Move conversion of station object to TD4/6 import/export

src/openrct2/actions/TrackDesignAction.cpp

@@ -241,8 +241,7 @@ GameActions::Result TrackDesignAction::Execute() const
     ride->lifecycle_flags |= RIDE_LIFECYCLE_NOT_CUSTOM_DESIGN;
     ride->colour_scheme_type = _td.colour_scheme;
 
-    auto stationIdentifier = GetStationIdentifierFromStyle(_td.entrance_style);
-    ride->entrance_style = objManager.GetLoadedObjectEntryIndex(stationIdentifier);
+    ride->entrance_style = objManager.GetLoadedObjectEntryIndex(_td.StationObjectIdentifier);
     if (ride->entrance_style == OBJECT_ENTRY_INDEX_NULL)
     {
         ride->entrance_style = gLastEntranceStyle;

src/openrct2/rct1/T4Importer.cpp

@@ -204,6 +204,7 @@ namespace RCT1
                 td->vehicle_colours[i] = td->vehicle_colours[0];
             }
 
+            td->StationObjectIdentifier = GetStationIdentifierFromStyle(RCT12_STATION_STYLE_PLAIN);
             td->depart_flags = td4Base.DepartFlags;
             td->number_of_trains = td4Base.NumberOfTrains;
             td->number_of_cars_per_train = td4Base.NumberOfCarsPerTrain;

src/openrct2/rct12/RCT12.cpp

@@ -769,7 +769,7 @@ std::string_view GetStationIdentifierFromStyle(uint8_t style)
     {
         return _stationStyles[style];
     }
-    return {};
+    return _stationStyles[RCT12_STATION_STYLE_INVISIBLE];
 }
 
 uint8_t GetStationStyleFromIdentifier(u8string_view identifier)

src/openrct2/rct2/T6Exporter.cpp

@@ -63,7 +63,8 @@ namespace RCT2
             tempStream.WriteValue<uint8_t>(_trackDesign->vehicle_colours[i].Trim);
         }
         tempStream.WriteValue<uint8_t>(0);
-        tempStream.WriteValue<uint8_t>(_trackDesign->entrance_style);
+        auto entranceStyle = GetStationStyleFromIdentifier(_trackDesign->StationObjectIdentifier);
+        tempStream.WriteValue<uint8_t>(entranceStyle);
         tempStream.WriteValue<uint8_t>(_trackDesign->total_air_time);
         tempStream.WriteValue<uint8_t>(_trackDesign->depart_flags);
         tempStream.WriteValue<uint8_t>(_trackDesign->number_of_trains);

src/openrct2/rct2/T6Importer.cpp

@@ -86,7 +86,7 @@ namespace RCT2
                 td->vehicle_colours[i].Trim = td6.VehicleColours[i].TrimColour;
                 td->vehicle_colours[i].Tertiary = td6.VehicleAdditionalColour[i];
             }
-            td->entrance_style = td6.EntranceStyle;
+            td->StationObjectIdentifier = GetStationIdentifierFromStyle(td6.EntranceStyle);
             td->total_air_time = td6.TotalAirTime;
             td->depart_flags = td6.DepartFlags;
             td->number_of_trains = td6.NumberOfTrains;

src/openrct2/ride/TrackDesign.cpp

@@ -82,6 +82,15 @@ static bool _trackDesignPlaceStateEntranceExitPlaced{};
 
 static void TrackDesignPreviewClearMap();
 
+static u8string_view TrackDesignGetStationObjectIdentifier(const Ride& ride)
+{
+    const auto* stationObject = ride.GetStationObject();
+    if (stationObject == nullptr)
+        return "";
+
+    return stationObject->GetIdentifier();
+}
+
 ResultWithMessage TrackDesign::CreateTrackDesign(TrackDesignState& tds, const Ride& ride)
 {
     type = ride.type;
@@ -122,7 +131,7 @@ ResultWithMessage TrackDesign::CreateTrackDesign(TrackDesignState& tds, const Ri
     lift_hill_speed = ride.lift_hill_speed;
     num_circuits = ride.num_circuits;
 
-    entrance_style = ride.GetEntranceStyle();
+    StationObjectIdentifier = TrackDesignGetStationObjectIdentifier(ride);
     max_speed = static_cast<int8_t>(ride.max_speed / 65536);
     average_speed = static_cast<int8_t>(ride.average_speed / 65536);
     ride_length = ride.GetTotalLength() / 65536;
@@ -564,7 +573,7 @@ void TrackDesign::Serialise(DataSerialiser& stream)
     stream << DS_TAG(track_flags);
     stream << DS_TAG(colour_scheme);
     stream << DS_TAG(vehicle_colours);
-    stream << DS_TAG(entrance_style);
+    stream << DS_TAG(StationObjectIdentifier);
     stream << DS_TAG(total_air_time);
     stream << DS_TAG(depart_flags);
     stream << DS_TAG(number_of_trains);
@@ -1990,8 +1999,7 @@ static bool TrackDesignPlacePreview(TrackDesignState& tds, TrackDesign* td6, mon
 
     ride->custom_name = {};
 
-    auto stationIdentifier = GetStationIdentifierFromStyle(td6->entrance_style);
-    ride->entrance_style = objManager.GetLoadedObjectEntryIndex(stationIdentifier);
+    ride->entrance_style = objManager.GetLoadedObjectEntryIndex(td6->StationObjectIdentifier);
     if (ride->entrance_style == OBJECT_ENTRY_INDEX_NULL)
     {
         ride->entrance_style = gLastEntranceStyle;

src/openrct2/ride/TrackDesign.h

@@ -126,7 +126,7 @@ struct TrackDesign
     uint8_t track_flags;
     uint8_t colour_scheme;
     std::array<VehicleColour, OpenRCT2::Limits::MaxVehicleColours> vehicle_colours;
-    uint8_t entrance_style;
+    u8string StationObjectIdentifier{};
     uint8_t total_air_time;
     uint8_t depart_flags;
     uint8_t number_of_trains;