--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/fg_menu.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,1054 @@
+/*
+ * fg_menu.c
+ *
+ * Pull-down menu creation and handling.
+ *
+ * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
+ * Written by Pawel W. Olszta, <olszta@sourceforge.net>
+ * Creation date: Thu Dec 16 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.
+ */
+
+#define FREEGLUT_BUILDING_LIB
+#include <GL/freeglut.h>
+#include "fg_internal.h"
+
+
+/* -- DEFINITIONS ---------------------------------------------------------- */
+
+/*
+ * FREEGLUT_MENU_FONT can be any freeglut bitmapped font.
+ * (Stroked fonts would not be out of the question, but we'd need to alter
+ *  code, since GLUT (hence freeglut) does not quite unify stroked and
+ *  bitmapped font handling.)
+ * Old UNIX/X11 GLUT (BSD, UNIX, IRIX, LINUX, HPUX, ...) used a system
+ * font best approximated by an 18-pixel HELVETICA, I think.  MS-WINDOWS
+ * GLUT used something closest to the 8x13 fixed-width font.  (Old
+ * GLUT apparently uses host-system menus rather than building its own.
+ * freeglut is building its own menus from scratch.)
+ *
+ * FREEGLUT_MENUENTRY_HEIGHT gives the height of ONE menu box.  This should
+ * be the distances between two adjacent menu entries.  It should scale
+ * automatically with the font choice, so you needn't alter it---unless you
+ * use a stroked font.
+ *
+ * FREEGLUT_MENU_BORDER says how many pixels to allow around the edge of a
+ * menu.  (It also seems to be the same as the number of pixels used as
+ * a border around *items* to separate them from neighbors.  John says
+ * that that wasn't the original intent...if not, perhaps we need another
+ * symbolic constant, FREEGLUT_MENU_ITEM_BORDER, or such.)
+ */
+/* See platform-specific header files for menu font and color definitions */
+
+#define  FREEGLUT_MENUENTRY_HEIGHT(font)    (glutBitmapHeight(font) + \
+                                            FREEGLUT_MENU_BORDER)
+#define  FREEGLUT_MENU_BORDER   2
+
+
+/*
+ * These variables are for rendering the freeglut menu items.
+ *
+ * The choices are fore- and background, with and without h for Highlighting.
+ * Old GLUT appeared to be system-dependent for its colors (sigh) so we are
+ * too.  These variables should be stuffed into global state and initialized
+ * via the glutInit*() system.
+ */
+static float menu_pen_fore  [4] = FREEGLUT_MENU_PEN_FORE_COLORS ;
+static float menu_pen_back  [4] = FREEGLUT_MENU_PEN_BACK_COLORS ;
+static float menu_pen_hfore [4] = FREEGLUT_MENU_PEN_HFORE_COLORS;
+static float menu_pen_hback [4] = FREEGLUT_MENU_PEN_HBACK_COLORS;
+
+
+extern GLvoid fgPlatformGetGameModeVMaxExtent( SFG_Window* window, int* x, int* y );
+extern void fghPlatformGetCursorPos(const SFG_Window *window, GLboolean client, SFG_XYUse *mouse_pos);
+extern SFG_Font* fghFontByID( void* font );
+extern void fgPlatformHideWindow( SFG_Window* window );
+
+/* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
+
+/*
+ * Private function to find a menu entry by index
+ */
+static SFG_MenuEntry *fghFindMenuEntry( SFG_Menu* menu, int index )
+{
+    SFG_MenuEntry *entry;
+    int i = 1;
+
+    for( entry = (SFG_MenuEntry *)menu->Entries.First;
+         entry;
+         entry = (SFG_MenuEntry *)entry->Node.Next )
+    {
+        if( i == index )
+            break;
+        ++i;
+    }
+
+    return entry;
+}
+
+/*
+ * Deactivates a menu pointed by the function argument.
+ */
+static void fghDeactivateSubMenu( SFG_MenuEntry *menuEntry )
+{
+    SFG_MenuEntry *subMenuIter;
+    /* Hide the present menu's window */
+    fgPlatformHideWindow( menuEntry->SubMenu->Window );
+
+    /* Forget about having that menu active anymore, now: */
+    menuEntry->SubMenu->Window->ActiveMenu = NULL;
+    menuEntry->SubMenu->IsActive = GL_FALSE;
+    menuEntry->SubMenu->ActiveEntry = NULL;
+
+    /* Hide all submenu windows, and the root menu's window. */
+    for ( subMenuIter = (SFG_MenuEntry *)menuEntry->SubMenu->Entries.First;
+          subMenuIter;
+          subMenuIter = (SFG_MenuEntry *)subMenuIter->Node.Next )
+    {
+        subMenuIter->IsActive = GL_FALSE;
+
+        /* Is that an active submenu by any case? */
+        if( subMenuIter->SubMenu )
+            fghDeactivateSubMenu( subMenuIter );
+    }
+}
+
+/*
+ * Private function to get the virtual maximum screen extent
+ */
+static GLvoid fghGetVMaxExtent( SFG_Window* window, int* x, int* y )
+{
+    if( fgStructure.GameModeWindow )
+		fgPlatformGetGameModeVMaxExtent ( window, x, y );
+    else
+    {
+        *x = fgDisplay.ScreenWidth;
+        *y = fgDisplay.ScreenHeight;
+    }
+}
+
+/*
+ * Private function to check for the current menu/sub menu activity state
+ */
+static GLboolean fghCheckMenuStatus( SFG_Menu* menu )
+{
+    SFG_MenuEntry* menuEntry;
+    int x, y;
+
+    /* First of all check any of the active sub menus... */
+    for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
+         menuEntry;
+         menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
+    {
+        if( menuEntry->SubMenu && menuEntry->IsActive )
+        {
+            /*
+             * OK, have the sub-menu checked, too. If it returns GL_TRUE, it
+             * will mean that it caught the mouse cursor and we do not need
+             * to regenerate the activity list, and so our parents do...
+             */
+            GLboolean return_status;
+
+            menuEntry->SubMenu->Window->State.MouseX =
+                menu->Window->State.MouseX + menu->X - menuEntry->SubMenu->X;
+            menuEntry->SubMenu->Window->State.MouseY =
+                menu->Window->State.MouseY + menu->Y - menuEntry->SubMenu->Y;
+            return_status = fghCheckMenuStatus( menuEntry->SubMenu );
+
+            if ( return_status )
+                return GL_TRUE;
+        }
+    }
+
+    /* That much about our sub menus, let's get to checking the current menu: */
+    x = menu->Window->State.MouseX;
+    y = menu->Window->State.MouseY;
+
+    /* Check if the mouse cursor is contained within the current menu box */
+    if( ( x >= FREEGLUT_MENU_BORDER ) &&
+        ( x < menu->Width  - FREEGLUT_MENU_BORDER ) &&
+        ( y >= FREEGLUT_MENU_BORDER ) &&
+        ( y < menu->Height - FREEGLUT_MENU_BORDER )  )
+    {
+        int menuID = ( y - FREEGLUT_MENU_BORDER ) / FREEGLUT_MENUENTRY_HEIGHT(menu->Font);
+
+        /* The mouse cursor is somewhere over our box, check it out. */
+        menuEntry = fghFindMenuEntry( menu, menuID + 1 );
+        FREEGLUT_INTERNAL_ERROR_EXIT( menuEntry, "Cannot find menu entry",
+                                      "fghCheckMenuStatus" );
+
+        menuEntry->IsActive = GL_TRUE;
+        menuEntry->Ordinal = menuID;
+
+        /*
+         * If this is not the same as the last active menu entry, deactivate
+         * the previous entry.  Specifically, if the previous active entry
+         * was a submenu then deactivate it.
+         */
+        if( menu->ActiveEntry && ( menuEntry != menu->ActiveEntry ) )
+            if( menu->ActiveEntry->SubMenu )
+                fghDeactivateSubMenu( menu->ActiveEntry );
+
+        if( menuEntry != menu->ActiveEntry )
+        {
+            menu->Window->State.WorkMask |= GLUT_DISPLAY_WORK;
+            if( menu->ActiveEntry )
+                menu->ActiveEntry->IsActive = GL_FALSE;
+        }
+
+        menu->ActiveEntry = menuEntry;
+        menu->IsActive = GL_TRUE;
+
+        /*
+         * OK, we have marked that entry as active, but it would be also
+         * nice to have its contents updated, in case it's a sub menu.
+         * Also, ignore the return value of the check function:
+         */
+        if( menuEntry->SubMenu )
+        {
+            if ( ! menuEntry->SubMenu->IsActive )
+            {
+                int max_x, max_y;
+                SFG_Window *current_window = fgStructure.CurrentWindow;
+
+                /* Set up the initial menu position now... */
+                menuEntry->SubMenu->IsActive = GL_TRUE;
+
+                /* Set up the initial submenu position now: */
+                fghGetVMaxExtent(menu->ParentWindow, &max_x, &max_y);
+                menuEntry->SubMenu->X = menu->X + menu->Width;
+                menuEntry->SubMenu->Y = menu->Y +
+                    menuEntry->Ordinal * FREEGLUT_MENUENTRY_HEIGHT(menu->Font);
+
+                if( menuEntry->SubMenu->X + menuEntry->SubMenu->Width > max_x )
+                    menuEntry->SubMenu->X = menu->X - menuEntry->SubMenu->Width;
+
+                if( menuEntry->SubMenu->Y + menuEntry->SubMenu->Height > max_y )
+                {
+                    menuEntry->SubMenu->Y -= ( menuEntry->SubMenu->Height -
+                                               FREEGLUT_MENUENTRY_HEIGHT(menu->Font) -
+                                               2 * FREEGLUT_MENU_BORDER );
+                    if( menuEntry->SubMenu->Y < 0 )
+                        menuEntry->SubMenu->Y = 0;
+                }
+
+                fgSetWindow( menuEntry->SubMenu->Window );
+                glutPositionWindow( menuEntry->SubMenu->X,
+                                    menuEntry->SubMenu->Y );
+                glutReshapeWindow( menuEntry->SubMenu->Width,
+                                   menuEntry->SubMenu->Height );
+                glutPopWindow( );
+                glutShowWindow( );
+                menuEntry->SubMenu->Window->ActiveMenu = menuEntry->SubMenu;
+                fgSetWindow( current_window );
+                menuEntry->SubMenu->Window->State.MouseX =
+                    x + menu->X - menuEntry->SubMenu->X;
+                menuEntry->SubMenu->Window->State.MouseY =
+                    y + menu->Y - menuEntry->SubMenu->Y;
+                fghCheckMenuStatus( menuEntry->SubMenu );
+            }
+
+            /* Activate it because its parent entry is active */
+            menuEntry->SubMenu->IsActive = GL_TRUE;
+        }
+
+        /* Report back that we have caught the menu cursor */
+        return GL_TRUE;
+    }
+
+    /* Looks like the menu cursor is somewhere else... */
+    if( menu->ActiveEntry && menu->ActiveEntry->IsActive &&
+        ( !menu->ActiveEntry->SubMenu ||
+          !menu->ActiveEntry->SubMenu->IsActive ) )
+    {
+        menu->Window->State.WorkMask |= GLUT_DISPLAY_WORK;
+        menu->ActiveEntry->IsActive = GL_FALSE;
+        menu->ActiveEntry = NULL;
+    }
+
+    return GL_FALSE;
+}
+
+/*
+ * Displays a menu box and all of its submenus (if they are active)
+ */
+static void fghDisplayMenuBox( SFG_Menu* menu )
+{
+    SFG_MenuEntry *menuEntry;
+    int i;
+    int border = FREEGLUT_MENU_BORDER;
+
+    /*
+     * Have the menu box drawn first. The +- values are
+     * here just to make it more nice-looking...
+     */
+    /* a non-black dark version of the below. */
+    glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
+    glBegin( GL_QUAD_STRIP );
+        glVertex2i( menu->Width         , 0                    );
+        glVertex2i( menu->Width - border,                border);
+        glVertex2i( 0                   , 0                    );
+        glVertex2i(               border,                border);
+        glVertex2i( 0                   , menu->Height         );
+        glVertex2i(               border, menu->Height - border);
+    glEnd( );
+
+    /* a non-black dark version of the below. */
+    glColor4f( 0.5f, 0.5f, 0.5f, 1.0f );
+    glBegin( GL_QUAD_STRIP );
+        glVertex2i( 0                   , menu->Height         );
+        glVertex2i(               border, menu->Height - border);
+        glVertex2i( menu->Width         , menu->Height         );
+        glVertex2i( menu->Width - border, menu->Height - border);
+        glVertex2i( menu->Width         , 0                    );
+        glVertex2i( menu->Width - border,                border);
+    glEnd( );
+
+    glColor4fv( menu_pen_back );
+    glBegin( GL_QUADS );
+        glVertex2i(               border,                border);
+        glVertex2i( menu->Width - border,                border);
+        glVertex2i( menu->Width - border, menu->Height - border);
+        glVertex2i(               border, menu->Height - border);
+    glEnd( );
+
+    /* Check if any of the submenus is currently active... */
+    for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
+         menuEntry;
+         menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
+    {
+        /* Has the menu been marked as active, maybe? */
+        if( menuEntry->IsActive )
+        {
+            /*
+             * That's truly right, and we need to have it highlighted.
+             * There is an assumption that mouse cursor didn't move
+             * since the last check of menu activity state:
+             */
+            int menuID = menuEntry->Ordinal;
+
+            /* So have the highlight drawn... */
+            glColor4fv( menu_pen_hback );
+            glBegin( GL_QUADS );
+                glVertex2i( border,
+                            (menuID + 0)*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border );
+                glVertex2i( menu->Width - border,
+                            (menuID + 0)*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border );
+                glVertex2i( menu->Width - border,
+                            (menuID + 1)*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border );
+                glVertex2i( border,
+                            (menuID + 1)*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border );
+            glEnd( );
+        }
+    }
+
+    /* Print the menu entries now... */
+
+    glColor4fv( menu_pen_fore );
+
+    for( menuEntry = (SFG_MenuEntry *)menu->Entries.First, i = 0;
+         menuEntry;
+         menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next, ++i )
+    {
+        /* If the menu entry is active, set the color to white */
+        if( menuEntry->IsActive )
+            glColor4fv( menu_pen_hfore );
+
+        /* Move the raster into position... */
+        /* Try to center the text - JCJ 31 July 2003*/
+        glRasterPos2i(
+            2 * border,
+            ( i + 1 )*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) -
+            ( int )( FREEGLUT_MENUENTRY_HEIGHT(menu->Font)*0.3 - border )
+        );
+
+        /* Have the label drawn, character after character: */
+        glutBitmapString( menu->Font,
+                          (unsigned char *)menuEntry->Text);
+
+        /* If it's a submenu, draw a right arrow */
+        if( menuEntry->SubMenu )
+        {
+            int width = glutBitmapWidth( menu->Font, '_' );
+            int x_base = menu->Width - 2 - width;
+            int y_base = i*FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border;
+            glBegin( GL_TRIANGLES );
+                glVertex2i( x_base, y_base + 2*border);
+                glVertex2i( menu->Width - 2, y_base +
+                            ( FREEGLUT_MENUENTRY_HEIGHT(menu->Font) + border) / 2 );
+                glVertex2i( x_base, y_base + FREEGLUT_MENUENTRY_HEIGHT(menu->Font) - border );
+            glEnd( );
+        }
+
+        /* If the menu entry is active, reset the color */
+        if( menuEntry->IsActive )
+            glColor4fv( menu_pen_fore );
+    }
+}
+
+/*
+ * Private static function to set the parent window of a submenu and all
+ * of its submenus.
+ */
+static void fghSetMenuParentWindow( SFG_Window *window, SFG_Menu *menu )
+{
+    SFG_MenuEntry *menuEntry;
+
+    menu->ParentWindow = window;
+
+    for( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
+         menuEntry;
+         menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
+        if( menuEntry->SubMenu )
+            fghSetMenuParentWindow( window, menuEntry->SubMenu );
+}
+
+
+/*
+ * Displays the currently active menu for the current window
+ */
+void fgDisplayMenu( void )
+{
+    SFG_Window* window = fgStructure.CurrentWindow;
+    SFG_Menu* menu = NULL;
+
+    FREEGLUT_INTERNAL_ERROR_EXIT ( fgStructure.CurrentWindow, "Displaying menu in nonexistent window",
+                                   "fgDisplayMenu" );
+
+    /* Check if there is an active menu attached to this window... */
+    menu = window->ActiveMenu;
+    freeglut_return_if_fail( menu );
+
+    fgSetWindow( menu->Window );
+
+    glPushAttrib( GL_DEPTH_BUFFER_BIT | GL_TEXTURE_BIT | GL_LIGHTING_BIT |
+                  GL_POLYGON_BIT );
+
+    glDisable( GL_DEPTH_TEST );
+    glDisable( GL_TEXTURE_2D );
+    glDisable( GL_LIGHTING   );
+    glDisable( GL_CULL_FACE  );
+
+    glMatrixMode( GL_PROJECTION );
+    glPushMatrix( );
+    glLoadIdentity( );
+    glOrtho(
+         0, glutGet( GLUT_WINDOW_WIDTH  ),
+         glutGet( GLUT_WINDOW_HEIGHT ), 0,
+        -1, 1
+    );
+
+    glMatrixMode( GL_MODELVIEW );
+    glPushMatrix( );
+    glLoadIdentity( );
+
+    fghDisplayMenuBox( menu );
+
+    glPopAttrib( );
+
+    glMatrixMode( GL_PROJECTION );
+    glPopMatrix( );
+    glMatrixMode( GL_MODELVIEW );
+    glPopMatrix( );
+
+    glutSwapBuffers( );
+
+    fgSetWindow ( window );
+}
+
+/*
+ * Activates a menu pointed by the function argument
+ */
+static void fghActivateMenu( SFG_Window* window, int button )
+{
+    int max_x, max_y;
+    SFG_XYUse mouse_pos;
+
+    /* We'll be referencing this menu a lot, so remember its address: */
+    SFG_Menu* menu = window->Menu[ button ];
+    SFG_Window* current_window = fgStructure.CurrentWindow;
+
+    /* If the menu is already active in another window, deactivate it (and any submenus) there */
+    if ( menu->ParentWindow )
+      fgDeactivateMenu(menu->ParentWindow);
+
+    /* Mark the menu as active, so that it gets displayed: */
+    window->ActiveMenu = menu;
+    menu->IsActive = GL_TRUE;
+    fghSetMenuParentWindow ( window, menu );
+    fgState.ActiveMenus++;
+
+    /* Set up the initial menu position now: */
+    fghGetVMaxExtent(menu->ParentWindow, &max_x, &max_y);
+    fgSetWindow( window );
+    /* get mouse position on screen (window->State.MouseX and window->State.MouseY
+     * are relative to client area origin), and not easy to correct given that
+     * glutGet( GLUT_WINDOW_X ) and glutGet( GLUT_WINDOW_Y ) return relative to parent
+     * origin when looking at a child window
+     * for parent windows: window->State.MouseX + glutGet( GLUT_WINDOW_X ) == mouse_pos.X
+     */
+    fghPlatformGetCursorPos(NULL, GL_FALSE, &mouse_pos);
+    menu->X = mouse_pos.X;
+    menu->Y = mouse_pos.Y;
+
+    /* Make sure the whole menu is on the screen */
+    if( menu->X + menu->Width > max_x )
+        menu->X -=menu->Width;
+
+    if( menu->Y + menu->Height > max_y )
+    {
+        menu->Y -=menu->Height;
+        if( menu->Y < 0 )
+            menu->Y = 0;
+    }
+
+    /* Set position of mouse relative to top-left menu in menu's window state (could as well set 0 at creation time...) */
+    menu->Window->State.MouseX = mouse_pos.X - menu->X;
+    menu->Window->State.MouseY = mouse_pos.Y - menu->Y;
+
+    /* Menu status callback */
+    if (fgState.MenuStateCallback || fgState.MenuStatusCallback)
+    {
+        fgStructure.CurrentMenu = menu;
+        fgStructure.CurrentWindow = window;
+        if (fgState.MenuStateCallback)
+            fgState.MenuStateCallback(GLUT_MENU_IN_USE);
+        if (fgState.MenuStatusCallback)
+            /* window->State.MouseX and window->State.MouseY are relative to client area origin, as needed */
+            fgState.MenuStatusCallback(GLUT_MENU_IN_USE, window->State.MouseX, window->State.MouseY);
+    }
+
+    fgSetWindow( menu->Window );
+    glutPositionWindow( menu->X, menu->Y );
+    glutReshapeWindow( menu->Width, menu->Height );
+    glutPopWindow( );
+    glutShowWindow( );
+    menu->Window->ActiveMenu = menu;
+    fghCheckMenuStatus( menu );
+    fgSetWindow( current_window );
+}
+
+/*
+ * Update Highlight states of the menu
+ * NB: Current mouse position is in menu->Window->State.MouseX/Y
+ */
+void fgUpdateMenuHighlight ( SFG_Menu *menu )
+{
+    fghCheckMenuStatus( menu );
+}
+
+/*
+ * Check whether an active menu absorbs a mouse click
+ */
+GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
+                              int mouse_x, int mouse_y )
+{
+    GLboolean is_handled = GL_FALSE;
+    GLboolean is_clicked = GL_FALSE;
+    /*
+     * Near as I can tell, this is the menu behaviour:
+     *  - Down-click the menu button, menu not active:  activate
+     *    the menu with its upper left-hand corner at the mouse
+     *    location.
+     *  - Down-click any button outside the menu, menu active:
+     *    deactivate the menu, and potentially activate a new menu
+     *    at the new mouse location. This includes clicks in
+     *    different windows of course
+     *  - Down-click any button inside the menu, menu active:
+     *    select the menu entry and deactivate the menu
+     *  - Up-click the menu button, menu not active:  nothing happens
+     *  - Up-click the menu button outside the menu, menu active:
+     *    nothing happens
+     *  - Up-click the menu button inside the menu, menu active:
+     *    select the menu entry and deactivate the menu
+     * Since menus can have submenus, we need to check this recursively.
+     */
+    if( window->ActiveMenu )
+    {
+        if( window == window->ActiveMenu->ParentWindow )
+        {
+            window->ActiveMenu->Window->State.MouseX =
+                                       mouse_x - window->ActiveMenu->X;
+            window->ActiveMenu->Window->State.MouseY =
+                                       mouse_y - window->ActiveMenu->Y;
+        }
+
+        /* In the menu, deactivate the menu and invoke the callback */
+        if( fghCheckMenuStatus( window->ActiveMenu ) )
+        {
+            /*
+             * Save the current window and menu and set the current
+             * window to the window whose menu this is
+             */
+            SFG_Window *save_window = fgStructure.CurrentWindow;
+            SFG_Menu *save_menu = fgStructure.CurrentMenu, *active_menu = window->ActiveMenu;   /* active menu is always the one with the mouse in it, due to fghCheckMenuStatus */
+            SFG_MenuEntry *active_entry = active_menu->ActiveEntry;                             /* currently highlighted item -> must be the one that was just clicked */
+            SFG_Window *parent_window = window->ActiveMenu->ParentWindow;
+
+            /* ignore clicks on the submenu entry */
+            if (!active_entry->SubMenu)
+            {
+                fgSetWindow( parent_window );
+                fgStructure.CurrentMenu = active_menu;
+
+                /* Deactivate menu and then call callback (we don't want menu to stay in view while callback is executing, and user should be able to change menus in callback) */
+                fgDeactivateMenu( parent_window );
+                active_menu->Callback( active_entry->ID );
+
+                /* Restore the current window and menu */
+                fgSetWindow( save_window );
+                fgStructure.CurrentMenu = save_menu;
+            }
+
+            is_clicked = GL_TRUE;   /* Don't reopen... */
+        }
+        else if( pressed )
+            /*
+             * Outside the menu, deactivate if it's a downclick
+             *
+             * A downclick outside of the interior of our freeglut windows
+             * is dealt with in the WM_KILLFOCUS handler of fgPlatformWindowProc
+             */
+        {
+            fgDeactivateMenu( window->ActiveMenu->ParentWindow );
+            /* Could reopen again in different location, as is_clicked remains false */
+        }
+
+        is_handled = GL_TRUE;
+    }
+    else if ( fgState.ActiveMenus ) /* Don't have to check whether this was a downpress or an uppress, there is no way to get an uppress in another window before a downpress... */
+    {
+        /* if another window than the one clicked in has an open menu, close it */
+        SFG_Menu *menu = fgGetActiveMenu();
+        if ( menu ) /* any open menu? */
+            fgDeactivateMenu( menu->ParentWindow );
+
+        /* Leave is_handled to false, we didn't do anything relevant from the perspective of the window that was clicked */
+    }
+
+    /* No active menu, let's check whether we need to activate one. */
+    if( !is_clicked &&
+        ( 0 <= button ) &&
+        ( FREEGLUT_MAX_MENUS > button ) &&
+        ( window->Menu[ button ] ) &&
+        pressed )
+    {
+        /* If mouseclick was outside the parent window, ignore. This can
+         * happen when another mouse button is already depressed and the
+         * window thus has mouse capture
+         */
+        if (window->State.MouseX>0 && window->State.MouseY>0 &&
+            window->State.MouseX<window->State.Width && window->State.MouseY<window->State.Height)
+        {
+            fghActivateMenu( window, button );
+            is_handled = GL_TRUE;
+        }
+    }
+
+    return is_handled;
+}
+
+/*
+ * Deactivates a menu pointed by the function argument.
+ */
+static SFG_Menu* menuDeactivating = NULL;
+void fgDeactivateMenu( SFG_Window *window )
+{
+    SFG_Window *parent_window = NULL;
+    SFG_Menu* menu;
+    SFG_MenuEntry *menuEntry;
+
+    /* Did we find an active window? */
+    freeglut_return_if_fail( window );
+    /* Check if there is an active menu attached to this window... */
+    menu = window->ActiveMenu;
+    freeglut_return_if_fail( menu );
+    /* Check if we are already deactivating this menu, abort in that case (glutHideWindow below can cause this function to be called again on the same menu..) */
+    if (menu==menuDeactivating)
+        return;
+    menuDeactivating = menu;
+
+    parent_window = menu->ParentWindow;
+
+    /* Hide the present menu's window */
+    fgPlatformHideWindow( menu->Window );
+
+    /* Forget about having that menu active anymore, now: */
+    menu->Window->ActiveMenu = NULL;
+    menu->ParentWindow->ActiveMenu = NULL;
+    fghSetMenuParentWindow ( NULL, menu );
+    menu->IsActive = GL_FALSE;
+    menu->ActiveEntry = NULL;
+
+    fgState.ActiveMenus--;
+
+    /* Hide all submenu windows, and the root menu's window. */
+    for ( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
+          menuEntry;
+          menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
+    {
+        menuEntry->IsActive = GL_FALSE;
+
+        /* Is that an active submenu by any chance? */
+        if( menuEntry->SubMenu )
+            fghDeactivateSubMenu( menuEntry );
+    }
+    /* Done deactivating menu */
+    menuDeactivating = NULL;
+
+    /* Menu status callback */
+    if (fgState.MenuStateCallback || fgState.MenuStatusCallback)
+    {
+        fgStructure.CurrentMenu = menu;
+        fgStructure.CurrentWindow = parent_window;
+        if (fgState.MenuStateCallback)
+            fgState.MenuStateCallback(GLUT_MENU_NOT_IN_USE);
+        if (fgState.MenuStatusCallback)
+        {
+            /* Get cursor position relative to parent_window's client area */
+            SFG_XYUse mouse_pos;
+            fghPlatformGetCursorPos(parent_window, GL_TRUE, &mouse_pos);
+
+            fgState.MenuStatusCallback(GLUT_MENU_NOT_IN_USE, mouse_pos.X, mouse_pos.Y);
+        }
+    }
+}
+
+/*
+ * Recalculates current menu's box size
+ */
+void fghCalculateMenuBoxSize( void )
+{
+    SFG_MenuEntry* menuEntry;
+    int width = 0, height = 0;
+
+    /* Make sure there is a current menu set */
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+
+    /* The menu's box size depends on the menu entries: */
+    for( menuEntry = ( SFG_MenuEntry * )fgStructure.CurrentMenu->Entries.First;
+         menuEntry;
+         menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
+    {
+        /* Update the menu entry's width value */
+        menuEntry->Width = glutBitmapLength(
+            fgStructure.CurrentMenu->Font,
+            (unsigned char *)menuEntry->Text
+        );
+
+        /*
+         * If the entry is a submenu, then it needs to be wider to
+         * accommodate the arrow.
+         */
+        if (menuEntry->SubMenu)
+            menuEntry->Width += glutBitmapLength(
+                fgStructure.CurrentMenu->Font,
+                (unsigned char *)"_"
+            );
+
+        /* Check if it's the biggest we've found */
+        if( menuEntry->Width > width )
+            width = menuEntry->Width;
+
+        height += FREEGLUT_MENUENTRY_HEIGHT(fgStructure.CurrentMenu->Font);
+    }
+
+    /* Store the menu's box size now: */
+    fgStructure.CurrentMenu->Height = height + 2 * FREEGLUT_MENU_BORDER;
+    fgStructure.CurrentMenu->Width  = width  + 4 * FREEGLUT_MENU_BORDER;
+}
+
+
+/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
+
+/*
+ * Creates a new menu object, adding it to the freeglut structure
+ */
+int FGAPIENTRY glutCreateMenu( FGCBMenu callback )
+{
+    /* The menu object creation code resides in fg_structure.c */
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutCreateMenu" );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    return fgCreateMenu( callback )->ID;
+}
+
+/*
+ * Destroys a menu object, removing all references to it
+ */
+void FGAPIENTRY glutDestroyMenu( int menuID )
+{
+    SFG_Menu* menu;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDestroyMenu" );
+    menu = fgMenuByID( menuID );
+
+    freeglut_return_if_fail( menu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    /* The menu object destruction code resides in fg_structure.c */
+    fgDestroyMenu( menu );
+}
+
+/*
+ * Returns the ID number of the currently active menu
+ */
+int FGAPIENTRY glutGetMenu( void )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGetMenu" );
+
+    if( fgStructure.CurrentMenu )
+        return fgStructure.CurrentMenu->ID;
+
+    return 0;
+}
+
+/*
+ * Sets the current menu given its menu ID
+ */
+void FGAPIENTRY glutSetMenu( int menuID )
+{
+    SFG_Menu* menu;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetMenu" );
+    menu = fgMenuByID( menuID );
+
+    freeglut_return_if_fail( menu );
+
+    fgStructure.CurrentMenu = menu;
+}
+
+/*
+ * Adds a menu entry to the bottom of the current menu
+ */
+void FGAPIENTRY glutAddMenuEntry( const char* label, int value )
+{
+    SFG_MenuEntry* menuEntry;
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAddMenuEntry" );
+    menuEntry = (SFG_MenuEntry *)calloc( sizeof(SFG_MenuEntry), 1 );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    menuEntry->Text = strdup( label );
+    menuEntry->ID   = value;
+
+    /* Have the new menu entry attached to the current menu */
+    fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
+
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Add a sub menu to the bottom of the current menu
+ */
+void FGAPIENTRY glutAddSubMenu( const char *label, int subMenuID )
+{
+    SFG_MenuEntry *menuEntry;
+    SFG_Menu *subMenu;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAddSubMenu" );
+    menuEntry = ( SFG_MenuEntry * )calloc( sizeof( SFG_MenuEntry ), 1 );
+    subMenu = fgMenuByID( subMenuID );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    freeglut_return_if_fail( subMenu );
+
+    menuEntry->Text    = strdup( label );
+    menuEntry->SubMenu = subMenu;
+    menuEntry->ID      = -1;
+
+    fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Changes the current menu's font
+ */
+void FGAPIENTRY glutSetMenuFont( int menuID, void* fontID )
+{
+    SFG_Font* font;
+    SFG_Menu* menu;
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetMenuFont" );
+    menu = fgMenuByID( menuID );
+    freeglut_return_if_fail( menu );
+
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    font = fghFontByID( fontID );
+    if (!font)
+    {
+        fgWarning("glutChangeMenuFont: bitmap font 0x%08x not found. Make sure you're not passing a stroke font. Ignoring...\n",fontID);
+        return;
+    }
+
+    fgStructure.CurrentMenu->Font = fontID;
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Changes the specified menu item in the current menu into a menu entry
+ */
+void FGAPIENTRY glutChangeToMenuEntry( int item, const char* label, int value )
+{
+    SFG_MenuEntry* menuEntry = NULL;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutChangeToMenuEntry" );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    /* Get n-th menu entry in the current menu, starting from one: */
+    menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
+
+    freeglut_return_if_fail( menuEntry );
+
+    /* We want it to become a normal menu entry, so: */
+    if( menuEntry->Text )
+        free( menuEntry->Text );
+
+    menuEntry->Text    = strdup( label );
+    menuEntry->ID      = value;
+    menuEntry->SubMenu = NULL;
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Changes the specified menu item in the current menu into a sub-menu trigger.
+ */
+void FGAPIENTRY glutChangeToSubMenu( int item, const char* label,
+                                     int subMenuID )
+{
+    SFG_Menu*      subMenu;
+    SFG_MenuEntry* menuEntry;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutChangeToSubMenu" );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    /* Get handle to sub menu */
+    subMenu = fgMenuByID( subMenuID );
+    menuEntry = NULL;
+    freeglut_return_if_fail( subMenu );
+
+    /* Get n-th menu entry in the current menu, starting from one: */
+    menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
+
+    freeglut_return_if_fail( menuEntry );
+
+    /* We want it to become a sub menu entry, so: */
+    if( menuEntry->Text )
+        free( menuEntry->Text );
+
+    menuEntry->Text    = strdup( label );
+    menuEntry->SubMenu = subMenu;
+    menuEntry->ID      = -1;
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Removes the specified menu item from the current menu
+ */
+void FGAPIENTRY glutRemoveMenuItem( int item )
+{
+    SFG_MenuEntry* menuEntry;
+
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutRemoveMenuItem" );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    /* Get n-th menu entry in the current menu, starting from one: */
+    menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
+
+    freeglut_return_if_fail( menuEntry );
+
+    fgListRemove( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
+    if ( menuEntry->Text )
+      free( menuEntry->Text );
+
+    free( menuEntry );
+    fghCalculateMenuBoxSize( );
+}
+
+/*
+ * Attaches a menu to the current window
+ */
+void FGAPIENTRY glutAttachMenu( int button )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAttachMenu" );
+
+    freeglut_return_if_fail( fgStructure.CurrentWindow );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    freeglut_return_if_fail( button >= 0 );
+    freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
+
+    fgStructure.CurrentWindow->Menu[ button ] = fgStructure.CurrentMenu;
+}
+
+/*
+ * Detaches a menu from the current window
+ */
+void FGAPIENTRY glutDetachMenu( int button )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDetachMenu" );
+
+    freeglut_return_if_fail( fgStructure.CurrentWindow );
+
+    freeglut_return_if_fail( fgStructure.CurrentMenu );
+    if (fgState.ActiveMenus)
+        fgError("Menu manipulation not allowed while menus in use.");
+
+    freeglut_return_if_fail( button >= 0 );
+    freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
+
+    fgStructure.CurrentWindow->Menu[ button ] = NULL;
+}
+
+/*
+ * A.Donev: Set and retrieve the menu's user data
+ */
+void* FGAPIENTRY glutGetMenuData( void )
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGetMenuData" );
+    return fgStructure.CurrentMenu->UserData;
+}
+
+void FGAPIENTRY glutSetMenuData(void* data)
+{
+    FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetMenuData" );
+    fgStructure.CurrentMenu->UserData=data;
+}
+
+/*** END OF FILE ***/