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<pre> /***********************************************************
 * A Template for building OpenGL applications using GLUT
 *
 * Author: Perspective @ cprogramming.com
 * Date  : Jan, 2005
 *
 * Description: 
 *   This code initializes an OpenGL ready window
 * using GLUT.  Some of the most common callbacks
 * are registered to empty or minimal functions.
 *
 * This code is intended to be a quick starting point
 * when building GLUT applications.
 *
 ***********************************************************/
 
//#include <windows.h>
#include <iostream>
#include <GL/glut.h>
 
 
/* process menu option 'op' */
void menu(int op) {
 
  switch(op) {
  case 'Q':
  case 'q':
    exit(0);
  }
}
 
/* executed when a regular key is pressed */
void keyboardDown(unsigned char key, int x, int y) {
 
  switch(key) {
  case 'Q':
  case 'q':
  case  27:   // ESC
    exit(0);
  }
}
 
/* executed when a regular key is released */
void keyboardUp(unsigned char key, int x, int y) {
 
}
 
/* executed when a special key is pressed */
void keyboardSpecialDown(int k, int x, int y) {
 
}
 
/* executed when a special key is released */
void keyboardSpecialUp(int k, int x, int y) {
 
}
 
/* reshaped window */
void reshape(int width, int height) {
 
  GLfloat fieldOfView = 90.0f;
  glViewport (0, 0, (GLsizei) width, (GLsizei) height);
 
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(fieldOfView, (GLfloat) width/(GLfloat) height, 0.1, 500.0);
 
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}
 
/* executed when button 'button' is put into state 'state' at screen position ('x', 'y') */
void mouseClick(int button, int state, int x, int y) {
 
}