#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

float delta=0;

void init(void) {
  glClearColor (0.0, 0.0, 0.0, 0.0);
  glShadeModel (GL_FLAT);
}

void display(void) {
/* Check this shit out, yo.
http://gamedev.stackexchange.com/questions/12885/help-understanding-glulookat
WhatisthisIdon'teven.*/
  glClear (GL_COLOR_BUFFER_BIT);
  glColor3f (1.0, 1.0, 1.0);
  glLoadIdentity ();             /* clear the matrix */
          /* viewing transformation  */
  gluLookAt (0.0+delta, 0.0-delta, 6.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
  glScalef (1.0, 2.0, 1.0);      /* modeling transformation */ 
  glutWireCube (1.0);
  glFlush ();
}
void reshape (int w, int h) {
  glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();
  glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 20.0);
  glMatrixMode (GL_MODELVIEW);
}

void mousefunc(int button,int state,int x,int y) {
  switch(button) {
    case GLUT_LEFT_BUTTON:
      delta++;
      glutPostRedisplay();
      break;
    case GLUT_RIGHT_BUTTON:
      delta=0;
      glutPostRedisplay();
      break;
  }
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
  glutInitWindowSize (500, 500); 
  glutInitWindowPosition (100, 100);
  glutCreateWindow (argv[0]);
  init ();
  glutDisplayFunc(display); 
  glutReshapeFunc(reshape);
  glutMouseFunc(mousefunc);
  glutMainLoop();
  return 0;
}