--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/x11/fg_main_x11.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,1460 @@
+/*
+ * fg_main_x11.c
+ *
+ * The X11-specific windows message processing methods.
+ *
+ * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
+ * Written by Pawel W. Olszta, <olszta@sourceforge.net>
+ * Copied for Platform code by Evan Felix <karcaw at gmail.com>
+ * Creation date: Thur Feb 2 2012
+ *
+ * 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 <GL/freeglut.h>
+#include "../fg_internal.h"
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <sys/select.h>
+
+/*
+ * Try to get the maximum value allowed for ints, falling back to the minimum
+ * guaranteed by ISO C99 if there is no suitable header.
+ */
+#ifdef 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
+
+extern void fghOnReshapeNotify(SFG_Window *window, int width, int height, GLboolean forceNotify);
+extern void fghOnPositionNotify(SFG_Window *window, int x, int y, GLboolean forceNotify);
+extern void fgPlatformFullScreenToggle( SFG_Window *win );
+extern void fgPlatformPositionWindow( SFG_Window *window, int x, int y );
+extern void fgPlatformReshapeWindow ( SFG_Window *window, int width, int height );
+extern void fgPlatformPushWindow( SFG_Window *window );
+extern void fgPlatformPopWindow( SFG_Window *window );
+extern void fgPlatformHideWindow( SFG_Window *window );
+extern void fgPlatformIconifyWindow( SFG_Window *window );
+extern void fgPlatformShowWindow( SFG_Window *window );
+
+/* used in the event handling code to match and discard stale mouse motion events */
+static Bool match_motion(Display *dpy, XEvent *xev, XPointer arg);
+
+/*
+ * TODO BEFORE THE STABLE RELEASE:
+ *
+ * There are some issues concerning window redrawing under X11, and maybe
+ * some events are not handled.
+ *
+ * Need to investigate why the X11 version breaks out with an error when
+ * closing a window (using the window manager, not glutDestroyWindow)...
+ */
+ 
+ 
+
+fg_time_t fgPlatformSystemTime ( void )
+{
+#ifdef CLOCK_MONOTONIC
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    return now.tv_nsec/1000000 + now.tv_sec*1000;
+#elif defined(HAVE_GETTIMEOFDAY)
+    struct timeval now;
+    gettimeofday( &now, NULL );
+    return now.tv_usec/1000 + now.tv_sec*1000;
+#endif
+}
+
+/*
+ * Does the magic required to relinquish the CPU until something interesting
+ * happens.
+ */
+
+void fgPlatformSleepForEvents( fg_time_t msec )
+{
+    /*
+     * 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.pDisplay.Display ) )
+    {
+        fd_set fdset;
+        int err;
+        int socket;
+        struct timeval wait;
+
+        socket = ConnectionNumber( fgDisplay.pDisplay.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( ( -1 == err ) && ( errno != EINTR ) )
+            fgWarning ( "freeglut select() error: %d", errno );
+    }
+}
+
+
+/*
+ * Returns GLUT modifier mask for the state field of an X11 event.
+ */
+int fgPlatformGetModifiers( 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;
+}
+
+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";
+    }
+}
+
+__fg_unused 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;
+    }
+    }
+}
+
+/* UTF-8 decoding routine */
+enum
+{
+    Runeerror = 0xFFFD, /* decoding error in UTF */
+
+    Bit1 = 7,
+    Bitx = 6,
+    Bit2 = 5,
+    Bit3 = 4,
+    Bit4 = 3,
+    Bit5 = 2,
+
+    T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */
+    Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */
+    T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */
+    T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */
+    T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */
+    T5 = ((1<<(Bit5+1))-1) ^ 0xFF, /* 1111 1000 */
+
+    Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0111 1111 */
+    Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0111 1111 1111 */
+    Rune3 = (1<<(Bit3+2*Bitx))-1, /* 1111 1111 1111 1111 */
+    Rune4 = (1<<(Bit4+3*Bitx))-1, /* 0001 1111 1111 1111 1111 1111 */
+
+    Maskx = (1<<Bitx)-1,	/* 0011 1111 */
+    Testx = Maskx ^ 0xFF,	/* 1100 0000 */
+
+    Bad = Runeerror,
+};
+
+static int chartorune(int *rune, const char *str)
+{
+    int c, c1, c2, c3;
+    int l;
+
+    /*
+     * one character sequence
+     *	00000-0007F => T1
+     */
+    c = *(const unsigned char*)str;
+    if(c < Tx) {
+        *rune = c;
+        return 1;
+    }
+
+    /*
+     * two character sequence
+     *	0080-07FF => T2 Tx
+     */
+    c1 = *(const unsigned char*)(str+1) ^ Tx;
+    if(c1 & Testx)
+        goto bad;
+    if(c < T3) {
+        if(c < T2)
+            goto bad;
+        l = ((c << Bitx) | c1) & Rune2;
+        if(l <= Rune1)
+            goto bad;
+        *rune = l;
+        return 2;
+    }
+
+    /*
+     * three character sequence
+     *	0800-FFFF => T3 Tx Tx
+     */
+    c2 = *(const unsigned char*)(str+2) ^ Tx;
+    if(c2 & Testx)
+        goto bad;
+    if(c < T4) {
+        l = ((((c << Bitx) | c1) << Bitx) | c2) & Rune3;
+        if(l <= Rune2)
+            goto bad;
+        *rune = l;
+        return 3;
+    }
+
+    /*
+     * four character sequence (21-bit value)
+     *	10000-1FFFFF => T4 Tx Tx Tx
+     */
+    c3 = *(const unsigned char*)(str+3) ^ Tx;
+    if (c3 & Testx)
+        goto bad;
+    if (c < T5) {
+        l = ((((((c << Bitx) | c1) << Bitx) | c2) << Bitx) | c3) & Rune4;
+        if (l <= Rune3)
+            goto bad;
+        *rune = l;
+        return 4;
+    }
+    /*
+     * Support for 5-byte or longer UTF-8 would go here, but
+     * since we don't have that, we'll just fall through to bad.
+     */
+
+    /*
+     * bad decoding
+     */
+bad:
+    *rune = Bad;
+    return 1;
+}
+
+extern char *fgClipboardBuffer[3];
+
+static Atom fghGetAtom(const char *name)
+{
+    return XInternAtom(fgDisplay.pDisplay.Display, name, False);
+}
+
+static void fgHandleSelectionNotify(XEvent *event)
+{
+    Display *dpy = fgDisplay.pDisplay.Display;
+    Atom actual_type;
+    int actual_format;
+    unsigned long item_count;
+    unsigned long bytes_after;
+    unsigned char *prop;
+
+    if (event->xselection.property == None)
+    {
+        fgWarning("Couldn't convert selection to UTF-8 string.");
+        return;
+    }
+
+    XGetWindowProperty(dpy, event->xselection.requestor, event->xselection.property,
+            0, LONG_MAX, True, AnyPropertyType,
+            &actual_type, &actual_format, &item_count, &bytes_after, &prop);
+
+    if (actual_type == fghGetAtom("UTF8_STRING"))
+    {
+        if (event->xselection.selection == fghGetAtom("CLIPBOARD"))
+        {
+            free(fgClipboardBuffer[GLUT_CLIPBOARD]);
+            fgClipboardBuffer[GLUT_CLIPBOARD] = strdup((char*)prop);
+        }
+        if (event->xselection.selection == XA_PRIMARY)
+        {
+            free(fgClipboardBuffer[GLUT_PRIMARY]);
+            fgClipboardBuffer[GLUT_PRIMARY] = strdup((char*)prop);
+        }
+        if (event->xselection.selection == XA_SECONDARY)
+        {
+            free(fgClipboardBuffer[GLUT_SECONDARY]);
+            fgClipboardBuffer[GLUT_SECONDARY] = strdup((char*)prop);
+        }
+    }
+
+    XFree(prop);
+}
+
+static void fgHandleSelectionClear(XEvent *event)
+{
+    if (event->xselectionclear.selection == fghGetAtom("CLIPBOARD"))
+    {
+        free(fgClipboardBuffer[GLUT_CLIPBOARD]);
+        fgClipboardBuffer[GLUT_CLIPBOARD] = NULL;
+    }
+    else if (event->xselectionclear.selection == XA_PRIMARY)
+    {
+        free(fgClipboardBuffer[GLUT_PRIMARY]);
+        fgClipboardBuffer[GLUT_PRIMARY] = NULL;
+    }
+    else if (event->xselectionclear.selection == XA_SECONDARY)
+    {
+        free(fgClipboardBuffer[GLUT_SECONDARY]);
+        fgClipboardBuffer[GLUT_SECONDARY] = NULL;
+    }
+}
+
+static void fgHandleSelectionRequest(XEvent *event)
+{
+    Display *dpy = fgDisplay.pDisplay.Display;
+    Window requestor = event->xselectionrequest.requestor;
+    Atom selection = event->xselectionrequest.selection;
+    Atom target = event->xselectionrequest.target;
+    Atom property = event->xselectionrequest.property;
+    Atom time = event->xselectionrequest.time;
+    XEvent response;
+    char *text;
+
+    if (property == None)
+        property = target;
+
+    response.xselection.type = SelectionNotify;
+    response.xselection.send_event = True;
+    response.xselection.display = dpy;
+    response.xselection.requestor = requestor;
+    response.xselection.selection = selection;
+    response.xselection.target = target;
+    response.xselection.property = property;
+    response.xselection.time = time;
+
+    if (selection == fghGetAtom("CLIPBOARD"))
+        text = fgClipboardBuffer[GLUT_CLIPBOARD];
+    else if (selection == XA_PRIMARY)
+        text = fgClipboardBuffer[GLUT_PRIMARY];
+    else if (selection == XA_SECONDARY)
+        text = fgClipboardBuffer[GLUT_SECONDARY];
+    else
+        return;
+    if (!text)
+        return;
+
+    if (target == fghGetAtom("TARGETS"))
+    {
+        Atom list[4] = {
+            fghGetAtom("TARGETS"),
+            fghGetAtom("TIMESTAMP"),
+            XA_STRING,
+            fghGetAtom("UTF8_STRING")
+        };
+        XChangeProperty(dpy, requestor, property, target,
+                32, PropModeReplace, (unsigned char *)list, sizeof(list)/sizeof(Atom));
+    }
+    else if (target == XA_STRING || target == fghGetAtom("UTF8_STRING"))
+    {
+        XChangeProperty(dpy, requestor, property, target,
+                8, PropModeReplace, (unsigned char *)text, strlen(text));
+    }
+
+    XSendEvent(dpy, requestor, False, 0, &response);
+}
+
+void fgPlatformSetClipboard(int selection, const char *text)
+{
+    Display *dpy = fgDisplay.pDisplay.Display;
+    Window window = fgStructure.CurrentWindow->Window.Handle;
+    Atom xselection;
+    if (selection == GLUT_CLIPBOARD)
+        xselection = fghGetAtom("CLIPBOARD");
+    else if (selection == GLUT_PRIMARY)
+        xselection = XA_PRIMARY;
+    else if (selection == GLUT_SECONDARY)
+        xselection = XA_SECONDARY;
+    else
+        return;
+
+    free(fgClipboardBuffer[selection]);
+    fgClipboardBuffer[selection] = strdup(text);
+
+    XSetSelectionOwner(dpy, xselection, window, CurrentTime);
+}
+
+static Bool isSelectionNotify(Display *dpi, XEvent *event, XPointer arg)
+{
+    return (event->type == SelectionNotify);
+}
+
+const char *fgPlatformGetClipboard(int selection)
+{
+    Display *dpy = fgDisplay.pDisplay.Display;
+    Window window = fgStructure.CurrentWindow->Window.Handle;
+    Atom xselection;
+    Window owner;
+    XEvent event;
+
+    if (selection == GLUT_CLIPBOARD)
+        xselection = fghGetAtom("CLIPBOARD");
+    else if (selection == GLUT_PRIMARY)
+        xselection = XA_PRIMARY;
+    else if (selection == GLUT_SECONDARY)
+        xselection = XA_SECONDARY;
+    else
+        return NULL;
+
+    owner = XGetSelectionOwner(dpy, xselection);
+    if (!owner)
+        return NULL;
+    if (owner != window)
+    {
+        XConvertSelection(dpy, xselection, fghGetAtom("UTF8_STRING"), xselection, window, CurrentTime);
+        XIfEvent(dpy, &event, isSelectionNotify, NULL);
+        fgHandleSelectionNotify(&event);
+    }
+
+    return fgClipboardBuffer[selection];
+}
+
+void fgPlatformProcessSingleEvent ( void )
+{
+    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.pDisplay.Display ) )
+    {
+        XNextEvent( fgDisplay.pDisplay.Display, &event );
+#if _DEBUG
+        fghPrintEvent( &event );
+#endif
+	if (XFilterEvent(&event, None))
+		continue;
+
+        switch( event.type )
+        {
+        case ClientMessage:
+            if (fgStructure.CurrentWindow)
+                if(fgIsSpaceballXEvent(&event)) {
+                    fgSpaceballHandleXEvent(&event);
+                    break;
+                }
+            /* Destroy the window when the WM_DELETE_WINDOW message arrives */
+            if( (Atom) event.xclient.data.l[ 0 ] == fgDisplay.pDisplay.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;
+
+        case SelectionClear:
+            fgHandleSelectionClear(&event);
+            break;
+        case SelectionRequest:
+            fgHandleSelectionRequest(&event);
+            break;
+        case SelectionNotify:
+            fgHandleSelectionNotify(&event);
+            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, x, y;
+                if( event.type == CreateNotify ) {
+                    GETWINDOW( xcreatewindow );
+                    width = event.xcreatewindow.width;
+                    height = event.xcreatewindow.height;
+                    x = event.xcreatewindow.x;
+                    y = event.xcreatewindow.y;
+                } else {
+                    GETWINDOW( xconfigure );
+                    width = event.xconfigure.width;
+                    height = event.xconfigure.height;
+                    x = event.xconfigure.x;
+                    y = event.xconfigure.y;
+                }
+
+                /* Update state and call callback, if there was a change */
+                fghOnPositionNotify(window, x, y, GL_FALSE);
+                /* Update state and call callback, if there was a change */
+                fghOnReshapeNotify(window, width, height, GL_FALSE);
+            }
+            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.WorkMask |= GLUT_DISPLAY_WORK;
+            }
+            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:
+        {
+            /* if GLUT_SKIP_STALE_MOTION_EVENTS is true, then discard all but
+             * the last motion event from the queue
+             */
+            if(fgState.SkipStaleMotion) {
+                while(XCheckIfEvent(fgDisplay.pDisplay.Display, &event, match_motion, 0));
+            }
+
+            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 = fgPlatformGetModifiers( 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, event.xbutton.y ) )
+                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 = fgPlatformGetModifiers( 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 decremented
+                 * XXX in mapping from X button numbering to GLUT.
+				 *
+				 * XXX Should add support for partial wheel turns as Windows does -- 5/27/11
+                 */
+                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:
+        {
+            FGCBKeyboardExt keyboard_ext_cb;
+            FGCBKeyboard keyboard_cb, keyboard_low_cb;
+            FGCBSpecial special_cb;
+            int did_keyboard_cb = 0;
+
+            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.pDisplay.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.pWState.KeyRepeating = GL_TRUE;
+                        else
+                            window->State.pWState.KeyRepeating = GL_FALSE;
+                    }
+                }
+            }
+            else
+                window->State.pWState.KeyRepeating = GL_FALSE;
+
+            /* Cease processing this event if it is auto repeated */
+
+            if (window->State.pWState.KeyRepeating)
+            {
+                if (event.type == KeyPress) window->State.pWState.KeyRepeating = GL_FALSE;
+                break;
+            }
+
+            if( event.type == KeyPress )
+            {
+                keyboard_ext_cb = (FGCBKeyboardExt)( FETCH_WCB( *window, KeyboardExt ));
+                keyboard_low_cb = (FGCBKeyboard)( FETCH_WCB( *window, KeyboardDown ));
+                keyboard_cb = (FGCBKeyboard)( FETCH_WCB( *window, Keyboard ));
+                special_cb  = (FGCBSpecial) ( FETCH_WCB( *window, Special  ));
+            }
+            else
+            {
+                keyboard_ext_cb = NULL;
+                keyboard_low_cb = (FGCBKeyboard)( FETCH_WCB( *window, KeyboardUp ));
+                keyboard_cb = NULL;
+                special_cb  = (FGCBSpecial) ( FETCH_WCB( *window, SpecialUp  ));
+            }
+
+            /* Is there a character keyboard callback hooked for this window? */
+            if (keyboard_ext_cb || keyboard_cb)
+            {
+                static XComposeStatus composeStatus = { 0 }; /* keep state across invocations */
+                XIC ic = window->Window.pContext.IC;
+                Status status;
+                char buf[32], *utf8 = buf;
+                KeySym keySym;
+                int i, c, len;
+
+                /* Check for the Unicode text associated with the event: */
+                if (ic)
+                {
+                    len = Xutf8LookupString(ic, &event.xkey, buf, sizeof buf, &keySym, &status);
+                    if (status == XBufferOverflow)
+                    {
+                        utf8 = malloc(len);
+                        len = Xutf8LookupString(ic, &event.xkey, utf8, len, &keySym, &status);
+                    }
+                }
+                else
+                {
+                    len = XLookupString(&event.xkey, buf, sizeof buf, &keySym, &composeStatus);
+                }
+
+                if (len > 0)
+                {
+                    fgSetWindow(window);
+                    fgState.Modifiers = fgPlatformGetModifiers(event.xkey.state);
+
+                    i = 0;
+                    while (i < len)
+                    {
+                        i += chartorune(&c, utf8 + i);
+
+                        /* ...for the Unicode translateable keypresses... */
+                        if (keyboard_ext_cb)
+                            keyboard_ext_cb(c, event.xkey.x, event.xkey.y);
+
+                        /* ...for the Latin-1 translateable keypresses... */
+                        if (keyboard_cb)
+                            if (c < 256)
+                                keyboard_cb(c, event.xkey.x, event.xkey.y);
+                    }
+
+                    fgState.Modifiers = INVALID_MODIFIERS;
+
+                    did_keyboard_cb = 1;
+                }
+
+                if (utf8 != buf)
+                    free(utf8);
+            }
+
+            /* Is there a low-level keyboard callback hooked for this window? */
+            if (keyboard_low_cb || special_cb)
+            {
+                int special = -1;
+                int ascii = 0;
+
+                KeySym keySym = XLookupKeysym(&event.xkey, 0);
+
+                /* ...for low-level keys, which need to be
+                 * translated to GLUT_KEY_Xs or ASCII values...
+                 */
+                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;
+
+                case XK_Shift_L:   special = GLUT_KEY_SHIFT_L;    break;
+                case XK_Shift_R:   special = GLUT_KEY_SHIFT_R;    break;
+                case XK_Control_L: special = GLUT_KEY_CTRL_L;     break;
+                case XK_Control_R: special = GLUT_KEY_CTRL_R;     break;
+                case XK_Alt_L:     special = GLUT_KEY_ALT_L;      break;
+                case XK_Alt_R:     special = GLUT_KEY_ALT_R;      break;
+                default:
+                    if( keySym >= XK_space && keySym <= XK_ydiaeresis )
+                        ascii = keySym;
+                    break;
+                }
+
+                /*
+                 * Execute the callback (if one has been specified),
+                 * given that the special code seems to be valid...
+                 * But only if we haven't already sent translated text for it,
+                 * such as numeric keypad keys with numlock on.
+                 */
+                if( special_cb && (special != -1) && !did_keyboard_cb )
+                {
+                    fgSetWindow( window );
+                    fgState.Modifiers = fgPlatformGetModifiers( event.xkey.state );
+                    special_cb( special, event.xkey.x, event.xkey.y );
+                    fgState.Modifiers = INVALID_MODIFIERS;
+                }
+                else if( keyboard_low_cb && (ascii >= 32 && ascii < 256) )
+                {
+                    fgSetWindow( window );
+                    fgState.Modifiers = fgPlatformGetModifiers( event.xkey.state );
+                    keyboard_low_cb( ascii, 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:
+            /* enter handling of Extension Events here */
+            #ifdef HAVE_X11_EXTENSIONS_XINPUT2_H
+                fgHandleExtensionEvents( &event );
+            #endif
+            break;
+        }
+    }
+}
+
+
+static Bool match_motion(Display *dpy, XEvent *xev, XPointer arg)
+{
+    return xev->type == MotionNotify;
+}
+
+void fgPlatformMainLoopPreliminaryWork ( void )
+{
+}
+
+
+/* deal with work list items */
+void fgPlatformInitWork(SFG_Window* window)
+{
+    /* Notify windowStatus/visibility, position and size get notified on window creation with message handlers above 
+     * XXX CHECK: do the messages happen too early like on windows, so client code cannot have registered
+     * a callback yet and the message is thus never received by client?
+     * -> this is a no-op
+     */
+     return;
+}
+
+void fgPlatformPosResZordWork(SFG_Window* window, unsigned int workMask)
+{
+    if (workMask & GLUT_FULL_SCREEN_WORK)
+        fgPlatformFullScreenToggle( window );
+    if (workMask & GLUT_POSITION_WORK)
+        fgPlatformPositionWindow( window, window->State.DesiredXpos, window->State.DesiredYpos );
+    if (workMask & GLUT_SIZE_WORK)
+        fgPlatformReshapeWindow ( window, window->State.DesiredWidth, window->State.DesiredHeight );
+    if (workMask & GLUT_ZORDER_WORK)
+    {
+        if (window->State.DesiredZOrder < 0)
+            fgPlatformPushWindow( window );
+        else
+            fgPlatformPopWindow( window );
+    }
+}
+
+void fgPlatformVisibilityWork(SFG_Window* window)
+{
+    /* Visibility status of window gets updated in the window message handlers above 
+     * XXX: is this really the case? check
+     */
+    SFG_Window *win = window;
+    switch (window->State.DesiredVisibility)
+    {
+    case DesireHiddenState:
+        fgPlatformHideWindow( window );
+        break;
+    case DesireIconicState:
+        /* Call on top-level window */
+        while (win->Parent)
+            win = win->Parent;
+        fgPlatformIconifyWindow( win );
+        break;
+    case DesireNormalState:
+        fgPlatformShowWindow( window );
+        break;
+    }
+}
+