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

#include "Utils.h"

#define MAX 50

static int spm = 0;
static int spl = 0;
static float dc[MAX][4];
static float ac[MAX][4];
static float sc[MAX][4];
static float ec[MAX][4];
static float sh[MAX];
static int numl[MAX];

int premiereLumiereDisponible(void) {
  int numl = GL_LIGHT1;
  while ( glIsEnabled(numl) )
    numl++ ;
  return(numl);
}

void empileMaterial(void) {
  glGetMaterialfv(GL_FRONT,GL_DIFFUSE,dc[spm]);
  glGetMaterialfv(GL_FRONT,GL_AMBIENT,ac[spm]);
  glGetMaterialfv(GL_FRONT,GL_SPECULAR,sc[spm]);
  glGetMaterialfv(GL_FRONT,GL_EMISSION,ec[spm]);
  glGetMaterialfv(GL_FRONT,GL_SHININESS,&sh[spm]);
  spm++;
}

void depileMaterial(void) {
  spm--;
  glMaterialfv(GL_FRONT,GL_DIFFUSE,dc[spm]);
  glMaterialfv(GL_FRONT,GL_AMBIENT,ac[spm]);
  glMaterialfv(GL_FRONT,GL_SPECULAR,sc[spm]);
  glMaterialfv(GL_FRONT,GL_EMISSION,ec[spm]);
  glMaterialfv(GL_FRONT,GL_SHININESS,&sh[spm]);
}

void empileLights(void) {
  numl[spl] = premiereLumiereDisponible();
  spl++;
}

void depileLights(void) {
  spl--;
  int numl2 = premiereLumiereDisponible();
  for ( int l = numl[spl] ; l < numl2 ; l++ )
    glDisable(l);
}