#include <GL/glut.h>
#include "travail.h"


void tracerScene(Objet *obj) {

  static float g = 0;

  glEnable(GL_STENCIL_TEST);
  glClear(GL_STENCIL_BUFFER_BIT);

  glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);

  // Activation du stencil
  glStencilFunc(GL_ALWAYS, 1, 1);

  glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);


  obj->gonfler(0.8);
  obj->tracer();
  obj->gonfler(-0.8);


  // Trace le petit objet à l'intéreiur
  glDepthFunc(GL_ALWAYS);

  glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);

  obj->gonfler(0.2);
  obj->tracer();
  obj->gonfler(-0.2);


  // Reactivation du Z & clear
  glDepthFunc(GL_LESS);
  glClear(GL_DEPTH_BUFFER_BIT);

  // Reactivation des couleurs
  glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

  // Tracage qu'à l'endroit nécessaire
  glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
  glStencilFunc(GL_EQUAL, 1, 1);

  // Tracer l'entourage
  glPushMatrix();
  glLoadIdentity();
  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  glOrtho(-1, 1, -1, 1, -1, 1);

  glDisable(GL_LIGHTING);
  glColor3f(0, 1, 0);
  glBegin(GL_POLYGON);
  glVertex3f(-1, -1, 0);
  glVertex3f(1, -1, 0);
  glVertex3f(1, 1, 0);
  glVertex3f(-1, 1, 0);
  glEnd();
  glEnable(GL_LIGHTING);
  glPopMatrix();
  glMatrixMode(GL_MODELVIEW);
  glPopMatrix();
  
  // Revenir a un tracé normal
  glStencilFunc(GL_ALWAYS, 1, 1);

  // Dessin de l'objet
  glColor3f(1,0,0);

  obj->tracer();

  g += 0.01;

  // Dessin des boules
  glColor3f(0,0,1);
  for(int j=0;j<5;j++) {
    for(int i=0;i<5;i++) {
      glPushMatrix();
      glTranslatef(5.0*(i-2),5.0*(j-2),-20);
      glutSolidSphere(1,10,10);
      glPopMatrix();
    }
  }
}