#define WIREFRAME		100
#define COLOR			102
#define LIGHT			103

#define SHADED			200
#define SHADED_FLAT		201
#define SHADED_SMOOTH	202


#include <stdio.h>
#include <GL/glut.h>


int id_MENU1; //ID menu 1
int id_MENU2; //ID sub menu 1

void mainWin(void)
{
	glClear(GL_COLOR_BUFFER_BIT);	
	glClearColor(0.0,0.0,0.0,0.0);
}


/*Funzione di Gestione del Menu*/
void menu1(int id_entry)
{

	
	switch(id_entry){
	case(WIREFRAME):
		printf("ID_entry: %d\n",id_entry);
		break;
	case(COLOR):
		printf("ID_entry: %d\n",id_entry);
		break;
	case(LIGHT):
		printf("ID_entry: %d\n",id_entry);
		break;		
	//Sub menu
	case(SHADED_FLAT):
		printf("ID_entry: %d\n",id_entry);
		break;
	case(SHADED_SMOOTH):
		printf("ID_entry: %d\n",id_entry);
		break;

	default:
		printf("Default: %d\n",id_entry);
		break;
		
	}
}


void InitGlut(void)
{
	glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
	glutInitWindowSize(300,300);
	glutInitWindowPosition(50,50);

	glutCreateWindow("Menu"); //Creo TOP-LEVEL Window

	//Creazione MENU 1
	id_MENU1=glutCreateMenu(menu1);				//Creo il CURRENT-MENU
	glutAddMenuEntry("Wire Frame",WIREFRAME);	//Inserisco le Entry
	glutAddMenuEntry("Color",COLOR);
	glutAddMenuEntry("Light",LIGHT);
	glutAddMenuEntry("----------------------",0);

	//Creazione MENU2
	id_MENU2=glutCreateMenu(menu1);
	glutAddMenuEntry("Flat",SHADED_FLAT);
	glutAddMenuEntry("Smooth", SHADED_SMOOTH);

	glutSetMenu(id_MENU1);				//Imposto il CURRENT-MENU
	glutAddSubMenu("Shaded",id_MENU2);	//Aggiungo il Sub-MENU
	glutAttachMenu(GLUT_RIGHT_BUTTON);

	//Registrazione CALL-BACK function
	glutDisplayFunc(mainWin);
}

void main(int argc, char *argv[])
{
	glutInit(&argc, argv);
		InitGlut();
	glutMainLoop();

}