diff --git a/.gitignore b/.gitignore index 5ae1327..546f059 100644 --- a/.gitignore +++ b/.gitignore @@ -13,3 +13,4 @@ Cargo.lock flamegraph.svg perf.data perf.data.old +/valence_anvil/.asset_cache/ diff --git a/Cargo.toml b/Cargo.toml index 4f8aa5d..d63d80d 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -41,7 +41,7 @@ valence_protocol = { version = "0.1.0", path = "valence_protocol", features = [" vek = "0.15.8" [dependencies.tokio] -version = "1.21.1" +version = "1.21.2" features = ["macros", "rt-multi-thread", "net", "io-util", "sync", "time"] [dependencies.reqwest] @@ -70,6 +70,7 @@ num = "0.4.0" members = [ "valence_derive", "valence_nbt", + "valence_anvil", "valence_protocol", "valence_spatial_index", "packet_inspector", diff --git a/examples/terrain.rs b/examples/terrain.rs index b31c291..195a53e 100644 --- a/examples/terrain.rs +++ b/examples/terrain.rs @@ -171,7 +171,7 @@ impl Config for Game { let mut in_terrain = false; let mut depth = 0; - for y in (0..chunk.height()).rev() { + for y in (0..chunk.section_count() * 16).rev() { let b = terrain_column( self, block_x, @@ -184,7 +184,7 @@ impl Config for Game { } // Add grass - for y in (0..chunk.height()).rev() { + for y in (0..chunk.section_count() * 16).rev() { if chunk.block_state(x, y, z).is_air() && chunk.block_state(x, y - 1, z) == BlockState::GRASS_BLOCK { diff --git a/extracted/biomes.json b/extracted/biomes.json new file mode 100644 index 0000000..cd5eb54 --- /dev/null +++ b/extracted/biomes.json @@ -0,0 +1,6994 @@ +[ + { + "name": "the_void", + "id": 0, + "element": { + "precipitation": "none", + "temperature": 0.5, + "downfall": 0.5, + "effects": { + "sky_color": 8103167, + "water_fog_color": 329011, + "fog_color": 12638463, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + }, + { + "name": "plains", + "id": 1, + "element": { + "precipitation": "rain", + "temperature": 0.8, + "downfall": 0.4, + "effects": { + "sky_color": 7907327, + "water_fog_color": 329011, + "fog_color": 12638463, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "spider", + "min_group_size": 4, + "max_group_size": 4, + "weight": 100 + }, + { + "name": "zombie", + "min_group_size": 4, + "max_group_size": 4, + "weight": 95 + }, + { + "name": "zombie_villager", + "min_group_size": 1, + "max_group_size": 1, + "weight": 5 + }, + { + "name": "skeleton", + "min_group_size": 4, + "max_group_size": 4, + "weight": 100 + }, + { + "name": "creeper", + "min_group_size": 4, + "max_group_size": 4, + "weight": 100 + }, + { + "name": "slime", + "min_group_size": 4, + "max_group_size": 4, + "weight": 100 + }, + { + "name": "enderman", + "min_group_size": 1, + "max_group_size": 4, + "weight": 10 + }, + { + "name": "witch", + "min_group_size": 1, + "max_group_size": 1, + "weight": 5 + } + ], + "creature": [ + { + "name": "sheep", + "min_group_size": 4, + "max_group_size": 4, + "weight": 12 + }, + { + "name": "pig", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + }, + { + "name": "chicken", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + }, + { + "name": "cow", + "min_group_size": 4, + "max_group_size": 4, + "weight": 8 + }, + { + "name": "horse", + "min_group_size": 2, + "max_group_size": 6, + "weight": 5 + }, + { + "name": "donkey", + "min_group_size": 1, + "max_group_size": 3, + "weight": 1 + } + ], + "ambient": [ + { + "name": "bat", + "min_group_size": 8, + "max_group_size": 8, + "weight": 10 + 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10518688, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "enderman", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + } + ], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + }, + { + "name": "end_highlands", + "id": 59, + "element": { + "precipitation": "none", + "temperature": 0.5, + "downfall": 0.5, + "effects": { + "sky_color": 0, + "water_fog_color": 329011, + "fog_color": 10518688, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "enderman", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + } + ], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + }, + { + "name": "end_midlands", + "id": 60, + "element": { + "precipitation": "none", + "temperature": 0.5, + "downfall": 0.5, + "effects": { + "sky_color": 0, + "water_fog_color": 329011, + "fog_color": 10518688, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "enderman", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + } + ], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + }, + { + "name": "small_end_islands", + "id": 61, + "element": { + "precipitation": "none", + "temperature": 0.5, + "downfall": 0.5, + "effects": { + "sky_color": 0, + "water_fog_color": 329011, + "fog_color": 10518688, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "enderman", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + } + ], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + }, + { + "name": "end_barrens", + "id": 62, + "element": { + "precipitation": "none", + "temperature": 0.5, + "downfall": 0.5, + "effects": { + "sky_color": 0, + "water_fog_color": 329011, + "fog_color": 10518688, + "water_color": 4159204, + "grass_color_modifier": "none", + "mood_sound": { + "sound": "ambient.cave", + "tick_delay": 6000, + "offset": 2.0, + "block_search_extent": 8 + } + }, + "spawn_settings": { + "probability": 0.1, + "groups": { + "monster": [ + { + "name": "enderman", + "min_group_size": 4, + "max_group_size": 4, + "weight": 10 + } + ], + "creature": [], + "ambient": [], + "axolotls": [], + "underground_water_creature": [], + "water_creature": [], + "water_ambient": [], + "misc": [] + } + } + } + } +] \ No newline at end of file diff --git a/extractor/src/main/java/rs/valence/extractor/Main.java b/extractor/src/main/java/rs/valence/extractor/Main.java index 34fd53b..9d2fd87 100644 --- a/extractor/src/main/java/rs/valence/extractor/Main.java +++ b/extractor/src/main/java/rs/valence/extractor/Main.java @@ -38,6 +38,7 @@ public class Main implements ModInitializer { LOGGER.info("Starting extractors..."); var extractors = new Extractor[]{ + new Biomes(), new Blocks(), new Enchants(), new Entities(), diff --git a/extractor/src/main/java/rs/valence/extractor/extractors/Biomes.java b/extractor/src/main/java/rs/valence/extractor/extractors/Biomes.java new file mode 100644 index 0000000..fc43277 --- /dev/null +++ b/extractor/src/main/java/rs/valence/extractor/extractors/Biomes.java @@ -0,0 +1,128 @@ +package rs.valence.extractor.extractors; + +import com.google.gson.JsonArray; +import com.google.gson.JsonElement; +import com.google.gson.JsonObject; +import net.minecraft.entity.SpawnGroup; +import net.minecraft.util.Identifier; +import net.minecraft.util.collection.Weighted; +import net.minecraft.util.registry.BuiltinRegistries; +import net.minecraft.util.registry.Registry; +import net.minecraft.world.biome.BiomeParticleConfig; +import rs.valence.extractor.Main; + +import java.lang.reflect.Field; + +public class Biomes implements Main.Extractor { + public Biomes() { + } + + @Override + public String fileName() { + return "biomes.json"; + } + + @Override + public JsonElement extract() { + // The biome particle probability field is private. + // We have to resort to reflection, unfortunately. + Field particleConfigProbabilityField; + try { + particleConfigProbabilityField = BiomeParticleConfig.class.getDeclaredField("probability"); + particleConfigProbabilityField.setAccessible(true); + } catch (Exception e) { + throw new RuntimeException(e); + } + + var biomesJson = new JsonArray(); + + for (var biome : BuiltinRegistries.BIOME) { + var biomeIdent = BuiltinRegistries.BIOME.getId(biome); + assert biomeIdent != null; + + var biomeJson = new JsonObject(); + biomeJson.addProperty("precipitation", biome.getPrecipitation().getName()); + biomeJson.addProperty("temperature", biome.getTemperature()); + biomeJson.addProperty("downfall", biome.getDownfall()); + + var effectJson = new JsonObject(); + var biomeEffects = biome.getEffects(); + + effectJson.addProperty("sky_color", biomeEffects.getSkyColor()); + effectJson.addProperty("water_fog_color", biomeEffects.getWaterFogColor()); + effectJson.addProperty("fog_color", biomeEffects.getFogColor()); + effectJson.addProperty("water_color", biomeEffects.getWaterColor()); + biomeEffects.getFoliageColor().ifPresent(color -> effectJson.addProperty("foliage_color", color)); + biomeEffects.getGrassColor().ifPresent(color -> effectJson.addProperty("grass_color", color)); + effectJson.addProperty("grass_color_modifier", biomeEffects.getGrassColorModifier().getName()); + biomeEffects.getMusic().ifPresent(biome_music -> { + var music = new JsonObject(); + music.addProperty("replace_current_music", biome_music.shouldReplaceCurrentMusic()); + music.addProperty("sound", biome_music.getSound().getId().getPath()); + music.addProperty("max_delay", biome_music.getMaxDelay()); + music.addProperty("min_delay", biome_music.getMinDelay()); + effectJson.add("music", music); + }); + + biomeEffects.getLoopSound().ifPresent(soundEvent -> effectJson.addProperty("ambient_sound", soundEvent.getId().getPath())); + biomeEffects.getAdditionsSound().ifPresent(soundEvent -> { + var sound = new JsonObject(); + sound.addProperty("sound", soundEvent.getSound().getId().getPath()); + sound.addProperty("tick_chance", soundEvent.getChance()); + effectJson.add("additions_sound", sound); + }); + biomeEffects.getMoodSound().ifPresent(soundEvent -> { + var sound = new JsonObject(); + sound.addProperty("sound", soundEvent.getSound().getId().getPath()); + sound.addProperty("tick_delay", soundEvent.getCultivationTicks()); + sound.addProperty("offset", soundEvent.getExtraDistance()); + sound.addProperty("block_search_extent", soundEvent.getSpawnRange()); + + effectJson.add("mood_sound", sound); + }); + + biome.getParticleConfig().ifPresent(biomeParticleConfig -> { + try { + var particleConfig = new JsonObject(); + // We must first convert it into an identifier, because asString() returns a resource identifier as string. + Identifier id = new Identifier(biomeParticleConfig.getParticle().asString()); + particleConfig.addProperty("kind", id.getPath()); + particleConfig.addProperty("probability" ,particleConfigProbabilityField.getFloat(biomeParticleConfig)); + biomeJson.add("particle", particleConfig); + } catch (IllegalAccessException e) { + throw new RuntimeException(e); + } + }); + + var spawnSettingsJson = new JsonObject(); + var spawnSettings = biome.getSpawnSettings(); + spawnSettingsJson.addProperty("probability", spawnSettings.getCreatureSpawnProbability()); + + var spawnGroupsJson = new JsonObject(); + for (var spawnGroup : SpawnGroup.values()) { + var spawnGroupJson = new JsonArray(); + for (var entry : spawnSettings.getSpawnEntries(spawnGroup).getEntries()) { + var groupEntryJson = new JsonObject(); + groupEntryJson.addProperty("name", Registry.ENTITY_TYPE.getId(entry.type).getPath()); + groupEntryJson.addProperty("min_group_size", entry.minGroupSize); + groupEntryJson.addProperty("max_group_size", entry.maxGroupSize); + groupEntryJson.addProperty("weight", ((Weighted) entry).getWeight().getValue()); + spawnGroupJson.add(groupEntryJson); + } + spawnGroupsJson.add(spawnGroup.getName(), spawnGroupJson); + } + spawnSettingsJson.add("groups", spawnGroupsJson); + + biomeJson.add("effects", effectJson); + biomeJson.add("spawn_settings", spawnSettingsJson); + + var entryJson = new JsonObject(); + entryJson.addProperty("name", biomeIdent.getPath()); + entryJson.addProperty("id", BuiltinRegistries.BIOME.getRawId(biome)); + entryJson.add("element", biomeJson); + biomesJson.add(entryJson); + } + + return biomesJson; + } +} diff --git a/src/chunk.rs b/src/chunk.rs index 3196646..81712be 100644 --- a/src/chunk.rs +++ b/src/chunk.rs @@ -110,7 +110,8 @@ impl Chunks { } /// Returns the height of all loaded chunks in the world. This returns the - /// same value as [`Chunk::height`] for all loaded chunks. + /// same value as [`Chunk::section_count`] multiplied by 16 for all loaded + /// chunks. pub fn height(&self) -> usize { self.dimension_height as usize } @@ -204,7 +205,7 @@ impl Chunks { let y = pos.y.checked_sub(self.dimension_min_y)?.try_into().ok()?; - if y < chunk.height() { + if y < chunk.section_count() * 16 { Some(chunk.block_state( pos.x.rem_euclid(16) as usize, y, @@ -437,42 +438,46 @@ impl> IndexMut

for Chunks { /// Operations that can be performed on a chunk. [`LoadedChunk`] and /// [`UnloadedChunk`] implement this trait. pub trait Chunk { - /// Returns the height of this chunk in blocks. The result is always a - /// multiple of 16. - fn height(&self) -> usize; + /// Returns the number of sections in this chunk. To get the height of the + /// chunk in meters, multiply the result by 16. + fn section_count(&self) -> usize; /// Gets the block state at the provided offsets in the chunk. /// /// **Note**: The arguments to this function are offsets from the minimum - /// corner of the chunk in _chunk space_ rather than _world space_. You - /// might be looking for [`Chunks::block_state`] instead. + /// corner of the chunk in _chunk space_ rather than _world space_. /// /// # Panics /// - /// Panics if the offsets are outside the bounds of the chunk. + /// Panics if the offsets are outside the bounds of the chunk. `x` and `z` + /// must be less than 16 while `y` must be less than `section_count() * 16`. fn block_state(&self, x: usize, y: usize, z: usize) -> BlockState; /// Sets the block state at the provided offsets in the chunk. The previous /// block state at the position is returned. /// /// **Note**: The arguments to this function are offsets from the minimum - /// corner of the chunk in _chunk space_ rather than _world space_. You - /// might be looking for [`Chunks::set_block_state`] instead. + /// corner of the chunk in _chunk space_ rather than _world space_. /// /// # Panics /// - /// Panics if the offsets are outside the bounds of the chunk. + /// Panics if the offsets are outside the bounds of the chunk. `x` and `z` + /// must be less than 16 while `y` must be less than `section_count() * 16`. fn set_block_state(&mut self, x: usize, y: usize, z: usize, block: BlockState) -> BlockState; - /// Sets every block state in this chunk to the given block state. + /// Sets every block in a section to the given block state. /// - /// This is semantically equivalent to calling [`set_block_state`] on every - /// block in the chunk followed by a call to [`optimize`] at the end. - /// However, this function may be implemented more efficiently. + /// This is semantically equivalent to setting every block in the section + /// with [`set_block_state`]. However, this function may be implemented more + /// efficiently. + /// + /// # Panics + /// + /// Panics if `sect_y` is out of bounds. `sect_y` must be less than the + /// section count. /// /// [`set_block_state`]: Self::set_block_state - /// [`optimize`]: Self::optimize - fn fill_block_states(&mut self, block: BlockState); + fn fill_block_states(&mut self, sect_y: usize, block: BlockState); /// Gets the biome at the provided biome offsets in the chunk. /// @@ -481,7 +486,8 @@ pub trait Chunk { /// /// # Panics /// - /// Panics if the offsets are outside the bounds of the chunk. + /// Panics if the offsets are outside the bounds of the chunk. `x` and `z` + /// must be less than 4 while `y` must be less than `section_count() * 4`. fn biome(&self, x: usize, y: usize, z: usize) -> BiomeId; /// Sets the biome at the provided offsets in the chunk. The previous @@ -492,18 +498,23 @@ pub trait Chunk { /// /// # Panics /// - /// Panics if the offsets are outside the bounds of the chunk. + /// Panics if the offsets are outside the bounds of the chunk. `x` and `z` + /// must be less than 4 while `y` must be less than `section_count() * 4`. fn set_biome(&mut self, x: usize, y: usize, z: usize, biome: BiomeId) -> BiomeId; - /// Sets every biome in this chunk to the given biome. + /// Sets every biome in a section to the given block state. /// - /// This is semantically equivalent to calling [`set_biome`] on every - /// biome in the chunk followed by a call to [`optimize`] at the end. - /// However, this function may be implemented more efficiently. + /// This is semantically equivalent to setting every biome in the section + /// with [`set_biome`]. However, this function may be implemented more + /// efficiently. + /// + /// # Panics + /// + /// Panics if `sect_y` is out of bounds. `sect_y` must be less than the + /// section count. /// /// [`set_biome`]: Self::set_biome - /// [`optimize`]: Self::optimize - fn fill_biomes(&mut self, biome: BiomeId); + fn fill_biomes(&mut self, sect_y: usize, biome: BiomeId); /// Optimizes this chunk to use the minimum amount of memory possible. It /// should have no observable effect on the contents of the chunk. @@ -521,44 +532,30 @@ pub struct UnloadedChunk { impl UnloadedChunk { /// Constructs a new unloaded chunk containing only [`BlockState::AIR`] and - /// [`BiomeId::default()`] with the given height in blocks. - /// - /// # Panics - /// - /// Panics if the value of `height` does not meet the following criteria: - /// `height % 16 == 0 && height <= 4064`. - pub fn new(height: usize) -> Self { + /// [`BiomeId::default()`] with the given number of sections. A section is a + /// 16x16x16 meter volume. + pub fn new(section_count: usize) -> Self { let mut chunk = Self { sections: vec![] }; - - chunk.resize(height); + chunk.resize(section_count); chunk } - /// Changes the height of the chunk to `new_height`. This is a potentially - /// expensive operation that may involve copying. + /// Changes the section count of the chunk to `new_section_count`. This is a + /// potentially expensive operation that may involve copying. /// /// The chunk is extended and truncated from the top. New blocks are always /// [`BlockState::AIR`] and biomes are [`BiomeId::default()`]. - /// - /// # Panics - /// - /// The constraints on `new_height` are the same as [`UnloadedChunk::new`]. - pub fn resize(&mut self, new_height: usize) { - assert!( - new_height % 16 == 0 && new_height <= 4064, - "invalid chunk height of {new_height}" - ); + pub fn resize(&mut self, new_section_count: usize) { + let old_section_count = self.section_count(); - let old_height = self.sections.len() * 16; - - if new_height > old_height { - let additional = (new_height - old_height) / 16; - self.sections.reserve_exact(additional); + if new_section_count > old_section_count { self.sections - .resize_with(new_height / 16, ChunkSection::default); + .reserve_exact(new_section_count - old_section_count); + self.sections + .resize_with(new_section_count, ChunkSection::default); debug_assert_eq!(self.sections.capacity(), self.sections.len()); - } else if new_height < old_height { - self.sections.truncate(new_height / 16); + } else { + self.sections.truncate(new_section_count); } } } @@ -571,13 +568,13 @@ impl Default for UnloadedChunk { } impl Chunk for UnloadedChunk { - fn height(&self) -> usize { - self.sections.len() * 16 + fn section_count(&self) -> usize { + self.sections.len() } fn block_state(&self, x: usize, y: usize, z: usize) -> BlockState { assert!( - x < 16 && y < self.height() && z < 16, + x < 16 && y < self.section_count() * 16 && z < 16, "chunk block offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -588,7 +585,7 @@ impl Chunk for UnloadedChunk { fn set_block_state(&mut self, x: usize, y: usize, z: usize, block: BlockState) -> BlockState { assert!( - x < 16 && y < self.height() && z < 16, + x < 16 && y < self.section_count() * 16 && z < 16, "chunk block offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -605,23 +602,26 @@ impl Chunk for UnloadedChunk { old_block } - fn fill_block_states(&mut self, block: BlockState) { - for sect in self.sections.iter_mut() { - // TODO: adjust motion blocking here. + fn fill_block_states(&mut self, sect_y: usize, block: BlockState) { + let Some(sect) = self.sections.get_mut(sect_y) else { + panic!( + "section index {sect_y} out of bounds for chunk with {} sections", + self.section_count() + ) + }; - if block.is_air() { - sect.non_air_count = 0; - } else { - sect.non_air_count = SECTION_BLOCK_COUNT as u16; - } - - sect.block_states.fill(block); + if block.is_air() { + sect.non_air_count = 0; + } else { + sect.non_air_count = SECTION_BLOCK_COUNT as u16; } + + sect.block_states.fill(block); } fn biome(&self, x: usize, y: usize, z: usize) -> BiomeId { assert!( - x < 4 && y < self.height() / 4 && z < 4, + x < 4 && y < self.section_count() * 4 && z < 4, "chunk biome offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -630,7 +630,7 @@ impl Chunk for UnloadedChunk { fn set_biome(&mut self, x: usize, y: usize, z: usize, biome: BiomeId) -> BiomeId { assert!( - x < 4 && y < self.height() / 4 && z < 4, + x < 4 && y < self.section_count() * 4 && z < 4, "chunk biome offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -639,10 +639,15 @@ impl Chunk for UnloadedChunk { .set(x + z * 4 + y % 4 * 4 * 4, biome) } - fn fill_biomes(&mut self, biome: BiomeId) { - for sect in self.sections.iter_mut() { - sect.biomes.fill(biome); - } + fn fill_biomes(&mut self, sect_y: usize, biome: BiomeId) { + let Some(sect) = self.sections.get_mut(sect_y) else { + panic!( + "section index {sect_y} out of bounds for chunk with {} sections", + self.section_count() + ) + }; + + sect.biomes.fill(biome); } fn optimize(&mut self) { @@ -727,7 +732,7 @@ impl ChunkSection { impl LoadedChunk { fn new(mut chunk: UnloadedChunk, dimension_section_count: usize, state: C::ChunkState) -> Self { - chunk.resize(dimension_section_count * 16); + chunk.resize(dimension_section_count); Self { state, @@ -870,13 +875,13 @@ impl LoadedChunk { } impl Chunk for LoadedChunk { - fn height(&self) -> usize { - self.sections.len() * 16 + fn section_count(&self) -> usize { + self.sections.len() } fn block_state(&self, x: usize, y: usize, z: usize) -> BlockState { assert!( - x < 16 && y < self.height() && z < 16, + x < 16 && y < self.section_count() * 16 && z < 16, "chunk block offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -887,7 +892,7 @@ impl Chunk for LoadedChunk { fn set_block_state(&mut self, x: usize, y: usize, z: usize, block: BlockState) -> BlockState { assert!( - x < 16 && y < self.height() && z < 16, + x < 16 && y < self.section_count() * 16 && z < 16, "chunk block offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -909,37 +914,40 @@ impl Chunk for LoadedChunk { old_block } - fn fill_block_states(&mut self, block: BlockState) { - for sect in self.sections.iter_mut() { - // Mark the appropriate blocks as modified. - // No need to iterate through all the blocks if we know they're all the same. - if let PalettedContainer::Single(single) = §.block_states { - if block != *single { - sect.mark_all_blocks_as_modified(); - } - } else { - for i in 0..SECTION_BLOCK_COUNT { - if block != sect.block_states.get(i) { - sect.mark_block_as_modified(i); - } + fn fill_block_states(&mut self, sect_y: usize, block: BlockState) { + let Some(sect) = self.sections.get_mut(sect_y) else { + panic!( + "section index {sect_y} out of bounds for chunk with {} sections", + self.section_count() + ) + }; + + // Mark the appropriate blocks as modified. + // No need to iterate through all the blocks if we know they're all the same. + if let PalettedContainer::Single(single) = §.block_states { + if block != *single { + sect.mark_all_blocks_as_modified(); + } + } else { + for i in 0..SECTION_BLOCK_COUNT { + if block != sect.block_states.get(i) { + sect.mark_block_as_modified(i); } } - - // TODO: adjust motion blocking here. - - if block.is_air() { - sect.non_air_count = 0; - } else { - sect.non_air_count = SECTION_BLOCK_COUNT as u16; - } - - sect.block_states.fill(block); } + + if block.is_air() { + sect.non_air_count = 0; + } else { + sect.non_air_count = SECTION_BLOCK_COUNT as u16; + } + + sect.block_states.fill(block); } fn biome(&self, x: usize, y: usize, z: usize) -> BiomeId { assert!( - x < 4 && y < self.height() / 4 && z < 4, + x < 4 && y < self.section_count() * 4 && z < 4, "chunk biome offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -948,7 +956,7 @@ impl Chunk for LoadedChunk { fn set_biome(&mut self, x: usize, y: usize, z: usize, biome: BiomeId) -> BiomeId { assert!( - x < 4 && y < self.height() / 4 && z < 4, + x < 4 && y < self.section_count() * 4 && z < 4, "chunk biome offsets of ({x}, {y}, {z}) are out of bounds" ); @@ -963,10 +971,15 @@ impl Chunk for LoadedChunk { old_biome } - fn fill_biomes(&mut self, biome: BiomeId) { - for sect in self.sections.iter_mut() { - sect.biomes.fill(biome); - } + fn fill_biomes(&mut self, sect_y: usize, biome: BiomeId) { + let Some(sect) = self.sections.get_mut(sect_y) else { + panic!( + "section index {sect_y} out of bounds for chunk with {} sections", + self.section_count() + ) + }; + + sect.biomes.fill(biome); // TODO: this is set to true unconditionally, but it doesn't have to be. self.any_biomes_modified = true; @@ -983,13 +996,6 @@ impl Chunk for LoadedChunk { } } -/* -fn is_motion_blocking(b: BlockState) -> bool { - // TODO: use is_solid || is_fluid ? - !b.is_air() -} -*/ - fn compact_u64s_len(vals_count: usize, bits_per_val: usize) -> usize { let vals_per_u64 = 64 / bits_per_val; num::Integer::div_ceil(&vals_count, &vals_per_u64) @@ -1080,8 +1086,14 @@ mod tests { check_invariants(&loaded.sections); check_invariants(&unloaded.sections); - loaded.fill_block_states(rand_block_state(&mut rng)); - unloaded.fill_block_states(rand_block_state(&mut rng)); + loaded.fill_block_states( + rng.gen_range(0..loaded.section_count()), + rand_block_state(&mut rng), + ); + unloaded.fill_block_states( + rng.gen_range(0..loaded.section_count()), + rand_block_state(&mut rng), + ); check_invariants(&loaded.sections); check_invariants(&unloaded.sections); diff --git a/valence_anvil/Cargo.toml b/valence_anvil/Cargo.toml new file mode 100644 index 0000000..a50e855 --- /dev/null +++ b/valence_anvil/Cargo.toml @@ -0,0 +1,38 @@ +[package] +name = "valence_anvil" +description = "A library for Minecraft's Anvil world format." +documentation = "https://docs.rs/valence_anvil/" +repository = "https://github.com/valence_anvil/valence/tree/main/valence_anvil" +readme = "README.md" +license = "MIT" +keywords = ["anvil", "minecraft", "deserialization"] +version = "0.1.0" +authors = ["Ryan Johnson ", "TerminatorNL "] +edition = "2021" + +[dependencies] +byteorder = "1.4.3" +flate2 = "1.0.25" +thiserror = "1.0.37" +num-integer = "0.1.45" # TODO: remove when div_ceil is stabilized. +valence = { version = "0.1.0", path = "..", optional = true } +valence_nbt = { version = "0.5.0", path = "../valence_nbt" } + +[dev-dependencies] +anyhow = "1.0.68" +criterion = "0.4.0" +fs_extra = "1.2.0" +tempfile = "3.3.0" +valence = { version = "0.1.0", path = ".." } +valence_anvil = { version = "0.1.0", path = ".", features = ["valence"] } +zip = "0.6.3" + +[dev-dependencies.reqwest] +version = "0.11.12" +default-features = false +# Avoid OpenSSL dependency on Linux. +features = ["rustls-tls", "blocking", "stream"] + +[[bench]] +name = "world_parsing" +harness = false diff --git a/valence_anvil/benches/world_parsing.rs b/valence_anvil/benches/world_parsing.rs new file mode 100644 index 0000000..b586d05 --- /dev/null +++ b/valence_anvil/benches/world_parsing.rs @@ -0,0 +1,137 @@ +use std::fs::create_dir_all; +use std::path::{Path, PathBuf}; + +use anyhow::{ensure, Context}; +use criterion::{black_box, criterion_group, criterion_main, Criterion}; +use fs_extra::dir::CopyOptions; +use reqwest::IntoUrl; +use valence::chunk::UnloadedChunk; +use valence_anvil::AnvilWorld; +use zip::ZipArchive; + +criterion_group!(benches, criterion_benchmark); +criterion_main!(benches); + +fn criterion_benchmark(c: &mut Criterion) { + let world_dir = get_world_asset( + "https://github.com/valence-rs/valence-test-data/archive/refs/heads/asset/sp_world_1.19.2.zip", + "1.19.2 benchmark world", + true + ).expect("failed to get world asset"); + + let mut world = AnvilWorld::new(world_dir); + + c.bench_function("Load square 10x10", |b| { + b.iter(|| { + let world = black_box(&mut world); + + for z in -5..5 { + for x in -5..5 { + let nbt = world + .read_chunk(x, z) + .expect("failed to read chunk") + .expect("missing chunk at position") + .data; + + let mut chunk = UnloadedChunk::new(24); + + valence_anvil::to_valence(&nbt, &mut chunk, 4, |_| Default::default()).unwrap(); + + black_box(chunk); + } + } + }); + }); +} + +/// Loads the asset. If the asset is already present on the system due to a +/// prior run, the cached asset is used instead. If the asset is not +/// cached yet, this function downloads the asset using the current thread. +/// This will block until the download is complete. +/// +/// returns: `PathBuf` The reference to the asset on the file system +fn get_world_asset( + url: impl IntoUrl, + dest_path: impl AsRef, + remove_top_level_dir: bool, +) -> anyhow::Result { + let url = url.into_url()?; + let dest_path = dest_path.as_ref(); + + let asset_cache_dir = Path::new(".asset_cache"); + + create_dir_all(asset_cache_dir).context("unable to create `.asset_cache` directory")?; + + let final_path = asset_cache_dir.join(dest_path); + + if final_path.exists() { + return Ok(final_path); + } + + let mut response = reqwest::blocking::get(url.clone())?; + + let cache_download_directory = asset_cache_dir.join("downloads"); + + create_dir_all(&cache_download_directory) + .context("unable to create `.asset_cache/downloads` directory")?; + + let mut downloaded_zip_file = + tempfile::tempfile_in(&cache_download_directory).context("Could not create temp file")?; + + println!("Downloading {dest_path:?} from {url}"); + + response + .copy_to(&mut downloaded_zip_file) + .context("could not write web contents to the temporary file")?; + + let mut zip_archive = ZipArchive::new(downloaded_zip_file) + .context("unable to create zip archive from downloaded content")?; + + if !remove_top_level_dir { + zip_archive + .extract(&final_path) + .context("unable to unzip downloaded contents")?; + + return Ok(final_path); + } + + let temp_dir = tempfile::tempdir_in(&cache_download_directory) + .context("unable to create temporary directory in `.asset_cache`")?; + + zip_archive + .extract(&temp_dir) + .context("unable to unzip downloaded contents")?; + + let mut entries = temp_dir.path().read_dir()?; + + let top_level_dir = entries + .next() + .context("the downloaded zip file was empty")??; + + ensure!( + entries.next().is_none(), + "found more than one entry in the top level directory of the Zip file" + ); + + ensure!( + top_level_dir.path().is_dir(), + "the only content in the zip archive is a file" + ); + + create_dir_all(&final_path).context("could not create a directory inside the asset cache")?; + + let dir_entries = top_level_dir + .path() + .read_dir()? + .collect::, _>>()?; + + let items_to_move: Vec<_> = dir_entries.into_iter().map(|d| d.path()).collect(); + + fs_extra::move_items(&items_to_move, &final_path, &CopyOptions::new())?; + + // We keep the temporary directory around until we're done moving files out + // of it. + drop(temp_dir); + + Ok(final_path) +} diff --git a/valence_anvil/examples/valence_loading.rs b/valence_anvil/examples/valence_loading.rs new file mode 100644 index 0000000..d0edeec --- /dev/null +++ b/valence_anvil/examples/valence_loading.rs @@ -0,0 +1,201 @@ +//! # IMPORTANT +//! +//! Run this example with one argument containing the path of the the following +//! to the world directory you wish to load. Inside this directory you can +//! commonly see `advancements`, `DIM1`, `DIM-1` and most importantly `region` +//! subdirectories. Only the `region` directory is accessed. + +extern crate valence; + +use std::env; +use std::net::SocketAddr; +use std::path::PathBuf; +use std::sync::atomic::{AtomicUsize, Ordering}; + +use valence::prelude::*; +use valence_anvil::AnvilWorld; + +pub fn main() -> ShutdownResult { + let Some(world_dir) = env::args().nth(1) else { + return Err("please add the world directory as program argument.".into()) + }; + + let world_dir = PathBuf::from(world_dir); + + if !world_dir.exists() || !world_dir.is_dir() { + return Err("world argument must be a directory that exists".into()); + } + + if !world_dir.join("region").exists() { + return Err("could not find the \"region\" directory in the given world directory".into()); + } + + valence::start_server( + Game { + world_dir, + player_count: AtomicUsize::new(0), + }, + None, + ) +} + +#[derive(Debug, Default)] +struct ClientData { + id: EntityId, + //block: valence::block::BlockKind +} + +struct Game { + world_dir: PathBuf, + player_count: AtomicUsize, +} + +const MAX_PLAYERS: usize = 10; + +#[async_trait] +impl Config for Game { + type ServerState = Option; + type ClientState = ClientData; + type EntityState = (); + type WorldState = AnvilWorld; + /// If the chunk should stay loaded at the end of the tick. + type ChunkState = bool; + type PlayerListState = (); + type InventoryState = (); + + async fn server_list_ping( + &self, + _server: &SharedServer, + _remote_addr: SocketAddr, + _protocol_version: i32, + ) -> ServerListPing { + ServerListPing::Respond { + online_players: self.player_count.load(Ordering::SeqCst) as i32, + max_players: MAX_PLAYERS as i32, + player_sample: Default::default(), + description: "Hello Valence!".color(Color::AQUA), + favicon_png: Some( + include_bytes!("../../assets/logo-64x64.png") + .as_slice() + .into(), + ), + } + } + + fn init(&self, server: &mut Server) { + for (id, _) in server.shared.dimensions() { + server.worlds.insert(id, AnvilWorld::new(&self.world_dir)); + } + server.state = Some(server.player_lists.insert(()).0); + } + + fn update(&self, server: &mut Server) { + let (world_id, world) = server.worlds.iter_mut().next().unwrap(); + + server.clients.retain(|_, client| { + if client.created_this_tick() { + if self + .player_count + .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |count| { + (count < MAX_PLAYERS).then_some(count + 1) + }) + .is_err() + { + client.disconnect("The server is full!".color(Color::RED)); + return false; + } + + match server + .entities + .insert_with_uuid(EntityKind::Player, client.uuid(), ()) + { + Some((id, _)) => client.state.id = id, + None => { + client.disconnect("Conflicting UUID"); + return false; + } + } + + client.respawn(world_id); + client.set_flat(true); + client.set_game_mode(GameMode::Spectator); + client.teleport([0.0, 125.0, 0.0], 0.0, 0.0); + client.set_player_list(server.state.clone()); + + if let Some(id) = &server.state { + server.player_lists.get_mut(id).insert( + client.uuid(), + client.username(), + client.textures().cloned(), + client.game_mode(), + 0, + None, + ); + } + + client.send_message("Welcome to the java chunk parsing example!"); + client.send_message( + "Chunks with a single lava source block indicates that the chunk is not \ + (fully) generated." + .italic(), + ); + } + + if client.is_disconnected() { + self.player_count.fetch_sub(1, Ordering::SeqCst); + if let Some(id) = &server.state { + server.player_lists.get_mut(id).remove(client.uuid()); + } + server.entities.delete(client.id); + + return false; + } + + if let Some(entity) = server.entities.get_mut(client.state.id) { + while let Some(event) = client.next_event() { + event.handle_default(client, entity); + } + } + + let dist = client.view_distance(); + let p = client.position(); + + for pos in ChunkPos::at(p.x, p.z).in_view(dist) { + if let Some(existing) = world.chunks.get_mut(pos) { + existing.state = true; + } else { + match world.state.read_chunk(pos.x, pos.z) { + Ok(Some(anvil_chunk)) => { + let mut chunk = UnloadedChunk::new(24); + + if let Err(e) = + valence_anvil::to_valence(&anvil_chunk.data, &mut chunk, 4, |_| { + BiomeId::default() + }) + { + eprintln!("Failed to convert chunk at ({}, {}): {e}", pos.x, pos.z); + } + + world.chunks.insert(pos, chunk, true); + } + Ok(None) => { + // No chunk at this position. + world.chunks.insert(pos, UnloadedChunk::default(), true); + } + Err(e) => { + eprintln!("Failed to read chunk at ({}, {}): {e}", pos.x, pos.z) + } + } + } + } + + true + }); + + for (_, chunk) in world.chunks.iter_mut() { + if !chunk.state { + chunk.set_deleted(true) + } + } + } +} diff --git a/valence_anvil/src/lib.rs b/valence_anvil/src/lib.rs new file mode 100644 index 0000000..96a2b8d --- /dev/null +++ b/valence_anvil/src/lib.rs @@ -0,0 +1,171 @@ +use std::collections::btree_map::Entry; +use std::collections::BTreeMap; +use std::fs::File; +use std::io; +use std::io::{ErrorKind, Read, Seek, SeekFrom}; +use std::path::PathBuf; + +use byteorder::{BigEndian, ReadBytesExt}; +use flate2::bufread::{GzDecoder, ZlibDecoder}; +use thiserror::Error; +#[cfg(feature = "valence")] +pub use to_valence::*; +use valence_nbt::Compound; + +#[cfg(feature = "valence")] +mod to_valence; + +#[derive(Debug)] +pub struct AnvilWorld { + /// Path to the "region" subdirectory in the world root. + region_root: PathBuf, + /// Maps region (x, z) positions to region files. + regions: BTreeMap<(i32, i32), Region>, +} + +#[derive(Clone, PartialEq, Debug)] +pub struct AnvilChunk { + /// This chunk's NBT data. + pub data: Compound, + /// The time this chunk was last modified measured in seconds since the + /// epoch. + pub timestamp: u32, +} + +#[derive(Debug, Error)] +#[non_exhaustive] +pub enum ReadChunkError { + #[error(transparent)] + Io(#[from] io::Error), + #[error(transparent)] + Nbt(#[from] valence_nbt::Error), + #[error("invalid chunk sector offset")] + BadSectorOffset, + #[error("invalid chunk size")] + BadChunkSize, + #[error("unknown compression scheme number of {0}")] + UnknownCompressionScheme(u8), + #[error("not all chunk NBT data was read")] + IncompleteNbtRead, +} + +#[derive(Debug)] +struct Region { + file: File, + /// The first 8 KiB in the file. + header: [u8; SECTOR_SIZE * 2], +} + +const SECTOR_SIZE: usize = 4096; + +impl AnvilWorld { + pub fn new(world_root: impl Into) -> Self { + let mut region_root = world_root.into(); + region_root.push("region"); + + Self { + region_root, + regions: BTreeMap::new(), + } + } + + /// Reads a chunk from the file system with the given chunk coordinates. If + /// no chunk exists at the position, then `None` is returned. + pub fn read_chunk( + &mut self, + chunk_x: i32, + chunk_z: i32, + ) -> Result, ReadChunkError> { + let region_x = chunk_x.div_euclid(32); + let region_z = chunk_z.div_euclid(32); + + let region = match self.regions.entry((region_x, region_z)) { + Entry::Vacant(ve) => { + // Load the region file if it exists. Otherwise, the chunk is considered absent. + + let path = self + .region_root + .join(format!("r.{region_x}.{region_z}.mca")); + + let mut file = match File::options().read(true).write(true).open(path) { + Ok(file) => file, + Err(e) if e.kind() == ErrorKind::NotFound => return Ok(None), + Err(e) => return Err(e.into()), + }; + + let mut header = [0; SECTOR_SIZE * 2]; + + file.read_exact(&mut header)?; + + ve.insert(Region { file, header }) + } + Entry::Occupied(oe) => oe.into_mut(), + }; + + let chunk_idx = (chunk_x.rem_euclid(32) + chunk_z.rem_euclid(32) * 32) as usize; + + let location_bytes = (®ion.header[chunk_idx * 4..]).read_u32::()?; + let timestamp = (®ion.header[chunk_idx * 4 + SECTOR_SIZE..]).read_u32::()?; + + if location_bytes == 0 { + // No chunk exists at this position. + return Ok(None); + } + + let sector_offset = (location_bytes >> 8) as u64; + let sector_count = (location_bytes & 0xff) as usize; + + if sector_offset < 2 { + // If the sector offset was <2, then the chunk data would be inside the region + // header. That doesn't make any sense. + return Err(ReadChunkError::BadSectorOffset); + } + + // Seek to the beginning of the chunk's data. + region + .file + .seek(SeekFrom::Start(sector_offset * SECTOR_SIZE as u64))?; + + let exact_chunk_size = region.file.read_u32::()? as usize; + + if exact_chunk_size > sector_count * SECTOR_SIZE { + // Sector size of this chunk must always be >= the exact size. + return Err(ReadChunkError::BadChunkSize); + } + + let mut data_buf = vec![0; exact_chunk_size].into_boxed_slice(); + region.file.read_exact(&mut data_buf)?; + + let mut r = data_buf.as_ref(); + + let mut decompress_buf = vec![]; + + // What compression does the chunk use? + let mut nbt_slice = match r.read_u8()? { + // GZip + 1 => { + let mut z = GzDecoder::new(r); + z.read_to_end(&mut decompress_buf)?; + decompress_buf.as_slice() + } + // Zlib + 2 => { + let mut z = ZlibDecoder::new(r); + z.read_to_end(&mut decompress_buf)?; + decompress_buf.as_slice() + } + // Uncompressed + 3 => r, + // Unknown + b => return Err(ReadChunkError::UnknownCompressionScheme(b)), + }; + + let (data, _) = valence_nbt::from_binary_slice(&mut nbt_slice)?; + + if !nbt_slice.is_empty() { + return Err(ReadChunkError::IncompleteNbtRead); + } + + Ok(Some(AnvilChunk { data, timestamp })) + } +} diff --git a/valence_anvil/src/to_valence.rs b/valence_anvil/src/to_valence.rs new file mode 100644 index 0000000..0537cb2 --- /dev/null +++ b/valence_anvil/src/to_valence.rs @@ -0,0 +1,275 @@ +use num_integer::div_ceil; +use thiserror::Error; +use valence::biome::BiomeId; +use valence::chunk::Chunk; +use valence::protocol::block::{BlockKind, PropName, PropValue}; +use valence::protocol::Ident; +use valence_nbt::{Compound, List, Value}; + +#[derive(Clone, Debug, Error)] +#[non_exhaustive] +pub enum ToValenceError { + #[error("missing chunk sections")] + MissingSections, + #[error("missing chunk section Y")] + MissingSectionY, + #[error("missing block states")] + MissingBlockStates, + #[error("missing block palette")] + MissingBlockPalette, + #[error("invalid block palette length")] + BadBlockPaletteLen, + #[error("missing block name in palette")] + MissingBlockName, + #[error("unknown block name of \"{0}\"")] + UnknownBlockName(String), + #[error("unknown property name of \"{0}\"")] + UnknownPropName(String), + #[error("property value of block is not a string")] + BadPropValueType, + #[error("unknown property value of \"{0}\"")] + UnknownPropValue(String), + #[error("missing packed block state data in section")] + MissingBlockStateData, + #[error("unexpected number of longs in block state data")] + BadBlockLongCount, + #[error("invalid block palette index")] + BadBlockPaletteIndex, + #[error("missing biomes")] + MissingBiomes, + #[error("missing biome palette")] + MissingBiomePalette, + #[error("invalid biome palette length")] + BadBiomePaletteLen, + #[error("biome name is not a valid resource identifier")] + BadBiomeName, + #[error("missing biome name")] + MissingBiomeName, + #[error("missing packed biome data in section")] + MissingBiomeData, + #[error("unexpected number of longs in biome data")] + BadBiomeLongCount, + #[error("invalid biome palette index")] + BadBiomePaletteIndex, +} + +/// Reads an Anvil chunk in NBT form and writes its data to a Valence [`Chunk`]. +/// An error is returned if the NBT data does not match the expected structure +/// for an Anvil chunk. +/// +/// # Arguments +/// +/// - `nbt`: The Anvil chunk to read from. This is usually the value returned by +/// [`read_chunk`]. +/// - `chunk`: The Valence chunk to write to. +/// - `sect_offset`: A constant to add to all sector Y positions in `nbt`. After +/// applying the offset, only the sectors in the range +/// `0..chunk.sector_count()` are written. +/// - `map_biome`: A function to map biome resource identifiers in the NBT data +/// to Valence [`BiomeId`]s. +/// +/// [`read_chunk`]: crate::AnvilWorld::read_chunk +pub fn to_valence( + nbt: &Compound, + chunk: &mut C, + sect_offset: i32, + mut map_biome: F, +) -> Result<(), ToValenceError> +where + C: Chunk, + F: FnMut(Ident<&str>) -> BiomeId, +{ + let Some(Value::List(List::Compound(sections))) = nbt.get("sections") else { + return Err(ToValenceError::MissingSections) + }; + + let mut converted_block_palette = vec![]; + let mut converted_biome_palette = vec![]; + + for section in sections { + let Some(Value::Byte(sect_y)) = section.get("Y") else { + return Err(ToValenceError::MissingSectionY) + }; + + let adjusted_sect_y = *sect_y as i32 + sect_offset; + + if adjusted_sect_y < 0 || adjusted_sect_y as usize >= chunk.section_count() { + // Section is out of bounds. Skip it. + continue; + } + + let Some(Value::Compound(block_states)) = section.get("block_states") else { + return Err(ToValenceError::MissingBlockStates) + }; + + let Some(Value::List(List::Compound(palette))) = block_states.get("palette") else { + return Err(ToValenceError::MissingBlockPalette) + }; + + if !(1..BLOCKS_PER_SECTION).contains(&palette.len()) { + return Err(ToValenceError::BadBlockPaletteLen); + } + + converted_block_palette.clear(); + + for block in palette { + let Some(Value::String(name)) = block.get("Name") else { + return Err(ToValenceError::MissingBlockName) + }; + + let Some(block_kind) = BlockKind::from_str(ident_path(name)) else { + return Err(ToValenceError::UnknownBlockName(name.into())) + }; + + let mut state = block_kind.to_state(); + + if let Some(Value::Compound(properties)) = block.get("Properties") { + for (key, value) in properties { + let Value::String(value) = value else { + return Err(ToValenceError::BadPropValueType) + }; + + let Some(prop_name) = PropName::from_str(key) else { + return Err(ToValenceError::UnknownPropName(key.into())) + }; + + let Some(prop_value) = PropValue::from_str(value) else { + return Err(ToValenceError::UnknownPropValue(value.into())) + }; + + state = state.set(prop_name, prop_value); + } + } + + converted_block_palette.push(state); + } + + if converted_block_palette.len() == 1 { + chunk.fill_block_states(adjusted_sect_y as usize, converted_block_palette[0]); + } else { + debug_assert!(converted_block_palette.len() > 1); + + let Some(Value::LongArray(data)) = block_states.get("data") else { + return Err(ToValenceError::MissingBlockStateData) + }; + + let bits_per_idx = bit_width(converted_block_palette.len() - 1).max(4); + let idxs_per_long = 64 / bits_per_idx; + let long_count = div_ceil(BLOCKS_PER_SECTION, idxs_per_long); + let mask = 2_u64.pow(bits_per_idx as u32) - 1; + + if long_count != data.len() { + return Err(ToValenceError::BadBlockLongCount); + }; + + let mut i = 0; + for &long in data.iter() { + let u64 = long as u64; + + for j in 0..idxs_per_long { + if i >= BLOCKS_PER_SECTION { + break; + } + + let idx = (u64 >> (bits_per_idx * j)) & mask; + + let Some(block) = converted_block_palette.get(idx as usize).cloned() else { + return Err(ToValenceError::BadBlockPaletteIndex) + }; + + let x = i % 16; + let z = i / 16 % 16; + let y = i / (16 * 16); + + chunk.set_block_state(x, adjusted_sect_y as usize * 16 + y, z, block); + + i += 1; + } + } + } + + let Some(Value::Compound(biomes)) = section.get("biomes") else { + return Err(ToValenceError::MissingBiomes) + }; + + let Some(Value::List(List::String(palette))) = biomes.get("palette") else { + return Err(ToValenceError::MissingBiomePalette) + }; + + if !(1..BIOMES_PER_SECTION).contains(&palette.len()) { + return Err(ToValenceError::BadBiomePaletteLen); + } + + converted_biome_palette.clear(); + + for biome_name in palette { + let Ok(ident) = Ident::new(biome_name.as_str()) else { + return Err(ToValenceError::BadBiomeName) + }; + + converted_biome_palette.push(map_biome(ident)); + } + + if converted_biome_palette.len() == 1 { + chunk.fill_biomes(adjusted_sect_y as usize, converted_biome_palette[0]); + } else { + debug_assert!(converted_biome_palette.len() > 1); + + let Some(Value::LongArray(data)) = biomes.get("data") else { + return Err(ToValenceError::MissingBiomeData) + }; + + let bits_per_idx = bit_width(converted_biome_palette.len() - 1); + let idxs_per_long = 64 / bits_per_idx; + let long_count = div_ceil(BIOMES_PER_SECTION, idxs_per_long); + let mask = 2_u64.pow(bits_per_idx as u32) - 1; + + if long_count != data.len() { + return Err(ToValenceError::BadBiomeLongCount); + }; + + let mut i = 0; + for &long in data.iter() { + let u64 = long as u64; + + for j in 0..idxs_per_long { + if i >= BIOMES_PER_SECTION { + break; + } + + let idx = (u64 >> (bits_per_idx * j)) & mask; + + let Some(biome) = converted_biome_palette.get(idx as usize).cloned() else { + return Err(ToValenceError::BadBiomePaletteIndex) + }; + + let x = i % 4; + let z = i / 4 % 4; + let y = i / (4 * 4); + + chunk.set_biome(x, adjusted_sect_y as usize * 4 + y, z, biome); + + i += 1; + } + } + } + } + + Ok(()) +} + +const BLOCKS_PER_SECTION: usize = 16 * 16 * 16; +const BIOMES_PER_SECTION: usize = 4 * 4 * 4; + +/// Gets the path part of a resource identifier. +fn ident_path(ident: &str) -> &str { + match ident.rsplit_once(':') { + Some((_, after)) => after, + None => ident, + } +} + +/// Returns the minimum number of bits needed to represent the integer `n`. +const fn bit_width(n: usize) -> usize { + (usize::BITS - n.leading_zeros()) as _ +}