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OpenTTD/src/yapf/yapf_costrail.hpp

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/* $Id$ */
/** @file yapf_costrail.hpp Cost determination for rails. */
#ifndef YAPF_COSTRAIL_HPP
#define YAPF_COSTRAIL_HPP
#include "../pbs.h"
template <class Types>
class CYapfCostRailT
: public CYapfCostBase
, public CostRailSettings
{
public:
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::TrackFollower TrackFollower;
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::CachedData CachedData;
protected:
/* Structure used inside PfCalcCost() to keep basic tile information. */
struct TILE {
TileIndex tile;
Trackdir td;
TileType tile_type;
RailType rail_type;
TILE()
{
tile = INVALID_TILE;
td = INVALID_TRACKDIR;
tile_type = MP_VOID;
rail_type = INVALID_RAILTYPE;
}
TILE(TileIndex tile, Trackdir td)
{
this->tile = tile;
this->td = td;
this->tile_type = GetTileType(tile);
this->rail_type = GetTileRailType(tile);
}
TILE(const TILE &src)
{
tile = src.tile;
td = src.td;
tile_type = src.tile_type;
rail_type = src.rail_type;
}
};
protected:
int m_max_cost;
CBlobT<int> m_sig_look_ahead_costs;
bool m_disable_cache;
public:
bool m_stopped_on_first_two_way_signal;
protected:
static const int s_max_segment_cost = 10000;
CYapfCostRailT()
: m_max_cost(0)
, m_disable_cache(false)
, m_stopped_on_first_two_way_signal(false)
{
// pre-compute look-ahead penalties into array
int p0 = Yapf().PfGetSettings().rail_look_ahead_signal_p0;
int p1 = Yapf().PfGetSettings().rail_look_ahead_signal_p1;
int p2 = Yapf().PfGetSettings().rail_look_ahead_signal_p2;
int *pen = m_sig_look_ahead_costs.GrowSizeNC(Yapf().PfGetSettings().rail_look_ahead_max_signals);
for (uint i = 0; i < Yapf().PfGetSettings().rail_look_ahead_max_signals; i++)
pen[i] = p0 + i * (p1 + i * p2);
}
/// to access inherited path finder
Tpf& Yapf() {return *static_cast<Tpf*>(this);}
public:
FORCEINLINE int SlopeCost(TileIndex tile, Trackdir td)
{
CPerfStart perf_cost(Yapf().m_perf_slope_cost);
if (!stSlopeCost(tile, td)) return 0;
return Yapf().PfGetSettings().rail_slope_penalty;
}
FORCEINLINE int CurveCost(Trackdir td1, Trackdir td2)
{
assert(IsValidTrackdir(td1));
assert(IsValidTrackdir(td2));
int cost = 0;
if (TrackFollower::Allow90degTurns()
&& ((TrackdirToTrackdirBits(td2) & (TrackdirBits)TrackdirCrossesTrackdirs(td1)) != 0)) {
// 90-deg curve penalty
cost += Yapf().PfGetSettings().rail_curve90_penalty;
} else if (td2 != NextTrackdir(td1)) {
// 45-deg curve penalty
cost += Yapf().PfGetSettings().rail_curve45_penalty;
}
return cost;
}
FORCEINLINE int SwitchCost(TileIndex tile1, TileIndex tile2, DiagDirection exitdir)
{
if (IsTileType(tile1, MP_RAILWAY) && IsTileType(tile2, MP_RAILWAY)) {
bool t1 = KillFirstBit(GetTrackBits(tile1) & DiagdirReachesTracks(ReverseDiagDir(exitdir))) != TRACK_BIT_NONE;
bool t2 = KillFirstBit(GetTrackBits(tile2) & DiagdirReachesTracks(exitdir)) != TRACK_BIT_NONE;
if (t1 && t2) return Yapf().PfGetSettings().rail_doubleslip_penalty;
}
return 0;
}
/** Return one tile cost (base cost + level crossing penalty). */
FORCEINLINE int OneTileCost(TileIndex& tile, Trackdir trackdir)
{
int cost = 0;
// set base cost
if (IsDiagonalTrackdir(trackdir)) {
cost += YAPF_TILE_LENGTH;
switch (GetTileType(tile)) {
case MP_ROAD:
/* Increase the cost for level crossings */
if (IsLevelCrossing(tile))
cost += Yapf().PfGetSettings().rail_crossing_penalty;
break;
default:
break;
}
} else {
// non-diagonal trackdir
cost = YAPF_TILE_CORNER_LENGTH;
}
return cost;
}
/** Check for a reserved station platform. */
FORCEINLINE bool IsAnyStationTileReserved(TileIndex tile, Trackdir trackdir, int skipped)
{
TileIndexDiff diff = TileOffsByDiagDir(TrackdirToExitdir(ReverseTrackdir(trackdir)));
for (; skipped >= 0; skipped--, tile += diff) {
if (GetRailwayStationReservation(tile)) return true;
}
return false;
}
/** The cost for reserved tiles, including skipped ones. */
FORCEINLINE int ReservationCost(Node& n, TileIndex tile, Trackdir trackdir, int skipped)
{
if (n.m_num_signals_passed >= m_sig_look_ahead_costs.Size() / 2) return 0;
if (IsRailwayStationTile(tile) && IsAnyStationTileReserved(tile, trackdir, skipped)) {
return Yapf().PfGetSettings().rail_pbs_station_penalty * (skipped + 1);
} else if (TrackOverlapsTracks(GetReservedTrackbits(tile), TrackdirToTrack(trackdir))) {
int cost = Yapf().PfGetSettings().rail_pbs_cross_penalty;
if (!IsDiagonalTrackdir(trackdir)) cost = (cost * YAPF_TILE_CORNER_LENGTH) / YAPF_TILE_LENGTH;
return cost * (skipped + 1);
}
return 0;
}
int SignalCost(Node& n, TileIndex tile, Trackdir trackdir)
{
int cost = 0;
// if there is one-way signal in the opposite direction, then it is not our way
CPerfStart perf_cost(Yapf().m_perf_other_cost);
if (IsTileType(tile, MP_RAILWAY)) {
bool has_signal_against = HasSignalOnTrackdir(tile, ReverseTrackdir(trackdir));
bool has_signal_along = HasSignalOnTrackdir(tile, trackdir);
if (has_signal_against && !has_signal_along && IsOnewaySignal(tile, TrackdirToTrack(trackdir))) {
// one-way signal in opposite direction
n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
} else {
if (has_signal_along) {
SignalState sig_state = GetSignalStateByTrackdir(tile, trackdir);
// cache the look-ahead polynomial constant only if we didn't pass more signals than the look-ahead limit is
int look_ahead_cost = (n.m_num_signals_passed < m_sig_look_ahead_costs.Size()) ? m_sig_look_ahead_costs.Data()[n.m_num_signals_passed] : 0;
if (sig_state != SIGNAL_STATE_RED) {
// green signal
n.flags_u.flags_s.m_last_signal_was_red = false;
// negative look-ahead red-signal penalties would cause problems later, so use them as positive penalties for green signal
if (look_ahead_cost < 0) {
// add its negation to the cost
cost -= look_ahead_cost;
}
} else {
SignalType sig_type = GetSignalType(tile, TrackdirToTrack(trackdir));
// we have a red signal in our direction
// was it first signal which is two-way?
if (!IsPbsSignal(sig_type) && Yapf().TreatFirstRedTwoWaySignalAsEOL() && n.flags_u.flags_s.m_choice_seen && has_signal_against && n.m_num_signals_passed == 0) {
// yes, the first signal is two-way red signal => DEAD END
n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
Yapf().m_stopped_on_first_two_way_signal = true;
return -1;
}
n.m_last_red_signal_type = sig_type;
n.flags_u.flags_s.m_last_signal_was_red = true;
// look-ahead signal penalty
if (!IsPbsSignal(sig_type) && look_ahead_cost > 0) {
// add the look ahead penalty only if it is positive
cost += look_ahead_cost;
}
// special signal penalties
if (n.m_num_signals_passed == 0) {
switch (sig_type) {
case SIGTYPE_COMBO:
case SIGTYPE_EXIT: cost += Yapf().PfGetSettings().rail_firstred_exit_penalty; break; // first signal is red pre-signal-exit
case SIGTYPE_NORMAL:
case SIGTYPE_ENTRY: cost += Yapf().PfGetSettings().rail_firstred_penalty; break;
default: break;
};
}
}
n.m_num_signals_passed++;
n.m_segment->m_last_signal_tile = tile;
n.m_segment->m_last_signal_td = trackdir;
}
if (has_signal_against && IsPbsSignal(GetSignalType(tile, TrackdirToTrack(trackdir)))) {
cost += n.m_num_signals_passed < Yapf().PfGetSettings().rail_look_ahead_max_signals ? Yapf().PfGetSettings().rail_pbs_signal_back_penalty : 0;
}
}
}
return cost;
}
FORCEINLINE int PlatformLengthPenalty(int platform_length)
{
int cost = 0;
const Vehicle *v = Yapf().GetVehicle();
assert(v != NULL);
assert(v->type == VEH_TRAIN);
assert(v->u.rail.cached_total_length != 0);
int needed_platform_length = (v->u.rail.cached_total_length + TILE_SIZE - 1) / TILE_SIZE;
if (platform_length > needed_platform_length) {
// apply penalty for longer platform than needed
cost += Yapf().PfGetSettings().rail_longer_platform_penalty;
} else if (needed_platform_length > platform_length) {
// apply penalty for shorter platform than needed
cost += Yapf().PfGetSettings().rail_shorter_platform_penalty;
}
return cost;
}
public:
FORCEINLINE void SetMaxCost(int max_cost) {m_max_cost = max_cost;}
/** Called by YAPF to calculate the cost from the origin to the given node.
* Calculates only the cost of given node, adds it to the parent node cost
* and stores the result into Node::m_cost member */
FORCEINLINE bool PfCalcCost(Node &n, const TrackFollower *tf)
{
assert(!n.flags_u.flags_s.m_targed_seen);
assert(tf->m_new_tile == n.m_key.m_tile);
assert((TrackdirToTrackdirBits(n.m_key.m_td) & tf->m_new_td_bits) != TRACKDIR_BIT_NONE);
CPerfStart perf_cost(Yapf().m_perf_cost);
/* Does the node have some parent node? */
bool has_parent = (n.m_parent != NULL);
/* Do we already have a cached segment? */
CachedData &segment = *n.m_segment;
bool is_cached_segment = (segment.m_cost >= 0);
int parent_cost = has_parent ? n.m_parent->m_cost : 0;
/* Each node cost contains 2 or 3 main components:
* 1. Transition cost - cost of the move from previous node (tile):
* - curve cost (or zero for straight move)
* 2. Tile cost:
* - base tile cost
* - YAPF_TILE_LENGTH for diagonal tiles
* - YAPF_TILE_CORNER_LENGTH for non-diagonal tiles
* - tile penalties
* - tile slope penalty (upward slopes)
* - red signal penalty
* - level crossing penalty
* - speed-limit penalty (bridges)
* - station platform penalty
* - penalty for reversing in the depot
* - etc.
* 3. Extra cost (applies to the last node only)
* - last red signal penalty
* - penalty for too long or too short platform on the destination station
*/
int transition_cost = 0;
int extra_cost = 0;
/* Segment: one or more tiles connected by contiguous tracks of the same type.
* Each segment cost includes 'Tile cost' for all its tiles (including the first
* and last), and the 'Transition cost' between its tiles. The first transition
* cost of segment entry (move from the 'parent' node) is not included!
*/
int segment_entry_cost = 0;
int segment_cost = 0;
const Vehicle *v = Yapf().GetVehicle();
// start at n.m_key.m_tile / n.m_key.m_td and walk to the end of segment
TILE cur(n.m_key.m_tile, n.m_key.m_td);
// the previous tile will be needed for transition cost calculations
TILE prev = !has_parent ? TILE() : TILE(n.m_parent->GetLastTile(), n.m_parent->GetLastTrackdir());
EndSegmentReasonBits end_segment_reason = ESRB_NONE;
TrackFollower tf_local(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
if (!has_parent) {
/* We will jump to the middle of the cost calculator assuming that segment cache is not used. */
assert(!is_cached_segment);
/* Skip the first transition cost calculation. */
goto no_entry_cost;
}
for (;;) {
/* Transition cost (cost of the move from previous tile) */
transition_cost = Yapf().CurveCost(prev.td, cur.td);
transition_cost += Yapf().SwitchCost(prev.tile, cur.tile, TrackdirToExitdir(prev.td));
/* First transition cost counts against segment entry cost, other transitions
* inside segment will come to segment cost (and will be cached) */
if (segment_cost == 0) {
/* We just entered the loop. First transition cost goes to segment entry cost)*/
segment_entry_cost = transition_cost;
transition_cost = 0;
/* It is the right time now to look if we can reuse the cached segment cost. */
if (is_cached_segment) {
/* Yes, we already know the segment cost. */
segment_cost = segment.m_cost;
/* We know also the reason why the segment ends. */
end_segment_reason = segment.m_end_segment_reason;
/* We will need also some information about the last signal (if it was red). */
if (segment.m_last_signal_tile != INVALID_TILE) {
assert(HasSignalOnTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td));
SignalState sig_state = GetSignalStateByTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td);
bool is_red = (sig_state == SIGNAL_STATE_RED);
n.flags_u.flags_s.m_last_signal_was_red = is_red;
if (is_red) {
n.m_last_red_signal_type = GetSignalType(segment.m_last_signal_tile, TrackdirToTrack(segment.m_last_signal_td));
}
}
/* No further calculation needed. */
cur = TILE(n.GetLastTile(), n.GetLastTrackdir());
break;
}
} else {
/* Other than first transition cost count as the regular segment cost. */
segment_cost += transition_cost;
}
no_entry_cost: // jump here at the beginning if the node has no parent (it is the first node)
/* All other tile costs will be calculated here. */
segment_cost += Yapf().OneTileCost(cur.tile, cur.td);
/* If we skipped some tunnel/bridge/station tiles, add their base cost */
segment_cost += YAPF_TILE_LENGTH * tf->m_tiles_skipped;
/* Slope cost. */
segment_cost += Yapf().SlopeCost(cur.tile, cur.td);
/* Reserved tiles. */
segment_cost += Yapf().ReservationCost(n, cur.tile, cur.td, tf->m_tiles_skipped);
/* Signal cost (routine can modify segment data). */
segment_cost += Yapf().SignalCost(n, cur.tile, cur.td);
end_segment_reason = segment.m_end_segment_reason;
/* Tests for 'potential target' reasons to close the segment. */
if (cur.tile == prev.tile) {
/* Penalty for reversing in a depot. */
assert(IsRailDepot(cur.tile));
segment_cost += Yapf().PfGetSettings().rail_depot_reverse_penalty;
/* We will end in this pass (depot is possible target) */
end_segment_reason |= ESRB_DEPOT;
} else if (tf->m_is_station) {
/* Station penalties. */
uint platform_length = tf->m_tiles_skipped + 1;
/* We don't know yet if the station is our target or not. Act like
* if it is pass-through station (not our destination). */
segment_cost += Yapf().PfGetSettings().rail_station_penalty * platform_length;
/* We will end in this pass (station is possible target) */
end_segment_reason |= ESRB_STATION;
} else if (cur.tile_type == MP_RAILWAY && IsRailWaypoint(cur.tile)) {
/* Waypoint is also a good reason to finish. */
end_segment_reason |= ESRB_WAYPOINT;
} else if (TrackFollower::DoTrackMasking() && cur.tile_type == MP_RAILWAY) {
/* Searching for a safe tile? */
if (HasSignalOnTrackdir(cur.tile, cur.td) && !IsPbsSignal(GetSignalType(cur.tile, TrackdirToTrack(cur.td)))) {
end_segment_reason |= ESRB_SAFE_TILE;
}
}
/* Apply min/max speed penalties only when inside the look-ahead radius. Otherwise
* it would cause desync in MP. */
if (n.m_num_signals_passed < m_sig_look_ahead_costs.Size())
{
int min_speed = 0;
int max_speed = tf->GetSpeedLimit(&min_speed);
if (max_speed < v->max_speed)
extra_cost += YAPF_TILE_LENGTH * (v->max_speed - max_speed) * (4 + tf->m_tiles_skipped) / v->max_speed;
if (min_speed > v->max_speed)
extra_cost += YAPF_TILE_LENGTH * (min_speed - v->max_speed);
}
/* Finish if we already exceeded the maximum path cost (i.e. when
* searching for the nearest depot). */
if (m_max_cost > 0 && (parent_cost + segment_entry_cost + segment_cost) > m_max_cost) {
end_segment_reason |= ESRB_PATH_TOO_LONG;
}
/* Move to the next tile/trackdir. */
tf = &tf_local;
tf_local.Init(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
if (!tf_local.Follow(cur.tile, cur.td)) {
assert(tf_local.m_err != TrackFollower::EC_NONE);
/* Can't move to the next tile (EOL?). */
if (tf_local.m_err == TrackFollower::EC_RAIL_TYPE) {
end_segment_reason |= ESRB_RAIL_TYPE;
} else {
end_segment_reason |= ESRB_DEAD_END;
}
if (TrackFollower::DoTrackMasking() && !HasOnewaySignalBlockingTrackdir(cur.tile, cur.td)) {
end_segment_reason |= ESRB_SAFE_TILE;
}
break;
}
/* Check if the next tile is not a choice. */
if (KillFirstBit(tf_local.m_new_td_bits) != TRACKDIR_BIT_NONE) {
/* More than one segment will follow. Close this one. */
end_segment_reason |= ESRB_CHOICE_FOLLOWS;
break;
}
/* Gather the next tile/trackdir/tile_type/rail_type. */
TILE next(tf_local.m_new_tile, (Trackdir)FindFirstBit2x64(tf_local.m_new_td_bits));
if (TrackFollower::DoTrackMasking() && HasPbsSignalOnTrackdir(next.tile, next.td)) {
/* Possible safe tile. */
end_segment_reason |= ESRB_SAFE_TILE;
}
/* Check the next tile for the rail type. */
if (next.rail_type != cur.rail_type) {
/* Segment must consist from the same rail_type tiles. */
end_segment_reason |= ESRB_RAIL_TYPE;
break;
}
/* Avoid infinite looping. */
if (next.tile == n.m_key.m_tile && next.td == n.m_key.m_td) {
end_segment_reason |= ESRB_INFINITE_LOOP;
break;
}
if (segment_cost > s_max_segment_cost) {
/* Potentially in the infinite loop (or only very long segment?). We should
* not force it to finish prematurely unless we are on a regular tile. */
if (IsTileType(tf->m_new_tile, MP_RAILWAY)) {
end_segment_reason |= ESRB_SEGMENT_TOO_LONG;
break;
}
}
/* Any other reason bit set? */
if (end_segment_reason != ESRB_NONE) {
break;
}
/* For the next loop set new prev and cur tile info. */
prev = cur;
cur = next;
} // for (;;)
bool target_seen = false;
if ((end_segment_reason & ESRB_POSSIBLE_TARGET) != ESRB_NONE) {
/* Depot, station or waypoint. */
if (Yapf().PfDetectDestination(cur.tile, cur.td)) {
/* Destination found. */
target_seen = true;
}
}
/* Update the segment if needed. */
if (!is_cached_segment) {
/* Write back the segment information so it can be reused the next time. */
segment.m_cost = segment_cost;
segment.m_end_segment_reason = end_segment_reason & ESRB_CACHED_MASK;
/* Save end of segment back to the node. */
n.SetLastTileTrackdir(cur.tile, cur.td);
}
/* Do we have an excuse why not to continue pathfinding in this direction? */
if (!target_seen && (end_segment_reason & ESRB_ABORT_PF_MASK) != ESRB_NONE) {
/* Reason to not continue. Stop this PF branch. */
return false;
}
/* Special costs for the case we have reached our target. */
if (target_seen) {
n.flags_u.flags_s.m_targed_seen = true;
/* Last-red and last-red-exit penalties. */
if (n.flags_u.flags_s.m_last_signal_was_red) {
if (n.m_last_red_signal_type == SIGTYPE_EXIT) {
// last signal was red pre-signal-exit
extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;
} else {
// last signal was red, but not exit
extra_cost += Yapf().PfGetSettings().rail_lastred_penalty;
}
}
/* Station platform-length penalty. */
if ((end_segment_reason & ESRB_STATION) != ESRB_NONE) {
Station *st = GetStationByTile(n.GetLastTile());
assert(st != NULL);
uint platform_length = st->GetPlatformLength(n.GetLastTile(), ReverseDiagDir(TrackdirToExitdir(n.GetLastTrackdir())));
/* Reduce the extra cost caused by passing-station penalty (each station receives it in the segment cost). */
extra_cost -= Yapf().PfGetSettings().rail_station_penalty * platform_length;
/* Add penalty for the inappropriate platform length. */
extra_cost += PlatformLengthPenalty(platform_length);
}
}
// total node cost
n.m_cost = parent_cost + segment_entry_cost + segment_cost + extra_cost;
return true;
}
FORCEINLINE bool CanUseGlobalCache(Node& n) const
{
return !m_disable_cache
&& (n.m_parent != NULL)
&& (n.m_parent->m_num_signals_passed >= m_sig_look_ahead_costs.Size());
}
FORCEINLINE void ConnectNodeToCachedData(Node& n, CachedData& ci)
{
n.m_segment = &ci;
if (n.m_segment->m_cost < 0) {
n.m_segment->m_last_tile = n.m_key.m_tile;
n.m_segment->m_last_td = n.m_key.m_td;
}
}
void DisableCache(bool disable)
{
m_disable_cache = disable;
}
};
#endif /* YAPF_COSTRAIL_HPP */
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