/* Auteur: Nicolas JANEY                  */
/* nicolas.janey@univ-fcomte.fr           */
/* Avril 2001                             */
/* Illustration du clipping 3D en OpenGL  */

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

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

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

static int clip = 0 ;

void display(void) {
  double equ0[] = { 1.1,1.2,0.9,0.8 } ;
  double equ1[] = { -1.3,1.8,1.5,2.5 } ;
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glClipPlane(GL_CLIP_PLANE0,equ0);
  glClipPlane(GL_CLIP_PLANE1,equ1);
  if ( (clip & 0x01) != 0 )
    glEnable(GL_CLIP_PLANE0);
    else
    glDisable(GL_CLIP_PLANE0);
  if ( (clip & 0x02) != 0 )
    glEnable(GL_CLIP_PLANE1);
    else
    glDisable(GL_CLIP_PLANE1);
  glPopMatrix();
  glutSolidSphere(8.0,30,30);
  glPopMatrix();
  glFlush();
  glutSwapBuffers();
}

void myinit (void) {
  glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_TRUE);
  GLfloat shininesFront[] = { 50.0 };
  glClearColor(0.5,0.5,1.0,1.0) ;
  glMaterialfv(GL_FRONT,GL_SPECULAR,couleurBlanc());
  glMaterialfv(GL_FRONT,GL_SHININESS,shininesFront);
  GLfloat shininesBack[] = { 50.0 };
  glMaterialfv(GL_BACK,GL_SPECULAR,couleurBlanc());
  glMaterialfv(GL_BACK,GL_SHININESS,shininesBack);
  glMaterialfv(GL_BACK,GL_DIFFUSE,couleurRouge());
  GLfloat l_pos0[] = { 1.0,1.0,1.0,0.0 };
  glLightfv(GL_LIGHT0,GL_POSITION,l_pos0);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glDepthFunc(GL_LESS);
  glEnable(GL_DEPTH_TEST);
  glShadeModel(GL_SMOOTH);
}

void key(unsigned char key,int x,int y) {
  if ( keyManipulateur(key,x,y) )
    glutPostRedisplay();
    else
    switch ( key ) {
      case 32   : clip = (clip+1) %4;
                  glutPostRedisplay();
                  break; }
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(300,300); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Clipping"); 
  myinit(); 
  creationMenuBasique();
  setParametresOrthoBasique(-10.0,10.0,-10.0,10.0,-500.0,500.0);
  setManipulateurDistance(1.0F);
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(key);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}