/* Auteur: Nicolas JANEY                */
/* Avril 2001                           */
/* Utilisation des cameras en OpenGL    */

#include <windows.h>

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

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

static float anglex = 0.0F ;
static int scene = 0 ;
static int width ;
static int height ;

void CALLBACK display(void) {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  glTranslatef(3.0f,3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  auxWireCube(2);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(-3.0f,3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  auxWireSphere(1);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(3.0f,-3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  auxWireCylinder(1,2);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(-3.0f,-3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  auxWireCone(1,2);
  glPopMatrix();
  glFlush();
  auxSwapBuffers();
}

void myinit (void) {
  glClearColor(0.5F,0.5F,0.5F,0.0F);
  glColor3f(1.0F,1.0F,1.0F);
  glEnable(GL_DEPTH_TEST);
}

void CALLBACK myReshape(int w, int h) {
  glViewport(0,0,w,h);
  width = w;
  height = h;
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(30,(double) w/h,5.0,40.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  switch ( scene ) {
    case 0 : glTranslatef(0.0f,0.0f,-20.0f);
             break;
    case 1 : glRotatef(-90.0f,0.0f,1.0f,0.0f);
             glTranslatef(-20.0f,0.0f,0.0f);
             break;
    case 2 : glRotatef(90.0f,1.0f,0.0f,0.0f);
             glTranslatef(0.0f,-20.0f,0.0f);
             break;
    case 3 : glRotatef(-45.0f,0.0f,1.0f,0.0f);
             glTranslatef(-20.0f,0.0f,-20.0f);
             break;
    case 4 : glRotatef(45.0f,1.0f,0.0f,0.0f);
             glTranslatef(0.0f,-20.0f,-20.0f);
             break;
    case 5 : glRotatef(-90.0f,-1.0f,1.0f,0.0f);
             glTranslatef(-20.0f,-20.0f,0.0f);
             break;
    case 6 : glRotatef(180.0f,-0.325f,-0.325f,-0.888f);
             glTranslatef(-20.0f,-20.0f,-20.0f);
             break;
    case 7 : glRotatef(-54.7356f,-1.0f,1.0f,0.0f);
             glTranslatef(-20.0f,-20.0f,-20.0f);
             break;
    case 8 : gluLookAt(20.0,20.0,20.0,0.0,0.0,0.0,0.0,1.0,0.0);
             break; }
}

void CALLBACK enter(void) {
  scene = (scene+1) % 9 ;
  myReshape(width,height);
}

void CALLBACK idle(void) {
  anglex++ ;
  display();
}

void main(void) {
  auxInitDisplayMode(AUX_DOUBLE|AUX_RGBA|AUX_DEPTH);
  auxInitPosition (0,0,300,300);
  auxInitWindow("Camera pour la perspective") ;
  myinit();
  auxKeyFunc(AUX_RETURN,enter) ;
  auxIdleFunc(idle);
  auxReshapeFunc(myReshape);
  auxMainLoop(display);
}