Lumières colorées et lumières blanches sur un cube sans normales
Lumières colorées et lumières blanches sur un cube sans normales
Lumières colorées et lumières blanches sur un cube avec normales
Le source : EnsembleFacettesCube.cpp
/* Cubes modelises par facettes */
/* */
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2009 */
#include <stdlib.h>
#include <stdio.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
/* Variables et constantes globales */
/* pour les angles et les couleurs utilises */
static int obj = 0;
static float rx = 0.0F;
static float ry = 0.0F;
static float rz = 0.0F;
static const float blanc[] = { 1.0F,1.0F,1.0F,1.0F };
static const float gris[] = { 0.7F,0.7F,0.7F,1.0F };
static const float jaune[] = { 1.0F,1.0F,0.0F,1.0F };
static const float rouge[] = { 1.0F,0.0F,0.0F,1.0F };
static const float vert[] = { 0.0F,1.0F,0.0F,1.0F };
static const float bleu[] = { 0.0F,0.0F,1.0F,1.0F };
/* Fonction d'initialisation des parametres */
/* OpenGL ne changeant pas au cours de la vie */
/* du programme */
void init(void) {
const GLfloat shininess[] = { 50.0 };
glMaterialfv(GL_FRONT,GL_SPECULAR,blanc);
glMaterialfv(GL_FRONT,GL_SHININESS,shininess);
glLightfv(GL_LIGHT0,GL_DIFFUSE,rouge);
glLightfv(GL_LIGHT1,GL_DIFFUSE,jaune);
glLightfv(GL_LIGHT2,GL_DIFFUSE,bleu);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHT2);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glEnable(GL_AUTO_NORMAL);
}
/* Scene dessinee */
void cubeSansNormales(void){
float c = 0.5F;
glPushMatrix();
glBegin(GL_QUADS);
{ glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glVertex3f(c,c,c);
glVertex3f(-c,c,c);
glVertex3f(-c,-c,c);
glVertex3f(c,-c,c); }
{ glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,-c,c);
glVertex3f(-c,c,c); }
{ glVertex3f(c,c,c);
glVertex3f(c,-c,c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glVertex3f(-c,-c,c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,-c,c); }
{ glVertex3f(c,c,c);
glVertex3f(c,c,-c);
glVertex3f(-c,c,-c);
glVertex3f(-c,c,c); }
glEnd();
glPopMatrix();
}
void cubeAvecNormales(){
float c = 0.5F;
glPushMatrix();
glNormal3f(0.0F,0.0F,1.0F);
glBegin(GL_QUADS);
{ glNormal3f(0.0F,0.0F,-1.0F);
glVertex3f(c,c,-c);
glVertex3f(c,-c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,c,-c); }
{ glNormal3f(0.0F,0.0F,1.0F);
glVertex3f(c,c,c);
glVertex3f(-c,c,c);
glVertex3f(-c,-c,c);
glVertex3f(c,-c,c); }
{ glNormal3f(-1.0F,0.0F,0.0F);
glVertex3f(-c,c,-c);
glVertex3f(-c,-c,-c);
glVertex3f(-c,-c,c);
glVertex3f(-c,c,c); }
{ glNormal3f(1.0F,0.0F,0.0F);
glVertex3f(c,c,c);
glVertex3f(c,-c,c);
glVertex3f(c,-c,-c);
glVertex3f(c,c,-c); }
{ glNormal3f(0.0F,-1.0F,0.0F);
glVertex3f(-c,-c,c);
glVertex3f(-c,-c,-c);
glVertex3f(c,-c,-c);
glVertex3f(c,-c,c); }
{ glNormal3f(0.0F,1.0F,0.0F);
glVertex3f(c,c,c);
glVertex3f(c,c,-c);
glVertex3f(-c,c,-c);
glVertex3f(-c,c,c); }
glEnd();
glPopMatrix();
}
void scene() {
glPushMatrix();
if ( obj )
cubeAvecNormales();
else
cubeSansNormales();
glPopMatrix();
}
/* Fonction executee lors d'un rafraichissement */
/* de la fenetre de dessin */
void display(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
const GLfloat light0_position[] = { 1.0,1.0,1.0,0.0 };
const GLfloat light1_position[] = { -1.0,1.0,1.0,0.0 };
const GLfloat light2_position[] = { 1.0,-1.0,1.0,0.0 };
glLightfv(GL_LIGHT0,GL_POSITION,light0_position);
glLightfv(GL_LIGHT1,GL_POSITION,light1_position);
glLightfv(GL_LIGHT2,GL_POSITION,light2_position);
glPushMatrix();
glRotatef(rx,1.0F,0.0F,0.0F);
glRotatef(ry,0.0F,1.0F,0.0F);
glRotatef(rz,0.0F,0.0F,1.0F);
scene();
glPopMatrix();
glFlush();
glutSwapBuffers();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("Erreur OpenGL\n",error);
}
/* Fonction executee lorsqu'aucun evenement */
/* n'est en file d'attente */
void idle(void) {
rx += 0.4256F + (rand()%1000)/1000.0F ;
ry += 0.6117F ;
rz += 0.4174F ;
glutPostRedisplay() ;
}
/* Fonction executee lors d'un changement */
/* de la taille de la fenetre OpenGL */
void reshape(int x,int y) {
glViewport(0,0,x,y);
glMatrixMode(GL_PROJECTION) ;
glLoadIdentity() ;
gluPerspective(7.0F,(float) x/y,1.0,40.0) ;
glMatrixMode(GL_MODELVIEW) ;
glLoadIdentity() ;
gluLookAt(0.0,0.0,20.0,0.0,0.0,0.0,0.0,1.0,0.0);
}
/* Fonction executee lors de l'appui */
/* d'une touche alphanumerique du clavier */
void keyboard(unsigned char key,int x,int y) {
switch (key) {
case 'l' :
{ static int lumiere = 0;
lumiere = !lumiere;
if ( lumiere ) {
glLightfv(GL_LIGHT0,GL_DIFFUSE,gris);
glLightfv(GL_LIGHT1,GL_DIFFUSE,gris);
glLightfv(GL_LIGHT2,GL_DIFFUSE,gris);
glEnable(GL_CULL_FACE); }
else {
glLightfv(GL_LIGHT0,GL_DIFFUSE,rouge);
glLightfv(GL_LIGHT1,GL_DIFFUSE,jaune);
glLightfv(GL_LIGHT2,GL_DIFFUSE,bleu);
glDisable(GL_CULL_FACE); } }
glutPostRedisplay();
break;
case 'c' :
{ static int culling = 0;
culling = !culling;
if ( culling )
glEnable(GL_CULL_FACE);
else
glDisable(GL_CULL_FACE); }
glutPostRedisplay();
break;
case 'f' :
{ static int face = 1;
face = !face;
glPolygonMode(GL_FRONT_AND_BACK,( face ) ? GL_FILL : GL_LINE); }
glutPostRedisplay();
break;
case 0x20 :
obj = !obj;
glutPostRedisplay();
break;
case 0x0D :
{ static int anim = 1;
anim = !anim;
glutIdleFunc(( anim ) ? idle : NULL); }
break;
case 0x1B :
exit(0);
break; }
}
/* Fonction executee lors de l'appui */
/* d'une touche de curseur ou d'une touche */
/* page up ou page down */
void special(int key,int x,int y) {
switch(key) {
case GLUT_KEY_UP :
rx++;
glutPostRedisplay() ;
break;
case GLUT_KEY_DOWN :
rx--;
glutPostRedisplay() ;
break;
case GLUT_KEY_LEFT :
ry++;
glutPostRedisplay() ;
break;
case GLUT_KEY_RIGHT :
ry--;
glutPostRedisplay() ;
break;
case GLUT_KEY_PAGE_UP :
rz++;
glutPostRedisplay() ;
break;
case GLUT_KEY_PAGE_DOWN :
rz--;
glutPostRedisplay() ;
break; }
}
/* Fonction principale */
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
glutInitWindowSize(300,300);
glutInitWindowPosition(50,50);
glutCreateWindow("Cubes modélisés par facettes");
init();
glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutReshapeFunc(reshape);
glutIdleFunc(idle);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}
RETOUR