/* Auteur: Nicolas JANEY               */
/* Avril 2001                          */
/* Illustration de l'utilisation       */
/* des listes d'affichage en OpenGL    */
/* et de l'avantage en rapidite        */
/* qu'elles apportent.                  */

#include <windows.h>

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

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <sys/timeb.h>

#define PI 3.14159

static int l = 0 ;

void cercle() { 
  GLint i ; 
  GLfloat cosinus,sinus ; 
  glBegin(GL_POLYGON) ; 
  for ( i = 0 ; i < 100 ; i++ ) { 
    cosinus =(float) cos(i*2*PI/100.0); 
    sinus =(float) sin(i*2*PI/100.0); 
    glVertex2f(cosinus,sinus) ; } 
  glEnd() ; 
}

void CALLBACK display(void) { 
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(0.0F,0.0F,0.0F);
  struct timeb t1 ;
  struct timeb t2 ;
  ftime(&t1);
  for ( int k = 0 ; k < 3000 ; k++ )
    for ( int j = 0 ; j < 3 ; j++ )
      for ( int i = 0 ; i < 3 ; i++ ) {
        glPushMatrix();
        glTranslatef(-3.0F+3*i,-3.0F+3*j,(float) -k) ;
        if ( l )
          cercle();
          else
          glCallList(1) ; 
        glPopMatrix(); }
  ftime(&t2);
  int milli = ((int) t2.time - (int) t1.time)*1000 + (int) t2.millitm - (int) t1.millitm ;
  printf("%d millisecondes\n",milli) ;
  glFlush();
  auxSwapBuffers();
} 
  
void cercleListe() { 
  GLint i ; 
  GLfloat cosinus,sinus ; 
  glNewList(1,GL_COMPILE) ; 
  glBegin(GL_POLYGON) ; 
  for ( i = 0 ; i < 100 ; i++ ) { 
    cosinus =(float) cos(i*2*PI/100.0); 
    sinus =(float) sin(i*2*PI/100.0); 
    glVertex2f(cosinus,sinus) ; } 
  glEnd() ; 
  glEndList() ; 
} 
 
void myinit(void) {
  glClearColor(1.0,1.0,1.0,1.0);
  cercleListe() ;
} 
  
void CALLBACK myReshape(int w,int h) { 
  glViewport(0,0,w,h); 
  glMatrixMode(GL_PROJECTION); 
  glLoadIdentity(); 
  gluPerspective(85.,(float)w/(float)h,1.0,20.0); 
  glMatrixMode(GL_MODELVIEW); 
  glLoadIdentity(); 
  glTranslatef(0.0,0.0,-5.0); 
} 
  
void CALLBACK keyL(void) {  
  l++;
  l %= 2;
}

void CALLBACK keyl(void) { 
  l++;
  l %= 2;
}

void main(void) { 
  auxInitDisplayMode(AUX_DOUBLE|AUX_RGB); 
  auxInitPosition(0,0,200,200); 
  auxInitWindow("Liste d'affichage"); 
  myinit(); 
  auxKeyFunc(AUX_L,keyL);
  auxKeyFunc(AUX_l,keyl);
  auxReshapeFunc(myReshape); 
  auxMainLoop(display); 
}