void GLCtrl::Create()
{
	Ctrl *top = GetTopCtrl();
	if(!top)
		return;
	
	GdkWindow *gdk = top->gdk();
	if(!gdk)
		return;

	Window w = gdk_x11_drawable_get_xid((GdkDrawable *)gdk);
	
	ONCELOCK {
		s_Display = gdk_x11_drawable_get_xdisplay((GdkDrawable *)gdk);
		int samples = numberOfSamples;

		do {
			Vector<int> attr;
			attr << GLX_RGBA << GLX_DEPTH_SIZE << depthSize
			     << GLX_STENCIL_SIZE << stencilSize;
			if(doubleBuffering)
				attr << GLX_DOUBLEBUFFER;
			if(samples > 1)
				attr << GLX_SAMPLE_BUFFERS_ARB << 1 << GLX_SAMPLES_ARB << samples;
			attr << 0;
			samples >>= 1;
			s_XVisualInfo = glXChooseVisual(s_Display, DefaultScreen(s_Display), attr);
		}
		while(!s_XVisualInfo && samples > 0);
		if(!s_XVisualInfo)
			return;
		s_Colormap = XCreateColormap(s_Display, RootWindow(s_Display, s_XVisualInfo->screen), s_XVisualInfo->visual, AllocNone);
		s_GLXContext = glXCreateContext(s_Display, s_XVisualInfo, NULL, GL_TRUE);
	}
	
	if(!s_GLXContext)
		return;

	XSetWindowAttributes swa;
	swa.colormap = s_Colormap;
	swa.border_pixel = 0;
	swa.event_mask = 0;
 
	win = XCreateWindow(s_Display, w, 0, 0, 1, 1, 0,
                        s_XVisualInfo->depth, InputOutput, s_XVisualInfo->visual,
                        CWBorderPixel|CWColormap|CWEventMask, &swa);
	visible = false;
	position = Null;
}