int32 func_screenwidth () {
	while (!window_exists){Sleep(100);}
	return glutGet(GLUT_SCREEN_WIDTH);
}

int32 func_screenheight () {
	while (!window_exists){Sleep(100);}
	return glutGet(GLUT_SCREEN_HEIGHT);
}

void sub_screenicon () {
	while (!window_exists){Sleep(100);}
	glutIconifyWindow;
	return;
}