/* Auteur: Nicolas JANEY */ /* nicolas.janey@univ-fcomte.fr */ /* Octobre 2008 */ /* Un programme OpenGL illustrant l'utilisation */ /* de lumieres et d'un materiel */ #include #include #include #include #include #include /* Variables globales */ static int obj = 0; static float rx = 0.0F; static float ry = 0.0F; static int mouvement = 0 ; static int button = 0 ; static int mx; static int my; /* Fonction executee lors de l'appui */ /* d'une touche de la souris */ void mouse(int bouton,int etat,int x,int y) { button = bouton; mx = x ; my = y ; if ( etat == GLUT_DOWN ) { mouvement = 1 ; } if ( etat == GLUT_UP ) { mouvement = 0 ; } } /* Fonction executee lors du deplacement */ /* de la souris devant la fenetre */ /* avec le bouton appuye */ void motion(int x,int y) { switch ( button ) { case GLUT_LEFT_BUTTON : if ( mouvement == 1 ) { rx += (y-my) ; ry += (x-mx) ; mx = x; my = y; glutPostRedisplay(); } break; } } /* Fonction d'initialisation des parametres */ /* OpenGL ne changeant pas au cours de la vie */ /* du programme */ void init(void) { glEnable(GL_LIGHTING); glDepthFunc(GL_LESS); glEnable(GL_DEPTH_TEST); glEnable(GL_NORMALIZE); glEnable(GL_AUTO_NORMAL); } /* Fonction de modelisation de la scene */ void scene(int obj) { glEnable(GL_LIGHTING); { { float c[4] = { 2.0F,0.0F,0.0F,1.0F }; glLightfv(GL_LIGHT0,GL_DIFFUSE,c); glLightfv(GL_LIGHT0,GL_SPECULAR,c); } { float dir[4] = { 1.0F,1.0F,1.0F,0.0F }; glLightfv(GL_LIGHT0,GL_POSITION,dir); } glEnable(GL_LIGHT0); } { { float c[4] = { 0.0F,1.0F,0.0F,1.0F }; glLightfv(GL_LIGHT1,GL_DIFFUSE,c); glLightfv(GL_LIGHT1,GL_SPECULAR,c); } { float pos[4] = { -5.0F,-5.0F,15.0F,1.0F }; glLightfv(GL_LIGHT1,GL_POSITION,pos); } glEnable(GL_LIGHT1); } { { float c[4] = { 0.0F,0.0F,1.0F,1.0F }; glLightfv(GL_LIGHT2,GL_DIFFUSE,c); glLightfv(GL_LIGHT2,GL_SPECULAR,c); } { float pos[4] = { -1.0F,1.0F,15.0F,1.0F }; glLightfv(GL_LIGHT2,GL_POSITION,pos); } { float dir[4] = { 1.0F,-1.0F,-15.0F }; glLightfv(GL_LIGHT2,GL_SPOT_DIRECTION,dir); } glLightf(GL_LIGHT2,GL_SPOT_CUTOFF,8.594374F); glLightf(GL_LIGHT2,GL_SPOT_EXPONENT,0.0F); glEnable(GL_LIGHT2); } { float t[4] = { 0.0F,0.0F,0.0F,1.0F }; glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,t); } { float t[4] = { 0.0F,0.0F,0.0F,1.0F }; glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT,t); } { float t[4] = { 0.4F,0.8F,0.2F,1.0F }; glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,t); } { float t[4] = { 0.0F,0.0F,0.0F,1.0F }; glMaterialfv(GL_FRONT_AND_BACK,GL_EMISSION,t); } glPushMatrix(); switch (obj) { case 0 : { float t[4] = { 6.40F }; glMaterialfv(GL_FRONT_AND_BACK,GL_SHININESS,t); } glRotatef(57.295826F,1.10F,-1.0F,0.0F); glutSolidCube(6.0); break; case 1 : { float t[4] = { 32.0F }; glMaterialfv(GL_FRONT_AND_BACK,GL_SHININESS,t); } glutSolidSphere(4.0,180,180); break; } glPopMatrix(); } /* Fonction executee lors d'un rafraichissement */ /* de la fenetre de dessin */ void display(void) { glClearColor(0.6F,0.6F,0.6F,1.0F) ; glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT) ; /* Affichage de la scene */ glPushMatrix(); glRotatef(rx,1.0F,0.0F,0.0F); glRotatef(ry,0.0F,1.0F,0.0F); scene(obj); 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 */ /* Configuration d'une camera de visualisation */ /* en projection en perspective */ void reshape(int tx,int ty) { glViewport(0,0,tx,ty); glMatrixMode(GL_PROJECTION); glLoadIdentity(); float ratio =(float) tx/ty; gluPerspective(6.302541F,ratio,1.0,1000.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(-0.0F,-0.0F,-100.0F); } /* Fonction executee lors de la frappe */ /* d'une touche alphanumerique du clavier */ void keyboard(unsigned char key,int x,int y) { switch ( key ) { case ' ' : obj = (obj+1)%2; glutPostRedisplay(); break; case 0x1B : exit(0); } } /* Fonction principale */ int main(int argc,char **argv) { glutInit(&argc,argv); glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE|GLUT_DEPTH); glutInitWindowSize(250,250); glutInitWindowPosition(50,50); glutCreateWindow("Lumieres et materiel"); init(); glutMouseFunc(mouse); glutMotionFunc(motion); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutDisplayFunc(display); glutMainLoop(); return(0); }