Function DrawPowerupSparkles

Descent3/renderobject.cpp:1852–1931

Do powerup sparkles and stuff

// Do powerup sparkles and stuff
void DrawPowerupSparkles(object *obj) {
  extern bool Render_mirror_for_room;
  if (!Render_powerup_sparkles)
    return;

  if (Game_paused)
    return;

  // we want to render if
  // a) we are not rendering in a mirror
  // b) we are rendering a mirror but the object is not visible from our position
  if (Render_mirror_for_room && !IsPointVisible(&obj->pos, obj->size, NULL))
    return;

  if (obj->render_type != RT_POLYOBJ)
    return;

  // check to see if it's time to update
  if (Last_powerup_sparkle_time < POWERUP_SPARKLE_INTERVAL)
    return;

  int num_sparks = ps_rand() & 7;
  float obj_size_delta = obj->size * 0.3f;

  // Create some sparks
  for (int i = 0; i < num_sparks; ++i) {
    const int randnum = ps_rand() % 10;

    int index;
    switch (randnum) {
    case 0:
      index = HOT_SPARK_INDEX;
      break;
    case 1:
      index = COOL_SPARK_INDEX;
      break;
    default:
      index = GRAY_SPARK_INDEX;
      break;
    }

    vector pos_delta;
    pos_delta.x = (ps_rand() % 100) - 50;
    pos_delta.y = (ps_rand() % 100) - 80;
    pos_delta.z = (ps_rand() % 100) - 50;
    vm_NormalizeVector(&pos_delta);
    pos_delta = obj->last_pos + (obj_size_delta * pos_delta);

    int sparknum = VisEffectCreate(VIS_FIREBALL, index, obj->roomnum, &pos_delta);
    if (sparknum >= 0) {
      vis_effect *vis = &VisEffects[sparknum];

      vis->end_pos = vis->pos;
      vis->movement_type = MT_PHYSICS;
      vis->mass = 1000.0f;
      vis->drag = 0.2f;
      vis->phys_flags |= PF_GRAVITY | PF_NO_COLLIDE;