Fullscren w WinApi

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void WindowImplWin32::switchToFullscreen( const VideoMode & mode )
{
    DEVMODE devMode;
    devMode.dmSize = sizeof( devMode );
    devMode.dmPelsWidth = mode.width;
    devMode.dmPelsHeight = mode.height;
    devMode.dmBitsPerPel = mode.bitsPerPixel;
    devMode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
   
    // Apply fullscreen mode
    if( ChangeDisplaySettingsW( & devMode, CDS_FULLSCREEN ) != DISP_CHANGE_SUCCESSFUL )
    {
        err() << "Failed to change display mode for fullscreen" << std::endl;
        return;
    }
   
    // Make the window flags compatible with fullscreen mode
    SetWindowLongW( m_handle, GWL_STYLE, WS_POPUP | WS_CLIPCHILDREN | WS_CLIPSIBLINGS );
    SetWindowLongW( m_handle, GWL_EXSTYLE, WS_EX_APPWINDOW );
   
    // Resize the window so that it fits the entire screen
    SetWindowPos( m_handle, HWND_TOP, 0, 0, mode.width, mode.height, SWP_FRAMECHANGED );
    ShowWindow( m_handle, SW_SHOW );
   
    // Set "this" as the current fullscreen window
    fullscreenWindow = this;
}