void particle_system_update(struct particle_system *ps, float dt) {
int i = 0;
if (ps->isActive) {
float rate = ps->config->emissionRate;
// emitCounter should not increase where ps->particleCount == ps->totalParticles
if (ps->particleCount < ps->config->totalParticles) {
ps->emitCounter += dt;
}
while (ps->particleCount < ps->config->totalParticles && ps->emitCounter > rate) {
_addParticle(ps);
ps->emitCounter -= rate;
}
ps->elapsed += dt;
if (ps->config->duration != DURATION_INFINITY && ps->config->duration < ps->elapsed) {
_stopSystem(ps);
}
}
while (i < ps->particleCount) {
struct particle *p = &ps->particles[i];
p->timeToLive -= dt;
if (p->timeToLive > 0) {
_update_particle(ps, p, dt);
if (p->size <= 0) {
_remove_particle(ps, i);
} else {
++i;
}
} else {
_remove_particle(ps, i);
}
}
ps->isAlive = ps->particleCount > 0;
}
void
p3d_emitter_update(struct p3d_emitter* et, float dt, float* mat) {
if (et->active) {
float rate = et->cfg->emission_time / et->cfg->count;
et->emit_counter += dt;
if (et->loop) {
while (et->emit_counter > rate) {
_add_particle_random(et, mat);
et->emit_counter -= rate;
}
} else {
if (!et->cfg->static_mode) {
while (et->emit_counter > rate && et->particle_count < et->cfg->count) {
_add_particle_random(et, mat);
++et->particle_count;
et->emit_counter -= rate;
}
} else {
if (!et->static_mode_finished) {
_add_particle_static(et, mat);
et->static_mode_finished = true;
}
}
}
}
struct p3d_particle* prev = NULL;
struct p3d_particle* curr = et->head;
while (curr) {
if (curr->ud) {
struct ps_vec2 pos;
ps_vec3_projection(&curr->pos, &pos);
UPDATE_FUNC(curr->ud, pos.x + mat[4], pos.y + mat[5]);
}
curr->life -= dt;
if (curr->life > 0) {
_update_speed(et, dt, curr);
_update_angle(et, dt, curr);
_update_position(et, dt, curr);
prev = curr;
curr = curr->next;
} else {
struct p3d_particle* next = curr->next;
if (prev) {
prev->next = next;
}
_remove_particle(et, curr);
if (et->head == curr) {
et->head = next;
if (!next) {
et->tail = NULL;
}
}
curr = next;
}
}
et->tail = prev;
}