/* Auteur: Nicolas JANEY                    */
/* nicolas.janey@univ-fcomte.fr             */
/* Juin 2001                                */
/* Examen de TD 2000-2001 : Question 1      */
/* Modelisation a base de facettes carrees  */

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

#include <stdio.h>
#include <math.h>

#include "ModuleReshape.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"

/* ************************************************** */

/* -------------------------------------------------- */
/* La fonction myinit initialise les fonctionnalites  */
/* suivantes :                                        */
/*   - une gestion des parties cachees                */
/*   - normalisation des normales specifiees          */
/* -------------------------------------------------- */
void myinit(void) {
  glDepthFunc(GL_LESS);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_NORMALIZE) ;
}
/* -------------------------------------------------- */
/* Dessin d'une facette de cote 1                     */
/* -------------------------------------------------- */
void facette(void) {
  glBegin(GL_QUADS);
  glNormal3f(0.0F,0.0F,1.0F);
  glVertex2f(0.0F,0.0F);
  glVertex2f(1.0F,0.0F);
  glVertex2f(1.0F,1.0F);
  glVertex2f(0.0F,1.0F);
  glEnd();
}
/* -------------------------------------------------- */
/* Dessin d'un damier de facettes de cote 1           */
/* -------------------------------------------------- */
void scene(int n) {
  glPushMatrix();
  float dp =(float) -n/2;
  for ( int i = 0 ; i < n ; i++ )
    for ( int j = 0 ; j < n ; j++ ) {
      glPushMatrix();
      glTranslatef(dp+i,dp+j,0.0F);
      facette();
      glPopMatrix(); }
  glPopMatrix();
}
/* -------------------------------------------------- */
/* La fonction display affiche une surface de 40x40   */
/* facettes sous un spot en position (0,0,100)        */
/* oriente en (0,0,-1) et 5° d'ouverture              */
/* -------------------------------------------------- */
void display(void) {
  glClearColor(0.3F,0.3F,0.3F,0.0F);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  GLfloat spot_diffuse[] = { 1.0F,0.0F,0.0F,1.0F };
  GLfloat spot_specular[] = { 1.0F,0.0F,0.0F,1.0F };
  GLfloat spot_position[] = { 0.0F,0.0F,100.0F,1.0F };
  GLfloat spot_direction[] = { 0.0F,0.0F,-1.0F };
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glLightfv(GL_LIGHT0,GL_DIFFUSE,spot_diffuse);
  glLightfv(GL_LIGHT0,GL_SPECULAR,spot_specular);
  glLightfv(GL_LIGHT0,GL_POSITION,spot_position);
  glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION,spot_direction);
  glLightf(GL_LIGHT0,GL_SPOT_CUTOFF,5.0F);
  scene(45);
  glPopMatrix();
  glFlush();
  glutSwapBuffers();
}
/* -------------------------------------------------- */
void main(void) {
  glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
  glutInitWindowPosition(10,10);
  glutInitWindowSize(300,300);
  glutCreateWindow("Exercice 1 : Modelisation par facettes carrees");
  myinit();
  creationMenuBasique();
  setParametresOrthoBasique(-25.0,25.0,-25.0,25.0,-500.0,500.0);
  setManipulateurDistance(1.0F);
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(keyBasique);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutDisplayFunc(display);
  glutMainLoop();
}

/* ************************************************** */