--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/fg_internal.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,1082 @@
+/*
+ * fg_internal.h
+ *
+ * The freeglut library private include file.
+ *
+ * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
+ * Written by Pawel W. Olszta, <olszta@sourceforge.net>
+ * Creation date: Thu Dec 2 1999
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef  FREEGLUT_INTERNAL_H
+#define  FREEGLUT_INTERNAL_H
+
+#ifdef HAVE_CONFIG_H
+#    include "config.h"
+#endif
+
+#include "fg_version.h"
+
+/* Freeglut is intended to function under all Unix/X11 and Win32 platforms. */
+/* XXX: Don't all MS-Windows compilers (except Cygwin) have _WIN32 defined?
+ * XXX: If so, remove the first set of defined()'s below.
+ */
+#if !defined(TARGET_HOST_POSIX_X11) && !defined(TARGET_HOST_MS_WINDOWS) && !defined(TARGET_HOST_MAC_OSX) && !defined(TARGET_HOST_SOLARIS)
+#if defined(_MSC_VER) || defined(__WATCOMC__) || defined(__MINGW32__) \
+    || defined(_WIN32) || defined(_WIN32_WCE) \
+    || ( defined(__CYGWIN__) && defined(X_DISPLAY_MISSING) )
+#   define  TARGET_HOST_MS_WINDOWS 1
+
+#elif defined (__ANDROID__)
+#   define  TARGET_HOST_ANDROID  1
+
+#elif defined (__QNXNTO__) || defined (__PLAYBOOK__)
+#   define  TARGET_HOST_BLACKBERRY  1
+
+#elif defined(__posix__) || defined(__unix__) || defined(__linux__) || defined(__sun)
+#   define  TARGET_HOST_POSIX_X11  1
+
+#elif defined(__APPLE__)
+/* This is a placeholder until we get native OSX support ironed out -- JFF 11/18/09 */
+#   define  TARGET_HOST_POSIX_X11  1
+/* #   define  TARGET_HOST_MAC_OSX    1 */
+
+#else
+#   error "Unrecognized target host!"
+
+#endif
+#endif
+
+/* Detect both SunPro and gcc compilers on Sun Solaris */
+#if defined (__SVR4) && defined (__sun)
+#   define TARGET_HOST_SOLARIS 1
+#endif
+
+#ifndef TARGET_HOST_MS_WINDOWS
+#   define  TARGET_HOST_MS_WINDOWS 0
+#endif
+
+#ifndef TARGET_HOST_ANDROID
+#   define  TARGET_HOST_ANDROID    0
+#endif
+
+#ifndef TARGET_HOST_BLACKBERRY
+#   define  TARGET_HOST_BLACKBERRY 0
+#endif
+
+#ifndef  TARGET_HOST_POSIX_X11
+#   define  TARGET_HOST_POSIX_X11  0
+#endif
+
+#ifndef  TARGET_HOST_MAC_OSX
+#   define  TARGET_HOST_MAC_OSX    0
+#endif
+
+#ifndef  TARGET_HOST_SOLARIS
+#   define  TARGET_HOST_SOLARIS    0
+#endif
+
+/* -- FIXED CONFIGURATION LIMITS ------------------------------------------- */
+
+#define  FREEGLUT_MAX_MENUS         3
+
+/* These files should be available on every platform. */
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+/* These are included based on autoconf directives. */
+#ifdef HAVE_SYS_TYPES_H
+#    include <sys/types.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#    include <unistd.h>
+#endif
+#ifdef TIME_WITH_SYS_TIME
+#    include <sys/time.h>
+#    include <time.h>
+#elif defined(HAVE_SYS_TIME_H)
+#    include <sys/time.h>
+#else
+#    include <time.h>
+#endif
+
+/* -- AUTOCONF HACKS --------------------------------------------------------*/
+
+/* XXX: Update autoconf to avoid these.
+ * XXX: Are non-POSIX platforms intended not to use autoconf?
+ * If so, perhaps there should be a config_guess.h for them. Alternatively,
+ * config guesses could be placed above, just after the config.h exclusion.
+ */
+#if defined(__FreeBSD__) || defined(__NetBSD__)
+#    define HAVE_USB_JS 1
+#    if defined(__NetBSD__) || ( defined(__FreeBSD__) && __FreeBSD_version >= 500000)
+#        define HAVE_USBHID_H 1
+#    endif
+#endif
+
+#if defined(_MSC_VER) || defined(__WATCOMC__)
+/* strdup() is non-standard, for all but POSIX-2001 */
+#define strdup   _strdup
+#endif
+
+/* M_PI is non-standard (defined by BSD, not ISO-C) */
+#ifndef M_PI
+#    define  M_PI  3.14159265358979323846
+#endif
+
+#ifdef HAVE_STDBOOL_H
+#    include <stdbool.h>
+#    ifndef TRUE
+#        define TRUE true
+#    endif
+#    ifndef FALSE
+#        define FALSE false
+#    endif
+#else
+#    ifndef TRUE
+#        define  TRUE  1
+#    endif
+#    ifndef FALSE
+#        define  FALSE  0
+#    endif
+#endif
+
+/* General defines */
+#define INVALID_MODIFIERS 0xffffffff
+
+/* FreeGLUT internal time type */
+#if defined(HAVE_STDINT_H)
+#   include <stdint.h>
+    typedef uint64_t fg_time_t;
+#elif defined(HAVE_INTTYPES_H)
+#   include <inttypes.h>
+    typedef uint64_t fg_time_t;
+#elif defined(HAVE_U__INT64)
+    typedef unsigned __int64 fg_time_t;
+#elif defined(HAVE_ULONG_LONG)
+    typedef unsigned long long fg_time_t;
+#else
+    typedef unsigned long fg_time_t;
+#endif
+
+#ifndef __fg_unused
+# ifdef __GNUC__
+#  define __fg_unused __attribute__((unused))
+# else
+#  define __fg_unused
+# endif
+#endif
+
+/* Platform-specific includes */
+#if TARGET_HOST_POSIX_X11
+#include "x11/fg_internal_x11.h"
+#endif
+#if TARGET_HOST_MS_WINDOWS
+#include "mswin/fg_internal_mswin.h"
+#endif
+#if TARGET_HOST_ANDROID
+#include "android/fg_internal_android.h"
+#endif
+#if TARGET_HOST_BLACKBERRY
+#include "blackberry/fg_internal_blackberry.h"
+#endif
+
+
+/* -- GLOBAL TYPE DEFINITIONS ---------------------------------------------- */
+
+/* Freeglut callbacks type definitions */
+typedef void (* FGCBDisplay       )( void );
+typedef void (* FGCBReshape       )( int, int );
+typedef void (* FGCBPosition      )( int, int );
+typedef void (* FGCBVisibility    )( int );
+typedef void (* FGCBKeyboard      )( unsigned char, int, int );
+typedef void (* FGCBKeyboardExt   )( int, int, int );
+typedef void (* FGCBKeyboardDown  )( unsigned char, int, int );
+typedef void (* FGCBKeyboardUp    )( unsigned char, int, int );
+typedef void (* FGCBSpecial       )( int, int, int );
+typedef void (* FGCBSpecialUp     )( int, int, int );
+typedef void (* FGCBMouse         )( int, int, int, int );
+typedef void (* FGCBMouseWheel    )( int, int, int, int );
+typedef void (* FGCBMotion        )( int, int );
+typedef void (* FGCBPassive       )( int, int );
+typedef void (* FGCBEntry         )( int );
+typedef void (* FGCBWindowStatus  )( int );
+typedef void (* FGCBJoystick      )( unsigned int, int, int, int );
+typedef void (* FGCBOverlayDisplay)( void );
+typedef void (* FGCBSpaceMotion   )( int, int, int );
+typedef void (* FGCBSpaceRotation )( int, int, int );
+typedef void (* FGCBSpaceButton   )( int, int );
+typedef void (* FGCBDials         )( int, int );
+typedef void (* FGCBButtonBox     )( int, int );
+typedef void (* FGCBTabletMotion  )( int, int );
+typedef void (* FGCBTabletButton  )( int, int, int, int );
+typedef void (* FGCBDestroy       )( void );    /* Used for both window and menu destroy callbacks */
+
+typedef void (* FGCBMultiEntry   )( int, int );
+typedef void (* FGCBMultiButton  )( int, int, int, int, int );
+typedef void (* FGCBMultiMotion  )( int, int, int );
+typedef void (* FGCBMultiPassive )( int, int, int );
+
+typedef void (* FGCBInitContext)();
+typedef void (* FGCBAppStatus)(int);
+
+/* The global callbacks type definitions */
+typedef void (* FGCBIdle          )( void );
+typedef void (* FGCBTimer         )( int );
+typedef void (* FGCBMenuState     )( int );
+typedef void (* FGCBMenuStatus    )( int, int, int );
+
+/* The callback used when creating/using menus */
+typedef void (* FGCBMenu          )( int );
+
+/* The FreeGLUT error/warning handler type definition */
+typedef void (* FGError           ) ( const char *fmt, va_list ap);
+typedef void (* FGWarning         ) ( const char *fmt, va_list ap);
+
+
+/* A list structure */
+typedef struct tagSFG_List SFG_List;
+struct tagSFG_List
+{
+    void *First;
+    void *Last;
+};
+
+/* A list node structure */
+typedef struct tagSFG_Node SFG_Node;
+struct tagSFG_Node
+{
+    void *Next;
+    void *Prev;
+};
+
+/* A helper structure holding two ints and a boolean */
+typedef struct tagSFG_XYUse SFG_XYUse;
+struct tagSFG_XYUse
+{
+    GLint           X, Y;               /* The two integers...               */
+    GLboolean       Use;                /* ...and a single boolean.          */
+};
+
+/*
+ * An enumeration containing the state of the GLUT execution:
+ * initializing, running, or stopping
+ */
+typedef enum
+{
+  GLUT_EXEC_STATE_INIT,
+  GLUT_EXEC_STATE_RUNNING,
+  GLUT_EXEC_STATE_STOP
+} fgExecutionState ;
+
+/* This structure holds different freeglut settings */
+typedef struct tagSFG_State SFG_State;
+struct tagSFG_State
+{
+    SFG_XYUse        Position;             /* The default windows' position  */
+    SFG_XYUse        Size;                 /* The default windows' size      */
+    unsigned int     DisplayMode;          /* Display mode for new windows   */
+
+    GLboolean        Initialised;          /* freeglut has been initialised  */
+
+    int              DirectContext;        /* Direct rendering state         */
+
+    GLboolean        ForceIconic;          /* New top windows are iconified  */
+    GLboolean        UseCurrentContext;    /* New windows share with current */
+
+    GLboolean        GLDebugSwitch;        /* OpenGL state debugging switch  */
+    GLboolean        XSyncSwitch;          /* X11 sync protocol switch       */
+
+    int              KeyRepeat;            /* Global key repeat mode.        */
+    int              Modifiers;            /* Current ALT/SHIFT/CTRL state   */
+
+    GLuint           FPSInterval;          /* Interval between FPS printfs   */
+    GLuint           SwapCount;            /* Count of glutSwapBuffer calls  */
+    GLuint           SwapTime;             /* Time of last SwapBuffers       */
+
+    fg_time_t        Time;                 /* Time that glutInit was called  */
+    SFG_List         Timers;               /* The freeglut timer hooks       */
+    SFG_List         FreeTimers;           /* The unused timer hooks         */
+
+    FGCBIdle         IdleCallback;         /* The global idle callback       */
+
+    int              ActiveMenus;          /* Num. of currently active menus */
+    FGCBMenuState    MenuStateCallback;    /* Menu callbacks are global      */
+    FGCBMenuStatus   MenuStatusCallback;
+    void*            MenuFont;             /* Font to be used for newly created menus */
+
+    SFG_XYUse        GameModeSize;         /* Game mode screen's dimensions  */
+    int              GameModeDepth;        /* The pixel depth for game mode  */
+    int              GameModeRefresh;      /* The refresh rate for game mode */
+
+    int              ActionOnWindowClose; /* Action when user closes window  */
+
+    fgExecutionState ExecState;           /* Used for GLUT termination       */
+    char            *ProgramName;         /* Name of the invoking program    */
+    GLboolean        JoysticksInitialised;  /* Only initialize if application calls for them */
+    int              NumActiveJoysticks;    /* Number of active joysticks (callback defined and positive pollrate) -- if zero, don't poll joysticks */
+    GLboolean        InputDevsInitialised;  /* Only initialize if application calls for them */
+
+	int              MouseWheelTicks;      /* Number of ticks the mouse wheel has turned */
+
+    int              AuxiliaryBufferNumber;  /* Number of auxiliary buffers */
+    int              SampleNumber;         /*  Number of samples per pixel  */
+
+    GLboolean        SkipStaleMotion;      /* skip stale motion events */
+
+    GLboolean        StrokeFontDrawJoinDots;/* Draw dots between line segments of stroke fonts? */
+
+    int              MajorVersion;         /* Major OpenGL context version  */
+    int              MinorVersion;         /* Minor OpenGL context version  */
+    int              ContextFlags;         /* OpenGL context flags          */
+    int              ContextProfile;       /* OpenGL context profile        */
+    int              HasOpenGL20;          /* fgInitGL2 could find all OpenGL 2.0 functions */
+    FGError          ErrorFunc;            /* User defined error handler    */
+    FGWarning        WarningFunc;          /* User defined warning handler  */
+};
+
+/* The structure used by display initialization in fg_init.c */
+typedef struct tagSFG_Display SFG_Display;
+struct tagSFG_Display
+{
+	SFG_PlatformDisplay pDisplay;
+
+    int             ScreenWidth;        /* The screen's width in pixels      */
+    int             ScreenHeight;       /* The screen's height in pixels     */
+    int             ScreenWidthMM;      /* The screen's width in milimeters  */
+    int             ScreenHeightMM;     /* The screen's height in milimeters */
+};
+
+
+/* The user can create any number of timer hooks */
+typedef struct tagSFG_Timer SFG_Timer;
+struct tagSFG_Timer
+{
+    SFG_Node        Node;
+    int             ID;                 /* The timer ID integer              */
+    FGCBTimer       Callback;           /* The timer callback                */
+    fg_time_t       TriggerTime;        /* The timer trigger time            */
+};
+
+/*
+ * A window and its OpenGL context. The contents of this structure
+ * are highly dependent on the target operating system we aim at...
+ */
+typedef struct tagSFG_Context SFG_Context;
+struct tagSFG_Context
+{
+    SFG_WindowHandleType  Handle;    /* The window's handle                 */
+    SFG_WindowContextType Context;   /* The window's OpenGL/WGL context     */
+
+	SFG_PlatformContext pContext;    /* The window's FBConfig (X11) or device context (Windows) */
+
+    int             DoubleBuffered;  /* Treat the window as double-buffered */
+
+    /* When drawing geometry to vertex attribute buffers, user specifies
+     * the attribute indices for vertices, normals and/or texture coords
+     * to freeglut. Those are stored here
+     */
+    GLint           attribute_v_coord;
+    GLint           attribute_v_normal;
+    GLint           attribute_v_texture;
+};
+
+
+/*
+ * Bitmasks indicating the different kinds of
+ * actions that can be scheduled for a window.
+ */
+#define GLUT_INIT_WORK        (1<<0)
+#define GLUT_VISIBILITY_WORK  (1<<1)
+#define GLUT_POSITION_WORK    (1<<2)
+#define GLUT_SIZE_WORK        (1<<3)
+#define GLUT_ZORDER_WORK      (1<<4)
+#define GLUT_FULL_SCREEN_WORK (1<<5)
+#define GLUT_DISPLAY_WORK     (1<<6)
+
+/*
+ * An enumeration containing the state of the GLUT execution:
+ * initializing, running, or stopping
+ */
+typedef enum
+{
+  DesireHiddenState,
+  DesireIconicState,
+  DesireNormalState
+} fgDesiredVisibility ;
+
+/*
+ *  There is considerable confusion about the "right thing to
+ *  do" concerning window  size and position.  GLUT itself is
+ *  not consistent between Windows and UNIX/X11; since
+ *  platform independence is a virtue for "freeglut", we
+ *  decided to break with GLUT's behaviour.
+ *
+ *  Under UNIX/X11, it is apparently not possible to get the
+ *  window border sizes in order to subtract them off the
+ *  window's initial position until some time after the window
+ *  has been created.  Therefore we decided on the following
+ *  behaviour, both under Windows and under UNIX/X11:
+ *  - When you create a window with position (x,y) and size
+ *    (w,h), the upper left hand corner of the outside of the
+ *    window is at (x,y) and the size of the drawable area is
+ *    (w,h).
+ *  - When you query the size and position of the window--as
+ *    is happening here for Windows--"freeglut" will return
+ *    the size of the drawable area--the (w,h) that you
+ *    specified when you created the window--and the coordinates
+ *    of the upper left hand corner of the drawable area, i.e.
+ *    of the client rect--which is NOT the (x,y) you specified.
+ */
+typedef struct tagSFG_WindowState SFG_WindowState;
+struct tagSFG_WindowState   /* as per notes above, sizes always refer to the client area (thus without the window decorations) */
+{
+    /* window state - size, position, look */
+    int             Xpos;               /* Window's top-left of client area, X-coordinate */
+    int             Ypos;               /* Window's top-left of client area, Y-coordinate */
+    int             Width;              /* Window's width in pixels          */
+    int             Height;             /* The same about the height         */
+    GLboolean       Visible;            /* Is the window visible now? Not using fgVisibilityState as we only care if visible or not */
+    int             Cursor;             /* The currently selected cursor style */
+    GLboolean       IsFullscreen;       /* is the window fullscreen?         */
+
+    /* FreeGLUT operations are deferred, that is, window moving, resizing,
+     * Z-order changing, making full screen or not do not happen immediately
+     * upon the user's request, but only in the next iteration of the main
+     * loop, before the display callback is called. This allows multiple
+     * reshape, position, etc requests to be combined into one and is
+     * compatible with the way GLUT does things. Callbacks get triggered
+     * based on the feedback/messages/notifications from the window manager.
+     * Below here we define what work should be done, as well as the relevant
+     * parameters for this work.
+     */
+    unsigned int    WorkMask;           /* work (resize, etc) to be done on the window */
+    int             DesiredXpos;        /* desired X location */
+    int             DesiredYpos;        /* desired Y location */
+    int             DesiredWidth;       /* desired window width */
+    int             DesiredHeight;      /* desired window height */
+    int             DesiredZOrder;      /* desired window Z Order position */
+    fgDesiredVisibility DesiredVisibility;/* desired visibility (hidden, iconic, shown/normal) */
+
+	SFG_PlatformWindowState pWState;    /* Window width/height (X11) or rectangle/style (Windows) from before a resize, and other stuff only needed on specific platforms */
+
+    long            JoystickPollRate;   /* The joystick polling rate         */
+    fg_time_t       JoystickLastPoll;   /* When the last poll happened       */
+
+    int             MouseX, MouseY;     /* The most recent mouse position    */
+
+    GLboolean       IgnoreKeyRepeat;    /* Whether to ignore key repeat.     */
+
+    GLboolean       VisualizeNormals;   /* When drawing objects, draw vectors representing the normals as well? */
+};
+
+
+/*
+ * A generic function pointer.  We should really use the GLUTproc type
+ * defined in freeglut_ext.h, but if we include that header in this file
+ * a bunch of other stuff (font-related) blows up!
+ */
+typedef void (*SFG_Proc)();
+
+
+/*
+ * SET_WCB() is used as:
+ *
+ *     SET_WCB( window, cbname, func );
+ *
+ * ...where {window} is the freeglut window to set the callback,
+ *          {cbname} is the window-specific callback to set,
+ *          {func} is a function-pointer.
+ *
+ * Originally, {FETCH_WCB( ... ) = func} was rather sloppily used,
+ * but this can cause warnings because the FETCH_WCB() macro type-
+ * casts its result, and a type-cast value shouldn't be an lvalue.
+ *
+ * The {if( FETCH_WCB( ... ) != func )} test is to do type-checking
+ * and for no other reason.  Since it's hidden in the macro, the
+ * ugliness is felt to be rather benign.
+ */
+#define SET_WCB(window,cbname,func)                            \
+do                                                             \
+{                                                              \
+    if( FETCH_WCB( window, cbname ) != (SFG_Proc)(func) )      \
+        (((window).CallBacks[WCB_ ## cbname]) = (SFG_Proc)(func)); \
+} while( 0 )
+
+/*
+ * FETCH_WCB() is used as:
+ *
+ *     FETCH_WCB( window, cbname );
+ *
+ * ...where {window} is the freeglut window to fetch the callback from,
+ *          {cbname} is the window-specific callback to fetch.
+ *
+ * The result is correctly type-cast to the callback function pointer
+ * type.
+ */
+#define FETCH_WCB(window,cbname) \
+    ((window).CallBacks[WCB_ ## cbname])
+
+/*
+ * INVOKE_WCB() is used as:
+ *
+ *     INVOKE_WCB( window, cbname, ( arg_list ) );
+ *
+ * ...where {window} is the freeglut window,
+ *          {cbname} is the window-specific callback to be invoked,
+ *          {(arg_list)} is the parameter list.
+ *
+ * The callback is invoked as:
+ *
+ *    callback( arg_list );
+ *
+ * ...so the parentheses are REQUIRED in the {arg_list}.
+ *
+ * NOTE that it does a sanity-check and also sets the
+ * current window.
+ *
+ */
+#if TARGET_HOST_MS_WINDOWS && !defined(_WIN32_WCE) /* FIXME: also WinCE? */
+#define INVOKE_WCB(window,cbname,arg_list)    \
+do                                            \
+{                                             \
+    if( FETCH_WCB( window, cbname ) )         \
+    {                                         \
+        FGCB ## cbname func = (FGCB ## cbname)(FETCH_WCB( window, cbname )); \
+        fgSetWindow( &window );               \
+        func arg_list;                        \
+    }                                         \
+} while( 0 )
+#else
+#define INVOKE_WCB(window,cbname,arg_list)    \
+do                                            \
+{                                             \
+    if( FETCH_WCB( window, cbname ) )         \
+    {                                         \
+        fgSetWindow( &window );               \
+        ((FGCB ## cbname)FETCH_WCB( window, cbname )) arg_list; \
+    }                                         \
+} while( 0 )
+#endif
+
+/*
+ * The window callbacks the user can supply us with. Should be kept portable.
+ *
+ * This enumeration provides the freeglut CallBack numbers.
+ * The symbolic constants are indices into a window's array of
+ * function callbacks.  The names are formed by splicing a common
+ * prefix onto the callback's base name.  (This was originally
+ * done so that an early stage of development could live side-by-
+ * side with the old callback code.  The old callback code used
+ * the bare callback's name as a structure member, so I used a
+ * prefix for the array index name.)
+ */
+enum
+{
+    WCB_Display,
+    WCB_Reshape,
+    WCB_Position,
+    WCB_Keyboard,
+    WCB_KeyboardExt,
+    WCB_KeyboardDown,
+    WCB_KeyboardUp,
+    WCB_Special,
+    WCB_SpecialUp,
+    WCB_Mouse,
+    WCB_MouseWheel,
+    WCB_Motion,
+    WCB_Passive,
+    WCB_Entry,
+    WCB_Visibility,
+    WCB_WindowStatus,
+    WCB_Joystick,
+    WCB_Destroy,
+
+    /* Multi-Pointer X and touch related */
+    WCB_MultiEntry,
+    WCB_MultiButton,
+    WCB_MultiMotion,
+    WCB_MultiPassive,
+
+    /* Mobile platforms LifeCycle */
+    WCB_InitContext,
+    WCB_AppStatus,
+
+    /* Presently ignored */
+    WCB_Select,
+    WCB_OverlayDisplay,
+    WCB_SpaceMotion,     /* presently implemented only on UNIX/X11 */
+    WCB_SpaceRotation,   /* presently implemented only on UNIX/X11 */
+    WCB_SpaceButton,     /* presently implemented only on UNIX/X11 */
+    WCB_Dials,
+    WCB_ButtonBox,
+    WCB_TabletMotion,
+    WCB_TabletButton,
+
+    /* Always make this the LAST one */
+    TOTAL_CALLBACKS
+};
+
+
+/* This structure holds the OpenGL rendering context for all the menu windows */
+typedef struct tagSFG_MenuContext SFG_MenuContext;
+struct tagSFG_MenuContext
+{
+    SFG_WindowContextType MContext;       /* The menu window's WGL context   */
+};
+
+/* This structure describes a menu */
+typedef struct tagSFG_Window SFG_Window;
+typedef struct tagSFG_MenuEntry SFG_MenuEntry;
+typedef struct tagSFG_Menu SFG_Menu;
+struct tagSFG_Menu
+{
+    SFG_Node            Node;
+    void               *UserData;     /* User data passed back at callback   */
+    int                 ID;           /* The global menu ID                  */
+    SFG_List            Entries;      /* The menu entries list               */
+    FGCBMenu            Callback;     /* The menu callback                   */
+    FGCBDestroy         Destroy;      /* Destruction callback                */
+    GLboolean           IsActive;     /* Is the menu selected?               */
+    void*               Font;         /* Font to be used for displaying this menu */
+    int                 Width;        /* Menu box width in pixels            */
+    int                 Height;       /* Menu box height in pixels           */
+    int                 X, Y;         /* Menu box raster position            */
+
+    SFG_MenuEntry      *ActiveEntry;  /* Currently active entry in the menu  */
+    SFG_Window         *Window;       /* Window for menu                     */
+    SFG_Window         *ParentWindow; /* Window in which the menu is invoked */
+};
+
+/* This is a menu entry */
+struct tagSFG_MenuEntry
+{
+    SFG_Node            Node;
+    int                 ID;                     /* The menu entry ID (local) */
+    int                 Ordinal;                /* The menu's ordinal number */
+    char*               Text;                   /* The text to be displayed  */
+    SFG_Menu*           SubMenu;                /* Optional sub-menu tree    */
+    GLboolean           IsActive;               /* Is the entry highlighted? */
+    int                 Width;                  /* Label's width in pixels   */
+};
+
+/*
+ * A window, making part of freeglut windows hierarchy.
+ * Should be kept portable.
+ *
+ * NOTE that ActiveMenu is set to menu itself if the window is a menu.
+ */
+struct tagSFG_Window
+{
+    SFG_Node            Node;
+    int                 ID;                     /* Window's ID number        */
+
+    SFG_Context         Window;                 /* Window and OpenGL context */
+    SFG_WindowState     State;                  /* The window state          */
+    SFG_Proc            CallBacks[ TOTAL_CALLBACKS ]; /* Array of window callbacks */
+    void               *UserData ;              /* For use by user           */
+
+    SFG_Menu*       Menu[ FREEGLUT_MAX_MENUS ]; /* Menus appended to window  */
+    SFG_Menu*       ActiveMenu;                 /* The window's active menu  */
+
+    SFG_Window*         Parent;                 /* The parent to this window */
+    SFG_List            Children;               /* The subwindows d.l. list  */
+
+    GLboolean           IsMenu;                 /* Set to 1 if we are a menu */
+};
+
+
+/* A linked list structure of windows */
+typedef struct tagSFG_WindowList SFG_WindowList ;
+struct tagSFG_WindowList
+{
+    SFG_Node node;
+    SFG_Window *window ;
+};
+
+/* This holds information about all the windows, menus etc. */
+typedef struct tagSFG_Structure SFG_Structure;
+struct tagSFG_Structure
+{
+    SFG_List        Windows;         /* The global windows list            */
+    SFG_List        Menus;           /* The global menus list              */
+    SFG_List        WindowsToDestroy;
+
+    SFG_Window*     CurrentWindow;   /* The currently set window          */
+    SFG_Menu*       CurrentMenu;     /* Same, but menu...                 */
+
+    SFG_MenuContext* MenuContext;    /* OpenGL rendering context for menus */
+
+    SFG_Window*      GameModeWindow; /* The game mode window               */
+
+    int              WindowID;       /* The window ID for the next window to be created */
+    int              MenuID;         /* The menu ID for the next menu to be created */
+};
+
+/*
+ * This structure is used for the enumeration purposes.
+ * You can easily extend its functionalities by declaring
+ * a structure containing enumerator's contents and custom
+ * data, then casting its pointer to (SFG_Enumerator *).
+ */
+typedef struct tagSFG_Enumerator SFG_Enumerator;
+struct tagSFG_Enumerator
+{
+    GLboolean   found;                          /* Used to terminate search  */
+    void*       data;                           /* Custom data pointer       */
+};
+typedef void (* FGCBWindowEnumerator  )( SFG_Window *, SFG_Enumerator * );
+typedef void (* FGCBMenuEnumerator  )( SFG_Menu *, SFG_Enumerator * );
+
+/* The bitmap font structure */
+typedef struct tagSFG_Font SFG_Font;
+struct tagSFG_Font
+{
+    char*           Name;         /* The source font name             */
+    int             Quantity;     /* Number of chars in font          */
+    int             Height;       /* Height of the characters         */
+    const GLubyte** Characters;   /* The characters mapping           */
+
+    float           xorig, yorig; /* Relative origin of the character */
+};
+
+/* The stroke font structures */
+
+typedef struct tagSFG_StrokeVertex SFG_StrokeVertex;
+struct tagSFG_StrokeVertex
+{
+    GLfloat         X, Y;
+};
+
+typedef struct tagSFG_StrokeStrip SFG_StrokeStrip;
+struct tagSFG_StrokeStrip
+{
+    int             Number;
+    const SFG_StrokeVertex* Vertices;
+};
+
+typedef struct tagSFG_StrokeChar SFG_StrokeChar;
+struct tagSFG_StrokeChar
+{
+    GLfloat         Right;
+    int             Number;
+    const SFG_StrokeStrip* Strips;
+};
+
+typedef struct tagSFG_StrokeFont SFG_StrokeFont;
+struct tagSFG_StrokeFont
+{
+    char*           Name;                       /* The source font name      */
+    int             Quantity;                   /* Number of chars in font   */
+    GLfloat         Height;                     /* Height of the characters  */
+    const SFG_StrokeChar** Characters;          /* The characters mapping    */
+};
+
+
+/* -- JOYSTICK-SPECIFIC STRUCTURES AND TYPES ------------------------------- */
+/*
+ * Initial defines from "js.h" starting around line 33 with the existing "fg_joystick.c"
+ * interspersed
+ */
+
+#if TARGET_HOST_MACINTOSH
+#    include <InputSprocket.h>
+#endif
+
+#if TARGET_HOST_MAC_OSX
+#    include <mach/mach.h>
+#    include <IOKit/IOkitLib.h>
+#    include <IOKit/hid/IOHIDLib.h>
+#endif
+
+/* XXX It might be better to poll the operating system for the numbers of buttons and
+ * XXX axes and then dynamically allocate the arrays.
+ */
+#define _JS_MAX_BUTTONS 32
+
+#if TARGET_HOST_MACINTOSH
+#    define _JS_MAX_AXES  9
+typedef struct tagSFG_PlatformJoystick SFG_PlatformJoystick;
+struct tagSFG_PlatformJoystick
+{
+#define  ISP_NUM_AXIS    9
+#define  ISP_NUM_NEEDS  41
+    ISpElementReference isp_elem  [ ISP_NUM_NEEDS ];
+    ISpNeed             isp_needs [ ISP_NUM_NEEDS ];
+};
+#endif
+
+#if TARGET_HOST_MAC_OSX
+#    define _JS_MAX_AXES 16
+typedef struct tagSFG_PlatformJoystick SFG_PlatformJoystick;
+struct tagSFG_PlatformJoystick
+{
+    IOHIDDeviceInterface ** hidDev;
+    IOHIDElementCookie buttonCookies[41];
+    IOHIDElementCookie axisCookies[_JS_MAX_AXES];
+/* The next two variables are not used anywhere */
+/*    long minReport[_JS_MAX_AXES],
+ *         maxReport[_JS_MAX_AXES];
+ */
+};
+#endif
+
+
+/*
+ * Definition of "SFG_Joystick" structure -- based on JS's "jsJoystick" object class.
+ * See "js.h" lines 80-178.
+ */
+typedef struct tagSFG_Joystick SFG_Joystick;
+struct tagSFG_Joystick
+{
+	SFG_PlatformJoystick pJoystick;
+
+    int          id;
+    GLboolean    error;
+    char         name [ 128 ];
+    int          num_axes;
+    int          num_buttons;
+
+    float dead_band[ _JS_MAX_AXES ];
+    float saturate [ _JS_MAX_AXES ];
+    float center   [ _JS_MAX_AXES ];
+    float max      [ _JS_MAX_AXES ];
+    float min      [ _JS_MAX_AXES ];
+};
+
+
+
+/* -- GLOBAL VARIABLES EXPORTS --------------------------------------------- */
+
+/* Freeglut display related stuff (initialized once per session) */
+extern SFG_Display fgDisplay;
+
+/* Freeglut internal structure */
+extern SFG_Structure fgStructure;
+
+/* The current freeglut settings */
+extern SFG_State fgState;
+
+
+/* -- PRIVATE FUNCTION DECLARATIONS ---------------------------------------- */
+
+/*
+ * A call to this function makes us sure that the Display and Structure
+ * subsystems have been properly initialized and are ready to be used
+ */
+#define  FREEGLUT_EXIT_IF_NOT_INITIALISED( string )               \
+  if ( ! fgState.Initialised )                                    \
+  {                                                               \
+    fgError ( " ERROR:  Function <%s> called"                     \
+              " without first calling 'glutInit'.", (string) ) ;  \
+  }
+
+#define  FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED( string )  \
+  if ( ! fgState.Initialised )                                      \
+  {                                                                 \
+    fgError ( " ERROR:  Internal <%s> function called"              \
+              " without first calling 'glutInit'.", (string) ) ;    \
+  }
+
+#define  FREEGLUT_INTERNAL_ERROR_EXIT( cond, string, function )  \
+  if ( ! ( cond ) )                                              \
+  {                                                              \
+    fgError ( " ERROR:  Internal error <%s> in function %s",     \
+              (string), (function) ) ;                           \
+  }
+
+/*
+ * Following definitions are somewhat similar to GLib's,
+ * but do not generate any log messages:
+ */
+#define  freeglut_return_if_fail( expr ) \
+    if( !(expr) )                        \
+        return;
+#define  freeglut_return_val_if_fail( expr, val ) \
+    if( !(expr) )                                 \
+        return val ;
+
+/*
+ * A call to those macros assures us that there is a current
+ * window set, respectively:
+ */
+#define  FREEGLUT_EXIT_IF_NO_WINDOW( string )                               \
+  if ( ! fgStructure.CurrentWindow &&                                       \
+       ( fgState.ActionOnWindowClose != GLUT_ACTION_CONTINUE_EXECUTION ) )  \
+  {                                                                         \
+    fgError ( " ERROR:  Function <%s> called"                               \
+              " with no current window defined.", (string) ) ;              \
+  }
+
+/*
+ * The deinitialize function gets called on glutMainLoop() end. It should clean up
+ * everything inside of the freeglut
+ */
+void fgDeinitialize( void );
+
+/*
+ * Those two functions are used to create/destroy the freeglut internal
+ * structures. This actually happens when calling glutInit() and when
+ * quitting the glutMainLoop() (which actually happens, when all windows
+ * have been closed).
+ */
+void fgCreateStructure( void );
+void fgDestroyStructure( void );
+
+/*
+ * Window creation, opening, closing and destruction.
+ * Also CallBack clearing/initialization.
+ * Defined in fg_structure.c, fg_window.c.
+ */
+SFG_Window* fgCreateWindow( SFG_Window* parent, const char* title,
+                            GLboolean positionUse, int x, int y,
+                            GLboolean sizeUse, int w, int h,
+                            GLboolean gameMode, GLboolean isMenu );
+void        fgSetWindow ( SFG_Window *window );
+void        fgOpenWindow( SFG_Window* window, const char* title,
+                          GLboolean positionUse, int x, int y,
+                          GLboolean sizeUse, int w, int h,
+                          GLboolean gameMode, GLboolean isSubWindow );
+void        fgCloseWindow( SFG_Window* window );
+void        fgAddToWindowDestroyList ( SFG_Window* window );
+void        fgCloseWindows ();
+void        fgDestroyWindow( SFG_Window* window );
+
+/* Menu creation and destruction. Defined in fg_structure.c */
+SFG_Menu*   fgCreateMenu( FGCBMenu menuCallback );
+void        fgDestroyMenu( SFG_Menu* menu );
+
+/* Joystick device management functions, defined in fg_joystick.c */
+int         fgJoystickDetect( void );
+void        fgInitialiseJoysticks( void );
+void        fgJoystickClose( void );
+void        fgJoystickPollWindow( SFG_Window* window );
+
+/* InputDevice Initialisation and Closure */
+int         fgInputDeviceDetect( void );
+void        fgInitialiseInputDevices( void );
+void        fgInputDeviceClose( void );
+
+/* spaceball device functions, defined in fg_spaceball.c */
+void        fgInitialiseSpaceball( void );
+void        fgSpaceballClose( void );
+void        fgSpaceballSetWindow( SFG_Window *window );
+
+int         fgHasSpaceball( void );
+int         fgSpaceballNumButtons( void );
+
+/* Setting the cursor for a given window */
+void fgSetCursor ( SFG_Window *window, int cursorID );
+
+/*
+ * Helper function to enumerate through all registered windows
+ * and one to enumerate all of a window's subwindows...
+ *
+ * The GFunc callback for those functions will be defined as:
+ *
+ *      void enumCallback( gpointer window, gpointer enumerator );
+ *
+ * where window is the enumerated (sub)window pointer (SFG_Window *),
+ * and userData is the a custom user-supplied pointer. Functions
+ * are defined and exported from fg_structure.c file.
+ */
+void fgEnumWindows( FGCBWindowEnumerator enumCallback, SFG_Enumerator* enumerator );
+void fgEnumSubWindows( SFG_Window* window, FGCBWindowEnumerator enumCallback,
+                       SFG_Enumerator* enumerator );
+
+/*
+ * fgWindowByHandle returns a (SFG_Window *) value pointing to the
+ * first window in the queue matching the specified window handle.
+ * The function is defined in fg_structure.c file.
+ */
+SFG_Window* fgWindowByHandle( SFG_WindowHandleType hWindow );
+
+/*
+ * This function is similar to the previous one, except it is
+ * looking for a specified (sub)window identifier. The function
+ * is defined in fg_structure.c file.
+ */
+SFG_Window* fgWindowByID( int windowID );
+
+/*
+ * Looks up a menu given its ID. This is easier than fgWindowByXXX
+ * as all menus are placed in a single doubly linked list...
+ */
+SFG_Menu* fgMenuByID( int menuID );
+
+/*
+ * Returns active menu, if any. Assumption: only one menu active throughout application at any one time.
+ * This is easier than fgWindowByXXX as all menus are placed in one doubly linked list...
+ */
+SFG_Menu* fgGetActiveMenu( );
+
+/*
+ * The menu activation and deactivation the code. This is the meat
+ * of the menu user interface handling code...
+ */
+void fgUpdateMenuHighlight ( SFG_Menu *menu );
+GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
+                              int mouse_x, int mouse_y );
+void fgDeactivateMenu( SFG_Window *window );
+
+/*
+ * This function gets called just before the buffers swap, so that
+ * freeglut can display the pull-down menus via OpenGL. The function
+ * is defined in fg_menu.c file.
+ */
+void fgDisplayMenu( void );
+
+/* Elapsed time as per glutGet(GLUT_ELAPSED_TIME). */
+fg_time_t fgElapsedTime( void );
+
+/* System time in milliseconds */
+fg_time_t fgSystemTime(void);
+
+/* List functions */
+void fgListInit(SFG_List *list);
+void fgListAppend(SFG_List *list, SFG_Node *node);
+void fgListRemove(SFG_List *list, SFG_Node *node);
+int fgListLength(SFG_List *list);
+void fgListInsert(SFG_List *list, SFG_Node *next, SFG_Node *node);
+
+/* Error Message functions */
+void fgError( const char *fmt, ... );
+void fgWarning( const char *fmt, ... );
+
+SFG_Proc fgPlatformGetProcAddress( const char *procName );
+
+void fgPlatformSetClipboard(int selection, const char *text);
+const char *fgPlatformGetClipboard(int selection);
+
+/* pushing attribute/value pairs into an array */
+#define ATTRIB(a) attributes[where++]=(a)
+#define ATTRIB_VAL(a,v) {ATTRIB(a); ATTRIB(v);}
+
+int fghMapBit( int mask, int from, int to );
+int fghIsLegacyContextRequested( void );
+void fghContextCreationError( void );
+int fghNumberOfAuxBuffersRequested( void );
+
+#endif /* FREEGLUT_INTERNAL_H */
+
+/*** END OF FILE ***/