mirror of
https://github.com/mat-1/azalea.git
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415 lines
13 KiB
Rust
Executable file
415 lines
13 KiB
Rust
Executable file
use crate::palette::PalettedContainer;
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use crate::palette::PalettedContainerType;
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use azalea_block::BlockState;
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use azalea_buf::{BufReadError, McBufReadable, McBufWritable};
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use azalea_core::{BlockPos, ChunkBlockPos, ChunkPos, ChunkSectionBlockPos};
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use log::{debug, trace, warn};
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use parking_lot::RwLock;
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use std::{
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collections::HashMap,
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fmt::Debug,
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io::{Cursor, Write},
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sync::{Arc, Weak},
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};
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const SECTION_HEIGHT: u32 = 16;
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/// An efficient storage of chunks for a client that has a limited render
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/// distance. This has support for using a shared [`ChunkStorage`].
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pub struct PartialChunkStorage {
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/// The center of the view, i.e. the chunk the player is currently in. You
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/// can safely modify this.
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pub view_center: ChunkPos,
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chunk_radius: u32,
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view_range: u32,
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// chunks is a list of size chunk_radius * chunk_radius
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chunks: Vec<Option<Arc<RwLock<Chunk>>>>,
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}
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/// A storage for chunks where they're only stored weakly, so if they're not
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/// actively being used somewhere else they'll be forgotten. This is used for
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/// shared worlds.
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#[derive(Debug)]
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pub struct ChunkStorage {
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pub height: u32,
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pub min_y: i32,
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pub chunks: HashMap<ChunkPos, Weak<RwLock<Chunk>>>,
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}
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/// A single chunk in a world (16*?*16 blocks). This only contains the blocks
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/// and biomes. You can derive the height of the chunk from the number of
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/// sections, but you need a [`ChunkStorage`] to get the minimum Y
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/// coordinate.
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#[derive(Debug)]
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pub struct Chunk {
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pub sections: Vec<Section>,
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}
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/// A section of a chunk, i.e. a 16*16*16 block area.
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#[derive(Clone, Debug)]
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pub struct Section {
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pub block_count: u16,
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pub states: PalettedContainer,
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pub biomes: PalettedContainer,
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}
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impl Default for Section {
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fn default() -> Self {
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Section {
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block_count: 0,
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states: PalettedContainer::new(&PalettedContainerType::BlockStates).unwrap(),
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biomes: PalettedContainer::new(&PalettedContainerType::Biomes).unwrap(),
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}
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}
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}
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impl Default for Chunk {
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fn default() -> Self {
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Chunk {
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sections: vec![Section::default(); (384 / 16) as usize],
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}
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}
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}
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impl PartialChunkStorage {
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pub fn new(chunk_radius: u32) -> Self {
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let view_range = chunk_radius * 2 + 1;
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PartialChunkStorage {
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view_center: ChunkPos::new(0, 0),
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chunk_radius,
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view_range,
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chunks: vec![None; (view_range * view_range) as usize],
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}
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}
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fn get_index(&self, chunk_pos: &ChunkPos) -> usize {
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(i32::rem_euclid(chunk_pos.x, self.view_range as i32) * (self.view_range as i32)
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+ i32::rem_euclid(chunk_pos.z, self.view_range as i32)) as usize
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}
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pub fn in_range(&self, chunk_pos: &ChunkPos) -> bool {
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(chunk_pos.x - self.view_center.x).unsigned_abs() <= self.chunk_radius
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&& (chunk_pos.z - self.view_center.z).unsigned_abs() <= self.chunk_radius
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}
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pub fn set_block_state(
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&self,
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pos: &BlockPos,
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state: BlockState,
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chunk_storage: &mut ChunkStorage,
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) -> Option<BlockState> {
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if pos.y < chunk_storage.min_y
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|| pos.y >= (chunk_storage.min_y + chunk_storage.height as i32)
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{
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return None;
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}
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let chunk_pos = ChunkPos::from(pos);
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let chunk_lock = chunk_storage.get(&chunk_pos)?;
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let mut chunk = chunk_lock.write();
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Some(chunk.get_and_set(&ChunkBlockPos::from(pos), state, chunk_storage.min_y))
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}
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pub fn replace_with_packet_data(
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&mut self,
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pos: &ChunkPos,
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data: &mut Cursor<&[u8]>,
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chunk_storage: &mut ChunkStorage,
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) -> Result<(), BufReadError> {
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debug!("Replacing chunk at {:?}", pos);
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if !self.in_range(pos) {
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trace!(
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"Ignoring chunk since it's not in the view range: {}, {}",
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pos.x,
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pos.z
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);
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return Ok(());
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}
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let chunk = Arc::new(RwLock::new(Chunk::read_with_dimension_height(
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data,
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chunk_storage.height,
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)?));
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trace!("Loaded chunk {:?}", pos);
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self.set(pos, Some(chunk), chunk_storage);
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Ok(())
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}
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/// Get a [`Chunk`] within render distance, or `None` if it's not loaded.
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/// Use [`ChunkStorage::get`] to get a chunk from the shared storage.
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pub fn limited_get(&self, pos: &ChunkPos) -> Option<&Arc<RwLock<Chunk>>> {
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if !self.in_range(pos) {
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warn!(
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"Chunk at {:?} is not in the render distance (center: {:?}, {} chunks)",
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pos, self.view_center, self.chunk_radius,
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);
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return None;
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}
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let index = self.get_index(pos);
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self.chunks[index].as_ref()
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}
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/// Get a mutable reference to a [`Chunk`] within render distance, or
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/// `None` if it's not loaded. Use [`ChunkStorage::get`] to get
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/// a chunk from the shared storage.
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pub fn limited_get_mut(&mut self, pos: &ChunkPos) -> Option<&mut Option<Arc<RwLock<Chunk>>>> {
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if !self.in_range(pos) {
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return None;
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}
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let index = self.get_index(pos);
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Some(&mut self.chunks[index])
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}
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/// Set a chunk in the shared storage and reference it from the limited
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/// storage.
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///
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/// # Panics
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/// If the chunk is not in the render distance.
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pub fn set(
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&mut self,
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pos: &ChunkPos,
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chunk: Option<Arc<RwLock<Chunk>>>,
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chunk_storage: &mut ChunkStorage,
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) {
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if let Some(chunk) = &chunk {
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chunk_storage.chunks.insert(*pos, Arc::downgrade(chunk));
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} else {
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// don't remove it from the shared storage, since it'll be removed
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// automatically if this was the last reference
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}
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if let Some(chunk_mut) = self.limited_get_mut(pos) {
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*chunk_mut = chunk;
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}
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}
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}
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impl ChunkStorage {
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pub fn new(height: u32, min_y: i32) -> Self {
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ChunkStorage {
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height,
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min_y,
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chunks: HashMap::new(),
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}
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}
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pub fn get(&self, pos: &ChunkPos) -> Option<Arc<RwLock<Chunk>>> {
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self.chunks.get(pos).and_then(|chunk| chunk.upgrade())
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}
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pub fn get_block_state(&self, pos: &BlockPos) -> Option<BlockState> {
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let chunk_pos = ChunkPos::from(pos);
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let chunk = self.get(&chunk_pos)?;
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let chunk = chunk.read();
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chunk.get(&ChunkBlockPos::from(pos), self.min_y)
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}
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pub fn set_block_state(&self, pos: &BlockPos, state: BlockState) -> Option<BlockState> {
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if pos.y < self.min_y || pos.y >= (self.min_y + self.height as i32) {
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return None;
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}
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let chunk_pos = ChunkPos::from(pos);
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let chunk = self.get(&chunk_pos)?;
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let mut chunk = chunk.write();
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Some(chunk.get_and_set(&ChunkBlockPos::from(pos), state, self.min_y))
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}
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}
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impl Chunk {
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pub fn read_with_dimension_height(
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buf: &mut Cursor<&[u8]>,
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dimension_height: u32,
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) -> Result<Self, BufReadError> {
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let section_count = dimension_height / SECTION_HEIGHT;
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let mut sections = Vec::with_capacity(section_count as usize);
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for _ in 0..section_count {
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let section = Section::read_from(buf)?;
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sections.push(section);
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}
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Ok(Chunk { sections })
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}
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pub fn get(&self, pos: &ChunkBlockPos, min_y: i32) -> Option<BlockState> {
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if pos.y < min_y {
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// y position is out of bounds
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return None;
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}
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let section_index = section_index(pos.y, min_y) as usize;
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if section_index >= self.sections.len() {
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// y position is out of bounds
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return None;
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};
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// TODO: make sure the section exists
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let section = &self.sections[section_index];
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let chunk_section_pos = ChunkSectionBlockPos::from(pos);
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Some(section.get(chunk_section_pos))
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}
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pub fn get_and_set(
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&mut self,
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pos: &ChunkBlockPos,
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state: BlockState,
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min_y: i32,
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) -> BlockState {
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let section_index = section_index(pos.y, min_y);
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// TODO: make sure the section exists
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let section = &mut self.sections[section_index as usize];
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let chunk_section_pos = ChunkSectionBlockPos::from(pos);
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section.get_and_set(chunk_section_pos, state)
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}
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pub fn set(&mut self, pos: &ChunkBlockPos, state: BlockState, min_y: i32) {
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let section_index = section_index(pos.y, min_y);
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// TODO: make sure the section exists
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let section = &mut self.sections[section_index as usize];
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let chunk_section_pos = ChunkSectionBlockPos::from(pos);
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section.set(chunk_section_pos, state);
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}
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}
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impl McBufWritable for Chunk {
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fn write_into(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
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for section in &self.sections {
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section.write_into(buf)?;
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}
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Ok(())
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}
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}
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impl Debug for PartialChunkStorage {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("PartialChunkStorage")
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.field("view_center", &self.view_center)
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.field("chunk_radius", &self.chunk_radius)
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.field("view_range", &self.view_range)
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// .field("chunks", &self.chunks)
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.field("chunks", &format_args!("{} items", self.chunks.len()))
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.finish()
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}
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}
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impl McBufReadable for Section {
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fn read_from(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
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let block_count = u16::read_from(buf)?;
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// this is commented out because the vanilla server is wrong
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// assert!(
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// block_count <= 16 * 16 * 16,
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// "A section has more blocks than what should be possible. This is a bug!"
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// );
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let states = PalettedContainer::read_with_type(buf, &PalettedContainerType::BlockStates)?;
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for i in 0..states.storage.size() {
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if !BlockState::is_valid_state(states.storage.get(i) as u32) {
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return Err(BufReadError::Custom(format!(
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"Invalid block state {} (index {}) found in section.",
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states.storage.get(i),
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i
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)));
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}
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}
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let biomes = PalettedContainer::read_with_type(buf, &PalettedContainerType::Biomes)?;
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Ok(Section {
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block_count,
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states,
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biomes,
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})
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}
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}
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impl McBufWritable for Section {
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fn write_into(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
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self.block_count.write_into(buf)?;
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self.states.write_into(buf)?;
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self.biomes.write_into(buf)?;
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Ok(())
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}
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}
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impl Section {
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fn get(&self, pos: ChunkSectionBlockPos) -> BlockState {
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// TODO: use the unsafe method and do the check earlier
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let state = self
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.states
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.get(pos.x as usize, pos.y as usize, pos.z as usize);
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// if there's an unknown block assume it's air
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BlockState::try_from(state).unwrap_or(BlockState::Air)
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}
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fn get_and_set(&mut self, pos: ChunkSectionBlockPos, state: BlockState) -> BlockState {
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let previous_state =
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self.states
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.get_and_set(pos.x as usize, pos.y as usize, pos.z as usize, state as u32);
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// if there's an unknown block assume it's air
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BlockState::try_from(previous_state).unwrap_or(BlockState::Air)
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}
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fn set(&mut self, pos: ChunkSectionBlockPos, state: BlockState) {
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self.states
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.set(pos.x as usize, pos.y as usize, pos.z as usize, state as u32);
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}
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}
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impl Default for PartialChunkStorage {
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fn default() -> Self {
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Self::new(8)
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}
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}
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impl Default for ChunkStorage {
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fn default() -> Self {
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Self::new(384, -64)
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}
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}
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/// Get the index of where a section is in a chunk based on its y coordinate
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/// and the minimum y coordinate of the world.
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pub fn section_index(y: i32, min_y: i32) -> u32 {
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assert!(y >= min_y, "y ({y}) must be at least {min_y}");
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let min_section_index = min_y.div_floor(16);
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(y.div_floor(16) - min_section_index) as u32
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_section_index() {
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assert_eq!(section_index(0, 0), 0);
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assert_eq!(section_index(128, 0), 8);
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assert_eq!(section_index(127, 0), 7);
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assert_eq!(section_index(0, -64), 4);
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assert_eq!(section_index(-64, -64), 0);
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assert_eq!(section_index(-49, -64), 0);
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assert_eq!(section_index(-48, -64), 1);
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assert_eq!(section_index(128, -64), 12);
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}
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#[test]
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fn test_out_of_bounds_y() {
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let mut chunk_storage = ChunkStorage::default();
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let mut partial_chunk_storage = PartialChunkStorage::default();
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partial_chunk_storage.set(
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&ChunkPos { x: 0, z: 0 },
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Some(Arc::new(RwLock::new(Chunk::default()))),
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&mut chunk_storage,
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);
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assert!(chunk_storage
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.get_block_state(&BlockPos { x: 0, y: 319, z: 0 })
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.is_some());
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assert!(chunk_storage
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.get_block_state(&BlockPos { x: 0, y: 320, z: 0 })
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.is_none());
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assert!(chunk_storage
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.get_block_state(&BlockPos { x: 0, y: 338, z: 0 })
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.is_none());
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assert!(chunk_storage
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.get_block_state(&BlockPos { x: 0, y: -64, z: 0 })
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.is_some());
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assert!(chunk_storage
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.get_block_state(&BlockPos { x: 0, y: -65, z: 0 })
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.is_none());
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}
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}
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