Refactor import/export to support multiple ride rating update states

src/openrct2/park/ParkFile.cpp

@@ -536,7 +536,25 @@ namespace OpenRCT2
                 cs.ReadWrite(gGrassSceneryTileLoopPosition);
                 cs.ReadWrite(gWidePathTileLoopPosition);
 
-                ReadWriteRideRatingCalculationData(cs, gRideRatingUpdateState);
+                auto& rideRatings = RideRatingGetUpdateStates();
+                if (os.GetHeader().TargetVersion >= 21)
+                {
+                    cs.ReadWriteArray(rideRatings, [this, &cs](RideRatingUpdateState& calcData) {
+                        ReadWriteRideRatingCalculationData(cs, calcData);
+                        return true;
+                    });
+                }
+                else
+                {
+                    // Only single state was stored prior to version 20.
+                    if (os.GetMode() == OrcaStream::Mode::READING)
+                    {
+                        // Since we read only one state ensure the rest is reset.
+                        RideRatingResetUpdateStates();
+                    }
+                    auto& rideRatingUpdateState = rideRatings[0];
+                    ReadWriteRideRatingCalculationData(cs, rideRatingUpdateState);
+                }
 
                 if (os.GetHeader().TargetVersion >= 14)
                 {

src/openrct2/rct2/S6Importer.cpp

@@ -1097,7 +1097,10 @@ namespace RCT2
         void ImportRideRatingsCalcData()
         {
             const auto& src = _s6.RideRatingsCalcData;
-            auto& dst = gRideRatingUpdateState;
+            // S6 has only one state, ensure we reset all states before reading the first one.
+            RideRatingResetUpdateStates();
+            auto& rideRatingStates = RideRatingGetUpdateStates();
+            auto& dst = rideRatingStates[0];
             dst = {};
             dst.Proximity = { src.ProximityX, src.ProximityY, src.ProximityZ };
             dst.ProximityStart = { src.ProximityStartX, src.ProximityStartY, src.ProximityStartZ };

src/openrct2/ride/RideRatings.cpp

@@ -77,7 +77,7 @@ struct ShelteredEights
     uint8_t TotalShelteredEighths;
 };
 
-RideRatingUpdateState gRideRatingUpdateState;
+static RideRatingUpdateStates gRideRatingUpdateStates;
 
 static void ride_ratings_update_state(RideRatingUpdateState& state);
 static void ride_ratings_update_state_0(RideRatingUpdateState& state);
@@ -93,6 +93,25 @@ static void ride_ratings_score_close_proximity(RideRatingUpdateState& state, Til
 
 static void ride_ratings_add(RatingTuple* rating, int32_t excitement, int32_t intensity, int32_t nausea);
 
+RideRatingUpdateStates& RideRatingGetUpdateStates()
+{
+    return gRideRatingUpdateStates;
+}
+
+void RideRatingResetUpdateStates()
+{
+    RideRatingUpdateState nullState{};
+    nullState.State = RIDE_RATINGS_STATE_FIND_NEXT_RIDE;
+
+    std::fill(gRideRatingUpdateStates.begin(), gRideRatingUpdateStates.end(), nullState);
+}
+
+RideRatingUpdateState& RideRatingGetUpdateState(size_t index)
+{
+    Guard::IndexInRange(index, gRideRatingUpdateStates);
+    return gRideRatingUpdateStates[index];
+}
+
 /**
  * This is a small hack function to keep calling the ride rating processor until
  * the given ride's ratings have been calculated. Whatever is currently being
@@ -126,7 +145,7 @@ void RideRatingsUpdateAll()
 
     // NOTE: With the new save format more than one ride can be updated at once, but this has not yet been implemented.
     // The SV6 format could store only a single state.
-    ride_ratings_update_state(gRideRatingUpdateState);
+    ride_ratings_update_state(gRideRatingUpdateStates[0]);
 }
 
 static void ride_ratings_update_state(RideRatingUpdateState& state)

src/openrct2/ride/RideRatings.h

@@ -54,7 +54,12 @@ struct RideRatingUpdateState
     uint16_t StationFlags;
 };
 
-extern RideRatingUpdateState gRideRatingUpdateState;
+static constexpr size_t RideRatingMaxUpdateStates = 4;
+
+using RideRatingUpdateStates = std::array<RideRatingUpdateState, RideRatingMaxUpdateStates>;
+
+RideRatingUpdateStates& RideRatingGetUpdateStates();
+void RideRatingResetUpdateStates();
 
 void RideRatingsUpdateRide(const Ride& ride);
 void RideRatingsUpdateAll();