GLUT Tutorial - Creating Menus and Submenus in GLUT

GLUT supports simple cascading pop-up menus. They are designed to let a user select various modes within a program. The functionality is simple and minimalistic and is meant to be that way. Do not mistake GLUT’s pop-up menu facility with an attempt to create a full-featured user interface. glutCreateMenu creates a Menu in GLUT. The syntax of glutCreateMenu is

int glutCreateMenu(void (*func)(int value));

This function defines the callback that has to be called when a menu item was selected. This callback function has one parameter, the value. This function returns an int, this is the menu identifier. This identifier is needed when you would want to attach this menu as a submenu. This is illustrated in sample example later.