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; }