Paper/patches/server/0662-Add-missing-structure-set-seed-configs.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 13 Jan 2022 23:05:53 -0800
Subject: [PATCH] Add missing structure set seed configs

The 4 missing structure set seed configs are strongholds, mineshafts,
buried treasure, and ancient cities.

Strongholds use a ring placement scheme which isn't random so they
utilize the world seed by default, this adds a config to override it
for just generating the ring positions.

Mineshafts and Buried Treasure structure sets are special cases
where the "salt" that can be defined for them via datapacks has 0
effect because the difference between the spacing and separation is 1
which is used as the upper bound in the random with salt. So the random
always returns the same int (0) so the salt has no effect. This adds
seeds/salts to the frequency reducer which has a similar effect.

Co-authored-by: William Blake Galbreath <blake.galbreath@gmail.com>

diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
index c5dd3aac54aa5936da4bd9f54f0e76ecf8141d27..102de569415ef011dacdca9a6ea8134d0ef62454 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGenerator.java
@@ -573,7 +573,7 @@ public abstract class ChunkGenerator {
                 }
             }
 
-            if (structureplacement.isStructureChunk(placementCalculator, chunkcoordintpair.x, chunkcoordintpair.z)) {
+            if (structureplacement.isStructureChunk(placementCalculator, chunkcoordintpair.x, chunkcoordintpair.z, structureplacement instanceof net.minecraft.world.level.chunk.ChunkGeneratorStructureState.KeyedRandomSpreadStructurePlacement keyed ? keyed.key : null)) { // Paper - Add missing structure set seed configs
                 if (list.size() == 1) {
                     this.tryGenerateStructure((StructureSet.StructureSelectionEntry) list.get(0), structureAccessor, registryManager, randomstate, structureTemplateManager, placementCalculator.getLevelSeed(), chunk, chunkcoordintpair, sectionposition);
                 } else {
diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkGeneratorStructureState.java b/src/main/java/net/minecraft/world/level/chunk/ChunkGeneratorStructureState.java
index e6c59f986ae89022bd76463209dfa550a3d4fb59..a6b6e5ea191c0e2cd7a2e4f01b89d8af40a83c1b 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkGeneratorStructureState.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkGeneratorStructureState.java
@@ -50,13 +50,14 @@ public class ChunkGeneratorStructureState {
     private final Map<ConcentricRingsStructurePlacement, CompletableFuture<List<ChunkPos>>> ringPositions = new Object2ObjectArrayMap();
     private boolean hasGeneratedPositions;
     private final List<Holder<StructureSet>> possibleStructureSets;
+    public final SpigotWorldConfig conf; // Paper - Add missing structure set seed configs
 
     public static ChunkGeneratorStructureState createForFlat(RandomState randomstate, long i, BiomeSource worldchunkmanager, Stream<Holder<StructureSet>> stream, SpigotWorldConfig conf) { // Spigot
         List<Holder<StructureSet>> list = stream.filter((holder) -> {
             return ChunkGeneratorStructureState.hasBiomesForStructureSet((StructureSet) holder.value(), worldchunkmanager);
         }).toList();
 
-        return new ChunkGeneratorStructureState(randomstate, worldchunkmanager, i, 0L, ChunkGeneratorStructureState.injectSpigot(list, conf)); // Spigot
+        return new ChunkGeneratorStructureState(randomstate, worldchunkmanager, i, 0L, ChunkGeneratorStructureState.injectSpigot(list, conf), conf); // Spigot
     }
 
     public static ChunkGeneratorStructureState createForNormal(RandomState randomstate, long i, BiomeSource worldchunkmanager, HolderLookup<StructureSet> holderlookup, SpigotWorldConfig conf) { // Spigot
@@ -64,14 +65,24 @@ public class ChunkGeneratorStructureState {
             return ChunkGeneratorStructureState.hasBiomesForStructureSet((StructureSet) holder_c.value(), worldchunkmanager);
         }).collect(Collectors.toUnmodifiableList());
 
-        return new ChunkGeneratorStructureState(randomstate, worldchunkmanager, i, i, ChunkGeneratorStructureState.injectSpigot(list, conf)); // Spigot
+        return new ChunkGeneratorStructureState(randomstate, worldchunkmanager, i, i, ChunkGeneratorStructureState.injectSpigot(list, conf), conf); // Spigot
     }
+    // Paper start - Add missing structure set seed configs; horrible hack because spigot creates a ton of direct Holders which lose track of the identifying key
+    public static final class KeyedRandomSpreadStructurePlacement extends RandomSpreadStructurePlacement {
+        public final net.minecraft.resources.ResourceKey<StructureSet> key;
+        public KeyedRandomSpreadStructurePlacement(net.minecraft.resources.ResourceKey<StructureSet> key, net.minecraft.core.Vec3i locateOffset, FrequencyReductionMethod frequencyReductionMethod, float frequency, int salt, java.util.Optional<StructurePlacement.ExclusionZone> exclusionZone, int spacing, int separation, net.minecraft.world.level.levelgen.structure.placement.RandomSpreadType spreadType) {
+            super(locateOffset, frequencyReductionMethod, frequency, salt, exclusionZone, spacing, separation, spreadType);
+            this.key = key;
+        }
+    }
+    // Paper end - Add missing structure set seed configs
 
     // Spigot start
     private static List<Holder<StructureSet>> injectSpigot(List<Holder<StructureSet>> list, SpigotWorldConfig conf) {
         return list.stream().map((holder) -> {
             StructureSet structureset = holder.value();
-            if (structureset.placement() instanceof RandomSpreadStructurePlacement randomConfig) {
+            final Holder<StructureSet> newHolder; // Paper - Add missing structure set seed configs
+            if (structureset.placement() instanceof RandomSpreadStructurePlacement randomConfig && holder.unwrapKey().orElseThrow().location().getNamespace().equals(net.minecraft.resources.ResourceLocation.DEFAULT_NAMESPACE)) { // Paper - Add missing structure set seed configs; check namespace cause datapacks could add structure sets with the same path
                 String name = holder.unwrapKey().orElseThrow().location().getPath();
                 int seed = randomConfig.salt;
 
@@ -118,11 +129,27 @@ public class ChunkGeneratorStructureState {
                     case "villages":
                         seed = conf.villageSeed;
                         break;
+                    // Paper start - Add missing structure set seed configs
+                    case "ancient_cities":
+                        seed = conf.ancientCitySeed;
+                        break;
+                    case "trail_ruins":
+                        seed = conf.trailRuinsSeed;
+                        break;
+                    case "trial_chambers":
+                        seed = conf.trialChambersSeed;
+                        break;
+                    // Paper end - Add missing structure set seed configs
                 }
 
-                structureset = new StructureSet(structureset.structures(), new RandomSpreadStructurePlacement(randomConfig.locateOffset, randomConfig.frequencyReductionMethod, randomConfig.frequency, seed, randomConfig.exclusionZone, randomConfig.spacing(), randomConfig.separation(), randomConfig.spreadType()));
+            // Paper start - Add missing structure set seed configs
+                structureset = new StructureSet(structureset.structures(), new KeyedRandomSpreadStructurePlacement(holder.unwrapKey().orElseThrow(), randomConfig.locateOffset, randomConfig.frequencyReductionMethod, randomConfig.frequency, seed, randomConfig.exclusionZone, randomConfig.spacing(), randomConfig.separation(), randomConfig.spreadType()));
+                newHolder = Holder.direct(structureset); // I really wish we didn't have to do this here
+            } else {
+                newHolder = holder;
             }
-            return Holder.direct(structureset);
+            return newHolder;
+            // Paper end - Add missing structure set seed configs
         }).collect(Collectors.toUnmodifiableList());
     }
     // Spigot end
@@ -139,12 +166,13 @@ public class ChunkGeneratorStructureState {
         return stream.anyMatch(set::contains);
     }
 
-    private ChunkGeneratorStructureState(RandomState noiseConfig, BiomeSource biomeSource, long structureSeed, long concentricRingSeed, List<Holder<StructureSet>> structureSets) {
+    private ChunkGeneratorStructureState(RandomState noiseConfig, BiomeSource biomeSource, long structureSeed, long concentricRingSeed, List<Holder<StructureSet>> structureSets, SpigotWorldConfig conf) { // Paper - Add missing structure set seed configs
         this.randomState = noiseConfig;
         this.levelSeed = structureSeed;
         this.biomeSource = biomeSource;
         this.concentricRingsSeed = concentricRingSeed;
         this.possibleStructureSets = structureSets;
+        this.conf = conf; // Paper - Add missing structure set seed configs
     }
 
     public List<Holder<StructureSet>> possibleStructureSets() {
@@ -198,7 +226,13 @@ public class ChunkGeneratorStructureState {
             HolderSet<Biome> holderset = placement.preferredBiomes();
             RandomSource randomsource = RandomSource.create();
 
+            // Paper start - Add missing structure set seed configs
+            if (this.conf.strongholdSeed != null && structureSetEntry.is(net.minecraft.world.level.levelgen.structure.BuiltinStructureSets.STRONGHOLDS)) {
+                randomsource.setSeed(this.conf.strongholdSeed);
+            } else {
+            // Paper end - Add missing structure set seed configs
             randomsource.setSeed(this.concentricRingsSeed);
+            } // Paper - Add missing structure set seed configs
             double d0 = randomsource.nextDouble() * Math.PI * 2.0D;
             int l = 0;
             int i1 = 0;
@@ -275,7 +309,7 @@ public class ChunkGeneratorStructureState {
 
         for (int l = centerChunkX - chunkCount; l <= centerChunkX + chunkCount; ++l) {
             for (int i1 = centerChunkZ - chunkCount; i1 <= centerChunkZ + chunkCount; ++i1) {
-                if (structureplacement.isStructureChunk(this, l, i1)) {
+                if (structureplacement.isStructureChunk(this, l, i1, structureplacement instanceof KeyedRandomSpreadStructurePlacement keyed ? keyed.key : null)) { // Paper - Add missing structure set seed configs
                     return true;
                 }
             }
diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java b/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java
index aae73586265593ee7830fb8dd5c2e3d7560057f0..c6181e14d85d454506534f9bbe856156c0d4a062 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/StructureCheck.java
@@ -74,6 +74,20 @@ public class StructureCheck {
         this.fixerUpper = dataFixer;
     }
 
+    // Paper start - add missing structure salt configs
+    @Nullable
+    private Integer getSaltOverride(Structure type) {
+        if (this.heightAccessor instanceof net.minecraft.server.level.ServerLevel serverLevel) {
+            if (type instanceof net.minecraft.world.level.levelgen.structure.structures.MineshaftStructure) {
+                return serverLevel.spigotConfig.mineshaftSeed;
+            } else if (type instanceof net.minecraft.world.level.levelgen.structure.structures.BuriedTreasureStructure) {
+                return serverLevel.spigotConfig.buriedTreasureSeed;
+            }
+        }
+        return null;
+    }
+    // Paper end - add missing structure seed configs
+
     public StructureCheckResult checkStart(ChunkPos pos, Structure type, StructurePlacement placement, boolean skipReferencedStructures) {
         long l = pos.toLong();
         Object2IntMap<Structure> object2IntMap = this.loadedChunks.get(l);
@@ -83,7 +97,7 @@ public class StructureCheck {
             StructureCheckResult structureCheckResult = this.tryLoadFromStorage(pos, type, skipReferencedStructures, l);
             if (structureCheckResult != null) {
                 return structureCheckResult;
-            } else if (!placement.applyAdditionalChunkRestrictions(pos.x, pos.z, this.seed)) {
+            } else if (!placement.applyAdditionalChunkRestrictions(pos.x, pos.z, this.seed, this.getSaltOverride(type))) { // Paper - add missing structure seed configs
                 return StructureCheckResult.START_NOT_PRESENT;
             } else {
                 boolean bl = this.featureChecks
diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java b/src/main/java/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java
index a4c34e9415632354d33668a38d06453ada4d3c77..cbf13e4f2da6a27619e9bc9a7cd73bb6e69cad2a 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/placement/StructurePlacement.java
@@ -79,14 +79,30 @@ public abstract class StructurePlacement {
         return this.exclusionZone;
     }
 
+    @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper - Add missing structure set seed configs
     public boolean isStructureChunk(ChunkGeneratorStructureState calculator, int chunkX, int chunkZ) {
+        // Paper start - Add missing structure set seed configs
+        return this.isStructureChunk(calculator, chunkX, chunkZ, null);
+    }
+    public boolean isStructureChunk(ChunkGeneratorStructureState calculator, int chunkX, int chunkZ, @org.jetbrains.annotations.Nullable net.minecraft.resources.ResourceKey<StructureSet> structureSetKey) {
+        Integer saltOverride = null;
+        if (structureSetKey != null) {
+            if (structureSetKey == net.minecraft.world.level.levelgen.structure.BuiltinStructureSets.MINESHAFTS) {
+                saltOverride = calculator.conf.mineshaftSeed;
+            } else if (structureSetKey == net.minecraft.world.level.levelgen.structure.BuiltinStructureSets.BURIED_TREASURES) {
+                saltOverride = calculator.conf.buriedTreasureSeed;
+            }
+        }
+        // Paper end - Add missing structure set seed configs
         return this.isPlacementChunk(calculator, chunkX, chunkZ)
-            && this.applyAdditionalChunkRestrictions(chunkX, chunkZ, calculator.getLevelSeed())
+            && this.applyAdditionalChunkRestrictions(chunkX, chunkZ, calculator.getLevelSeed(), saltOverride) // Paper - Add missing structure set seed configs
             && this.applyInteractionsWithOtherStructures(calculator, chunkX, chunkZ);
     }
 
-    public boolean applyAdditionalChunkRestrictions(int chunkX, int chunkZ, long seed) {
-        return !(this.frequency < 1.0F) || this.frequencyReductionMethod.shouldGenerate(seed, this.salt, chunkX, chunkZ, this.frequency);
+    // Paper start - Add missing structure set seed configs
+    public boolean applyAdditionalChunkRestrictions(int chunkX, int chunkZ, long seed, @org.jetbrains.annotations.Nullable Integer saltOverride) {
+        return !(this.frequency < 1.0F) || this.frequencyReductionMethod.shouldGenerate(seed, this.salt, chunkX, chunkZ, this.frequency, saltOverride);
+        // Paper end - Add missing structure set seed configs
     }
 
     public boolean applyInteractionsWithOtherStructures(ChunkGeneratorStructureState calculator, int centerChunkX, int centerChunkZ) {
@@ -101,25 +117,31 @@ public abstract class StructurePlacement {
 
     public abstract StructurePlacementType<?> type();
 
-    private static boolean probabilityReducer(long seed, int salt, int chunkX, int chunkZ, float frequency) {
+    private static boolean probabilityReducer(long seed, int salt, int chunkX, int chunkZ, float frequency, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs; ignore here
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
         worldgenRandom.setLargeFeatureWithSalt(seed, salt, chunkX, chunkZ);
         return worldgenRandom.nextFloat() < frequency;
     }
 
-    private static boolean legacyProbabilityReducerWithDouble(long seed, int salt, int chunkX, int chunkZ, float frequency) {
+    private static boolean legacyProbabilityReducerWithDouble(long seed, int salt, int chunkX, int chunkZ, float frequency, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
+        if (saltOverride == null) { // Paper - Add missing structure set seed configs
         worldgenRandom.setLargeFeatureSeed(seed, chunkX, chunkZ);
+        // Paper start - Add missing structure set seed configs
+        } else {
+            worldgenRandom.setLargeFeatureWithSalt(seed, chunkX, chunkZ, saltOverride);
+        }
+        // Paper end - Add missing structure set seed configs
         return worldgenRandom.nextDouble() < (double)frequency;
     }
 
-    private static boolean legacyArbitrarySaltProbabilityReducer(long seed, int salt, int chunkX, int chunkZ, float frequency) {
+    private static boolean legacyArbitrarySaltProbabilityReducer(long seed, int salt, int chunkX, int chunkZ, float frequency, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
-        worldgenRandom.setLargeFeatureWithSalt(seed, chunkX, chunkZ, 10387320);
+        worldgenRandom.setLargeFeatureWithSalt(seed, chunkX, chunkZ, saltOverride != null ? saltOverride : HIGHLY_ARBITRARY_RANDOM_SALT); // Paper - Add missing structure set seed configs
         return worldgenRandom.nextFloat() < frequency;
     }
 
-    private static boolean legacyPillagerOutpostReducer(long seed, int salt, int chunkX, int chunkZ, float frequency) {
+    private static boolean legacyPillagerOutpostReducer(long seed, int salt, int chunkX, int chunkZ, float frequency, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs; ignore here
         int i = chunkX >> 4;
         int j = chunkZ >> 4;
         WorldgenRandom worldgenRandom = new WorldgenRandom(new LegacyRandomSource(0L));
@@ -147,7 +169,7 @@ public abstract class StructurePlacement {
 
     @FunctionalInterface
     public interface FrequencyReducer {
-        boolean shouldGenerate(long seed, int salt, int chunkX, int chunkZ, float chance);
+        boolean shouldGenerate(long seed, int salt, int chunkX, int chunkZ, float chance, @org.jetbrains.annotations.Nullable Integer saltOverride); // Paper - Add missing structure set seed configs
     }
 
     public static enum FrequencyReductionMethod implements StringRepresentable {
@@ -167,8 +189,8 @@ public abstract class StructurePlacement {
             this.reducer = generationPredicate;
         }
 
-        public boolean shouldGenerate(long seed, int salt, int chunkX, int chunkZ, float chance) {
-            return this.reducer.shouldGenerate(seed, salt, chunkX, chunkZ, chance);
+        public boolean shouldGenerate(long seed, int salt, int chunkX, int chunkZ, float chance, @org.jetbrains.annotations.Nullable Integer saltOverride) { // Paper - Add missing structure set seed configs
+            return this.reducer.shouldGenerate(seed, salt, chunkX, chunkZ, chance, saltOverride); // Paper - Add missing structure set seed configs
         }
 
         @Override
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index e76f96a5c48d1eda2f9bbb3e11dd79f23f9ab75c..2b263246135c85aa225120519e9702a628773935 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -322,6 +322,18 @@ public class SpigotWorldConfig
     public int mansionSeed;
     public int fossilSeed;
     public int portalSeed;
+    // Paper start - add missing structure set configs
+    public int ancientCitySeed;
+    public int trailRuinsSeed;
+    public int trialChambersSeed;
+    public int buriedTreasureSeed;
+    public Integer mineshaftSeed;
+    public Long strongholdSeed;
+    private <N extends Number> N getSeed(String path, java.util.function.Function<String, N> toNumberFunc) {
+        final String value = this.getString(path, "default");
+        return org.apache.commons.lang3.math.NumberUtils.isParsable(value) ? toNumberFunc.apply(value) : null;
+    }
+    // Paper end
     private void initWorldGenSeeds()
     {
         this.villageSeed = this.getInt( "seed-village", 10387312 );
@@ -339,6 +351,14 @@ public class SpigotWorldConfig
         this.mansionSeed = this.getInt( "seed-mansion", 10387319 );
         this.fossilSeed = this.getInt( "seed-fossil", 14357921 );
         this.portalSeed = this.getInt( "seed-portal", 34222645 );
+        // Paper start - add missing structure set configs
+        this.ancientCitySeed = this.getInt("seed-ancientcity", 20083232);
+        this.trailRuinsSeed = this.getInt("seed-trailruins", 83469867);
+        this.trialChambersSeed = this.getInt("seed-trialchambers", 94251327);
+        this.buriedTreasureSeed = this.getInt("seed-buriedtreasure", 10387320); // StructurePlacement#HIGHLY_ARBITRARY_RANDOM_SALT
+        this.mineshaftSeed = this.getSeed("seed-mineshaft", Integer::parseInt);
+        this.strongholdSeed = this.getSeed("seed-stronghold", Long::parseLong);
+        // Paper end
         this.log( "Custom Map Seeds:  Village: " + this.villageSeed + " Desert: " + this.desertSeed + " Igloo: " + this.iglooSeed + " Jungle: " + this.jungleSeed + " Swamp: " + this.swampSeed + " Monument: " + this.monumentSeed
                 + " Ocean: " + this.oceanSeed + " Shipwreck: " + this.shipwreckSeed + " End City: " + this.endCitySeed + " Slime: " + this.slimeSeed + " Nether: " + this.netherSeed + " Mansion: " + this.mansionSeed + " Fossil: " + this.fossilSeed + " Portal: " + this.portalSeed );
     }
diff --git a/src/test/java/io/papermc/paper/world/structure/StructureSeedConfigTest.java b/src/test/java/io/papermc/paper/world/structure/StructureSeedConfigTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..9061ad5868ac18e76ae4d51d23d101c5e25f7f52
--- /dev/null
+++ b/src/test/java/io/papermc/paper/world/structure/StructureSeedConfigTest.java
@@ -0,0 +1,75 @@
+package io.papermc.paper.world.structure;
+
+import io.papermc.paper.configuration.PaperConfigurations;
+import java.io.File;
+import java.lang.reflect.Field;
+import net.minecraft.core.Registry;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.level.levelgen.structure.BuiltinStructureSets;
+import net.minecraft.world.level.levelgen.structure.StructureSet;
+import net.minecraft.world.level.levelgen.structure.placement.StructurePlacement;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.support.AbstractTestingBase;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.Test;
+import org.spigotmc.SpigotConfig;
+import org.spigotmc.SpigotWorldConfig;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StructureSeedConfigTest extends AbstractTestingBase {
+
+    @Test
+    public void checkStructureSeedDefaults() throws ReflectiveOperationException {
+        SpigotConfig.config = new YamlConfiguration() {
+            @Override
+            public void save(final @NotNull File file) {
+                // no-op
+            }
+        };
+        final SpigotWorldConfig config = PaperConfigurations.SPIGOT_WORLD_DEFAULTS.get();
+
+
+        final Registry<StructureSet> structureSets = AbstractTestingBase.REGISTRY_CUSTOM.registryOrThrow(Registries.STRUCTURE_SET);
+        for (final ResourceKey<StructureSet> setKey : structureSets.registryKeySet()) {
+            assertEquals(ResourceLocation.DEFAULT_NAMESPACE, setKey.location().getNamespace());
+            final StructureSet set = structureSets.getOrThrow(setKey);
+            if (setKey == BuiltinStructureSets.STRONGHOLDS) { // special case due to seed matching world seed
+                assertEquals(0, set.placement().salt);
+                continue;
+            }
+            int salt = switch (setKey.location().getPath()) {
+                case "villages" -> config.villageSeed;
+                case "desert_pyramids" -> config.desertSeed;
+                case "igloos" -> config.iglooSeed;
+                case "jungle_temples" -> config.jungleSeed;
+                case "swamp_huts" -> config.swampSeed;
+                case "pillager_outposts" -> config.outpostSeed;
+                case "ocean_monuments" -> config.monumentSeed;
+                case "woodland_mansions" -> config.mansionSeed;
+                case "buried_treasures" -> config.buriedTreasureSeed;
+                case "mineshafts" -> config.mineshaftSeed == null ? 0 : config.mineshaftSeed; // mineshaft seed is set differently
+                case "ruined_portals" -> config.portalSeed;
+                case "shipwrecks" -> config.shipwreckSeed;
+                case "ocean_ruins" -> config.oceanSeed;
+                case "nether_complexes" -> config.netherSeed;
+                case "nether_fossils" -> config.fossilSeed;
+                case "end_cities" -> config.endCitySeed;
+                case "ancient_cities" -> config.ancientCitySeed;
+                case "trail_ruins" -> config.trailRuinsSeed;
+                case "trial_chambers" -> config.trialChambersSeed;
+                default -> throw new AssertionError("Missing structure set seed in SpigotWorldConfig for " + setKey);
+            };
+            if (setKey == BuiltinStructureSets.BURIED_TREASURES) {
+                final Field field = StructurePlacement.class.getDeclaredField("HIGHLY_ARBITRARY_RANDOM_SALT");
+                field.trySetAccessible();
+                assertEquals(0, set.placement().salt);
+                assertEquals(field.get(null), salt, "Mismatched default seed for " + setKey + ". Should be " + field.get(null));
+                continue;
+            }
+            assertEquals(set.placement().salt, salt, "Mismatched default seed for " + setKey + ". Should be " + set.placement().salt);
+        }
+    }
+}