/* Auteur: Nicolas JANEY           */
/* nicolas.janey@univ-fcomte.fr    */
/* Septembre 2004                  */
/* Animation, gestion du clavier   */
/* et camera                       */

#include <stdlib.h>

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

static int l = 1;
static int anim = 1;
static float az = 0.0F;
static int obj = 1;

void idle(void) {
  az += 1.0F;
  glutPostRedisplay();
}

void special(int key,int x,int y) {
  switch ( key ) {
    case GLUT_KEY_F2 : obj = !obj;
                       glutPostRedisplay();
                       break; }
}

void key(unsigned char key,int x,int y) {
  switch ( key ) {
    case ' '  : anim = !anim;
                glutIdleFunc((anim) ? idle : NULL);
                break;
    case 0x0D : l = !l ;
                glutPostRedisplay();
                break;
    case 0x1B : exit(0); }
}

void reshape(int tx,int ty) {
  glViewport(0,0,tx,ty);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho((double) -3*tx/ty,(double) 3*tx/ty,-3.0,3.0,-3.0,3.0) ;
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void display(void) {
  glClearColor(0.8F,0.8F,0.8F,1.0F) ;
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT) ;
  if ( l )
    glEnable(GL_LIGHTING);
    else
    glDisable(GL_LIGHTING);
  glPushMatrix();
  glRotatef(az,0.0F,0.0F,1.0F);
  glPushMatrix();
  glTranslatef(1.5F,0.0F,0.0F);
  if ( obj )
    glutSolidSphere(1.0,36,36);
    else
    glutWireSphere(1.0,18,12);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(-1.5F,0.0F,0.0F);
  if ( obj )
    glutSolidCube(2.0);
    else
    glutWireCube(2.0);
  glPopMatrix();
  glPopMatrix();
  glFlush() ;
  glutSwapBuffers();
}

void init(void) {
  GLfloat l_pos[] = { 0.0F,0.0F,1.0F,0.0F };
  GLfloat c[4] = { 0.5F,0.2F,0.6F,1.0F };
  glMaterialfv(GL_FRONT,GL_DIFFUSE,c);
  glLightfv(GL_LIGHT0,GL_POSITION,l_pos);
  glEnable(GL_LIGHT0);
  glColor4fv(c) ;
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_NORMALIZE);
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
  glutInitWindowSize(240,240); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Animation, clavier et caméra");
  init(); 
  glutReshapeFunc(reshape);
  glutKeyboardFunc(key);
  glutSpecialFunc(special);
  glutDisplayFunc(display);
  glutIdleFunc(idle);
  glutMainLoop();
  return(0);
}