-extern void glb_sphere_init(void);
-extern glb_vertex *glb_sphere_get_vertices(int *nr_vertices);
-extern glb_triangle *glb_sphere_get_triangles(int *nr_triangles);
-extern void glb_sphere_end(void);
+extern glb_data * glb_sphere_init(void);
+extern glb_vertex *glb_sphere_get_vertices(glb_data *, int *nr_vertices);
+extern glb_triangle *glb_sphere_get_triangles(glb_data *, int *nr_triangles);
+extern void glb_sphere_end(glb_data *);