/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2008 */
/* OpenGL et GLUt */
#include <stdlib.h>
#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 vert[] = { 0.0F,1.0F,0.0F,1.0F };
static const float bleu[] = { 0.0F,0.0F,1.0F,1.0F };
static const float rouge[] = { 1.0F,0.0F,0.0F,0.5F };
static const float jaune[] = { 1.0F,1.0F,0.0F,0.5F };
static float rx = -50.0F;
static float r1 = 0.0F;
static float r2 = 0.0F;
static float dr1 = 0.31F;
static float dr2 = 1.81F;
static int anim = 1;
/* 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,blanc);
glLightfv(GL_LIGHT1,GL_DIFFUSE,blanc);
glLightfv(GL_LIGHT2,GL_DIFFUSE,blanc);
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);
glEnable(GL_CULL_FACE);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
}
/* Scene dessinee */
void scene(void) {
glPushMatrix();
glRotatef(r1,0.0F,0.0F,1.0F);
glTranslatef(10.0F,0.0F,0.0F);
glPushMatrix();
glRotatef(r2,0.0F,1.0F,0.0F);
glTranslatef(0.15F,0.0F,0.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,blanc);
glutSolidSphere(0.1F,36,36);
glPopMatrix();
glPushMatrix();
glRotatef(r2+120.0F,0.0F,1.0F,0.0F);
glTranslatef(0.15F,0.0F,0.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,vert);
glutSolidSphere(0.1F,36,36);
glPopMatrix();
glPushMatrix();
glRotatef(r2+240.0F,0.0F,1.0F,0.0F);
glTranslatef(0.15F,0.0F,0.0F);
glMaterialfv(GL_FRONT,GL_DIFFUSE,bleu);
glutSolidSphere(0.1F,36,36);
glPopMatrix();
glPopMatrix();
glMaterialfv(GL_FRONT,GL_DIFFUSE,rouge);
glutSolidTorus(0.3,10.0,36,180);
glMaterialfv(GL_FRONT,GL_DIFFUSE,jaune);
glPushMatrix();
for( int i = 0 ; i < 10 ; i++ ) {
glPushMatrix();
glRotatef(36.0F*i,0.0F,0.0F,1.0F);
glTranslatef(10.0F,0.0F,0.0F);
glutSolidCube(1.0F);
glPopMatrix(); }
glPopMatrix();
}
/* Fonction executee lorsqu'aucun evenement */
/* n'est en file d'attente */
void idle(void) {
r1 += dr1;
r2 += dr2;
glutPostRedisplay();
}
/* 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);
scene();
glPopMatrix();
glFlush();
glutSwapBuffers();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("Attention, erreur OpenGL %d\n",error);
}
/* 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(30.0F,(float) x/y,1.0,50.0) ;
glMatrixMode(GL_MODELVIEW) ;
glLoadIdentity() ;
gluLookAt(0.0,-7.0,25.0,0.0,-2.0,0.0,0.0,1.0,0.0);
}
/* Fonction executee lors de l'appui */
/* d'une touche du clavier */
void keyboard(unsigned char c,int x,int y) {
switch (c) {
case 43 :
dr1 *= 1.01F;
break;
case 45 :
dr1 /= 1.01F;
break;
case 0x1B :
exit(0);
break;
case 0x0D :
dr1 = -dr1;
break;
case 0x20 :
anim = !anim;
glutIdleFunc((anim) ? idle : NULL);
break; }
}
/* Fonction executee lors de l'appui */
/* d'une touche speciale du clavier */
void special(int c,int x,int y) {
switch (c) {
case GLUT_KEY_UP :
rx += 1.0F;
glutPostRedisplay();
break;
case GLUT_KEY_DOWN :
rx -= 1.0F;
glutPostRedisplay();
break; }
}
/* Fonction executee lors de l'appui */
/* d'une touche de la souris */
void mouse(int bouton,int etat,int x,int y) {
if ( bouton == GLUT_LEFT_BUTTON ) {
dr1 = -dr1; }
if ( ( bouton == GLUT_RIGHT_BUTTON ) && ( etat == GLUT_UP ) ) {
dr1 = -dr1; }
}
/* Fonction principale */
int main(int argc,char **argv) {
/* Initialisation de l'affichage */
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
glutInitWindowSize(450,250);
glutInitWindowPosition(50,50);
glutCreateWindow("Programmation événementielle avec GLUt");
/* Initialisation d'un certain nombre */
/* de parametres d'OpenGL */
init();
/* Specification des fonctions de gestion */
/* evenementielle */
glutIdleFunc(idle);
glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutDisplayFunc(display);
/* Boucle principale d'affichage */
/* et de gestion des evenements */
glutMainLoop();
return(0);
}
RETOUR