valence/examples/conway.rs
Ryan Johnson ce457a3d20
Add prelude module to valence. (#128)
This removes boilerplate code in the examples and reduces friction when getting started.
2022-10-21 04:54:32 -07:00

300 lines
10 KiB
Rust

use std::mem;
use std::net::SocketAddr;
use std::sync::atomic::{AtomicUsize, Ordering};
use log::LevelFilter;
use num::Integer;
use rayon::prelude::*;
use valence::client::Hand;
use valence::entity::types::Pose;
use valence::prelude::*;
// TODO: re-export this somewhere in valence.
use valence::protocol::packets::s2c::play::SoundCategory;
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),
},
ServerState {
player_list: None,
paused: false,
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,
}
struct ServerState {
player_list: Option<PlayerListId>,
paused: bool,
board: Box<[bool]>,
board_buf: Box<[bool]>,
}
#[derive(Default)]
struct ClientState {
entity_id: EntityId,
}
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 {
type ServerState = ServerState;
type ClientState = ClientState;
type EntityState = ();
type WorldState = ();
type ChunkState = ();
type PlayerListState = ();
fn max_connections(&self) -> usize {
// We want status pings to be successful even if the server is full.
MAX_PLAYERS + 64
}
fn dimensions(&self) -> Vec<Dimension> {
vec![Dimension {
fixed_time: Some(6000),
..Dimension::default()
}]
}
fn biomes(&self) -> Vec<Biome> {
vec![Biome {
name: ident!("plains"),
grass_color: Some(0x00ff00),
..Biome::default()
}]
}
async fn server_list_ping(
&self,
_server: &SharedServer<Self>,
_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<Self>) {
let world = server.worlds.insert(DimensionId::default(), ()).1;
server.state.player_list = Some(server.player_lists.insert(()).0);
for chunk_z in -2..Integer::div_ceil(&(SIZE_Z as i32), &16) + 2 {
for chunk_x in -2..Integer::div_ceil(&(SIZE_X as i32), &16) + 2 {
world.chunks.insert(
[chunk_x as i32, chunk_z as i32],
UnloadedChunk::default(),
(),
);
}
}
}
fn update(&self, server: &mut Server<Self>) {
let (world_id, world) = server.worlds.iter_mut().next().unwrap();
let spawn_pos = [
SIZE_X as f64 / 2.0,
BOARD_Y as f64 + 1.0,
SIZE_Z as f64 / 2.0,
];
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.entity_id = id,
None => {
client.disconnect("Conflicting UUID");
return false;
}
}
client.spawn(world_id);
client.set_flat(true);
client.teleport(spawn_pos, 0.0, 0.0);
client.set_player_list(server.state.player_list.clone());
if let Some(id) = &server.state.player_list {
server.player_lists.get_mut(id).insert(
client.uuid(),
client.username(),
client.textures().cloned(),
client.game_mode(),
0,
None,
);
}
client.send_message("Welcome to Conway's game of life in Minecraft!".italic());
client.send_message(
"Sneak and hold the left mouse button to bring blocks to life.".italic(),
);
}
if client.is_disconnected() {
self.player_count.fetch_sub(1, Ordering::SeqCst);
server.entities.remove(client.state.entity_id);
if let Some(id) = &server.state.player_list {
server.player_lists.get_mut(id).remove(client.uuid());
}
return false;
}
let player = server.entities.get_mut(client.state.entity_id).unwrap();
if client.position().y <= 0.0 {
client.teleport(spawn_pos, client.yaw(), client.pitch());
server.state.board.fill(false);
}
while let Some(event) = handle_event_default(client, player) {
match event {
ClientEvent::Digging { position, .. } => {
if (0..SIZE_X as i32).contains(&position.x)
&& (0..SIZE_Z as i32).contains(&position.z)
&& position.y == BOARD_Y
{
let index = position.x as usize + position.z as usize * SIZE_X;
if !server.state.board[index] {
client.play_sound(
ident!("minecraft:block.note_block.banjo"),
SoundCategory::Block,
Vec3::<i32>::from(position).as_(),
0.5f32,
1f32,
);
}
server.state.board[index] = true;
}
}
ClientEvent::InteractWithBlock { hand, .. } => {
if hand == Hand::Main {
client.send_message("I said left click, not right click!".italic());
}
}
_ => {}
}
}
if let TrackedData::Player(data) = player.data() {
let sneaking = data.get_pose() == Pose::Sneaking;
if sneaking != server.state.paused {
server.state.paused = sneaking;
client.play_sound(
ident!("block.note_block.pling"),
SoundCategory::Block,
client.position(),
0.5f32,
if sneaking { 0.5f32 } else { 1f32 },
);
}
}
// Display Playing in green or Paused in red
client.set_action_bar(if server.state.paused {
"Paused".color(Color::RED)
} else {
"Playing".color(Color::GREEN)
});
true
});
if !server.state.paused && server.shared.current_tick() % 2 == 0 {
server
.state
.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 server.state.board[i] {
live_count += 1;
}
}
}
}
if server.state.board[cx as usize + cz as usize * SIZE_X] {
*cell = (2..=3).contains(&live_count);
} else {
*cell = live_count == 3;
}
});
mem::swap(&mut server.state.board, &mut server.state.board_buf);
}
let min_y = world.chunks.min_y();
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 server.state.board[cell_x + cell_z * SIZE_X] {
BlockState::GRASS_BLOCK
} else {
BlockState::DIRT
};
chunk.set_block_state(x, (BOARD_Y - min_y) as usize, z, b);
}
}
}
}
}
}
}