Extend station bridge above flags for more than 8 station gfx values

docs/newgrf-additions.html

@@ -201,18 +201,38 @@
 	<h3 id="a0stations"><a href="https://newgrf-specs.tt-wiki.net/wiki/Action0/Stations">Action 0 - Stations</a></h3>
 	<h4 id="station_min_bridge_height"><a href="https://newgrf-specs.tt-wiki.net/wiki/Action0/Stations#Minimum_bridge_height_.281B.29">Minimum bridge height (1B, or mappable property: station_min_bridge_height)</a></h4>
 	<p>This property allows building bridges over stations.<br />
-	The bridge height property defines minimum clearances required for a bridge for each of the 8 station layouts (or 0 to not allow any bridge). Values are given in height level units (1 level == 8px).<br />
+	The bridge height property defines minimum clearances required for a bridge for each of the station layouts (or 0 to not allow any bridge). Values are given in height level units (1 level == 8px).<br />
-	Each height value is 1 byte, the total property length is 8 bytes.
+	</p>
+
+	<p>Fixed length of 8 values:<br />
+	Each height value is 1 byte, the number of values (one for each station layout) is 8, the total property length is 8 bytes.
 	</p>
 	<p>This is indicated by the feature name: <font face="monospace">action0_station_prop1B</font>, version 1</p>
+
+	<p>Variable length:<br />
+	Each height value is 1 byte, the number of values (one for each station layout) is variable, the total property length is variable.<br />
+	The mappable property must be used, not variable 1B. The number of values is determined from the length.
+	</p>
+	<p>This is indicated by the feature name: <font face="monospace">action0_station_min_bridge_height</font>, version 1</p>
+
 	<h4 id="station_disallowed_bridge_pillars">Disallowed bridge pillars (mappable property: station_disallowed_bridge_pillars)</h4>
 	<p>This property describes which bridge pillars are not allowed on the station tile.<br />
-	It consists of 8 pillar flags, for each of the 8 station layouts.<br />
+	It consists of N pillar flags, for each of the N station layouts.<br />
-	Each set of flags is 1 byte, the total property length is 8 bytes.<br />
+	Each set of flags is 1 byte.<br />
 	Each set of flags has the format described in the bridge_pillar_flags property section, below.
 	</p>
+
+	<p>Fixed length of 8 values:<br />
+	Each set of flags is 1 byte, the number of values (one for each station layout) is 8, the total property length is 8 bytes.
+	</p>
 	<p>This is indicated by the feature name: <font face="monospace">action0_station_disallowed_bridge_pillars</font>, version 1</p>
 
+	<p>Variable length:<br />
+	Each set of flags is 1 byte, the number of values (one for each station layout) is variable, the total property length is variable.<br />
+	The number of values is determined from the length.
+	</p>
+	<p>This is indicated by the feature name: <font face="monospace">action0_station_disallowed_bridge_pillars</font>, version 2</p>
+
 	<br />
 	The 8 station layouts are described below.
 	<table>

src/newgrf.cpp

@@ -2148,23 +2148,33 @@ static ChangeInfoResult StationChangeInfo(uint stid, int numinfo, int prop, cons
 				break;
 			}
 
-			case A0RPI_STATION_MIN_BRIDGE_HEIGHT:
+			case A0RPI_STATION_MIN_BRIDGE_HEIGHT: {
-				if (MappedPropertyLengthMismatch(buf, 8, mapping_entry)) break;
+				SetBit(statspec->internal_flags, SSIF_BRIDGE_HEIGHTS_SET);
-				[[fallthrough]];
+				size_t length = buf->ReadExtendedByte();
+				if (statspec->bridge_above_flags.size() < length) statspec->bridge_above_flags.resize(length);
+				for (size_t i = 0; i < length; i++) {
+					statspec->bridge_above_flags[i].height = buf->ReadByte();
+				}
+				break;
+			}
+
 			case 0x1B: // Minimum height for a bridge above
 				SetBit(statspec->internal_flags, SSIF_BRIDGE_HEIGHTS_SET);
+				if (statspec->bridge_above_flags.size() < 8) statspec->bridge_above_flags.resize(8);
 				for (uint i = 0; i < 8; i++) {
-					statspec->bridge_height[i] = buf->ReadByte();
+					statspec->bridge_above_flags[i].height = buf->ReadByte();
 				}
 				break;
 
-			case A0RPI_STATION_DISALLOWED_BRIDGE_PILLARS:
+			case A0RPI_STATION_DISALLOWED_BRIDGE_PILLARS: {
-				if (MappedPropertyLengthMismatch(buf, 8, mapping_entry)) break;
 				SetBit(statspec->internal_flags, SSIF_BRIDGE_DISALLOWED_PILLARS_SET);
-				for (uint i = 0; i < 8; i++) {
+				size_t length = buf->ReadExtendedByte();
-					statspec->bridge_disallowed_pillars[i] = buf->ReadByte();
+				if (statspec->bridge_above_flags.size() < length) statspec->bridge_above_flags.resize(length);
+				for (size_t i = 0; i < length; i++) {
+					statspec->bridge_above_flags[i].disallowed_pillars = buf->ReadByte();
 				}
 				break;
+			}
 
 			case 0x1C: // Station Name
 				AddStringForMapping(buf->ReadWord(), &statspec->name);

src/newgrf_extension.cpp

@@ -22,7 +22,8 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("feature_id_mapping", 2),
 	GRFFeatureInfo("action5_type_id_mapping", 2),
 	GRFFeatureInfo("action0_station_prop1B", 1),
-	GRFFeatureInfo("action0_station_disallowed_bridge_pillars", 1),
+	GRFFeatureInfo("action0_station_min_bridge_height", 1),
+	GRFFeatureInfo("action0_station_disallowed_bridge_pillars", 2),
 	GRFFeatureInfo("varaction2_station_var42", 1),
 	GRFFeatureInfo("varaction2_station_station_nearby_info_v2", 1),
 	GRFFeatureInfo("more_bridge_types", 1),

src/newgrf_station.h

@@ -177,8 +177,11 @@ struct StationSpec : NewGRFSpecBase<StationClassID> {
 
 	uint8_t flags; ///< Bitmask of flags, bit 0: use different sprite set; bit 1: divide cargo about by station size
 
-	uint8_t bridge_height[8]; ///< Minimum height for a bridge above, 0 for none
+	struct BridgeAboveFlags {
-	uint8_t bridge_disallowed_pillars[8]; ///< Disallowed pillar flags for a bridge above
+		uint8_t height = UINT8_MAX;     ///< Minimum height for a bridge above, 0 for none
+		uint8_t disallowed_pillars = 0; ///< Disallowed pillar flags for a bridge above
+	};
+	std::vector<BridgeAboveFlags> bridge_above_flags; ///< List of bridge above flags.
 
 	enum class TileFlags : uint8_t {
 		None = 0,
@@ -194,6 +197,12 @@ struct StationSpec : NewGRFSpecBase<StationClassID> {
 
 	/** Custom platform layouts, keyed by platform and length combined. */
 	std::unordered_map<uint16_t, std::vector<uint8_t>> layouts;
+
+	BridgeAboveFlags GetBridgeAboveFlags(uint gfx) const
+	{
+		if (gfx < this->bridge_above_flags.size()) return this->bridge_above_flags[gfx];
+		return {};
+	}
 };
 DECLARE_ENUM_AS_BIT_SET(StationSpec::TileFlags);
 

src/station_cmd.cpp

@@ -924,15 +924,14 @@ CommandCost CheckBuildableTile(TileIndex tile, uint invalid_dirs, int &allowed_z
 CommandCost IsRailStationBridgeAboveOk(TileIndex tile, const StationSpec *statspec, uint8_t layout, TileIndex northern_bridge_end, TileIndex southern_bridge_end, int bridge_height,
 		BridgeType bridge_type, TransportType bridge_transport_type)
 {
-	assert(layout < 8);
+	if (statspec != nullptr && HasBit(statspec->internal_flags, SSIF_BRIDGE_HEIGHTS_SET)) {
-
+		int height_above = statspec->GetBridgeAboveFlags(layout).height;
-	if (statspec && HasBit(statspec->internal_flags, SSIF_BRIDGE_HEIGHTS_SET)) {
+		if (height_above == 0) return CommandCost(INVALID_STRING_ID);
-		if (statspec->bridge_height[layout] == 0) return CommandCost(INVALID_STRING_ID);
+		if (GetTileMaxZ(tile) + height_above > bridge_height) {
-		if (GetTileMaxZ(tile) + statspec->bridge_height[layout] > bridge_height) {
 			return CommandCost(STR_ERROR_BRIDGE_TOO_LOW_FOR_STATION);
 		}
 	} else if (!statspec) {
-		// default stations/waypoints
+		/* Default stations/waypoints */
 		const int height = layout < 4 ? 2 : 5;
 		if (GetTileMaxZ(tile) + height > bridge_height) return CommandCost(STR_ERROR_BRIDGE_TOO_LOW_FOR_STATION);
 	} else {
@@ -940,18 +939,22 @@ CommandCost IsRailStationBridgeAboveOk(TileIndex tile, const StationSpec *statsp
 	}
 
 	BridgePiecePillarFlags disallowed_pillar_flags;
-	if (statspec && HasBit(statspec->internal_flags, SSIF_BRIDGE_DISALLOWED_PILLARS_SET)) {
+	if (statspec != nullptr && HasBit(statspec->internal_flags, SSIF_BRIDGE_DISALLOWED_PILLARS_SET)) {
-		// pillar flags set by NewGRF
+		/* Pillar flags set by NewGRF */
-		disallowed_pillar_flags = (BridgePiecePillarFlags) statspec->bridge_disallowed_pillars[layout];
+		disallowed_pillar_flags = (BridgePiecePillarFlags) statspec->GetBridgeAboveFlags(layout).disallowed_pillars;
 	} else if (!statspec) {
-		// default stations/waypoints
+		/* Default stations/waypoints */
+		if (layout < 8) {
 			static const uint8_t st_flags[8] = { 0x50, 0xA0, 0x50, 0xA0, 0x50 | 0x26, 0xA0 | 0x1C, 0x50 | 0x89, 0xA0 | 0x43 };
 			disallowed_pillar_flags = (BridgePiecePillarFlags) st_flags[layout];
+		} else {
+			disallowed_pillar_flags = (BridgePiecePillarFlags) 0;
+		}
 	} else if ((GetStationTileFlags(layout, statspec) & StationSpec::TileFlags::Blocked) == StationSpec::TileFlags::Blocked) {
-		// non-track station tiles
+		/* Non-track station tiles */
 		disallowed_pillar_flags = (BridgePiecePillarFlags) 0;
 	} else {
-		// tracked station tiles
+		/* Tracked station tiles */
 		const Axis axis = HasBit(layout, 0) ? AXIS_Y : AXIS_X;
 		disallowed_pillar_flags = (BridgePiecePillarFlags) (axis == AXIS_X ? 0x50 : 0xA0);
 	}