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Location: cpp/openttd-patchpack/source/src/npf.cpp - annotation
r6353:98010ef327e3
32.6 KiB
text/x-c
(svn r9392) -Update: WebTranslator2 update to 2007-03-21 19:54:29
brazilian_portuguese - 2 changed by fukumori (2)
danish - 11 fixed, 2 changed by ThomasA (13)
esperanto - 8 fixed by LaPingvino (8)
estonian - 28 fixed by vermon (27), t2t2 (1)
finnish - 19 fixed, 66 changed by pallokala (9), habazi (76)
french - 9 changed by Skiper (9)
italian - 1 fixed, 49 changed by sidew (50)
traditional_chinese - 2 fixed by thomasau (2)
ukrainian - 9 changed by mad (9)
brazilian_portuguese - 2 changed by fukumori (2)
danish - 11 fixed, 2 changed by ThomasA (13)
esperanto - 8 fixed by LaPingvino (8)
estonian - 28 fixed by vermon (27), t2t2 (1)
finnish - 19 fixed, 66 changed by pallokala (9), habazi (76)
french - 9 changed by Skiper (9)
italian - 1 fixed, 49 changed by sidew (50)
traditional_chinese - 2 fixed by thomasau (2)
ukrainian - 9 changed by mad (9)
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/** @file npf.cpp */
#include "stdafx.h"
#include "openttd.h"
#include "bridge_map.h"
#include "debug.h"
#include "functions.h"
#include "npf.h"
#include "aystar.h"
#include "macros.h"
#include "pathfind.h"
#include "station.h"
#include "station_map.h"
#include "tile.h"
#include "depot.h"
#include "tunnel_map.h"
#include "network/network.h"
#include "water_map.h"
static AyStar _npf_aystar;
/* The cost of each trackdir. A diagonal piece is the full NPF_TILE_LENGTH,
* the shorter piece is sqrt(2)/2*NPF_TILE_LENGTH =~ 0.7071
*/
#define NPF_STRAIGHT_LENGTH (uint)(NPF_TILE_LENGTH * STRAIGHT_TRACK_LENGTH)
static const uint _trackdir_length[TRACKDIR_END] = {
NPF_TILE_LENGTH, NPF_TILE_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH,
0, 0,
NPF_TILE_LENGTH, NPF_TILE_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH, NPF_STRAIGHT_LENGTH
};
/**
* Calculates the minimum distance traveled to get from t0 to t1 when only
* using tracks (ie, only making 45 degree turns). Returns the distance in the
* NPF scale, ie the number of full tiles multiplied by NPF_TILE_LENGTH to
* prevent rounding.
*/
static uint NPFDistanceTrack(TileIndex t0, TileIndex t1)
{
const uint dx = delta(TileX(t0), TileX(t1));
const uint dy = delta(TileY(t0), TileY(t1));
const uint straightTracks = 2 * min(dx, dy); /* The number of straight (not full length) tracks */
/* OPTIMISATION:
* Original: diagTracks = max(dx, dy) - min(dx,dy);
* Proof:
* (dx+dy) - straightTracks == (min + max) - straightTracks = min + max - 2 * min = max - min */
const uint diagTracks = dx + dy - straightTracks; /* The number of diagonal (full tile length) tracks. */
/* Don't factor out NPF_TILE_LENGTH below, this will round values and lose
* precision */
return diagTracks * NPF_TILE_LENGTH + straightTracks * NPF_TILE_LENGTH * STRAIGHT_TRACK_LENGTH;
}
#if 0
static uint NTPHash(uint key1, uint key2)
{
/* This function uses the old hash, which is fixed on 10 bits (1024 buckets) */
return PATHFIND_HASH_TILE(key1);
}
#endif
/**
* Calculates a hash value for use in the NPF.
* @param key1 The TileIndex of the tile to hash
* @param key2 The Trackdir of the track on the tile.
*
* @todo Think of a better hash.
*/
static uint NPFHash(uint key1, uint key2)
{
/* TODO: think of a better hash? */
uint part1 = TileX(key1) & NPF_HASH_HALFMASK;
uint part2 = TileY(key1) & NPF_HASH_HALFMASK;
assert(IsValidTrackdir((Trackdir)key2));
assert(IsValidTile(key1));
return ((part1 << NPF_HASH_HALFBITS | part2) + (NPF_HASH_SIZE * key2 / TRACKDIR_END)) % NPF_HASH_SIZE;
}
static int32 NPFCalcZero(AyStar* as, AyStarNode* current, OpenListNode* parent)
{
return 0;
}
/* Calcs the tile of given station that is closest to a given tile
* for this we assume the station is a rectangle,
* as defined by its top tile (st->train_tile) and its width/height (st->trainst_w, st->trainst_h)
*/
static TileIndex CalcClosestStationTile(StationID station, TileIndex tile)
{
const Station* st = GetStation(station);
uint minx = TileX(st->train_tile); // topmost corner of station
uint miny = TileY(st->train_tile);
uint maxx = minx + st->trainst_w - 1; // lowermost corner of station
uint maxy = miny + st->trainst_h - 1;
uint x;
uint y;
/* we are going the aim for the x coordinate of the closest corner
* but if we are between those coordinates, we will aim for our own x coordinate */
x = clamp(TileX(tile), minx, maxx);
/* same for y coordinate, see above comment */
y = clamp(TileY(tile), miny, maxy);
/* return the tile of our target coordinates */
return TileXY(x, y);
}
/* Calcs the heuristic to the target station or tile. For train stations, it
* takes into account the direction of approach.
*/
static int32 NPFCalcStationOrTileHeuristic(AyStar* as, AyStarNode* current, OpenListNode* parent)
{
NPFFindStationOrTileData* fstd = (NPFFindStationOrTileData*)as->user_target;
NPFFoundTargetData* ftd = (NPFFoundTargetData*)as->user_path;
TileIndex from = current->tile;
TileIndex to = fstd->dest_coords;
uint dist;
/* for train-stations, we are going to aim for the closest station tile */
if (as->user_data[NPF_TYPE] == TRANSPORT_RAIL && fstd->station_index != INVALID_STATION)
to = CalcClosestStationTile(fstd->station_index, from);
if (as->user_data[NPF_TYPE] == TRANSPORT_ROAD) {
/* Since roads only have diagonal pieces, we use manhattan distance here */
dist = DistanceManhattan(from, to) * NPF_TILE_LENGTH;
} else {
/* Ships and trains can also go diagonal, so the minimum distance is shorter */
dist = NPFDistanceTrack(from, to);
}
DEBUG(npf, 4, "Calculating H for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), dist);
if (dist < ftd->best_bird_dist) {
ftd->best_bird_dist = dist;
ftd->best_trackdir = (Trackdir)current->user_data[NPF_TRACKDIR_CHOICE];
}
return dist;
}
/* Fills AyStarNode.user_data[NPF_TRACKDIRCHOICE] with the chosen direction to
* get here, either getting it from the current choice or from the parent's
* choice */
static void NPFFillTrackdirChoice(AyStarNode* current, OpenListNode* parent)
{
if (parent->path.parent == NULL) {
Trackdir trackdir = (Trackdir)current->direction;
/* This is a first order decision, so we'd better save the
* direction we chose */
current->user_data[NPF_TRACKDIR_CHOICE] = trackdir;
DEBUG(npf, 6, "Saving trackdir: 0x%X", trackdir);
} else {
/* We've already made the decision, so just save our parent's decision */
current->user_data[NPF_TRACKDIR_CHOICE] = parent->path.node.user_data[NPF_TRACKDIR_CHOICE];
}
}
/* Will return the cost of the tunnel. If it is an entry, it will return the
* cost of that tile. If the tile is an exit, it will return the tunnel length
* including the exit tile. Requires that this is a Tunnel tile */
static uint NPFTunnelCost(AyStarNode* current)
{
DiagDirection exitdir = TrackdirToExitdir((Trackdir)current->direction);
TileIndex tile = current->tile;
if (GetTunnelDirection(tile) == ReverseDiagDir(exitdir)) {
/* We just popped out if this tunnel, since were
* facing the tunnel exit */
FindLengthOfTunnelResult flotr;
flotr = FindLengthOfTunnel(tile, ReverseDiagDir(exitdir));
return flotr.length * NPF_TILE_LENGTH;
/* @todo: Penalty for tunnels? */
} else {
/* We are entering the tunnel, the enter tile is just a
* straight track */
return NPF_TILE_LENGTH;
}
}
static inline uint NPFBridgeCost(AyStarNode *current)
{
return NPF_TILE_LENGTH * GetBridgeLength(current->tile, GetOtherBridgeEnd(current->tile));
}
static uint NPFSlopeCost(AyStarNode* current)
{
TileIndex next = current->tile + TileOffsByDiagDir(TrackdirToExitdir((Trackdir)current->direction));
int x,y;
int8 z1,z2;
x = TileX(current->tile) * TILE_SIZE;
y = TileY(current->tile) * TILE_SIZE;
/* get the height of the center of the current tile */
z1 = GetSlopeZ(x + TILE_SIZE / 2, y + TILE_SIZE / 2);
x = TileX(next) * TILE_SIZE;
y = TileY(next) * TILE_SIZE;
/* get the height of the center of the next tile */
z2 = GetSlopeZ(x + TILE_SIZE / 2, y + TILE_SIZE / 2);
if (z2 - z1 > 1) {
/* Slope up */
return _patches.npf_rail_slope_penalty;
}
return 0;
/* Should we give a bonus for slope down? Probably not, we
* could just substract that bonus from the penalty, because
* there is only one level of steepness... */
}
/**
* Mark tiles by mowing the grass when npf debug level >= 1.
* Will not work for multiplayer games, since it can (will) cause desyncs.
*/
static void NPFMarkTile(TileIndex tile)
{
#ifndef NO_DEBUG_MESSAGES
if (_debug_npf_level < 1 || _networking) return;
switch (GetTileType(tile)) {
case MP_RAILWAY:
/* DEBUG: mark visited tiles by mowing the grass under them ;-) */
if (!IsTileDepotType(tile, TRANSPORT_RAIL)) {
SetRailGroundType(tile, RAIL_GROUND_BARREN);
MarkTileDirtyByTile(tile);
}
break;
case MP_STREET:
if (!IsTileDepotType(tile, TRANSPORT_ROAD)) {
SetRoadside(tile, ROADSIDE_BARREN);
MarkTileDirtyByTile(tile);
}
break;
default:
break;
}
#endif
}
static int32 NPFWaterPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent)
{
/* TileIndex tile = current->tile; */
int32 cost = 0;
Trackdir trackdir = (Trackdir)current->direction;
cost = _trackdir_length[trackdir]; // Should be different for diagonal tracks
if (IsBuoyTile(current->tile) && IsDiagonalTrackdir(trackdir))
cost += _patches.npf_buoy_penalty; // A small penalty for going over buoys
if (current->direction != NextTrackdir((Trackdir)parent->path.node.direction))
cost += _patches.npf_water_curve_penalty;
/* @todo More penalties? */
return cost;
}
/* Determine the cost of this node, for road tracks */
static int32 NPFRoadPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent)
{
TileIndex tile = current->tile;
int32 cost = 0;
/* Determine base length */
switch (GetTileType(tile)) {
case MP_TUNNELBRIDGE:
cost = IsTunnel(tile) ? NPFTunnelCost(current) : NPFBridgeCost(current);
break;
case MP_STREET:
cost = NPF_TILE_LENGTH;
/* Increase the cost for level crossings */
if (IsLevelCrossing(tile)) cost += _patches.npf_crossing_penalty;
break;
case MP_STATION:
cost = NPF_TILE_LENGTH;
/* Increase the cost for drive-through road stops */
if (IsDriveThroughStopTile(tile)) cost += _patches.npf_road_drive_through_penalty;
break;
default:
break;
}
/* Determine extra costs */
/* Check for slope */
cost += NPFSlopeCost(current);
/* Check for turns. Road vehicles only really drive diagonal, turns are
* represented by non-diagonal tracks */
if (!IsDiagonalTrackdir((Trackdir)current->direction))
cost += _patches.npf_road_curve_penalty;
NPFMarkTile(tile);
DEBUG(npf, 4, "Calculating G for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), cost);
return cost;
}
/* Determine the cost of this node, for railway tracks */
static int32 NPFRailPathCost(AyStar* as, AyStarNode* current, OpenListNode* parent)
{
TileIndex tile = current->tile;
Trackdir trackdir = (Trackdir)current->direction;
int32 cost = 0;
/* HACK: We create a OpenListNode manually, so we can call EndNodeCheck */
OpenListNode new_node;
/* Determine base length */
switch (GetTileType(tile)) {
case MP_TUNNELBRIDGE:
cost = IsTunnel(tile) ? NPFTunnelCost(current) : NPFBridgeCost(current);
break;
case MP_RAILWAY:
cost = _trackdir_length[trackdir]; /* Should be different for diagonal tracks */
break;
case MP_STREET: /* Railway crossing */
cost = NPF_TILE_LENGTH;
break;
case MP_STATION:
/* We give a station tile a penalty. Logically we would only want to give
* station tiles that are not our destination this penalty. This would
* discourage trains to drive through busy stations. But, we can just
* give any station tile a penalty, because every possible route will get
* this penalty exactly once, on its end tile (if it's a station) and it
* will therefore not make a difference. */
cost = NPF_TILE_LENGTH + _patches.npf_rail_station_penalty;
break;
default:
break;
}
/* Determine extra costs */
/* Check for signals */
if (IsTileType(tile, MP_RAILWAY) && HasSignalOnTrackdir(tile, trackdir)) {
/* Ordinary track with signals */
if (GetSignalStateByTrackdir(tile, trackdir) == SIGNAL_STATE_RED) {
/* Signal facing us is red */
if (!NPFGetFlag(current, NPF_FLAG_SEEN_SIGNAL)) {
/* Penalize the first signal we
* encounter, if it is red */
/* Is this a presignal exit or combo? */
SignalType sigtype = GetSignalType(tile);
if (sigtype == SIGTYPE_EXIT || sigtype == SIGTYPE_COMBO) {
/* Penalise exit and combo signals differently (heavier) */
cost += _patches.npf_rail_firstred_exit_penalty;
} else {
cost += _patches.npf_rail_firstred_penalty;
}
}
/* Record the state of this signal */
NPFSetFlag(current, NPF_FLAG_LAST_SIGNAL_RED, true);
} else {
/* Record the state of this signal */
NPFSetFlag(current, NPF_FLAG_LAST_SIGNAL_RED, false);
}
NPFSetFlag(current, NPF_FLAG_SEEN_SIGNAL, true);
}
/* Penalise the tile if it is a target tile and the last signal was
* red */
/* HACK: We create a new_node here so we can call EndNodeCheck. Ugly as hell
* of course... */
new_node.path.node = *current;
if (as->EndNodeCheck(as, &new_node) == AYSTAR_FOUND_END_NODE && NPFGetFlag(current, NPF_FLAG_LAST_SIGNAL_RED))
cost += _patches.npf_rail_lastred_penalty;
/* Check for slope */
cost += NPFSlopeCost(current);
/* Check for turns */
if (current->direction != NextTrackdir((Trackdir)parent->path.node.direction))
cost += _patches.npf_rail_curve_penalty;
/*TODO, with realistic acceleration, also the amount of straight track between
* curves should be taken into account, as this affects the speed limit. */
/* Check for reverse in depot */
if (IsTileDepotType(tile, TRANSPORT_RAIL) && as->EndNodeCheck(as, &new_node) != AYSTAR_FOUND_END_NODE) {
/* Penalise any depot tile that is not the last tile in the path. This
* _should_ penalise every occurence of reversing in a depot (and only
* that) */
cost += _patches.npf_rail_depot_reverse_penalty;
}
/* Check for occupied track */
//TODO
NPFMarkTile(tile);
DEBUG(npf, 4, "Calculating G for: (%d, %d). Result: %d", TileX(current->tile), TileY(current->tile), cost);
return cost;
}
/* Will find any depot */
static int32 NPFFindDepot(AyStar* as, OpenListNode *current)
{
/* It's not worth caching the result with NPF_FLAG_IS_TARGET here as below,
* since checking the cache not that much faster than the actual check */
return IsTileDepotType(current->path.node.tile, (TransportType)as->user_data[NPF_TYPE]) ?
AYSTAR_FOUND_END_NODE : AYSTAR_DONE;
}
/* Will find a station identified using the NPFFindStationOrTileData */
static int32 NPFFindStationOrTile(AyStar* as, OpenListNode *current)
{
NPFFindStationOrTileData* fstd = (NPFFindStationOrTileData*)as->user_target;
AyStarNode *node = ¤t->path.node;
TileIndex tile = node->tile;
/* If GetNeighbours said we could get here, we assume the station type
* is correct */
if (
(fstd->station_index == INVALID_STATION && tile == fstd->dest_coords) || /* We've found the tile, or */
(IsTileType(tile, MP_STATION) && GetStationIndex(tile) == fstd->station_index) /* the station */
) {
return AYSTAR_FOUND_END_NODE;
} else {
return AYSTAR_DONE;
}
}
/* To be called when current contains the (shortest route to) the target node.
* Will fill the contents of the NPFFoundTargetData using
* AyStarNode[NPF_TRACKDIR_CHOICE].
*/
static void NPFSaveTargetData(AyStar* as, OpenListNode* current)
{
NPFFoundTargetData* ftd = (NPFFoundTargetData*)as->user_path;
ftd->best_trackdir = (Trackdir)current->path.node.user_data[NPF_TRACKDIR_CHOICE];
ftd->best_path_dist = current->g;
ftd->best_bird_dist = 0;
ftd->node = current->path.node;
}
/**
* Finds out if a given player's vehicles are allowed to enter a given tile.
* @param owner The owner of the vehicle.
* @param tile The tile that is about to be entered.
* @param enterdir The direction from which the vehicle wants to enter the tile.
* @return true if the vehicle can enter the tile.
* @todo This function should be used in other places than just NPF,
* maybe moved to another file too.
*/
static bool VehicleMayEnterTile(Owner owner, TileIndex tile, DiagDirection enterdir)
{
if (IsTileType(tile, MP_RAILWAY) || /* Rail tile (also rail depot) */
IsRailwayStationTile(tile) || /* Rail station tile */
IsTileDepotType(tile, TRANSPORT_ROAD) || /* Road depot tile */
IsStandardRoadStopTile(tile) || /* Road station tile (but not drive-through stops) */
IsTileDepotType(tile, TRANSPORT_WATER)) { /* Water depot tile */
return IsTileOwner(tile, owner); /* You need to own these tiles entirely to use them */
}
switch (GetTileType(tile)) {
case MP_STREET:
/* rail-road crossing : are we looking at the railway part? */
if (IsLevelCrossing(tile) &&
DiagDirToAxis(enterdir) != GetCrossingRoadAxis(tile)) {
return IsTileOwner(tile, owner); /* Railway needs owner check, while the street is public */
}
break;
case MP_TUNNELBRIDGE:
if ((IsTunnel(tile) && GetTunnelTransportType(tile) == TRANSPORT_RAIL) ||
(IsBridge(tile) && GetBridgeTransportType(tile) == TRANSPORT_RAIL)) {
return IsTileOwner(tile, owner);
}
break;
default:
break;
}
return true; // no need to check
}
/**
* Returns the direction the exit of the depot on the given tile is facing.
*/
static DiagDirection GetDepotDirection(TileIndex tile, TransportType type)
{
assert(IsTileDepotType(tile, type));
switch (type) {
case TRANSPORT_RAIL: return GetRailDepotDirection(tile);
case TRANSPORT_ROAD: return GetRoadDepotDirection(tile);
case TRANSPORT_WATER: return GetShipDepotDirection(tile);
default: return INVALID_DIAGDIR; /* Not reached */
}
}
/* Will just follow the results of GetTileTrackStatus concerning where we can
* go and where not. Uses AyStar.user_data[NPF_TYPE] as the transport type and
* an argument to GetTileTrackStatus. Will skip tunnels, meaning that the
* entry and exit are neighbours. Will fill
* AyStarNode.user_data[NPF_TRACKDIR_CHOICE] with an appropriate value, and
* copy AyStarNode.user_data[NPF_NODE_FLAGS] from the parent */
static void NPFFollowTrack(AyStar* aystar, OpenListNode* current)
{
Trackdir src_trackdir = (Trackdir)current->path.node.direction;
TileIndex src_tile = current->path.node.tile;
DiagDirection src_exitdir = TrackdirToExitdir(src_trackdir);
TileIndex dst_tile = INVALID_TILE;
int i;
uint32 ts;
TrackdirBits trackdirbits;
TransportType type = (TransportType)aystar->user_data[NPF_TYPE];
bool override_dst_check = false;
/* Initialize to 0, so we can jump out (return) somewhere an have no neighbours */
aystar->num_neighbours = 0;
DEBUG(npf, 4, "Expanding: (%d, %d, %d) [%d]", TileX(src_tile), TileY(src_tile), src_trackdir, src_tile);
/* Find dest tile */
if (IsTunnelTile(src_tile) && GetTunnelDirection(src_tile) == src_exitdir) {
/* This is a tunnel. We know this tunnel is our type,
* otherwise we wouldn't have got here. It is also facing us,
* so we should skip it's body */
dst_tile = GetOtherTunnelEnd(src_tile);
override_dst_check = true;
} else if (IsBridgeTile(src_tile) && GetBridgeRampDirection(src_tile) == src_exitdir) {
dst_tile = GetOtherBridgeEnd(src_tile);
override_dst_check = true;
} else if (type != TRANSPORT_WATER && (IsStandardRoadStopTile(src_tile) || IsTileDepotType(src_tile, type))) {
/* This is a road station (non drive-through) or a train or road depot. We can enter and exit
* those from one side only. Trackdirs don't support that (yet), so we'll
* do this here. */
DiagDirection exitdir;
/* Find out the exit direction first */
if (IsRoadStopTile(src_tile)) {
exitdir = GetRoadStopDir(src_tile);
} else { // Train or road depot
exitdir = GetDepotDirection(src_tile, type);
}
/* Let's see if were headed the right way into the depot */
if (src_trackdir == DiagdirToDiagTrackdir(ReverseDiagDir(exitdir))) {
/* We are headed inwards. We cannot go through the back of the depot.
* For rail, we can now reverse. Reversing for road vehicles is never
* useful, since you cannot take paths you couldn't take before
* reversing (as with rail). */
if (type == TRANSPORT_RAIL) {
/* We can only reverse here, so we'll not consider this direction, but
* jump ahead to the reverse direction. It would be nicer to return
* one neighbour here (the reverse trackdir of the one we are
* considering now) and then considering that one to return the tracks
* outside of the depot. But, because the code layout is cleaner this
* way, we will just pretend we are reversed already */
src_trackdir = ReverseTrackdir(src_trackdir);
dst_tile = AddTileIndexDiffCWrap(src_tile, TileIndexDiffCByDiagDir(exitdir));
} else {
dst_tile = INVALID_TILE; /* Road vehicle heading inwards: dead end */
}
} else {
dst_tile = AddTileIndexDiffCWrap(src_tile, TileIndexDiffCByDiagDir(exitdir));
}
} else {
/* This a normal tile, a bridge, a tunnel exit, etc. */
dst_tile = AddTileIndexDiffCWrap(src_tile, TileIndexDiffCByDiagDir(TrackdirToExitdir(src_trackdir)));
}
if (dst_tile == INVALID_TILE) {
/* We reached the border of the map */
/* TODO Nicer control flow for this */
return;
}
/* I can't enter a tunnel entry/exit tile from a tile above the tunnel. Note
* that I can enter the tunnel from a tile below the tunnel entrance. This
* solves the problem of vehicles wanting to drive off a tunnel entrance */
if (!override_dst_check) {
if (IsTileType(dst_tile, MP_TUNNELBRIDGE)) {
if (IsTunnel(dst_tile)) {
if (GetTunnelDirection(dst_tile) != src_exitdir) return;
} else {
if (GetBridgeRampDirection(dst_tile) != src_exitdir) return;
}
}
}
/* check correct rail type (mono, maglev, etc) */
if (type == TRANSPORT_RAIL) {
RailType dst_type = GetTileRailType(dst_tile);
if (!HASBIT(aystar->user_data[NPF_RAILTYPES], dst_type))
return;
}
/* Check the owner of the tile */
if (!VehicleMayEnterTile((Owner)aystar->user_data[NPF_OWNER], dst_tile, TrackdirToExitdir(src_trackdir))) {
return;
}
/* Determine available tracks */
if (type != TRANSPORT_WATER && (IsStandardRoadStopTile(dst_tile) || IsTileDepotType(dst_tile, type))){
/* Road stations and road and train depots return 0 on GTTS, so we have to do this by hand... */
DiagDirection exitdir;
if (IsRoadStopTile(dst_tile)) {
exitdir = GetRoadStopDir(dst_tile);
} else { // Road or train depot
exitdir = GetDepotDirection(dst_tile, type);
}
/* Find the trackdirs that are available for a depot or station with this
* orientation. They are only "inwards", since we are reaching this tile
* from some other tile. This prevents vehicles driving into depots from
* the back */
ts = TrackdirToTrackdirBits(DiagdirToDiagTrackdir(ReverseDiagDir(exitdir)));
} else {
ts = GetTileTrackStatus(dst_tile, type);
}
trackdirbits = (TrackdirBits)(ts & TRACKDIR_BIT_MASK); /* Filter out signal status and the unused bits */
DEBUG(npf, 4, "Next node: (%d, %d) [%d], possible trackdirs: 0x%X", TileX(dst_tile), TileY(dst_tile), dst_tile, trackdirbits);
/* Select only trackdirs we can reach from our current trackdir */
trackdirbits &= TrackdirReachesTrackdirs(src_trackdir);
if (_patches.forbid_90_deg && (type == TRANSPORT_RAIL || type == TRANSPORT_WATER)) /* Filter out trackdirs that would make 90 deg turns for trains */
trackdirbits &= ~TrackdirCrossesTrackdirs(src_trackdir);
DEBUG(npf, 6, "After filtering: (%d, %d), possible trackdirs: 0x%X", TileX(dst_tile), TileY(dst_tile), trackdirbits);
i = 0;
/* Enumerate possible track */
while (trackdirbits != 0) {
Trackdir dst_trackdir = RemoveFirstTrackdir(&trackdirbits);
DEBUG(npf, 5, "Expanded into trackdir: %d, remaining trackdirs: 0x%X", dst_trackdir, trackdirbits);
/* Check for oneway signal against us */
if (IsTileType(dst_tile, MP_RAILWAY) && GetRailTileType(dst_tile) == RAIL_TILE_SIGNALS) {
if (HasSignalOnTrackdir(dst_tile, ReverseTrackdir(dst_trackdir)) && !HasSignalOnTrackdir(dst_tile, dst_trackdir))
/* if one way signal not pointing towards us, stop going in this direction. */
break;
}
{
/* We've found ourselves a neighbour :-) */
AyStarNode* neighbour = &aystar->neighbours[i];
neighbour->tile = dst_tile;
neighbour->direction = dst_trackdir;
/* Save user data */
neighbour->user_data[NPF_NODE_FLAGS] = current->path.node.user_data[NPF_NODE_FLAGS];
NPFFillTrackdirChoice(neighbour, current);
}
i++;
}
aystar->num_neighbours = i;
}
/*
* Plan a route to the specified target (which is checked by target_proc),
* from start1 and if not NULL, from start2 as well. The type of transport we
* are checking is in type. reverse_penalty is applied to all routes that
* originate from the second start node.
* When we are looking for one specific target (optionally multiple tiles), we
* should use a good heuristic to perform aystar search. When we search for
* multiple targets that are spread around, we should perform a breadth first
* search by specifiying CalcZero as our heuristic.
*/
static NPFFoundTargetData NPFRouteInternal(AyStarNode* start1, AyStarNode* start2, NPFFindStationOrTileData* target, AyStar_EndNodeCheck target_proc, AyStar_CalculateH heuristic_proc, TransportType type, Owner owner, RailTypeMask railtypes, uint reverse_penalty)
{
int r;
NPFFoundTargetData result;
/* Initialize procs */
_npf_aystar.CalculateH = heuristic_proc;
_npf_aystar.EndNodeCheck = target_proc;
_npf_aystar.FoundEndNode = NPFSaveTargetData;
_npf_aystar.GetNeighbours = NPFFollowTrack;
switch (type) {
default: NOT_REACHED();
case TRANSPORT_RAIL: _npf_aystar.CalculateG = NPFRailPathCost; break;
case TRANSPORT_ROAD: _npf_aystar.CalculateG = NPFRoadPathCost; break;
case TRANSPORT_WATER: _npf_aystar.CalculateG = NPFWaterPathCost; break;
}
/* Initialize Start Node(s) */
start1->user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
start1->user_data[NPF_NODE_FLAGS] = 0;
_npf_aystar.addstart(&_npf_aystar, start1, 0);
if (start2) {
start2->user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
start2->user_data[NPF_NODE_FLAGS] = 0;
NPFSetFlag(start2, NPF_FLAG_REVERSE, true);
_npf_aystar.addstart(&_npf_aystar, start2, reverse_penalty);
}
/* Initialize result */
result.best_bird_dist = (uint)-1;
result.best_path_dist = (uint)-1;
result.best_trackdir = INVALID_TRACKDIR;
_npf_aystar.user_path = &result;
/* Initialize target */
_npf_aystar.user_target = target;
/* Initialize user_data */
_npf_aystar.user_data[NPF_TYPE] = type;
_npf_aystar.user_data[NPF_OWNER] = owner;
_npf_aystar.user_data[NPF_RAILTYPES] = railtypes;
/* GO! */
r = AyStarMain_Main(&_npf_aystar);
assert(r != AYSTAR_STILL_BUSY);
if (result.best_bird_dist != 0) {
if (target != NULL) {
DEBUG(npf, 1, "Could not find route to tile 0x%X from 0x%X.", target->dest_coords, start1->tile);
} else {
/* Assumption: target == NULL, so we are looking for a depot */
DEBUG(npf, 1, "Could not find route to a depot from tile 0x%X.", start1->tile);
}
}
return result;
}
NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailTypeMask railtypes)
{
AyStarNode start1;
AyStarNode start2;
start1.tile = tile1;
start2.tile = tile2;
/* We set this in case the target is also the start tile, we will just
* return a not found then */
start1.user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
start1.direction = trackdir1;
start2.direction = trackdir2;
start2.user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
return NPFRouteInternal(&start1, (IsValidTile(tile2) ? &start2 : NULL), target, NPFFindStationOrTile, NPFCalcStationOrTileHeuristic, type, owner, railtypes, 0);
}
NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, Trackdir trackdir, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailTypeMask railtypes)
{
return NPFRouteToStationOrTileTwoWay(tile, trackdir, INVALID_TILE, INVALID_TRACKDIR, target, type, owner, railtypes);
}
NPFFoundTargetData NPFRouteToDepotBreadthFirstTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, TransportType type, Owner owner, RailTypeMask railtypes, uint reverse_penalty)
{
AyStarNode start1;
AyStarNode start2;
start1.tile = tile1;
start2.tile = tile2;
/* We set this in case the target is also the start tile, we will just
* return a not found then */
start1.user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
start1.direction = trackdir1;
start2.direction = trackdir2;
start2.user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
/* perform a breadth first search. Target is NULL,
* since we are just looking for any depot...*/
return NPFRouteInternal(&start1, (IsValidTile(tile2) ? &start2 : NULL), NULL, NPFFindDepot, NPFCalcZero, type, owner, railtypes, reverse_penalty);
}
NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailTypeMask railtypes)
{
return NPFRouteToDepotBreadthFirstTwoWay(tile, trackdir, INVALID_TILE, INVALID_TRACKDIR, type, owner, railtypes, 0);
}
NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailTypeMask railtypes)
{
/* Okay, what we're gonna do. First, we look at all depots, calculate
* the manhatten distance to get to each depot. We then sort them by
* distance. We start by trying to plan a route to the closest, then
* the next closest, etc. We stop when the best route we have found so
* far, is shorter than the manhattan distance. This will obviously
* always find the closest depot. It will probably be most efficient
* for ships, since the heuristic will not be to far off then. I hope.
*/
Queue depots;
int r;
NPFFoundTargetData best_result = {(uint)-1, (uint)-1, INVALID_TRACKDIR, {INVALID_TILE, 0, {0, 0}}};
NPFFoundTargetData result;
NPFFindStationOrTileData target;
AyStarNode start;
Depot* current;
Depot *depot;
init_InsSort(&depots);
/* Okay, let's find all depots that we can use first */
FOR_ALL_DEPOTS(depot) {
/* Check if this is really a valid depot, it is of the needed type and
* owner */
if (IsTileDepotType(depot->xy, type) && IsTileOwner(depot->xy, owner))
/* If so, let's add it to the queue, sorted by distance */
depots.push(&depots, depot, DistanceManhattan(tile, depot->xy));
}
/* Now, let's initialise the aystar */
/* Initialize procs */
_npf_aystar.CalculateH = NPFCalcStationOrTileHeuristic;
_npf_aystar.EndNodeCheck = NPFFindStationOrTile;
_npf_aystar.FoundEndNode = NPFSaveTargetData;
_npf_aystar.GetNeighbours = NPFFollowTrack;
switch (type) {
default: NOT_REACHED();
case TRANSPORT_RAIL: _npf_aystar.CalculateG = NPFRailPathCost; break;
case TRANSPORT_ROAD: _npf_aystar.CalculateG = NPFRoadPathCost; break;
case TRANSPORT_WATER: _npf_aystar.CalculateG = NPFWaterPathCost; break;
}
/* Initialize target */
target.station_index = INVALID_STATION; /* We will initialize dest_coords inside the loop below */
_npf_aystar.user_target = ⌖
/* Initialize user_data */
_npf_aystar.user_data[NPF_TYPE] = type;
_npf_aystar.user_data[NPF_OWNER] = owner;
/* Initialize Start Node */
start.tile = tile;
start.direction = trackdir; /* We will initialize user_data inside the loop below */
/* Initialize Result */
_npf_aystar.user_path = &result;
best_result.best_path_dist = (uint)-1;
best_result.best_bird_dist = (uint)-1;
/* Just iterate the depots in order of increasing distance */
while ((current = (Depot*)depots.pop(&depots))) {
/* Check to see if we already have a path shorter than this
* depot's manhattan distance. HACK: We call DistanceManhattan
* again, we should probably modify the queue to give us that
* value... */
if ( DistanceManhattan(tile, current->xy * NPF_TILE_LENGTH) > best_result.best_path_dist)
break;
/* Initialize Start Node */
/* We set this in case the target is also the start tile, we will just
* return a not found then */
start.user_data[NPF_TRACKDIR_CHOICE] = INVALID_TRACKDIR;
start.user_data[NPF_NODE_FLAGS] = 0;
_npf_aystar.addstart(&_npf_aystar, &start, 0);
/* Initialize result */
result.best_bird_dist = (uint)-1;
result.best_path_dist = (uint)-1;
result.best_trackdir = INVALID_TRACKDIR;
/* Initialize target */
target.dest_coords = current->xy;
/* GO! */
r = AyStarMain_Main(&_npf_aystar);
assert(r != AYSTAR_STILL_BUSY);
/* This depot is closer */
if (result.best_path_dist < best_result.best_path_dist)
best_result = result;
}
if (result.best_bird_dist != 0) {
DEBUG(npf, 1, "Could not find route to any depot from tile 0x%X.", tile);
}
return best_result;
}
void InitializeNPF()
{
init_AyStar(&_npf_aystar, NPFHash, NPF_HASH_SIZE);
_npf_aystar.loops_per_tick = 0;
_npf_aystar.max_path_cost = 0;
//_npf_aystar.max_search_nodes = 0;
/* We will limit the number of nodes for now, until we have a better
* solution to really fix performance */
_npf_aystar.max_search_nodes = _patches.npf_max_search_nodes;
}
void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v)
{
/* Ships don't really reach their stations, but the tile in front. So don't
* save the station id for ships. For roadvehs we don't store it either,
* because multistop depends on vehicles actually reaching the exact
* dest_tile, not just any stop of that station.
* So only for train orders to stations we fill fstd->station_index, for all
* others only dest_coords */
if (v->current_order.type == OT_GOTO_STATION && v->type == VEH_TRAIN) {
fstd->station_index = v->current_order.dest;
/* Let's take the closest tile of the station as our target for trains */
fstd->dest_coords = CalcClosestStationTile(v->current_order.dest, v->tile);
} else {
fstd->dest_coords = v->dest_tile;
fstd->station_index = INVALID_STATION;
}
}
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