/// <summary>
/// Given an empty position in the grid, find all of the viable room prefabs
/// for that position that meets the following requirements:
/// - PrefabHasRequiredDirections: Neighbouring rooms may have
/// doors that need to lead into a room at the given position, and the
/// random prefab must have associated doors so that the doors in
/// the neighbouring rooms are not blocked off.
/// - PrefabIsEnclosedIfRequired: At the end of level generation,
/// the final chosen room prefabs must be fully enclosed so that the level
/// does not contain doors that lead to nowhere.
/// - PrefabHasSpaceInFrontOfDoors: Similar to PrefabHasRequiredDirections,
/// neighbouring rooms may NOT have a door that leads into a room at
/// the given position, so the chosen prefab must not have a door
/// in that direction as it would be blocked off by the existing
/// neighbouring room.
/// - GuaranteedPrefabHasNotBeenSpawned: Prefabs marked as
/// guaranteed spawn for a given depth should only be spawned once
/// for that depth. If the prefab was already spawned, it is no
/// longer viable.
/// </summary>
/// <param name="position">
/// The position in the grid of rooms. The units used are relative
/// to the starting room. So 0,0 is the starting room. 1,0 is the
/// room east of that, etc.
/// </param>
/// <param name="enclosedPrefabRequired">
/// Whether or not the random prefab needs to be enclosed, meaning
/// all of its doors will connect to already existing rooms and the
/// room will contain no unconnected doors.
/// </param>
/// <returns>
/// An array of room prefabs that meets the requirements for the given position.
/// </returns>
private GameObject[] FindViablePrefabsFor(Vector2Int position, bool enclosedPrefabRequired, float depthPercentage)
{
HashSet <Direction> requiredDirections = FindRequiredDirectionsFor(position);
bool PrefabHasRequiredDirections(GameObject prefab)
{
RoomConnectionBehaviour prefabRoom = prefab.GetComponent <RoomConnectionBehaviour>();
return(requiredDirections.All(direction => prefabRoom.Directions.Contains(direction)));
}
bool PrefabIsEnclosedIfRequired(GameObject prefab)
{
if (!enclosedPrefabRequired)
{
return(true);
}
RoomConnectionBehaviour prefabRoom = prefab.GetComponent <RoomConnectionBehaviour>();
return(requiredDirections.SetEquals(prefabRoom.Directions));
}
bool PrefabHasSpaceInFrontOfDoors(GameObject prefab)
{
RoomConnectionBehaviour prefabRoom = prefab.GetComponent <RoomConnectionBehaviour>();
bool DoorNotRequired(DoorConnectionBehaviour door) => !requiredDirections.Contains(door.Direction);
IEnumerable <DoorConnectionBehaviour> nonRequiredDoors = prefabRoom.Doors.Where(DoorNotRequired);
return(nonRequiredDoors.All(door => PositionInDirectionIsEmpty(position, door.Direction)));
}
bool OnlyOnceGuaranteePrefabHasNotBeenSpawned(GameObject prefab)
{
RoomGenerationBehaviour roomGenerationBehaviour = prefab.GetComponent <RoomGenerationBehaviour>();
SpawnProbability? spawnProbability = roomGenerationBehaviour.GetSpawnProbability(depthPercentage);
if (spawnProbability.HasValue && spawnProbability.Value.Guarantee == SpawnProbability.SpawnGuarantee.SpawnOnlyOnce)
{
return(!HasSpawnedGuaranteedRoomPrefab(prefab, spawnProbability.Value.DepthPercentage));
}
return(true);
}
IEnumerable <GameObject> viablePrefabs = _roomPrefabs
.Where(PrefabHasRequiredDirections)
.Where(PrefabIsEnclosedIfRequired)
.Where(PrefabHasSpaceInFrontOfDoors)
.Where(OnlyOnceGuaranteePrefabHasNotBeenSpawned);
return(viablePrefabs.ToArray());
}
/// <summary>
/// Verifies that the RoomGrid has placed all guaranteed rooms,
/// this is used as a fail-safe to ensure the level is not missing
/// vital rooms.
/// </summary>
/// <returns>
/// true if the RoomGrid contains all of the guaranteed rooms level
/// otherwise false.
/// </returns>
public bool Verify()
{
foreach (GameObject roomPrefab in _roomPrefabs)
{
RoomGenerationBehaviour roomGenerationBehaviour = roomPrefab.GetComponent <RoomGenerationBehaviour>();
List <SpawnProbability> spawnProbabilities = roomGenerationBehaviour.SpawnProbabilities;
foreach (SpawnProbability spawnProbability in spawnProbabilities)
{
if (spawnProbability.Guarantee == SpawnProbability.SpawnGuarantee.None)
{
continue;
}
bool verified = HasSpawnedGuaranteedRoomPrefab(roomPrefab, spawnProbability.DepthPercentage);
if (!verified)
{
return(false);
}
}
}
return(true);
}