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use byteorder::{ByteOrder, LittleEndian};
use hashbrown::{HashMap, HashSet};
use libflate::zlib::{Decoder, Encoder};
use log::info;
use serde::{Deserialize, Serialize};
use std::{
collections::VecDeque,
fs::{self, File},
io::{Read, Write},
path::PathBuf,
};
use crate::{BlockChange, ChunkParams, ChunkUtils, MessageType, Vec2, Vec3, WorldConfig};
use super::{
access::VoxelAccess,
chunk::Chunk,
space::{SpaceBuilder, SpaceParams},
};
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
struct ChunkFileData {
id: String,
voxels: String,
height_map: String,
}
#[derive(Default)]
pub struct Chunks {
pub map: HashMap<Vec2<i32>, Chunk>,
pub to_update: VecDeque<BlockChange>,
pub to_remesh: VecDeque<Vec2<i32>>,
pub to_send: VecDeque<(Vec2<i32>, MessageType)>,
pub to_save: VecDeque<Vec2<i32>>,
pub cache: HashSet<Vec2<i32>>,
config: WorldConfig,
folder: Option<PathBuf>,
}
impl Chunks {
pub fn new(config: &WorldConfig) -> Self {
let folder = if config.saving {
let mut folder = PathBuf::from(&config.save_dir);
folder.push("chunks");
fs::create_dir_all(&folder).expect("Unable to create chunks directory...");
Some(folder)
} else {
None
};
Self {
folder,
config: config.to_owned(),
..Default::default()
}
}
pub fn try_load(&mut self, coords: &Vec2<i32>) -> Option<Chunk> {
if !self.config.saving {
return None;
}
let path = self.get_chunk_file_path(&ChunkUtils::get_chunk_name(coords.0, coords.1));
if let Ok(chunk_data) = File::open(&path) {
let data: ChunkFileData = serde_json::from_reader(chunk_data)
.unwrap_or_else(|_| panic!("Could not load chunk file: {:?}", coords));
let ChunkFileData {
id,
voxels,
height_map,
} = data;
let decode_base64 = |base: String| {
let decoded = base64::decode(base).unwrap();
let mut decoder = Decoder::new(&decoded[..]).unwrap();
let mut buf = Vec::new();
decoder.read_to_end(&mut buf).unwrap();
let mut data = vec![0; buf.len() / 4];
LittleEndian::read_u32_into(&buf, &mut data);
data
};
let mut chunk = Chunk::new(
&id,
coords.0,
coords.1,
&ChunkParams {
max_height: self.config.max_height,
sub_chunks: self.config.sub_chunks,
size: self.config.chunk_size,
},
);
chunk.voxels.data = decode_base64(voxels);
chunk.height_map.data = decode_base64(height_map);
chunk.stage = None;
Some(chunk)
} else {
None
}
}
pub fn save(&self, coords: &Vec2<i32>) -> bool {
if !self.config.saving {
panic!("Calling `chunks.save` when saving mode is not on.");
}
let chunk = if let Some(chunk) = self.get(coords) {
chunk
} else {
return false;
};
let path = self.get_chunk_file_path(&chunk.name);
let mut file = File::create(&path).expect("Could not create chunk file.");
let to_base_64 = |data: &Vec<u32>| {
let mut bytes = vec![0; data.len() * 4];
LittleEndian::write_u32_into(data, &mut bytes);
let mut encoder = Encoder::new(vec![]).unwrap();
encoder.write_all(bytes.as_slice()).unwrap();
let encoded = encoder.finish().into_result().unwrap();
base64::encode(&encoded)
};
let data = ChunkFileData {
id: chunk.id.to_owned(),
voxels: to_base_64(&chunk.voxels.data),
height_map: to_base_64(&chunk.height_map.data),
};
let j = serde_json::to_string(&data).unwrap();
file.write_all(j.as_bytes())
.expect("Unable to write to chunk file.");
true
}
pub fn renew(&mut self, chunk: Chunk) {
self.map.remove(&chunk.coords);
self.map.insert(chunk.coords.to_owned(), chunk);
}
pub fn add(&mut self, chunk: Chunk) {
self.renew(chunk);
}
pub fn raw(&self, coords: &Vec2<i32>) -> Option<&Chunk> {
if !self.is_within_world(coords) {
return None;
}
self.map.get(coords)
}
pub fn raw_mut(&mut self, coords: &Vec2<i32>) -> Option<&mut Chunk> {
if !self.is_within_world(coords) {
return None;
}
self.cache.insert(coords.to_owned());
self.map.get_mut(coords)
}
pub fn get(&self, coords: &Vec2<i32>) -> Option<&Chunk> {
if !self.is_within_world(coords) || !self.is_chunk_ready(coords) {
return None;
}
self.map.get(coords)
}
pub fn get_mut(&mut self, coords: &Vec2<i32>) -> Option<&mut Chunk> {
if !self.is_within_world(coords) || !self.is_chunk_ready(coords) {
return None;
}
self.cache.insert(coords.to_owned());
self.map.get_mut(coords)
}
pub fn raw_chunk_by_voxel(&self, vx: i32, vy: i32, vz: i32) -> Option<&Chunk> {
let coords = ChunkUtils::map_voxel_to_chunk(vx, vy, vz, self.config.chunk_size as usize);
self.raw(&coords)
}
pub fn raw_chunk_by_voxel_mut(&mut self, vx: i32, vy: i32, vz: i32) -> Option<&mut Chunk> {
let coords = ChunkUtils::map_voxel_to_chunk(vx, vy, vz, self.config.chunk_size as usize);
self.raw_mut(&coords)
}
pub fn voxel_affected_chunks(&self, vx: i32, vy: i32, vz: i32) -> Vec<Vec2<i32>> {
let mut neighbors = vec![];
let chunk_size = self.config.chunk_size;
let Vec2(cx, cz) = ChunkUtils::map_voxel_to_chunk(vx, vy, vz, chunk_size);
let Vec3(lx, _, lz) = ChunkUtils::map_voxel_to_chunk_local(vx, vy, vz, chunk_size);
neighbors.push(Vec2(cx, cz));
let a = lx == 0;
let b = lz == 0;
let c = lx == chunk_size - 1;
let d = lz == chunk_size - 1;
if a {
neighbors.push(Vec2(cx - 1, cz))
}
if b {
neighbors.push(Vec2(cx, cz - 1));
}
if c {
neighbors.push(Vec2(cx + 1, cz));
}
if d {
neighbors.push(Vec2(cx, cz + 1));
}
if a && b {
neighbors.push(Vec2(cx - 1, cz - 1));
}
if a && d {
neighbors.push(Vec2(cx - 1, cz + 1));
}
if b && c {
neighbors.push(Vec2(cx + 1, cz - 1));
}
if c && d {
neighbors.push(Vec2(cx + 1, cz + 1));
}
neighbors
.into_iter()
.filter(|coords| self.is_within_world(coords))
.collect()
}
pub fn light_traversed_chunks(&self, coords: &Vec2<i32>) -> Vec<Vec2<i32>> {
let mut list = vec![];
let extended =
(self.config.max_light_level as f32 / self.config.chunk_size as f32).ceil() as i32;
for x in -extended..=extended {
for z in -extended..=extended {
let n_coords = Vec2(coords.0 + x, coords.1 + z);
if self.is_within_world(&n_coords) {
list.push(n_coords);
}
}
}
list
}
pub fn make_space<'a>(&'a self, coords: &Vec2<i32>, margin: usize) -> SpaceBuilder<'a> {
SpaceBuilder {
chunks: self,
coords: coords.to_owned(),
params: SpaceParams {
margin,
chunk_size: self.config.chunk_size,
sub_chunks: self.config.sub_chunks,
max_height: self.config.max_height,
max_light_level: self.config.max_light_level,
},
needs_voxels: false,
needs_lights: false,
needs_height_maps: false,
strict: false,
}
}
pub fn is_within_world(&self, coords: &Vec2<i32>) -> bool {
coords.0 >= self.config.min_chunk[0]
&& coords.0 <= self.config.max_chunk[0]
&& coords.1 >= self.config.min_chunk[1]
&& coords.1 <= self.config.max_chunk[1]
}
pub fn is_chunk_ready(&self, coords: &Vec2<i32>) -> bool {
if let Some(chunk) = self.raw(coords) {
if chunk.stage.is_some() {
return false;
}
if chunk.meshes.is_none() {
return false;
}
return true;
}
false
}
pub fn clear_cache(&mut self) {
self.cache.clear();
}
fn get_chunk_file_path(&self, chunk_name: &str) -> PathBuf {
let mut path = self.folder.clone().unwrap();
path.push(format!("{}.json", chunk_name));
path
}
fn add_updated_level_at(&mut self, vx: i32, vy: i32, vz: i32) {
self.voxel_affected_chunks(vx, vy, vz)
.into_iter()
.for_each(|coords| {
if let Some(neighbor) = self.raw_mut(&coords) {
neighbor.add_updated_level(vy);
}
});
}
}
impl VoxelAccess for Chunks {
fn get_raw_voxel(&self, vx: i32, vy: i32, vz: i32) -> u32 {
if let Some(chunk) = self.raw_chunk_by_voxel(vx, vy, vz) {
chunk.get_raw_voxel(vx, vy, vz)
} else {
0
}
}
fn set_raw_voxel(&mut self, vx: i32, vy: i32, vz: i32, id: u32) -> bool {
if let Some(chunk) = self.raw_chunk_by_voxel_mut(vx, vy, vz) {
chunk.set_raw_voxel(vx, vy, vz, id);
self.add_updated_level_at(vx, vy, vz);
return true;
}
false
}
fn get_raw_light(&self, vx: i32, vy: i32, vz: i32) -> u32 {
if let Some(chunk) = self.raw_chunk_by_voxel(vx, vy, vz) {
chunk.get_raw_light(vx, vy, vz)
} else {
0
}
}
fn set_raw_light(&mut self, vx: i32, vy: i32, vz: i32, level: u32) -> bool {
if let Some(chunk) = self.raw_chunk_by_voxel_mut(vx, vy, vz) {
chunk.set_raw_light(vx, vy, vz, level);
self.add_updated_level_at(vx, vy, vz);
return true;
}
false
}
fn get_sunlight(&self, vx: i32, vy: i32, vz: i32) -> u32 {
if let Some(chunk) = self.raw_chunk_by_voxel(vx, vy, vz) {
chunk.get_sunlight(vx, vy, vz)
} else {
return if vy < 0 {
0
} else {
self.config.max_light_level
};
}
}
fn get_max_height(&self, vx: i32, vz: i32) -> u32 {
if let Some(chunk) = self.raw_chunk_by_voxel(vx, 0, vz) {
chunk.get_max_height(vx, vz)
} else {
0
}
}
fn set_max_height(&mut self, vx: i32, vz: i32, height: u32) -> bool {
if let Some(chunk) = self.raw_chunk_by_voxel_mut(vx, 0, vz) {
chunk.set_max_height(vx, vz, height);
return true;
}
false
}
fn contains(&self, vx: i32, vy: i32, vz: i32) -> bool {
self.raw_chunk_by_voxel(vx, vy, vz).is_some()
}
}