fix deadlock when hotloading / closing engine

3.6.6

build.gradle

@@ -1,3 +1,5 @@
+import xyz.jpenilla.runpaper.task.RunServer
+
 /*
  * Iris is a World Generator for Minecraft Bukkit Servers
  * Copyright (c) 2021 Arcane Arts (Volmit Software)
@@ -30,10 +32,11 @@ plugins {
     id 'java-library'
     id "io.github.goooler.shadow" version "8.1.7"
     id "de.undercouch.download" version "5.0.1"
+    id "xyz.jpenilla.run-paper" version "2.3.1"
 }
 
 
-version '3.6.1-1.20.1-1.21.4'
+version '3.6.6-1.20.1-1.21.4'
 
 // ADD YOURSELF AS A NEW LINE IF YOU WANT YOUR OWN BUILD TASK GENERATED
 // ======================== WINDOWS =============================
@@ -53,6 +56,11 @@ registerCustomOutputTaskUnix('PixelMac', '/Users/test/Desktop/mcserver/plugins')
 registerCustomOutputTaskUnix('CrazyDev22LT', '/home/julian/Desktop/server/plugins')
 // ==============================================================
 
+def MIN_HEAP_SIZE = "2G"
+def MAX_HEAP_SIZE = "8G"
+//Valid values are: none, truecolor, indexed256, indexed16, indexed8
+def COLOR = "truecolor"
+
 def NMS_BINDINGS = Map.of(
         "v1_21_R3", "1.21.4-R0.1-SNAPSHOT",
         "v1_21_R2", "1.21.3-R0.1-SNAPSHOT",
@@ -62,21 +70,34 @@ def NMS_BINDINGS = Map.of(
         "v1_20_R2", "1.20.2-R0.1-SNAPSHOT",
         "v1_20_R1", "1.20.1-R0.1-SNAPSHOT",
 )
-def JVM_VERSION = Map.of()
-NMS_BINDINGS.each { nms ->
-    project(":nms:${nms.key}") {
+def JVM_VERSION = Map.<String, Integer>of()
+NMS_BINDINGS.forEach { key, value ->
+    project(":nms:$key") {
         apply plugin: 'java'
         apply plugin: 'com.volmit.nmstools'
 
         nmsTools {
-            it.jvm = JVM_VERSION.getOrDefault(nms.key, 21)
-            it.version = nms.value
+            it.jvm = JVM_VERSION.getOrDefault(key, 21)
+            it.version = value
         }
 
         dependencies {
             implementation project(":core")
         }
     }
+
+    tasks.register("runServer-$key", RunServer) {
+        group("servers")
+        minecraftVersion(value.split("-")[0])
+        minHeapSize(MIN_HEAP_SIZE)
+        maxHeapSize(MAX_HEAP_SIZE)
+        pluginJars(tasks.shadowJar.archiveFile)
+        javaLauncher = javaToolchains.launcherFor { it.languageVersion = JavaLanguageVersion.of(JVM_VERSION.getOrDefault(key, 21))}
+        runDirectory.convention(layout.buildDirectory.dir("run/$key"))
+        systemProperty("disable.watchdog", "")
+        systemProperty("net.kyori.ansi.colorLevel", COLOR)
+        systemProperty("com.mojang.eula.agree", true)
+    }
 }
 
 shadowJar {

core/build.gradle

@@ -62,7 +62,7 @@ dependencies {
 
     // Third Party Integrations
     compileOnly 'com.ticxo.playeranimator:PlayerAnimator:R1.2.7'
-    compileOnly 'com.nexomc:nexo:0.6.0-dev.0'
+    compileOnly 'com.nexomc:nexo:1.0.0-dev.38'
     compileOnly 'com.github.LoneDev6:api-itemsadder:3.4.1-r4'
     compileOnly 'com.github.PlaceholderAPI:placeholderapi:2.11.3'
     compileOnly 'com.github.Ssomar-Developement:SCore:4.23.10.8'

core/src/main/java/com/volmit/iris/Iris.java

@@ -32,8 +32,10 @@ import com.volmit.iris.core.nms.v1X.NMSBinding1X;
 import com.volmit.iris.core.pregenerator.LazyPregenerator;
 import com.volmit.iris.core.service.StudioSVC;
 import com.volmit.iris.core.tools.IrisToolbelt;
+import com.volmit.iris.core.tools.IrisWorldCreator;
 import com.volmit.iris.engine.EnginePanic;
 import com.volmit.iris.engine.object.IrisCompat;
+import com.volmit.iris.engine.object.IrisContextInjector;
 import com.volmit.iris.engine.object.IrisDimension;
 import com.volmit.iris.engine.object.IrisWorld;
 import com.volmit.iris.engine.platform.BukkitChunkGenerator;
@@ -101,8 +103,6 @@ import static com.volmit.iris.core.safeguard.ServerBootSFG.passedserversoftware;
 
 @SuppressWarnings("CanBeFinal")
 public class Iris extends VolmitPlugin implements Listener {
-    public static final String OVERWORLD_TAG = "31010";
-
     private static final Queue<Runnable> syncJobs = new ShurikenQueue<>();
 
     public static Iris instance;
@@ -459,9 +459,12 @@ public class Iris extends VolmitPlugin implements Listener {
         initialize("com.volmit.iris.core.service").forEach((i) -> services.put((Class<? extends IrisService>) i.getClass(), (IrisService) i));
         INMS.get();
         IO.delete(new File("iris"));
+        compat = IrisCompat.configured(getDataFile("compat.json"));
+        ServerConfigurator.configure();
+        new IrisContextInjector();
         IrisSafeguard.IrisSafeguardSystem();
         getSender().setTag(getTag());
-        compat = IrisCompat.configured(getDataFile("compat.json"));
+        IrisSafeguard.earlySplash();
         linkMultiverseCore = new MultiverseCoreLink();
         linkMythicMobs = new MythicMobsLink();
         configWatcher = new FileWatcher(getDataFile("settings.json"));
@@ -516,10 +519,10 @@ public class Iris extends VolmitPlugin implements Listener {
                 Iris.info("Loading World: %s | Generator: %s", s, generator);
 
                 Iris.info(C.LIGHT_PURPLE + "Preparing Spawn for " + s + "' using Iris:" + generator + "...");
-                new WorldCreator(s)
+                WorldCreator c = new WorldCreator(s)
                         .generator(getDefaultWorldGenerator(s, generator))
-                        .environment(IrisData.loadAnyDimension(generator).getEnvironment())
-                        .createWorld();
+                        .environment(IrisData.loadAnyDimension(generator).getEnvironment());
+                INMS.get().createWorld(c);
                 Iris.info(C.LIGHT_PURPLE + "Loaded " + s + "!");
             }
         } catch (Throwable e) {

core/src/main/java/com/volmit/iris/core/IrisSettings.java

@@ -181,6 +181,7 @@ public class IrisSettings {
         public boolean splashLogoStartup = true;
         public boolean useConsoleCustomColors = true;
         public boolean useCustomColorsIngame = true;
+        public boolean adjustVanillaHeight = false;
         public String forceMainWorld = "";
         public int spinh = -20;
         public int spins = 7;

core/src/main/java/com/volmit/iris/core/ServerConfigurator.java

@@ -28,20 +28,28 @@ import com.volmit.iris.engine.object.IrisBiomeCustom;
 import com.volmit.iris.engine.object.IrisDimension;
 import com.volmit.iris.engine.object.IrisRange;
 import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.collection.KMap;
 import com.volmit.iris.util.collection.KSet;
 import com.volmit.iris.util.format.C;
+import com.volmit.iris.util.misc.ServerProperties;
 import com.volmit.iris.util.plugin.VolmitSender;
 import com.volmit.iris.util.scheduling.J;
+import lombok.Data;
+import lombok.NonNull;
 import org.bukkit.Bukkit;
 import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.List;
+import java.util.Arrays;
 import java.util.concurrent.TimeUnit;
+import java.util.stream.Stream;
+
+import static com.volmit.iris.core.nms.datapack.IDataFixer.Dimension.*;
 
 public class ServerConfigurator {
     public static void configure() {
@@ -84,12 +92,13 @@ public class ServerConfigurator {
         }
     }
 
-    private static List<File> getDatapacksFolder() {
+    private static KList<File> getDatapacksFolder() {
         if (!IrisSettings.get().getGeneral().forceMainWorld.isEmpty()) {
             return new KList<File>().qadd(new File(Bukkit.getWorldContainer(), IrisSettings.get().getGeneral().forceMainWorld + "/datapacks"));
         }
         KList<File> worlds = new KList<>();
         Bukkit.getServer().getWorlds().forEach(w -> worlds.add(new File(w.getWorldFolder(), "datapacks")));
+        if (worlds.isEmpty()) worlds.add(new File(Bukkit.getWorldContainer(), ServerProperties.LEVEL_NAME + "/datapacks"));
         return worlds;
     }
 
@@ -99,57 +108,17 @@ public class ServerConfigurator {
 
     public static void installDataPacks(IDataFixer fixer, boolean fullInstall) {
         Iris.info("Checking Data Packs...");
-        File packs = new File("plugins/Iris/packs");
-        double ultimateMaxHeight = 0;
-        double ultimateMinHeight = 0;
-        if (packs.exists() && packs.isDirectory()) {
-            for (File pack : packs.listFiles()) {
-                IrisData data = IrisData.get(pack);
-                if (pack.isDirectory()) {
-                    File dimensionsFolder = new File(pack, "dimensions");
-                    if (dimensionsFolder.exists() && dimensionsFolder.isDirectory()) {
-                        for (File file : dimensionsFolder.listFiles()) {
-                            if (file.isFile() && file.getName().endsWith(".json")) {
-                                IrisDimension dim = data.getDimensionLoader().load(file.getName().split("\\Q.\\E")[0]);
-                                if (ultimateMaxHeight < dim.getDimensionHeight().getMax()) {
-                                    ultimateMaxHeight = dim.getDimensionHeight().getMax();
-                                }
-                                if (ultimateMinHeight > dim.getDimensionHeight().getMin()) {
-                                    ultimateMinHeight = dim.getDimensionHeight().getMin();
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
+        DimensionHeight height = new DimensionHeight(fixer);
+        KList<File> folders = getDatapacksFolder();
+        KMap<String, KSet<String>> biomes = new KMap<>();
 
-        if (packs.exists()) {
-            for (File i : packs.listFiles()) {
-                if (i.isDirectory()) {
-                    Iris.verbose("Checking Pack: " + i.getPath());
-                    IrisData data = IrisData.get(i);
-                    File dims = new File(i, "dimensions");
-
-                    if (dims.exists()) {
-                        for (File j : dims.listFiles()) {
-                            if (j.getName().endsWith(".json")) {
-                                IrisDimension dim = data.getDimensionLoader().load(j.getName().split("\\Q.\\E")[0]);
-
-                                if (dim == null) {
-                                    continue;
-                                }
-
-                                Iris.verbose("  Checking Dimension " + dim.getLoadFile().getPath());
-                                for (File dpack : getDatapacksFolder()) {
-                                    dim.installDataPack(fixer, () -> data, dpack, ultimateMaxHeight, ultimateMinHeight);
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
+        allPacks().flatMap(height::merge)
+                .parallel()
+                .forEach(dim -> {
+                    Iris.verbose("  Checking Dimension " + dim.getLoadFile().getPath());
+                    dim.installBiomes(fixer, dim::getLoader, folders, biomes.computeIfAbsent(dim.getLoadKey(), k -> new KSet<>()));
+                });
+        IrisDimension.writeShared(folders, height);
 
         Iris.info("Data Packs Setup!");
 
@@ -158,57 +127,40 @@ public class ServerConfigurator {
     }
 
     private static void verifyDataPacksPost(boolean allowRestarting) {
-        File packs = new File("plugins/Iris/packs");
+        boolean bad = allPacks()
+                .map(data -> {
+                    Iris.verbose("Checking Pack: " + data.getDataFolder().getPath());
+                    var loader = data.getDimensionLoader();
+                    return loader.loadAll(loader.getPossibleKeys())
+                            .stream()
+                            .map(ServerConfigurator::verifyDataPackInstalled)
+                            .toList()
+                            .contains(false);
+                })
+                .toList()
+                .contains(true);
+        if (!bad) return;
 
-        boolean bad = false;
-        if (packs.exists()) {
-            for (File i : packs.listFiles()) {
-                if (i.isDirectory()) {
-                    Iris.verbose("Checking Pack: " + i.getPath());
-                    IrisData data = IrisData.get(i);
-                    File dims = new File(i, "dimensions");
 
-                    if (dims.exists()) {
-                        for (File j : dims.listFiles()) {
-                            if (j.getName().endsWith(".json")) {
-                                IrisDimension dim = data.getDimensionLoader().load(j.getName().split("\\Q.\\E")[0]);
+        if (allowRestarting) {
+            restart();
+        } else if (INMS.get().supportsDataPacks()) {
+            Iris.error("============================================================================");
+            Iris.error(C.ITALIC + "You need to restart your server to properly generate custom biomes.");
+            Iris.error(C.ITALIC + "By continuing, Iris will use backup biomes in place of the custom biomes.");
+            Iris.error("----------------------------------------------------------------------------");
+            Iris.error(C.UNDERLINE + "IT IS HIGHLY RECOMMENDED YOU RESTART THE SERVER BEFORE GENERATING!");
+            Iris.error("============================================================================");
 
-                                if (dim == null) {
-                                    Iris.error("Failed to load " + j.getPath() + " ");
-                                    continue;
-                                }
-
-                                if (!verifyDataPackInstalled(dim)) {
-                                    bad = true;
-                                }
-                            }
-                        }
-                    }
+            for (Player i : Bukkit.getOnlinePlayers()) {
+                if (i.isOp() || i.hasPermission("iris.all")) {
+                    VolmitSender sender = new VolmitSender(i, Iris.instance.getTag("WARNING"));
+                    sender.sendMessage("There are some Iris Packs that have custom biomes in them");
+                    sender.sendMessage("You need to restart your server to use these packs.");
                 }
             }
-        }
 
-        if (bad) {
-            if (allowRestarting) {
-                restart();
-            } else if (INMS.get().supportsDataPacks()) {
-                Iris.error("============================================================================");
-                Iris.error(C.ITALIC + "You need to restart your server to properly generate custom biomes.");
-                Iris.error(C.ITALIC + "By continuing, Iris will use backup biomes in place of the custom biomes.");
-                Iris.error("----------------------------------------------------------------------------");
-                Iris.error(C.UNDERLINE + "IT IS HIGHLY RECOMMENDED YOU RESTART THE SERVER BEFORE GENERATING!");
-                Iris.error("============================================================================");
-
-                for (Player i : Bukkit.getOnlinePlayers()) {
-                    if (i.isOp() || i.hasPermission("iris.all")) {
-                        VolmitSender sender = new VolmitSender(i, Iris.instance.getTag("WARNING"));
-                        sender.sendMessage("There are some Iris Packs that have custom biomes in them");
-                        sender.sendMessage("You need to restart your server to use these packs.");
-                    }
-                }
-
-                J.sleep(3000);
-            }
+            J.sleep(3000);
         }
     }
 
@@ -218,7 +170,7 @@ public class ServerConfigurator {
             Iris.warn("This will only happen when your pack changes (updates/first time setup)");
             Iris.warn("(You can disable this auto restart in iris settings)");
             J.s(() -> {
-                Iris.warn("Looks like the restart command diddn't work. Stopping the server instead!");
+                Iris.warn("Looks like the restart command didn't work. Stopping the server instead!");
                 Bukkit.shutdown();
             }, 100);
             Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "restart");
@@ -226,22 +178,24 @@ public class ServerConfigurator {
     }
 
     public static boolean verifyDataPackInstalled(IrisDimension dimension) {
-        IrisData idm = IrisData.get(Iris.instance.getDataFolder("packs", dimension.getLoadKey()));
         KSet<String> keys = new KSet<>();
         boolean warn = false;
 
-        for (IrisBiome i : dimension.getAllBiomes(() -> idm)) {
+        for (IrisBiome i : dimension.getAllBiomes(dimension::getLoader)) {
             if (i.isCustom()) {
                 for (IrisBiomeCustom j : i.getCustomDerivitives()) {
                     keys.add(dimension.getLoadKey() + ":" + j.getId());
                 }
             }
         }
+        String key = getWorld(dimension.getLoader());
+        if (key == null) key = dimension.getLoadKey();
+        else key += "/" + dimension.getLoadKey();
 
         if (!INMS.get().supportsDataPacks()) {
             if (!keys.isEmpty()) {
                 Iris.warn("===================================================================================");
-                Iris.warn("Pack " + dimension.getLoadKey() + " has " + keys.size() + " custom biome(s). ");
+                Iris.warn("Pack " + key + " has " + keys.size() + " custom biome(s). ");
                 Iris.warn("Your server version does not yet support datapacks for iris.");
                 Iris.warn("The world will generate these biomes as backup biomes.");
                 Iris.warn("====================================================================================");
@@ -260,10 +214,74 @@ public class ServerConfigurator {
         }
 
         if (warn) {
-            Iris.error("The Pack " + dimension.getLoadKey() + " is INCAPABLE of generating custom biomes");
+            Iris.error("The Pack " + key + " is INCAPABLE of generating custom biomes");
             Iris.error("If not done automatically, restart your server before generating with this pack!");
         }
 
         return !warn;
     }
+
+    public static Stream<IrisData> allPacks() {
+        return Stream.concat(listFiles(new File("plugins/Iris/packs")),
+                        listFiles(Bukkit.getWorldContainer()).map(w -> new File(w, "iris/pack")))
+                .filter(File::isDirectory)
+                .map(IrisData::get);
+    }
+
+    @Nullable
+    public static String getWorld(@NonNull IrisData data) {
+        String worldContainer = Bukkit.getWorldContainer().getAbsolutePath();
+        if (!worldContainer.endsWith(File.separator)) worldContainer += File.separator;
+        
+        String path = data.getDataFolder().getAbsolutePath();
+        if (!path.startsWith(worldContainer)) return null;
+        int l = path.endsWith(File.separator) ? 11 : 10;
+        return path.substring(worldContainer.length(), path.length() - l);
+    }
+
+    private static Stream<File> listFiles(File parent) {
+        var files = parent.listFiles();
+        return files == null ? Stream.empty() : Arrays.stream(files);
+    }
+
+    @Data
+    public static class DimensionHeight {
+        private final IDataFixer fixer;
+        private IrisRange overworld = new IrisRange();
+        private IrisRange nether = new IrisRange();
+        private IrisRange end = new IrisRange();
+        private int logicalOverworld = 0;
+        private int logicalNether = 0;
+        private int logicalEnd = 0;
+
+        public Stream<IrisDimension> merge(IrisData data) {
+            Iris.verbose("Checking Pack: " + data.getDataFolder().getPath());
+            var loader = data.getDimensionLoader();
+            return loader.loadAll(loader.getPossibleKeys())
+                    .stream()
+                    .peek(this::merge);
+        }
+
+        public void merge(IrisDimension dimension) {
+            overworld.merge(dimension.getDimensionHeight());
+            nether.merge(dimension.getDimensionHeight());
+            end.merge(dimension.getDimensionHeight());
+
+            logicalOverworld = Math.max(logicalOverworld, dimension.getLogicalHeight());
+            logicalNether = Math.max(logicalNether, dimension.getLogicalHeightNether());
+            logicalEnd = Math.max(logicalEnd, dimension.getLogicalHeightEnd());
+        }
+
+        public String overworldType() {
+            return fixer.createDimension(OVERRWORLD, overworld, logicalOverworld).toString(4);
+        }
+
+        public String netherType() {
+            return fixer.createDimension(NETHER, nether, logicalNether).toString(4);
+        }
+
+        public String endType() {
+            return fixer.createDimension(THE_END, end, logicalEnd).toString(4);
+        }
+    }
 }

core/src/main/java/com/volmit/iris/core/commands/CommandDeveloper.java

@@ -22,11 +22,11 @@ import com.volmit.iris.Iris;
 import com.volmit.iris.core.ServerConfigurator;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.nms.datapack.DataVersion;
-import com.volmit.iris.core.service.IrisEngineSVC;
 import com.volmit.iris.core.tools.IrisPackBenchmarking;
 import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.engine.object.IrisDimension;
+import com.volmit.iris.engine.service.EngineStatusSVC;
 import com.volmit.iris.util.decree.DecreeExecutor;
 import com.volmit.iris.util.decree.DecreeOrigin;
 import com.volmit.iris.util.decree.annotations.Decree;
@@ -66,53 +66,20 @@ public class CommandDeveloper implements DecreeExecutor {
 
     @Decree(description = "Get Loaded TectonicPlates Count", origin = DecreeOrigin.BOTH, sync = true)
     public void EngineStatus() {
-        List<World> IrisWorlds = new ArrayList<>();
-        int TotalLoadedChunks = 0;
-        int TotalQueuedTectonicPlates = 0;
-        int TotalNotQueuedTectonicPlates = 0;
-        int TotalTectonicPlates = 0;
+        var status = EngineStatusSVC.getStatus();
 
-        long lowestUnloadDuration = 0;
-        long highestUnloadDuration = 0;
-
-        for (World world : Bukkit.getWorlds()) {
-            try {
-                if (IrisToolbelt.access(world).getEngine() != null) {
-                    IrisWorlds.add(world);
-                }
-            } catch (Exception e) {
-                // no
-            }
-        }
-
-        for (World world : IrisWorlds) {
-            Engine engine = IrisToolbelt.access(world).getEngine();
-            TotalQueuedTectonicPlates += (int) engine.getMantle().getToUnload();
-            TotalNotQueuedTectonicPlates += (int) engine.getMantle().getNotQueuedLoadedRegions();
-            TotalTectonicPlates += engine.getMantle().getLoadedRegionCount();
-            if (highestUnloadDuration <= (long) engine.getMantle().getTectonicDuration()) {
-                highestUnloadDuration = (long) engine.getMantle().getTectonicDuration();
-            }
-            if (lowestUnloadDuration >= (long) engine.getMantle().getTectonicDuration()) {
-                lowestUnloadDuration = (long) engine.getMantle().getTectonicDuration();
-            }
-            for (Chunk chunk : world.getLoadedChunks()) {
-                if (chunk.isLoaded()) {
-                    TotalLoadedChunks++;
-                }
-            }
-        }
-        Iris.info("-------------------------");
-        Iris.info(C.DARK_PURPLE + "Engine Status");
-        Iris.info(C.DARK_PURPLE + "Total Loaded Chunks: " + C.LIGHT_PURPLE + TotalLoadedChunks);
-        Iris.info(C.DARK_PURPLE + "Tectonic Limit: " + C.LIGHT_PURPLE + IrisEngineSVC.getTectonicLimit());
-        Iris.info(C.DARK_PURPLE + "Tectonic Total Plates: " + C.LIGHT_PURPLE + TotalTectonicPlates);
-        Iris.info(C.DARK_PURPLE + "Tectonic Active Plates: " + C.LIGHT_PURPLE + TotalNotQueuedTectonicPlates);
-        Iris.info(C.DARK_PURPLE + "Tectonic ToUnload: " + C.LIGHT_PURPLE + TotalQueuedTectonicPlates);
-        Iris.info(C.DARK_PURPLE + "Lowest Tectonic Unload Duration: " + C.LIGHT_PURPLE + Form.duration(lowestUnloadDuration));
-        Iris.info(C.DARK_PURPLE + "Highest Tectonic Unload Duration: " + C.LIGHT_PURPLE + Form.duration(highestUnloadDuration));
-        Iris.info(C.DARK_PURPLE + "Cache Size: " + C.LIGHT_PURPLE + Form.f(IrisData.cacheSize()));
-        Iris.info("-------------------------");
+        sender().sendMessage("-------------------------");
+        sender().sendMessage(C.DARK_PURPLE + "Engine Status");
+        sender().sendMessage(C.DARK_PURPLE + "Total Engines: " + C.LIGHT_PURPLE + status.engineCount());
+        sender().sendMessage(C.DARK_PURPLE + "Total Loaded Chunks: " + C.LIGHT_PURPLE + status.loadedChunks());
+        sender().sendMessage(C.DARK_PURPLE + "Tectonic Limit: " + C.LIGHT_PURPLE + status.tectonicLimit());
+        sender().sendMessage(C.DARK_PURPLE + "Tectonic Total Plates: " + C.LIGHT_PURPLE + status.tectonicPlates());
+        sender().sendMessage(C.DARK_PURPLE + "Tectonic Active Plates: " + C.LIGHT_PURPLE + status.activeTectonicPlates());
+        sender().sendMessage(C.DARK_PURPLE + "Tectonic ToUnload: " + C.LIGHT_PURPLE + status.queuedTectonicPlates());
+        sender().sendMessage(C.DARK_PURPLE + "Lowest Tectonic Unload Duration: " + C.LIGHT_PURPLE + Form.duration(status.minTectonicUnloadDuration()));
+        sender().sendMessage(C.DARK_PURPLE + "Highest Tectonic Unload Duration: " + C.LIGHT_PURPLE + Form.duration(status.maxTectonicUnloadDuration()));
+        sender().sendMessage(C.DARK_PURPLE + "Cache Size: " + C.LIGHT_PURPLE + Form.f(IrisData.cacheSize()));
+        sender().sendMessage("-------------------------");
     }
 
     @Decree(description = "Test")
@@ -140,7 +107,7 @@ public class CommandDeveloper implements DecreeExecutor {
     public void packBenchmark(
             @Param(description = "The pack to bench", aliases = {"pack"}, defaultValue = "overworld")
             IrisDimension dimension,
-            @Param(description = "Radius in regions", defaultValue = "5")
+            @Param(description = "Radius in regions", defaultValue = "2048")
             int radius,
             @Param(description = "Open GUI while benchmarking", defaultValue = "false")
             boolean gui

core/src/main/java/com/volmit/iris/core/commands/CommandIris.java

@@ -21,6 +21,7 @@ package com.volmit.iris.core.commands;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.loader.IrisData;
+import com.volmit.iris.core.nms.INMS;
 import com.volmit.iris.core.pregenerator.ChunkUpdater;
 import com.volmit.iris.core.service.StudioSVC;
 import com.volmit.iris.core.tools.IrisBenchmarking;
@@ -412,7 +413,7 @@ public class CommandIris implements DecreeExecutor {
     ) {
         sender().sendMessage(C.GREEN + "Downloading pack: " + pack + "/" + branch + (trim ? " trimmed" : "") + (overwrite ? " overwriting" : ""));
         if (pack.equals("overworld")) {
-            String url = "https://github.com/IrisDimensions/overworld/releases/download/" + Iris.OVERWORLD_TAG + "/overworld.zip";
+            String url = "https://github.com/IrisDimensions/overworld/releases/download/" + INMS.OVERWORLD_TAG + "/overworld.zip";
             Iris.service(StudioSVC.class).downloadRelease(sender(), url, trim, overwrite);
         } else {
             Iris.service(StudioSVC.class).downloadSearch(sender(), "IrisDimensions/" + pack + "/" + branch, trim, overwrite);
@@ -598,10 +599,10 @@ public class CommandIris implements DecreeExecutor {
                     continue;
                 }
                 Iris.info(C.LIGHT_PURPLE + "Preparing Spawn for " + s + "' using Iris:" + generator + "...");
-                new WorldCreator(s)
+                WorldCreator c = new WorldCreator(s)
                         .generator(getDefaultWorldGenerator(s, generator))
-                        .environment(IrisData.loadAnyDimension(generator).getEnvironment())
-                        .createWorld();
+                        .environment(IrisData.loadAnyDimension(generator).getEnvironment());
+                INMS.get().createWorld(c);
                 Iris.info(C.LIGHT_PURPLE + "Loaded " + s + "!");
             }
         } catch (Throwable e) {

core/src/main/java/com/volmit/iris/core/commands/CommandPregen.java

@@ -19,9 +19,7 @@
 package com.volmit.iris.core.commands;
 
 import com.volmit.iris.Iris;
-import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.gui.PregeneratorJob;
-import com.volmit.iris.core.pregenerator.LazyPregenerator;
 import com.volmit.iris.core.pregenerator.PregenTask;
 import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.util.decree.DecreeExecutor;
@@ -29,12 +27,9 @@ import com.volmit.iris.util.decree.annotations.Decree;
 import com.volmit.iris.util.decree.annotations.Param;
 import com.volmit.iris.util.format.C;
 import com.volmit.iris.util.math.Position2;
-import org.bukkit.Bukkit;
 import org.bukkit.World;
 import org.bukkit.util.Vector;
 
-import java.io.File;
-
 @Decree(name = "pregen", aliases = "pregenerate", description = "Pregenerate your Iris worlds!")
 public class CommandPregen implements DecreeExecutor {
     @Decree(description = "Pregenerate a world")
@@ -52,13 +47,12 @@ public class CommandPregen implements DecreeExecutor {
                 sender().sendMessage(C.RED + "Please make sure the world is loaded & the engine is initialized. Generate a new chunk, for example.");
             }
             radius = Math.max(radius, 1024);
-            int w = (radius >> 9 + 1) * 2;
             IrisToolbelt.pregenerate(PregenTask
                     .builder()
-                    .center(new Position2(center.getBlockX() >> 9, center.getBlockZ() >> 9))
+                    .center(new Position2(center.getBlockX(), center.getBlockZ()))
                     .gui(true)
-                    .width(w)
-                    .height(w)
+                    .radiusX(radius)
+                    .radiusZ(radius)
                     .build(), world);
             String msg = C.GREEN + "Pregen started in " + C.GOLD + world.getName() + C.GREEN + " of " + C.GOLD + (radius * 2) + C.GREEN + " by " + C.GOLD + (radius * 2) + C.GREEN + " blocks from " + C.GOLD + center.getX() + "," + center.getZ();
             sender().sendMessage(msg);

core/src/main/java/com/volmit/iris/core/commands/CommandSupport.java

@@ -21,7 +21,6 @@ package com.volmit.iris.core.commands;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.pregenerator.ChunkUpdater;
-import com.volmit.iris.core.service.IrisEngineSVC;
 import com.volmit.iris.core.tools.IrisPackBenchmarking;
 import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.engine.framework.Engine;

core/src/main/java/com/volmit/iris/core/gui/PregeneratorJob.java

@@ -24,7 +24,6 @@ import com.volmit.iris.core.pregenerator.IrisPregenerator;
 import com.volmit.iris.core.pregenerator.PregenListener;
 import com.volmit.iris.core.pregenerator.PregenTask;
 import com.volmit.iris.core.pregenerator.PregeneratorMethod;
-import com.volmit.iris.core.tools.IrisPackBenchmarking;
 import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.format.Form;
@@ -45,8 +44,6 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.function.Consumer;
 
-import static com.volmit.iris.core.tools.IrisPackBenchmarking.benchmarkInProgress;
-
 public class PregeneratorJob implements PregenListener {
     private static final Color COLOR_EXISTS = parseColor("#4d7d5b");
     private static final Color COLOR_BLACK = parseColor("#4d7d5b");
@@ -81,12 +78,12 @@ public class PregeneratorJob implements PregenListener {
         this.task = task;
         this.pregenerator = new IrisPregenerator(task, method, this);
         max = new Position2(0, 0);
-        min = new Position2(0, 0);
-        task.iterateRegions((xx, zz) -> {
-            min.setX(Math.min(xx << 5, min.getX()));
-            min.setZ(Math.min(zz << 5, min.getZ()));
-            max.setX(Math.max((xx << 5) + 31, max.getX()));
-            max.setZ(Math.max((zz << 5) + 31, max.getZ()));
+        min = new Position2(Integer.MAX_VALUE, Integer.MAX_VALUE);
+        task.iterateAllChunks((xx, zz) -> {
+            min.setX(Math.min(xx, min.getX()));
+            min.setZ(Math.min(zz, min.getZ()));
+            max.setX(Math.max(xx, max.getX()));
+            max.setZ(Math.max(zz, max.getZ()));
         });
 
         if (IrisSettings.get().getGui().isUseServerLaunchedGuis() && task.isGui()) {
@@ -162,7 +159,7 @@ public class PregeneratorJob implements PregenListener {
     }
 
     public void drawRegion(int x, int z, Color color) {
-        J.a(() -> PregenTask.iterateRegion(x, z, (xx, zz) -> {
+        J.a(() -> task.iterateChunks(x, z, (xx, zz) -> {
             draw(xx, zz, color);
             J.sleep(3);
         }));

core/src/main/java/com/volmit/iris/core/link/NexoDataProvider.java

@@ -125,7 +125,7 @@ public class NexoDataProvider extends ExternalDataProvider {
     @NotNull
     @Override
     public Identifier[] getBlockTypes() {
-        return Arrays.stream(NexoItems.itemNames())
+        return NexoItems.itemNames().stream()
                 .map(i -> new Identifier("nexo", i))
                 .filter(i -> {
                     try {
@@ -140,7 +140,7 @@ public class NexoDataProvider extends ExternalDataProvider {
     @NotNull
     @Override
     public Identifier[] getItemTypes() {
-        return Arrays.stream(NexoItems.itemNames())
+        return NexoItems.itemNames().stream()
                 .map(i -> new Identifier("nexo", i))
                 .filter(i -> {
                     try {

core/src/main/java/com/volmit/iris/core/loader/ResourceLoader.java

@@ -44,6 +44,7 @@ import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
 import java.io.*;
+import java.util.Arrays;
 import java.util.Locale;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
@@ -219,6 +220,10 @@ public class ResourceLoader<T extends IrisRegistrant> implements MeteredCache {
         return s.map(this::load);
     }
 
+    public Stream<T> streamAllPossible() {
+        return streamAll(Arrays.stream(getPossibleKeys()));
+    }
+
     public KList<T> loadAll(KList<String> s) {
         KList<T> m = new KList<>();
 

core/src/main/java/com/volmit/iris/core/nms/INMS.java

@@ -23,6 +23,7 @@ import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.nms.v1X.NMSBinding1X;
 import org.bukkit.Bukkit;
 
+import java.util.List;
 import java.util.Map;
 
 public class INMS {
@@ -35,8 +36,15 @@ public class INMS {
             "1.21.3", "v1_21_R2",
             "1.21.4", "v1_21_R3"
     );
+    private static final List<Version> PACKS = List.of(
+            new Version(21, 4, "31020"),
+            new Version(21, 2, "31000"),
+            new Version(20, 1, "3910")
+    );
+
     //@done
     private static final INMSBinding binding = bind();
+    public static final String OVERWORLD_TAG = getOverworldTag();
 
     public static INMSBinding get() {
         return binding;
@@ -87,4 +95,26 @@ public class INMS {
 
         return new NMSBinding1X();
     }
+
+    private static String getOverworldTag() {
+        var version = Bukkit.getServer().getBukkitVersion().split("-")[0].split("\\.", 3);
+        int major = 0;
+        int minor = 0;
+
+        if (version.length > 2) {
+            major = Integer.parseInt(version[1]);
+            minor = Integer.parseInt(version[2]);
+        } else if (version.length == 2) {
+            major = Integer.parseInt(version[1]);
+        }
+
+        for (var p : PACKS) {
+            if (p.major > major || p.minor > minor)
+                continue;
+            return p.tag;
+        }
+        return "3910";
+    }
+
+    private record Version(int major, int minor, String tag) {}
 }

core/src/main/java/com/volmit/iris/core/nms/INMSBinding.java

@@ -18,6 +18,7 @@
 
 package com.volmit.iris.core.nms;
 
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.engine.framework.Engine;
@@ -30,15 +31,12 @@ import com.volmit.iris.util.nbt.mca.palette.MCAPaletteAccess;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
-import org.bukkit.entity.Dolphin;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.event.entity.CreatureSpawnEvent;
 import org.bukkit.generator.ChunkGenerator;
-import org.bukkit.generator.structure.Structure;
 import org.bukkit.inventory.ItemStack;
 
-import java.awt.*;
 import java.awt.Color;
 
 public interface INMSBinding {
@@ -91,7 +89,13 @@ public interface INMSBinding {
     MCABiomeContainer newBiomeContainer(int min, int max);
 
     default World createWorld(WorldCreator c) {
-        return c.createWorld();
+        if (missingDimensionTypes(true, true, true))
+            throw new IllegalStateException("Missing dimenstion types to create world");
+
+        try (var ignored = injectLevelStems()) {
+            ignored.storeContext();
+            return c.createWorld();
+        }
     }
 
     int countCustomBiomes();
@@ -125,4 +129,14 @@ public interface INMSBinding {
     }
 
     KList<String> getStructureKeys();
+
+    AutoClosing injectLevelStems();
+
+    default AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        return null;
+    }
+
+    boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end);
+
+    void removeCustomDimensions(World world);
 }

core/src/main/java/com/volmit/iris/core/nms/container/AutoClosing.java

@@ -0,0 +1,39 @@
+package com.volmit.iris.core.nms.container;
+
+import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.function.NastyRunnable;
+import lombok.AllArgsConstructor;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+@AllArgsConstructor
+public class AutoClosing implements AutoCloseable {
+    private static final KMap<Thread, AutoClosing> CONTEXTS = new KMap<>();
+    private final AtomicBoolean closed = new AtomicBoolean();
+    private final NastyRunnable action;
+
+    @Override
+    public void close() {
+        if (closed.getAndSet(true)) return;
+        try {
+            removeContext();
+            action.run();
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void storeContext() {
+        CONTEXTS.put(Thread.currentThread(), this);
+    }
+
+    public void removeContext() {
+        CONTEXTS.values().removeIf(c -> c == this);
+    }
+
+    public static void closeContext() {
+        AutoClosing closing = CONTEXTS.remove(Thread.currentThread());
+        if (closing == null) return;
+        closing.close();
+    }
+}

core/src/main/java/com/volmit/iris/core/nms/datapack/IDataFixer.java

@@ -1,11 +1,28 @@
 package com.volmit.iris.core.nms.datapack;
 
 import com.volmit.iris.engine.object.IrisBiomeCustom;
+import com.volmit.iris.engine.object.IrisRange;
 import com.volmit.iris.util.json.JSONObject;
 
 public interface IDataFixer {
 
-    JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json);
+    default JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json) {
+        return json;
+    }
 
-    JSONObject fixDimension(JSONObject json);
+    JSONObject rawDimension(Dimension dimension);
+
+    default JSONObject createDimension(Dimension dimension, IrisRange height, int logicalHeight) {
+        JSONObject obj = rawDimension(dimension);
+        obj.put("min_y", height.getMin());
+        obj.put("height", height.getMax() - height.getMin());
+        obj.put("logical_height", logicalHeight);
+        return obj;
+    }
+
+    enum Dimension {
+        OVERRWORLD,
+        NETHER,
+        THE_END
+    }
 }

core/src/main/java/com/volmit/iris/core/nms/datapack/v1192/DataFixerV1192.java

@@ -1,18 +1,81 @@
 package com.volmit.iris.core.nms.datapack.v1192;
 
 import com.volmit.iris.core.nms.datapack.IDataFixer;
-import com.volmit.iris.engine.object.IrisBiomeCustom;
 import com.volmit.iris.util.json.JSONObject;
+import java.util.Map;
 
 public class DataFixerV1192 implements IDataFixer {
 
-    @Override
-    public JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json) {
-        return json;
-    }
+    private static final Map<Dimension, String> DIMENSIONS = Map.of(
+            Dimension.OVERRWORLD, """
+            {
+              "ambient_light": 0.0,
+              "bed_works": true,
+              "coordinate_scale": 1.0,
+              "effects": "minecraft:overworld",
+              "has_ceiling": false,
+              "has_raids": true,
+              "has_skylight": true,
+              "infiniburn": "#minecraft:infiniburn_overworld",
+              "monster_spawn_block_light_limit": 0,
+              "monster_spawn_light_level": {
+                "type": "minecraft:uniform",
+                "value": {
+                  "max_inclusive": 7,
+                  "min_inclusive": 0
+                }
+              },
+              "natural": true,
+              "piglin_safe": false,
+              "respawn_anchor_works": false,
+              "ultrawarm": false
+            }""",
+            Dimension.NETHER, """
+            {
+              "ambient_light": 0.1,
+              "bed_works": false,
+              "coordinate_scale": 8.0,
+              "effects": "minecraft:the_nether",
+              "fixed_time": 18000,
+              "has_ceiling": true,
+              "has_raids": false,
+              "has_skylight": false,
+              "infiniburn": "#minecraft:infiniburn_nether",
+              "monster_spawn_block_light_limit": 15,
+              "monster_spawn_light_level": 7,
+              "natural": false,
+              "piglin_safe": true,
+              "respawn_anchor_works": true,
+              "ultrawarm": true
+            }""",
+            Dimension.THE_END, """
+            {
+              "ambient_light": 0.0,
+              "bed_works": false,
+              "coordinate_scale": 1.0,
+              "effects": "minecraft:the_end",
+              "fixed_time": 6000,
+              "has_ceiling": false,
+              "has_raids": true,
+              "has_skylight": false,
+              "infiniburn": "#minecraft:infiniburn_end",
+              "monster_spawn_block_light_limit": 0,
+              "monster_spawn_light_level": {
+                "type": "minecraft:uniform",
+                "value": {
+                  "max_inclusive": 7,
+                  "min_inclusive": 0
+                }
+              },
+              "natural": false,
+              "piglin_safe": false,
+              "respawn_anchor_works": false,
+              "ultrawarm": false
+            }"""
+    );
 
     @Override
-    public JSONObject fixDimension(JSONObject json) {
-        return json;
+    public JSONObject rawDimension(Dimension dimension) {
+        return new JSONObject(DIMENSIONS.get(dimension));
     }
 }

core/src/main/java/com/volmit/iris/core/nms/datapack/v1206/DataFixerV1206.java

@@ -1,6 +1,6 @@
 package com.volmit.iris.core.nms.datapack.v1206;
 
-import com.volmit.iris.core.nms.datapack.IDataFixer;
+import com.volmit.iris.core.nms.datapack.v1192.DataFixerV1192;
 import com.volmit.iris.engine.object.IrisBiomeCustom;
 import com.volmit.iris.engine.object.IrisBiomeCustomSpawn;
 import com.volmit.iris.engine.object.IrisBiomeCustomSpawnType;
@@ -10,7 +10,7 @@ import com.volmit.iris.util.json.JSONObject;
 
 import java.util.Locale;
 
-public class DataFixerV1206 implements IDataFixer {
+public class DataFixerV1206 extends DataFixerV1192 {
     @Override
     public JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json) {
         int spawnRarity = biome.getSpawnRarity();
@@ -45,7 +45,8 @@ public class DataFixerV1206 implements IDataFixer {
     }
 
     @Override
-    public JSONObject fixDimension(JSONObject json) {
+    public JSONObject rawDimension(Dimension dimension) {
+        JSONObject json = super.rawDimension(dimension);
         if (!(json.get("monster_spawn_light_level") instanceof JSONObject lightLevel))
             return json;
         var value = (JSONObject) lightLevel.remove("value");

core/src/main/java/com/volmit/iris/core/nms/v1X/NMSBinding1X.java

@@ -20,7 +20,9 @@ package com.volmit.iris.core.nms.v1X;
 
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.nms.INMSBinding;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
+import com.volmit.iris.core.nms.container.Pair;
 import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KMap;
@@ -118,6 +120,26 @@ public class NMSBinding1X implements INMSBinding {
         return new KList<>(list);
     }
 
+    @Override
+    public AutoClosing injectLevelStems() {
+        return new AutoClosing(() -> {});
+    }
+
+    @Override
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        return injectLevelStems();
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        return false;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+
+    }
+
     @Override
     public CompoundTag serializeEntity(Entity location) {
         return null;

core/src/main/java/com/volmit/iris/core/pregenerator/ChunkUpdater.java

@@ -165,8 +165,11 @@ public class ChunkUpdater {
             if (rX < dimensions.min.getX() || rX > dimensions.max.getX() || rZ < dimensions.min.getZ() || rZ > dimensions.max.getZ()) {
                 return;
             }
+            if (!new File(world.getWorldFolder(), "region" + File.separator + rX + "." + rZ + ".mca").exists()) {
+                return;
+            }
 
-            PregenTask.iterateRegion(rX, rZ, (x, z) -> {
+            task.iterateChunks(rX, rZ, (x, z) -> {
                 while (paused.get() && !cancelled.get()) {
                     J.sleep(50);
                 }
@@ -348,8 +351,8 @@ public class ChunkUpdater {
         int width = maxZ - minZ + 1;
 
         return new Dimensions(new Position2(minX, minZ), new Position2(maxX, maxZ), height * width, PregenTask.builder()
-                .width((int) Math.ceil(width / 2d))
-                .height((int) Math.ceil(height / 2d))
+                .radiusZ((int) Math.ceil(width / 2d * 512))
+                .radiusX((int) Math.ceil(height / 2d * 512))
                 .center(new Position2(oX, oZ))
                 .build());
     }

core/src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java

@@ -19,7 +19,6 @@
 package com.volmit.iris.core.pregenerator;
 
 import com.volmit.iris.Iris;
-import com.volmit.iris.core.pack.IrisPack;
 import com.volmit.iris.core.tools.IrisPackBenchmarking;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KSet;
@@ -83,7 +82,7 @@ public class IrisPregenerator {
         generatedLast = new AtomicInteger(0);
         generatedLastMinute = new AtomicInteger(0);
         totalChunks = new AtomicInteger(0);
-        task.iterateRegions((_a, _b) -> totalChunks.addAndGet(1024));
+        task.iterateAllChunks((_a, _b) -> totalChunks.incrementAndGet());
         startTime = new AtomicLong(M.ms());
         ticker = new Looper() {
             @Override
@@ -194,7 +193,7 @@ public class IrisPregenerator {
         } else if (!regions) {
             hit = true;
             listener.onRegionGenerating(x, z);
-            PregenTask.iterateRegion(x, z, (xx, zz) -> {
+            task.iterateChunks(x, z, (xx, zz) -> {
                 while (paused.get() && !shutdown.get()) {
                     J.sleep(50);
                 }

core/src/main/java/com/volmit/iris/core/pregenerator/PregenTask.java

@@ -32,17 +32,26 @@ import java.util.Comparator;
 @Data
 public class PregenTask {
     private static final Position2 ZERO = new Position2(0, 0);
-    private static final KList<Position2> ORDER_CENTER = computeChunkOrder();
     private static final KMap<Position2, KList<Position2>> ORDERS = new KMap<>();
 
     @Builder.Default
-    private boolean gui = false;
+    private final boolean gui = false;
     @Builder.Default
-    private Position2 center = new Position2(0, 0);
+    private final Position2 center = new Position2(0, 0);
     @Builder.Default
-    private int width = 1;
+    private final int radiusX = 1;
     @Builder.Default
-    private int height = 1;
+    private final int radiusZ = 1;
+
+    private final Bounds bounds = new Bounds();
+
+    protected PregenTask(boolean gui, Position2 center, int radiusX, int radiusZ) {
+        this.gui = gui;
+        this.center = new ProxiedPos(center);
+        this.radiusX = radiusX;
+        this.radiusZ = radiusZ;
+        bounds.update();
+    }
 
     public static void iterateRegion(int xr, int zr, Spiraled s, Position2 pull) {
         for (Position2 i : ORDERS.computeIfAbsent(pull, PregenTask::computeOrder)) {
@@ -70,29 +79,72 @@ public class PregenTask {
         return p;
     }
 
-    private static KList<Position2> computeChunkOrder() {
-        Position2 center = new Position2(15, 15);
-        KList<Position2> p = new KList<>();
-        new Spiraler(33, 33, (x, z) -> {
-            int xx = x + 15;
-            int zz = z + 15;
-            if (xx < 0 || xx > 31 || zz < 0 || zz > 31) {
-                return;
-            }
-
-            p.add(new Position2(xx, zz));
-        }).drain();
-        p.sort(Comparator.comparing((i) -> i.distance(center)));
-        return p;
+    public void iterateRegions(Spiraled s) {
+        var bound = bounds.region();
+        new Spiraler(bound.sizeX, bound.sizeZ, ((x, z) -> {
+            if (bound.check(x, z)) s.on(x, z);
+        })).setOffset(center.getX() >> 9, center.getZ() >> 9).drain();
     }
 
-    public void iterateRegions(Spiraled s) {
-        new Spiraler(getWidth() * 2, getHeight() * 2, s)
-                .setOffset(center.getX(), center.getZ()).drain();
+    public void iterateChunks(int rX, int rZ, Spiraled s) {
+        var bound = bounds.chunk();
+        iterateRegion(rX, rZ, ((x, z) -> {
+            if (bound.check(x, z)) s.on(x, z);
+        }));
     }
 
     public void iterateAllChunks(Spiraled s) {
-        new Spiraler(getWidth() * 2, getHeight() * 2, (x, z) -> iterateRegion(x, z, s))
-                .setOffset(center.getX(), center.getZ()).drain();
+        iterateRegions(((rX, rZ) -> iterateChunks(rX, rZ, s)));
+    }
+
+    private class Bounds {
+        private Bound chunk = null;
+        private Bound region = null;
+
+        public void update() {
+            int maxX = center.getX() + radiusX;
+            int maxZ = center.getZ() + radiusZ;
+            int minX = center.getX() - radiusX;
+            int minZ = center.getZ() - radiusZ;
+
+            chunk = new Bound(minX >> 4, minZ >> 4, Math.ceilDiv(maxX, 16), Math.ceilDiv(maxZ, 16));
+            region = new Bound(minX >> 9, minZ >> 9, Math.ceilDiv(maxX, 512), Math.ceilDiv(maxZ, 512));
+        }
+
+        public Bound chunk() {
+            if (chunk == null) update();
+            return chunk;
+        }
+
+        public Bound region() {
+            if (region == null) update();
+            return region;
+        }
+    }
+
+    private record Bound(int minX, int maxX, int minZ, int maxZ, int sizeX, int sizeZ) {
+        private Bound(int minX, int minZ, int maxX, int maxZ) {
+            this(minX, maxX, minZ, maxZ, maxZ - minZ + 1, maxZ - minZ + 1);
+        }
+
+        boolean check(int x, int z) {
+            return x >= minX && x <= maxX && z >= minZ && z <= maxZ;
+        }
+    }
+
+    private static class ProxiedPos extends Position2 {
+        public ProxiedPos(Position2 p) {
+            super(p.getX(), p.getZ());
+        }
+
+        @Override
+        public void setX(int x) {
+            throw new IllegalStateException("This Position2 may not be modified");
+        }
+
+        @Override
+        public void setZ(int z) {
+            throw new IllegalStateException("This Position2 may not be modified");
+        }
     }
 }

core/src/main/java/com/volmit/iris/core/safeguard/IrisSafeguard.java

@@ -1,6 +1,7 @@
 package com.volmit.iris.core.safeguard;
 
 import com.volmit.iris.Iris;
+import com.volmit.iris.core.IrisSettings;
 
 public class IrisSafeguard {
     public static boolean unstablemode = false;
@@ -11,5 +12,13 @@ public class IrisSafeguard {
         Iris.info("Enabled Iris SafeGuard");
         ServerBootSFG.BootCheck();
     }
+
+    public static void earlySplash() {
+        if (ServerBootSFG.safeguardPassed || IrisSettings.get().getGeneral().DoomsdayAnnihilationSelfDestructMode)
+            return;
+
+        Iris.instance.splash();
+        UtilsSFG.splash();
+    }
 }
 

core/src/main/java/com/volmit/iris/core/safeguard/ServerBootSFG.java

@@ -3,6 +3,7 @@ package com.volmit.iris.core.safeguard;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.nms.INMS;
 import com.volmit.iris.core.nms.v1X.NMSBinding1X;
+import com.volmit.iris.engine.object.IrisContextInjector;
 import org.bukkit.Bukkit;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginManager;
@@ -29,6 +30,7 @@ public class ServerBootSFG {
     public static boolean isJRE = false;
     public static boolean hasPrivileges = true;
     public static boolean unsuportedversion = false;
+    public static boolean missingDimensionTypes = false;
     protected static boolean safeguardPassed;
     public static boolean passedserversoftware = true;
     protected static int count;
@@ -110,6 +112,12 @@ public class ServerBootSFG {
             severityMedium++;
         }
 
+        if (IrisContextInjector.isMissingDimensionTypes()) {
+            missingDimensionTypes = true;
+            joiner.add("Missing Dimension Types");
+            severityHigh++;
+        }
+
         allIncompatibilities = joiner.toString();
 
         safeguardPassed = (severityHigh == 0 && severityMedium == 0 && severityLow == 0);

core/src/main/java/com/volmit/iris/core/safeguard/UtilsSFG.java

@@ -39,6 +39,11 @@ public class UtilsSFG {
                 Iris.safeguard(C.RED + "Server Version");
                 Iris.safeguard(C.RED + "- Iris only supports 1.20.1 > 1.21.4");
             }
+            if (ServerBootSFG.missingDimensionTypes) {
+                Iris.safeguard(C.RED + "Dimension Types");
+                Iris.safeguard(C.RED + "- Required Iris dimension types were not loaded.");
+                Iris.safeguard(C.RED + "- If this still happens after a restart please contact support.");
+            }
             if (!ServerBootSFG.passedserversoftware) {
                 Iris.safeguard(C.YELLOW + "Unsupported Server Software");
                 Iris.safeguard(C.YELLOW + "- Please consider using Paper or Purpur instead.");

core/src/main/java/com/volmit/iris/core/service/IrisEngineSVC.java

@@ -1,317 +0,0 @@
-package com.volmit.iris.core.service;
-
-import com.volmit.iris.Iris;
-import com.volmit.iris.core.IrisSettings;
-import com.volmit.iris.core.tools.IrisToolbelt;
-import com.volmit.iris.engine.framework.Engine;
-import com.volmit.iris.engine.platform.PlatformChunkGenerator;
-import com.volmit.iris.util.collection.KList;
-import com.volmit.iris.util.collection.KMap;
-import com.volmit.iris.util.format.C;
-import com.volmit.iris.util.format.Form;
-import com.volmit.iris.util.mantle.TectonicPlate;
-import com.volmit.iris.util.misc.getHardware;
-import com.volmit.iris.util.plugin.IrisService;
-import com.volmit.iris.util.scheduling.ChronoLatch;
-import com.volmit.iris.util.scheduling.Looper;
-import com.volmit.iris.util.scheduling.PrecisionStopwatch;
-import org.bukkit.Bukkit;
-import org.bukkit.World;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.server.PluginDisableEvent;
-import org.bukkit.event.server.ServerLoadEvent;
-import org.bukkit.event.world.WorldLoadEvent;
-import org.bukkit.event.world.WorldUnloadEvent;
-import org.checkerframework.checker.units.qual.A;
-
-import java.util.*;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicLong;
-import java.util.concurrent.locks.ReentrantLock;
-import java.util.function.Supplier;
-
-public class IrisEngineSVC implements IrisService {
-    public static IrisEngineSVC instance;
-    public boolean isServerShuttingDown = false;
-    public boolean isServerLoaded = false;
-    private static final AtomicInteger tectonicLimit = new AtomicInteger(30);
-    private ReentrantLock lastUseLock;
-    private KMap<World, Long> lastUse;
-    private List<World> IrisWorlds;
-    private Looper cacheTicker;
-    private Looper trimTicker;
-    private Looper unloadTicker;
-    private Looper updateTicker;
-    private PrecisionStopwatch trimAlive;
-    private PrecisionStopwatch unloadAlive;
-    public PrecisionStopwatch trimActiveAlive;
-    public PrecisionStopwatch unloadActiveAlive;
-    private AtomicInteger TotalTectonicPlates;
-    private AtomicInteger TotalQueuedTectonicPlates;
-    private AtomicInteger TotalNotQueuedTectonicPlates;
-    private AtomicBoolean IsUnloadAlive;
-    private AtomicBoolean IsTrimAlive;
-    ChronoLatch cl;
-
-    public List<World> corruptedIrisWorlds = new ArrayList<>();
-
-    @Override
-    public void onEnable() {
-        this.cl = new ChronoLatch(5000);
-        lastUse = new KMap<>();
-        lastUseLock = new ReentrantLock();
-        IrisWorlds = new ArrayList<>();
-        IsUnloadAlive = new AtomicBoolean(true);
-        IsTrimAlive = new AtomicBoolean(true);
-        trimActiveAlive = new PrecisionStopwatch();
-        unloadActiveAlive = new PrecisionStopwatch();
-        trimAlive = new PrecisionStopwatch();
-        unloadAlive = new PrecisionStopwatch();
-        TotalTectonicPlates = new AtomicInteger();
-        TotalQueuedTectonicPlates = new AtomicInteger();
-        TotalNotQueuedTectonicPlates = new AtomicInteger();
-        tectonicLimit.set(2);
-        long t = getHardware.getProcessMemory();
-        while (t > 200) {
-            tectonicLimit.getAndAdd(1);
-            t = t - 200;
-        }
-        this.setup();
-        this.TrimLogic();
-        this.UnloadLogic();
-
-        trimAlive.begin();
-        unloadAlive.begin();
-        trimActiveAlive.begin();
-        unloadActiveAlive.begin();
-
-        updateTicker.start();
-        cacheTicker.start();
-        //trimTicker.start();
-        //unloadTicker.start();
-        instance = this;
-
-    }
-
-    public void engineStatus() {
-        boolean trimAlive = trimTicker.isAlive();
-        boolean unloadAlive = unloadTicker.isAlive();
-        Iris.info("Status:");
-        Iris.info("- Trim: " + trimAlive);
-        Iris.info("- Unload: " + unloadAlive);
-
-    }
-
-    public static int getTectonicLimit() {
-        return tectonicLimit.get();
-    }
-
-    @EventHandler
-    public void onWorldUnload(WorldUnloadEvent event) {
-        updateWorlds();
-    }
-
-    @EventHandler
-    public void onWorldLoad(WorldLoadEvent event) {
-        updateWorlds();
-    }
-
-    @EventHandler
-    public void onServerBoot(ServerLoadEvent event) {
-        isServerLoaded = true;
-    }
-
-    @EventHandler
-    public void onPluginDisable(PluginDisableEvent event) {
-        if (event.getPlugin().equals(Iris.instance)) {
-            isServerShuttingDown = true;
-        }
-    }
-
-    public void updateWorlds() {
-        for (World world : Bukkit.getWorlds()) {
-            try {
-                if (IrisToolbelt.access(world).getEngine() != null) {
-                    IrisWorlds.add(world);
-                }
-            } catch (Exception e) {
-                // no
-            }
-        }
-    }
-
-    private void setup() {
-        cacheTicker = new Looper() {
-            @Override
-            protected long loop() {
-                long now = System.currentTimeMillis();
-                lastUseLock.lock();
-                try {
-                    for (World key : new ArrayList<>(lastUse.keySet())) {
-                        Long last = lastUse.get(key);
-                        if (last == null)
-                            continue;
-                        if (now - last > 60000) {
-                            lastUse.remove(key);
-                        }
-                    }
-                } finally {
-                    lastUseLock.unlock();
-                }
-                return 1000;
-            }
-        };
-
-        updateTicker = new Looper() {
-            @Override
-            protected long loop() {
-                try {
-                    TotalQueuedTectonicPlates.set(0);
-                    TotalNotQueuedTectonicPlates.set(0);
-                    TotalTectonicPlates.set(0);
-                    for (World world : IrisWorlds) {
-                        Engine engine = Objects.requireNonNull(IrisToolbelt.access(world)).getEngine();
-                        TotalQueuedTectonicPlates.addAndGet((int) engine.getMantle().getToUnload());
-                        TotalNotQueuedTectonicPlates.addAndGet((int) engine.getMantle().getNotQueuedLoadedRegions());
-                        TotalTectonicPlates.addAndGet(engine.getMantle().getLoadedRegionCount());
-                    }
-                    if (!isServerShuttingDown && isServerLoaded) {
-                        if (!trimTicker.isAlive()) {
-                            Iris.info(C.RED + "TrimTicker found dead! Booting it up!");
-                            try {
-                                TrimLogic();
-                            } catch (Exception e) {
-                                Iris.error("What happened?");
-                                e.printStackTrace();
-                            }
-                        }
-
-                        if (!unloadTicker.isAlive()) {
-                            Iris.info(C.RED + "UnloadTicker found dead! Booting it up!");
-                            try {
-                               UnloadLogic();
-                            } catch (Exception e) {
-                                Iris.error("What happened?");
-                                e.printStackTrace();
-                            }
-                        }
-                    }
-
-                } catch (Exception e) {
-                    return -1;
-                }
-                return 1000;
-            }
-        };
-    }
-    public void TrimLogic() {
-        if (trimTicker == null || !trimTicker.isAlive()) {
-            trimTicker = new Looper() {
-                private final Supplier<Engine> supplier = createSupplier();
-
-                @Override
-                protected long loop() {
-                    long start = System.currentTimeMillis();
-                    trimAlive.reset();
-                    try {
-                        Engine engine = supplier.get();
-                        if (engine != null) {
-                            engine.getMantle().trim(tectonicLimit.get() / lastUse.size());
-                        }
-                    } catch (Throwable e) {
-                        Iris.reportError(e);
-                        Iris.info(C.RED + "EngineSVC: Failed to trim.");
-                        e.printStackTrace();
-                        return -1;
-                    }
-
-                    int size = lastUse.size();
-                    long time = (size > 0 ? 1000 / size : 1000) - (System.currentTimeMillis() - start);
-                    if (time <= 0)
-                        return 0;
-                    return time;
-                }
-            };
-            trimTicker.start();
-        }
-    }
-    public void UnloadLogic() {
-        if (unloadTicker == null || !unloadTicker.isAlive()) {
-            unloadTicker = new Looper() {
-                private final Supplier<Engine> supplier = createSupplier();
-
-                @Override
-                protected long loop() {
-                    long start = System.currentTimeMillis();
-                    unloadAlive.reset();
-                    try {
-                        Engine engine = supplier.get();
-                        if (engine != null) {
-                            long unloadStart = System.currentTimeMillis();
-                            int count = engine.getMantle().unloadTectonicPlate(tectonicLimit.get() / lastUse.size());
-                            if (count > 0) {
-                                Iris.debug(C.GOLD + "Unloaded " + C.YELLOW + count + " TectonicPlates in " + C.RED + Form.duration(System.currentTimeMillis() - unloadStart, 2));
-                            }
-                        }
-                    } catch (Throwable e) {
-                        Iris.reportError(e);
-                        Iris.info(C.RED + "EngineSVC: Failed to unload.");
-                        e.printStackTrace();
-                        return -1;
-                    }
-
-                    int size = lastUse.size();
-                    long time = (size > 0 ? 1000 / size : 1000) - (System.currentTimeMillis() - start);
-                    if (time <= 0)
-                        return 0;
-                    return time;
-                }
-            };
-            unloadTicker.start();
-        }
-    }
-
-    private Supplier<Engine> createSupplier() {
-        AtomicInteger i = new AtomicInteger();
-        return () -> {
-            List<World> worlds = Bukkit.getWorlds();
-            if (i.get() >= worlds.size()) {
-                i.set(0);
-            }
-            try {
-                for (int j = 0; j < worlds.size(); j++) {
-                    World world = worlds.get(i.getAndIncrement());
-                    PlatformChunkGenerator generator = IrisToolbelt.access(world);
-                    if (i.get() >= worlds.size()) {
-                        i.set(0);
-                    }
-
-                    if (generator != null) {
-                        Engine engine = generator.getEngine();
-                        boolean closed = engine.getMantle().getData().isClosed();
-                        if (engine != null && !engine.isStudio() && !closed) {
-                            lastUseLock.lock();
-                            lastUse.put(world, System.currentTimeMillis());
-                            lastUseLock.unlock();
-                            return engine;
-                        }
-                    }
-                }
-            } catch (Throwable e) {
-                Iris.info(C.RED + "EngineSVC: Failed to create supplier.");
-                e.printStackTrace();
-                Iris.reportError(e);
-            }
-            return null;
-        };
-    }
-
-    @Override
-    public void onDisable() {
-        cacheTicker.interrupt();
-        trimTicker.interrupt();
-        unloadTicker.interrupt();
-        lastUse.clear();
-    }
-}

core/src/main/java/com/volmit/iris/core/service/StudioSVC.java

@@ -24,6 +24,7 @@ import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.ServerConfigurator;
 import com.volmit.iris.core.loader.IrisData;
+import com.volmit.iris.core.nms.INMS;
 import com.volmit.iris.core.pack.IrisPack;
 import com.volmit.iris.core.project.IrisProject;
 import com.volmit.iris.core.tools.IrisToolbelt;
@@ -64,7 +65,7 @@ public class StudioSVC implements IrisService {
             if (!f.exists()) {
                 Iris.info("Downloading Default Pack " + pack);
                 if (pack.equals("overworld")) {
-                    String url = "https://github.com/IrisDimensions/overworld/releases/download/" + Iris.OVERWORLD_TAG + "/overworld.zip";
+                    String url = "https://github.com/IrisDimensions/overworld/releases/download/" + INMS.OVERWORLD_TAG + "/overworld.zip";
                     Iris.service(StudioSVC.class).downloadRelease(Iris.getSender(), url, false, false);
                 } else {
                     downloadSearch(Iris.getSender(), pack, false);

core/src/main/java/com/volmit/iris/core/tools/IrisCreator.java

@@ -22,6 +22,7 @@ import com.google.common.util.concurrent.AtomicDouble;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.ServerConfigurator;
+import com.volmit.iris.core.nms.INMS;
 import com.volmit.iris.core.pregenerator.PregenTask;
 import com.volmit.iris.core.service.StudioSVC;
 import com.volmit.iris.engine.object.IrisDimension;
@@ -170,7 +171,7 @@ public class IrisCreator {
 
         try {
             J.sfut(() -> {
-                world.set(wc.createWorld());
+                world.set(INMS.get().createWorld(wc));
             }).get();
         } catch (Throwable e) {
             e.printStackTrace();

core/src/main/java/com/volmit/iris/core/tools/IrisPackBenchmarking.java

@@ -146,8 +146,8 @@ public class IrisPackBenchmarking {
         IrisToolbelt.pregenerate(PregenTask
                 .builder()
                 .gui(gui)
-                .width(radius)
-                .height(radius)
+                .radiusX(radius)
+                .radiusZ(radius)
                 .build(), Bukkit.getWorld("benchmark")
         );
     }

core/src/main/java/com/volmit/iris/core/tools/IrisWorldCreator.java

@@ -21,10 +21,13 @@ package com.volmit.iris.core.tools;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.engine.object.*;
 import com.volmit.iris.engine.platform.BukkitChunkGenerator;
+import com.volmit.iris.util.reflect.WrappedField;
 import org.bukkit.Bukkit;
 import org.bukkit.World;
 import org.bukkit.WorldCreator;
+import org.bukkit.WorldType;
 import org.bukkit.generator.ChunkGenerator;
+import sun.misc.Unsafe;
 
 import java.io.File;
 

core/src/main/java/com/volmit/iris/engine/IrisEngine.java

@@ -43,6 +43,7 @@ import com.volmit.iris.util.format.C;
 import com.volmit.iris.util.format.Form;
 import com.volmit.iris.util.hunk.Hunk;
 import com.volmit.iris.util.io.IO;
+import com.volmit.iris.util.io.JarScanner;
 import com.volmit.iris.util.mantle.MantleFlag;
 import com.volmit.iris.util.math.M;
 import com.volmit.iris.util.math.RNG;
@@ -60,7 +61,11 @@ import org.bukkit.command.CommandSender;
 
 import java.io.File;
 import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Collections;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -71,6 +76,8 @@ import java.util.concurrent.atomic.AtomicLong;
 @EqualsAndHashCode(exclude = "context")
 @ToString(exclude = "context")
 public class IrisEngine implements Engine {
+    private static final Map<Class<? extends IrisEngineService>, Constructor<? extends IrisEngineService>> SERVICES = scanServices();
+    private final KMap<Class<? extends IrisEngineService>, IrisEngineService> services;
     private final AtomicInteger bud;
     private final AtomicInteger buds;
     private final AtomicInteger generated;
@@ -111,6 +118,7 @@ public class IrisEngine implements Engine {
         getEngineData();
         verifySeed();
         this.seedManager = new SeedManager(target.getWorld().getRawWorldSeed());
+        services = new KMap<>();
         bud = new AtomicInteger(0);
         buds = new AtomicInteger(0);
         metrics = new EngineMetrics(32);
@@ -137,6 +145,26 @@ public class IrisEngine implements Engine {
         Iris.debug("Engine Initialized " + getCacheID());
     }
 
+    @SuppressWarnings("unchecked")
+    private static Map<Class<? extends IrisEngineService>, Constructor<? extends IrisEngineService>> scanServices() {
+        JarScanner js = new JarScanner(Iris.instance.getJarFile(), "com.volmit.iris.engine.service");
+        J.attempt(js::scan);
+        KMap<Class<? extends IrisEngineService>, Constructor<? extends IrisEngineService>> map = new KMap<>();
+        js.getClasses()
+                .stream()
+                .filter(IrisEngineService.class::isAssignableFrom)
+                .map(c -> (Class<? extends IrisEngineService>) c)
+                .forEach(c -> {
+                    try {
+                        map.put(c, c.getConstructor(Engine.class));
+                    } catch (NoSuchMethodException e) {
+                        Iris.warn("Failed to load service " + c.getName() + " due to missing constructor");
+                    }
+                });
+
+        return Collections.unmodifiableMap(map);
+    }
+
     private void verifySeed() {
         if (getEngineData().getSeed() != null && getEngineData().getSeed() != target.getWorld().getRawWorldSeed()) {
             target.getWorld().setRawWorldSeed(getEngineData().getSeed());
@@ -161,6 +189,8 @@ public class IrisEngine implements Engine {
         execution.close();
         effects.close();
         mode.close();
+        services.values().forEach(s -> s.onDisable(true));
+        services.values().forEach(Iris.instance::unregisterListener);
 
         J.a(() -> new IrisProject(getData().getDataFolder()).updateWorkspace());
     }
@@ -169,6 +199,24 @@ public class IrisEngine implements Engine {
         try {
             Iris.debug("Setup Engine " + getCacheID());
             cacheId = RNG.r.nextInt();
+            boolean hotload = true;
+            if (services.isEmpty()) {
+                SERVICES.forEach((s, c) -> {
+                    try {
+                        services.put(s, c.newInstance(this));
+                    } catch (InstantiationException | IllegalAccessException |
+                             InvocationTargetException e) {
+                        Iris.error("Failed to create service " + s.getName());
+                        e.printStackTrace();
+                    }
+                });
+                hotload = false;
+            }
+            for (var service : services.values()) {
+                service.onEnable(hotload);
+                Iris.instance.registerListener(service);
+            }
+
             worldManager = new IrisWorldManager(this);
             complex = new IrisComplex(this);
             execution = new IrisExecutionEnvironment(this);
@@ -418,6 +466,7 @@ public class IrisEngine implements Engine {
         PregeneratorJob.shutdownInstance();
         closed = true;
         J.car(art);
+        services.values().forEach(s -> s.onDisable(false));
         getWorldManager().close();
         getTarget().close();
         saveEngineData();

core/src/main/java/com/volmit/iris/engine/IrisWorldManager.java

@@ -27,7 +27,6 @@ import com.volmit.iris.engine.object.*;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KMap;
 import com.volmit.iris.util.collection.KSet;
-import com.volmit.iris.util.format.Form;
 import com.volmit.iris.util.mantle.Mantle;
 import com.volmit.iris.util.mantle.MantleFlag;
 import com.volmit.iris.util.math.M;
@@ -72,7 +71,6 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
     private final Looper looper;
     private final int id;
     private final KList<Runnable> updateQueue = new KList<>();
-    private final ChronoLatch cl;
     private final ChronoLatch clw;
     private final ChronoLatch ecl;
     private final ChronoLatch cln;
@@ -83,12 +81,10 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
     private long charge = 0;
     private int actuallySpawned = 0;
     private int cooldown = 0;
-    private List<Entity> precount = new KList<>();
     private KSet<Position2> injectBiomes = new KSet<>();
 
     public IrisWorldManager() {
         super(null);
-        cl = null;
         ecl = null;
         cln = null;
         clw = null;
@@ -103,7 +99,6 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
         chunkUpdater = new ChronoLatch(3000);
         chunkDiscovery = new ChronoLatch(5000);
         cln = new ChronoLatch(60000);
-        cl = new ChronoLatch(3000);
         ecl = new ChronoLatch(250);
         clw = new ChronoLatch(1000, true);
         id = engine.getCacheID();
@@ -151,27 +146,12 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
                         engine.getEngineData().cleanup(getEngine());
                     }
 
-                    if (precount != null) {
-                        entityCount = 0;
-                        for (Entity i : precount) {
-                            if (i instanceof LivingEntity) {
-                                if (!i.isDead()) {
-                                    entityCount++;
-                                }
-                            }
-                        }
-
-                        precount = null;
-                    }
-
                     if (energy < 650) {
                         if (ecl.flip()) {
                             energy *= 1 + (0.02 * M.clip((1D - getEntitySaturation()), 0D, 1D));
                             fixEnergy();
                         }
                     }
-
-                    onAsyncTick();
                 }
 
                 return IrisSettings.get().getWorld().getAsyncTickIntervalMS();
@@ -214,7 +194,7 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
                             int finalZ = c.getZ() + z;
                             J.a(() -> getMantle().raiseFlag(finalX, finalZ, MantleFlag.INITIAL_SPAWNED_MARKER,
                                     () -> {
-                                        J.a(() -> spawnIn(cx, true), RNG.r.i(5, 200));
+                                        J.a(() -> spawnIn(cx), RNG.r.i(5, 200));
                                         getSpawnersFromMarkers(cx).forEach((blockf, spawners) -> {
                                             if (spawners.isEmpty()) {
                                                 return;
@@ -222,7 +202,7 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
 
                                             IrisPosition block = new IrisPosition(blockf.getX(), blockf.getY() + getEngine().getWorld().minHeight(), blockf.getZ());
                                             IrisSpawner s = new KList<>(spawners).getRandom();
-                                            spawn(block, s, true);
+                                            spawn(block, s);
                                         });
                                     }));
                         }
@@ -232,73 +212,16 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
         }
     }
 
-    private boolean onAsyncTick() {
-        if (getEngine().isClosed()) {
-            return false;
-        }
-
-        actuallySpawned = 0;
-
-        if (energy < 100) {
-            J.sleep(200);
-            return false;
-        }
-
-        if (!getEngine().getWorld().hasRealWorld()) {
-            Iris.debug("Can't spawn. No real world");
-            J.sleep(5000);
-            return false;
-        }
-
-        double epx = getEntitySaturation();
-        if (epx > IrisSettings.get().getWorld().getTargetSpawnEntitiesPerChunk()) {
-            Iris.debug("Can't spawn. The entity per chunk ratio is at " + Form.pc(epx, 2) + " > 100% (total entities " + entityCount + ")");
-            J.sleep(5000);
-            return false;
-        }
-
-        if (cl.flip()) {
-            try {
-                J.s(() -> precount = getEngine().getWorld().realWorld().getEntities());
-            } catch (Throwable e) {
-                close();
-            }
-        }
-
-        int spawnBuffer = RNG.r.i(2, 12);
-
-        Chunk[] cc = getEngine().getWorld().realWorld().getLoadedChunks();
-        while (spawnBuffer-- > 0) {
-            if (cc.length == 0) {
-                Iris.debug("Can't spawn. No chunks!");
-                return false;
-            }
-
-            Chunk c = cc[RNG.r.nextInt(cc.length)];
-
-            if (!c.isLoaded() || !Chunks.isSafe(c.getWorld(), c.getX(), c.getZ())) {
-                continue;
-            }
-
-            spawnIn(c, false);
-        }
-
-        energy -= (actuallySpawned / 2D);
-        return actuallySpawned > 0;
-    }
-
     private void fixEnergy() {
         energy = M.clip(energy, 1D, getDimension().getMaximumEnergy());
     }
 
-    private void spawnIn(Chunk c, boolean initial) {
+    private void spawnIn(Chunk c) {
         if (getEngine().isClosed()) {
             return;
         }
 
-        if (initial) {
-            energy += 1.2;
-        }
+        energy += 1.2;
 
         if (IrisSettings.get().getWorld().isMarkerEntitySpawningSystem()) {
             getSpawnersFromMarkers(c).forEach((blockf, spawners) -> {
@@ -308,9 +231,8 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
 
                 IrisPosition block = new IrisPosition(blockf.getX(), blockf.getY() + getEngine().getWorld().minHeight(), blockf.getZ());
                 IrisSpawner s = new KList<>(spawners).getRandom();
-                spawn(block, s, false);
                 J.a(() -> getMantle().raiseFlag(c.getX(), c.getZ(), MantleFlag.INITIAL_SPAWNED_MARKER,
-                        () -> spawn(block, s, true)));
+                        () -> spawn(block, s)));
             });
         }
 
@@ -341,7 +263,7 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
                                         .stream()
                                         .filter(filter)))
                 .filter(counter)
-                .flatMap((i) -> stream(i, initial))
+                .flatMap(this::stream)
                 .collect(Collectors.toList()))
                 .getRandom();
         //@done
@@ -378,13 +300,13 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
         }
     }
 
-    private Stream<IrisEntitySpawn> stream(IrisSpawner s, boolean initial) {
-        for (IrisEntitySpawn i : initial ? s.getInitialSpawns() : s.getSpawns()) {
+    private Stream<IrisEntitySpawn> stream(IrisSpawner s) {
+        for (IrisEntitySpawn i : s.getInitialSpawns()) {
             i.setReferenceSpawner(s);
             i.setReferenceMarker(s.getReferenceMarker());
         }
 
-        return (initial ? s.getInitialSpawns() : s.getSpawns()).stream();
+        return (s.getInitialSpawns()).stream();
     }
 
     private KList<IrisEntitySpawn> spawnRandomly(List<IrisEntitySpawn> types) {
@@ -431,7 +353,7 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
         }
     }
 
-    private void spawn(IrisPosition block, IrisSpawner spawner, boolean initial) {
+    private void spawn(IrisPosition block, IrisSpawner spawner) {
         if (getEngine().isClosed()) {
             return;
         }
@@ -440,7 +362,7 @@ public class IrisWorldManager extends EngineAssignedWorldManager {
             return;
         }
 
-        KList<IrisEntitySpawn> s = initial ? spawner.getInitialSpawns() : spawner.getSpawns();
+        KList<IrisEntitySpawn> s = spawner.getInitialSpawns();
         if (s.isEmpty()) {
             return;
         }

core/src/main/java/com/volmit/iris/engine/object/IrisContextInjector.java

@@ -0,0 +1,66 @@
+package com.volmit.iris.engine.object;
+
+import com.volmit.iris.core.nms.INMS;
+import com.volmit.iris.core.nms.container.AutoClosing;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.misc.ServerProperties;
+import lombok.Getter;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.world.WorldInitEvent;
+
+import java.util.List;
+
+import static com.volmit.iris.Iris.instance;
+
+public class IrisContextInjector implements Listener {
+    @Getter
+    private static boolean missingDimensionTypes = false;
+    private AutoClosing autoClosing = null;
+
+    public IrisContextInjector() {
+        if (!Bukkit.getWorlds().isEmpty()) return;
+
+        String levelName = ServerProperties.LEVEL_NAME;
+        List<String> irisWorlds = irisWorlds();
+        boolean overworld = irisWorlds.contains(levelName);
+        boolean nether = irisWorlds.contains(levelName + "_nether");
+        boolean end = irisWorlds.contains(levelName + "_end");
+
+        if (INMS.get().missingDimensionTypes(overworld, nether, end)) {
+            missingDimensionTypes = true;
+            return;
+        }
+
+        if (overworld || nether || end) {
+            autoClosing = INMS.get().injectUncached(overworld, nether, end);
+        }
+
+        instance.registerListener(this);
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void on(WorldInitEvent event) {
+        if (autoClosing != null) {
+            autoClosing.close();
+            autoClosing = null;
+        }
+        instance.unregisterListener(this);
+    }
+
+    private List<String> irisWorlds() {
+        var config = YamlConfiguration.loadConfiguration(ServerProperties.BUKKIT_YML);
+        ConfigurationSection section = config.getConfigurationSection("worlds");
+        if (section == null) return List.of();
+
+        return section.getKeys(false)
+                .stream()
+                .filter(k -> section.getString(k + ".generator", "").startsWith("Iris"))
+                .toList();
+    }
+}

core/src/main/java/com/volmit/iris/engine/object/IrisDimension.java

@@ -19,6 +19,8 @@
 package com.volmit.iris.engine.object;
 
 import com.volmit.iris.Iris;
+import com.volmit.iris.core.IrisSettings;
+import com.volmit.iris.core.ServerConfigurator.DimensionHeight;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.loader.IrisRegistrant;
 import com.volmit.iris.core.nms.INMS;
@@ -26,6 +28,7 @@ import com.volmit.iris.core.nms.datapack.IDataFixer;
 import com.volmit.iris.engine.data.cache.AtomicCache;
 import com.volmit.iris.engine.object.annotations.*;
 import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.collection.KSet;
 import com.volmit.iris.util.data.DataProvider;
 import com.volmit.iris.util.io.IO;
 import com.volmit.iris.util.json.JSONObject;
@@ -54,73 +57,6 @@ import java.io.IOException;
 public class IrisDimension extends IrisRegistrant {
     public static final BlockData STONE = Material.STONE.createBlockData();
     public static final BlockData WATER = Material.WATER.createBlockData();
-    private static final String DP_OVERWORLD_DEFAULT = """
-            {
-              "ambient_light": 0.0,
-              "bed_works": true,
-              "coordinate_scale": 1.0,
-              "effects": "minecraft:overworld",
-              "has_ceiling": false,
-              "has_raids": true,
-              "has_skylight": true,
-              "infiniburn": "#minecraft:infiniburn_overworld",
-              "monster_spawn_block_light_limit": 0,
-              "monster_spawn_light_level": {
-                "type": "minecraft:uniform",
-                "value": {
-                  "max_inclusive": 7,
-                  "min_inclusive": 0
-                }
-              },
-              "natural": true,
-              "piglin_safe": false,
-              "respawn_anchor_works": false,
-              "ultrawarm": false
-            }""";
-
-    private static final String DP_NETHER_DEFAULT = """
-            {
-              "ambient_light": 0.1,
-              "bed_works": false,
-              "coordinate_scale": 8.0,
-              "effects": "minecraft:the_nether",
-              "fixed_time": 18000,
-              "has_ceiling": true,
-              "has_raids": false,
-              "has_skylight": false,
-              "infiniburn": "#minecraft:infiniburn_nether",
-              "monster_spawn_block_light_limit": 15,
-              "monster_spawn_light_level": 7,
-              "natural": false,
-              "piglin_safe": true,
-              "respawn_anchor_works": true,
-              "ultrawarm": true
-            }""";
-
-    private static final String DP_END_DEFAULT = """
-            {
-              "ambient_light": 0.0,
-              "bed_works": false,
-              "coordinate_scale": 1.0,
-              "effects": "minecraft:the_end",
-              "fixed_time": 6000,
-              "has_ceiling": false,
-              "has_raids": true,
-              "has_skylight": false,
-              "infiniburn": "#minecraft:infiniburn_end",
-              "monster_spawn_block_light_limit": 0,
-              "monster_spawn_light_level": {
-                "type": "minecraft:uniform",
-                "value": {
-                  "max_inclusive": 7,
-                  "min_inclusive": 0
-                }
-              },
-              "natural": false,
-              "piglin_safe": false,
-              "respawn_anchor_works": false,
-              "ultrawarm": false
-            }""";
     private final transient AtomicCache<Position2> parallaxSize = new AtomicCache<>();
     private final transient AtomicCache<CNG> rockLayerGenerator = new AtomicCache<>();
     private final transient AtomicCache<CNG> fluidLayerGenerator = new AtomicCache<>();
@@ -443,61 +379,35 @@ public class IrisDimension extends IrisRegistrant {
         return landBiomeStyle;
     }
 
-    public boolean installDataPack(IDataFixer fixer, DataProvider data, File datapacks, double ultimateMaxHeight, double ultimateMinHeight) {
-        boolean write = false;
-        boolean changed = false;
-
-        IO.delete(new File(datapacks, "iris/data/" + getLoadKey().toLowerCase()));
-
-        for (IrisBiome i : getAllBiomes(data)) {
-            if (i.isCustom()) {
-                write = true;
-
-                for (IrisBiomeCustom j : i.getCustomDerivitives()) {
-                    File output = new File(datapacks, "iris/data/" + getLoadKey().toLowerCase() + "/worldgen/biome/" + j.getId() + ".json");
-
-                    if (!output.exists()) {
-                        changed = true;
-                    }
-
-                    Iris.verbose("    Installing Data Pack Biome: " + output.getPath());
-                    output.getParentFile().mkdirs();
-                    try {
-                        IO.writeAll(output, j.generateJson(fixer));
-                    } catch (IOException e) {
-                        Iris.reportError(e);
-                        e.printStackTrace();
-                    }
-                }
-            }
-        }
-
-        if (!dimensionHeight.equals(new IrisRange(-64, 320)) && this.name.equalsIgnoreCase("overworld")) {
-            Iris.verbose("    Installing Data Pack Dimension Types: \"minecraft:overworld\", \"minecraft:the_nether\", \"minecraft:the_end\"");
-            dimensionHeight.setMax(ultimateMaxHeight);
-            dimensionHeight.setMin(ultimateMinHeight);
-            changed = writeDimensionType(fixer, changed, datapacks);
-        }
-
-        if (write) {
-            File mcm = new File(datapacks, "iris/pack.mcmeta");
-            try {
-                IO.writeAll(mcm, """
-                        {
-                            "pack": {
-                                "description": "Iris Data Pack. This pack contains all installed Iris Packs' resources.",
-                                "pack_format": {}
-                            }
+    public void installBiomes(IDataFixer fixer, DataProvider data, KList<File> folders, KSet<String> biomes) {
+        getAllBiomes(data)
+                .stream()
+                .filter(IrisBiome::isCustom)
+                .map(IrisBiome::getCustomDerivitives)
+                .flatMap(KList::stream)
+                .parallel()
+                .forEach(j -> {
+                    String json = j.generateJson(fixer);
+                    synchronized (biomes) {
+                        if (!biomes.add(j.getId())) {
+                            Iris.verbose("Duplicate Data Pack Biome: " + getLoadKey() + "/" + j.getId());
+                            return;
                         }
-                        """.replace("{}", INMS.get().getDataVersion().getPackFormat() + ""));
-            } catch (IOException e) {
-                Iris.reportError(e);
-                e.printStackTrace();
-            }
-            Iris.verbose("    Installing Data Pack MCMeta: " + mcm.getPath());
-        }
+                    }
 
-        return changed;
+                    for (File datapacks : folders) {
+                        File output = new File(datapacks, "iris/data/" + getLoadKey().toLowerCase() + "/worldgen/biome/" + j.getId() + ".json");
+
+                        Iris.verbose("    Installing Data Pack Biome: " + output.getPath());
+                        output.getParentFile().mkdirs();
+                        try {
+                            IO.writeAll(output, json);
+                        } catch (IOException e) {
+                            Iris.reportError(e);
+                            e.printStackTrace();
+                        }
+                    }
+                });
     }
 
     @Override
@@ -515,66 +425,55 @@ public class IrisDimension extends IrisRegistrant {
 
     }
 
-    public boolean writeDimensionType(IDataFixer fixer, boolean changed, File datapacks) {
-        File dimTypeOverworld = new File(datapacks, "iris/data/minecraft/dimension_type/overworld.json");
-        if (!dimTypeOverworld.exists())
-            changed = true;
-        dimTypeOverworld.getParentFile().mkdirs();
+    public static void writeShared(KList<File> folders, DimensionHeight height) {
+        Iris.verbose("    Installing Data Pack Dimension Types: \"iris:overworld\", \"iris:the_nether\", \"iris:the_end\"");
+        for (File datapacks : folders) {
+            write(datapacks, "overworld", height.overworldType());
+            write(datapacks, "the_nether", height.netherType());
+            write(datapacks, "the_end", height.endType());
+        }
+
+        String raw = """
+                        {
+                            "pack": {
+                                "description": "Iris Data Pack. This pack contains all installed Iris Packs' resources.",
+                                "pack_format": {}
+                            }
+                        }
+                        """.replace("{}", INMS.get().getDataVersion().getPackFormat() + "");
+
+        for (File datapacks : folders) {
+            File mcm = new File(datapacks, "iris/pack.mcmeta");
+            try {
+                IO.writeAll(mcm, raw);
+            } catch (IOException e) {
+                Iris.reportError(e);
+                e.printStackTrace();
+            }
+            Iris.verbose("    Installing Data Pack MCMeta: " + mcm.getPath());
+        }
+    }
+
+    private static void write(File datapacks, String type, String json) {
+        File dimType = new File(datapacks, "iris/data/iris/dimension_type/" + type + ".json");
+        File dimTypeVanilla = new File(datapacks, "iris/data/minecraft/dimension_type/" + type + ".json");
+
+        dimType.getParentFile().mkdirs();
         try {
-            IO.writeAll(dimTypeOverworld, generateDatapackJsonOverworld(fixer));
+            IO.writeAll(dimType, json);
         } catch (IOException e) {
             Iris.reportError(e);
             e.printStackTrace();
         }
 
-
-        File dimTypeNether = new File(datapacks, "iris/data/minecraft/dimension_type/the_nether.json");
-        if (!dimTypeNether.exists())
-            changed = true;
-        dimTypeNether.getParentFile().mkdirs();
-        try {
-            IO.writeAll(dimTypeNether, generateDatapackJsonNether(fixer));
-        } catch (IOException e) {
-            Iris.reportError(e);
-            e.printStackTrace();
+        if (IrisSettings.get().getGeneral().adjustVanillaHeight || dimTypeVanilla.exists()) {
+            dimTypeVanilla.getParentFile().mkdirs();
+            try {
+                IO.writeAll(dimTypeVanilla, json);
+            } catch (IOException e) {
+                Iris.reportError(e);
+                e.printStackTrace();
+            }
         }
-
-
-        File dimTypeEnd = new File(datapacks, "iris/data/minecraft/dimension_type/the_end.json");
-        if (!dimTypeEnd.exists())
-            changed = true;
-        dimTypeEnd.getParentFile().mkdirs();
-        try {
-            IO.writeAll(dimTypeEnd, generateDatapackJsonEnd(fixer));
-        } catch (IOException e) {
-            Iris.reportError(e);
-            e.printStackTrace();
-        }
-
-        return changed;
-    }
-
-    private String generateDatapackJsonOverworld(IDataFixer fixer) {
-        JSONObject obj = new JSONObject(DP_OVERWORLD_DEFAULT);
-        obj.put("min_y", dimensionHeight.getMin());
-        obj.put("height", dimensionHeight.getMax() - dimensionHeight.getMin());
-        obj.put("logical_height", logicalHeight);
-        return fixer.fixDimension(obj).toString(4);
-    }
-
-    private String generateDatapackJsonNether(IDataFixer fixer) {
-        JSONObject obj = new JSONObject(DP_NETHER_DEFAULT);
-        obj.put("min_y", dimensionHeightNether.getMin());
-        obj.put("height", dimensionHeightNether.getMax() - dimensionHeightNether.getMin());
-        obj.put("logical_height", logicalHeightNether);
-        return fixer.fixDimension(obj).toString(4);
-    }
-
-    private String generateDatapackJsonEnd(IDataFixer fixer) {
-        JSONObject obj = new JSONObject(DP_END_DEFAULT);
-        obj.put("min_y", dimensionHeightEnd.getMin());
-        obj.put("height", dimensionHeightEnd.getMax() - dimensionHeightEnd.getMin());
-        obj.put("logical_height", logicalHeightEnd);
-        return fixer.fixDimension(obj).toString(4);
     }
 }

core/src/main/java/com/volmit/iris/engine/object/IrisEngineService.java

@@ -0,0 +1,19 @@
+package com.volmit.iris.engine.object;
+
+import com.volmit.iris.Iris;
+import com.volmit.iris.engine.framework.Engine;
+import lombok.RequiredArgsConstructor;
+import org.bukkit.event.Listener;
+
+@RequiredArgsConstructor
+public abstract class IrisEngineService implements Listener {
+    protected final Engine engine;
+
+    public abstract void onEnable(boolean hotload);
+
+    public abstract void onDisable(boolean hotload);
+
+    public final void postShutdown(Runnable r) {
+        Iris.instance.postShutdown(r);
+    }
+}

core/src/main/java/com/volmit/iris/engine/object/IrisEntity.java

@@ -404,7 +404,7 @@ public class IrisEntity extends IrisRegistrant {
         });
 
 
-        return e;
+        return e.isValid() ? e : null;
     }
 
     private int surfaceY(Location l) {

core/src/main/java/com/volmit/iris/engine/object/IrisEntitySpawn.java

@@ -28,19 +28,12 @@ import com.volmit.iris.util.math.RNG;
 import com.volmit.iris.util.math.Vector3d;
 import com.volmit.iris.util.matter.MatterMarker;
 import com.volmit.iris.util.matter.slices.MarkerMatter;
-import io.lumine.mythic.bukkit.adapters.BukkitEntity;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 import lombok.experimental.Accessors;
-import org.bukkit.Chunk;
-import org.bukkit.Location;
-import org.bukkit.Material;
-import org.bukkit.World;
+import org.bukkit.*;
 import org.bukkit.entity.Entity;
-import org.bukkit.entity.EntityType;
-import org.bukkit.entity.LivingEntity;
-import org.bukkit.util.BoundingBox;
 
 @Snippet("entity-spawn")
 @Accessors(chain = true)
@@ -69,6 +62,10 @@ public class IrisEntitySpawn implements IRare {
     private transient IrisSpawner referenceSpawner;
     private transient IrisMarker referenceMarker;
 
+    public boolean check(Engine eng, IrisPosition c, ChunkSnapshot snapshot) {
+        return getRealEntity(eng).getSurface().matches(snapshot.getBlockData(c.getX() & 15, c.getY(), c.getZ() & 15));
+    }
+
     public int spawn(Engine gen, Chunk c, RNG rng) {
         int spawns = minSpawns == maxSpawns ? minSpawns : rng.i(Math.min(minSpawns, maxSpawns), Math.max(minSpawns, maxSpawns));
         int s = 0;
@@ -168,7 +165,7 @@ public class IrisEntitySpawn implements IRare {
                 return null;
             }
 
-            if (!ignoreSurfaces && !irisEntity.getSurface().matches(at.clone().subtract(0, 1, 0).getBlock())) {
+            if (!ignoreSurfaces && !irisEntity.getSurface().matches(at.clone().subtract(0, 1, 0).getBlock().getBlockData())) {
                 return null;
             }
 
@@ -183,6 +180,10 @@ public class IrisEntitySpawn implements IRare {
             Entity e = irisEntity.spawn(g, at.add(0.5, 0.5, 0.5), rng.aquire(() -> new RNG(g.getSeedManager().getEntity())));
             if (e != null) {
                 Iris.debug("Spawned " + C.DARK_AQUA + "Entity<" + getEntity() + "> " + C.GREEN + e.getType() + C.LIGHT_PURPLE + " @ " + C.GRAY + e.getLocation().getX() + ", " + e.getLocation().getY() + ", " + e.getLocation().getZ());
+
+                if (referenceSpawner != null) {
+                    referenceSpawner.getConditions().apply(e);
+                }
             }
 
             return e;

core/src/main/java/com/volmit/iris/engine/object/IrisRange.java

@@ -50,4 +50,10 @@ public class IrisRange {
     public boolean contains(int v) {
         return v >= min && v <= max;
     }
+
+    public IrisRange merge(IrisRange other) {
+        min = Math.min(min, other.min);
+        max = Math.max(max, other.max);
+        return this;
+    }
 }

core/src/main/java/com/volmit/iris/engine/object/IrisSpawnCondition.java

@@ -0,0 +1,58 @@
+package com.volmit.iris.engine.object;
+
+import com.volmit.iris.Iris;
+import com.volmit.iris.engine.object.annotations.Desc;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.collection.KMap;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.experimental.Accessors;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.SpawnCategory;
+import org.bukkit.persistence.PersistentDataType;
+
+import java.util.UUID;
+import java.util.function.BooleanSupplier;
+
+@Accessors(chain = true)
+@NoArgsConstructor
+@AllArgsConstructor
+@Desc("Conditions for a spawner to be triggered")
+@Data
+public class IrisSpawnCondition {
+    private static final NamespacedKey CATEGORY_KEY = new NamespacedKey(Iris.instance, "spawn_category");
+
+    private SpawnCategory category = SpawnCategory.AMBIENT;
+    private int maxEntities = 60;
+
+    public boolean check(KMap<UUID, KMap<String, Boolean>> cache, KList<Entity> entities) {
+        int entityCount = 0;
+        for (Entity entity : entities) {
+            var map = cache.computeIfAbsent(entity.getUniqueId(), k -> new KMap<>());
+            if (check(map, "category_" + category.name(), () -> checkCategory(entity, category)) && ++entityCount >= maxEntities)
+                return false;
+        }
+        return true;
+    }
+
+    public void apply(Entity entity) {
+        var pdc = entity.getPersistentDataContainer();
+        pdc.set(CATEGORY_KEY, PersistentDataType.STRING, category.name());
+    }
+
+    private static boolean check(KMap<String, Boolean> cache, String key, BooleanSupplier predicate) {
+        return cache.computeIfAbsent(key, k -> predicate.getAsBoolean()) == Boolean.TRUE;
+    }
+
+    private static boolean checkCategory(Entity entity, SpawnCategory category) {
+        if (entity.getSpawnCategory() == category)
+            return true;
+
+        var pdc = entity.getPersistentDataContainer();
+        if (!pdc.has(CATEGORY_KEY, PersistentDataType.STRING))
+            return false;
+        return category.name().equals(pdc.get(CATEGORY_KEY, PersistentDataType.STRING));
+    }
+}

core/src/main/java/com/volmit/iris/engine/object/IrisSpawner.java

@@ -74,6 +74,9 @@ public class IrisSpawner extends IrisRegistrant {
     @Desc("Where should these spawns be placed")
     private IrisSpawnGroup group = IrisSpawnGroup.NORMAL;
 
+    @Desc("Conditions for this spawner to be triggered")
+    private IrisSpawnCondition conditions = new IrisSpawnCondition();
+
     public boolean isValid(IrisBiome biome) {
         return switch (group) {
             case NORMAL -> switch (biome.getInferredType()) {

core/src/main/java/com/volmit/iris/engine/object/IrisSurface.java

@@ -20,7 +20,7 @@ package com.volmit.iris.engine.object;
 
 import com.volmit.iris.engine.object.annotations.Desc;
 import org.bukkit.Material;
-import org.bukkit.block.Block;
+import org.bukkit.block.data.BlockData;
 import org.bukkit.block.data.Waterlogged;
 
 @Desc("The type of surface entities should spawn on")
@@ -47,8 +47,8 @@ public enum IrisSurface {
      * @param state The blockstate
      * @return True if it matches
      */
-    public boolean matches(Block state) {
-        Material type = state.getType();
+    public boolean matches(BlockData state) {
+        Material type = state.getMaterial();
         if (type.isSolid()) {
             return this == LAND || this == OVERWORLD || (this == ANIMAL
                     && (type == Material.GRASS_BLOCK || type == Material.DIRT

core/src/main/java/com/volmit/iris/engine/platform/BukkitChunkGenerator.java

@@ -21,6 +21,7 @@ package com.volmit.iris.engine.platform;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.nms.INMS;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.service.StudioSVC;
 import com.volmit.iris.engine.IrisEngine;
 import com.volmit.iris.engine.data.chunk.TerrainChunk;
@@ -48,6 +49,7 @@ import org.bukkit.block.data.BlockData;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.world.WorldInitEvent;
 import org.bukkit.generator.BiomeProvider;
@@ -122,11 +124,13 @@ public class BukkitChunkGenerator extends ChunkGenerator implements PlatformChun
         }
     }
 
-    @EventHandler
+    @EventHandler(priority = EventPriority.LOWEST)
     public void onWorldInit(WorldInitEvent event) {
         try {
             if (initialized || !world.name().equals(event.getWorld().getName()))
                 return;
+            AutoClosing.closeContext();
+            INMS.get().removeCustomDimensions(event.getWorld());
             world.setRawWorldSeed(event.getWorld().getSeed());
             Engine engine = getEngine(event.getWorld());
             if (engine == null) {

core/src/main/java/com/volmit/iris/engine/service/EngineMobHandlerSVC.java

@@ -0,0 +1,340 @@
+package com.volmit.iris.engine.service;
+
+import com.google.common.util.concurrent.AtomicDouble;
+import com.volmit.iris.Iris;
+import com.volmit.iris.core.IrisSettings;
+import com.volmit.iris.core.loader.IrisData;
+import com.volmit.iris.core.nms.container.Pair;
+import com.volmit.iris.engine.IrisWorldManager;
+import com.volmit.iris.engine.framework.Engine;
+import com.volmit.iris.engine.object.*;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.collection.KSet;
+import com.volmit.iris.util.format.Form;
+import com.volmit.iris.util.mantle.Mantle;
+import com.volmit.iris.util.math.BlockPosition;
+import com.volmit.iris.util.math.Position2;
+import com.volmit.iris.util.math.RNG;
+import com.volmit.iris.util.matter.MatterMarker;
+import com.volmit.iris.util.parallel.Sync;
+import com.volmit.iris.util.scheduling.J;
+import com.volmit.iris.util.scheduling.PrecisionStopwatch;
+import io.papermc.lib.PaperLib;
+import lombok.SneakyThrows;
+import org.bukkit.ChunkSnapshot;
+import org.bukkit.GameRule;
+import org.bukkit.World;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerChangedWorldEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class EngineMobHandlerSVC extends IrisEngineService {
+    private static final List<String> CAVE_TAGS = List.of("cave_floor", "cave_ceiling");
+    private static final int SAFE_RADIUS = 16;
+    private static final int MAX_RADIUS = 128;
+
+    private final AtomicLong currentTick = new AtomicLong();
+    private final Sync<Long> sync = new Sync<>();
+    private final Set<Player> players = ConcurrentHashMap.newKeySet();
+    private final AtomicBoolean running = new AtomicBoolean(false);
+    private transient KList<Entity> entities = new KList<>();
+    private transient Thread asyncTicker = null;
+    private transient Thread entityCollector = null;
+    private transient boolean charge = false;
+    private transient int task = -1;
+
+    public EngineMobHandlerSVC(Engine engine) {
+        super(engine);
+    }
+
+    @Override
+    public void onEnable(boolean hotload) {
+        if (running.get()) {
+            running.set(false);
+            cancel(asyncTicker);
+            cancel(entityCollector);
+        }
+
+        running.set(true);
+        charge = hotload;
+        asyncTicker = Thread.ofPlatform()
+                .name("Iris Async Mob Spawning - " + engine.getWorld().name())
+                .priority(9)
+                .start(() -> {
+                    while (mayLoop()) {
+                        try {
+                            asyncTick();
+                        } catch (Throwable e) {
+                            if (isInterrupted(e))
+                                return;
+                            Iris.error("Error in async tick for " + engine.getWorld().name());
+                            e.printStackTrace();
+
+                            J.sleep(100);
+                        }
+                    }
+                });
+        entityCollector = Thread.ofVirtual()
+                .name("Iris Async Entity Collector - " + engine.getWorld().name())
+                .start(() -> {
+                    while (mayLoop()) {
+                        try {
+                            sync.next().get();
+                            var world = engine.getWorld().realWorld();
+                            if (world == null) continue;
+                            J.s(() -> entities = new KList<>(world.getEntities()));
+                        } catch (Throwable e) {
+                            if (isInterrupted(e))
+                                return;
+
+                            Iris.error("Error in async tick for " + engine.getWorld().name());
+                            e.printStackTrace();
+
+                            J.sleep(100);
+                        }
+                    }
+                });
+        if (task != -1) J.csr(task);
+        task = J.sr(() -> sync.advance(currentTick.getAndIncrement()), 0);
+    }
+
+    @Override
+    public void onDisable(boolean hotload) {
+        running.set(false);
+        cancel(asyncTicker);
+        cancel(entityCollector);
+        if (!hotload) J.csr(task);
+    }
+
+    private void asyncTick() throws Throwable {
+        long tick = sync.next().get();
+        var manager = (IrisWorldManager) engine.getWorldManager();
+        if (charge) {
+            manager.chargeEnergy();
+            charge = false;
+        }
+
+        var world = engine.getWorld().realWorld();
+        if (world == null
+                || noSpawning()
+                || Boolean.FALSE.equals(world.getGameRuleValue(GameRule.DO_MOB_SPAWNING))
+                || players.isEmpty()
+                || manager.getEnergy() < 100)
+            return;
+
+        var p = PrecisionStopwatch.start();
+        var entities = new KList<>(this.entities);
+
+        var conditionCache = new KMap<UUID, KMap<String, Boolean>>();
+        var data = engine.getData();
+        var invalid = data.getSpawnerLoader()
+                .streamAllPossible()
+                .filter(Predicate.not(spawner -> spawner.canSpawn(engine)
+                        && spawner.getConditions().check(conditionCache, entities)))
+                .map(IrisSpawner::getLoadKey)
+                .collect(Collectors.toSet());
+
+        var centers = players.stream()
+                .filter(Objects::nonNull)
+                .filter(Player::isOnline)
+                .map(Player::getLocation)
+                .map(BlockPosition::fromLocation)
+                .collect(KList.collector())
+                .shuffle();
+
+        if (centers.isEmpty())
+            return;
+
+        AtomicDouble delta = new AtomicDouble();
+        int actuallySpawned = 0;
+
+        KMap<Position2, Pair<Entity[], ChunkSnapshot>> cache = new KMap<>();
+        while (centers.isNotEmpty()) {
+            var center = centers.pop();
+            var spawned = trySpawn(world, invalid, cache, center, delta);
+            if (spawned == 0 && p.getMilliseconds() < 1000)
+                centers.add(center);
+            actuallySpawned += spawned;
+        }
+        manager.setEnergy(manager.getEnergy() - delta.get());
+        if (actuallySpawned > 0) {
+            Iris.info("Async Mob Spawning " + world.getName() + " used " + delta + " energy and took " + Form.duration((long) p.getMilliseconds()));
+        }
+    }
+
+    private int trySpawn(
+            World world,
+            Set<String> invalid,
+            KMap<Position2, Pair<Entity[], ChunkSnapshot>> cache,
+            BlockPosition center,
+            AtomicDouble delta
+    ) {
+        var pos = center.randomPoint(MAX_RADIUS, SAFE_RADIUS);
+        if (pos.getY() < world.getMinHeight() || pos.getY() >= world.getMaxHeight())
+            return 0;
+
+        var chunkPos = new Position2(center.getX() >> 4, center.getZ() >> 4);
+        var pair = cache.computeIfAbsent(chunkPos, cPos -> {
+            try {
+                return PaperLib.getChunkAtAsync(world, cPos.getX(), cPos.getZ(), false)
+                        .thenApply(c -> c != null ? new Pair<>(c.getEntities(), c.getChunkSnapshot(false, false, false)) : null)
+                        .get();
+            } catch (InterruptedException | ExecutionException e) {
+                throw new RuntimeException(e);
+            }
+        });
+        if (pair == null)
+            return 0;
+
+        var spawners = spawnersAt(pair.getB(), pos, invalid);
+        spawners.removeIf(i -> !i.canSpawn(engine, chunkPos.getX(), chunkPos.getZ()));
+
+        if (spawners.isEmpty())
+            return 0;
+
+        IrisPosition irisPos = new IrisPosition(pos.getX(), pos.getY(), pos.getZ());
+        for (var spawner : spawners) {
+            var spawns = spawner.getSpawns().copy();
+            spawns.removeIf(spawn -> !spawn.check(engine, irisPos, pair.getB()));
+
+            var entity = IRare.pick(spawns, RNG.r.nextDouble());
+            if (entity == null)
+                continue;
+
+            entity.setReferenceSpawner(spawner);
+            entity.setReferenceMarker(spawner.getReferenceMarker());
+            int spawned = entity.spawn(engine, irisPos, RNG.r);
+            if (spawned == 0)
+                continue;
+
+            delta.addAndGet(spawned * ((entity.getEnergyMultiplier() * spawner.getEnergyMultiplier() * 1)));
+            spawner.spawn(engine, chunkPos.getX(), chunkPos.getZ());
+            if (!spawner.canSpawn(engine))
+                invalid.add(spawner.getLoadKey());
+            return spawned;
+        }
+        return 0;
+    }
+
+    private KSet<IrisSpawner> spawnersAt(ChunkSnapshot chunk, BlockPosition pos, Set<String> invalid) {
+        KSet<IrisSpawner> spawners = markerAt(chunk, pos, invalid);
+
+        var loader = engine.getData().getSpawnerLoader();
+        int y = pos.getY() - engine.getWorld().minHeight();
+        Stream.concat(engine.getRegion(pos.getX(), pos.getZ())
+                                .getEntitySpawners()
+                                .stream(),
+                        engine.getBiomeOrMantle(pos.getX(), y, pos.getZ())
+                                .getEntitySpawners()
+                                .stream())
+                .filter(Predicate.not(invalid::contains))
+                .map(loader::load)
+                .forEach(spawners::add);
+
+        return spawners;
+    }
+
+    private KSet<IrisSpawner> markerAt(ChunkSnapshot chunk, BlockPosition pos, Set<String> invalid) {
+        if (!IrisSettings.get().getWorld().isMarkerEntitySpawningSystem())
+            return new KSet<>();
+
+        int y = pos.getY() - engine.getWorld().minHeight();
+        Mantle mantle = engine.getMantle().getMantle();
+        MatterMarker matter = mantle.get(pos.getX(), y, pos.getZ(), MatterMarker.class);
+        if (matter == null || CAVE_TAGS.contains(matter.getTag()))
+            return new KSet<>();
+        IrisData data = engine.getData();
+        IrisMarker mark = data.getMarkerLoader().load(matter.getTag());
+        if (mark == null)
+            return new KSet<>();
+
+        if (mark.isEmptyAbove()) {
+            int x = pos.getX() & 15, z = pos.getZ() & 15;
+            boolean remove = chunk.getBlockData(x, pos.getY() + 1, z).getMaterial().isSolid() || chunk.getBlockData(x, pos.getY() + 2, z).getMaterial().isSolid();
+            if (remove) {
+                mantle.remove(pos.getX(), y, pos.getZ(), MatterMarker.class);
+                return new KSet<>();
+            }
+        }
+
+        KSet<IrisSpawner> spawners = new KSet<>();
+        for (String key : mark.getSpawners()) {
+            if (invalid.contains(key))
+                continue;
+
+            IrisSpawner spawner = data.getSpawnerLoader().load(key);
+            if (spawner == null) {
+                Iris.error("Cannot load spawner: " + key + " for marker " + matter.getTag());
+                continue;
+            }
+
+            spawner.setReferenceMarker(mark);
+            spawners.add(spawner);
+        }
+        return spawners;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void on(PlayerJoinEvent event) {
+        var player = event.getPlayer();
+        if (player.getWorld() != engine.getWorld().realWorld())
+            return;
+        players.add(player);
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST)
+    public void on(PlayerQuitEvent event) {
+        players.remove(event.getPlayer());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void on(PlayerChangedWorldEvent event) {
+        var player = event.getPlayer();
+        if (player.getWorld() == engine.getWorld().realWorld())
+            players.add(player);
+        else
+            players.remove(player);
+    }
+
+    @SneakyThrows
+    private static void cancel(Thread thread) {
+        if (thread == null || !thread.isAlive()) return;
+        thread.interrupt();
+        thread.join();
+    }
+
+    private static boolean noSpawning() {
+        var world = IrisSettings.get().getWorld();
+        return !world.isMarkerEntitySpawningSystem() && !world.isAnbientEntitySpawningSystem();
+    }
+
+    private boolean mayLoop() {
+        return !engine.isClosed() && running.get() && !Thread.interrupted();
+    }
+
+    private static boolean isInterrupted(Throwable e) {
+        while (e != null) {
+            if (e instanceof InterruptedException)
+                return true;
+            e = e.getCause();
+        }
+        return false;
+    }
+}

core/src/main/java/com/volmit/iris/engine/service/EngineStatusSVC.java

@@ -0,0 +1,65 @@
+package com.volmit.iris.engine.service;
+
+import com.volmit.iris.engine.framework.Engine;
+import com.volmit.iris.engine.object.IrisEngineService;
+import com.volmit.iris.util.collection.KList;
+
+public class EngineStatusSVC extends IrisEngineService {
+    private static final KList<EngineStatusSVC> INSTANCES = new KList<>();
+
+    public EngineStatusSVC(Engine engine) {
+        super(engine);
+    }
+
+    @Override
+    public void onEnable(boolean hotload) {
+        if (hotload) return;
+        synchronized (INSTANCES) {
+            INSTANCES.add(this);
+        }
+    }
+
+    @Override
+    public void onDisable(boolean hotload) {
+        if (hotload) return;
+
+        synchronized (INSTANCES) {
+            INSTANCES.remove(this);
+        }
+    }
+
+    public static int getEngineCount() {
+        return INSTANCES.size();
+    }
+
+    public static Status getStatus() {
+        synchronized (INSTANCES) {
+            long loadedChunks = 0;
+            long tectonicPlates = 0;
+            long activeTectonicPlates = 0;
+            long queuedTectonicPlates = 0;
+            long minTectonicUnloadDuration = Long.MAX_VALUE;
+            long maxTectonicUnloadDuration = Long.MIN_VALUE;
+
+            for (var service : INSTANCES) {
+                var world = service.engine.getWorld();
+                if (world.hasRealWorld())
+                    loadedChunks += world.realWorld().getLoadedChunks().length;
+
+                tectonicPlates += service.engine.getMantle().getLoadedRegionCount();
+                activeTectonicPlates += service.engine.getMantle().getNotQueuedLoadedRegions();
+                queuedTectonicPlates += service.engine.getMantle().getToUnload();
+                minTectonicUnloadDuration = Math.min(minTectonicUnloadDuration, (long) service.engine.getMantle().getTectonicDuration());
+                maxTectonicUnloadDuration = Math.max(maxTectonicUnloadDuration, (long) service.engine.getMantle().getTectonicDuration());
+            }
+            return new Status(INSTANCES.size(), loadedChunks, MantleCleanerSVC.getTectonicLimit(), tectonicPlates, activeTectonicPlates, queuedTectonicPlates, minTectonicUnloadDuration, maxTectonicUnloadDuration);
+        }
+    }
+
+    public record Status(int engineCount, long loadedChunks, int tectonicLimit,
+                         long tectonicPlates, long activeTectonicPlates,
+                         long queuedTectonicPlates,
+                         long minTectonicUnloadDuration,
+                         long maxTectonicUnloadDuration) {
+    }
+}

core/src/main/java/com/volmit/iris/engine/service/MantleCleanerSVC.java

@@ -0,0 +1,127 @@
+package com.volmit.iris.engine.service;
+
+import com.volmit.iris.Iris;
+import com.volmit.iris.core.IrisSettings;
+import com.volmit.iris.engine.framework.Engine;
+import com.volmit.iris.engine.object.IrisEngineService;
+import com.volmit.iris.util.format.C;
+import com.volmit.iris.util.math.M;
+import com.volmit.iris.util.misc.getHardware;
+import com.volmit.iris.util.scheduling.Looper;
+import lombok.SneakyThrows;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.LongSupplier;
+
+public class MantleCleanerSVC extends IrisEngineService {
+    private static final AtomicInteger tectonicLimit = new AtomicInteger(30);
+
+    static {
+        // todo: Redo this
+        tectonicLimit.set(2);
+        long t = getHardware.getProcessMemory();
+        while (t > 200) {
+            tectonicLimit.incrementAndGet();
+            t = t - 200;
+        }
+    }
+
+    private Ticker trimmer;
+    private Ticker unloader;
+
+    public MantleCleanerSVC(Engine engine) {
+        super(engine);
+    }
+
+    public static int getTectonicLimit() {
+        return tectonicLimit.get();
+    }
+
+    private static Ticker createTrimmer(Engine engine) {
+        return new Ticker(() -> {
+            if (engine.isClosed()) return -1;
+            long start = M.ms();
+            try {
+                engine.getMantle().trim(tectonicLimit.get() / getEngineCount());
+            } catch (Throwable e) {
+                Iris.debug(C.RED + "Mantle: Failed to trim.");
+                Iris.reportError(e);
+                e.printStackTrace();
+            }
+
+            if (engine.isClosed()) return -1;
+            int size = getEngineCount();
+            return Math.max(1000 / size - (M.ms() - start), 0);
+        }, "Iris Mantle Trimmer - " + engine.getWorld().name());
+    }
+
+    private static Ticker createUnloader(Engine engine) {
+        return new Ticker(() -> {
+            if (engine.isClosed()) return -1;
+            long start = M.ms();
+            try {
+                engine.getMantle().unloadTectonicPlate(tectonicLimit.get() / getEngineCount());
+            } catch (Throwable e) {
+                Iris.debug(C.RED + "Mantle: Failed to unload.");
+                Iris.reportError(e);
+                e.printStackTrace();
+            }
+
+            if (engine.isClosed()) return -1;
+            int size = getEngineCount();
+            return Math.max(1000 / size - (M.ms() - start), 0);
+        }, "Iris Mantle Unloader - " + engine.getWorld().name());
+    }
+
+    private static int getEngineCount() {
+        return Math.max(EngineStatusSVC.getEngineCount(), 1);
+    }
+
+    @Override
+    public void onEnable(boolean hotload) {
+        if (engine.isStudio() && !IrisSettings.get().getPerformance().trimMantleInStudio)
+            return;
+        if (trimmer == null || !trimmer.isAlive())
+            trimmer = createTrimmer(engine);
+        if (unloader == null || !unloader.isAlive())
+            unloader = createUnloader(engine);
+    }
+
+    @Override
+    public void onDisable(boolean hotload) {
+        if (hotload) return;
+        if (trimmer != null) trimmer.await();
+        if (unloader != null) unloader.await();
+    }
+
+    private static class Ticker extends Looper {
+        private final LongSupplier supplier;
+
+        private Ticker(LongSupplier supplier, String name) {
+            this.supplier = supplier;
+            setPriority(Thread.MIN_PRIORITY);
+            setName(name);
+            start();
+        }
+
+        @Override
+        protected long loop() {
+            try {
+                return supplier.getAsLong();
+            } catch (Throwable e) {
+                Iris.error("Exception in Looper " + getName());
+                StringWriter sw = new StringWriter();
+                e.printStackTrace(new PrintWriter(sw));
+                Iris.error(sw.toString());
+                return 3000;
+            }
+        }
+
+        @SneakyThrows
+        public void await() {
+            join();
+        }
+    }
+}

core/src/main/java/com/volmit/iris/util/collection/KList.java

@@ -26,6 +26,8 @@ import com.volmit.iris.util.math.RNG;
 import java.util.*;
 import java.util.function.Function;
 import java.util.function.Predicate;
+import java.util.stream.Collector;
+import java.util.stream.Collectors;
 
 @SuppressWarnings("ALL")
 public class KList<T> extends ArrayList<T> implements List<T> {
@@ -65,6 +67,10 @@ public class KList<T> extends ArrayList<T> implements List<T> {
         return s;
     }
 
+    public static <T> Collector<T, ?, KList<T>> collector() {
+        return Collectors.toCollection(KList::new);
+    }
+
     public static KList<String> asStringList(List<?> oo) {
         KList<String> s = new KList<String>();
 

core/src/main/java/com/volmit/iris/util/mantle/Mantle.java

@@ -21,7 +21,6 @@ package com.volmit.iris.util.mantle;
 import com.google.common.util.concurrent.AtomicDouble;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
-import com.volmit.iris.core.service.IrisEngineSVC;
 import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.engine.data.cache.Cache;
 import com.volmit.iris.engine.framework.Engine;
@@ -425,7 +424,7 @@ public class Mantle {
         ioTrim.set(true);
         unloadLock.lock();
         try {
-            if (lastUse != null && IrisEngineSVC.instance != null) {
+            if (lastUse != null) {
                 if (!lastUse.isEmpty()) {
                     Iris.debug("Trimming Tectonic Plates older than " + Form.duration(adjustedIdleDuration.get(), 0));
                     for (long i : new ArrayList<>(lastUse.keySet())) {
@@ -435,7 +434,6 @@ public class Mantle {
                             if (lastUseTime != null && M.ms() - lastUseTime >= finalAdjustedIdleDuration) {
                                 toUnload.add(i);
                                 Iris.debug("Tectonic Region added to unload");
-                                IrisEngineSVC.instance.trimActiveAlive.reset();
                             }
                         });
                     }
@@ -454,53 +452,49 @@ public class Mantle {
         AtomicInteger i = new AtomicInteger();
         unloadLock.lock();
         BurstExecutor burst = null;
-        if (IrisEngineSVC.instance != null) {
-            try {
-                KList<Long> copy = toUnload.copy();
-                if (!disableClear) toUnload.clear();
-                burst = MultiBurst.burst.burst(copy.size());
-                burst.setMulticore(copy.size() > tectonicLimit);
-                for (int j = 0; j < copy.size(); j++) {
-                    Long id = copy.get(j);
-                    if (id == null) {
-                        Iris.error("Null id in unloadTectonicPlate at index " + j);
-                        continue;
-                    }
-
-                    burst.queue(() ->
-                            hyperLock.withLong(id, () -> {
-                                TectonicPlate m = loadedRegions.get(id);
-                                if (m != null) {
-                                    if (m.inUse()) {
-                                        Iris.debug("Tectonic Plate was added to unload while in use " + C.DARK_GREEN + m.getX() + " " + m.getZ());
-                                        if (disableClear) toUnload.remove(id);
-                                        lastUse.put(id, M.ms());
-                                        return;
-                                    }
-                                    try {
-                                        m.write(fileForRegion(dataFolder, id));
-                                        loadedRegions.remove(id);
-                                        lastUse.remove(id);
-                                        if (disableClear) toUnload.remove(id);
-                                        i.incrementAndGet();
-                                        Iris.debug("Unloaded Tectonic Plate " + C.DARK_GREEN + Cache.keyX(id) + " " + Cache.keyZ(id));
-                                        IrisEngineSVC.instance.unloadActiveAlive.reset();
-                                    } catch (IOException e) {
-                                        Iris.reportError(e);
-                                    }
-                                }
-                            }));
+        try {
+            KList<Long> copy = toUnload.copy();
+            if (!disableClear) toUnload.clear();
+            burst = MultiBurst.burst.burst(copy.size());
+            burst.setMulticore(copy.size() > tectonicLimit);
+            for (int j = 0; j < copy.size(); j++) {
+                Long id = copy.get(j);
+                if (id == null) {
+                    Iris.error("Null id in unloadTectonicPlate at index " + j);
+                    continue;
                 }
-                burst.complete();
-            } catch (Throwable e) {
-                e.printStackTrace();
-                if (burst != null)
-                    burst.complete();
-            } finally {
-                unloadLock.unlock();
-                ioTectonicUnload.set(true);
+
+                burst.queue(() ->
+                        hyperLock.withLong(id, () -> {
+                            TectonicPlate m = loadedRegions.get(id);
+                            if (m != null) {
+                                if (m.inUse()) {
+                                    Iris.debug("Tectonic Plate was added to unload while in use " + C.DARK_GREEN + m.getX() + " " + m.getZ());
+                                    if (disableClear) toUnload.remove(id);
+                                    lastUse.put(id, M.ms());
+                                    return;
+                                }
+                                try {
+                                    m.write(fileForRegion(dataFolder, id));
+                                    loadedRegions.remove(id);
+                                    lastUse.remove(id);
+                                    if (disableClear) toUnload.remove(id);
+                                    i.incrementAndGet();
+                                    Iris.debug("Unloaded Tectonic Plate " + C.DARK_GREEN + Cache.keyX(id) + " " + Cache.keyZ(id));
+                                } catch (IOException e) {
+                                    Iris.reportError(e);
+                                }
+                            }
+                        }));
             }
-            return i.get();
+            burst.complete();
+        } catch (Throwable e) {
+            e.printStackTrace();
+            if (burst != null)
+                burst.complete();
+        } finally {
+            unloadLock.unlock();
+            ioTectonicUnload.set(true);
         }
         return i.get();
     }

core/src/main/java/com/volmit/iris/util/math/BlockPosition.java

@@ -19,11 +19,14 @@
 package com.volmit.iris.util.math;
 
 import lombok.Data;
+import org.bukkit.Location;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 
 import java.util.Objects;
 
+import static com.volmit.iris.util.math.RNG.r;
+
 @Data
 public class BlockPosition {
     //Magic numbers
@@ -43,6 +46,10 @@ public class BlockPosition {
         this.z = z;
     }
 
+    public static BlockPosition fromLocation(Location loc) {
+        return new BlockPosition(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
+    }
+
     public static long toLong(int x, int y, int z) {
         long var3 = 0L;
         var3 |= (x & m4) << m3;
@@ -108,4 +115,18 @@ public class BlockPosition {
         setY(Math.max(i.getY(), getY()));
         setZ(Math.max(i.getZ(), getZ()));
     }
+
+    public BlockPosition randomPoint(int radius, int innerRadius) {
+        int max = radius * radius;
+        int min = innerRadius * innerRadius;
+
+        while (true) {
+            int x = r.nextInt(-radius, radius + 1);
+            int y = r.nextInt(-radius, radius + 1);
+            int z = r.nextInt(-radius, radius + 1);
+            double dist = x * x + y * y + z * z;
+            if (dist < min || dist > max) continue;
+            return add(x, y, z);
+        }
+    }
 }

core/src/main/java/com/volmit/iris/util/math/Spiraler.java

@@ -63,7 +63,7 @@ public class Spiraler {
 
     public void next() {
         if ((-sizeX / 2 <= x) && (x <= sizeX / 2) && (-sizeZ / 2 <= z) && (z <= sizeZ / 2)) {
-            spiraled.on(x + ox, z + ox);
+            spiraled.on(x + ox, z + oz);
         }
 
         if ((x == z) || ((x < 0) && (x == -z)) || ((x > 0) && (x == 1 - z))) {

core/src/main/java/com/volmit/iris/util/misc/ServerProperties.java

@@ -0,0 +1,44 @@
+package com.volmit.iris.util.misc;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class ServerProperties {
+    public static final Properties DATA = new Properties();
+    public static final File SERVER_PROPERTIES;
+    public static final File BUKKIT_YML;
+
+    public static final String LEVEL_NAME;
+
+    static {
+        String[] args = ProcessHandle.current()
+                .info()
+                .arguments()
+                .orElse(new String[0]);
+
+        String propertiesPath = "server.properties";
+        String bukkitYml = "bukkit.yml";
+        String levelName = null;
+
+        for (int i = 0; i < args.length - 1; i++) {
+            switch (args[i]) {
+                case "-c", "--config" -> propertiesPath = args[i + 1];
+                case "-b", "--bukkit-settings" -> bukkitYml = args[i + 1];
+                case "-w", "--level-name", "--world" -> levelName = args[i + 1];
+            }
+        }
+
+        SERVER_PROPERTIES = new File(propertiesPath);
+        BUKKIT_YML = new File(bukkitYml);
+        try (FileInputStream in = new FileInputStream(SERVER_PROPERTIES)){
+            DATA.load(in);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        if (levelName != null) LEVEL_NAME = levelName;
+        else LEVEL_NAME = DATA.getProperty("level-name", "world");
+    }
+}

core/src/main/java/com/volmit/iris/util/parallel/Sync.java

@@ -0,0 +1,20 @@
+package com.volmit.iris.util.parallel;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class Sync<T> {
+    private final AtomicReference<CompletableFuture<T>> tick = new AtomicReference<>(new CompletableFuture<>());
+
+    public void cancel(boolean mayInterruptIfRunning) {
+        tick.getAndSet(new CompletableFuture<>()).cancel(mayInterruptIfRunning);
+    }
+
+    public CompletableFuture<T> next() {
+        return tick.get();
+    }
+
+    public void advance(T value) {
+        tick.getAndSet(new CompletableFuture<>()).complete(value);
+    }
+}

nms/v1_20_R1/src/main/java/com/volmit/iris/core/nms/v1_20_R1/NMSBinding.java

@@ -2,8 +2,10 @@ package com.volmit.iris.core.nms.v1_20_R1;
 
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Lifecycle;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.nms.INMSBinding;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.engine.data.cache.AtomicCache;
 import com.volmit.iris.engine.framework.Engine;
@@ -20,27 +22,36 @@ import com.volmit.iris.util.nbt.mca.palette.*;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 import com.volmit.iris.util.scheduling.J;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
-import net.minecraft.core.BlockPos;
-import net.minecraft.core.Holder;
+import lombok.SneakyThrows;
+import net.minecraft.core.*;
 import net.minecraft.core.Registry;
-import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.nbt.*;
 import net.minecraft.nbt.Tag;
+import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.entity.EntityDimensions;
 import net.minecraft.world.level.LevelReader;
 import net.minecraft.world.level.biome.BiomeSource;
+import net.minecraft.world.level.biome.Biomes;
 import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.chunk.ChunkAccess;
 import net.minecraft.world.level.chunk.ChunkStatus;
 import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -73,11 +84,10 @@ import java.io.DataOutputStream;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Vector;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 public class NMSBinding implements INMSBinding {
 
@@ -85,9 +95,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -568,6 +580,9 @@ public class NMSBinding implements INMSBinding {
 
     public void inject(long seed, Engine engine, World world) {
         var chunkMap = ((CraftWorld)world).getHandle().getChunkSource().chunkMap;
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
         chunkMap.generator = new IrisChunkGenerator(chunkMap.generator, seed, engine, world);
     }
 
@@ -628,4 +643,105 @@ public class NMSBinding implements INMSBinding {
             }
         }
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.registryOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().registryOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.registryOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.registry(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.registryOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.getHolder(ResourceKey.create(Registries.DIMENSION_TYPE, loc)).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), Lifecycle.stable());
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.registryKeySet().forEach(key -> {
+            var value = source.get(key);
+            var info = source.lifecycle(value);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return new ResourceLocation("iris", key.location().getPath());
+    }
 }

nms/v1_20_R2/src/main/java/com/volmit/iris/core/nms/v1_20_R2/NMSBinding.java

@@ -8,21 +8,34 @@ import java.io.DataOutputStream;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Vector;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Lifecycle;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.util.scheduling.J;
+import lombok.SneakyThrows;
+import net.minecraft.core.*;
+import net.minecraft.core.Registry;
 import net.minecraft.nbt.*;
 import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -61,10 +74,6 @@ import com.volmit.iris.util.nbt.mca.palette.*;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
-import net.minecraft.core.BlockPos;
-import net.minecraft.core.Holder;
-import net.minecraft.core.Registry;
-import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
@@ -83,9 +92,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -538,6 +549,9 @@ public class NMSBinding implements INMSBinding {
 
     public void inject(long seed, Engine engine, World world) {
         var chunkMap = ((CraftWorld)world).getHandle().getChunkSource().chunkMap;
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
         chunkMap.generator = new IrisChunkGenerator(chunkMap.generator, seed, engine, world);
     }
 
@@ -630,4 +644,105 @@ public class NMSBinding implements INMSBinding {
     public static Holder<net.minecraft.world.level.biome.Biome> biomeToBiomeBase(Registry<net.minecraft.world.level.biome.Biome> registry, Biome biome) {
         return registry.getHolderOrThrow(ResourceKey.create(Registries.BIOME, CraftNamespacedKey.toMinecraft(biome.getKey())));
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.registryOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().registryOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.registryOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.registry(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.registryOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.getHolder(ResourceKey.create(Registries.DIMENSION_TYPE, loc)).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), Lifecycle.stable());
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.registryKeySet().forEach(key -> {
+            var value = source.get(key);
+            var info = source.lifecycle(value);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return new ResourceLocation("iris", key.location().getPath());
+    }
 }

nms/v1_20_R3/src/main/java/com/volmit/iris/core/nms/v1_20_R3/NMSBinding.java

@@ -8,21 +8,34 @@ import java.io.DataOutputStream;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Vector;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Lifecycle;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.util.scheduling.J;
+import lombok.SneakyThrows;
+import net.minecraft.core.*;
+import net.minecraft.core.Registry;
 import net.minecraft.nbt.*;
 import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -61,10 +74,6 @@ import com.volmit.iris.util.nbt.mca.palette.*;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
-import net.minecraft.core.BlockPos;
-import net.minecraft.core.Holder;
-import net.minecraft.core.Registry;
-import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
@@ -83,9 +92,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -538,6 +549,9 @@ public class NMSBinding implements INMSBinding {
 
     public void inject(long seed, Engine engine, World world) {
         var chunkMap = ((CraftWorld)world).getHandle().getChunkSource().chunkMap;
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
         chunkMap.generator = new IrisChunkGenerator(chunkMap.generator, seed, engine, world);
     }
 
@@ -631,4 +645,105 @@ public class NMSBinding implements INMSBinding {
     public static Holder<net.minecraft.world.level.biome.Biome> biomeToBiomeBase(Registry<net.minecraft.world.level.biome.Biome> registry, Biome biome) {
         return registry.getHolderOrThrow(ResourceKey.create(Registries.BIOME, CraftNamespacedKey.toMinecraft(biome.getKey())));
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.registryOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().registryOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.registryOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.registry(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.registryOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.getHolder(ResourceKey.create(Registries.DIMENSION_TYPE, loc)).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), Lifecycle.stable());
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.registryKeySet().forEach(key -> {
+            var value = source.get(key);
+            var info = source.lifecycle(value);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return new ResourceLocation("iris", key.location().getPath());
+    }
 }

nms/v1_20_R4/src/main/java/com/volmit/iris/core/nms/v1_20_R4/NMSBinding.java

@@ -6,12 +6,17 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Lifecycle;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 import com.volmit.iris.util.scheduling.J;
+import lombok.SneakyThrows;
 import net.minecraft.core.*;
 import net.minecraft.core.Registry;
 import net.minecraft.core.component.DataComponents;
@@ -25,15 +30,24 @@ import net.minecraft.nbt.LongTag;
 import net.minecraft.nbt.ShortTag;
 import net.minecraft.nbt.StringTag;
 import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.server.commands.data.DataCommands;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.item.component.CustomData;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.chunk.status.ChunkStatus;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -86,9 +100,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -544,6 +560,10 @@ public class NMSBinding implements INMSBinding {
 
     public void inject(long seed, Engine engine, World world) {
         var chunkMap = ((CraftWorld)world).getHandle().getChunkSource().chunkMap;
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
+
         chunkMap.generator = new IrisChunkGenerator(chunkMap.generator, seed, engine, world);
     }
 
@@ -650,4 +670,105 @@ public class NMSBinding implements INMSBinding {
 
         return keys;
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.registryOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().registryOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.registryOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.registry(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.registryOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.getHolder(ResourceKey.create(Registries.DIMENSION_TYPE, loc)).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), RegistrationInfo.BUILT_IN);
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.registryKeySet().forEach(key -> {
+            var value = source.get(key);
+            var info = source.registrationInfo(key).orElse(null);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return new ResourceLocation("iris", key.location().getPath());
+    }
 }

nms/v1_21_R1/src/main/java/com/volmit/iris/core/nms/v1_21_R1/NMSBinding.java

@@ -10,22 +10,38 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 import com.mojang.datafixers.util.Pair;
+import com.mojang.serialization.Lifecycle;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
 import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.util.scheduling.J;
+import lombok.SneakyThrows;
+import net.minecraft.core.*;
+import net.minecraft.core.Registry;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.nbt.*;
 import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.server.level.ChunkMap;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.item.component.CustomData;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.chunk.status.ChunkStatus;
 import net.minecraft.world.level.chunk.status.WorldGenContext;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -64,10 +80,6 @@ import com.volmit.iris.util.nbt.mca.palette.*;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
-import net.minecraft.core.BlockPos;
-import net.minecraft.core.Holder;
-import net.minecraft.core.Registry;
-import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
@@ -85,9 +97,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -546,6 +560,9 @@ public class NMSBinding implements INMSBinding {
         var worldGenContextField = getField(chunkMap.getClass(), WorldGenContext.class);
         worldGenContextField.setAccessible(true);
         var worldGenContext = (WorldGenContext) worldGenContextField.get(chunkMap);
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
 
         var newContext = new WorldGenContext(
                 worldGenContext.level(), new IrisChunkGenerator(worldGenContext.generator(), seed, engine, world),
@@ -657,4 +674,105 @@ public class NMSBinding implements INMSBinding {
 
         return keys;
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.registryOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().registryOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().K.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.registryOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.registry(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.registryOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.getHolder(ResourceKey.create(Registries.DIMENSION_TYPE, loc)).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), RegistrationInfo.BUILT_IN);
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.registryKeySet().forEach(key -> {
+            var value = source.get(key);
+            var info = source.registrationInfo(key).orElse(null);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return ResourceLocation.fromNamespaceAndPath("iris", key.location().getPath());
+    }
 }

nms/v1_21_R2/src/main/java/com/volmit/iris/core/nms/v1_21_R2/NMSBinding.java

@@ -6,22 +6,37 @@ import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
+import com.mojang.serialization.Lifecycle;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
+import com.volmit.iris.core.nms.container.Pair;
 import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.util.scheduling.J;
+import lombok.SneakyThrows;
 import net.minecraft.core.*;
 import net.minecraft.core.Registry;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.nbt.*;
 import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.item.component.CustomData;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.chunk.status.ChunkStatus;
 import net.minecraft.world.level.chunk.status.WorldGenContext;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -72,9 +87,11 @@ public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -533,6 +550,9 @@ public class NMSBinding implements INMSBinding {
         var worldGenContextField = getField(chunkMap.getClass(), WorldGenContext.class);
         worldGenContextField.setAccessible(true);
         var worldGenContext = (WorldGenContext) worldGenContextField.get(chunkMap);
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
 
         var newContext = new WorldGenContext(
                 worldGenContext.level(), new IrisChunkGenerator(worldGenContext.generator(), seed, engine, world),
@@ -644,4 +664,105 @@ public class NMSBinding implements INMSBinding {
 
         return keys;
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.lookupOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().lookupOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().L.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.lookupOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.lookup(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.lookupOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.get(loc).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), RegistrationInfo.BUILT_IN);
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.listElementIds().forEach(key -> {
+            var value = source.getValue(key);
+            var info = source.registrationInfo(key).orElse(null);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return ResourceLocation.fromNamespaceAndPath("iris", key.location().getPath());
+    }
 }

nms/v1_21_R3/src/main/java/com/volmit/iris/core/nms/v1_21_R3/IrisChunkGenerator.java

@@ -209,7 +209,7 @@ public class IrisChunkGenerator extends CustomChunkGenerator {
 
     @Override
     public WeightedRandomList<MobSpawnSettings.SpawnerData> getMobsAt(Holder<Biome> holder, StructureManager structuremanager, MobCategory enumcreaturetype, BlockPos blockposition) {
-        return delegate.getMobsAt(holder, structuremanager, enumcreaturetype, blockposition);
+        return WeightedRandomList.create();
     }
 
     @Override

nms/v1_21_R3/src/main/java/com/volmit/iris/core/nms/v1_21_R3/NMSBinding.java

@@ -1,9 +1,12 @@
 package com.volmit.iris.core.nms.v1_21_R3;
 
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import com.mojang.serialization.Lifecycle;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.nms.INMSBinding;
+import com.volmit.iris.core.nms.container.AutoClosing;
 import com.volmit.iris.core.nms.container.BiomeColor;
+import com.volmit.iris.core.nms.container.Pair;
 import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.engine.data.cache.AtomicCache;
 import com.volmit.iris.engine.framework.Engine;
@@ -19,6 +22,7 @@ import com.volmit.iris.util.nbt.mca.palette.*;
 import com.volmit.iris.util.nbt.tag.CompoundTag;
 import com.volmit.iris.util.scheduling.J;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
+import lombok.SneakyThrows;
 import net.minecraft.core.Registry;
 import net.minecraft.core.*;
 import net.minecraft.core.component.DataComponents;
@@ -27,13 +31,17 @@ import net.minecraft.nbt.Tag;
 import net.minecraft.nbt.*;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldLoader;
 import net.minecraft.server.commands.data.BlockDataAccessor;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.item.component.CustomData;
 import net.minecraft.world.level.LevelReader;
+import net.minecraft.world.level.biome.Biomes;
 import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
@@ -41,6 +49,11 @@ import net.minecraft.world.level.chunk.ChunkAccess;
 import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.world.level.chunk.status.ChunkStatus;
 import net.minecraft.world.level.chunk.status.WorldGenContext;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.FlatLevelSource;
+import net.minecraft.world.level.levelgen.flat.FlatLayerInfo;
+import net.minecraft.world.level.levelgen.flat.FlatLevelGeneratorSettings;
 import org.bukkit.*;
 import org.bukkit.block.Biome;
 import org.bukkit.block.data.BlockData;
@@ -66,14 +79,18 @@ import java.lang.reflect.Modifier;
 import java.util.List;
 import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 public class NMSBinding implements INMSBinding {
     private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
     private final BlockData AIR = Material.AIR.createBlockData();
     private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<WorldLoader.DataLoadContext> dataLoadContext = new AtomicCache<>();
     private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
     private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
     private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final ReentrantLock dataContextLock = new ReentrantLock(true);
     private final AtomicCache<Method> byIdRef = new AtomicCache<>();
     private Field biomeStorageCache = null;
 
@@ -532,6 +549,9 @@ public class NMSBinding implements INMSBinding {
         var worldGenContextField = getField(chunkMap.getClass(), WorldGenContext.class);
         worldGenContextField.setAccessible(true);
         var worldGenContext = (WorldGenContext) worldGenContextField.get(chunkMap);
+        var dimensionType = chunkMap.level.dimensionTypeRegistration().unwrapKey().orElse(null);
+        if (dimensionType != null && !dimensionType.location().getNamespace().equals("iris"))
+            Iris.error("Loaded world %s with invalid dimension type! (%s)", world.getName(), dimensionType.location().toString());
 
         var newContext = new WorldGenContext(
                 worldGenContext.level(), new IrisChunkGenerator(worldGenContext.generator(), seed, engine, world),
@@ -643,4 +663,105 @@ public class NMSBinding implements INMSBinding {
 
         return keys;
     }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectLevelStems() {
+        if (!dataContextLock.tryLock()) throw new IllegalStateException("Failed to inject data context!");
+
+        var server = ((CraftServer) Bukkit.getServer());
+        var field = getField(MinecraftServer.class, WorldLoader.DataLoadContext.class);
+        var nmsServer = server.getServer();
+        var old = nmsServer.worldLoader;
+
+        field.setAccessible(true);
+        field.set(nmsServer, dataLoadContext.aquire(() -> new WorldLoader.DataLoadContext(
+                old.resources(),
+                old.dataConfiguration(),
+                old.datapackWorldgen(),
+                createRegistryAccess(old.datapackDimensions(), false, true, true, true)
+        )));
+
+        return new AutoClosing(() -> {
+            field.set(nmsServer, old);
+            dataContextLock.unlock();
+        });
+    }
+
+    @Override
+    @SneakyThrows
+    public AutoClosing injectUncached(boolean overworld, boolean nether, boolean end) {
+        var reg = registry();
+        var field = getField(RegistryAccess.ImmutableRegistryAccess.class, Map.class);
+        field.setAccessible(true);
+
+        var access = createRegistryAccess(((CraftServer) Bukkit.getServer()).getServer().worldLoader.datapackDimensions(), true, overworld, nether, end);
+        var injected = access.lookupOrThrow(Registries.LEVEL_STEM);
+        var old = (Map<ResourceKey<? extends Registry<?>>, Registry<?>>) field.get(reg);
+        var fake = new HashMap<>(old);
+        fake.put(Registries.LEVEL_STEM, injected);
+        field.set(reg, fake);
+
+        return new AutoClosing(() -> field.set(reg, old));
+    }
+
+    @Override
+    public boolean missingDimensionTypes(boolean overworld, boolean nether, boolean end) {
+        var registry = registry().lookupOrThrow(Registries.DIMENSION_TYPE);
+        if (overworld) overworld = !registry.containsKey(createIrisKey(LevelStem.OVERWORLD));
+        if (nether) nether = !registry.containsKey(createIrisKey(LevelStem.NETHER));
+        if (end) end = !registry.containsKey(createIrisKey(LevelStem.END));
+        return overworld || nether || end;
+    }
+
+    @Override
+    public void removeCustomDimensions(World world) {
+        ((CraftWorld) world).getHandle().L.customDimensions = null;
+    }
+
+    private RegistryAccess.Frozen createRegistryAccess(RegistryAccess.Frozen datapack, boolean copy, boolean overworld, boolean nether, boolean end) {
+        var access = registry();
+        var dimensions = access.lookupOrThrow(Registries.DIMENSION_TYPE);
+
+        var settings = new FlatLevelGeneratorSettings(
+                Optional.empty(),
+                access.lookupOrThrow(Registries.BIOME).getOrThrow(Biomes.THE_VOID),
+                List.of()
+        );
+        settings.getLayersInfo().add(new FlatLayerInfo(1, Blocks.AIR));
+        settings.updateLayers();
+
+        var source = new FlatLevelSource(settings);
+        var fake = new MappedRegistry<>(Registries.LEVEL_STEM, Lifecycle.experimental());
+        if (overworld) register(fake, dimensions, source, LevelStem.OVERWORLD);
+        if (nether) register(fake, dimensions, source, LevelStem.NETHER);
+        if (end) register(fake, dimensions, source, LevelStem.END);
+        copy(fake, datapack.lookup(Registries.LEVEL_STEM).orElse(null));
+
+        if (copy) copy(fake, access.lookupOrThrow(Registries.LEVEL_STEM));
+
+        return new RegistryAccess.Frozen.ImmutableRegistryAccess(List.of(fake)).freeze();
+    }
+
+    private void register(MappedRegistry<LevelStem> target, Registry<DimensionType> dimensions, FlatLevelSource source, ResourceKey<LevelStem> key) {
+        var loc = createIrisKey(key);
+        target.register(key, new LevelStem(
+                dimensions.get(loc).orElseThrow(() -> new IllegalStateException("Missing dimension type " + loc + " in " + dimensions.keySet())),
+                source
+        ), RegistrationInfo.BUILT_IN);
+    }
+
+    private void copy(MappedRegistry<LevelStem> target, Registry<LevelStem> source) {
+        if (source == null) return;
+        source.listElementIds().forEach(key -> {
+            var value = source.getValue(key);
+            var info = source.registrationInfo(key).orElse(null);
+            if (value != null && info != null && !target.containsKey(key))
+                target.register(key, value, info);
+        });
+    }
+
+    private ResourceLocation createIrisKey(ResourceKey<LevelStem> key) {
+        return ResourceLocation.fromNamespaceAndPath("iris", key.location().getPath());
+    }
 }