/*
 * freeglut_main.c
 *
 * The windows message processing methods.
 *
 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
 * Creation date: Fri Dec 3 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.
 */

#include "freeglut.h"
#include "freeglut_internal.h"
#if HAVE_ERRNO
#    include <errno.h>
#endif
#include <stdarg.h>
#if  HAVE_VPRINTF
#    define VFPRINTF(s,f,a) vfprintf((s),(f),(a))
#elif HAVE_DOPRNT
#    define VFPRINTF(s,f,a) _doprnt((f),(a),(s))
#else
#    define VFPRINTF(s,f,a)
#endif

#ifdef _WIN32_WCE

typedef struct GXDisplayProperties GXDisplayProperties;
typedef struct GXKeyList GXKeyList;
#include <gx.h>

typedef struct GXKeyList (*GXGETDEFAULTKEYS)(int);
typedef int (*GXOPENINPUT)();

GXGETDEFAULTKEYS GXGetDefaultKeys_ = NULL;
GXOPENINPUT GXOpenInput_ = NULL;

struct GXKeyList gxKeyList;

#endif /* _WIN32_WCE */

/*
 * Try to get the maximum value allowed for ints, falling back to the minimum
 * guaranteed by ISO C99 if there is no suitable header.
 */
#if HAVE_LIMITS_H
#    include <limits.h>
#endif
#ifndef INT_MAX
#    define INT_MAX 32767
#endif

#ifndef MIN
#    define MIN(a,b) (((a)<(b)) ? (a) : (b))
#endif


/*
 * TODO BEFORE THE STABLE RELEASE:
 *
 * There are some issues concerning window redrawing under X11, and maybe
 * some events are not handled. The Win32 version lacks some more features,
 * but seems acceptable for not demanding purposes.
 *
 * Need to investigate why the X11 version breaks out with an error when
 * closing a window (using the window manager, not glutDestroyWindow)...
 */

/* -- PRIVATE FUNCTIONS ---------------------------------------------------- */

/*
 * Handle a window configuration change. When no reshape
 * callback is hooked, the viewport size is updated to
 * match the new window size.
 */
static void fghReshapeWindow ( SFG_Window *window, int width, int height )
{
    SFG_Window *current_window = fgStructure.CurrentWindow;

    freeglut_return_if_fail( window != NULL );


#if TARGET_HOST_POSIX_X11

    XResizeWindow( fgDisplay.Display, window->Window.Handle,
                   width, height );
    XFlush( fgDisplay.Display ); /* XXX Shouldn't need this */

#elif TARGET_HOST_MS_WINDOWS && !defined(_WIN32_WCE)
    {
        RECT winRect;
        int x, y, w, h;

        /*
         * For windowed mode, get the current position of the
         * window and resize taking the size of the frame
         * decorations into account.
         */

        /* "GetWindowRect" returns the pixel coordinates of the outside of the window */
        GetWindowRect( window->Window.Handle, &winRect );
        x = winRect.left;
        y = winRect.top;
        w = width;
        h = height;

        if ( window->Parent == NULL )
        {
            if ( ! window->IsMenu && (window != fgStructure.GameModeWindow) )
            {
                w += GetSystemMetrics( SM_CXSIZEFRAME ) * 2;
                h += GetSystemMetrics( SM_CYSIZEFRAME ) * 2 +
                     GetSystemMetrics( SM_CYCAPTION );
            }
        }
        else
        {
            RECT parentRect;
            GetWindowRect( window->Parent->Window.Handle, &parentRect );
            x -= parentRect.left + GetSystemMetrics( SM_CXSIZEFRAME ) * 2;
            y -= parentRect.top  + GetSystemMetrics( SM_CYSIZEFRAME ) * 2 +
                                   GetSystemMetrics( SM_CYCAPTION );
        }

        /*
         * SWP_NOACTIVATE      Do not activate the window
         * SWP_NOOWNERZORDER   Do not change position in z-order
         * SWP_NOSENDCHANGING  Supress WM_WINDOWPOSCHANGING message
         * SWP_NOZORDER        Retains the current Z order (ignore 2nd param)
         */

        SetWindowPos( window->Window.Handle,
                      HWND_TOP,
                      x, y, w, h,
                      SWP_NOACTIVATE | SWP_NOOWNERZORDER | SWP_NOSENDCHANGING |
                      SWP_NOZORDER
        );
    }
#endif

    /*
     * XXX Should update {window->State.OldWidth, window->State.OldHeight}
     * XXX to keep in lockstep with POSIX_X11 code.
     */
    if( FETCH_WCB( *window, Reshape ) )
        INVOKE_WCB( *window, Reshape, ( width, height ) );
    else
    {
        fgSetWindow( window );
        glViewport( 0, 0, width, height );
    }

    /*
     * Force a window redraw.  In Windows at least this is only a partial
     * solution:  if the window is increasing in size in either dimension,
     * the already-drawn part does not get drawn again and things look funny.
     * But without this we get this bad behaviour whenever we resize the
     * window.
     */
    window->State.Redisplay = GL_TRUE;

    if( window->IsMenu )
        fgSetWindow( current_window );
}

/*
 * Calls a window's redraw method. This is used when
 * a redraw is forced by the incoming window messages.
 */
static void fghRedrawWindow ( SFG_Window *window )
{
    SFG_Window *current_window = fgStructure.CurrentWindow;

    freeglut_return_if_fail( window );
    freeglut_return_if_fail( FETCH_WCB ( *window, Display ) );

    window->State.Redisplay = GL_FALSE;

    freeglut_return_if_fail( window->State.Visible );

    fgSetWindow( window );

    if( window->State.NeedToResize )
    {
        fghReshapeWindow(
            window,
            window->State.Width,
            window->State.Height
        );

        window->State.NeedToResize = GL_FALSE;
    }

    INVOKE_WCB( *window, Display, ( ) );

    fgSetWindow( current_window );
}

/*
 * A static helper function to execute display callback for a window
 */
static void fghcbDisplayWindow( SFG_Window *window,
                                SFG_Enumerator *enumerator )
{
    if( window->State.Redisplay &&
        window->State.Visible )
    {
        window->State.Redisplay = GL_FALSE;

#if TARGET_HOST_POSIX_X11
        fghRedrawWindow ( window ) ;
#elif TARGET_HOST_MS_WINDOWS
        RedrawWindow(
            window->Window.Handle, NULL, NULL,
            RDW_NOERASE | RDW_INTERNALPAINT | RDW_INVALIDATE | RDW_UPDATENOW
        );
#endif
    }

    fgEnumSubWindows( window, fghcbDisplayWindow, enumerator );
}

/*
 * Make all windows perform a display call
 */
static void fghDisplayAll( void )
{
    SFG_Enumerator enumerator;

    enumerator.found = GL_FALSE;
    enumerator.data  =  NULL;

    fgEnumWindows( fghcbDisplayWindow, &enumerator );
}

/*
 * Window enumerator callback to check for the joystick polling code
 */
static void fghcbCheckJoystickPolls( SFG_Window *window,
                                     SFG_Enumerator *enumerator )
{
    long int checkTime = fgElapsedTime( );

    if( window->State.JoystickLastPoll + window->State.JoystickPollRate <=
        checkTime )
    {
#if !defined(_WIN32_WCE)
        fgJoystickPollWindow( window );
#endif /* !defined(_WIN32_WCE) */
        window->State.JoystickLastPoll = checkTime;
    }

    fgEnumSubWindows( window, fghcbCheckJoystickPolls, enumerator );
}

/*
 * Check all windows for joystick polling
 */
static void fghCheckJoystickPolls( void )
{
    SFG_Enumerator enumerator;

    enumerator.found = GL_FALSE;
    enumerator.data  =  NULL;

    fgEnumWindows( fghcbCheckJoystickPolls, &enumerator );
}

/*
 * Check the global timers
 */
static void fghCheckTimers( void )
{
    long checkTime = fgElapsedTime( );

    while( fgState.Timers.First )
    {
        SFG_Timer *timer = fgState.Timers.First;

        if( timer->TriggerTime > checkTime )
            break;

        fgListRemove( &fgState.Timers, &timer->Node );
        fgListAppend( &fgState.FreeTimers, &timer->Node );

        timer->Callback( timer->ID );
    }
}

 
/* Platform-dependent time in milliseconds, as an unsigned 32-bit integer.
 * This value wraps every 49.7 days, but integer overflows cancel
 * when subtracting an initial start time, unless the total time exceeds
 * 32-bit, where the GLUT API return value is also overflowed.
 */  
unsigned long fgSystemTime(void) {
#if TARGET_HOST_SOLARIS || HAVE_GETTIMEOFDAY
    struct timeval now;
    gettimeofday( &now, NULL );
    return now.tv_usec/1000 + now.tv_sec*1000;
#elif TARGET_HOST_MS_WINDOWS
#    if defined(_WIN32_WCE)
    return GetTickCount();
#    else
    return timeGetTime();
#    endif
#endif
}
  
/*
 * Elapsed Time
 */
long fgElapsedTime( void )
{
    return (long) (fgSystemTime() - fgState.Time);
}

/*
 * Error Messages.
 */
void fgError( const char *fmt, ... )
{
    va_list ap;

    va_start( ap, fmt );

    fprintf( stderr, "freeglut ");
    if( fgState.ProgramName )
        fprintf( stderr, "(%s): ", fgState.ProgramName );
    VFPRINTF( stderr, fmt, ap );
    fprintf( stderr, "\n" );

    va_end( ap );

    if ( fgState.Initialised )
        fgDeinitialize ();

    exit( 1 );
}

void fgWarning( const char *fmt, ... )
{
    va_list ap;

    va_start( ap, fmt );

    fprintf( stderr, "freeglut ");
    if( fgState.ProgramName )
        fprintf( stderr, "(%s): ", fgState.ProgramName );
    VFPRINTF( stderr, fmt, ap );
    fprintf( stderr, "\n" );

    va_end( ap );
}

/*
 * Indicates whether Joystick events are being used by ANY window.
 *
 * The current mechanism is to walk all of the windows and ask if
 * there is a joystick callback.  We have a short-circuit early
 * return if we find any joystick handler registered.
 *
 * The real way to do this is to make use of the glutTimer() API
 * to more cleanly re-implement the joystick API.  Then, this code
 * and all other "joystick timer" code can be yanked.
 *
 */
static void fghCheckJoystickCallback( SFG_Window* w, SFG_Enumerator* e)
{
    if( FETCH_WCB( *w, Joystick ) )
    {
        e->found = GL_TRUE;
        e->data = w;
    }
    fgEnumSubWindows( w, fghCheckJoystickCallback, e );
}
static int fghHaveJoystick( void )
{
    SFG_Enumerator enumerator;

    enumerator.found = GL_FALSE;
    enumerator.data = NULL;
    fgEnumWindows( fghCheckJoystickCallback, &enumerator );
    return !!enumerator.data;
}
static void fghHavePendingRedisplaysCallback( SFG_Window* w, SFG_Enumerator* e)
{
    if( w->State.Redisplay && w->State.Visible )
    {
        e->found = GL_TRUE;
        e->data = w;
    }
    fgEnumSubWindows( w, fghHavePendingRedisplaysCallback, e );
}
static int fghHavePendingRedisplays (void)
{
    SFG_Enumerator enumerator;

    enumerator.found = GL_FALSE;
    enumerator.data = NULL;
    fgEnumWindows( fghHavePendingRedisplaysCallback, &enumerator );
    return !!enumerator.data;
}
/*
 * Returns the number of GLUT ticks (milliseconds) till the next timer event.
 */
static long fghNextTimer( void )
{
    long ret = INT_MAX;
    SFG_Timer *timer = fgState.Timers.First;

    if( timer )
        ret = timer->TriggerTime - fgElapsedTime();
    if( ret < 0 )
        ret = 0;

    return ret;
}
/*
 * Does the magic required to relinquish the CPU until something interesting
 * happens.
 */
static void fghSleepForEvents( void )
{
    long msec;

    if( fgState.IdleCallback || fghHavePendingRedisplays( ) )
        return;

    msec = fghNextTimer( );
    /* XXX Use GLUT timers for joysticks... */
    /* XXX Dumb; forces granularity to .01sec */
    if( fghHaveJoystick( ) && ( msec > 10 ) )     
        msec = 10;

#if TARGET_HOST_POSIX_X11
    /*
     * Possibly due to aggressive use of XFlush() and friends,
     * it is possible to have our socket drained but still have
     * unprocessed events.  (Or, this may just be normal with
     * X, anyway?)  We do non-trivial processing of X events
     * after the event-reading loop, in any case, so we
     * need to allow that we may have an empty socket but non-
     * empty event queue.
     */
    if( ! XPending( fgDisplay.Display ) )
    {
        fd_set fdset;
        int err;
        int socket;
        struct timeval wait;

        socket = ConnectionNumber( fgDisplay.Display );
        FD_ZERO( &fdset );
        FD_SET( socket, &fdset );
        wait.tv_sec = msec / 1000;
        wait.tv_usec = (msec % 1000) * 1000;
        err = select( socket+1, &fdset, NULL, NULL, &wait );

#if HAVE_ERRNO
        if( ( -1 == err ) && ( errno != EINTR ) )
            fgWarning ( "freeglut select() error: %d", errno );
#endif
    }
#elif TARGET_HOST_MS_WINDOWS
    MsgWaitForMultipleObjects( 0, NULL, FALSE, msec, QS_ALLINPUT );
#endif
}

#if TARGET_HOST_POSIX_X11
/*
 * Returns GLUT modifier mask for the state field of an X11 event.
 */
static int fghGetXModifiers( int state )
{
    int ret = 0;

    if( state & ( ShiftMask | LockMask ) )
        ret |= GLUT_ACTIVE_SHIFT;
    if( state & ControlMask )
        ret |= GLUT_ACTIVE_CTRL;
    if( state & Mod1Mask )
        ret |= GLUT_ACTIVE_ALT;

    return ret;
}
#endif


#if TARGET_HOST_POSIX_X11 && _DEBUG

static const char* fghTypeToString( int type )
{
    switch( type ) {
    case KeyPress: return "KeyPress";
    case KeyRelease: return "KeyRelease";
    case ButtonPress: return "ButtonPress";
    case ButtonRelease: return "ButtonRelease";
    case MotionNotify: return "MotionNotify";
    case EnterNotify: return "EnterNotify";
    case LeaveNotify: return "LeaveNotify";
    case FocusIn: return "FocusIn";
    case FocusOut: return "FocusOut";
    case KeymapNotify: return "KeymapNotify";
    case Expose: return "Expose";
    case GraphicsExpose: return "GraphicsExpose";
    case NoExpose: return "NoExpose";
    case VisibilityNotify: return "VisibilityNotify";
    case CreateNotify: return "CreateNotify";
    case DestroyNotify: return "DestroyNotify";
    case UnmapNotify: return "UnmapNotify";
    case MapNotify: return "MapNotify";
    case MapRequest: return "MapRequest";
    case ReparentNotify: return "ReparentNotify";
    case ConfigureNotify: return "ConfigureNotify";
    case ConfigureRequest: return "ConfigureRequest";
    case GravityNotify: return "GravityNotify";
    case ResizeRequest: return "ResizeRequest";
    case CirculateNotify: return "CirculateNotify";
    case CirculateRequest: return "CirculateRequest";
    case PropertyNotify: return "PropertyNotify";
    case SelectionClear: return "SelectionClear";
    case SelectionRequest: return "SelectionRequest";
    case SelectionNotify: return "SelectionNotify";
    case ColormapNotify: return "ColormapNotify";
    case ClientMessage: return "ClientMessage";
    case MappingNotify: return "MappingNotify";
    default: return "UNKNOWN";
    }
}

static const char* fghBoolToString( Bool b )
{
    return b == False ? "False" : "True";
}

static const char* fghNotifyHintToString( char is_hint )
{
    switch( is_hint ) {
    case NotifyNormal: return "NotifyNormal";
    case NotifyHint: return "NotifyHint";
    default: return "UNKNOWN";
    }
}

static const char* fghNotifyModeToString( int mode )
{
    switch( mode ) {
    case NotifyNormal: return "NotifyNormal";
    case NotifyGrab: return "NotifyGrab";
    case NotifyUngrab: return "NotifyUngrab";
    case NotifyWhileGrabbed: return "NotifyWhileGrabbed";
    default: return "UNKNOWN";
    }
}

static const char* fghNotifyDetailToString( int detail )
{
    switch( detail ) {
    case NotifyAncestor: return "NotifyAncestor";
    case NotifyVirtual: return "NotifyVirtual";
    case NotifyInferior: return "NotifyInferior";
    case NotifyNonlinear: return "NotifyNonlinear";
    case NotifyNonlinearVirtual: return "NotifyNonlinearVirtual";
    case NotifyPointer: return "NotifyPointer";
    case NotifyPointerRoot: return "NotifyPointerRoot";
    case NotifyDetailNone: return "NotifyDetailNone";
    default: return "UNKNOWN";
    }
}

static const char* fghVisibilityToString( int state ) {
    switch( state ) {
    case VisibilityUnobscured: return "VisibilityUnobscured";
    case VisibilityPartiallyObscured: return "VisibilityPartiallyObscured";
    case VisibilityFullyObscured: return "VisibilityFullyObscured";
    default: return "UNKNOWN";
    }
}

static const char* fghConfigureDetailToString( int detail )
{
    switch( detail ) {
    case Above: return "Above";
    case Below: return "Below";
    case TopIf: return "TopIf";
    case BottomIf: return "BottomIf";
    case Opposite: return "Opposite";
    default: return "UNKNOWN";
    }
}

static const char* fghPlaceToString( int place )
{
    switch( place ) {
    case PlaceOnTop: return "PlaceOnTop";
    case PlaceOnBottom: return "PlaceOnBottom";
    default: return "UNKNOWN";
    }
}

static const char* fghMappingRequestToString( int request )
{
    switch( request ) {
    case MappingModifier: return "MappingModifier";
    case MappingKeyboard: return "MappingKeyboard";
    case MappingPointer: return "MappingPointer";
    default: return "UNKNOWN";
    }
}

static const char* fghPropertyStateToString( int state )
{
    switch( state ) {
    case PropertyNewValue: return "PropertyNewValue";
    case PropertyDelete: return "PropertyDelete";
    default: return "UNKNOWN";
    }
}

static const char* fghColormapStateToString( int state )
{
    switch( state ) {
    case ColormapUninstalled: return "ColormapUninstalled";
    case ColormapInstalled: return "ColormapInstalled";
    default: return "UNKNOWN";
    }
}

static void fghPrintEvent( XEvent *event )
{
    switch( event->type ) {

    case KeyPress:
    case KeyRelease: {
        XKeyEvent *e = &event->xkey;
        fgWarning( "%s: window=0x%x, root=0x%x, subwindow=0x%x, time=%lu, "
                   "(x,y)=(%d,%d), (x_root,y_root)=(%d,%d), state=0x%x, "
                   "keycode=%u, same_screen=%s", fghTypeToString( e->type ),
                   e->window, e->root, e->subwindow, (unsigned long)e->time,
                   e->x, e->y, e->x_root, e->y_root, e->state, e->keycode,
                   fghBoolToString( e->same_screen ) );
        break;
    }

    case ButtonPress:
    case ButtonRelease: {
        XButtonEvent *e = &event->xbutton;
        fgWarning( "%s: window=0x%x, root=0x%x, subwindow=0x%x, time=%lu, "
                   "(x,y)=(%d,%d), (x_root,y_root)=(%d,%d), state=0x%x, "
                   "button=%u, same_screen=%d", fghTypeToString( e->type ),
                   e->window, e->root, e->subwindow, (unsigned long)e->time,
                   e->x, e->y, e->x_root, e->y_root, e->state, e->button,
                   fghBoolToString( e->same_screen ) );
        break;
    }

    case MotionNotify: {
        XMotionEvent *e = &event->xmotion;
        fgWarning( "%s: window=0x%x, root=0x%x, subwindow=0x%x, time=%lu, "
                   "(x,y)=(%d,%d), (x_root,y_root)=(%d,%d), state=0x%x, "
                   "is_hint=%s, same_screen=%d", fghTypeToString( e->type ),
                   e->window, e->root, e->subwindow, (unsigned long)e->time,
                   e->x, e->y, e->x_root, e->y_root, e->state,
                   fghNotifyHintToString( e->is_hint ),
                   fghBoolToString( e->same_screen ) );
        break;
    }

    case EnterNotify:
    case LeaveNotify: {
        XCrossingEvent *e = &event->xcrossing;
        fgWarning( "%s: window=0x%x, root=0x%x, subwindow=0x%x, time=%lu, "
                   "(x,y)=(%d,%d), mode=%s, detail=%s, same_screen=%d, "
                   "focus=%d, state=0x%x", fghTypeToString( e->type ),
                   e->window, e->root, e->subwindow, (unsigned long)e->time,
                   e->x, e->y, fghNotifyModeToString( e->mode ),
                   fghNotifyDetailToString( e->detail ), (int)e->same_screen,
                   (int)e->focus, e->state );
        break;
    }

    case FocusIn:
    case FocusOut: {
        XFocusChangeEvent *e = &event->xfocus;
        fgWarning( "%s: window=0x%x, mode=%s, detail=%s",
                   fghTypeToString( e->type ), e->window,
                   fghNotifyModeToString( e->mode ),
                   fghNotifyDetailToString( e->detail ) );
        break;
    }

    case KeymapNotify: {
        XKeymapEvent *e = &event->xkeymap;
        char buf[32 * 2 + 1];
        int i;
        for ( i = 0; i < 32; i++ ) {
            snprintf( &buf[ i * 2 ], sizeof( buf ) - i * 2,
                      "%02x", e->key_vector[ i ] );
        }
        buf[ i ] = '\0';
        fgWarning( "%s: window=0x%x, %s", fghTypeToString( e->type ), e->window,
                   buf );
        break;
    }

    case Expose: {
        XExposeEvent *e = &event->xexpose;
        fgWarning( "%s: window=0x%x, (x,y)=(%d,%d), (width,height)=(%d,%d), "
                   "count=%d", fghTypeToString( e->type ), e->window, e->x,
                   e->y, e->width, e->height, e->count );
        break;
    }

    case GraphicsExpose: {
        XGraphicsExposeEvent *e = &event->xgraphicsexpose;
        fgWarning( "%s: drawable=0x%x, (x,y)=(%d,%d), (width,height)=(%d,%d), "
                   "count=%d, (major_code,minor_code)=(%d,%d)",
                   fghTypeToString( e->type ), e->drawable, e->x, e->y,
                   e->width, e->height, e->count, e->major_code,
                   e->minor_code );
        break;
    }

    case NoExpose: {
        XNoExposeEvent *e = &event->xnoexpose;
        fgWarning( "%s: drawable=0x%x, (major_code,minor_code)=(%d,%d)",
                   fghTypeToString( e->type ), e->drawable, e->major_code,
                   e->minor_code );
        break;
    }

    case VisibilityNotify: {
        XVisibilityEvent *e = &event->xvisibility;
        fgWarning( "%s: window=0x%x, state=%s", fghTypeToString( e->type ),
                   e->window, fghVisibilityToString( e->state) );
        break;
    }

    case CreateNotify: {
        XCreateWindowEvent *e = &event->xcreatewindow;
        fgWarning( "%s: (x,y)=(%d,%d), (width,height)=(%d,%d), border_width=%d, "
                   "window=0x%x, override_redirect=%s",
                   fghTypeToString( e->type ), e->x, e->y, e->width, e->height,
                   e->border_width, e->window,
                   fghBoolToString( e->override_redirect ) );
        break;
    }

    case DestroyNotify: {
        XDestroyWindowEvent *e = &event->xdestroywindow;
        fgWarning( "%s: event=0x%x, window=0x%x",
                   fghTypeToString( e->type ), e->event, e->window );
        break;
    }

    case UnmapNotify: {
        XUnmapEvent *e = &event->xunmap;
        fgWarning( "%s: event=0x%x, window=0x%x, from_configure=%s",
                   fghTypeToString( e->type ), e->event, e->window,
                   fghBoolToString( e->from_configure ) );
        break;
    }

    case MapNotify: {
        XMapEvent *e = &event->xmap;
        fgWarning( "%s: event=0x%x, window=0x%x, override_redirect=%s",
                   fghTypeToString( e->type ), e->event, e->window,
                   fghBoolToString( e->override_redirect ) );
        break;
    }

    case MapRequest: {
        XMapRequestEvent *e = &event->xmaprequest;
        fgWarning( "%s: parent=0x%x, window=0x%x",
                   fghTypeToString( event->type ), e->parent, e->window );
        break;
    }

    case ReparentNotify: {
        XReparentEvent *e = &event->xreparent;
        fgWarning( "%s: event=0x%x, window=0x%x, parent=0x%x, (x,y)=(%d,%d), "
                   "override_redirect=%s", fghTypeToString( e->type ),
                   e->event, e->window, e->parent, e->x, e->y,
                   fghBoolToString( e->override_redirect ) );
        break;
    }

    case ConfigureNotify: {
        XConfigureEvent *e = &event->xconfigure;
        fgWarning( "%s: event=0x%x, window=0x%x, (x,y)=(%d,%d), "
                   "(width,height)=(%d,%d), border_width=%d, above=0x%x, "
                   "override_redirect=%s", fghTypeToString( e->type ), e->event,
                   e->window, e->x, e->y, e->width, e->height, e->border_width,
                   e->above, fghBoolToString( e->override_redirect ) );
        break;
    }

    case ConfigureRequest: {
        XConfigureRequestEvent *e = &event->xconfigurerequest;
        fgWarning( "%s: parent=0x%x, window=0x%x, (x,y)=(%d,%d), "
                   "(width,height)=(%d,%d), border_width=%d, above=0x%x, "
                   "detail=%s, value_mask=%lx", fghTypeToString( e->type ),
                   e->parent, e->window, e->x, e->y, e->width, e->height,
                   e->border_width, e->above,
                   fghConfigureDetailToString( e->detail ), e->value_mask );
        break;
    }

    case GravityNotify: {
        XGravityEvent *e = &event->xgravity;
        fgWarning( "%s: event=0x%x, window=0x%x, (x,y)=(%d,%d)",
                   fghTypeToString( e->type ), e->event, e->window, e->x, e->y );
        break;
    }

    case ResizeRequest: {
        XResizeRequestEvent *e = &event->xresizerequest;
        fgWarning( "%s: window=0x%x, (width,height)=(%d,%d)",
                   fghTypeToString( e->type ), e->window, e->width, e->height );
        break;
    }

    case CirculateNotify: {
        XCirculateEvent *e = &event->xcirculate;
        fgWarning( "%s: event=0x%x, window=0x%x, place=%s",
                   fghTypeToString( e->type ), e->event, e->window,
                   fghPlaceToString( e->place ) );
        break;
    }

    case CirculateRequest: {
        XCirculateRequestEvent *e = &event->xcirculaterequest;
        fgWarning( "%s: parent=0x%x, window=0x%x, place=%s",
                   fghTypeToString( e->type ), e->parent, e->window,
                   fghPlaceToString( e->place ) );
        break;
    }

    case PropertyNotify: {
        XPropertyEvent *e = &event->xproperty;
        fgWarning( "%s: window=0x%x, atom=%lu, time=%lu, state=%s",
                   fghTypeToString( e->type ), e->window,
                   (unsigned long)e->atom, (unsigned long)e->time,
                   fghPropertyStateToString( e->state ) );
        break;
    }

    case SelectionClear: {
        XSelectionClearEvent *e = &event->xselectionclear;
        fgWarning( "%s: window=0x%x, selection=%lu, time=%lu",
                   fghTypeToString( e->type ), e->window,
                   (unsigned long)e->selection, (unsigned long)e->time );
        break;
    }

    case SelectionRequest: {
        XSelectionRequestEvent *e = &event->xselectionrequest;
        fgWarning( "%s: owner=0x%x, requestor=0x%x, selection=0x%x, "
                   "target=0x%x, property=%lu, time=%lu",
                   fghTypeToString( e->type ), e->owner, e->requestor,
                   (unsigned long)e->selection, (unsigned long)e->target,
                   (unsigned long)e->property, (unsigned long)e->time );
        break;
    }

    case SelectionNotify: {
        XSelectionEvent *e = &event->xselection;
        fgWarning( "%s: requestor=0x%x, selection=0x%x, target=0x%x, "
                   "property=%lu, time=%lu", fghTypeToString( e->type ),
                   e->requestor, (unsigned long)e->selection,
                   (unsigned long)e->target, (unsigned long)e->property,
                   (unsigned long)e->time );
        break;
    }

    case ColormapNotify: {
        XColormapEvent *e = &event->xcolormap;
        fgWarning( "%s: window=0x%x, colormap=%lu, new=%s, state=%s",
                   fghTypeToString( e->type ), e->window,
                   (unsigned long)e->colormap, fghBoolToString( e->new ),
                   fghColormapStateToString( e->state ) );
        break;
    }

    case ClientMessage: {
        XClientMessageEvent *e = &event->xclient;
        char buf[ 61 ];
        char* p = buf;
        char* end = buf + sizeof( buf );
        int i;
        switch( e->format ) {
        case 8:
          for ( i = 0; i < 20; i++, p += 3 ) {
                snprintf( p, end - p, " %02x", e->data.b[ i ] );
            }
            break;
        case 16:
            for ( i = 0; i < 10; i++, p += 5 ) {
                snprintf( p, end - p, " %04x", e->data.s[ i ] );
            }
            break;
        case 32:
            for ( i = 0; i < 5; i++, p += 9 ) {
                snprintf( p, end - p, " %08lx", e->data.l[ i ] );
            }
            break;
        }
        *p = '\0';
        fgWarning( "%s: window=0x%x, message_type=%lu, format=%d, data=(%s )",
                   fghTypeToString( e->type ), e->window,
                   (unsigned long)e->message_type, e->format, buf );
        break;
    }

    case MappingNotify: {
        XMappingEvent *e = &event->xmapping;
        fgWarning( "%s: window=0x%x, request=%s, first_keycode=%d, count=%d",
                   fghTypeToString( e->type ), e->window,
                   fghMappingRequestToString( e->request ), e->first_keycode,
                   e->count );
        break;
    }

    default: {
        fgWarning( "%s", fghTypeToString( event->type ) );
        break;
    }
    }
}

#endif

/* -- INTERFACE FUNCTIONS -------------------------------------------------- */

/*
 * Executes a single iteration in the freeglut processing loop.
 */
void FGAPIENTRY glutMainLoopEvent( void )
{
#if TARGET_HOST_POSIX_X11
    SFG_Window* window;
    XEvent event;

    /* This code was repeated constantly, so here it goes into a definition: */
#define GETWINDOW(a)                             \
    window = fgWindowByHandle( event.a.window ); \
    if( window == NULL )                         \
        break;

#define GETMOUSE(a)                              \
    window->State.MouseX = event.a.x;            \
    window->State.MouseY = event.a.y;

    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMainLoopEvent" );

    while( XPending( fgDisplay.Display ) )
    {
        XNextEvent( fgDisplay.Display, &event );
#if _DEBUG
        fghPrintEvent( &event );
#endif

        switch( event.type )
        {
        case ClientMessage:
            if(fgIsSpaceballXEvent(&event)) {
                fgSpaceballHandleXEvent(&event);
                break;
            }
            /* Destroy the window when the WM_DELETE_WINDOW message arrives */
            if( (Atom) event.xclient.data.l[ 0 ] == fgDisplay.DeleteWindow )
            {
                GETWINDOW( xclient );

                fgDestroyWindow ( window );

                if( fgState.ActionOnWindowClose == GLUT_ACTION_EXIT )
                {
                    fgDeinitialize( );
                    exit( 0 );
                }
                else if( fgState.ActionOnWindowClose == GLUT_ACTION_GLUTMAINLOOP_RETURNS )
                    fgState.ExecState = GLUT_EXEC_STATE_STOP;

                return;
            }
            break;

            /*
             * CreateNotify causes a configure-event so that sub-windows are
             * handled compatibly with GLUT.  Otherwise, your sub-windows
             * (in freeglut only) will not get an initial reshape event,
             * which can break things.
             *
             * GLUT presumably does this because it generally tries to treat
             * sub-windows the same as windows.
             */
        case CreateNotify:
        case ConfigureNotify:
            {
                int width, height;
                if( event.type == CreateNotify ) {
                    GETWINDOW( xcreatewindow );
                    width = event.xcreatewindow.width;
                    height = event.xcreatewindow.height;
                } else {
                    GETWINDOW( xconfigure );
                    width = event.xconfigure.width;
                    height = event.xconfigure.height;
                }

                if( ( width != window->State.OldWidth ) ||
                    ( height != window->State.OldHeight ) )
                {
                    SFG_Window *current_window = fgStructure.CurrentWindow;

                    window->State.OldWidth = width;
                    window->State.OldHeight = height;
                    if( FETCH_WCB( *window, Reshape ) )
                        INVOKE_WCB( *window, Reshape, ( width, height ) );
                    else
                    {
                        fgSetWindow( window );
                        glViewport( 0, 0, width, height );
                    }
                    glutPostRedisplay( );
                    if( window->IsMenu )
                        fgSetWindow( current_window );
                }
            }
            break;

        case DestroyNotify:
            /*
             * This is sent to confirm the XDestroyWindow call.
             *
             * XXX WHY is this commented out?  Should we re-enable it?
             */
            /* fgAddToWindowDestroyList ( window ); */
            break;

        case Expose:
            /*
             * We are too dumb to process partial exposes...
             *
             * XXX Well, we could do it.  However, it seems to only
             * XXX be potentially useful for single-buffered (since
             * XXX double-buffered does not respect viewport when we
             * XXX do a buffer-swap).
             *
             */
            if( event.xexpose.count == 0 )
            {
                GETWINDOW( xexpose );
                window->State.Redisplay = GL_TRUE;
            }
            break;

        case MapNotify:
            break;

        case UnmapNotify:
            /* We get this when iconifying a window. */ 
            GETWINDOW( xunmap );
            INVOKE_WCB( *window, WindowStatus, ( GLUT_HIDDEN ) );
            window->State.Visible = GL_FALSE;
            break;

        case MappingNotify:
            /*
             * Have the client's keyboard knowledge updated (xlib.ps,
             * page 206, says that's a good thing to do)
             */
            XRefreshKeyboardMapping( (XMappingEvent *) &event );
            break;

        case VisibilityNotify:
        {
            /*
             * Sending this event, the X server can notify us that the window
             * has just acquired one of the three possible visibility states:
             * VisibilityUnobscured, VisibilityPartiallyObscured or
             * VisibilityFullyObscured. Note that we DO NOT receive a
             * VisibilityNotify event when iconifying a window, we only get an
             * UnmapNotify then.
             */
            GETWINDOW( xvisibility );
            switch( event.xvisibility.state )
            {
            case VisibilityUnobscured:
                INVOKE_WCB( *window, WindowStatus, ( GLUT_FULLY_RETAINED ) );
                window->State.Visible = GL_TRUE;
                break;

            case VisibilityPartiallyObscured:
                INVOKE_WCB( *window, WindowStatus,
                            ( GLUT_PARTIALLY_RETAINED ) );
                window->State.Visible = GL_TRUE;
                break;

            case VisibilityFullyObscured:
                INVOKE_WCB( *window, WindowStatus, ( GLUT_FULLY_COVERED ) );
                window->State.Visible = GL_FALSE;
                break;

            default:
                fgWarning( "Unknown X visibility state: %d",
                           event.xvisibility.state );
                break;
            }
        }
        break;

        case EnterNotify:
        case LeaveNotify:
            GETWINDOW( xcrossing );
            GETMOUSE( xcrossing );
            if( ( event.type == LeaveNotify ) && window->IsMenu &&
                window->ActiveMenu && window->ActiveMenu->IsActive )
                fgUpdateMenuHighlight( window->ActiveMenu );

            INVOKE_WCB( *window, Entry, ( ( EnterNotify == event.type ) ?
                                          GLUT_ENTERED :
                                          GLUT_LEFT ) );
            break;

        case MotionNotify:
        {
            GETWINDOW( xmotion );
            GETMOUSE( xmotion );

            if( window->ActiveMenu )
            {
                if( window == window->ActiveMenu->ParentWindow )
                {
                    window->ActiveMenu->Window->State.MouseX =
                        event.xmotion.x_root - window->ActiveMenu->X;
                    window->ActiveMenu->Window->State.MouseY =
                        event.xmotion.y_root - window->ActiveMenu->Y;
                }

                fgUpdateMenuHighlight( window->ActiveMenu );

                break;
            }

            /*
             * XXX For more than 5 buttons, just check {event.xmotion.state},
             * XXX rather than a host of bit-masks?  Or maybe we need to
             * XXX track ButtonPress/ButtonRelease events in our own
             * XXX bit-mask?
             */
            fgState.Modifiers = fghGetXModifiers( event.xmotion.state );
            if ( event.xmotion.state & ( Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask ) ) {
                INVOKE_WCB( *window, Motion, ( event.xmotion.x,
                                               event.xmotion.y ) );
            } else {
                INVOKE_WCB( *window, Passive, ( event.xmotion.x,
                                                event.xmotion.y ) );
            }
            fgState.Modifiers = INVALID_MODIFIERS;
        }
        break;

        case ButtonRelease:
        case ButtonPress:
        {
            GLboolean pressed = GL_TRUE;
            int button;

            if( event.type == ButtonRelease )
                pressed = GL_FALSE ;

            /*
             * A mouse button has been pressed or released. Traditionally,
             * break if the window was found within the freeglut structures.
             */
            GETWINDOW( xbutton );
            GETMOUSE( xbutton );

            /*
             * An X button (at least in XFree86) is numbered from 1.
             * A GLUT button is numbered from 0.
             * Old GLUT passed through buttons other than just the first
             * three, though it only gave symbolic names and official
             * support to the first three.
             */
            button = event.xbutton.button - 1;

            /*
             * Do not execute the application's mouse callback if a menu
             * is hooked to this button.  In that case an appropriate
             * private call should be generated.
             */
            if( fgCheckActiveMenu( window, button, pressed,
                                   event.xbutton.x_root, event.xbutton.y_root ) )
                break;

            /*
             * Check if there is a mouse or mouse wheel callback hooked to the
             * window
             */
            if( ! FETCH_WCB( *window, Mouse ) &&
                ! FETCH_WCB( *window, MouseWheel ) )
                break;

            fgState.Modifiers = fghGetXModifiers( event.xbutton.state );

            /* Finally execute the mouse or mouse wheel callback */
            if( ( button < glutDeviceGet ( GLUT_NUM_MOUSE_BUTTONS ) ) || ( ! FETCH_WCB( *window, MouseWheel ) ) )
                INVOKE_WCB( *window, Mouse, ( button,
                                              pressed ? GLUT_DOWN : GLUT_UP,
                                              event.xbutton.x,
                                              event.xbutton.y )
                );
            else
            {
                /*
                 * Map 4 and 5 to wheel zero; EVEN to +1, ODD to -1
                 *  "  6 and 7 "    "   one; ...
                 *
                 * XXX This *should* be behind some variables/macros,
                 * XXX since the order and numbering isn't certain
                 * XXX See XFree86 configuration docs (even back in the
                 * XXX 3.x days, and especially with 4.x).
                 *
                 * XXX Note that {button} has already been decremeted
                 * XXX in mapping from X button numbering to GLUT.
                 */
                int wheel_number = (button - glutDeviceGet ( GLUT_NUM_MOUSE_BUTTONS )) / 2;
                int direction = -1;
                if( button % 2 )
                    direction = 1;

                if( pressed )
                    INVOKE_WCB( *window, MouseWheel, ( wheel_number,
                                                       direction,
                                                       event.xbutton.x,
                                                       event.xbutton.y )
                    );
            }
            fgState.Modifiers = INVALID_MODIFIERS;
        }
        break;

        case KeyRelease:
        case KeyPress:
        {
            FGCBKeyboard keyboard_cb;
            FGCBSpecial special_cb;

            GETWINDOW( xkey );
            GETMOUSE( xkey );

            /* Detect auto repeated keys, if configured globally or per-window */

            if ( fgState.KeyRepeat==GLUT_KEY_REPEAT_OFF || window->State.IgnoreKeyRepeat==GL_TRUE )
            {
                if (event.type==KeyRelease)
                {
                    /*
                     * Look at X11 keystate to detect repeat mode.
                     * While X11 says the key is actually held down, we'll ignore KeyRelease/KeyPress pairs.
                     */

                    char keys[32];
                    XQueryKeymap( fgDisplay.Display, keys ); /* Look at X11 keystate to detect repeat mode */

                    if ( event.xkey.keycode<256 )            /* XQueryKeymap is limited to 256 keycodes    */
                    {
                        if ( keys[event.xkey.keycode>>3] & (1<<(event.xkey.keycode%8)) )
                            window->State.KeyRepeating = GL_TRUE;
                        else
                            window->State.KeyRepeating = GL_FALSE;
                    }
                }
            }
            else
                window->State.KeyRepeating = GL_FALSE;

            /* Cease processing this event if it is auto repeated */

            if (window->State.KeyRepeating)
            {
                if (event.type == KeyPress) window->State.KeyRepeating = GL_FALSE;
                break;
            }

            if( event.type == KeyPress )
            {
                keyboard_cb = (FGCBKeyboard)( FETCH_WCB( *window, Keyboard ));
                special_cb  = (FGCBSpecial) ( FETCH_WCB( *window, Special  ));
            }
            else
            {
                keyboard_cb = (FGCBKeyboard)( FETCH_WCB( *window, KeyboardUp ));
                special_cb  = (FGCBSpecial) ( FETCH_WCB( *window, SpecialUp  ));
            }

            /* Is there a keyboard/special callback hooked for this window? */
            if( keyboard_cb || special_cb )
            {
                XComposeStatus composeStatus;
                char asciiCode[ 32 ];
                KeySym keySym;
                int len;

                /* Check for the ASCII/KeySym codes associated with the event: */
                len = XLookupString( &event.xkey, asciiCode, sizeof(asciiCode),
                                     &keySym, &composeStatus
                );

                /* GLUT API tells us to have two separate callbacks... */
                if( len > 0 )
                {
                    /* ...one for the ASCII translateable keypresses... */
                    if( keyboard_cb )
                    {
                        fgSetWindow( window );
                        fgState.Modifiers = fghGetXModifiers( event.xkey.state );
                        keyboard_cb( asciiCode[ 0 ],
                                     event.xkey.x, event.xkey.y
                        );
                        fgState.Modifiers = INVALID_MODIFIERS;
                    }
                }
                else
                {
                    int special = -1;

                    /*
                     * ...and one for all the others, which need to be
                     * translated to GLUT_KEY_Xs...
                     */
                    switch( keySym )
                    {
                    case XK_F1:     special = GLUT_KEY_F1;     break;
                    case XK_F2:     special = GLUT_KEY_F2;     break;
                    case XK_F3:     special = GLUT_KEY_F3;     break;
                    case XK_F4:     special = GLUT_KEY_F4;     break;
                    case XK_F5:     special = GLUT_KEY_F5;     break;
                    case XK_F6:     special = GLUT_KEY_F6;     break;
                    case XK_F7:     special = GLUT_KEY_F7;     break;
                    case XK_F8:     special = GLUT_KEY_F8;     break;
                    case XK_F9:     special = GLUT_KEY_F9;     break;
                    case XK_F10:    special = GLUT_KEY_F10;    break;
                    case XK_F11:    special = GLUT_KEY_F11;    break;
                    case XK_F12:    special = GLUT_KEY_F12;    break;

                    case XK_KP_Left:
                    case XK_Left:   special = GLUT_KEY_LEFT;   break;
                    case XK_KP_Right:
                    case XK_Right:  special = GLUT_KEY_RIGHT;  break;
                    case XK_KP_Up:
                    case XK_Up:     special = GLUT_KEY_UP;     break;
                    case XK_KP_Down:
                    case XK_Down:   special = GLUT_KEY_DOWN;   break;

                    case XK_KP_Prior:
                    case XK_Prior:  special = GLUT_KEY_PAGE_UP; break;
                    case XK_KP_Next:
                    case XK_Next:   special = GLUT_KEY_PAGE_DOWN; break;
                    case XK_KP_Home:
                    case XK_Home:   special = GLUT_KEY_HOME;   break;
                    case XK_KP_End:
                    case XK_End:    special = GLUT_KEY_END;    break;
                    case XK_KP_Insert:
                    case XK_Insert: special = GLUT_KEY_INSERT; break;

                    case XK_Num_Lock :  special = GLUT_KEY_NUM_LOCK;  break;
                    case XK_KP_Begin :  special = GLUT_KEY_BEGIN;     break;
                    case XK_KP_Delete:  special = GLUT_KEY_DELETE;    break;
                    }

                    /*
                     * Execute the callback (if one has been specified),
                     * given that the special code seems to be valid...
                     */
                    if( special_cb && (special != -1) )
                    {
                        fgSetWindow( window );
                        fgState.Modifiers = fghGetXModifiers( event.xkey.state );
                        special_cb( special, event.xkey.x, event.xkey.y );
                        fgState.Modifiers = INVALID_MODIFIERS;
                    }
                }
            }
        }
        break;

        case ReparentNotify:
            break; /* XXX Should disable this event */

        /* Not handled */
        case GravityNotify:
            break;

        default:
            fgWarning ("Unknown X event type: %d\n", event.type);
            break;
        }
    }

#elif TARGET_HOST_MS_WINDOWS

    MSG stMsg;

    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMainLoopEvent" );

    while( PeekMessage( &stMsg, NULL, 0, 0, PM_NOREMOVE ) )
    {
        if( GetMessage( &stMsg, NULL, 0, 0 ) == 0 )
        {
            if( fgState.ActionOnWindowClose == GLUT_ACTION_EXIT )
            {
                fgDeinitialize( );
                exit( 0 );
            }
            else if( fgState.ActionOnWindowClose == GLUT_ACTION_GLUTMAINLOOP_RETURNS )
                fgState.ExecState = GLUT_EXEC_STATE_STOP;

            return;
        }

        TranslateMessage( &stMsg );
        DispatchMessage( &stMsg );
    }
#endif

    if( fgState.Timers.First )
        fghCheckTimers( );
    fghCheckJoystickPolls( );
    fghDisplayAll( );

    fgCloseWindows( );
}

/*
 * Enters the freeglut processing loop.
 * Stays until the "ExecState" changes to "GLUT_EXEC_STATE_STOP".
 */
void FGAPIENTRY glutMainLoop( void )
{
    int action;

#if TARGET_HOST_MS_WINDOWS
    SFG_Window *window = (SFG_Window *)fgStructure.Windows.First ;
#endif

    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMainLoop" );

#if TARGET_HOST_MS_WINDOWS
    /*
     * Processing before the main loop:  If there is a window which is open and
     * which has a visibility callback, call it.  I know this is an ugly hack,
     * but I'm not sure what else to do about it.  Ideally we should leave
     * something uninitialized in the create window code and initialize it in
     * the main loop, and have that initialization create a "WM_ACTIVATE"
     * message.  Then we would put the visibility callback code in the
     * "case WM_ACTIVATE" block below.         - John Fay -- 10/24/02
     */
    while( window )
    {
        if ( FETCH_WCB( *window, Visibility ) )
        {
            SFG_Window *current_window = fgStructure.CurrentWindow ;

            INVOKE_WCB( *window, Visibility, ( window->State.Visible ) );
            fgSetWindow( current_window );
        }

        window = (SFG_Window *)window->Node.Next ;
    }
#endif

    fgState.ExecState = GLUT_EXEC_STATE_RUNNING ;
    while( fgState.ExecState == GLUT_EXEC_STATE_RUNNING )
    {
        SFG_Window *window;

        glutMainLoopEvent( );
        /*
         * Step through the list of windows, seeing if there are any
         * that are not menus
         */
        for( window = ( SFG_Window * )fgStructure.Windows.First;
             window;
             window = ( SFG_Window * )window->Node.Next )
            if ( ! ( window->IsMenu ) )
                break;

        if( ! window )
            fgState.ExecState = GLUT_EXEC_STATE_STOP;
        else
        {
            if( fgState.IdleCallback )
            {
                if( fgStructure.CurrentWindow &&
                    fgStructure.CurrentWindow->IsMenu )
                    /* fail safe */
                    fgSetWindow( window );
                fgState.IdleCallback( );
            }

            fghSleepForEvents( );
        }
    }

    /*
     * When this loop terminates, destroy the display, state and structure
     * of a freeglut session, so that another glutInit() call can happen
     *
     * Save the "ActionOnWindowClose" because "fgDeinitialize" resets it.
     */
    action = fgState.ActionOnWindowClose;
    fgDeinitialize( );
    if( action == GLUT_ACTION_EXIT )
        exit( 0 );
}

/*
 * Leaves the freeglut processing loop.
 */
void FGAPIENTRY glutLeaveMainLoop( void )
{
    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutLeaveMainLoop" );
    fgState.ExecState = GLUT_EXEC_STATE_STOP ;
}


#if TARGET_HOST_MS_WINDOWS
/*
 * Determine a GLUT modifer mask based on MS-WINDOWS system info.
 */
static int fghGetWin32Modifiers (void)
{
    return
        ( ( ( GetKeyState( VK_LSHIFT   ) < 0 ) ||
            ( GetKeyState( VK_RSHIFT   ) < 0 )) ? GLUT_ACTIVE_SHIFT : 0 ) |
        ( ( ( GetKeyState( VK_LCONTROL ) < 0 ) ||
            ( GetKeyState( VK_RCONTROL ) < 0 )) ? GLUT_ACTIVE_CTRL  : 0 ) |
        ( ( ( GetKeyState( VK_LMENU    ) < 0 ) ||
            ( GetKeyState( VK_RMENU    ) < 0 )) ? GLUT_ACTIVE_ALT   : 0 );
}

/*
 * The window procedure for handling Win32 events
 */
LRESULT CALLBACK fgWindowProc( HWND hWnd, UINT uMsg, WPARAM wParam,
                               LPARAM lParam )
{
    SFG_Window* window;
    PAINTSTRUCT ps;
    LRESULT lRet = 1;

    FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Event Handler" ) ;

    window = fgWindowByHandle( hWnd );

    if ( ( window == NULL ) && ( uMsg != WM_CREATE ) )
      return DefWindowProc( hWnd, uMsg, wParam, lParam );

    /* printf ( "Window %3d message <%04x> %12d %12d\n", window?window->ID:0,
             uMsg, wParam, lParam ); */
    switch( uMsg )
    {
    case WM_CREATE:
        /* The window structure is passed as the creation structure paramter... */
        window = (SFG_Window *) (((LPCREATESTRUCT) lParam)->lpCreateParams);
        FREEGLUT_INTERNAL_ERROR_EXIT ( ( window != NULL ), "Cannot create window",
                                       "fgWindowProc" );

        window->Window.Handle = hWnd;
        window->Window.Device = GetDC( hWnd );
        if( window->IsMenu )
        {
            unsigned int current_DisplayMode = fgState.DisplayMode;
            fgState.DisplayMode = GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH;
#if !defined(_WIN32_WCE)
            fgSetupPixelFormat( window, GL_FALSE, PFD_MAIN_PLANE );
#endif
            fgState.DisplayMode = current_DisplayMode;

            if( fgStructure.MenuContext )
                wglMakeCurrent( window->Window.Device,
                                fgStructure.MenuContext->MContext
                );
            else
            {
                fgStructure.MenuContext =
                    (SFG_MenuContext *)malloc( sizeof(SFG_MenuContext) );
                fgStructure.MenuContext->MContext =
                    wglCreateContext( window->Window.Device );
            }

            /* window->Window.Context = wglGetCurrentContext ();   */
            window->Window.Context = wglCreateContext( window->Window.Device );
        }
        else
        {
#if !defined(_WIN32_WCE)
            fgSetupPixelFormat( window, GL_FALSE, PFD_MAIN_PLANE );
#endif

            if( ! fgState.UseCurrentContext )
                window->Window.Context =
                    wglCreateContext( window->Window.Device );
            else
            {
                window->Window.Context = wglGetCurrentContext( );
                if( ! window->Window.Context )
                    window->Window.Context =
                        wglCreateContext( window->Window.Device );
            }

#if !defined(_WIN32_WCE)
            fgNewWGLCreateContext( window );
#endif
        }

        window->State.NeedToResize = GL_TRUE;
        if( ( window->State.Width < 0 ) || ( window->State.Height < 0 ) )
        {
            SFG_Window *current_window = fgStructure.CurrentWindow;

            fgSetWindow( window );
            window->State.Width = glutGet( GLUT_WINDOW_WIDTH );
            window->State.Height = glutGet( GLUT_WINDOW_HEIGHT );
            fgSetWindow( current_window );
        }

        ReleaseDC( window->Window.Handle, window->Window.Device );

#if defined(_WIN32_WCE)
        /* Take over button handling */
        {
            HINSTANCE dxDllLib=LoadLibrary(_T("gx.dll"));
            if (dxDllLib)
            {
                GXGetDefaultKeys_=(GXGETDEFAULTKEYS)GetProcAddress(dxDllLib, _T("?GXGetDefaultKeys@@YA?AUGXKeyList@@H@Z"));
                GXOpenInput_=(GXOPENINPUT)GetProcAddress(dxDllLib, _T("?GXOpenInput@@YAHXZ"));
            }

            if(GXOpenInput_)
                (*GXOpenInput_)();
            if(GXGetDefaultKeys_)
                gxKeyList = (*GXGetDefaultKeys_)(GX_LANDSCAPEKEYS);
        }

#endif /* defined(_WIN32_WCE) */
        break;

    case WM_SIZE:
        /*
         * If the window is visible, then it is the user manually resizing it.
         * If it is not, then it is the system sending us a dummy resize with
         * zero dimensions on a "glutIconifyWindow" call.
         */
        if( window->State.Visible )
        {
            window->State.NeedToResize = GL_TRUE;
#if defined(_WIN32_WCE)
            window->State.Width  = HIWORD(lParam);
            window->State.Height = LOWORD(lParam);
#else
            window->State.Width  = LOWORD(lParam);
            window->State.Height = HIWORD(lParam);
#endif /* defined(_WIN32_WCE) */
        }

        break;

    case WM_SETFOCUS:
/*        printf("WM_SETFOCUS: %p\n", window ); */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        INVOKE_WCB( *window, Entry, ( GLUT_ENTERED ) );
        break;

    case WM_KILLFOCUS:
/*        printf("WM_KILLFOCUS: %p\n", window ); */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        INVOKE_WCB( *window, Entry, ( GLUT_LEFT ) );

        if( window->IsMenu &&
            window->ActiveMenu && window->ActiveMenu->IsActive )
            fgUpdateMenuHighlight( window->ActiveMenu );

        break;

#if 0
    case WM_ACTIVATE:
        if (LOWORD(wParam) != WA_INACTIVE)
        {
/*            printf("WM_ACTIVATE: fgSetCursor( %p, %d)\n", window,
                   window->State.Cursor ); */
            fgSetCursor( window, window->State.Cursor );
        }

        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;
#endif

    case WM_SETCURSOR:
/*      printf ( "Cursor event %x %x %x %x\n", window, window->State.Cursor, lParam, wParam ) ; */
        if( LOWORD( lParam ) == HTCLIENT )
            fgSetCursor ( window, window->State.Cursor ) ;
        else
            lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;

    case WM_SHOWWINDOW:
        window->State.Visible = GL_TRUE;
        window->State.Redisplay = GL_TRUE;
        break;

    case WM_PAINT:
        /* Turn on the visibility in case it was turned off somehow */
        window->State.Visible = GL_TRUE;
        BeginPaint( hWnd, &ps );
        fghRedrawWindow( window );
        EndPaint( hWnd, &ps );
        break;

    case WM_CLOSE:
        fgDestroyWindow ( window );
        if ( fgState.ActionOnWindowClose != GLUT_ACTION_CONTINUE_EXECUTION )
            PostQuitMessage(0);
        break;

    case WM_DESTROY:
        /*
         * The window already got destroyed, so don't bother with it.
         */
        return 0;

    case WM_MOUSEMOVE:
    {
#if defined(_WIN32_WCE)
        window->State.MouseX = 320-HIWORD( lParam );
        window->State.MouseY = LOWORD( lParam );
#else
        window->State.MouseX = LOWORD( lParam );
        window->State.MouseY = HIWORD( lParam );
#endif /* defined(_WIN32_WCE) */
        /* Restrict to [-32768, 32767] to match X11 behaviour       */
        /* See comment in "freeglut_developer" mailing list 10/4/04 */
        if ( window->State.MouseX > 32767 ) window->State.MouseX -= 65536;
        if ( window->State.MouseY > 32767 ) window->State.MouseY -= 65536;

        if ( window->ActiveMenu )
        {
            fgUpdateMenuHighlight( window->ActiveMenu );
            break;
        }

        fgState.Modifiers = fghGetWin32Modifiers( );

        if( ( wParam & MK_LBUTTON ) ||
            ( wParam & MK_MBUTTON ) ||
            ( wParam & MK_RBUTTON ) )
            INVOKE_WCB( *window, Motion, ( window->State.MouseX,
                                           window->State.MouseY ) );
        else
            INVOKE_WCB( *window, Passive, ( window->State.MouseX,
                                            window->State.MouseY ) );

        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break;

    case WM_LBUTTONDOWN:
    case WM_MBUTTONDOWN:
    case WM_RBUTTONDOWN:
    case WM_LBUTTONUP:
    case WM_MBUTTONUP:
    case WM_RBUTTONUP:
    {
        GLboolean pressed = GL_TRUE;
        int button;

#if defined(_WIN32_WCE)
        window->State.MouseX = 320-HIWORD( lParam );
        window->State.MouseY = LOWORD( lParam );
#else
        window->State.MouseX = LOWORD( lParam );
        window->State.MouseY = HIWORD( lParam );
#endif /* defined(_WIN32_WCE) */

        /* Restrict to [-32768, 32767] to match X11 behaviour       */
        /* See comment in "freeglut_developer" mailing list 10/4/04 */
        if ( window->State.MouseX > 32767 ) window->State.MouseX -= 65536;
        if ( window->State.MouseY > 32767 ) window->State.MouseY -= 65536;

        switch( uMsg )
        {
        case WM_LBUTTONDOWN:
            pressed = GL_TRUE;
            button = GLUT_LEFT_BUTTON;
            break;
        case WM_MBUTTONDOWN:
            pressed = GL_TRUE;
            button = GLUT_MIDDLE_BUTTON;
            break;
        case WM_RBUTTONDOWN:
            pressed = GL_TRUE;
            button = GLUT_RIGHT_BUTTON;
            break;
        case WM_LBUTTONUP:
            pressed = GL_FALSE;
            button = GLUT_LEFT_BUTTON;
            break;
        case WM_MBUTTONUP:
            pressed = GL_FALSE;
            button = GLUT_MIDDLE_BUTTON;
            break;
        case WM_RBUTTONUP:
            pressed = GL_FALSE;
            button = GLUT_RIGHT_BUTTON;
            break;
        default:
            pressed = GL_FALSE;
            button = -1;
            break;
        }

#if !defined(_WIN32_WCE)
        if( GetSystemMetrics( SM_SWAPBUTTON ) )
        {
            if( button == GLUT_LEFT_BUTTON )
                button = GLUT_RIGHT_BUTTON;
            else
                if( button == GLUT_RIGHT_BUTTON )
                    button = GLUT_LEFT_BUTTON;
        }
#endif /* !defined(_WIN32_WCE) */

        if( button == -1 )
            return DefWindowProc( hWnd, uMsg, lParam, wParam );

        /*
         * Do not execute the application's mouse callback if a menu
         * is hooked to this button.  In that case an appropriate
         * private call should be generated.
         */
        if( fgCheckActiveMenu( window, button, pressed,
                               window->State.MouseX, window->State.MouseY ) )
            break;

        /* Set capture so that the window captures all the mouse messages */
        /*
         * XXX - Multiple button support:  Under X11, the mouse is not released
         * XXX - from the window until all buttons have been released, even if the
         * XXX - user presses a button in another window.  This will take more
         * XXX - code changes than I am up to at the moment (10/5/04).  The present
         * XXX - is a 90 percent solution.
         */
        if ( pressed == GL_TRUE )
          SetCapture ( window->Window.Handle ) ;
        else
          ReleaseCapture () ;

        if( ! FETCH_WCB( *window, Mouse ) )
            break;

        fgSetWindow( window );
        fgState.Modifiers = fghGetWin32Modifiers( );

        INVOKE_WCB(
            *window, Mouse,
            ( button,
              pressed ? GLUT_DOWN : GLUT_UP,
              window->State.MouseX,
              window->State.MouseY
            )
        );

        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break;

    case 0x020a:
        /* Should be WM_MOUSEWHEEL but my compiler doesn't recognize it */
    {
        /*
         * XXX THIS IS SPECULATIVE -- John Fay, 10/2/03
         * XXX Should use WHEEL_DELTA instead of 120
         */
        int wheel_number = LOWORD( wParam );
        short ticks = ( short )HIWORD( wParam ) / 120;
        int direction = 1;

        if( ticks < 0 )
        {
            direction = -1;
            ticks = -ticks;
        }

        /*
         * The mouse cursor has moved. Remember the new mouse cursor's position
         */
        /*        window->State.MouseX = LOWORD( lParam ); */
        /* Need to adjust by window position, */
        /*        window->State.MouseY = HIWORD( lParam ); */
        /* change "lParam" to other parameter */

        if( ! FETCH_WCB( *window, MouseWheel ) &&
            ! FETCH_WCB( *window, Mouse ) )
            break;

        fgSetWindow( window );
        fgState.Modifiers = fghGetWin32Modifiers( );

        while( ticks-- )
            if( FETCH_WCB( *window, MouseWheel ) )
                INVOKE_WCB( *window, MouseWheel,
                            ( wheel_number,
                              direction,
                              window->State.MouseX,
                              window->State.MouseY
                            )
                );
            else  /* No mouse wheel, call the mouse button callback twice */
            {
                /*
                 * Map wheel zero to button 3 and 4; +1 to 3, -1 to 4
                 *  "    "   one                     +1 to 5, -1 to 6, ...
                 *
                 * XXX The below assumes that you have no more than 3 mouse
                 * XXX buttons.  Sorry.
                 */
                int button = wheel_number * 2 + 3;
                if( direction < 0 )
                    ++button;
                INVOKE_WCB( *window, Mouse,
                            ( button, GLUT_DOWN,
                              window->State.MouseX, window->State.MouseY )
                );
                INVOKE_WCB( *window, Mouse,
                            ( button, GLUT_UP,
                              window->State.MouseX, window->State.MouseY )
                );
            }

        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break ;

    case WM_SYSKEYDOWN:
    case WM_KEYDOWN:
    {
        int keypress = -1;
        POINT mouse_pos ;

        if( ( fgState.KeyRepeat==GLUT_KEY_REPEAT_OFF || window->State.IgnoreKeyRepeat==GL_TRUE ) && (HIWORD(lParam) & KF_REPEAT) )
            break;

        /*
         * Remember the current modifiers state. This is done here in order
         * to make sure the VK_DELETE keyboard callback is executed properly.
         */
        fgState.Modifiers = fghGetWin32Modifiers( );

        GetCursorPos( &mouse_pos );
        ScreenToClient( window->Window.Handle, &mouse_pos );

        window->State.MouseX = mouse_pos.x;
        window->State.MouseY = mouse_pos.y;

        /* Convert the Win32 keystroke codes to GLUTtish way */
#       define KEY(a,b) case a: keypress = b; break;

        switch( wParam )
        {
            KEY( VK_F1,     GLUT_KEY_F1        );
            KEY( VK_F2,     GLUT_KEY_F2        );
            KEY( VK_F3,     GLUT_KEY_F3        );
            KEY( VK_F4,     GLUT_KEY_F4        );
            KEY( VK_F5,     GLUT_KEY_F5        );
            KEY( VK_F6,     GLUT_KEY_F6        );
            KEY( VK_F7,     GLUT_KEY_F7        );
            KEY( VK_F8,     GLUT_KEY_F8        );
            KEY( VK_F9,     GLUT_KEY_F9        );
            KEY( VK_F10,    GLUT_KEY_F10       );
            KEY( VK_F11,    GLUT_KEY_F11       );
            KEY( VK_F12,    GLUT_KEY_F12       );
            KEY( VK_PRIOR,  GLUT_KEY_PAGE_UP   );
            KEY( VK_NEXT,   GLUT_KEY_PAGE_DOWN );
            KEY( VK_HOME,   GLUT_KEY_HOME      );
            KEY( VK_END,    GLUT_KEY_END       );
            KEY( VK_LEFT,   GLUT_KEY_LEFT      );
            KEY( VK_UP,     GLUT_KEY_UP        );
            KEY( VK_RIGHT,  GLUT_KEY_RIGHT     );
            KEY( VK_DOWN,   GLUT_KEY_DOWN      );
            KEY( VK_INSERT, GLUT_KEY_INSERT    );

        case VK_DELETE:
            /* The delete key should be treated as an ASCII keypress: */
            INVOKE_WCB( *window, Keyboard,
                        ( 127, window->State.MouseX, window->State.MouseY )
            );
        }

#if defined(_WIN32_WCE)
        if(!(lParam & 0x40000000)) /* Prevent auto-repeat */
        {
            if(wParam==(unsigned)gxKeyList.vkRight)
                keypress = GLUT_KEY_RIGHT;
            else if(wParam==(unsigned)gxKeyList.vkLeft)
                keypress = GLUT_KEY_LEFT;
            else if(wParam==(unsigned)gxKeyList.vkUp)
                keypress = GLUT_KEY_UP;
            else if(wParam==(unsigned)gxKeyList.vkDown)
                keypress = GLUT_KEY_DOWN;
            else if(wParam==(unsigned)gxKeyList.vkA)
                keypress = GLUT_KEY_F1;
            else if(wParam==(unsigned)gxKeyList.vkB)
                keypress = GLUT_KEY_F2;
            else if(wParam==(unsigned)gxKeyList.vkC)
                keypress = GLUT_KEY_F3;
            else if(wParam==(unsigned)gxKeyList.vkStart)
                keypress = GLUT_KEY_F4;
        }
#endif

        if( keypress != -1 )
            INVOKE_WCB( *window, Special,
                        ( keypress,
                          window->State.MouseX, window->State.MouseY )
            );

        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break;

    case WM_SYSKEYUP:
    case WM_KEYUP:
    {
        int keypress = -1;
        POINT mouse_pos;

        /*
         * Remember the current modifiers state. This is done here in order
         * to make sure the VK_DELETE keyboard callback is executed properly.
         */
        fgState.Modifiers = fghGetWin32Modifiers( );

        GetCursorPos( &mouse_pos );
        ScreenToClient( window->Window.Handle, &mouse_pos );

        window->State.MouseX = mouse_pos.x;
        window->State.MouseY = mouse_pos.y;

        /*
         * Convert the Win32 keystroke codes to GLUTtish way.
         * "KEY(a,b)" was defined under "WM_KEYDOWN"
         */

        switch( wParam )
        {
            KEY( VK_F1,     GLUT_KEY_F1        );
            KEY( VK_F2,     GLUT_KEY_F2        );
            KEY( VK_F3,     GLUT_KEY_F3        );
            KEY( VK_F4,     GLUT_KEY_F4        );
            KEY( VK_F5,     GLUT_KEY_F5        );
            KEY( VK_F6,     GLUT_KEY_F6        );
            KEY( VK_F7,     GLUT_KEY_F7        );
            KEY( VK_F8,     GLUT_KEY_F8        );
            KEY( VK_F9,     GLUT_KEY_F9        );
            KEY( VK_F10,    GLUT_KEY_F10       );
            KEY( VK_F11,    GLUT_KEY_F11       );
            KEY( VK_F12,    GLUT_KEY_F12       );
            KEY( VK_PRIOR,  GLUT_KEY_PAGE_UP   );
            KEY( VK_NEXT,   GLUT_KEY_PAGE_DOWN );
            KEY( VK_HOME,   GLUT_KEY_HOME      );
            KEY( VK_END,    GLUT_KEY_END       );
            KEY( VK_LEFT,   GLUT_KEY_LEFT      );
            KEY( VK_UP,     GLUT_KEY_UP        );
            KEY( VK_RIGHT,  GLUT_KEY_RIGHT     );
            KEY( VK_DOWN,   GLUT_KEY_DOWN      );
            KEY( VK_INSERT, GLUT_KEY_INSERT    );

          case VK_DELETE:
              /* The delete key should be treated as an ASCII keypress: */
              INVOKE_WCB( *window, KeyboardUp,
                          ( 127, window->State.MouseX, window->State.MouseY )
              );
              break;

        default:
        {
#if !defined(_WIN32_WCE)
            BYTE state[ 256 ];
            WORD code[ 2 ];

            GetKeyboardState( state );

            if( ToAscii( (UINT)wParam, 0, state, code, 0 ) == 1 )
                wParam=code[ 0 ];

            INVOKE_WCB( *window, KeyboardUp,
                        ( (char)wParam,
                          window->State.MouseX, window->State.MouseY )
            );
#endif /* !defined(_WIN32_WCE) */
        }
        }

        if( keypress != -1 )
            INVOKE_WCB( *window, SpecialUp,
                        ( keypress,
                          window->State.MouseX, window->State.MouseY )
            );

        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break;

    case WM_SYSCHAR:
    case WM_CHAR:
    {
      if( (fgState.KeyRepeat==GLUT_KEY_REPEAT_OFF || window->State.IgnoreKeyRepeat==GL_TRUE) && (HIWORD(lParam) & KF_REPEAT) )
            break;

        fgState.Modifiers = fghGetWin32Modifiers( );
        INVOKE_WCB( *window, Keyboard,
                    ( (char)wParam,
                      window->State.MouseX, window->State.MouseY )
        );
        fgState.Modifiers = INVALID_MODIFIERS;
    }
    break;

    case WM_CAPTURECHANGED:
        /* User has finished resizing the window, force a redraw */
        INVOKE_WCB( *window, Display, ( ) );

        /*lRet = DefWindowProc( hWnd, uMsg, wParam, lParam ); */
        break;

        /* Other messages that I have seen and which are not handled already */
    case WM_SETTEXT:  /* 0x000c */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        /* Pass it on to "DefWindowProc" to set the window text */
        break;

    case WM_GETTEXT:  /* 0x000d */
        /* Ideally we would copy the title of the window into "lParam" */
        /* strncpy ( (char *)lParam, "Window Title", wParam );
           lRet = ( wParam > 12 ) ? 12 : wParam;  */
        /* the number of characters copied */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;

    case WM_GETTEXTLENGTH:  /* 0x000e */
        /* Ideally we would get the length of the title of the window */
        lRet = 12;
        /* the number of characters in "Window Title\0" (see above) */
        break;

    case WM_ERASEBKGND:  /* 0x0014 */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;

#if !defined(_WIN32_WCE)
    case WM_SYNCPAINT:  /* 0x0088 */
        /* Another window has moved, need to update this one */
        window->State.Redisplay = GL_TRUE;
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        /* Help screen says this message must be passed to "DefWindowProc" */
        break;

    case WM_NCPAINT:  /* 0x0085 */
      /* Need to update the border of this window */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        /* Pass it on to "DefWindowProc" to repaint a standard border */
        break;

    case WM_SYSCOMMAND :  /* 0x0112 */
        {
          /*
           * We have received a system command message.  Try to act on it.
           * The commands are passed in through the "wParam" parameter:
           * The least significant digit seems to be which edge of the window
           * is being used for a resize event:
           *     4  3  5
           *     1     2
           *     7  6  8
           * Congratulations and thanks to Richard Rauch for figuring this out..
           */
            switch ( wParam & 0xfff0 )
            {
            case SC_SIZE       :
                break ;

            case SC_MOVE       :
                break ;

            case SC_MINIMIZE   :
                /* User has clicked on the "-" to minimize the window */
                /* Turn off the visibility */
                window->State.Visible = GL_FALSE ;

                break ;

            case SC_MAXIMIZE   :
                break ;

            case SC_NEXTWINDOW :
                break ;

            case SC_PREVWINDOW :
                break ;

            case SC_CLOSE      :
                /* Followed very closely by a WM_CLOSE message */
                break ;

            case SC_VSCROLL    :
                break ;

            case SC_HSCROLL    :
                break ;

            case SC_MOUSEMENU  :
                break ;

            case SC_KEYMENU    :
                break ;

            case SC_ARRANGE    :
                break ;

            case SC_RESTORE    :
                break ;

            case SC_TASKLIST   :
                break ;

            case SC_SCREENSAVE :
                break ;

            case SC_HOTKEY     :
                break ;

#if(WINVER >= 0x0400)
            case SC_DEFAULT    :
                break ;

            case SC_MONITORPOWER    :
                break ;

            case SC_CONTEXTHELP    :
                break ;
#endif /* WINVER >= 0x0400 */

            default:
#if _DEBUG
                fgWarning( "Unknown wParam type 0x%x", wParam );
#endif
                break;
            }
        }
#endif /* !defined(_WIN32_WCE) */

        /* We need to pass the message on to the operating system as well */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;

    default:
        /* Handle unhandled messages */
        lRet = DefWindowProc( hWnd, uMsg, wParam, lParam );
        break;
    }

    return lRet;
}
#endif

/*** END OF FILE ***/
