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Copy pathitem.rs
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255 lines (215 loc) · 9.03 KB
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//! Handling of item entities.
use feather_core::anvil::entity::{
BaseEntityData, EntityData, EntityDataKind, ItemData, ItemEntityData,
};
use feather_core::entitymeta::{EntityMetadata, META_INDEX_ITEM_SLOT};
use feather_core::inventory::Inventory;
use feather_core::items::{Item, ItemStack};
use feather_core::network::packets::SpawnObject;
use feather_core::network::Packet;
use feather_core::util::{Position, Vec3d};
use feather_server_types::{
ComponentSerializer, EntityId, EntityLoaderRegistration, EntitySpawnEvent, Game,
InventoryUpdateEvent, ItemCollectEvent, ItemDropEvent, PhysicsBuilder, Player,
SpawnPacketCreator, Uuid, Velocity, PLAYER_EYE_HEIGHT, TPS,
};
use feather_server_util::{degrees_to_stops, nearby_entities, protocol_velocity};
use fecs::{component, EntityBuilder, EntityRef, IntoQuery, Read, World, Write};
use parking_lot::Mutex;
use rand::Rng;
use std::sync::atomic::{AtomicBool, Ordering};
/// Component which stores the world time at which an item
/// will be collectable.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct CollectableAt(u64);
/// Component used to store whether an item has been collected/
/// removed on a given tick. Used by `item_collect` and `item_merge`
/// systems.
#[derive(Debug)]
struct IsRemoved(AtomicBool);
inventory::submit! {
EntityLoaderRegistration::new(EntityDataKind::Item, &load)
}
/// Handler for spawning an item entity when
/// an item is dropped.
#[fecs::event_handler]
pub fn on_item_drop_spawn_item_entity(event: &ItemDropEvent, game: &mut Game, world: &mut World) {
// Spawn item entity.
// Position is player's eye height minus 0.3
let mut pos = {
let player_pos =
*world.get::<Position>(event.player) + glm::vec3(0.0, PLAYER_EYE_HEIGHT, 0.0);
player_pos - glm::vec3(0.0f64, 0.3, 0.0)
};
pos.on_ground = false;
let mut rng = game.rng();
// This velocity calculation was sourced from Glowstone's
// work. See https://github.com/GlowstoneMC/Glowstone/blob/dev/src/main/java/net/glowstone/entity/GlowHumanEntity.java
// (method drop(ItemStack stack)) for their code.
let velocity = {
let mut vel = glm::DVec3::from_column_slice(&(pos.direction() * 0.3).into_array());
let rand_offset = 0.02;
let x = rng.gen_range(0.0, rand_offset) - rand_offset / 2.0;
let y = rng.gen_range(0.0, 0.12);
let z = rng.gen_range(0.0, rand_offset) - rand_offset / 2.0;
vel += glm::vec3(x, y, z);
vel
};
drop(rng);
let entity = create(event.stack, game.tick_count + TPS)
.with(pos)
.with(Velocity(velocity))
.build()
.spawn_in(world);
game.handle(world, EntitySpawnEvent { entity });
}
/// System to add items to player inventories when the player comes near.
#[fecs::system]
pub fn item_collect(game: &mut Game, world: &mut World) {
// run every 1/10 second
if game.tick_count % (TPS / 10) != 0 {
return;
}
let items_to_remove = Mutex::new(vec![]);
let inventory_update_events = Mutex::new(vec![]);
let item_collect_events = Mutex::new(vec![]);
// For each player, check for nearby items and try collecting them
// Safety: we only iterate over entities which are players,
// and we only access item entities inside the loop. As such,
// we will not have multiple mutable references to the same component.
unsafe {
<(Read<Position>, Write<Inventory>)>::query()
.filter(component::<Player>())
.par_entities_for_each_unchecked(world.inner(), |(player, (pos, mut inventory))| {
let inventory: &mut Inventory = &mut *inventory;
let nearby_entities = nearby_entities(world, game, *pos, glm::vec3(1.0, 1.0, 1.0));
let nearby_items = nearby_entities.iter().filter_map(|entity| {
world
.try_get::<CollectableAt>(*entity)
.map(|collectable_at| {
if collectable_at.0 <= game.time.world_age() {
Some(*entity)
} else {
None
}
})
.flatten()
});
for item in nearby_items {
debug_assert!(!world.has::<Player>(item));
// try to mark this item is collected
// (this ensures another thread has not collected it
// as well, which makes the mutable access below
// safe)
let is_removed = world.get::<IsRemoved>(item);
if !is_removed.0.compare_and_swap(false, true, Ordering::AcqRel) {
// we now have unique access to this item and its components.
let mut stack = world.get_mut_unchecked::<ItemStack>(item);
let (slots, stack_remaining) = inventory.collect_item(*stack);
let initial_remaining = stack.amount;
let event = InventoryUpdateEvent { slots, player };
inventory_update_events.lock().push(event);
// update stack
if stack_remaining == 0 {
items_to_remove.lock().push(item);
} else {
stack.amount = stack_remaining;
world
.get_mut_unchecked::<EntityMetadata>(item)
.set(META_INDEX_ITEM_SLOT, Some(*stack));
}
item_collect_events.lock().push(ItemCollectEvent {
item,
collector: player,
amount: initial_remaining - stack_remaining,
});
}
}
});
}
// Trigger events + deferred entity deletes.
for event in item_collect_events.into_inner() {
game.handle(world, event);
}
for item in items_to_remove.into_inner() {
game.despawn(item, world);
}
for event in inventory_update_events.into_inner() {
game.handle(world, event);
}
// Reset `IsRemoved`.
<Read<IsRemoved>>::query().for_each(world.inner(), |rem| rem.0.store(false, Ordering::Relaxed));
}
/// Returns an entity builder to create an item entity
/// with the given stack and collectable tick.
pub fn create(stack: ItemStack, collectable_at: u64) -> EntityBuilder {
let meta = EntityMetadata::entity_base().with(META_INDEX_ITEM_SLOT, Some(stack));
let collectable_at = CollectableAt(collectable_at);
crate::base()
.with(stack)
.with(IsRemoved(AtomicBool::new(false)))
.with(collectable_at)
.with(SpawnPacketCreator(&create_spawn_packet))
.with(ComponentSerializer(&serialize))
.with(meta)
.with(
PhysicsBuilder::new()
.bbox(0.25, 0.25, 0.25)
.drag(0.98)
.gravity(-0.04)
.build(),
)
}
fn create_spawn_packet(accessor: &EntityRef) -> Box<dyn Packet> {
let position = *accessor.get::<Position>();
let velocity = *accessor.get::<Velocity>();
let entity_id = accessor.get::<EntityId>().0;
let (velocity_x, velocity_y, velocity_z) = protocol_velocity(velocity.0);
let packet = SpawnObject {
entity_id,
object_uuid: Uuid::new_v4(),
ty: 2, // Type 2 for item stack
x: position.x,
y: position.y,
z: position.z,
pitch: degrees_to_stops(position.pitch),
yaw: degrees_to_stops(position.yaw),
data: 1, // Has velocity
velocity_x,
velocity_y,
velocity_z,
};
Box::new(packet)
}
fn serialize(game: &Game, accessor: &EntityRef) -> EntityData {
let vel = accessor.get::<Velocity>().0;
let item = accessor.get::<ItemStack>();
EntityData::Item(ItemEntityData {
entity: BaseEntityData::new(*accessor.get::<Position>(), Vec3d::new(vel.x, vel.y, vel.z)),
age: 0, // todo
pickup_delay: (accessor.get::<CollectableAt>().0 as i64 - game.tick_count as i64).max(0)
as u8,
item: ItemData {
count: item.amount,
item: item.ty.identifier().to_owned(),
},
})
}
fn load(data: EntityData) -> anyhow::Result<EntityBuilder> {
match data {
EntityData::Item(data) => {
let pos = data.entity.read_position()?;
let vel = data.entity.read_velocity()?;
let stack = ItemStack::new(
Item::from_identifier(&data.item.item)
.ok_or_else(|| anyhow::anyhow!("invalid item {}", data.item.item))?,
data.item.count,
);
let collectable_at = data.pickup_delay;
Ok(create(stack, collectable_at as u64)
.with(pos)
.with(Velocity(glm::vec3(vel.x, vel.y, vel.z))))
}
_ => panic!("attempted to use item::load to load a non-item"),
}
}
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