--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/rail_cmd.cpp Wed Jan 10 18:12:09 2007 +0000
@@ -0,0 +1,1985 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "bridge_map.h"
+#include "debug.h"
+#include "functions.h"
+#include "rail_map.h"
+#include "road_map.h"
+#include "table/sprites.h"
+#include "table/strings.h"
+#include "map.h"
+#include "tile.h"
+#include "town_map.h"
+#include "tunnel_map.h"
+#include "vehicle.h"
+#include "viewport.h"
+#include "command.h"
+#include "pathfind.h"
+#include "engine.h"
+#include "town.h"
+#include "sound.h"
+#include "station.h"
+#include "sprite.h"
+#include "depot.h"
+#include "waypoint.h"
+#include "window.h"
+#include "rail.h"
+#include "railtypes.h" // include table for railtypes
+#include "newgrf.h"
+#include "yapf/yapf.h"
+#include "newgrf_callbacks.h"
+#include "newgrf_station.h"
+#include "train.h"
+
+const byte _track_sloped_sprites[14] = {
+ 14, 15, 22, 13,
+ 0, 21, 17, 12,
+ 23, 0, 18, 20,
+ 19, 16
+};
+
+
+/* 4
+ * ---------
+ * |\ /|
+ * | \ 1/ |
+ * | \ / |
+ * | \ / |
+ * 16| \ |32
+ * | / \2 |
+ * | / \ |
+ * | / \ |
+ * |/ \|
+ * ---------
+ * 8
+ */
+
+
+
+/* MAP2 byte: abcd???? => Signal On? Same coding as map3lo
+ * MAP3LO byte: abcd???? => Signal Exists?
+ * a and b are for diagonals, upper and left,
+ * one for each direction. (ie a == NE->SW, b ==
+ * SW->NE, or v.v., I don't know. b and c are
+ * similar for lower and right.
+ * MAP2 byte: ????abcd => Type of ground.
+ * MAP3LO byte: ????abcd => Type of rail.
+ * MAP5: 00abcdef => rail
+ * 01abcdef => rail w/ signals
+ * 10uuuuuu => unused
+ * 11uuuudd => rail depot
+ */
+
+static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)
+{
+ TrackBits current; /* The current track layout */
+ TrackBits future; /* The track layout we want to build */
+ _error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;
+
+ if (!IsPlainRailTile(tile)) return false;
+
+ /* So, we have a tile with tracks on it (and possibly signals). Let's see
+ * what tracks first */
+ current = GetTrackBits(tile);
+ future = current | to_build;
+
+ /* Are we really building something new? */
+ if (current == future) {
+ /* Nothing new is being built */
+ _error_message = STR_1007_ALREADY_BUILT;
+ return false;
+ }
+
+ /* Let's see if we may build this */
+ if (flags & DC_NO_RAIL_OVERLAP || HasSignals(tile)) {
+ /* If we are not allowed to overlap (flag is on for ai players or we have
+ * signals on the tile), check that */
+ return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;
+ } else {
+ /* Normally, we may overlap and any combination is valid */
+ return true;
+ }
+}
+
+
+static const TrackBits _valid_tileh_slopes[][15] = {
+
+// set of normal ones
+{
+ TRACK_BIT_ALL,
+ TRACK_BIT_RIGHT,
+ TRACK_BIT_UPPER,
+ TRACK_BIT_X,
+
+ TRACK_BIT_LEFT,
+ 0,
+ TRACK_BIT_Y,
+ TRACK_BIT_LOWER,
+
+ TRACK_BIT_LOWER,
+ TRACK_BIT_Y,
+ 0,
+ TRACK_BIT_LEFT,
+
+ TRACK_BIT_X,
+ TRACK_BIT_UPPER,
+ TRACK_BIT_RIGHT,
+},
+
+// allowed rail for an evenly raised platform
+{
+ 0,
+ TRACK_BIT_LEFT,
+ TRACK_BIT_LOWER,
+ TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,
+
+ TRACK_BIT_RIGHT,
+ TRACK_BIT_ALL,
+ TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,
+ TRACK_BIT_ALL,
+
+ TRACK_BIT_UPPER,
+ TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,
+ TRACK_BIT_ALL,
+ TRACK_BIT_ALL,
+
+ TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,
+ TRACK_BIT_ALL,
+ TRACK_BIT_ALL
+}
+};
+
+uint GetRailFoundation(Slope tileh, TrackBits bits)
+{
+ uint i;
+
+ if (!IsSteepSlope(tileh)) {
+ if ((~_valid_tileh_slopes[0][tileh] & bits) == 0) return 0;
+ if ((~_valid_tileh_slopes[1][tileh] & bits) == 0) return tileh;
+ }
+
+ switch (bits) {
+ default: NOT_REACHED();
+ case TRACK_BIT_X: i = 0; break;
+ case TRACK_BIT_Y: i = 1; break;
+ case TRACK_BIT_LEFT: return 15 + 8 + (tileh == SLOPE_STEEP_W ? 4 : 0);
+ case TRACK_BIT_LOWER: return 15 + 8 + (tileh == SLOPE_STEEP_S ? 5 : 1);
+ case TRACK_BIT_RIGHT: return 15 + 8 + (tileh == SLOPE_STEEP_E ? 6 : 2);
+ case TRACK_BIT_UPPER: return 15 + 8 + (tileh == SLOPE_STEEP_N ? 7 : 3);
+ }
+ switch (tileh) {
+ case SLOPE_W:
+ case SLOPE_STEEP_W: i += 0; break;
+ case SLOPE_S:
+ case SLOPE_STEEP_S: i += 2; break;
+ case SLOPE_E:
+ case SLOPE_STEEP_E: i += 4; break;
+ case SLOPE_N:
+ case SLOPE_STEEP_N: i += 6; break;
+ default: return 0;
+ }
+ return i + 15;
+}
+
+
+static uint32 CheckRailSlope(Slope tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)
+{
+ if (IsSteepSlope(tileh)) {
+ if (existing == 0) {
+ TrackBits valid = TRACK_BIT_CROSS | (HASBIT(1 << SLOPE_STEEP_W | 1 << SLOPE_STEEP_E, tileh) ? TRACK_BIT_VERT : TRACK_BIT_HORZ);
+ if (valid & rail_bits) return _price.terraform;
+ }
+ } else {
+ rail_bits |= existing;
+
+ // don't allow building on the lower side of a coast
+ if (IsTileType(tile, MP_WATER) &&
+ ~_valid_tileh_slopes[1][tileh] & rail_bits) {
+ return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);
+ }
+
+ // no special foundation
+ if ((~_valid_tileh_slopes[0][tileh] & rail_bits) == 0)
+ return 0;
+
+ if ((~_valid_tileh_slopes[1][tileh] & rail_bits) == 0 || ( // whole tile is leveled up
+ (rail_bits == TRACK_BIT_X || rail_bits == TRACK_BIT_Y) &&
+ (tileh == SLOPE_W || tileh == SLOPE_S || tileh == SLOPE_E || tileh == SLOPE_N)
+ )) { // partly up
+ if (existing != 0) {
+ return 0;
+ } else if (!_patches.build_on_slopes || _is_old_ai_player) {
+ return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
+ } else {
+ return _price.terraform;
+ }
+ }
+ }
+ return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
+}
+
+/* Validate functions for rail building */
+static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}
+
+/** Build a single piece of rail
+ * @param tile tile to build on
+ * @param p1 railtype of being built piece (normal, mono, maglev)
+ * @param p2 rail track to build
+ */
+int32 CmdBuildSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ Slope tileh;
+ RailType railtype;
+ Track track;
+ TrackBits trackbit;
+ int32 cost = 0;
+ int32 ret;
+
+ if (!ValParamRailtype(p1) || !ValParamTrackOrientation(p2)) return CMD_ERROR;
+ railtype = (RailType)p1;
+ track = (Track)p2;
+
+ tileh = GetTileSlope(tile, NULL);
+ trackbit = TrackToTrackBits(track);
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ switch (GetTileType(tile)) {
+ case MP_RAILWAY:
+ if (!CheckTrackCombination(tile, trackbit, flags) ||
+ !EnsureNoVehicle(tile)) {
+ return CMD_ERROR;
+ }
+ if (!IsTileOwner(tile, _current_player) ||
+ !IsCompatibleRail(GetRailType(tile), railtype)) {
+ // Get detailed error message
+ return DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+ }
+
+ ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
+ if (CmdFailed(ret)) return ret;
+ cost += ret;
+
+ /* If the rail types don't match, try to convert only if engines of
+ * the present rail type are powered on the new rail type. */
+ if (GetRailType(tile) != railtype && HasPowerOnRail(GetRailType(tile), railtype)) {
+ ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);
+ if (CmdFailed(ret)) return ret;
+ cost += ret;
+ }
+
+ if (flags & DC_EXEC) {
+ SetRailGroundType(tile, RAIL_GROUND_BARREN);
+ SetTrackBits(tile, GetTrackBits(tile) | trackbit);
+ }
+ break;
+
+ case MP_STREET:
+#define M(x) (1 << (x))
+ /* Level crossings may only be built on these slopes */
+ if (!HASBIT(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {
+ return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);
+ }
+#undef M
+
+ if (!EnsureNoVehicle(tile)) return CMD_ERROR;
+
+ if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {
+ if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);
+
+ if ((track == TRACK_X && GetRoadBits(tile) == ROAD_Y) ||
+ (track == TRACK_Y && GetRoadBits(tile) == ROAD_X)) {
+ if (flags & DC_EXEC) {
+ MakeRoadCrossing(tile, GetTileOwner(tile), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, GetTownIndex(tile));
+ }
+ break;
+ }
+ }
+
+ if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {
+ return_cmd_error(STR_1007_ALREADY_BUILT);
+ }
+ /* FALLTHROUGH */
+
+ default:
+ ret = CheckRailSlope(tileh, trackbit, 0, tile);
+ if (CmdFailed(ret)) return ret;
+ cost += ret;
+
+ ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+ if (CmdFailed(ret)) return ret;
+ cost += ret;
+
+ if (flags & DC_EXEC) MakeRailNormal(tile, _current_player, trackbit, railtype);
+ break;
+ }
+
+ if (flags & DC_EXEC) {
+ MarkTileDirtyByTile(tile);
+ SetSignalsOnBothDir(tile, track);
+ YapfNotifyTrackLayoutChange(tile, track);
+ }
+
+ return cost + _price.build_rail;
+}
+
+/** Remove a single piece of track
+ * @param tile tile to remove track from
+ * @param p1 unused
+ * @param p2 rail orientation
+ */
+int32 CmdRemoveSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ Track track = (Track)p2;
+ TrackBits trackbit;
+ int32 cost = _price.remove_rail;
+ bool crossing = false;
+
+ if (!ValParamTrackOrientation(p2)) return CMD_ERROR;
+ trackbit = TrackToTrackBits(track);
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ switch (GetTileType(tile)) {
+ case MP_STREET: {
+ if (!IsLevelCrossing(tile) ||
+ GetCrossingRailBits(tile) != trackbit ||
+ (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
+ !EnsureNoVehicle(tile)) {
+ return CMD_ERROR;
+ }
+
+ if (flags & DC_EXEC) {
+ MakeRoadNormal(tile, GetCrossingRoadOwner(tile), GetCrossingRoadBits(tile), GetTownIndex(tile));
+ }
+ break;
+ }
+
+ case MP_RAILWAY: {
+ TrackBits present;
+
+ if (!IsPlainRailTile(tile) ||
+ (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
+ !EnsureNoVehicle(tile)) {
+ return CMD_ERROR;
+ }
+
+ present = GetTrackBits(tile);
+ if ((present & trackbit) == 0) return CMD_ERROR;
+ if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
+
+ /* Charge extra to remove signals on the track, if they are there */
+ if (HasSignalOnTrack(tile, track))
+ cost += DoCommand(tile, track, 0, flags, CMD_REMOVE_SIGNALS);
+
+ if (flags & DC_EXEC) {
+ present ^= trackbit;
+ if (present == 0) {
+ DoClearSquare(tile);
+ } else {
+ SetTrackBits(tile, present);
+ }
+ }
+ break;
+ }
+
+ default: return CMD_ERROR;
+ }
+
+ if (flags & DC_EXEC) {
+ MarkTileDirtyByTile(tile);
+ if (crossing) {
+ /* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we
+ * are removing one of these pieces, we'll need to update signals for
+ * both directions explicitly, as after the track is removed it won't
+ * 'connect' with the other piece. */
+ SetSignalsOnBothDir(tile, TRACK_X);
+ SetSignalsOnBothDir(tile, TRACK_Y);
+ YapfNotifyTrackLayoutChange(tile, TRACK_X);
+ YapfNotifyTrackLayoutChange(tile, TRACK_Y);
+ } else {
+ SetSignalsOnBothDir(tile, track);
+ YapfNotifyTrackLayoutChange(tile, track);
+ }
+ }
+
+ return cost;
+}
+
+
+static const TileIndexDiffC _trackdelta[] = {
+ { -1, 0 }, { 0, 1 }, { -1, 0 }, { 0, 1 }, { 1, 0 }, { 0, 1 },
+ { 0, 0 },
+ { 0, 0 },
+ { 1, 0 }, { 0, -1 }, { 0, -1 }, { 1, 0 }, { 0, -1 }, { -1, 0 },
+ { 0, 0 },
+ { 0, 0 }
+};
+
+
+static int32 ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)
+{
+ int x = TileX(start);
+ int y = TileY(start);
+ int ex = TileX(end);
+ int ey = TileY(end);
+ int dx, dy, trdx, trdy;
+
+ if (!ValParamTrackOrientation(*trackdir)) return CMD_ERROR;
+
+ // calculate delta x,y from start to end tile
+ dx = ex - x;
+ dy = ey - y;
+
+ // calculate delta x,y for the first direction
+ trdx = _trackdelta[*trackdir].x;
+ trdy = _trackdelta[*trackdir].y;
+
+ if (!IsDiagonalTrackdir(*trackdir)) {
+ trdx += _trackdelta[*trackdir ^ 1].x;
+ trdy += _trackdelta[*trackdir ^ 1].y;
+ }
+
+ // validate the direction
+ while (
+ (trdx <= 0 && dx > 0) ||
+ (trdx >= 0 && dx < 0) ||
+ (trdy <= 0 && dy > 0) ||
+ (trdy >= 0 && dy < 0)
+ ) {
+ if (!HASBIT(*trackdir, 3)) { // first direction is invalid, try the other
+ SETBIT(*trackdir, 3); // reverse the direction
+ trdx = -trdx;
+ trdy = -trdy;
+ } else { // other direction is invalid too, invalid drag
+ return CMD_ERROR;
+ }
+ }
+
+ // (for diagonal tracks, this is already made sure of by above test), but:
+ // for non-diagonal tracks, check if the start and end tile are on 1 line
+ if (!IsDiagonalTrackdir(*trackdir)) {
+ trdx = _trackdelta[*trackdir].x;
+ trdy = _trackdelta[*trackdir].y;
+ if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))
+ return CMD_ERROR;
+ }
+
+ return 0;
+}
+
+/** Build a stretch of railroad tracks.
+ * @param tile start tile of drag
+ * @param p1 end tile of drag
+ * @param p2 various bitstuffed elements
+ * - p2 = (bit 0-3) - railroad type normal/maglev (0 = normal, 1 = mono, 2 = maglev)
+ * - p2 = (bit 4-6) - track-orientation, valid values: 0-5 (Track enum)
+ * - p2 = (bit 7) - 0 = build, 1 = remove tracks
+ */
+static int32 CmdRailTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ int32 ret, total_cost = 0;
+ Track track = (Track)GB(p2, 4, 3);
+ Trackdir trackdir;
+ byte mode = HASBIT(p2, 7);
+ RailType railtype = (RailType)GB(p2, 0, 4);
+ TileIndex end_tile;
+
+ if (!ValParamRailtype(railtype) || !ValParamTrackOrientation(track)) return CMD_ERROR;
+ if (p1 >= MapSize()) return CMD_ERROR;
+ end_tile = p1;
+ trackdir = TrackToTrackdir(track);
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
+
+ if (flags & DC_EXEC) SndPlayTileFx(SND_20_SPLAT_2, tile);
+
+ for (;;) {
+ ret = DoCommand(tile, railtype, TrackdirToTrack(trackdir), flags, (mode == 0) ? CMD_BUILD_SINGLE_RAIL : CMD_REMOVE_SINGLE_RAIL);
+
+ if (CmdFailed(ret)) {
+ if ((_error_message != STR_1007_ALREADY_BUILT) && (mode == 0)) break;
+ _error_message = INVALID_STRING_ID;
+ } else {
+ total_cost += ret;
+ }
+
+ if (tile == end_tile) break;
+
+ tile += ToTileIndexDiff(_trackdelta[trackdir]);
+
+ // toggle railbit for the non-diagonal tracks
+ if (!IsDiagonalTrackdir(trackdir)) trackdir ^= 1;
+ }
+
+ return (total_cost == 0) ? CMD_ERROR : total_cost;
+}
+
+/** Build rail on a stretch of track.
+ * Stub for the unified rail builder/remover
+ * @see CmdRailTrackHelper
+ */
+int32 CmdBuildRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ return CmdRailTrackHelper(tile, flags, p1, CLRBIT(p2, 7));
+}
+
+/** Build rail on a stretch of track.
+ * Stub for the unified rail builder/remover
+ * @see CmdRailTrackHelper
+ */
+int32 CmdRemoveRailroadTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ return CmdRailTrackHelper(tile, flags, p1, SETBIT(p2, 7));
+}
+
+/** Build a train depot
+ * @param tile position of the train depot
+ * @param p1 rail type
+ * @param p2 entrance direction (DiagDirection)
+ *
+ * @todo When checking for the tile slope,
+ * distingush between "Flat land required" and "land sloped in wrong direction"
+ */
+int32 CmdBuildTrainDepot(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ Depot *d;
+ int32 cost, ret;
+ Slope tileh;
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ if (!EnsureNoVehicle(tile)) return CMD_ERROR;
+ /* check railtype and valid direction for depot (0 through 3), 4 in total */
+ if (!ValParamRailtype(p1) || p2 > 3) return CMD_ERROR;
+
+ tileh = GetTileSlope(tile, NULL);
+
+ /* Prohibit construction if
+ * The tile is non-flat AND
+ * 1) The AI is "old-school"
+ * 2) build-on-slopes is disabled
+ * 3) the tile is steep i.e. spans two height levels
+ * 4) the exit points in the wrong direction
+ */
+
+ if (tileh != SLOPE_FLAT && (
+ _is_old_ai_player ||
+ !_patches.build_on_slopes ||
+ IsSteepSlope(tileh) ||
+ !CanBuildDepotByTileh(p2, tileh)
+ )) {
+ return_cmd_error(STR_0007_FLAT_LAND_REQUIRED);
+ }
+
+ ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+ if (CmdFailed(ret)) return CMD_ERROR;
+ cost = ret;
+
+ if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
+
+ d = AllocateDepot();
+ if (d == NULL) return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ MakeRailDepot(tile, _current_player, p2, p1);
+ MarkTileDirtyByTile(tile);
+
+ d->xy = tile;
+ d->town_index = ClosestTownFromTile(tile, (uint)-1)->index;
+
+ UpdateSignalsOnSegment(tile, p2);
+ YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(p2)));
+ }
+
+ return cost + _price.build_train_depot;
+}
+
+/** Build signals, alternate between double/single, signal/semaphore,
+ * pre/exit/combo-signals, and what-else not
+ * @param tile tile where to build the signals
+ * @param p1 various bitstuffed elements
+ * - p1 = (bit 0-2) - track-orientation, valid values: 0-5 (Track enum)
+ * - p1 = (bit 3) - choose semaphores/signals or cycle normal/pre/exit/combo depending on context
+ * @param p2 used for CmdBuildManySignals() to copy direction of first signal
+ * TODO: p2 should be replaced by two bits for "along" and "against" the track.
+ */
+int32 CmdBuildSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ SignalVariant sigvar;
+ bool pre_signal;
+ Track track = (Track)(p1 & 0x7);
+ int32 cost;
+
+ // Same bit, used in different contexts
+ sigvar = HASBIT(p1, 3) ? SIG_SEMAPHORE : SIG_ELECTRIC;
+ pre_signal = HASBIT(p1, 3);
+
+ if (!ValParamTrackOrientation(track) || !IsTileType(tile, MP_RAILWAY) || !EnsureNoVehicle(tile))
+ return CMD_ERROR;
+
+ /* Protect against invalid signal copying */
+ if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
+
+ /* You can only build signals on plain rail tiles, and the selected track must exist */
+ if (!IsPlainRailTile(tile) || !HasTrack(tile, track)) return CMD_ERROR;
+
+ if (!CheckTileOwnership(tile)) return CMD_ERROR;
+
+ _error_message = STR_1005_NO_SUITABLE_RAILROAD_TRACK;
+
+ {
+ /* See if this is a valid track combination for signals, (ie, no overlap) */
+ TrackBits trackbits = GetTrackBits(tile);
+ if (KILL_FIRST_BIT(trackbits) != 0 && /* More than one track present */
+ trackbits != TRACK_BIT_HORZ &&
+ trackbits != TRACK_BIT_VERT) {
+ return CMD_ERROR;
+ }
+ }
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ if (!HasSignalOnTrack(tile, track)) {
+ // build new signals
+ cost = _price.build_signals;
+ } else {
+ if (p2 != 0 && sigvar != GetSignalVariant(tile)) {
+ // convert signals <-> semaphores
+ cost = _price.build_signals + _price.remove_signals;
+ } else {
+ // it is free to change orientation/pre-exit-combo signals
+ cost = 0;
+ }
+ }
+
+ if (flags & DC_EXEC) {
+ if (!HasSignals(tile)) {
+ // there are no signals at all on this tile yet
+ _m[tile].m5 |= RAIL_TILE_SIGNALS; // change into signals
+ _m[tile].m2 |= 0xF0; // all signals are on
+ _m[tile].m3 &= ~0xF0; // no signals built by default
+ SetSignalType(tile, SIGTYPE_NORMAL);
+ SetSignalVariant(tile, sigvar);
+ }
+
+ if (p2 == 0) {
+ if (!HasSignalOnTrack(tile, track)) {
+ // build new signals
+ _m[tile].m3 |= SignalOnTrack(track);
+ } else {
+ if (pre_signal) {
+ // cycle between normal -> pre -> exit -> combo -> ...
+ SignalType type = GetSignalType(tile);
+
+ SetSignalType(tile, type == SIGTYPE_COMBO ? SIGTYPE_NORMAL : type + 1);
+ } else {
+ CycleSignalSide(tile, track);
+ }
+ }
+ } else {
+ /* If CmdBuildManySignals is called with copying signals, just copy the
+ * direction of the first signal given as parameter by CmdBuildManySignals */
+ _m[tile].m3 &= ~SignalOnTrack(track);
+ _m[tile].m3 |= p2 & SignalOnTrack(track);
+ SetSignalVariant(tile, sigvar);
+ }
+
+ MarkTileDirtyByTile(tile);
+ SetSignalsOnBothDir(tile, track);
+ YapfNotifyTrackLayoutChange(tile, track);
+ }
+
+ return cost;
+}
+
+/** Build many signals by dragging; AutoSignals
+ * @param tile start tile of drag
+ * @param p1 end tile of drag
+ * @param p2 various bitstuffed elements
+ * - p2 = (bit 0) - 0 = build, 1 = remove signals
+ * - p2 = (bit 3) - 0 = signals, 1 = semaphores
+ * - p2 = (bit 4- 6) - track-orientation, valid values: 0-5 (Track enum)
+ * - p2 = (bit 24-31) - user defined signals_density
+ */
+static int32 CmdSignalTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ int32 ret, total_cost, signal_ctr;
+ byte signals;
+ bool error = true;
+ TileIndex end_tile;
+
+ int mode = p2 & 0x1;
+ Track track = GB(p2, 4, 3);
+ Trackdir trackdir = TrackToTrackdir(track);
+ byte semaphores = (HASBIT(p2, 3) ? 8 : 0);
+ byte signal_density = (p2 >> 24);
+
+ if (p1 >= MapSize()) return CMD_ERROR;
+ end_tile = p1;
+ if (signal_density == 0 || signal_density > 20) return CMD_ERROR;
+
+ if (!IsTileType(tile, MP_RAILWAY)) return CMD_ERROR;
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ /* for vertical/horizontal tracks, double the given signals density
+ * since the original amount will be too dense (shorter tracks) */
+ if (!IsDiagonalTrack(track)) signal_density *= 2;
+
+ if (CmdFailed(ValidateAutoDrag(&trackdir, tile, end_tile))) return CMD_ERROR;
+
+ track = TrackdirToTrack(trackdir); /* trackdir might have changed, keep track in sync */
+
+ // copy the signal-style of the first rail-piece if existing
+ if (HasSignals(tile)) {
+ signals = _m[tile].m3 & SignalOnTrack(track);
+ if (signals == 0) signals = SignalOnTrack(track); /* Can this actually occur? */
+
+ // copy signal/semaphores style (independent of CTRL)
+ semaphores = (GetSignalVariant(tile) == SIG_ELECTRIC ? 0 : 8);
+ } else { // no signals exist, drag a two-way signal stretch
+ signals = SignalOnTrack(track);
+ }
+
+ /* signal_ctr - amount of tiles already processed
+ * signals_density - patch setting to put signal on every Nth tile (double space on |, -- tracks)
+ **********
+ * trackdir - trackdir to build with autorail
+ * semaphores - semaphores or signals
+ * signals - is there a signal/semaphore on the first tile, copy its style (two-way/single-way)
+ * and convert all others to semaphore/signal
+ * mode - 1 remove signals, 0 build signals */
+ signal_ctr = total_cost = 0;
+ for (;;) {
+ // only build/remove signals with the specified density
+ if (signal_ctr % signal_density == 0) {
+ ret = DoCommand(tile, TrackdirToTrack(trackdir) | semaphores, signals, flags, (mode == 1) ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
+
+ /* Be user-friendly and try placing signals as much as possible */
+ if (!CmdFailed(ret)) {
+ error = false;
+ total_cost += ret;
+ }
+ }
+
+ if (tile == end_tile) break;
+
+ tile += ToTileIndexDiff(_trackdelta[trackdir]);
+ signal_ctr++;
+
+ // toggle railbit for the non-diagonal tracks (|, -- tracks)
+ if (!IsDiagonalTrackdir(trackdir)) trackdir ^= 1;
+ }
+
+ return error ? CMD_ERROR : total_cost;
+}
+
+/** Build signals on a stretch of track.
+ * Stub for the unified signal builder/remover
+ * @see CmdSignalTrackHelper
+ */
+int32 CmdBuildSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ return CmdSignalTrackHelper(tile, flags, p1, p2);
+}
+
+/** Remove signals
+ * @param tile coordinates where signal is being deleted from
+ * @param p1 track to remove signal from (Track enum)
+ */
+int32 CmdRemoveSingleSignal(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ Track track = (Track)(p1 & 0x7);
+
+ if (!ValParamTrackOrientation(track) ||
+ !IsTileType(tile, MP_RAILWAY) ||
+ !EnsureNoVehicle(tile) ||
+ !HasSignalOnTrack(tile, track)) {
+ return CMD_ERROR;
+ }
+
+ /* Only water can remove signals from anyone */
+ if (_current_player != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ /* Do it? */
+ if (flags & DC_EXEC) {
+ _m[tile].m3 &= ~SignalOnTrack(track);
+
+ /* removed last signal from tile? */
+ if (GB(_m[tile].m3, 4, 4) == 0) {
+ SB(_m[tile].m2, 4, 4, 0);
+ SB(_m[tile].m5, 6, 2, RAIL_TILE_NORMAL >> 6); // XXX >> because the constant is meant for direct application, not use with SB
+ SetSignalVariant(tile, SIG_ELECTRIC); // remove any possible semaphores
+ }
+
+ SetSignalsOnBothDir(tile, track);
+ YapfNotifyTrackLayoutChange(tile, track);
+
+ MarkTileDirtyByTile(tile);
+ }
+
+ return _price.remove_signals;
+}
+
+/** Remove signals on a stretch of track.
+ * Stub for the unified signal builder/remover
+ * @see CmdSignalTrackHelper
+ */
+int32 CmdRemoveSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ return CmdSignalTrackHelper(tile, flags, p1, SETBIT(p2, 0));
+}
+
+typedef int32 DoConvertRailProc(TileIndex tile, RailType totype, bool exec);
+
+static int32 DoConvertRail(TileIndex tile, RailType totype, bool exec)
+{
+ if (!CheckTileOwnership(tile)) return CMD_ERROR;
+
+ if (!EnsureNoVehicle(tile) && (!IsCompatibleRail(GetRailType(tile), totype) || IsPlainRailTile(tile))) return CMD_ERROR;
+
+ // tile is already of requested type?
+ if (GetRailType(tile) == totype) return CMD_ERROR;
+
+ // 'hidden' elrails can't be downgraded to normal rail when elrails are disabled
+ if (_patches.disable_elrails && totype == RAILTYPE_RAIL && GetRailType(tile) == RAILTYPE_ELECTRIC) return CMD_ERROR;
+
+ // change type.
+ if (exec) {
+ TrackBits tracks;
+ SetRailType(tile, totype);
+ MarkTileDirtyByTile(tile);
+
+ // notify YAPF about the track layout change
+ for (tracks = GetTrackBits(tile); tracks != TRACK_BIT_NONE; tracks = KILL_FIRST_BIT(tracks))
+ YapfNotifyTrackLayoutChange(tile, FIND_FIRST_BIT(tracks));
+
+ if (IsTileDepotType(tile, TRANSPORT_RAIL)) {
+ Vehicle *v;
+
+ /* Update build vehicle window related to this depot */
+ InvalidateWindowData(WC_BUILD_VEHICLE, tile);
+
+ /* update power of trains in this depot */
+ FOR_ALL_VEHICLES(v) {
+ if (v->type == VEH_Train && IsFrontEngine(v) && v->tile == tile && v->u.rail.track == 0x80) {
+ TrainPowerChanged(v);
+ }
+ }
+ }
+ }
+
+ return _price.build_rail / 2;
+}
+
+extern int32 DoConvertStationRail(TileIndex tile, RailType totype, bool exec);
+extern int32 DoConvertStreetRail(TileIndex tile, RailType totype, bool exec);
+extern int32 DoConvertTunnelBridgeRail(TileIndex tile, RailType totype, bool exec);
+
+/** Convert one rail type to the other. You can convert normal rail to
+ * monorail/maglev easily or vice-versa.
+ * @param tile end tile of rail conversion drag
+ * @param p1 start tile of drag
+ * @param p2 new railtype to convert to
+ */
+int32 CmdConvertRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+ int32 ret, cost, money;
+ int ex;
+ int ey;
+ int sx, sy, x, y;
+
+ SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+ if (!ValParamRailtype(p2)) return CMD_ERROR;
+ if (p1 >= MapSize()) return CMD_ERROR;
+
+ // make sure sx,sy are smaller than ex,ey
+ ex = TileX(tile);
+ ey = TileY(tile);
+ sx = TileX(p1);
+ sy = TileY(p1);
+ if (ex < sx) intswap(ex, sx);
+ if (ey < sy) intswap(ey, sy);
+
+ money = GetAvailableMoneyForCommand();
+ cost = 0;
+ ret = 0;
+
+ for (x = sx; x <= ex; ++x) {
+ for (y = sy; y <= ey; ++y) {
+ TileIndex tile = TileXY(x, y);
+ DoConvertRailProc* proc;
+
+ switch (GetTileType(tile)) {
+ case MP_RAILWAY: proc = DoConvertRail; break;
+ case MP_STATION: proc = DoConvertStationRail; break;
+ case MP_STREET: proc = DoConvertStreetRail; break;
+ case MP_TUNNELBRIDGE: proc = DoConvertTunnelBridgeRail; break;
+ default: continue;
+ }
+
+ ret = proc(tile, p2, false);
+ if (CmdFailed(ret)) continue;
+ cost += ret;
+
+ if (flags & DC_EXEC) {
+ money -= ret;
+ if (money < 0) {
+ _additional_cash_required = ret;
+ return cost - ret;
+ }
+ proc(tile, p2, true);
+ }
+ }
+ }
+
+ return (cost == 0) ? ret : cost;
+}
+
+static int32 RemoveTrainDepot(TileIndex tile, uint32 flags)
+{
+ if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER)
+ return CMD_ERROR;
+
+ if (!EnsureNoVehicle(tile))
+ return CMD_ERROR;
+
+ if (flags & DC_EXEC) {
+ DiagDirection dir = GetRailDepotDirection(tile);
+
+ DeleteDepot(GetDepotByTile(tile));
+ UpdateSignalsOnSegment(tile, dir);
+ YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(dir)));
+ }
+
+ return _price.remove_train_depot;
+}
+
+static int32 ClearTile_Track(TileIndex tile, byte flags)
+{
+ int32 cost;
+ int32 ret;
+
+ if (flags & DC_AUTO) {
+ if (!IsTileOwner(tile, _current_player))
+ return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);
+
+ if (IsPlainRailTile(tile)) {
+ return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);
+ } else {
+ return_cmd_error(STR_2004_BUILDING_MUST_BE_DEMOLISHED);
+ }
+ }
+
+ cost = 0;
+
+ switch (GetRailTileType(tile)) {
+ case RAIL_TILE_SIGNALS:
+ case RAIL_TILE_NORMAL: {
+ TrackBits tracks = GetTrackBits(tile);
+ uint i;
+
+ for_each_bit (i, tracks) {
+ ret = DoCommand(tile, 0, i, flags, CMD_REMOVE_SINGLE_RAIL);
+ if (CmdFailed(ret)) return CMD_ERROR;
+ cost += ret;
+ }
+ return cost;
+ }
+
+ case RAIL_TILE_DEPOT_WAYPOINT:
+ if (GetRailTileSubtype(tile) == RAIL_SUBTYPE_DEPOT) {
+ return RemoveTrainDepot(tile, flags);
+ } else {
+ return RemoveTrainWaypoint(tile, flags, false);
+ }
+
+ default:
+ return CMD_ERROR;
+ }
+}
+
+#include "table/track_land.h"
+
+static void DrawSingleSignal(TileIndex tile, byte condition, uint image, uint pos)
+{
+ bool side = _opt.road_side & _patches.signal_side;
+ static const Point SignalPositions[2][12] = {
+ { /* Signals on the left side */
+ /* LEFT LEFT RIGHT RIGHT UPPER UPPER */
+ { 8, 5}, {14, 1}, { 1, 14}, { 9, 11}, { 1, 0}, { 3, 10},
+ /* LOWER LOWER X X Y Y */
+ {11, 4}, {14, 14}, {11, 3}, { 4, 13}, { 3, 4}, {11, 13}
+ }, { /* Signals on the right side */
+ /* LEFT LEFT RIGHT RIGHT UPPER UPPER */
+ {14, 1}, {12, 10}, { 4, 6}, { 1, 14}, {10, 4}, { 0, 1},
+ /* LOWER LOWER X X Y Y */
+ {14, 14}, { 5, 12}, {11, 13}, { 4, 3}, {13, 4}, { 3, 11}
+ }
+ };
+
+ static const SpriteID SignalBase[2][2][4] = {
+ { /* Signals on left side */
+ { 0x4FB, 0x1323, 0x1333, 0x1343}, /* light signals */
+ { 0x1353, 0x1363, 0x1373, 0x1383} /* semaphores */
+ }, { /* Signals on right side */
+ { 0x4FB, 0x1323, 0x1333, 0x1343}, /* light signals */
+ { 0x1446, 0x1456, 0x1466, 0x1476} /* semaphores */
+ /* | | | | */
+ /* normal, entry, exit, combo */
+ }
+ };
+
+ uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
+ uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;
+
+ SpriteID sprite;
+
+ /* _signal_base is set by our NewGRF Action 5 loader. If it is 0 then we
+ * just draw the standard signals, else we get the offset from _signal_base
+ * and draw that sprite. All the signal sprites are loaded sequentially. */
+ if (_signal_base == 0 || (GetSignalType(tile) == 0 && GetSignalVariant(tile) == SIG_ELECTRIC)) {
+ sprite = SignalBase[side][GetSignalVariant(tile)][GetSignalType(tile)] + image + condition;
+ } else {
+ sprite = _signal_base + (GetSignalType(tile) - 1) * 16 + GetSignalVariant(tile) * 64 + image + condition;
+ }
+
+ AddSortableSpriteToDraw(sprite, x, y, 1, 1, 10, GetSlopeZ(x,y));
+}
+
+static uint32 _drawtile_track_palette;
+
+
+static void DrawTrackFence_NW(const TileInfo *ti)
+{
+ uint32 image = 0x515;
+ if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? 0x519 : 0x51B;
+ AddSortableSpriteToDraw(image | _drawtile_track_palette,
+ ti->x, ti->y + 1, 16, 1, 4, ti->z);
+}
+
+static void DrawTrackFence_SE(const TileInfo *ti)
+{
+ uint32 image = 0x515;
+ if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? 0x519 : 0x51B;
+ AddSortableSpriteToDraw(image | _drawtile_track_palette,
+ ti->x, ti->y + TILE_SIZE - 1, 16, 1, 4, ti->z);
+}
+
+static void DrawTrackFence_NW_SE(const TileInfo *ti)
+{
+ DrawTrackFence_NW(ti);
+ DrawTrackFence_SE(ti);
+}
+
+static void DrawTrackFence_NE(const TileInfo *ti)
+{
+ uint32 image = 0x516;
+ if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? 0x51A : 0x51C;
+ AddSortableSpriteToDraw(image | _drawtile_track_palette,
+ ti->x + 1, ti->y, 1, 16, 4, ti->z);
+}
+
+static void DrawTrackFence_SW(const TileInfo *ti)
+{
+ uint32 image = 0x516;
+ if (ti->tileh != SLOPE_FLAT) image = (ti->tileh & SLOPE_S) ? 0x51A : 0x51C;
+ AddSortableSpriteToDraw(image | _drawtile_track_palette,
+ ti->x + TILE_SIZE - 1, ti->y, 1, 16, 4, ti->z);
+}
+
+static void DrawTrackFence_NE_SW(const TileInfo *ti)
+{
+ DrawTrackFence_NE(ti);
+ DrawTrackFence_SW(ti);
+}
+
+static void DrawTrackFence_NS_1(const TileInfo *ti)
+{
+ int z = ti->z;
+ if (ti->tileh & SLOPE_W) z += TILE_HEIGHT;
+ AddSortableSpriteToDraw(0x517 | _drawtile_track_palette,
+ ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
+}
+
+static void DrawTrackFence_NS_2(const TileInfo *ti)
+{
+ int z = ti->z;
+ if (ti->tileh & SLOPE_E) z += TILE_HEIGHT;
+ AddSortableSpriteToDraw(0x517 | _drawtile_track_palette,
+ ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
+}
+
+static void DrawTrackFence_WE_1(const TileInfo *ti)
+{
+ int z = ti->z;
+ if (ti->tileh & SLOPE_N) z += TILE_HEIGHT;
+ AddSortableSpriteToDraw(0x518 | _drawtile_track_palette,
+ ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
+}
+
+static void DrawTrackFence_WE_2(const TileInfo *ti)
+{
+ int z = ti->z;
+ if (ti->tileh & SLOPE_S) z += TILE_HEIGHT;
+ AddSortableSpriteToDraw(0x518 | _drawtile_track_palette,
+ ti->x + TILE_SIZE / 2, ti->y + TILE_SIZE / 2, 1, 1, 4, z);
+}
+
+
+static void DrawTrackDetails(const TileInfo* ti)
+{
+ switch (GetRailGroundType(ti->tile)) {
+ case RAIL_GROUND_FENCE_NW: DrawTrackFence_NW(ti); break;
+ case RAIL_GROUND_FENCE_SE: DrawTrackFence_SE(ti); break;
+ case RAIL_GROUND_FENCE_SENW: DrawTrackFence_NW_SE(ti); break;
+ case RAIL_GROUND_FENCE_NE: DrawTrackFence_NE(ti); break;
+ case RAIL_GROUND_FENCE_SW: DrawTrackFence_SW(ti); break;
+ case RAIL_GROUND_FENCE_NESW: DrawTrackFence_NE_SW(ti); break;
+ case RAIL_GROUND_FENCE_VERT1: DrawTrackFence_NS_1(ti); break;
+ case RAIL_GROUND_FENCE_VERT2: DrawTrackFence_NS_2(ti); break;
+ case RAIL_GROUND_FENCE_HORIZ1: DrawTrackFence_WE_1(ti); break;
+ case RAIL_GROUND_FENCE_HORIZ2: DrawTrackFence_WE_2(ti); break;
+ default: break;
+ }
+}
+
+
+/**
+ * Draw ground sprite and track bits
+ * @param ti TileInfo
+ * @param track TrackBits to draw
+ * @param earth Draw as earth
+ * @param snow Draw as snow
+ * @param flat Always draw foundation
+ */
+static void DrawTrackBits(TileInfo* ti, TrackBits track)
+{
+ const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
+ PalSpriteID image;
+ bool junction = false;
+
+ // Select the sprite to use.
+ (image = rti->base_sprites.track_y, track == TRACK_BIT_Y) ||
+ (image++, track == TRACK_BIT_X) ||
+ (image++, track == TRACK_BIT_UPPER) ||
+ (image++, track == TRACK_BIT_LOWER) ||
+ (image++, track == TRACK_BIT_RIGHT) ||
+ (image++, track == TRACK_BIT_LEFT) ||
+ (image++, track == TRACK_BIT_CROSS) ||
+
+ (image = rti->base_sprites.track_ns, track == TRACK_BIT_HORZ) ||
+ (image++, track == TRACK_BIT_VERT) ||
+
+ (junction = true, false) ||
+ (image = rti->base_sprites.ground, (track & TRACK_BIT_3WAY_NE) == 0) ||
+ (image++, (track & TRACK_BIT_3WAY_SW) == 0) ||
+ (image++, (track & TRACK_BIT_3WAY_NW) == 0) ||
+ (image++, (track & TRACK_BIT_3WAY_SE) == 0) ||
+ (image++, true);
+
+ if (ti->tileh != SLOPE_FLAT) {
+ uint foundation = GetRailFoundation(ti->tileh, track);
+
+ if (foundation != 0) DrawFoundation(ti, foundation);
+
+ // DrawFoundation() modifies ti.
+ // Default sloped sprites..
+ if (ti->tileh != SLOPE_FLAT)
+ image = _track_sloped_sprites[ti->tileh - 1] + rti->base_sprites.track_y;
+ }
+
+ switch (GetRailGroundType(ti->tile)) {
+ case RAIL_GROUND_BARREN: image |= PALETTE_TO_BARE_LAND; break;
+ case RAIL_GROUND_ICE_DESERT: image += rti->snow_offset; break;
+ default: break;
+ }
+
+ DrawGroundSprite(image);
+
+ // Draw track pieces individually for junction tiles
+ if (junction) {
+ if (track & TRACK_BIT_X) DrawGroundSprite(rti->base_sprites.single_y);
+ if (track & TRACK_BIT_Y) DrawGroundSprite(rti->base_sprites.single_x);
+ if (track & TRACK_BIT_UPPER) DrawGroundSprite(rti->base_sprites.single_n);
+ if (track & TRACK_BIT_LOWER) DrawGroundSprite(rti->base_sprites.single_s);
+ if (track & TRACK_BIT_LEFT) DrawGroundSprite(rti->base_sprites.single_w);
+ if (track & TRACK_BIT_RIGHT) DrawGroundSprite(rti->base_sprites.single_e);
+ }
+
+ if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) DrawCatenary(ti);
+
+}
+
+static void DrawSignals(TileIndex tile, TrackBits rails)
+{
+#define MAYBE_DRAW_SIGNAL(x,y,z) if (IsSignalPresent(tile, x)) DrawSingleSignal(tile, GetSingleSignalState(tile, x), y - 0x4FB, z)
+
+ if (!(rails & TRACK_BIT_Y)) {
+ if (!(rails & TRACK_BIT_X)) {
+ if (rails & TRACK_BIT_LEFT) {
+ MAYBE_DRAW_SIGNAL(2, 0x509, 0);
+ MAYBE_DRAW_SIGNAL(3, 0x507, 1);
+ }
+ if (rails & TRACK_BIT_RIGHT) {
+ MAYBE_DRAW_SIGNAL(0, 0x509, 2);
+ MAYBE_DRAW_SIGNAL(1, 0x507, 3);
+ }
+ if (rails & TRACK_BIT_UPPER) {
+ MAYBE_DRAW_SIGNAL(3, 0x505, 4);
+ MAYBE_DRAW_SIGNAL(2, 0x503, 5);
+ }
+ if (rails & TRACK_BIT_LOWER) {
+ MAYBE_DRAW_SIGNAL(1, 0x505, 6);
+ MAYBE_DRAW_SIGNAL(0, 0x503, 7);
+ }
+ } else {
+ MAYBE_DRAW_SIGNAL(3, 0x4FB, 8);
+ MAYBE_DRAW_SIGNAL(2, 0x4FD, 9);
+ }
+ } else {
+ MAYBE_DRAW_SIGNAL(3, 0x4FF, 10);
+ MAYBE_DRAW_SIGNAL(2, 0x501, 11);
+ }
+}
+
+static void DrawTile_Track(TileInfo *ti)
+{
+ const RailtypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));
+ PalSpriteID image;
+
+ _drawtile_track_palette = SPRITE_PALETTE(PLAYER_SPRITE_COLOR(GetTileOwner(ti->tile)));
+
+ if (IsPlainRailTile(ti->tile)) {
+ TrackBits rails = GetTrackBits(ti->tile);
+
+ DrawTrackBits(ti, rails);
+
+ if (_display_opt & DO_FULL_DETAIL) DrawTrackDetails(ti);
+
+ if (HasSignals(ti->tile)) DrawSignals(ti->tile, rails);
+ } else {
+ // draw depot/waypoint
+ const DrawTileSprites* dts;
+ const DrawTileSeqStruct* dtss;
+ uint32 relocation;
+
+ if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, ti->tileh);
+
+ if (GetRailTileSubtype(ti->tile) == RAIL_SUBTYPE_DEPOT) {
+ dts = &_depot_gfx_table[GetRailDepotDirection(ti->tile)];
+
+ relocation = rti->total_offset;
+
+ image = dts->ground_sprite;
+ if (image != SPR_FLAT_GRASS_TILE) image += rti->total_offset;
+
+ // adjust ground tile for desert
+ // don't adjust for snow, because snow in depots looks weird
+ if (IsSnowRailGround(ti->tile) && _opt.landscape == LT_DESERT) {
+ if (image != SPR_FLAT_GRASS_TILE) {
+ image += rti->snow_offset; // tile with tracks
+ } else {
+ image = SPR_FLAT_SNOWY_TILE; // flat ground
+ }
+ }
+ } else {
+ // look for customization
+ byte stat_id = GetWaypointByTile(ti->tile)->stat_id;
+ const StationSpec *statspec = GetCustomStationSpec(STAT_CLASS_WAYP, stat_id);
+
+ if (statspec != NULL) {
+ // emulate station tile - open with building
+ const Station* st = ComposeWaypointStation(ti->tile);
+ uint gfx = 2;
+
+ if (HASBIT(statspec->callbackmask, CBM_CUSTOM_LAYOUT)) {
+ uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0, 0, statspec, st, ti->tile);
+ if (callback != CALLBACK_FAILED) gfx = callback;
+ }
+
+ if (statspec->renderdata == NULL) {
+ dts = GetStationTileLayout(gfx);
+ } else {
+ dts = &statspec->renderdata[(gfx < statspec->tiles ? gfx : 0) + GetWaypointAxis(ti->tile)];
+ }
+
+ if (dts != NULL && dts->seq != NULL) {
+ relocation = GetCustomStationRelocation(statspec, st, ti->tile);
+
+ image = dts->ground_sprite;
+ if (HASBIT(image, 31)) {
+ CLRBIT(image, 31);
+ image += GetCustomStationGroundRelocation(statspec, st, ti->tile);
+ image += rti->custom_ground_offset;
+ } else {
+ image += rti->total_offset;
+ }
+ } else {
+ goto default_waypoint;
+ }
+ } else {
+default_waypoint:
+ // There is no custom layout, fall back to the default graphics
+ dts = &_waypoint_gfx_table[GetWaypointAxis(ti->tile)];
+ relocation = 0;
+ image = dts->ground_sprite + rti->total_offset;
+ if (IsSnowRailGround(ti->tile)) image += rti->snow_offset;
+ }
+ }
+
+ DrawGroundSprite(image);
+
+ if (GetRailType(ti->tile) == RAILTYPE_ELECTRIC) DrawCatenary(ti);
+
+ foreach_draw_tile_seq(dtss, dts->seq) {
+ uint32 image = dtss->image + relocation;
+
+ if (_display_opt & DO_TRANS_BUILDINGS) {
+ MAKE_TRANSPARENT(image);
+ } else if (image & PALETTE_MODIFIER_COLOR) {
+ image |= _drawtile_track_palette;
+ }
+ AddSortableSpriteToDraw(
+ image,
+ ti->x + dtss->delta_x, ti->y + dtss->delta_y,
+ dtss->size_x, dtss->size_y,
+ dtss->size_z, ti->z + dtss->delta_z
+ );
+ }
+ }
+ DrawBridgeMiddle(ti);
+}
+
+
+static void DrawTileSequence(int x, int y, uint32 ground, const DrawTileSeqStruct* dtss, uint32 offset)
+{
+ uint32 palette = PLAYER_SPRITE_COLOR(_local_player);
+
+ DrawSprite(ground, x, y);
+ for (; dtss->image != 0; dtss++) {
+ Point pt = RemapCoords(dtss->delta_x, dtss->delta_y, dtss->delta_z);
+ uint32 image = dtss->image + offset;
+
+ if (image & PALETTE_MODIFIER_COLOR) image |= palette;
+ DrawSprite(image, x + pt.x, y + pt.y);
+ }
+}
+
+void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
+{
+ const DrawTileSprites* dts = &_depot_gfx_table[dir];
+ uint32 image = dts->ground_sprite;
+ uint32 offset = GetRailTypeInfo(railtype)->total_offset;
+
+ if (image != SPR_FLAT_GRASS_TILE) image += offset;
+ DrawTileSequence(x + 33, y + 17, image, dts->seq, offset);
+}
+
+void DrawDefaultWaypointSprite(int x, int y, RailType railtype)
+{
+ uint32 offset = GetRailTypeInfo(railtype)->total_offset;
+ const DrawTileSprites* dts = &_waypoint_gfx_table[AXIS_X];
+
+ DrawTileSequence(x, y, dts->ground_sprite + offset, dts->seq, 0);
+}
+
+typedef struct SetSignalsData {
+ int cur;
+ int cur_stack;
+ bool stop;
+ bool has_presignal;
+
+ // presignal info
+ int presignal_exits;
+ int presignal_exits_free;
+
+ // these are used to keep track of the signals that change.
+ byte bit[NUM_SSD_ENTRY];
+ TileIndex tile[NUM_SSD_ENTRY];
+
+ // these are used to keep track of the stack that modifies presignals recursively
+ TileIndex next_tile[NUM_SSD_STACK];
+ byte next_dir[NUM_SSD_STACK];
+
+} SetSignalsData;
+
+static bool SetSignalsEnumProc(TileIndex tile, void* data, int track, uint length, byte* state)
+{
+ SetSignalsData* ssd = data;
+
+ if (!IsTileType(tile, MP_RAILWAY)) return false;
+
+ // the tile has signals?
+ if (HasSignalOnTrack(tile, TrackdirToTrack(track))) {
+ if (HasSignalOnTrackdir(tile, ReverseTrackdir(track))) {
+ // yes, add the signal to the list of signals
+ if (ssd->cur != NUM_SSD_ENTRY) {
+ ssd->tile[ssd->cur] = tile; // remember the tile index
+ ssd->bit[ssd->cur] = track; // and the controlling bit number
+ ssd->cur++;
+ }
+
+ // remember if this block has a presignal.
+ ssd->has_presignal |= IsPresignalEntry(tile);
+ }
+
+ if (HasSignalOnTrackdir(tile, track) && IsPresignalExit(tile)) {
+ // this is an exit signal that points out from the segment
+ ssd->presignal_exits++;
+ if (GetSignalStateByTrackdir(tile, track) != SIGNAL_STATE_RED)
+ ssd->presignal_exits_free++;
+ }
+
+ return true;
+ } else if (IsTileDepotType(tile, TRANSPORT_RAIL)) {
+ return true; // don't look further if the tile is a depot
+ }
+
+ return false;
+}
+
+/* Struct to parse data from VehicleFromPos to SignalVehicleCheckProc */
+typedef struct SignalVehicleCheckStruct {
+ TileIndex tile;
+ uint track;
+} SignalVehicleCheckStruct;
+
+static void *SignalVehicleCheckProc(Vehicle *v, void *data)
+{
+ const SignalVehicleCheckStruct* dest = data;
+
+ if (v->type != VEH_Train) return NULL;
+
+ /* Wrong tile, or no train? Not a match */
+ if (v->tile != dest->tile) return NULL;
+
+ /* Are we on the same piece of track? */
+ if (dest->track & v->u.rail.track * 0x101) return v;
+
+ return NULL;
+}
+
+/* Special check for SetSignalsAfterProc, to see if there is a vehicle on this tile */
+static bool SignalVehicleCheck(TileIndex tile, uint track)
+{
+ SignalVehicleCheckStruct dest;
+
+ dest.tile = tile;
+ dest.track = track;
+
+ /* Locate vehicles in tunnels or on bridges */
+ if (IsTunnelTile(tile) || IsBridgeTile(tile)) {
+ TileIndex end;
+ DiagDirection direction;
+
+ if (IsTunnelTile(tile)) {
+ end = GetOtherTunnelEnd(tile);
+ direction = GetTunnelDirection(tile);
+ } else {
+ end = GetOtherBridgeEnd(tile);
+ direction = GetBridgeRampDirection(tile);
+ }
+
+ dest.track = 1 << (direction & 1); // get the trackbit the vehicle would have if it has not entered the tunnel yet (ie is still visible)
+
+ // check for a vehicle with that trackdir on the start tile of the tunnel
+ if (VehicleFromPos(tile, &dest, SignalVehicleCheckProc) != NULL) return true;
+
+ // check for a vehicle with that trackdir on the end tile of the tunnel
+ if (VehicleFromPos(end, &dest, SignalVehicleCheckProc) != NULL) return true;
+
+ // now check all tiles from start to end for a warping vehicle
+ // NOTE: the hashes for tiles may overlap, so this could maybe be optimised a bit by not checking every tile?
+ dest.track = 0x40; //Vehicle inside a tunnel or on a bridge
+ for (; tile != end; tile += TileOffsByDiagDir(direction)) {
+ if (VehicleFromPos(tile, &dest, SignalVehicleCheckProc) != NULL)
+ return true;
+ }
+
+ // no vehicle found
+ return false;
+ }
+
+ return VehicleFromPos(tile, &dest, SignalVehicleCheckProc) != NULL;
+}
+
+static void SetSignalsAfterProc(TrackPathFinder *tpf)
+{
+ SetSignalsData *ssd = tpf->userdata;
+ const TrackPathFinderLink* link;
+ uint offs;
+ uint i;
+
+ ssd->stop = false;
+
+ /* Go through all the PF tiles */
+ for (i = 0; i < lengthof(tpf->hash_head); i++) {
+ /* Empty hash item */
+ if (tpf->hash_head[i] == 0) continue;
+
+ /* If 0x8000 is not set, there is only 1 item */
+ if (!(tpf->hash_head[i] & 0x8000)) {
+ /* Check if there is a vehicle on this tile */
+ if (SignalVehicleCheck(tpf->hash_tile[i], tpf->hash_head[i])) {
+ ssd->stop = true;
+ return;
+ }
+ } else {
+ /* There are multiple items, where hash_tile points to the first item in the list */
+ offs = tpf->hash_tile[i];
+ do {
+ /* Find the next item */
+ link = PATHFIND_GET_LINK_PTR(tpf, offs);
+ /* Check if there is a vehicle on this tile */
+ if (SignalVehicleCheck(link->tile, link->flags)) {
+ ssd->stop = true;
+ return;
+ }
+ /* Goto the next item */
+ } while ((offs = link->next) != 0xFFFF);
+ }
+ }
+}
+
+static const byte _dir_from_track[14] = {
+ 0,1,0,1,2,1, 0,0,
+ 2,3,3,2,3,0,
+};
+
+
+static void ChangeSignalStates(SetSignalsData *ssd)
+{
+ int i;
+
+ // thinking about presignals...
+ // the presignal is green if,
+ // if no train is in the segment AND
+ // there is at least one green exit signal OR
+ // there are no exit signals in the segment
+
+ // then mark the signals in the segment accordingly
+ for (i = 0; i != ssd->cur; i++) {
+ TileIndex tile = ssd->tile[i];
+ byte bit = SignalAgainstTrackdir(ssd->bit[i]);
+ uint16 m2 = _m[tile].m2;
+
+ // presignals don't turn green if there is at least one presignal exit and none are free
+ if (IsPresignalEntry(tile)) {
+ int ex = ssd->presignal_exits, exfree = ssd->presignal_exits_free;
+
+ // subtract for dual combo signals so they don't count themselves
+ if (IsPresignalExit(tile) && HasSignalOnTrackdir(tile, ssd->bit[i])) {
+ ex--;
+ if (GetSignalStateByTrackdir(tile, ssd->bit[i]) != SIGNAL_STATE_RED) exfree--;
+ }
+
+ // if we have exits and none are free, make red.
+ if (ex && !exfree) goto make_red;
+ }
+
+ // check if the signal is unaffected.
+ if (ssd->stop) {
+make_red:
+ // turn red
+ if ((bit & m2) == 0) continue;
+ } else {
+ // turn green
+ if ((bit & m2) != 0) continue;
+ }
+
+ /* Update signals on the other side of this exit-combo signal; it changed. */
+ if (IsPresignalExit(tile)) {
+ if (ssd->cur_stack != NUM_SSD_STACK) {
+ ssd->next_tile[ssd->cur_stack] = tile;
+ ssd->next_dir[ssd->cur_stack] = _dir_from_track[ssd->bit[i]];
+ ssd->cur_stack++;
+ } else {
+ DEBUG(misc, 0, "NUM_SSD_STACK too small"); /// @todo WTF is this???
+ }
+ }
+
+ // it changed, so toggle it
+ _m[tile].m2 = m2 ^ bit;
+ MarkTileDirtyByTile(tile);
+ }
+}
+
+
+bool UpdateSignalsOnSegment(TileIndex tile, DiagDirection direction)
+{
+ SetSignalsData ssd;
+ int result = -1;
+
+ ssd.cur_stack = 0;
+
+ for (;;) {
+ // go through one segment and update all signals pointing into that segment.
+ ssd.cur = ssd.presignal_exits = ssd.presignal_exits_free = 0;
+ ssd.has_presignal = false;
+
+ FollowTrack(tile, 0xC000 | TRANSPORT_RAIL, direction, SetSignalsEnumProc, SetSignalsAfterProc, &ssd);
+ ChangeSignalStates(&ssd);
+
+ // remember the result only for the first iteration.
+ if (result < 0) {
+ // stay in depot while segment is occupied or while all presignal exits are blocked
+ result = ssd.stop || (ssd.presignal_exits > 0 && ssd.presignal_exits_free == 0);
+ }
+
+ // if any exit signals were changed, we need to keep going to modify the stuff behind those.
+ if (ssd.cur_stack == 0) break;
+
+ // one or more exit signals were changed, so we need to update another segment too.
+ tile = ssd.next_tile[--ssd.cur_stack];
+ direction = ssd.next_dir[ssd.cur_stack];
+ }
+
+ return result != 0;
+}
+
+void SetSignalsOnBothDir(TileIndex tile, byte track)
+{
+ static const DiagDirection _search_dir_1[] = {
+ DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_SW, DIAGDIR_SE
+ };
+ static const DiagDirection _search_dir_2[] = {
+ DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NW, DIAGDIR_NE
+ };
+
+ UpdateSignalsOnSegment(tile, _search_dir_1[track]);
+ UpdateSignalsOnSegment(tile, _search_dir_2[track]);
+}
+
+static uint GetSlopeZ_Track(TileIndex tile, uint x, uint y)
+{
+ uint z;
+ Slope tileh = GetTileSlope(tile, &z);
+
+ if (tileh == SLOPE_FLAT) return z;
+ if (IsPlainRailTile(tile)) {
+ uint f = GetRailFoundation(tileh, GetTrackBits(tile));
+
+ if (f != 0) {
+ if (IsSteepSlope(tileh)) {
+ z += TILE_HEIGHT;
+ } else if (f < 15) {
+ return z + TILE_HEIGHT; // leveled foundation
+ }
+ tileh = _inclined_tileh[f - 15]; // inclined foundation
+ }
+ return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
+ } else {
+ return z + TILE_HEIGHT;
+ }
+}
+
+static Slope GetSlopeTileh_Track(TileIndex tile, Slope tileh)
+{
+ if (tileh == SLOPE_FLAT) return SLOPE_FLAT;
+ if (IsPlainRailTile(tile)) {
+ uint f = GetRailFoundation(tileh, GetTrackBits(tile));
+
+ if (f == 0) return tileh;
+ if (f < 15) return SLOPE_FLAT; // leveled foundation
+ return _inclined_tileh[f - 15]; // inclined foundation
+ } else {
+ return SLOPE_FLAT;
+ }
+}
+
+static void GetAcceptedCargo_Track(TileIndex tile, AcceptedCargo ac)
+{
+ /* not used */
+}
+
+static void AnimateTile_Track(TileIndex tile)
+{
+ /* not used */
+}
+
+static void TileLoop_Track(TileIndex tile)
+{
+ RailGroundType old_ground = GetRailGroundType(tile);
+ RailGroundType new_ground;
+
+ switch (_opt.landscape) {
+ case LT_HILLY:
+ if (GetTileZ(tile) > _opt.snow_line) {
+ new_ground = RAIL_GROUND_ICE_DESERT;
+ goto set_ground;
+ }
+ break;
+
+ case LT_DESERT:
+ if (GetTropicZone(tile) == TROPICZONE_DESERT) {
+ new_ground = RAIL_GROUND_ICE_DESERT;
+ goto set_ground;
+ }
+ break;
+ }
+
+ if (!IsPlainRailTile(tile)) return;
+
+ new_ground = RAIL_GROUND_GRASS;
+
+ if (old_ground != RAIL_GROUND_BARREN) { /* wait until bottom is green */
+ /* determine direction of fence */
+ TrackBits rail = GetTrackBits(tile);
+
+ switch (rail) {
+ case TRACK_BIT_UPPER: new_ground = RAIL_GROUND_FENCE_HORIZ1; break;
+ case TRACK_BIT_LOWER: new_ground = RAIL_GROUND_FENCE_HORIZ2; break;
+ case TRACK_BIT_LEFT: new_ground = RAIL_GROUND_FENCE_VERT1; break;
+ case TRACK_BIT_RIGHT: new_ground = RAIL_GROUND_FENCE_VERT2; break;
+
+ default: {
+ PlayerID owner = GetTileOwner(tile);
+
+ if (rail == (TRACK_BIT_LOWER | TRACK_BIT_RIGHT) || (
+ (rail & TRACK_BIT_3WAY_NW) == 0 &&
+ (rail & TRACK_BIT_X)
+ )) {
+ TileIndex n = tile + TileDiffXY(0, -1);
+ TrackBits nrail = GetTrackBits(n);
+
+ if (!IsTileType(n, MP_RAILWAY) ||
+ !IsTileOwner(n, owner) ||
+ nrail == TRACK_BIT_UPPER ||
+ nrail == TRACK_BIT_LEFT) {
+ new_ground = RAIL_GROUND_FENCE_NW;
+ }
+ }
+
+ if (rail == (TRACK_BIT_UPPER | TRACK_BIT_LEFT) || (
+ (rail & TRACK_BIT_3WAY_SE) == 0 &&
+ (rail & TRACK_BIT_X)
+ )) {
+ TileIndex n = tile + TileDiffXY(0, 1);
+ TrackBits nrail = GetTrackBits(n);
+
+ if (!IsTileType(n, MP_RAILWAY) ||
+ !IsTileOwner(n, owner) ||
+ nrail == TRACK_BIT_LOWER ||
+ nrail == TRACK_BIT_RIGHT) {
+ new_ground = (new_ground == RAIL_GROUND_FENCE_NW) ?
+ RAIL_GROUND_FENCE_SENW : RAIL_GROUND_FENCE_SE;
+ }
+ }
+
+ if (rail == (TRACK_BIT_LOWER | TRACK_BIT_LEFT) || (
+ (rail & TRACK_BIT_3WAY_NE) == 0 &&
+ (rail & TRACK_BIT_Y)
+ )) {
+ TileIndex n = tile + TileDiffXY(-1, 0);
+ TrackBits nrail = GetTrackBits(n);
+
+ if (!IsTileType(n, MP_RAILWAY) ||
+ !IsTileOwner(n, owner) ||
+ nrail == TRACK_BIT_UPPER ||
+ nrail == TRACK_BIT_RIGHT) {
+ new_ground = RAIL_GROUND_FENCE_NE;
+ }
+ }
+
+ if (rail == (TRACK_BIT_UPPER | TRACK_BIT_RIGHT) || (
+ (rail & TRACK_BIT_3WAY_SW) == 0 &&
+ (rail & TRACK_BIT_Y)
+ )) {
+ TileIndex n = tile + TileDiffXY(1, 0);
+ TrackBits nrail = GetTrackBits(n);
+
+ if (!IsTileType(n, MP_RAILWAY) ||
+ !IsTileOwner(n, owner) ||
+ nrail == TRACK_BIT_LOWER ||
+ nrail == TRACK_BIT_LEFT) {
+ new_ground = (new_ground == RAIL_GROUND_FENCE_NE) ?
+ RAIL_GROUND_FENCE_NESW : RAIL_GROUND_FENCE_SW;
+ }
+ }
+ break;
+ }
+ }
+ }
+
+set_ground:
+ if (old_ground != new_ground) {
+ SetRailGroundType(tile, new_ground);
+ MarkTileDirtyByTile(tile);
+ }
+}
+
+
+static uint32 GetTileTrackStatus_Track(TileIndex tile, TransportType mode)
+{
+ byte a;
+ uint16 b;
+
+ if (mode != TRANSPORT_RAIL) return 0;
+
+ if (IsPlainRailTile(tile)) {
+ TrackBits rails = GetTrackBits(tile);
+ uint32 ret = rails * 0x101;
+
+ if (HasSignals(tile)) {
+ a = _m[tile].m3;
+ b = _m[tile].m2;
+
+ b &= a;
+
+ /* When signals are not present (in neither
+ * direction), we pretend them to be green. (So if
+ * signals are only one way, the other way will
+ * implicitely become `red' */
+ if ((a & 0xC0) == 0) b |= 0xC0;
+ if ((a & 0x30) == 0) b |= 0x30;
+
+ if ((b & 0x80) == 0) ret |= 0x10070000;
+ if ((b & 0x40) == 0) ret |= 0x07100000;
+ if ((b & 0x20) == 0) ret |= 0x20080000;
+ if ((b & 0x10) == 0) ret |= 0x08200000;
+ } else {
+ if (rails == TRACK_BIT_CROSS) ret |= 0x40;
+ }
+ return ret;
+ } else {
+ if (GetRailTileSubtype(tile) == RAIL_SUBTYPE_DEPOT) {
+ return AxisToTrackBits(DiagDirToAxis(GetRailDepotDirection(tile))) * 0x101;
+ } else {
+ return GetRailWaypointBits(tile) * 0x101;
+ }
+ }
+}
+
+static void ClickTile_Track(TileIndex tile)
+{
+ if (IsTileDepotType(tile, TRANSPORT_RAIL)) {
+ ShowDepotWindow(tile, VEH_Train);
+ } else if (IsRailWaypoint(tile)) {
+ ShowRenameWaypointWindow(GetWaypointByTile(tile));
+ }
+}
+
+static void GetTileDesc_Track(TileIndex tile, TileDesc *td)
+{
+ td->owner = GetTileOwner(tile);
+ switch (GetRailTileType(tile)) {
+ case RAIL_TILE_NORMAL:
+ td->str = STR_1021_RAILROAD_TRACK;
+ break;
+
+ case RAIL_TILE_SIGNALS: {
+ const StringID signal_type[] = {
+ STR_RAILROAD_TRACK_WITH_NORMAL_SIGNALS,
+ STR_RAILROAD_TRACK_WITH_PRESIGNALS,
+ STR_RAILROAD_TRACK_WITH_EXITSIGNALS,
+ STR_RAILROAD_TRACK_WITH_COMBOSIGNALS
+ };
+
+ td->str = signal_type[GetSignalType(tile)];
+ break;
+ }
+
+ case RAIL_TILE_DEPOT_WAYPOINT:
+ default:
+ td->str = (GetRailTileSubtype(tile) == RAIL_SUBTYPE_DEPOT) ?
+ STR_1023_RAILROAD_TRAIN_DEPOT : STR_LANDINFO_WAYPOINT;
+ break;
+ }
+}
+
+static void ChangeTileOwner_Track(TileIndex tile, PlayerID old_player, PlayerID new_player)
+{
+ if (!IsTileOwner(tile, old_player)) return;
+
+ if (new_player != PLAYER_SPECTATOR) {
+ SetTileOwner(tile, new_player);
+ } else {
+ DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
+ }
+}
+
+static const byte _fractcoords_behind[4] = { 0x8F, 0x8, 0x80, 0xF8 };
+static const byte _fractcoords_enter[4] = { 0x8A, 0x48, 0x84, 0xA8 };
+static const byte _deltacoord_leaveoffset[8] = {
+ -1, 0, 1, 0, /* x */
+ 0, 1, 0, -1 /* y */
+};
+
+static uint32 VehicleEnter_Track(Vehicle *v, TileIndex tile, int x, int y)
+{
+ byte fract_coord;
+ byte fract_coord_leave;
+ DiagDirection dir;
+ int length;
+
+ // this routine applies only to trains in depot tiles
+ if (v->type != VEH_Train || !IsTileDepotType(tile, TRANSPORT_RAIL)) return 0;
+
+ /* depot direction */
+ dir = GetRailDepotDirection(tile);
+
+ /* calculate the point where the following wagon should be activated */
+ /* this depends on the length of the current vehicle */
+ length = v->u.rail.cached_veh_length;
+
+ fract_coord_leave =
+ ((_fractcoords_enter[dir] & 0x0F) + // x
+ (length + 1) * _deltacoord_leaveoffset[dir]) +
+ (((_fractcoords_enter[dir] >> 4) + // y
+ ((length + 1) * _deltacoord_leaveoffset[dir+4])) << 4);
+
+ fract_coord = (x & 0xF) + ((y & 0xF) << 4);
+
+ if (_fractcoords_behind[dir] == fract_coord) {
+ /* make sure a train is not entering the tile from behind */
+ return 8;
+ } else if (_fractcoords_enter[dir] == fract_coord) {
+ if (DiagDirToDir(ReverseDiagDir(dir)) == v->direction) {
+ /* enter the depot */
+ v->u.rail.track = 0x80,
+ v->vehstatus |= VS_HIDDEN; /* hide it */
+ v->direction = ReverseDir(v->direction);
+ if (v->next == NULL) VehicleEnterDepot(v);
+ v->tile = tile;
+
+ InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
+ return 4;
+ }
+ } else if (fract_coord_leave == fract_coord) {
+ if (DiagDirToDir(dir) == v->direction) {
+ /* leave the depot? */
+ if ((v = v->next) != NULL) {
+ v->vehstatus &= ~VS_HIDDEN;
+ v->u.rail.track = (DiagDirToAxis(dir) == AXIS_X ? 1 : 2);
+ }
+ }
+ }
+
+ return 0;
+}
+
+
+const TileTypeProcs _tile_type_rail_procs = {
+ DrawTile_Track, /* draw_tile_proc */
+ GetSlopeZ_Track, /* get_slope_z_proc */
+ ClearTile_Track, /* clear_tile_proc */
+ GetAcceptedCargo_Track, /* get_accepted_cargo_proc */
+ GetTileDesc_Track, /* get_tile_desc_proc */
+ GetTileTrackStatus_Track, /* get_tile_track_status_proc */
+ ClickTile_Track, /* click_tile_proc */
+ AnimateTile_Track, /* animate_tile_proc */
+ TileLoop_Track, /* tile_loop_clear */
+ ChangeTileOwner_Track, /* change_tile_owner_clear */
+ NULL, /* get_produced_cargo_proc */
+ VehicleEnter_Track, /* vehicle_enter_tile_proc */
+ GetSlopeTileh_Track, /* get_slope_tileh_proc */
+};