/* Une molecule de benzene : C6H6 */ /* */ /* Auteur: Nicolas JANEY */ /* nicolas.janey@univ-fcomte.fr */ /* Septembre 2011 */ #include #include #include #include #include #include /* Variables et constantes globales */ #ifndef M_PI #define M_PI 3.14159 #endif 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 float rx = 0.0F; static float ry = 0.0F; static float rz = 0.0F; static int objet = 0; static int aff = 1; GLbyte *lireImageRaw(int tx,int ty,char *filename) { GLbyte *img = NULL; FILE *file = fopen(filename,"rb"); if ( file ) { img =(GLbyte *) calloc(tx*ty*3,sizeof(GLbyte)); fread(img,1,tx*ty*3,file); fclose(file); } return(img); } /* Fonction executee lors de la frappe */ /* d'une touche du clavier */ void keyboard(unsigned char key,int x,int y) { switch ( key ) { case 0x20 : aff = (aff+1)%2; glutPostRedisplay(); break; case 0x0D : objet = (objet+1)%2; glutPostRedisplay(); 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 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); glLightfv(GL_LIGHT2,GL_DIFFUSE,gris); 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); GLbyte *image = lireImageRaw(16,16,"Damier.raw"); if ( image ) { glPixelStorei(GL_UNPACK_ALIGNMENT,1); glTexImage2D(GL_TEXTURE_2D,0,3,16,16,0,GL_RGB,GL_UNSIGNED_BYTE,image); free(image); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glEnable(GL_TEXTURE_2D); } } /* Scene dessinee */ void mySolidCylinder(float hauteur,float rayon,int ns,int nl) { GLboolean nm = glIsEnabled(GL_NORMALIZE); if ( !nm ) glEnable(GL_NORMALIZE); float normale[4]; glGetFloatv(GL_CURRENT_NORMAL,normale); glPushMatrix(); for ( int j = 0 ; j < nl ; j++ ) { float hi = hauteur/2-j*hauteur/nl; float si =(float) j/nl; float hf = hi-hauteur/nl; float sf =(float) (j+1)/nl; glBegin(GL_QUAD_STRIP); for( int i = 0 ; i <= ns ; i++ ) { float a = (2*M_PI*i)/ns; float t =(float) i/ns; float cs = cos(a); float sn = -sin(a); glNormal3f(cs,0.0F,sn); float x = rayon*cs; float z = rayon*sn; glTexCoord2f(si,t); glVertex3f(x,hi,z); glTexCoord2f(sf,t); glVertex3f(x,hf,z); } glEnd(); } glPopMatrix(); glNormal3f(normale[0],normale[1],normale[2]); if ( !nm ) glDisable(GL_NORMALIZE); } void scene(void) { glPushMatrix(); mySolidCylinder(3.5F,1.7F,36,5); 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); glPolygonMode(GL_FRONT_AND_BACK,(aff) ? GL_FILL : GL_LINE); 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: %d\n",error); } /* Fonction executee lors d'un changement */ /* de la taille de la fenetre OpenGL */ /* -> Ajustement de la camera de visualisation */ void reshape(int x,int y) { glViewport(0,0,x,y); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(20.0F,(float) x/y,1.0,50.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0.0,10.0,15.0,0.0,0.0,0.0,0.0,1.0,0.0); } /* 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("Un cylindre texturé"); init(); glutKeyboardFunc(keyboard); glutSpecialFunc(special); glutReshapeFunc(reshape); glutDisplayFunc(display); glutMainLoop(); return(0); }