GLUT pop-up menus - opengl

Question

Is it easy to create GLUT pop-up menus for my OpenGL application? If yes, how?

Answer 1

Creating and using pop-up menus with GLUT is very simple. Here is a code sample that creates a pop-up menu with 4 options:
// Menu items
enum MENU_TYPE
{
MENU_FRONT,
MENU_SPOT,
MENU_BACK,
MENU_BACK_FRONT,
};
// Assign a default value
MENU_TYPE show = MENU_BACK_FRONT;
// Menu handling function declaration
void menu(int);
int main()
{
// ...
// Create a menu
glutCreateMenu(menu);
// Add menu items
glutAddMenuEntry("Show Front", MENU_FRONT);
glutAddMenuEntry("Show Back", MENU_BACK);
glutAddMenuEntry("Spotlight", MENU_SPOT);
glutAddMenuEntry("Blend 'em all", MENU_BACK_FRONT);
// Associate a mouse button with menu
glutAttachMenu(GLUT_RIGHT_BUTTON);
// ...
return;
}
// Menu handling function definition
void menu(int item)
{
switch (item)
{
case MENU_FRONT:
case MENU_SPOT:
case MENU_DEPTH:
case MENU_BACK:
case MENU_BACK_FRONT:
{
show = (MENU_TYPE) item;
}
break;
default:
{ /* Nothing */ }
break;
}
glutPostRedisplay();
return;
}