var size = X_ViewPort_getWindowSize();
if( X_ViewPort_width !== size[ 0 ] || X_ViewPort_height !== size[ 1 ] ){
X_ViewPort_width = size[ 0 ];
X_ViewPort_height = size[ 1 ];
var size = X_ViewPort_getWindowSize();
if( X_ViewPort_width !== size[ 0 ] || X_ViewPort_height !== size[ 1 ] ){
X_ViewPort_width = size[ 0 ];
X_ViewPort_height = size[ 1 ];