvalue.
381 * The {if( FETCH_WCB( ... ) != func )} test is to do type-checking
382 * and for no other reason. Since it's hidden in the macro, the
383 * ugliness is felt to be rather benign.
385 #define SET_WCB(window,cbname,func) \
388 if( FETCH_WCB( window, cbname ) != (SFG_Proc)(func) ) \
389 (((window).CallBacks[CB_ ## cbname]) = (SFG_Proc)(func)); \
393 * FETCH_WCB() is used as:
395 * FETCH_WCB( window, cbname );
397 * ...where {window} is the freeglut window to fetch the callback from,
398 * {cbname} is the window-specific callback to fetch.
400 * The result is correctly type-cast to the callback function pointer
403 #define FETCH_WCB(window,cbname) \
404 ((window).CallBacks[CB_ ## cbname])
407 * INVOKE_WCB() is used as:
409 * INVOKE_WCB( window, cbname, ( arg_list ) );
411 * ...where {window} is the freeglut window,
412 * {cbname} is the window-specific callback to be invoked,
413 * {(arg_list)} is the parameter list.
415 * The callback is invoked as:
417 * callback( arg_list );
419 * ...so the parentheses are REQUIRED in the {arg_list}.
421 * NOTE that it does a sanity-check and also sets the
425 #if TARGET_HOST_WIN32
426 #define INVOKE_WCB(window,cbname,arg_list) \
429 if( FETCH_WCB( window, cbname ) ) \
431 FGCB ## cbname func = (FGCB ## cbname)(FETCH_WCB( window, cbname )); \
432 fgSetWindow( &window ); \
437 #define INVOKE_WCB(window,cbname,arg_list) \
440 if( FETCH_WCB( window, cbname ) ) \
442 fgSetWindow( &window ); \
443 ((FGCB ## cbname)FETCH_WCB( window, cbname )) arg_list; \
449 * The window callbacks the user can supply us with. Should be kept portable.
451 * This enumeration provides the freeglut CallBack numbers.
452 * The symbolic constants are indices into a window's array of
453 * function callbacks. The names are formed by splicing a common
454 * prefix onto the callback's base name. (This was originally
455 * done so that an early stage of development could live side-by-
456 * side with the old callback code. The old callback code used
457 * the bare callback's name as a structure member, so I used a
458 * prefix for the array index name.)
460 * XXX For consistancy, perhaps the prefix should match the
461 * XXX FETCH* and INVOKE* macro suffices. I.e., WCB_, rather than
482 /* Presently ignored */
493 /* Always make this the LAST one */
498 /* This structure holds the OpenGL rendering context for all the menu windows */
499 typedef struct tagSFG_MenuContext SFG_MenuContext;
500 struct tagSFG_MenuContext
502 #if TARGET_HOST_UNIX_X11
503 XVisualInfo* VisualInfo; /* The window's visual information */
506 SFG_WindowContextType Context; /* The menu window's WGL context */
509 /* This structure describes a menu */
510 typedef struct tagSFG_Window SFG_Window;
511 typedef struct tagSFG_MenuEntry SFG_MenuEntry;
512 typedef struct tagSFG_Menu SFG_Menu;
516 void *UserData; /* User data passed back at callback */
517 int ID; /* The global menu ID */
518 SFG_List Entries; /* The menu entries list */
519 FGCBMenu Callback; /* The menu callback */
520 FGCBDestroy Destroy; /* Destruction callback */
521 GLboolean IsActive; /* Is the menu selected? */
522 int Width; /* Menu box width in pixels */
523 int Height; /* Menu box height in pixels */
524 int X, Y; /* Menu box raster position */
526 SFG_MenuEntry *ActiveEntry; /* Currently active entry in the menu */
527 SFG_Window *Window; /* Window for menu */
528 SFG_Window *ParentWindow; /* Window in which the menu is invoked */
531 /* This is a menu entry */
532 struct tagSFG_MenuEntry
535 int ID; /* The menu entry ID (local) */
536 int Ordinal; /* The menu's ordinal number */
537 char* Text; /* The text to be displayed */
538 SFG_Menu* SubMenu; /* Optional sub-menu tree */
539 GLboolean IsActive; /* Is the entry highlighted? */
540 int Width; /* Label's width in pixels */
544 * A window, making part of freeglut windows hierarchy.
545 * Should be kept portable.
547 * NOTE that ActiveMenu is set to menu itself if the window is a menu.
552 int ID; /* Window's ID number */
554 SFG_Context Window; /* Window and OpenGL context */
555 SFG_WindowState State; /* The window state */
556 SFG_Proc CallBacks[ TOTAL_CALLBACKS ]; /* Array of window callbacks */
557 void *UserData ; /* For use by user */
559 SFG_Menu* Menu[ FREEGLUT_MAX_MENUS ]; /* Menus appended to window */
560 SFG_Menu* ActiveMenu; /* The window's active menu */
562 SFG_Window* Parent; /* The parent to this window */
563 SFG_List Children; /* The subwindows d.l. list */
565 GLboolean IsMenu; /* Set to 1 if we are a menu */
569 /* A linked list structure of windows */
570 typedef struct tagSFG_WindowList SFG_WindowList ;
571 struct tagSFG_WindowList
577 /* This holds information about all the windows, menus etc. */
578 typedef struct tagSFG_Structure SFG_Structure;
579 struct tagSFG_Structure
581 SFG_List Windows; /* The global windows list */
582 SFG_List Menus; /* The global menus list */
583 SFG_List WindowsToDestroy;
585 SFG_Window* CurrentWindow; /* The currently set window */
586 SFG_Menu* CurrentMenu; /* Same, but menu... */
588 SFG_MenuContext* MenuContext; /* OpenGL rendering context for menus */
590 SFG_Window* GameMode; /* The game mode window */
592 int WindowID; /* The new current window ID */
593 int MenuID; /* The new current menu ID */
597 * This structure is used for the enumeration purposes.
598 * You can easily extend its functionalities by declaring
599 * a structure containing enumerator's contents and custom
600 * data, then casting its pointer to (SFG_Enumerator *).
602 typedef struct tagSFG_Enumerator SFG_Enumerator;
603 struct tagSFG_Enumerator
605 GLboolean found; /* Used to terminate search */
606 void* data; /* Custom data pointer */
608 typedef void (* FGCBenumerator )( SFG_Window *, SFG_Enumerator * );
610 /* The bitmap font structure */
611 typedef struct tagSFG_Font SFG_Font;
614 char* Name; /* The source font name */
615 int Quantity; /* Number of chars in font */
616 int Height; /* Height of the characters */
617 const GLubyte** Characters; /* The characters mapping */
619 float xorig, yorig; /* Relative origin of the character */
622 /* The stroke font structures */
624 typedef struct tagSFG_StrokeVertex SFG_StrokeVertex;
625 struct tagSFG_StrokeVertex
630 typedef struct tagSFG_StrokeStrip SFG_StrokeStrip;
631 struct tagSFG_StrokeStrip
634 const SFG_StrokeVertex* Vertices;
637 typedef struct tagSFG_StrokeChar SFG_StrokeChar;
638 struct tagSFG_StrokeChar
642 const SFG_StrokeStrip* Strips;
645 typedef struct tagSFG_StrokeFont SFG_StrokeFont;
646 struct tagSFG_StrokeFont
648 char* Name; /* The source font name */
649 int Quantity; /* Number of chars in font */
650 GLfloat Height; /* Height of the characters */
651 const SFG_StrokeChar** Characters; /* The characters mapping */
654 /* -- GLOBAL VARIABLES EXPORTS --------------------------------------------- */
656 /* Freeglut display related stuff (initialized once per session) */
657 extern SFG_Display fgDisplay;
659 /* Freeglut internal structure */
660 extern SFG_Structure fgStructure;
662 /* The current freeglut settings */
663 extern SFG_State fgState;
666 /* -- PRIVATE FUNCTION DECLARATIONS ---------------------------------------- */
669 * A call to this function makes us sure that the Display and Structure
670 * subsystems have been properly initialized and are ready to be used
672 #define FREEGLUT_EXIT_IF_NOT_INITIALISED( string ) \
673 if ( ! fgState.Initialised ) \
675 fgError ( " ERROR: Function <%s> called" \
676 " without first calling 'glutInit'.", (string) ) ; \
679 #define FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED( string ) \
680 if ( ! fgState.Initialised ) \
682 fgError ( " ERROR: Internal <%s> function called" \
683 " without first calling 'glutInit'.", (string) ) ; \
686 #define FREEGLUT_INTERNAL_ERROR_EXIT( cond, string, function ) \
689 fgError ( " ERROR: Internal error <%s> in function %s", \
690 (string), (function) ) ; \
694 * Following definitions are somewhat similiar to GLib's,
695 * but do not generate any log messages:
697 #define freeglut_return_if_fail( expr ) \
700 #define freeglut_return_val_if_fail( expr, val ) \
705 * A call to those macros assures us that there is a current
706 * window set, respectively:
708 #define FREEGLUT_EXIT_IF_NO_WINDOW( string ) \
709 if ( ! fgStructure.CurrentWindow ) \
711 fgError ( " ERROR: Function <%s> called" \
712 " with no current window defined.", (string) ) ; \
716 * The deinitialize function gets called on glutMainLoop() end. It should clean up
717 * everything inside of the freeglut
719 void fgDeinitialize( void );
722 * Those two functions are used to create/destroy the freeglut internal
723 * structures. This actually happens when calling glutInit() and when
724 * quitting the glutMainLoop() (which actually happens, when all windows
727 void fgCreateStructure( void );
728 void fgDestroyStructure( void );
730 /* A helper function to check if a display mode is possible to use */
731 #if TARGET_HOST_UNIX_X11
732 XVisualInfo* fgChooseVisual( void );
735 /* The window procedure for Win32 events handling */
736 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
737 LRESULT CALLBACK fgWindowProc( HWND hWnd, UINT uMsg,
738 WPARAM wParam, LPARAM lParam );
739 GLboolean fgSetupPixelFormat( SFG_Window* window, GLboolean checkOnly,
740 unsigned char layer_type );
744 * Window creation, opening, closing and destruction.
745 * Also CallBack clearing/initialization.
746 * Defined in freeglut_structure.c, freeglut_window.c.
748 SFG_Window* fgCreateWindow( SFG_Window* parent, const char* title,
749 int x, int y, int w, int h,
750 GLboolean gameMode, GLboolean isMenu );
751 void fgSetWindow ( SFG_Window *window );
752 void fgOpenWindow( SFG_Window* window, const char* title,
753 int x, int y, int w, int h, GLboolean gameMode,
754 GLboolean isSubWindow );
755 void fgCloseWindow( SFG_Window* window );
756 void fgAddToWindowDestroyList ( SFG_Window* window );
757 void fgCloseWindows ();
758 void fgDestroyWindow( SFG_Window* window );
760 /* Menu creation and destruction. Defined in freeglut_structure.c */
761 SFG_Menu* fgCreateMenu( FGCBMenu menuCallback );
762 void fgDestroyMenu( SFG_Menu* menu );
764 /* Joystick device management functions, defined in freeglut_joystick.c */
765 int fgJoystickDetect( void );
766 void fgInitialiseJoysticks( void );
767 void fgJoystickClose( void );
768 void fgJoystickPollWindow( SFG_Window* window );
770 /* More joystick functions. Should these go into the API? */
771 int glutJoystickGetNumAxes( int ident );
772 int glutJoystickGetNumButtons( int ident );
773 int glutJoystickNotWorking( int ident );
775 /* Setting the cursor for a given window */
776 void fgSetCursor ( SFG_Window *window, int cursorID );
779 * Helper function to enumerate through all registered windows
780 * and one to enumerate all of a window's subwindows...
782 * The GFunc callback for those functions will be defined as:
784 * void enumCallback( gpointer window, gpointer enumerator );
786 * where window is the enumerated (sub)window pointer (SFG_Window *),
787 * and userData is the a custom user-supplied pointer. Functions
788 * are defined and exported from freeglut_structure.c file.
790 void fgEnumWindows( FGCBenumerator enumCallback, SFG_Enumerator* enumerator );
791 void fgEnumSubWindows( SFG_Window* window, FGCBenumerator enumCallback,
792 SFG_Enumerator* enumerator );
795 * fgWindowByHandle returns a (SFG_Window *) value pointing to the
796 * first window in the queue matching the specified window handle.
797 * The function is defined in freeglut_structure.c file.
799 SFG_Window* fgWindowByHandle( SFG_WindowHandleType hWindow );
802 * This function is similiar to the previous one, except it is
803 * looking for a specified (sub)window identifier. The function
804 * is defined in freeglut_structure.c file.
806 SFG_Window* fgWindowByID( int windowID );
809 * Looks up a menu given its ID. This is easier than fgWindowByXXX
810 * as all menus are placed in a single doubly linked list...
812 SFG_Menu* fgMenuByID( int menuID );
815 * The menu activation and deactivation the code. This is the meat
816 * of the menu user interface handling code...
818 void fgUpdateMenuHighlight ( SFG_Menu *menu );
819 GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
820 int mouse_x, int mouse_y );
821 void fgDeactivateMenu( SFG_Window *window );
824 * This function gets called just before the buffers swap, so that
825 * freeglut can display the pull-down menus via OpenGL. The function
826 * is defined in freeglut_menu.c file.
828 void fgDisplayMenu( void );
830 /* Elapsed time as per glutGet(GLUT_ELAPSED_TIME). */
831 long fgElapsedTime( void );
834 void fgListInit(SFG_List *list);
835 void fgListAppend(SFG_List *list, SFG_Node *node);
836 void fgListRemove(SFG_List *list, SFG_Node *node);
837 int fgListLength(SFG_List *list);
838 void fgListInsert(SFG_List *list, SFG_Node *next, SFG_Node *node);
840 /* Error Message functions */
841 void fgError( const char *fmt, ... );
842 void fgWarning( const char *fmt, ... );
844 #endif /* FREEGLUT_INTERNAL_H */
846 /*** END OF FILE ***/