@@ -1209,8 +1209,11 @@ CommandCost CmdBuildSingleSignal(TileInd
return cost;
}
static bool CheckSignalAutoFill(TileIndex &tile, Trackdir &trackdir, int &signal_ctr, bool remove)
static bool AdvanceSignalAutoFill(TileIndex &tile, Trackdir &trackdir, bool remove)
{
/* We only process starting tiles of tunnels or bridges so jump to the other end before moving further. */
if (IsTileType(tile, MP_TUNNELBRIDGE)) tile = GetOtherTunnelBridgeEnd(tile);
tile = AddTileIndexDiffCWrap(tile, _trackdelta[trackdir]);
if (tile == INVALID_TILE) return false;
@@ -1233,35 +1236,21 @@ static bool CheckSignalAutoFill(TileInde
case MP_RAILWAY:
if (IsRailDepot(tile)) return false;
if (!remove && HasSignalOnTrack(tile, TrackdirToTrack(trackdir))) return false;
signal_ctr++;
if (IsDiagonalTrackdir(trackdir)) {
/* Ensure signal_ctr even so X and Y pieces get signals */
ClrBit(signal_ctr, 0);
return true;
break;
case MP_ROAD:
if (!IsLevelCrossing(tile)) return false;
signal_ctr += 2;
case MP_TUNNELBRIDGE: {
TileIndex orig_tile = tile; // backup old value
if (GetTunnelBridgeTransportType(tile) != TRANSPORT_RAIL) return false;
if (GetTunnelBridgeDirection(tile) != TrackdirToExitdir(trackdir)) return false;
/* Skip to end of tunnel or bridge
* note that tile is a parameter by reference, so it must be updated */
tile = GetOtherTunnelBridgeEnd(tile);
signal_ctr += (GetTunnelBridgeLength(orig_tile, tile) + 2) * 2;
default: return false;
/**
@@ -1292,7 +1281,7 @@ static CommandCost CmdSignalTrackHelper(
bool remove = HasBit(p2, 5);
bool autofill = HasBit(p2, 6);
bool minimise_gaps = HasBit(p2, 10);
byte signal_density = GB(p2, 24, 8);
int signal_density = GB(p2, 24, 8);
if (p1 >= MapSize() || !ValParamTrackOrientation(track)) return CMD_ERROR;
TileIndex end_tile = p1;
@@ -1300,9 +1289,8 @@ static CommandCost CmdSignalTrackHelper(
if (!IsPlainRailTile(tile)) return_cmd_error(STR_ERROR_THERE_IS_NO_RAILROAD_TRACK);
/* for vertical/horizontal tracks, double the given signals density
* since the original amount will be too dense (shorter tracks) */
signal_density *= 2;
/* Interpret signal_density as the logical length of said amount of tiles in X/Y direction. */
signal_density *= TILE_AXIAL_DISTANCE;
Trackdir trackdir = TrackToTrackdir(track);
CommandCost ret = ValidateAutoDrag(&trackdir, tile, end_tile);
@@ -1350,86 +1338,128 @@ static CommandCost CmdSignalTrackHelper(
* and convert all others to semaphore/signal
* remove - 1 remove signals, 0 build signals */
int signal_ctr = 0;
int last_used_ctr = INT_MIN; // initially INT_MIN to force building/removing at the first tile
int last_used_ctr = -signal_density; // to force signal at first tile
int last_suitable_ctr = 0;
TileIndex last_suitable_tile = INVALID_TILE;
Trackdir last_suitable_trackdir = INVALID_TRACKDIR;
CommandCost last_error = CMD_ERROR;
bool had_success = false;
uint32 param1 = 0;
SB(param1, 3, 1, mode);
SB(param1, 4, 1, semaphores);
SB(param1, 5, 3, sigtype);
auto build_signal = [&](TileIndex tile, Trackdir trackdir, bool test_only) {
SB(param1, 0, 3, TrackdirToTrack(trackdir));
SB(param1, 17, 1, (!remove && signal_ctr == 0 ? 1 : 0));
/* Pick the correct orientation for the track direction */
byte signals = 0;
if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(trackdir);
if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(trackdir);
CommandCost ret = DoCommand(tile, param1, signals, test_only ? flags & ~DC_EXEC : flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
if (test_only) return ret.Succeeded();
if (ret.Succeeded()) {
had_success = true;
total_cost.AddCost(ret);
} else {
/* The "No railway" error is the least important one. */
if (ret.GetErrorMessage() != STR_ERROR_THERE_IS_NO_RAILROAD_TRACK ||
last_error.GetErrorMessage() == INVALID_STRING_ID) {
last_error = ret;
return ret.Succeeded();
};
for (;;) {
/* only build/remove signals with the specified density */
if (remove || minimise_gaps || signal_ctr % signal_density == 0) {
uint32 param1 = GB(TrackdirToTrack(trackdir), 0, 3);
if (!remove && signal_ctr == 0) SetBit(param1, 17);
signals = 0;
/* Test tiles in between for suitability as well if minimising gaps. */
bool test_only = !remove && minimise_gaps && signal_ctr < (last_used_ctr + signal_density);
/* Remember last track piece where we can place a signal. */
last_suitable_ctr = signal_ctr;
last_suitable_tile = tile;
last_suitable_trackdir = trackdir;
} else if (!test_only && last_suitable_tile != INVALID_TILE) {
/* If a signal can't be placed, place it at the last possible position. */
SB(param1, 0, 3, TrackdirToTrack(last_suitable_trackdir));
ClrBit(param1, 17);
/* Pick the correct orientation for the track direction. */
if (HasBit(signal_dir, 0)) signals |= SignalAlongTrackdir(last_suitable_trackdir);
if (HasBit(signal_dir, 1)) signals |= SignalAgainstTrackdir(last_suitable_trackdir);
ret = DoCommand(last_suitable_tile, param1, signals, flags, remove ? CMD_REMOVE_SIGNALS : CMD_BUILD_SIGNALS);
/* Collect cost. */
if (!test_only) {
/* Be user-friendly and try placing signals as much as possible */
if (remove) {
/* In remove mode last_* stuff doesn't matter, we simply try to clear every tile. */
build_signal(tile, trackdir, false);
} else if (minimise_gaps) {
/* We're trying to minimize gaps wherever possible, so keep track of last suitable
* position and use it if current gap exceeds required signal density. */
if (signal_ctr > last_used_ctr + signal_density && last_suitable_tile != INVALID_TILE) {
/* We overshot so build a signal in last good location. */
if (build_signal(last_suitable_tile, last_suitable_trackdir, false)) {
last_suitable_tile = INVALID_TILE;
last_used_ctr = last_suitable_ctr;
if (signal_ctr == last_used_ctr + signal_density) {
/* Current gap matches the required density, build a signal. */
if (build_signal(tile, trackdir, false)) {
last_used_ctr = signal_ctr;
/* Test tile for a potential signal spot. */
if (build_signal(tile, trackdir, true)) {
} else if(signal_ctr >= last_used_ctr + signal_density) {
/* We're always keeping regular interval between signals so doesn't matter whether we succeed or not. */
if (autofill) {
if (!CheckSignalAutoFill(tile, trackdir, signal_ctr, remove)) break;
switch (GetTileType(tile)) {
signal_ctr += (IsDiagonalTrackdir(trackdir) ? TILE_AXIAL_DISTANCE : TILE_CORNER_DISTANCE);
signal_ctr += TILE_AXIAL_DISTANCE;
uint len = (GetTunnelBridgeLength(tile, GetOtherTunnelBridgeEnd(tile)) + 2) * TILE_AXIAL_DISTANCE;
if (remove || minimise_gaps) {
signal_ctr += len;
/* To keep regular interval we need to emulate placing signals on a bridge.
* We start with TILE_AXIAL_DISTANCE as one bridge tile gets processed in the main loop. */
for(uint i = TILE_AXIAL_DISTANCE; i < len; i += TILE_AXIAL_DISTANCE) {
if (signal_ctr >= last_used_ctr + signal_density) last_used_ctr = signal_ctr;
default: break;
if (!AdvanceSignalAutoFill(tile, trackdir, remove)) break;
/* Prevent possible loops */
if (tile == start_tile && trackdir == start_trackdir) break;
if (tile == end_tile) break;
tile += ToTileIndexDiff(_trackdelta[trackdir]);
/* toggle railbit for the non-diagonal tracks (|, -- tracks) */
ToggleBit(trackdir, 0);
if (!IsDiagonalTrackdir(trackdir)) ToggleBit(trackdir, 0);
/* We may end up with the current gap exceeding the signal density so fix that if needed. */
if (!remove && minimise_gaps && signal_ctr > last_used_ctr + signal_density && last_suitable_tile != INVALID_TILE) {
build_signal(last_suitable_tile, last_suitable_trackdir, false);
return had_success ? total_cost : last_error;
@@ -26,6 +26,9 @@
#include <list>
#include <map>
const uint TILE_AXIAL_DISTANCE = 192; // Logical length of the tile in any DiagDirection used in vehicle movement.
const uint TILE_CORNER_DISTANCE = 128; // Logical length of the tile corner crossing in any non-diagonal direction used in vehicle movement.
/** Vehicle status bits in #Vehicle::vehstatus. */
enum VehStatus {
VS_HIDDEN = 0x01, ///< Vehicle is not visible.
@@ -426,7 +429,7 @@ public:
*/
inline uint GetAdvanceDistance()
return (this->direction & 1) ? 192 : 256;
return (this->direction & 1) ? TILE_AXIAL_DISTANCE : TILE_CORNER_DISTANCE * 2;
Status change: