Add custom block textures

16 files changed, 537 insertions, 13 deletions

diff --git a/build.gradle.kts b/build.gradle.kts
index 6e766fa..24b263e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -139,6 +139,7 @@ dependencies {
     modRuntimeOnly(libs.fabric.api.deprecated)
     modApi(libs.architectury)
     modCompileOnly(libs.jarvis.api)
+    modCompileOnly(libs.sodium)
     include(libs.jarvis.fabric)
 
     modCompileOnly(libs.femalegender)
diff --git a/docs/Texture Pack Format.md b/docs/Texture Pack Format.md
index 859252f..4726e53 100644
--- a/docs/Texture Pack Format.md
+++ b/docs/Texture Pack Format.md
@@ -465,3 +465,54 @@ to avoid collisions with other texture packs that might use the same id for a sc
 Currently, the only supported filter is `title`, which accepts a [string matcher](#string-matcher). You can also use
 `firmament:always` as an always on filter (this is the recommended way).
 
+## Block Model Replacements
+
+If you want to replace block textures in the world you can do so using block overrides. Those are stored in 
+`assets/firmskyblock/overrides/blocks/<id>.json`. The id does not matter, all overrides are loaded. This file specifies
+which block models are replaced under which conditions:
+
+```json
+{
+    "modes": [
+        "mining_3"
+    ],
+    "area": [
+        {
+            "min": [
+                -31,
+                200,
+                -117
+            ],
+            "max": [
+                12,
+                223,
+                -95
+            ]
+        }
+    ],
+    "replacements": {
+        "minecraft:blue_wool": "firmskyblock:mithril_deep",
+        "minecraft:light_blue_wool": {
+            "block": "firmskyblock:mithril_deep",
+            "sound": "minecraft:block.wet_sponge.hit"
+        }
+    }
+}
+```
+
+| Field                   | Required | Description                                                                                                                                                                                                                                                     |
+|-------------------------|----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `modes`                 | yes      | A list of `/locraw` mode names.                                                                                                                                                                                                                                 |
+| `area`                  | no       | A list of areas. Blocks outside of the coordinate range will be ignored. If the block is in *any* range it will be considered inside                                                                                                                            |
+| `area.min`              | yes      | The lowest coordinate in the area. Is included in the area.                                                                                                                                                                                                     |
+| `area.max`              | yes      | The highest coordinate in the area. Is included in the area.                                                                                                                                                                                                    |
+| `replacements`          | yes      | A map of block id to replacement mappings                                                                                                                                                                                                                       |
+| `replacements` (string) | yes      | You can directly specify a string. Equivalent to just setting `replacements.block`.                                                                                                                                                                             |
+| `replacements.block`    | yes      | You can specify a block model to be used instead of the regular one. The model will be loaded from `assets/<namespace>/models/block/<path>.json` like regular block models.                                                                                     |
+| `replacements.sound`    | no       | You can also specify a sound override. This is only used for the "hit" sound effect that repeats while the block is mined. The "break" sound effect played after a block was finished mining is sadly sent by hypixel directly and cannot be replaced reliably. |
+
+> A quick note about optimization: Not specifying an area (by just omitting the `area` field) is quicker than having an
+> area encompass the entire map.
+> 
+> If you need to use multiple `area`s for unrelated sections of the world it might be a performance improvement to move
+> unrelated models to different files to reduce the amount of area checks being done for each block.
diff --git a/src/main/java/moe/nea/firmament/mixins/CustomModelBakerPatch.java b/src/main/java/moe/nea/firmament/mixins/CustomModelBakerPatch.java
index 97f81b0..c1e359d 100644
--- a/src/main/java/moe/nea/firmament/mixins/CustomModelBakerPatch.java
+++ b/src/main/java/moe/nea/firmament/mixins/CustomModelBakerPatch.java
@@ -1,5 +1,3 @@
-
-
 package moe.nea.firmament.mixins;
 
 import moe.nea.firmament.events.BakeExtraModelsEvent;
@@ -10,6 +8,7 @@ import net.minecraft.util.Identifier;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
@@ -29,9 +28,19 @@ public abstract class CustomModelBakerPatch {
     @Shadow
     abstract UnbakedModel getOrLoadModel(Identifier id);
 
+    @Shadow
+    protected abstract void add(ModelIdentifier id, UnbakedModel model);
+
+    @Unique
+    private void loadNonItemModel(ModelIdentifier identifier) {
+        UnbakedModel unbakedModel = this.getOrLoadModel(identifier.id());
+        this.add(identifier, unbakedModel);
+    }
+
+
     @Inject(method = "bake", at = @At("HEAD"))
     public void onBake(ModelLoader.SpriteGetter spliteGetter, CallbackInfo ci) {
-        BakeExtraModelsEvent.Companion.publish(new BakeExtraModelsEvent(this::loadItemModel));
+        BakeExtraModelsEvent.Companion.publish(new BakeExtraModelsEvent(this::loadItemModel, this::loadNonItemModel));
         modelsToBake.values().forEach(model -> model.setParents(this::getOrLoadModel));
 //        modelsToBake.keySet().stream()
 //            .filter(it -> !it.id().getNamespace().equals("minecraft"))
diff --git a/src/main/java/moe/nea/firmament/mixins/custommodels/PatchBlockModelInSodiumChunkGenerator.java b/src/main/java/moe/nea/firmament/mixins/custommodels/PatchBlockModelInSodiumChunkGenerator.java
new file mode 100644
index 0000000..90f20bc
--- /dev/null
+++ b/src/main/java/moe/nea/firmament/mixins/custommodels/PatchBlockModelInSodiumChunkGenerator.java
@@ -0,0 +1,29 @@
+package moe.nea.firmament.mixins.custommodels;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.llamalad7.mixinextras.sugar.Local;
+import me.jellysquid.mods.sodium.client.render.chunk.compile.tasks.ChunkBuilderMeshingTask;
+import moe.nea.firmament.features.texturepack.CustomBlockTextures;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.block.BlockModels;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(ChunkBuilderMeshingTask.class)
+public class PatchBlockModelInSodiumChunkGenerator {
+    @WrapOperation(
+        method = "execute(Lme/jellysquid/mods/sodium/client/render/chunk/compile/ChunkBuildContext;Lme/jellysquid/mods/sodium/client/util/task/CancellationToken;)Lme/jellysquid/mods/sodium/client/render/chunk/compile/ChunkBuildOutput;",
+        at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/block/BlockModels;getModel(Lnet/minecraft/block/BlockState;)Lnet/minecraft/client/render/model/BakedModel;"))
+    private BakedModel replaceBlockModel(BlockModels instance, BlockState state, Operation<BakedModel> original,
+                                         @Local(name = "blockPos") BlockPos.Mutable pos) {
+        var replacement = CustomBlockTextures.getReplacementModel(state, pos);
+        if (replacement != null) return replacement;
+        CustomBlockTextures.enterFallbackCall();
+        var fallback = original.call(instance, state);
+        CustomBlockTextures.exitFallbackCall();
+        return fallback;
+    }
+}
diff --git a/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockBreakSoundPatch.java b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockBreakSoundPatch.java
new file mode 100644
index 0000000..9401889
--- /dev/null
+++ b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockBreakSoundPatch.java
@@ -0,0 +1,27 @@
+package moe.nea.firmament.mixins.custommodels;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.llamalad7.mixinextras.sugar.Local;
+import moe.nea.firmament.features.texturepack.CustomBlockTextures;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.sound.BlockSoundGroup;
+import net.minecraft.sound.SoundEvent;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(WorldRenderer.class)
+public class ReplaceBlockBreakSoundPatch {
+// Sadly hypixel does not send a world event here and instead plays the sound on the server directly
+//    @WrapOperation(method = "processWorldEvent", at = @At(value = "INVOKE", target = "Lnet/minecraft/sound/BlockSoundGroup;getBreakSound()Lnet/minecraft/sound/SoundEvent;"))
+//    private SoundEvent replaceBreakSoundEvent(BlockSoundGroup instance, Operation<SoundEvent> original,
+//                                              @Local(argsOnly = true) BlockPos pos, @Local BlockState blockState) {
+//        var replacement = CustomBlockTextures.getReplacement(blockState, pos);
+//        if (replacement != null && replacement.getSound() != null) {
+//            return SoundEvent.of(replacement.getSound());
+//        }
+//        return original.call(instance);
+//    }
+}
diff --git a/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockHitSoundPatch.java b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockHitSoundPatch.java
new file mode 100644
index 0000000..f9a1d0d
--- /dev/null
+++ b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockHitSoundPatch.java
@@ -0,0 +1,30 @@
+package moe.nea.firmament.mixins.custommodels;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.llamalad7.mixinextras.sugar.Local;
+import moe.nea.firmament.features.texturepack.CustomBlockTextures;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.network.ClientPlayerInteractionManager;
+import net.minecraft.client.sound.PositionedSoundInstance;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.sound.SoundEvent;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.random.Random;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(ClientPlayerInteractionManager.class)
+public class ReplaceBlockHitSoundPatch {
+    @WrapOperation(method = "updateBlockBreakingProgress", at = @At(value = "NEW", target = "(Lnet/minecraft/sound/SoundEvent;Lnet/minecraft/sound/SoundCategory;FFLnet/minecraft/util/math/random/Random;Lnet/minecraft/util/math/BlockPos;)Lnet/minecraft/client/sound/PositionedSoundInstance;"))
+    private PositionedSoundInstance replaceSound(
+        SoundEvent sound, SoundCategory category, float volume, float pitch,
+        Random random, BlockPos pos, Operation<PositionedSoundInstance> original,
+        @Local BlockState blockState) {
+        var replacement = CustomBlockTextures.getReplacement(blockState, pos);
+        if (replacement != null && replacement.getSound() != null) {
+            sound = SoundEvent.of(replacement.getSound());
+        }
+        return original.call(sound, category, volume, pitch, random, pos);
+    }
+}
diff --git a/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockRenderManagerBlockModel.java b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockRenderManagerBlockModel.java
new file mode 100644
index 0000000..711b2af
--- /dev/null
+++ b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceBlockRenderManagerBlockModel.java
@@ -0,0 +1,38 @@
+package moe.nea.firmament.mixins.custommodels;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.llamalad7.mixinextras.sugar.Local;
+import moe.nea.firmament.features.texturepack.CustomBlockTextures;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.block.BlockModels;
+import net.minecraft.client.render.block.BlockRenderManager;
+import net.minecraft.client.render.model.BakedModel;
+import net.minecraft.util.math.BlockPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(BlockRenderManager.class)
+public class ReplaceBlockRenderManagerBlockModel {
+    @WrapOperation(method = "renderBlock", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/block/BlockRenderManager;getModel(Lnet/minecraft/block/BlockState;)Lnet/minecraft/client/render/model/BakedModel;"))
+    private BakedModel replaceModelInRenderBlock(
+        BlockRenderManager instance, BlockState state, Operation<BakedModel> original, @Local(argsOnly = true) BlockPos pos) {
+        var replacement = CustomBlockTextures.getReplacementModel(state, pos);
+        if (replacement != null) return replacement;
+        CustomBlockTextures.enterFallbackCall();
+        var fallback = original.call(instance, state);
+        CustomBlockTextures.exitFallbackCall();
+        return fallback;
+    }
+
+    @WrapOperation(method = "renderDamage", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/render/block/BlockModels;getModel(Lnet/minecraft/block/BlockState;)Lnet/minecraft/client/render/model/BakedModel;"))
+    private BakedModel replaceModelInRenderDamage(
+        BlockModels instance, BlockState state, Operation<BakedModel> original, @Local(argsOnly = true) BlockPos pos) {
+        var replacement = CustomBlockTextures.getReplacementModel(state, pos);
+        if (replacement != null) return replacement;
+        CustomBlockTextures.enterFallbackCall();
+        var fallback = original.call(instance, state);
+        CustomBlockTextures.exitFallbackCall();
+        return fallback;
+    }
+}
diff --git a/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceFallbackBlockModel.java b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceFallbackBlockModel.java
new file mode 100644
index 0000000..53ab74a
--- /dev/null
+++ b/src/main/java/moe/nea/firmament/mixins/custommodels/ReplaceFallbackBlockModel.java
@@ -0,0 +1,21 @@
+package moe.nea.firmament.mixins.custommodels;
+
+import moe.nea.firmament.features.texturepack.CustomBlockTextures;
+import net.minecraft.block.BlockState;
+import net.minecraft.client.render.block.BlockModels;
+import net.minecraft.client.render.model.BakedModel;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(BlockModels.class)
+public class ReplaceFallbackBlockModel {
+    // TODO: add check to BlockDustParticle
+    @Inject(method = "getModel", at = @At("HEAD"), cancellable = true)
+    private void getModel(BlockState state, CallbackInfoReturnable<BakedModel> cir) {
+        var replacement = CustomBlockTextures.getReplacementModel(state, null);
+        if (replacement != null)
+            cir.setReturnValue(replacement);
+    }
+}
diff --git a/src/main/kotlin/moe/nea/firmament/events/BakeExtraModelsEvent.kt b/src/main/kotlin/moe/nea/firmament/events/BakeExtraModelsEvent.kt
index db073e3..f75bedc 100644
--- a/src/main/kotlin/moe/nea/firmament/events/BakeExtraModelsEvent.kt
+++ b/src/main/kotlin/moe/nea/firmament/events/BakeExtraModelsEvent.kt
@@ -5,11 +5,16 @@ import java.util.function.Consumer
 import net.minecraft.client.util.ModelIdentifier
 
 class BakeExtraModelsEvent(
-    private val addModel: Consumer<ModelIdentifier>,
+    private val addItemModel: Consumer<ModelIdentifier>,
+    private val addAnyModel: Consumer<ModelIdentifier>,
 ) : FirmamentEvent() {
 
-    fun addModel(modelIdentifier: ModelIdentifier) {
-        this.addModel.accept(modelIdentifier)
+    fun addNonItemModel(modelIdentifier: ModelIdentifier) {
+        this.addAnyModel.accept(modelIdentifier)
+    }
+
+    fun addItemModel(modelIdentifier: ModelIdentifier) {
+        this.addItemModel.accept(modelIdentifier)
     }
 
     companion object : FirmamentEventBus<BakeExtraModelsEvent>()
diff --git a/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomBlockTextures.kt b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomBlockTextures.kt
new file mode 100644
index 0000000..2289be2
--- /dev/null
+++ b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomBlockTextures.kt
@@ -0,0 +1,277 @@
+@file:UseSerializers(BlockPosSerializer::class, IdentifierSerializer::class)
+
+package moe.nea.firmament.features.texturepack
+
+import java.util.concurrent.CompletableFuture
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.Transient
+import kotlinx.serialization.UseSerializers
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.JsonDecoder
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.serializer
+import kotlin.jvm.optionals.getOrNull
+import net.minecraft.block.Block
+import net.minecraft.block.BlockState
+import net.minecraft.client.render.model.BakedModel
+import net.minecraft.client.util.ModelIdentifier
+import net.minecraft.registry.RegistryKey
+import net.minecraft.registry.RegistryKeys
+import net.minecraft.resource.ResourceManager
+import net.minecraft.resource.SinglePreparationResourceReloader
+import net.minecraft.util.Identifier
+import net.minecraft.util.math.BlockPos
+import net.minecraft.util.profiler.Profiler
+import moe.nea.firmament.Firmament
+import moe.nea.firmament.annotations.Subscribe
+import moe.nea.firmament.events.BakeExtraModelsEvent
+import moe.nea.firmament.events.EarlyResourceReloadEvent
+import moe.nea.firmament.events.FinalizeResourceManagerEvent
+import moe.nea.firmament.events.SkyblockServerUpdateEvent
+import moe.nea.firmament.features.texturepack.CustomGlobalTextures.logger
+import moe.nea.firmament.util.IdentifierSerializer
+import moe.nea.firmament.util.MC
+import moe.nea.firmament.util.SBData
+import moe.nea.firmament.util.SkyBlockIsland
+import moe.nea.firmament.util.json.BlockPosSerializer
+import moe.nea.firmament.util.json.SingletonSerializableList
+
+
+object CustomBlockTextures {
+    @Serializable
+    data class CustomBlockOverride(
+        val modes: @Serializable(SingletonSerializableList::class) List<String>,
+        val area: List<Area>? = null,
+        val replacements: Map<Identifier, Replacement>,
+    )
+
+    @Serializable(with = Replacement.Serializer::class)
+    data class Replacement(
+        val block: Identifier,
+        val sound: Identifier?,
+    ) {
+
+        @Transient
+        val blockModelIdentifier get() = ModelIdentifier(block.withPrefixedPath("block/"), "firmament")
+
+        @Transient
+        val bakedModel: BakedModel by lazy(LazyThreadSafetyMode.NONE) {
+            MC.instance.bakedModelManager.getModel(blockModelIdentifier)
+        }
+
+        @OptIn(ExperimentalSerializationApi::class)
+        @kotlinx.serialization.Serializer(Replacement::class)
+        object DefaultSerializer : KSerializer<Replacement>
+
+        object Serializer : KSerializer<Replacement> {
+            val delegate = serializer<JsonElement>()
+            override val descriptor: SerialDescriptor
+                get() = delegate.descriptor
+
+            override fun deserialize(decoder: Decoder): Replacement {
+                val jsonElement = decoder.decodeSerializableValue(delegate)
+                if (jsonElement is JsonPrimitive) {
+                    require(jsonElement.isString)
+                    return Replacement(Identifier.tryParse(jsonElement.content)!!, null)
+                }
+                return (decoder as JsonDecoder).json.decodeFromJsonElement(DefaultSerializer, jsonElement)
+            }
+
+            override fun serialize(encoder: Encoder, value: Replacement) {
+                encoder.encodeSerializableValue(DefaultSerializer, value)
+            }
+        }
+    }
+
+    @Serializable
+    data class Area(
+        val min: BlockPos,
+        val max: BlockPos,
+    ) {
+        @Transient
+        val realMin = BlockPos(
+            minOf(min.x, max.x),
+            minOf(min.y, max.y),
+            minOf(min.z, max.z),
+        )
+
+        @Transient
+        val realMax = BlockPos(
+            maxOf(min.x, max.x),
+            maxOf(min.y, max.y),
+            maxOf(min.z, max.z),
+        )
+
+        fun roughJoin(other: Area): Area {
+            return Area(
+                BlockPos(
+                    minOf(realMin.x, other.realMin.x),
+                    minOf(realMin.y, other.realMin.y),
+                    minOf(realMin.z, other.realMin.z),
+                ),
+                BlockPos(
+                    maxOf(realMax.x, other.realMax.x),
+                    maxOf(realMax.y, other.realMax.y),
+                    maxOf(realMax.z, other.realMax.z),
+                )
+            )
+        }
+
+        fun contains(blockPos: BlockPos): Boolean {
+            return (blockPos.x in realMin.x..realMax.x) &&
+                (blockPos.y in realMin.y..realMax.y) &&
+                (blockPos.z in realMin.z..realMax.z)
+        }
+    }
+
+    data class LocationReplacements(
+        val lookup: Map<Block, List<BlockReplacement>>
+    )
+
+    data class BlockReplacement(
+        val checks: List<Area>?,
+        val replacement: Replacement,
+    ) {
+        val roughCheck by lazy(LazyThreadSafetyMode.NONE) {
+            if (checks == null || checks.size < 3) return@lazy null
+            checks.reduce { acc, next -> acc.roughJoin(next) }
+        }
+    }
+
+    data class BakedReplacements(val data: Map<SkyBlockIsland, LocationReplacements>)
+
+    var allLocationReplacements: BakedReplacements = BakedReplacements(mapOf())
+    var currentIslandReplacements: LocationReplacements? = null
+
+    fun refreshReplacements() {
+        val location = SBData.skyblockLocation
+        val replacements =
+            if (CustomSkyBlockTextures.TConfig.enableBlockOverrides) location?.let(allLocationReplacements.data::get)
+            else null
+        val lastReplacements = currentIslandReplacements
+        currentIslandReplacements = replacements
+        if (lastReplacements != replacements) {
+            MC.nextTick {
+                MC.worldRenderer.reload()
+            }
+        }
+    }
+
+    fun matchesPosition(replacement: BlockReplacement, blockPos: BlockPos?): Boolean {
+        if (blockPos == null) return true
+        val rc = replacement.roughCheck
+        if (rc != null && !rc.contains(blockPos)) return false
+        val areas = replacement.checks
+        if (areas != null && !areas.any { it.contains(blockPos) }) return false
+        return true
+    }
+
+    @JvmStatic
+    fun getReplacementModel(block: BlockState, blockPos: BlockPos?): BakedModel? {
+        return getReplacement(block, blockPos)?.bakedModel
+    }
+
+    @JvmStatic
+    fun getReplacement(block: BlockState, blockPos: BlockPos?): Replacement? {
+        if (isInFallback() && blockPos == null) return null
+        val replacements = currentIslandReplacements?.lookup?.get(block.block) ?: return null
+        for (replacement in replacements) {
+            if (replacement.checks == null || matchesPosition(replacement, blockPos))
+                return replacement.replacement
+        }
+        return null
+    }
+
+
+    @Subscribe
+    fun onLocation(event: SkyblockServerUpdateEvent) {
+        refreshReplacements()
+    }
+
+    @Volatile
+    var preparationFuture: CompletableFuture<BakedReplacements> = CompletableFuture.completedFuture(BakedReplacements(
+        mapOf()))
+
+    val insideFallbackCall = ThreadLocal.withInitial { 0 }
+
+    @JvmStatic
+    fun enterFallbackCall() {
+        insideFallbackCall.set(insideFallbackCall.get() + 1)
+    }
+
+    fun isInFallback() = insideFallbackCall.get() > 0
+
+    @JvmStatic
+    fun exitFallbackCall() {
+        insideFallbackCall.set(insideFallbackCall.get() - 1)
+    }
+
+    @Subscribe
+    fun onEarlyReload(event: EarlyResourceReloadEvent) {
+        preparationFuture = CompletableFuture
+            .supplyAsync(
+                { prepare(event.resourceManager) }, event.preparationExecutor)
+    }
+
+    @Subscribe
+    fun bakeExtraModels(event: BakeExtraModelsEvent) {
+        preparationFuture.join().data.values
+            .flatMap { it.lookup.values }
+            .flatten()
+            .mapTo(mutableSetOf()) { it.replacement.blockModelIdentifier }
+            .forEach { event.addNonItemModel(it) }
+    }
+
+    private fun prepare(manager: ResourceManager): BakedReplacements {
+        val resources = manager.findResources("overrides/blocks") {
+            it.namespace == "firmskyblock" && it.path.endsWith(".json")
+        }
+        val map = mutableMapOf<SkyBlockIsland, MutableMap<Block, MutableList<BlockReplacement>>>()
+        for ((file, resource) in resources) {
+            val json =
+                Firmament.tryDecodeJsonFromStream<CustomBlockOverride>(resource.inputStream)
+                    .getOrElse { ex ->
+                        logger.error("Failed to load block texture override at $file", ex)
+                        continue
+                    }
+            for (mode in json.modes) {
+                val island = SkyBlockIsland.forMode(mode)
+                val islandMpa = map.getOrPut(island, ::mutableMapOf)
+                for ((blockId, replacement) in json.replacements) {
+                    val block = MC.defaultRegistries.getWrapperOrThrow(RegistryKeys.BLOCK)
+                        .getOptional(RegistryKey.of(RegistryKeys.BLOCK, blockId))
+                        .getOrNull()
+                    if (block == null) {
+                        logger.error("Failed to load block texture override at ${file}: unknown block '$blockId'")
+                        continue
+                    }
+                    val replacements = islandMpa.getOrPut(block.value(), ::mutableListOf)
+                    replacements.add(BlockReplacement(json.area, replacement))
+                }
+            }
+        }
+
+        return BakedReplacements(map.mapValues { LocationReplacements(it.value) })
+    }
+
+
+    @Subscribe
+    fun onStart(event: FinalizeResourceManagerEvent) {
+        event.resourceManager.registerReloader(object :
+                                                   SinglePreparationResourceReloader<BakedReplacements>() {
+            override fun prepare(manager: ResourceManager, profiler: Profiler): BakedReplacements {
+                return preparationFuture.join()
+            }
+
+            override fun apply(prepared: BakedReplacements, manager: ResourceManager, profiler: Profiler?) {
+                allLocationReplacements = prepared
+                refreshReplacements()
+            }
+        })
+    }
+}
diff --git a/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomGlobalTextures.kt b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomGlobalTextures.kt
index ed5981a..d64c844 100644
--- a/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomGlobalTextures.kt
+++ b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomGlobalTextures.kt
@@ -78,7 +78,7 @@ object CustomGlobalTextures : SinglePreparationResourceReloader<CustomGlobalText
     fun onBakeModels(event: BakeExtraModelsEvent) {
         for (guiClassOverride in preparationFuture.join().classes) {
             for (override in guiClassOverride.overrides) {
-                event.addModel(ModelIdentifier(override.model, "inventory"))
+                event.addItemModel(ModelIdentifier(override.model, "inventory"))
             }
         }
     }
diff --git a/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt
index 634d5c0..dec6046 100644
--- a/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt
+++ b/src/main/kotlin/moe/nea/firmament/features/texturepack/CustomSkyBlockTextures.kt
@@ -1,5 +1,3 @@
-
-
 package moe.nea.firmament.features.texturepack
 
 import com.mojang.authlib.minecraft.MinecraftProfileTexture
@@ -31,6 +29,7 @@ object CustomSkyBlockTextures : FirmamentFeature {
         val cacheDuration by integer("cache-duration", 0, 20) { 1 }
         val enableModelOverrides by toggle("model-overrides") { true }
         val enableArmorOverrides by toggle("armor-overrides") { true }
+        val enableBlockOverrides by toggle("block-overrides") { true }
     }
 
     override val config: ManagedConfig
@@ -63,7 +62,7 @@ object CustomSkyBlockTextures : FirmamentFeature {
                         "models/item/".length,
                         identifier.path.length - ".json".length),
                 ))
-            event.addModel(modelId)
+            event.addItemModel(modelId)
         }
     }
 
diff --git a/src/main/kotlin/moe/nea/firmament/util/IdentifierSerializer.kt b/src/main/kotlin/moe/nea/firmament/util/IdentifierSerializer.kt
index feea9e9..65c5b1c 100644
--- a/src/main/kotlin/moe/nea/firmament/util/IdentifierSerializer.kt
+++ b/src/main/kotlin/moe/nea/firmament/util/IdentifierSerializer.kt
@@ -3,6 +3,8 @@ package moe.nea.firmament.util
 
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.Decoder
 import kotlinx.serialization.encoding.Encoder
@@ -11,7 +13,7 @@ import net.minecraft.util.Identifier
 object IdentifierSerializer : KSerializer<Identifier> {
     val delegateSerializer = String.serializer()
     override val descriptor: SerialDescriptor
-        get() = SerialDescriptor("Identifier", delegateSerializer.descriptor)
+        get() = PrimitiveSerialDescriptor("Identifier", PrimitiveKind.STRING)
 
     override fun deserialize(decoder: Decoder): Identifier {
         return Identifier.of(decoder.decodeSerializableValue(delegateSerializer))
diff --git a/src/main/kotlin/moe/nea/firmament/util/MC.kt b/src/main/kotlin/moe/nea/firmament/util/MC.kt
index 8935766..b0d3056 100644
--- a/src/main/kotlin/moe/nea/firmament/util/MC.kt
+++ b/src/main/kotlin/moe/nea/firmament/util/MC.kt
@@ -1,11 +1,10 @@
-
-
 package moe.nea.firmament.util
 
 import io.github.moulberry.repo.data.Coordinate
 import java.util.concurrent.ConcurrentLinkedQueue
 import net.minecraft.client.MinecraftClient
 import net.minecraft.client.gui.screen.ingame.HandledScreen
+import net.minecraft.client.render.WorldRenderer
 import net.minecraft.network.packet.c2s.play.CommandExecutionC2SPacket
 import net.minecraft.registry.BuiltinRegistries
 import net.minecraft.registry.RegistryKeys
@@ -24,6 +23,9 @@ object MC {
             while (true) {
                 inGameHud.chatHud.addMessage(messageQueue.poll() ?: break)
             }
+            while (true) {
+                (nextTickTodos.poll() ?: break).invoke()
+            }
         }
     }
 
@@ -58,7 +60,14 @@ object MC {
             instance.send(block)
     }
 
+    private val nextTickTodos = ConcurrentLinkedQueue<() -> Unit>()
+    fun nextTick(function: () -> Unit) {
+        nextTickTodos.add(function)
+    }
+
+
     inline val resourceManager get() = (instance.resourceManager as ReloadableResourceManagerImpl)
+    inline val worldRenderer: WorldRenderer get() = instance.worldRenderer
     inline val networkHandler get() = player?.networkHandler
     inline val instance get() = MinecraftClient.getInstance()
     inline val keyboard get() = instance.keyboard
diff --git a/src/main/kotlin/moe/nea/firmament/util/json/BlockPosSerializer.kt b/src/main/kotlin/moe/nea/firmament/util/json/BlockPosSerializer.kt
new file mode 100644
index 0000000..144b0a0
--- /dev/null
+++ b/src/main/kotlin/moe/nea/firmament/util/json/BlockPosSerializer.kt
@@ -0,0 +1,25 @@
+package moe.nea.firmament.util.json
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.serializer
+import net.minecraft.util.math.BlockPos
+
+object BlockPosSerializer : KSerializer<BlockPos> {
+    val delegate = serializer<List<Int>>()
+
+    override val descriptor: SerialDescriptor
+        get() = SerialDescriptor("BlockPos", delegate.descriptor)
+
+    override fun deserialize(decoder: Decoder): BlockPos {
+        val list = decoder.decodeSerializableValue(delegate)
+        require(list.size == 3)
+        return BlockPos(list[0], list[1], list[2])
+    }
+
+    override fun serialize(encoder: Encoder, value: BlockPos) {
+        encoder.encodeSerializableValue(delegate, listOf(value.x, value.y, value.z))
+    }
+}
diff --git a/src/main/resources/assets/firmament/lang/en_us.json b/src/main/resources/assets/firmament/lang/en_us.json
index 05b10d5..dd514fe 100644
--- a/src/main/resources/assets/firmament/lang/en_us.json
+++ b/src/main/resources/assets/firmament/lang/en_us.json
@@ -164,6 +164,7 @@
     "firmament.config.custom-skyblock-textures.cache-duration": "Model Cache Duration",
     "firmament.config.custom-skyblock-textures.model-overrides": "Enable model overrides/predicates",
     "firmament.config.custom-skyblock-textures.armor-overrides": "Enable Armor re-texturing",
+    "firmament.config.custom-skyblock-textures.block-overrides": "Enable Block re-modelling",
     "firmament.config.custom-skyblock-textures.enabled": "Enable Custom Item Textures",
     "firmament.config.custom-skyblock-textures.skulls-enabled": "Enable Custom Placed Skull Textures",
     "firmament.config.fixes": "Fixes",