Function SetRoomChangeOverTime

Descent3/room.cpp:1341–1378

Sets up a room to change its fog or wind over time

// Sets up a room to change its fog or wind over time
int SetRoomChangeOverTime(int roomnum, bool fog, vector *end, float depth_end, float time) {
  room *rp = &Rooms[roomnum];
  int index, i;

  // First search to see if there is another with this same roomnum

  int found = 0;
  for (i = 0; i < MAX_ROOM_CHANGES && !found; i++) {
    if (Room_changes[i].used && Room_changes[i].roomnum == roomnum && Room_changes[i].fog == fog) {
      found = 1;
      index = i;
    }
  }

  if (!found) {
    index = AllocRoomChange();
    if (index < 0)
      return -1; // failed get free slot!
  }

  Room_changes[index].roomnum = roomnum;
  Room_changes[index].fog = fog;
  Room_changes[index].end_vector = *end;
  Room_changes[index].start_time = Gametime;
  Room_changes[index].total_time = time;
  rp->room_change_flags |= RCF_CHANGING_WIND_FOG;

  if (fog) {
    Room_changes[index].start_depth = rp->fog_depth;
    Room_changes[index].start_vector.x = rp->fog_r;
    Room_changes[index].start_vector.y = rp->fog_g;
    Room_changes[index].start_vector.z = rp->fog_b;
    Room_changes[index].end_depth = depth_end;
  } else
    Room_changes[index].start_vector = rp->wind;

  return index;
}