/* Auteur: Nicolas JANEY         */
/* nicolas.janey@univ-fcomte.fr  */
/* Avril 2001                    */
/* Des spheres animees           */

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

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

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

static float a = 0.0f ;
static int type = 0 ;
static int anim = 1 ;
static int maille = 0 ;

void myinit(void) {
  GLfloat light_position0[] = { 0.0F,0.0F,1.0F,0.0F };
  GLfloat light_position1[] = { 0.0F,0.0F,1.0F,0.0F };
  glLightfv(GL_LIGHT0,GL_AMBIENT,couleurNoir());
  glLightfv(GL_LIGHT0,GL_DIFFUSE,couleurBlanc());
  glLightfv(GL_LIGHT1,GL_DIFFUSE,couleurBlanc());
  glLightfv(GL_LIGHT0,GL_SPECULAR,couleurNoir());
  glLightfv(GL_LIGHT0,GL_POSITION,light_position0);
  glLightfv(GL_LIGHT1,GL_POSITION,light_position1);
  glEnable(GL_LIGHT0);
  glEnable(GL_LIGHT1);
  glEnable(GL_AUTO_NORMAL);
  glDepthFunc(GL_LESS);
  glEnable(GL_DEPTH_TEST);
  glClearAccum(0.0,0.0,0.0,0.0);
  setManipulateurClavierAngle(25.0F,20.0F,0.0F);
}

void axes() {
  glPushMatrix() ;
  glColor4fv(couleurRouge()) ;
  glBegin(GL_LINES) ;
  glVertex3f(0.0F,0.0F,0.0F) ;
  glVertex3f(1.0F,0.0F,0.0F) ;
  glEnd() ;
  placeFontCursor(1.05F,0.05F,0.05F);
  simpleBitmapOutput("x");
  glColor4fv(couleurVert()) ;
  glBegin(GL_LINES) ;
  glVertex3f(0.0F,0.0F,0.0F) ;
  glVertex3f(0.0F,1.0F,0.0F) ;
  glEnd() ;
  placeFontCursor(0.05F,1.05F,0.05F);
  simpleBitmapOutput("y");
  glColor4fv(couleurBleu()) ;
  glBegin(GL_LINES) ;
  glVertex3f(0.0F,0.0F,0.0F) ;
  glVertex3f(0.0F,0.0F,1.0F) ;
  glEnd() ;
  placeFontCursor(0.05F,0.05F,1.05F);
  simpleBitmapOutput("z");
  if ( maille ) {
    float gris[] = { 0.5F,0.5F,0.5F,1.0F };
    glColor4fv(gris) ;
    for ( int i = -100 ; i < 100 ; i++ ) {
      glBegin(GL_LINES) ;
      glVertex3f((float) i,0.0F,200.0F) ;
      glVertex3f((float) i,0.0F,-200.0F) ;
      glEnd() ;
      glBegin(GL_LINES) ;
      glVertex3f(200.0F,0.0F,(float) i) ;
      glVertex3f(-200.0F,0.0F,(float) i) ;
      glEnd() ; } }
  glPopMatrix() ;
}

void displayCotesSpheres(void) {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glPushMatrix();
  glRotatef(a,0.0f,1.0f,0.0f);
  glTranslatef(4.0F,0.0F,0.0F) ;
  glColor4fv(couleurRouge()) ;
  glutWireSphere(1.0,12,12) ;
  if ( type == 1 ) {
    glRotatef(a*5,0.0f,1.0f,0.0f);
    glTranslatef(2.0F,0.0F,0.0F) ;
    glColor4fv(couleurVert()) ;
    glutWireSphere(0.5,12,12) ; }
  glPopMatrix();
  axes() ;
  glPopMatrix();
  glAccum(GL_ACCUM,0.7F);
}

void displaySpheres(void) {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  manipulateurSouris();
  manipulateurClavier();
  glEnable(GL_LIGHTING);
  glRotatef(a,0.0f,1.0f,0.0f);
  glTranslatef(4.0F,0.0F,0.0F) ;
  glMaterialfv(GL_FRONT,GL_DIFFUSE,couleurRouge(0.5F));
  glutSolidSphere(1.0,12,12) ;
  if ( type == 1 ) {
    glRotatef(a*5,0.0f,1.0f,0.0f);
    glTranslatef(2.0F,0.0F,0.0F) ;
    glMaterialfv(GL_FRONT,GL_DIFFUSE,couleurVert(0.5F));
    glutWireSphere(0.5,12,12) ; }
  glDisable(GL_LIGHTING);
  glPopMatrix();
  glAccum(GL_ACCUM,0.3F);
}

void display(void) {
  glClear(GL_ACCUM_BUFFER_BIT);
  glPushMatrix() ;
  displaySpheres() ;
  displayCotesSpheres() ;
  glAccum(GL_RETURN,1.0);
  glPopMatrix() ;
  glFlush();
  glutSwapBuffers() ;
}

void idle(void) {
  a += 1.0f;
  glutPostRedisplay() ;
}

void key(unsigned char key,int x,int y) {
  if ( keyManipulateur(key,x,y) )
    glutPostRedisplay();
    else
    switch ( key ) {
      case 'a'  :
      case 'A'  : if ( anim )
                    glutIdleFunc(NULL) ;
                    else
                    glutIdleFunc(idle) ;
                  anim = 1-anim;
                  glutPostRedisplay();
                  break;
      case 0x0D : type = (type+1)%2 ;
                  glutPostRedisplay();
                  break;
      case 32   : maille = 1 - maille ;
                  glutPostRedisplay();
                  break; }
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE|GLUT_ACCUM);
  glutInitWindowSize(250,140); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Spheres animees"); 
  myinit(); 
  creationMenuBasique();
  setParametresOrthoBasique(-3.0,3.0,-3.0,3.0,-500.0,500.0);
  setManipulateurDistance(1.0F);
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(key);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutIdleFunc(idle);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}