engine: client: fool proof R_SaveVideoMode

engine/client/vid_common.c

@@ -66,19 +66,25 @@ void VID_InitDefaultResolution( void )
 R_SaveVideoMode
 =================
 */
-void R_SaveVideoMode( int w, int h , int render_w, int render_h )
+void R_SaveVideoMode( int w, int h, int render_w, int render_h )
 {
+	host.renderinfo_changed = false;
+
+	if( !w || !h || !render_w || !render_h )
+		return;
+
 	host.window_center_x = w / 2;
 	host.window_center_y = h / 2;
 
 	Cvar_SetValue( "width", w );
 	Cvar_SetValue( "height", h );
 
+	if( refState.width == render_w && refState.height == render_h )
+		return;
+
 	refState.width = render_w;
 	refState.height = render_h;
 
-	host.renderinfo_changed = false;
-
 	// check for 4:3 or 5:4
 	if( render_w * 3 != render_h * 4 && render_w * 4 != render_h * 5 )
 		refState.wideScreen = true;