typedef enum {
    AXES,			// whether axes are drawn
    BB,				// whether the bounding box is drawn
    IMMERSE,			// whether to reduce radius so eye is closer
    LIGHTING,			// whether lighting is on
    LIGHTS,			// whether lights are shown
    SMOOTH,			// whether shading is flat or smooth
    FULL_SCREEN,		// whether to use the whole screen
    FILTER_NEAREST,		// mag and min filter: linear (default) or nearest
    NUM_TOGGLES			// used only for array limits
} toggles_t;

// A bunch of booleans we might want
static bool Toggles[NUM_TOGGLES];
    
void makeToggleMenu();

int RightMenu;

void rightMenuCallback(int id) {
    Toggles[id] = ! Toggles[id]; // toggle it
    // remake the menu
    glutDestroyMenu(RightMenu);
    makeToggleMenu();
    if(IMMERSE == id ) twZview();
    if(FULL_SCREEN == id) {
	if( Toggles[FULL_SCREEN] ) {
	    twFullScreen();
	} else {
	    twWindow();
	}
    }
    glutPostRedisplay();
}

void makeToggleMenu() {
    RightMenu = glutCreateMenu(rightMenuCallback);
    glutAddMenuEntry(Toggles[AXES]?"Hide Axes":"Show Axes",AXES);
    glutAddMenuEntry(Toggles[BB]?"Hide Bounding Box":"Show Bounding Box",BB);
    glutAddMenuEntry(Toggles[IMMERSE]?"Back up":"Immerse",IMMERSE);
    glutAddMenuEntry(Toggles[LIGHTING]?"Disable Lighting":"Enable Lighting",LIGHTING);
    glutAddMenuEntry(Toggles[LIGHTS]?"Hide Lights":"Show Lights",LIGHTS);
    glutAddMenuEntry(Toggles[SMOOTH]?"Flat Shading":"Smooth Shading",SMOOTH);
    glutAddMenuEntry(Toggles[FULL_SCREEN]?"Window":"Full Screen",FULL_SCREEN);
    glutAddMenuEntry(Toggles[FILTER_NEAREST]?"Filter: Linear":"Filter: Nearest",FILTER_NEAREST);
    glutAttachMenu(GLUT_RIGHT_BUTTON);
}