valence/examples/conway.rs

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use std::collections::HashMap;
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use std::mem;
use std::net::SocketAddr;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Mutex;
use log::LevelFilter;
use num::Integer;
use rayon::iter::{IndexedParallelIterator, IntoParallelRefMutIterator, ParallelIterator};
use valence::biome::Biome;
use valence::block::BlockState;
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use valence::client::{ClientId, Event, Hand};
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use valence::config::{Config, ServerListPing};
use valence::dimension::{Dimension, DimensionId};
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use valence::entity::data::Pose;
use valence::entity::{EntityData, EntityId, EntityKind};
use valence::server::{Server, SharedServer, ShutdownResult};
use valence::text::{Color, TextFormat};
use valence::{async_trait, ident};
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pub fn main() -> ShutdownResult {
env_logger::Builder::new()
.filter_module("valence", LevelFilter::Trace)
.parse_default_env()
.init();
valence::start_server(Game {
player_count: AtomicUsize::new(0),
state: Mutex::new(State {
player_entities: HashMap::new(),
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board: vec![false; SIZE_X * SIZE_Z].into_boxed_slice(),
board_buf: vec![false; SIZE_X * SIZE_Z].into_boxed_slice(),
}),
})
}
struct Game {
player_count: AtomicUsize,
state: Mutex<State>,
}
struct State {
player_entities: HashMap<ClientId, EntityId>,
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board: Box<[bool]>,
board_buf: Box<[bool]>,
}
const MAX_PLAYERS: usize = 10;
const SIZE_X: usize = 100;
const SIZE_Z: usize = 100;
const BOARD_Y: i32 = 50;
#[async_trait]
impl Config for Game {
fn max_connections(&self) -> usize {
// We want status pings to be successful even if the server is full.
MAX_PLAYERS + 64
}
fn online_mode(&self) -> bool {
// You'll want this to be true on real servers.
false
}
fn dimensions(&self) -> Vec<Dimension> {
vec![Dimension {
fixed_time: Some(6000),
..Dimension::default()
}]
}
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fn biomes(&self) -> Vec<Biome> {
vec![Biome {
name: ident!("valence:default_biome"),
grass_color: Some(0x00ff00),
..Biome::default()
}]
}
async fn server_list_ping(
&self,
_server: &SharedServer,
_remote_addr: SocketAddr,
) -> ServerListPing {
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ServerListPing::Respond {
online_players: self.player_count.load(Ordering::SeqCst) as i32,
max_players: MAX_PLAYERS as i32,
description: "Hello Valence!".color(Color::AQUA),
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favicon_png: Some(include_bytes!("../assets/favicon.png")),
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}
}
fn init(&self, server: &mut Server) {
let world = server.worlds.create(DimensionId::default()).1;
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world.meta.set_flat(true);
for chunk_z in -2..Integer::div_ceil(&(SIZE_X as i32), &16) + 2 {
for chunk_x in -2..Integer::div_ceil(&(SIZE_Z as i32), &16) + 2 {
world.chunks.create((chunk_x as i32, chunk_z as i32));
}
}
}
fn update(&self, server: &mut Server) {
let (world_id, world) = server.worlds.iter_mut().next().unwrap();
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let spawn_pos = [
SIZE_X as f64 / 2.0,
BOARD_Y as f64 + 1.0,
SIZE_Z as f64 / 2.0,
];
let State {
player_entities,
board,
board_buf,
} = &mut *self.state.lock().unwrap();
server.clients.retain(|client_id, client| {
if client.created_tick() == server.shared.current_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;
}
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client.spawn(world_id);
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client.teleport(spawn_pos, 0.0, 0.0);
world.meta.player_list_mut().insert(
client.uuid(),
client.username().to_owned(),
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client.textures().cloned(),
client.game_mode(),
0,
None,
);
player_entities.insert(
client_id,
server
.entities
.create_with_uuid(EntityKind::Player, client.uuid())
.unwrap()
.0,
);
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client.send_message("Welcome to Conway's game of life in Minecraft!".italic());
client.send_message("Hold the left mouse button to bring blocks to life.".italic());
}
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if client.is_disconnected() {
self.player_count.fetch_sub(1, Ordering::SeqCst);
let id = player_entities.remove(&client_id).unwrap();
server.entities.delete(id);
world.meta.player_list_mut().remove(client.uuid());
return false;
}
true
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});
for (client_id, client) in server.clients.iter_mut() {
let player = server
.entities
.get_mut(player_entities[&client_id])
.unwrap();
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while let Some(event) = client.pop_event() {
match event {
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Event::Digging { position, .. } => {
if (0..SIZE_X as i32).contains(&position.x)
&& (0..SIZE_Z as i32).contains(&position.z)
&& position.y == BOARD_Y
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{
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board[position.x as usize + position.z as usize * SIZE_X] = true;
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}
}
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Event::Movement { .. } => {
if client.position().y <= 0.0 {
client.teleport(spawn_pos, client.yaw(), client.pitch());
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}
player.set_world(client.world());
player.set_position(client.position());
player.set_yaw(client.yaw());
player.set_head_yaw(client.yaw());
player.set_pitch(client.pitch());
player.set_on_ground(client.on_ground());
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}
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Event::StartSneaking => {
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if let EntityData::Player(e) = player.data_mut() {
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e.set_crouching(true);
e.set_pose(Pose::Sneaking);
}
}
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Event::StopSneaking => {
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if let EntityData::Player(e) = player.data_mut() {
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e.set_pose(Pose::Standing);
e.set_crouching(false);
}
}
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Event::StartSprinting => {
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if let EntityData::Player(e) = player.data_mut() {
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e.set_sprinting(true);
}
}
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Event::StopSprinting => {
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if let EntityData::Player(e) = player.data_mut() {
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e.set_sprinting(false);
}
}
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Event::ArmSwing(hand) => {
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if let EntityData::Player(e) = player.data_mut() {
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match hand {
Hand::Main => e.trigger_swing_main_arm(),
Hand::Off => e.trigger_swing_offhand(),
}
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}
}
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_ => {}
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}
}
}
if server.shared.current_tick() % 4 != 0 {
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return;
}
board_buf.par_iter_mut().enumerate().for_each(|(i, cell)| {
let cx = (i % SIZE_X) as i32;
let cz = (i / SIZE_Z) as i32;
let mut live_count = 0;
for z in cz - 1..=cz + 1 {
for x in cx - 1..=cx + 1 {
if !(x == cx && z == cz) {
let i = x.rem_euclid(SIZE_X as i32) as usize
+ z.rem_euclid(SIZE_Z as i32) as usize * SIZE_X;
if board[i] {
live_count += 1;
}
}
}
}
if board[cx as usize + cz as usize * SIZE_X] {
*cell = (2..=3).contains(&live_count);
} else {
*cell = live_count == 3;
}
});
mem::swap(board, board_buf);
let min_y = server.shared.dimensions().next().unwrap().1.min_y;
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for chunk_x in 0..Integer::div_ceil(&SIZE_X, &16) {
for chunk_z in 0..Integer::div_ceil(&SIZE_Z, &16) {
let chunk = world
.chunks
.get_mut((chunk_x as i32, chunk_z as i32))
.unwrap();
for x in 0..16 {
for z in 0..16 {
let cell_x = chunk_x * 16 + x;
let cell_z = chunk_z * 16 + z;
if cell_x < SIZE_X && cell_z < SIZE_Z {
let b = if board[cell_x + cell_z * SIZE_X] {
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BlockState::GRASS_BLOCK
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} else {
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BlockState::DIRT
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};
chunk.set_block_state(x, (BOARD_Y - min_y) as usize, z, b);
}
}
}
}
}
}
}