Function BOA_IsVisible

Descent3/BOA.cpp:525–560

  return ((BOA_Array[s_index][e_index] & BOAF_BLOCKAGE) != 0);
}
bool BOA_IsVisible(int start_room, int end_room) {
  int s_index = start_room;
  int e_index = end_room;

  if (!BOA_vis_valid)
    return true;

  if (start_room == end_room)
    return true;

  if (start_room == -1 || end_room == -1) {
    return false;
  }

  if ((!ROOMNUM_OUTSIDE(s_index)) && s_index <= Highest_room_index) {
    if (!Rooms[s_index].used) {
      return false;
    }
  } else if (ROOMNUM_OUTSIDE(s_index)) {
    s_index = TERRAIN_REGION(start_room) + Highest_room_index + 1;
  } else {
    ASSERT(s_index <= Highest_room_index + MAX_BOA_TERRAIN_REGIONS);
  }

  if ((!ROOMNUM_OUTSIDE(e_index)) && e_index <= Highest_room_index) {
    if (!Rooms[e_index].used) {
      return false;
    }
  } else if (ROOMNUM_OUTSIDE(e_index)) {
    e_index = TERRAIN_REGION(end_room) + Highest_room_index + 1;
  } else {
    ASSERT(e_index <= Highest_room_index + MAX_BOA_TERRAIN_REGIONS);
  }

  return ((BOA_Array[s_index][e_index] & BOAF_VIS) != 0);
}

int BOA_GetNextRoom(int start_room, int end_room) {
  int s_index = start_room;