X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ffreeglut_gamemode.c;h=6934534ade59622eb96f508b1a167e51245a26f9;hb=1fd9514b5c5df8a4bf974787f26f6cc3dd84c1cc;hp=404b6c12c9758b7f9f7d9cffaa26ccf2492a6c36;hpb=f3841b1993425e78f3251567c83ccff338007d7b;p=freeglut

diff --git a/src/freeglut_gamemode.c b/src/freeglut_gamemode.c
index 404b6c1..6934534 100644
--- a/src/freeglut_gamemode.c
+++ b/src/freeglut_gamemode.c
@@ -40,31 +40,113 @@
 
 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
 
+static int xrandr_resize(int xsz, int ysz, int just_checking)
+{
+    int res = -1;
+
+#ifdef HAVE_X11_EXTENSIONS_XRANDR_H
+    int event_base, error_base;
+    Status st;
+    XRRScreenConfiguration *xrr_config;
+    XRRScreenSize *ssizes;
+    Rotation rot;
+    int i, ssizes_count, curr;
+    Time timestamp, cfg_timestamp;
+
+    /* must check at runtime for the availability of the extension */
+    if(!XRRQueryExtension(fgDisplay.Display, &event_base, &error_base)) {
+        return -1;
+    }
+
+    if(!(xrr_config = XRRGetScreenInfo(fgDisplay.Display, fgDisplay.RootWindow))) {
+        fgWarning("XRRGetScreenInfo failed");
+        return -1;
+    }
+    ssizes = XRRConfigSizes(xrr_config, &ssizes_count);
+    curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
+    timestamp = XRRConfigTimes(xrr_config, &cfg_timestamp);
+
+    if(xsz == ssizes[curr].width && ysz == ssizes[curr].height) {
+        /* no need to switch, we're already in the requested mode */
+        res = 0;
+        goto done;
+    }
+
+    for(i=0; i<ssizes_count; i++) {
+        if(ssizes[i].width == xsz && ssizes[i].height == ysz) {
+            break;  /* found it */
+        }
+    }
+    if(i == ssizes_count)
+        goto done;
+
+    if(just_checking) {
+        res = 0;
+        goto done;
+    }
+
+    if((st = XRRSetScreenConfig(fgDisplay.Display, xrr_config, fgDisplay.RootWindow,
+                    i, rot, timestamp)) != 0) {
+        fgWarning("XRRSetScreenConfig failed");
+        goto done;
+    }
+    res = 0;
+
+done:
+    XRRFreeScreenConfigInfo(xrr_config);
+#endif
+    return res;
+}
+
+
 /*
  * Remembers the current visual settings, so that
  * we can change them and restore later...
  */
 static void fghRememberState( void )
 {
-#if TARGET_HOST_UNIX_X11
+#if TARGET_HOST_POSIX_X11
+    int event_base, error_base;
+
+#   ifdef HAVE_X11_EXTENSIONS_XRANDR_H
+    if(XRRQueryExtension(fgDisplay.Display, &event_base, &error_base)) {
+        XRRScreenConfiguration *xrr_config;
+        XRRScreenSize *ssizes;
+        Rotation rot;
+        int ssize_count, curr;
+
+        if((xrr_config = XRRGetScreenInfo(fgDisplay.Display, fgDisplay.RootWindow))) {
+            ssizes = XRRConfigSizes(xrr_config, &ssize_count);
+            curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
+
+            fgDisplay.prev_xsz = ssizes[curr].width;
+            fgDisplay.prev_ysz = ssizes[curr].height;
+            fgDisplay.prev_size_valid = 1;
+            XRRFreeScreenConfigInfo(xrr_config);
+            return;
+        }
+    }
+#   endif
 
     /*
      * This highly depends on the XFree86 extensions,
      * not approved as X Consortium standards
      */
-#   ifdef X_XF86VidModeGetModeLine
-
+#   ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
+    if(!XF86VidModeQueryExtension(fgDisplay.Display, &event_base, &error_base)) {
+        return;
+    }
 
     /*
      * Remember the current ViewPort location of the screen to be able to
      * restore the ViewPort on LeaveGameMode():
      */
-    XF86VidModeGetViewPort(
-        fgDisplay.Display,
-        fgDisplay.Screen,
-        &fgDisplay.DisplayViewPortX,
-        &fgDisplay.DisplayViewPortY
-    );
+    if( !XF86VidModeGetViewPort(
+             fgDisplay.Display,
+             fgDisplay.Screen,
+             &fgDisplay.DisplayViewPortX,
+             &fgDisplay.DisplayViewPortY ) )
+        fgWarning( "XF86VidModeGetViewPort failed" );
 
     /*
      * Remember the current pointer location before going fullscreen
@@ -92,16 +174,10 @@ static void fghRememberState( void )
     );
 
     if( !fgDisplay.DisplayModeValid )
-            fgWarning( "Runtime use of XF86VidModeGetModeLine failed." );
-
-#   else
-    /*
-     * XXX warning fghRememberState: missing XFree86 video mode extensions,
-     * XXX game mode will not change screen resolution when activated
-     */
+            fgWarning( "XF86VidModeGetModeLine failed" );
 #   endif
 
-#elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
+#elif TARGET_HOST_MS_WINDOWS
 
 /*    DEVMODE devMode; */
 
@@ -110,7 +186,7 @@ static void fghRememberState( void )
 /* hack to get around my stupid cross-gcc headers */
 #define FREEGLUT_ENUM_CURRENT_SETTINGS -1
 
-    EnumDisplaySettings( NULL, FREEGLUT_ENUM_CURRENT_SETTINGS,
+    EnumDisplaySettings( fgDisplay.DisplayName, FREEGLUT_ENUM_CURRENT_SETTINGS,
                          &fgDisplay.DisplayMode );
 
     /* Make sure we will be restoring all settings needed */
@@ -125,9 +201,19 @@ static void fghRememberState( void )
  */
 static void fghRestoreState( void )
 {
-#if TARGET_HOST_UNIX_X11
+#if TARGET_HOST_POSIX_X11
 
-#   ifdef X_XF86VidModeGetAllModeLines
+#   ifdef HAVE_X11_EXTENSIONS_XRANDR_H
+    if(fgDisplay.prev_size_valid) {
+        if(xrandr_resize(fgDisplay.prev_xsz, fgDisplay.prev_ysz, 0) != -1) {
+            fgDisplay.prev_size_valid = 0;
+            return;
+        }
+    }
+#   endif
+
+
+#   ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
     /* Restore the remembered pointer position: */
     XWarpPointer(
         fgDisplay.Display, None, fgDisplay.RootWindow, 0, 0, 0, 0,
@@ -144,12 +230,16 @@ static void fghRestoreState( void )
         XF86VidModeModeInfo** displayModes;
         int i, displayModesCount;
 
-        XF86VidModeGetAllModeLines(
-            fgDisplay.Display,
-            fgDisplay.Screen,
-            &displayModesCount,
-            &displayModes
-        );
+        if( !XF86VidModeGetAllModeLines(
+                 fgDisplay.Display,
+                 fgDisplay.Screen,
+                 &displayModesCount,
+                 &displayModes ) )
+        {
+            fgWarning( "XF86VidModeGetAllModeLines failed" );
+            return;
+        }
+
 
         /*
          * Check every of the modes looking for one that matches our demands.
@@ -161,17 +251,22 @@ static void fghRestoreState( void )
                displayModes[ i ]->vdisplay == fgDisplay.DisplayMode.vdisplay &&
                displayModes[ i ]->dotclock == fgDisplay.DisplayModeClock )
             {
-                XF86VidModeSwitchToMode(
-                    fgDisplay.Display,
-                    fgDisplay.Screen,
-                    displayModes[ i ]
-                );
-                XF86VidModeSetViewPort(
-                     fgDisplay.Display,
-                     fgDisplay.Screen,
-                     fgDisplay.DisplayViewPortX,
-                     fgDisplay.DisplayViewPortY
-                );
+                if( !XF86VidModeSwitchToMode(
+                         fgDisplay.Display,
+                         fgDisplay.Screen,
+                         displayModes[ i ] ) )
+                {
+                    fgWarning( "XF86VidModeSwitchToMode failed" );
+                    break;
+                }
+
+                if( !XF86VidModeSetViewPort(
+                         fgDisplay.Display,
+                         fgDisplay.Screen,
+                         fgDisplay.DisplayViewPortX,
+                         fgDisplay.DisplayViewPortY ) )
+                    fgWarning( "HAVE_X11_EXTENSIONS_XF86VMODE_H failed" );
+
 
                 /*
                  * For the case this would be the last X11 call the application
@@ -186,23 +281,21 @@ static void fghRestoreState( void )
         XFree( displayModes );
     }
 
-#   else
-    /*
-     * XXX warning fghRestoreState: missing XFree86 video mode extensions,
-     * XXX game mode will not change screen resolution when activated
-     */
 #   endif
 
-#elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
+#elif TARGET_HOST_MS_WINDOWS
 
-    /* Restore the previously rememebered desktop display settings */
-    ChangeDisplaySettings( &fgDisplay.DisplayMode, 0 );
+    /* Restore the previously remembered desktop display settings */
+    ChangeDisplaySettingsEx( fgDisplay.DisplayName,&fgDisplay.DisplayMode, 0,0,0 );
 
 #endif
 }
 
+#if TARGET_HOST_POSIX_X11
+#ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
+
 /*
- * Checks the display mode settings against user's preferences
+ * Checks a single display mode settings against user's preferences.
  */
 static GLboolean fghCheckDisplayMode( int width, int height, int depth, int refresh )
 {
@@ -210,25 +303,68 @@ static GLboolean fghCheckDisplayMode( int width, int height, int depth, int refr
     return ( width == fgState.GameModeSize.X ) &&
            ( height == fgState.GameModeSize.Y ) &&
            ( depth == fgState.GameModeDepth ) &&
-           (refresh == fgState.GameModeRefresh );
+           ( refresh == fgState.GameModeRefresh );
+}
+
+/*
+ * Checks all display modes settings against user's preferences.
+ * Returns the mode number found or -1 if none could be found.
+ */
+static int fghCheckDisplayModes( GLboolean exactMatch, int displayModesCount, XF86VidModeModeInfo** displayModes )
+{
+    int i;
+    for( i = 0; i < displayModesCount; i++ )
+    {
+        /* Compute the displays refresh rate, dotclock comes in kHz. */
+        int refresh = ( displayModes[ i ]->dotclock * 1000 ) /
+                      ( displayModes[ i ]->htotal * displayModes[ i ]->vtotal );
+
+        if( fghCheckDisplayMode( displayModes[ i ]->hdisplay,
+                                 displayModes[ i ]->vdisplay,
+                                 fgState.GameModeDepth,
+                                 ( exactMatch ? refresh : fgState.GameModeRefresh ) ) ) {
+            if (!exactMatch)
+            {
+                /* Update the chosen refresh rate, otherwise a
+                 * glutGameModeGet(GLUT_GAME_MODE_REFRESH_RATE) would not
+                 * return the right values
+                 */
+                fgState.GameModeRefresh = refresh;
+            }
+
+            return i;
+        }
+    }
+    return -1;
 }
 
+#endif
+#endif
+
 /*
  * Changes the current display mode to match user's settings
  */
 static GLboolean fghChangeDisplayMode( GLboolean haveToTest )
 {
     GLboolean success = GL_FALSE;
-#if TARGET_HOST_UNIX_X11
+#if TARGET_HOST_POSIX_X11
+
+    /* first try to use XRandR, then fallback to XF86VidMode */
+#   ifdef HAVE_X11_EXTENSIONS_XRANDR_H
+    if(xrandr_resize(fgState.GameModeSize.X, fgState.GameModeSize.Y, haveToTest) != -1) {
+        return GL_TRUE;
+    }
+#   endif
+
 
     /*
      * This highly depends on the XFree86 extensions,
      * not approved as X Consortium standards
      */
-#   ifdef X_XF86VidModeGetAllModeLines
+#   ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
 
     /*
-     * This is also used by applcations which check modes by calling
+     * This is also used by applications which check modes by calling
      * glutGameModeGet(GLUT_GAME_MODE_POSSIBLE), so allow the check:
      */
     if( haveToTest || fgDisplay.DisplayModeValid )
@@ -236,111 +372,151 @@ static GLboolean fghChangeDisplayMode( GLboolean haveToTest )
         XF86VidModeModeInfo** displayModes;
         int i, displayModesCount;
 
-        XF86VidModeGetAllModeLines(
-            fgDisplay.Display,
-            fgDisplay.Screen,
-            &displayModesCount,
-            &displayModes
-        );
+        /* current display mode was queried in fghRememberState
+         * set defaulted values to the current display mode's
+         */
+        if (fgState.GameModeSize.X == -1)
+        {
+            fgState.GameModeSize.X = fgDisplay.DisplayMode.hdisplay;
+        }
+        if (fgState.GameModeSize.Y == -1)
+        {
+            fgState.GameModeSize.Y = fgDisplay.DisplayMode.vdisplay;
+        }
+        if (fgState.GameModeDepth == -1)
+        {
+            /* can't get color depth from this, nor can we change it, do nothing
+             * TODO: get with XGetVisualInfo()? but then how to set?
+             */
+        }
+        if (fgState.GameModeRefresh != -1)
+        {
+            /* Compute the displays refresh rate, dotclock comes in kHz. */
+            int refresh = ( fgDisplay.DisplayModeClock * 1000 ) /
+                ( fgDisplay.DisplayMode.htotal * fgDisplay.DisplayMode.vtotal );
 
-        /* Check every of the modes looking for one that matches our demands */
-        for( i = 0; i < displayModesCount; i++ )
+            fgState.GameModeRefresh = refresh;
+        }
+
+        /* query all possible display modes */
+        if( !XF86VidModeGetAllModeLines(
+                 fgDisplay.Display,
+                 fgDisplay.Screen,
+                 &displayModesCount,
+                 &displayModes ) )
         {
-            if( fghCheckDisplayMode( displayModes[ i ]->hdisplay,
-                                     displayModes[ i ]->vdisplay,
-                                     fgState.GameModeDepth,
-                                     fgState.GameModeRefresh ) )
-            {
-                /* OKi, this is the display mode we have been looking for... */
-                if( !haveToTest ) {
-                    XF86VidModeSwitchToMode(
-                        fgDisplay.Display,
-                        fgDisplay.Screen,
-                        displayModes[ i ]
-                    );
-                }
-                success = GL_TRUE;
-                break;
-            }
+            fgWarning( "XF86VidModeGetAllModeLines failed" );
+            return success;
+        }
+
+
+        /*
+         * Check every of the modes looking for one that matches our demands,
+         * ignoring the refresh rate if no exact match could be found.
+         */
+        i = fghCheckDisplayModes( GL_TRUE, displayModesCount, displayModes );
+        if( i < 0 ) {
+            i = fghCheckDisplayModes( GL_FALSE, displayModesCount, displayModes );
         }
+        success = ( i < 0 ) ? GL_FALSE : GL_TRUE;
+
+        if( !haveToTest && success ) {
+            if( !XF86VidModeSwitchToMode(
+                     fgDisplay.Display,
+                     fgDisplay.Screen,
+                     displayModes[ i ] ) )
+                fgWarning( "XF86VidModeSwitchToMode failed" );
+        }
+
         XFree( displayModes );
     }
 
 #   else
+
     /*
      * XXX warning fghChangeDisplayMode: missing XFree86 video mode extensions,
      * XXX game mode will not change screen resolution when activated
      */
+    success = GL_TRUE;
+
 #   endif
 
-#elif TARGET_HOST_WIN32 || TARGET_HOST_WINCE
+#elif TARGET_HOST_MS_WINDOWS
 
-    unsigned int    displayModes = 0, mode = 0xffffffff;
-    /* HDC      desktopDC; */
     DEVMODE  devMode;
+    char *fggmstr = NULL;
+    char displayMode[300];
 
-    /*
-     * Enumerate the available display modes
-     * Try to get a complete match
-     */
-    while( EnumDisplaySettings( NULL, displayModes, &devMode ) )
+    success = GL_FALSE;
+
+    EnumDisplaySettings( fgDisplay.DisplayName, -1, &devMode ); 
+    devMode.dmFields = 0;
+
+    if (fgState.GameModeSize.X!=-1)
     {
-        /* Does the enumerated display mode match the user's preferences? */
-        if( fghCheckDisplayMode( devMode.dmPelsWidth,  devMode.dmPelsHeight,
-                                 devMode.dmBitsPerPel,
-                                 devMode.dmDisplayFrequency ) )
-        {
-            mode = displayModes;
-            break;
-        }
-        displayModes++;
+        devMode.dmPelsWidth  = fgState.GameModeSize.X;
+        devMode.dmFields |= DM_PELSWIDTH;
     }
-
-    if( mode == 0xffffffff )
+    if (fgState.GameModeSize.Y!=-1)
     {
-        /* then try without Display Frequency */
-        displayModes = 0;
-
-        /* Enumerate the available display modes */
-        while( EnumDisplaySettings( NULL, displayModes, &devMode ) )
-        {
-            /* then try without Display Frequency */
-            if( fghCheckDisplayMode( devMode.dmPelsWidth,
-                                     devMode.dmPelsHeight,
-                                     devMode.dmBitsPerPel,
-                                     fgState.GameModeRefresh ) )
-            {
-                mode = displayModes;
-                break;
-            }
-            displayModes++;
-        }
+        devMode.dmPelsHeight  = fgState.GameModeSize.Y;
+        devMode.dmFields |= DM_PELSHEIGHT;
     }
-
-    /* Did we find a matching display mode? */
-    if( mode != 0xffffffff )
+    if (fgState.GameModeDepth!=-1)
     {
-        int retVal = DISP_CHANGE_SUCCESSFUL;
-
-        /* Mark the values we want to modify in the display change call */
-        devMode.dmFields |=
-            DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL | DM_DISPLAYFREQUENCY;
-
-        retVal = ChangeDisplaySettings( &devMode, haveToTest ? CDS_TEST : 0 );
+        devMode.dmBitsPerPel  = fgState.GameModeDepth;
+        devMode.dmFields |= DM_BITSPERPEL;
+    }
+    if (fgState.GameModeRefresh!=-1)
+    {
+        devMode.dmDisplayFrequency  = fgState.GameModeRefresh;
+        devMode.dmFields |= DM_DISPLAYFREQUENCY;
+    }
 
-        /* I don't know if it's really needed, but looks nice: */
-        success = (retVal == DISP_CHANGE_SUCCESSFUL) ||
-            (retVal == DISP_CHANGE_NOTUPDATED);
+    switch ( ChangeDisplaySettingsEx(fgDisplay.DisplayName, &devMode, NULL, haveToTest ? CDS_TEST : CDS_FULLSCREEN , NULL) )
+    {
+    case DISP_CHANGE_SUCCESSFUL:
+        success = GL_TRUE;
 
-        if( !haveToTest && success )
+        if (!haveToTest)
         {
-            fgState.GameModeSize.X  = devMode.dmPelsWidth;
+            /* update vars in case if windows switched to proper mode */
+            EnumDisplaySettings( fgDisplay.DisplayName, FREEGLUT_ENUM_CURRENT_SETTINGS, &devMode );
+            fgState.GameModeSize.X  = devMode.dmPelsWidth;        
             fgState.GameModeSize.Y  = devMode.dmPelsHeight;
             fgState.GameModeDepth   = devMode.dmBitsPerPel;
             fgState.GameModeRefresh = devMode.dmDisplayFrequency;
         }
+		break;
+    case DISP_CHANGE_RESTART:
+        fggmstr = "The computer must be restarted for the graphics mode to work.";
+        break;
+    case DISP_CHANGE_BADFLAGS:
+        fggmstr = "An invalid set of flags was passed in.";
+        break;
+    case DISP_CHANGE_BADPARAM:
+        fggmstr = "An invalid parameter was passed in. This can include an invalid flag or combination of flags.";
+        break;
+    case DISP_CHANGE_FAILED:
+        fggmstr = "The display driver failed the specified graphics mode.";
+        break;
+    case DISP_CHANGE_BADMODE:
+        fggmstr = "The graphics mode is not supported.";
+        break;
+    default:
+        fggmstr = "Unknown error in graphics mode???"; /* dunno if it is possible,MSDN does not mention any other error */
+        break;
     }
 
+    if ( !success )
+    {
+        /* I'd rather get info whats going on in my program than wonder about */
+        /* magic happenings behind my back, its lib for devels at last ;) */
+        
+        /* append display mode to error to make things more informative */
+        sprintf(displayMode,"%s Problem with requested mode: %ix%i:%i@%i", fggmstr, devMode.dmPelsWidth, devMode.dmPelsHeight, devMode.dmBitsPerPel, devMode.dmDisplayFrequency);
+        fgWarning(displayMode);
+    }
 #endif
 
     return success;
@@ -354,7 +530,7 @@ static GLboolean fghChangeDisplayMode( GLboolean haveToTest )
  */
 void FGAPIENTRY glutGameModeString( const char* string )
 {
-    int width = 640, height = 480, depth = 16, refresh = 72;
+    int width = -1, height = -1, depth = -1, refresh = -1;
 
     FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGameModeString" );
 
@@ -377,13 +553,18 @@ void FGAPIENTRY glutGameModeString( const char* string )
                                     string
                                 );
 
-    /* Hopefully it worked, and if not, we still have the default values */
+    /* All values not specified are now set to -1, which means those
+     * aspects of the current display mode are not changed in
+     * fghChangeDisplayMode() above.
+     */
     fgState.GameModeSize.X  = width;
     fgState.GameModeSize.Y  = height;
     fgState.GameModeDepth   = depth;
     fgState.GameModeRefresh = refresh;
 }
 
+
+
 /*
  * Enters the game mode
  */
@@ -391,28 +572,28 @@ int FGAPIENTRY glutEnterGameMode( void )
 {
     FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutEnterGameMode" );
 
-    if( fgStructure.GameMode )
-        fgAddToWindowDestroyList( fgStructure.GameMode );
+    if( fgStructure.GameModeWindow )
+        fgAddToWindowDestroyList( fgStructure.GameModeWindow );
     else
         fghRememberState( );
 
     if( ! fghChangeDisplayMode( GL_FALSE ) )
     {
         fgWarning( "failed to change screen settings" );
-        return FALSE;
+        return 0;
     }
 
-    fgStructure.GameMode = fgCreateWindow(
-        NULL, "FREEGLUT", 0, 0,
-        fgState.GameModeSize.X, fgState.GameModeSize.Y, GL_TRUE, GL_FALSE
+    fgStructure.GameModeWindow = fgCreateWindow(
+        NULL, "FREEGLUT", GL_TRUE, 0, 0,
+        GL_TRUE, fgState.GameModeSize.X, fgState.GameModeSize.Y,
+        GL_TRUE, GL_FALSE
     );
 
-    fgStructure.GameMode->State.IsGameMode = GL_TRUE;
+    fgStructure.GameModeWindow->State.Width  = fgState.GameModeSize.X;
+    fgStructure.GameModeWindow->State.Height = fgState.GameModeSize.Y;
+    fgStructure.GameModeWindow->State.NeedToResize = GL_TRUE;
 
-#if TARGET_HOST_UNIX_X11
-
-    /* Move the window up to the topleft corner */
-    XMoveWindow( fgDisplay.Display, fgStructure.Window->Window.Handle, 0, 0 );
+#if TARGET_HOST_POSIX_X11
 
     /*
      * Sync needed to avoid a real race, the Xserver must have really created
@@ -420,15 +601,6 @@ int FGAPIENTRY glutEnterGameMode( void )
      */
     XSync( fgDisplay.Display, False );
 
-    /* Move the Pointer to the middle of the fullscreen window */
-    XWarpPointer(
-        fgDisplay.Display,
-        None,
-        fgDisplay.RootWindow,
-        0, 0, 0, 0,
-        fgState.GameModeSize.X/2, fgState.GameModeSize.Y/2
-    );
-
     /*
      * Grab the pointer to confine it into the window after the calls to
      * XWrapPointer() which ensure that the pointer really enters the window.
@@ -439,12 +611,12 @@ int FGAPIENTRY glutEnterGameMode( void )
      * the application which we have to aviod, so wait until it's viewable:
      */
     while( GrabSuccess != XGrabPointer(
-               fgDisplay.Display, fgStructure.GameMode->Window.Handle,
+               fgDisplay.Display, fgStructure.GameModeWindow->Window.Handle,
                TRUE,
                ButtonPressMask | ButtonReleaseMask | ButtonMotionMask
                | PointerMotionMask,
                GrabModeAsync, GrabModeAsync,
-               fgStructure.GameMode->Window.Handle, None, CurrentTime) )
+               fgStructure.GameModeWindow->Window.Handle, None, CurrentTime) )
         usleep( 100 );
 
     /*
@@ -453,12 +625,21 @@ int FGAPIENTRY glutEnterGameMode( void )
      */
     XSetInputFocus(
         fgDisplay.Display,
-        fgStructure.GameMode->Window.Handle,
+        fgStructure.GameModeWindow->Window.Handle,
         RevertToNone,
         CurrentTime
     );
 
-#   ifdef X_XF86VidModeSetViewPort
+    /* Move the Pointer to the middle of the fullscreen window */
+    XWarpPointer(
+        fgDisplay.Display,
+        None,
+        fgDisplay.RootWindow,
+        0, 0, 0, 0,
+        fgState.GameModeSize.X/2, fgState.GameModeSize.Y/2
+    );
+
+#   ifdef HAVE_X11_EXTENSIONS_XF86VMODE_H
 
     if( fgDisplay.DisplayModeValid )
     {
@@ -466,7 +647,8 @@ int FGAPIENTRY glutEnterGameMode( void )
         Window child;
 
         /* Change to viewport to the window topleft edge: */
-        XF86VidModeSetViewPort( fgDisplay.Display, fgDisplay.Screen, 0, 0 );
+        if( !XF86VidModeSetViewPort( fgDisplay.Display, fgDisplay.Screen, 0, 0 ) )
+            fgWarning( "XF86VidModeSetViewPort failed" );
 
         /*
          * Final window repositioning: It could be avoided using an undecorated
@@ -477,14 +659,14 @@ int FGAPIENTRY glutEnterGameMode( void )
         /* Get the current postion of the drawable area on screen */
         XTranslateCoordinates(
             fgDisplay.Display,
-            fgStructure.Window->Window.Handle,
+            fgStructure.CurrentWindow->Window.Handle,
             fgDisplay.RootWindow,
             0, 0, &x, &y,
             &child
         );
 
         /* Move the decorataions out of the topleft corner of the display */
-        XMoveWindow( fgDisplay.Display, fgStructure.Window->Window.Handle,
+        XMoveWindow( fgDisplay.Display, fgStructure.CurrentWindow->Window.Handle,
                      -x, -y);
     }
 
@@ -493,7 +675,7 @@ int FGAPIENTRY glutEnterGameMode( void )
     /* Grab the keyboard, too */
     XGrabKeyboard(
         fgDisplay.Display,
-        fgStructure.GameMode->Window.Handle,
+        fgStructure.GameModeWindow->Window.Handle,
         FALSE,
         GrabModeAsync, GrabModeAsync,
         CurrentTime
@@ -501,7 +683,7 @@ int FGAPIENTRY glutEnterGameMode( void )
 
 #endif
 
-    return TRUE;
+    return fgStructure.GameModeWindow->ID;
 }
 
 /*
@@ -511,14 +693,12 @@ void FGAPIENTRY glutLeaveGameMode( void )
 {
     FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutLeaveGameMode" );
 
-    freeglut_return_if_fail( fgStructure.GameMode );
-
-    fgStructure.GameMode->State.IsGameMode = GL_FALSE;
+    freeglut_return_if_fail( fgStructure.GameModeWindow );
 
-    fgAddToWindowDestroyList( fgStructure.GameMode );
-    fgStructure.GameMode = NULL;
+    fgAddToWindowDestroyList( fgStructure.GameModeWindow );
+    fgStructure.GameModeWindow = NULL;
 
-#if TARGET_HOST_UNIX_X11
+#if TARGET_HOST_POSIX_X11
 
     XUngrabPointer( fgDisplay.Display, CurrentTime );
     XUngrabKeyboard( fgDisplay.Display, CurrentTime );
@@ -538,7 +718,7 @@ int FGAPIENTRY glutGameModeGet( GLenum eWhat )
     switch( eWhat )
     {
     case GLUT_GAME_MODE_ACTIVE:
-        return !!fgStructure.GameMode;
+        return !!fgStructure.GameModeWindow;
 
     case GLUT_GAME_MODE_POSSIBLE:
         return fghChangeDisplayMode( GL_TRUE );
@@ -559,7 +739,7 @@ int FGAPIENTRY glutGameModeGet( GLenum eWhat )
         /*
          * This is true if the game mode has been activated successfully..
          */
-        return !!fgStructure.GameMode;
+        return !!fgStructure.GameModeWindow;
     }
 
     fgWarning( "Unknown gamemode get: %d", eWhat );