/* Huit spheres colorees affichees */
/* par differentes cameras */
/* */
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2010 */
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
/* Variables et constantes globales */
static const float blanc[] = { 1.0F,1.0F,1.0F,1.0F };
static const float jaune[] = { 1.0F,1.0F,0.0F,1.0F };
static const float cyan[] = { 1.0F,0.0F,1.0F,1.0F };
static const float magenta[] = { 0.0F,1.0F,1.0F,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 };
static const float noir[] = { 0.0F,0.0F,0.0F,1.0F };
static const float gris[] = { 0.7F,0.7F,0.7F,1.0F };
static int vue = 0;
static int width;
static int height;
/* Fonction executee lors de la frappe */
/* d'une touche du clavier */
void keyboard(unsigned char key,int x,int y) {
switch ( key ) {
case 0x0D :
vue = (vue+1)%3;
glutPostRedisplay();
break;
case 0x1B :
exit(0);
break; }
}
/* Fonction d'initialisation des parametres */
/* OpenGL ne changeant pas au cours de la vie */
/* du programme */
void init(void) {
const GLfloat mat_shininess[] = { 50.0 };
glMaterialfv(GL_FRONT,GL_SPECULAR,blanc);
glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);
glLightfv(GL_LIGHT0,GL_DIFFUSE,gris);
glLightfv(GL_LIGHT1,GL_DIFFUSE,gris);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_CULL_FACE);
glClearColor(0.5F,0.5F,0.5F,0.5F);
}
/* Scene dessinee */
void scene(void) {
glPushMatrix();
glPushMatrix();
glTranslatef(2.0F,2.0F,2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,blanc);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(2.0F,2.0F,-2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,jaune);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(2.0F,-2.0F,2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,cyan);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(2.0F,-2.0F,-2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,rouge);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(-2.0F,2.0F,2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,magenta);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(-2.0F,2.0F,-2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,vert);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(-2.0F,-2.0F,2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,bleu);
glutSolidSphere(1.0,72,72);
glPopMatrix();
glPushMatrix();
glTranslatef(-2.0F,-2.0F,-2.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,noir);
glutSolidSphere(1.0,72,72);
glPopMatrix();
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 };
glViewport(0,0,width,height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
switch (vue) {
case 0:
gluPerspective(2.7F,(float) width/height,1.0,160.0);
break;
case 1:
gluPerspective(22.0F,(float) width/height,1.0,25.0);
break;
case 2:
gluPerspective(18.0F,(float) width/height,1.0,35.0);
break; }
glMatrixMode(GL_MODELVIEW) ;
glLoadIdentity() ;
glLightfv(GL_LIGHT0,GL_POSITION,light0_position);
glLightfv(GL_LIGHT1,GL_POSITION,light1_position);
glLightfv(GL_LIGHT2,GL_POSITION,light2_position);
switch (vue) {
case 0:
gluLookAt(0.0,0.0,150.0,0.0,0.0,0.0,0.0,1.0,0.0);
break;
case 1:
gluLookAt(0.0,0.0,-20.0,0.0,0.0,0.0,0.0,1.0,0.0);
break;
case 2:
gluLookAt(0.0,20.0,-20.0,0.0,0.0,0.0,0.0,1.0,0.0);
break; }
scene();
glFlush();
glutSwapBuffers();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("Erreur OpenGL\n",error);
}
/* Fonction executee lors d'un changement */
/* de la taille de la fenetre OpenGL */
/* -> Ajustement de la camera de visualisation */
void reshape(int w,int h) {
width = w;
height = h;
}
/* 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("Differents points de vue sur 8 spheres");
init();
glutKeyboardFunc(keyboard);
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}
RETOUR