static int spawn_particle(struct psys_emitter *em, struct psys_particle *p);
static void update_particle(struct psys_emitter *em, struct psys_particle *p, long tm, float dt, void *cls);
static int spawn_particle(struct psys_emitter *em, struct psys_particle *p);
static void update_particle(struct psys_emitter *em, struct psys_particle *p, long tm, float dt, void *cls);