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/* $Id$ */
/** @file yapf_node_rail.hpp */
#ifndef YAPF_NODE_RAIL_HPP
#define YAPF_NODE_RAIL_HPP
/** key for cached segment cost for rail YAPF */
struct CYapfRailSegmentKey
{
uint32 m_value;
FORCEINLINE CYapfRailSegmentKey(const CYapfRailSegmentKey& src) : m_value(src.m_value) {}
FORCEINLINE CYapfRailSegmentKey(const CYapfNodeKeyTrackDir& node_key) {Set(node_key);}
FORCEINLINE void Set(const CYapfRailSegmentKey& src) {m_value = src.m_value;}
FORCEINLINE void Set(const CYapfNodeKeyTrackDir& node_key) {m_value = (((int)node_key.m_tile) << 3) | node_key.m_td;}
FORCEINLINE int32 CalcHash() const {return m_value;}
FORCEINLINE TileIndex GetTile() const {return (TileIndex)(m_value >> 3);}
FORCEINLINE bool operator == (const CYapfRailSegmentKey& other) const {return m_value == other.m_value;}
};
/* Enum used in PfCalcCost() to see why was the segment closed. */
enum EndSegmentReason {
/* The following reasons can be saved into cached segment */
ESR_DEAD_END = 0, ///< track ends here
ESR_RAIL_TYPE, ///< the next tile has a different rail type than our tiles
ESR_INFINITE_LOOP, ///< infinite loop detected
ESR_SEGMENT_TOO_LONG, ///< the segment is too long (possible infinite loop)
ESR_CHOICE_FOLLOWS, ///< the next tile contains a choice (the track splits to more than one segments)
ESR_DEPOT, ///< stop in the depot (could be a target next time)
ESR_WAYPOINT, ///< waypoint encountered (could be a target next time)
ESR_STATION, ///< station encountered (could be a target next time)
/* The following reasons are used only internally by PfCalcCost().
* They should not be found in the cached segment. */
ESR_PATH_TOO_LONG, ///< the path is too long (searching for the nearest depot in the given radius)
ESR_FIRST_TWO_WAY_RED, ///< first signal was 2-way and it was red
ESR_LOOK_AHEAD_END, ///< we have just passed the last look-ahead signal
ESR_TARGET_REACHED, ///< we have just reached the destination
/* Special values */
ESR_NONE = 0xFF, ///< no reason to end the segment here
};
enum EndSegmentReasonBits {
ESRB_NONE = 0,
ESRB_DEAD_END = 1 << ESR_DEAD_END,
ESRB_RAIL_TYPE = 1 << ESR_RAIL_TYPE,
ESRB_INFINITE_LOOP = 1 << ESR_INFINITE_LOOP,
ESRB_SEGMENT_TOO_LONG = 1 << ESR_SEGMENT_TOO_LONG,
ESRB_CHOICE_FOLLOWS = 1 << ESR_CHOICE_FOLLOWS,
ESRB_DEPOT = 1 << ESR_DEPOT,
ESRB_WAYPOINT = 1 << ESR_WAYPOINT,
ESRB_STATION = 1 << ESR_STATION,
ESRB_PATH_TOO_LONG = 1 << ESR_PATH_TOO_LONG,
ESRB_FIRST_TWO_WAY_RED = 1 << ESR_FIRST_TWO_WAY_RED,
ESRB_LOOK_AHEAD_END = 1 << ESR_LOOK_AHEAD_END,
ESRB_TARGET_REACHED = 1 << ESR_TARGET_REACHED,
/* Additional (composite) values. */
/* What reasons mean that the target can be fond and needs to be detected. */
ESRB_POSSIBLE_TARGET = ESRB_DEPOT | ESRB_WAYPOINT | ESRB_STATION,
/* What reasons can be stored back into cached segment. */
ESRB_CACHED_MASK = ESRB_DEAD_END | ESRB_RAIL_TYPE | ESRB_INFINITE_LOOP | ESRB_SEGMENT_TOO_LONG | ESRB_CHOICE_FOLLOWS | ESRB_DEPOT | ESRB_WAYPOINT | ESRB_STATION,
/* Reasons to abort pathfinding in this direction. */
ESRB_ABORT_PF_MASK = ESRB_DEAD_END | ESRB_PATH_TOO_LONG | ESRB_INFINITE_LOOP | ESRB_FIRST_TWO_WAY_RED,
};
DECLARE_ENUM_AS_BIT_SET(EndSegmentReasonBits);
/** cached segment cost for rail YAPF */
struct CYapfRailSegment
{
typedef CYapfRailSegmentKey Key;
CYapfRailSegmentKey m_key;
TileIndex m_last_tile;
Trackdir m_last_td;
int m_cost;
TileIndex m_last_signal_tile;
Trackdir m_last_signal_td;
EndSegmentReasonBits m_end_segment_reason;
CYapfRailSegment* m_hash_next;
FORCEINLINE CYapfRailSegment(const CYapfRailSegmentKey& key)
: m_key(key)
, m_last_tile(INVALID_TILE)
, m_last_td(INVALID_TRACKDIR)
, m_cost(-1)
, m_last_signal_tile(INVALID_TILE)
, m_last_signal_td(INVALID_TRACKDIR)
, m_end_segment_reason(ESRB_NONE)
, m_hash_next(NULL)
{}
FORCEINLINE const Key& GetKey() const {return m_key;}
FORCEINLINE TileIndex GetTile() const {return m_key.GetTile();}
FORCEINLINE CYapfRailSegment* GetHashNext() {return m_hash_next;}
FORCEINLINE void SetHashNext(CYapfRailSegment* next) {m_hash_next = next;}
};
/** Yapf Node for rail YAPF */
template <class Tkey_>
struct CYapfRailNodeT
: CYapfNodeT<Tkey_, CYapfRailNodeT<Tkey_> >
{
typedef CYapfNodeT<Tkey_, CYapfRailNodeT<Tkey_> > base;
typedef CYapfRailSegment CachedData;
CYapfRailSegment *m_segment;
uint16 m_num_signals_passed;
union {
uint32 m_inherited_flags;
struct {
bool m_targed_seen : 1;
bool m_choice_seen : 1;
bool m_last_signal_was_red : 1;
} flags_s;
} flags_u;
SignalType m_last_red_signal_type;
FORCEINLINE void Set(CYapfRailNodeT* parent, TileIndex tile, Trackdir td, bool is_choice)
{
base::Set(parent, tile, td, is_choice);
m_segment = NULL;
if (parent == NULL) {
m_num_signals_passed = 0;
flags_u.m_inherited_flags = 0;
m_last_red_signal_type = SIGTYPE_NORMAL;
} else {
m_num_signals_passed = parent->m_num_signals_passed;
flags_u.m_inherited_flags = parent->flags_u.m_inherited_flags;
m_last_red_signal_type = parent->m_last_red_signal_type;
}
flags_u.flags_s.m_choice_seen |= is_choice;
}
FORCEINLINE TileIndex GetLastTile() const {assert(m_segment != NULL); return m_segment->m_last_tile;}
FORCEINLINE Trackdir GetLastTrackdir() const {assert(m_segment != NULL); return m_segment->m_last_td;}
FORCEINLINE void SetLastTileTrackdir(TileIndex tile, Trackdir td) {assert(m_segment != NULL); m_segment->m_last_tile = tile; m_segment->m_last_td = td;}
};
// now define two major node types (that differ by key type)
typedef CYapfRailNodeT<CYapfNodeKeyExitDir> CYapfRailNodeExitDir;
typedef CYapfRailNodeT<CYapfNodeKeyTrackDir> CYapfRailNodeTrackDir;
// Default NodeList types
typedef CNodeList_HashTableT<CYapfRailNodeExitDir , 10, 12> CRailNodeListExitDir;
typedef CNodeList_HashTableT<CYapfRailNodeTrackDir, 12, 16> CRailNodeListTrackDir;
#endif /* YAPF_NODE_RAIL_HPP */
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