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spawn.rs
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185 lines (159 loc) · 4.99 KB
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use crate::entity::ItemComponent;
use crate::entity::Metadata;
use crate::entity::{EntitySpawnEvent, EntityType, PositionComponent, VelocityComponent};
use crate::util::Util;
use crate::{TickCount, TPS};
use crossbeam::queue::SegQueue;
use feather_core::{ItemStack, Position};
use glm::DVec3;
use shrev::EventChannel;
use specs::{Entities, Read, System, Write, WriteStorage};
/// This type implements a convenient
/// way to spawn entities without having to
/// add a ton of system dependencies.
///
/// It works by queueing mob spawn requests
/// in an internal vector and lazily
/// creating the entities during the
/// handling phase of the dispatcher.
///
/// # Note
/// This resource is used as a subset
/// of the `Util` struct. Never use the `Spawner`
/// directly.
#[derive(Default, Debug)]
pub struct Spawner {
/// The internal queue of spawn requests.
queue: SegQueue<SpawnRequest>,
}
impl Spawner {
/// Queues an item entity to be spawned.
pub fn spawn_item(&self, position: Position, velocity: DVec3, item: ItemStack) {
let meta = {
let mut meta_item = crate::entity::metadata::Item::default();
meta_item.set_item(Some(item.clone()));
Metadata::Item(meta_item)
};
let request = SpawnRequest {
ty: EntityType::Item,
position,
velocity,
meta,
extra: Extra::Item(item),
};
self.queue.push(request);
}
}
#[derive(Debug, Clone)]
struct SpawnRequest {
ty: EntityType,
position: Position,
velocity: DVec3,
meta: Metadata,
extra: Extra,
}
#[derive(Debug, Clone)]
enum Extra {
Item(ItemStack),
}
/// System for spawning queued requests in the `Spawner`.
pub struct SpawnerSystem;
impl<'a> System<'a> for SpawnerSystem {
type SystemData = (
Read<'a, Util>,
WriteStorage<'a, PositionComponent>,
WriteStorage<'a, VelocityComponent>,
WriteStorage<'a, Metadata>,
WriteStorage<'a, EntityType>,
WriteStorage<'a, ItemComponent>,
Write<'a, EventChannel<EntitySpawnEvent>>,
Read<'a, TickCount>,
Entities<'a>,
);
fn run(&mut self, data: Self::SystemData) {
let (
util,
mut positions,
mut velocities,
mut metadatas,
mut types,
mut item_markers,
mut spawn_events,
tick,
entities,
) = data;
// Handle spawn requests
while let Ok(request) = util.spawner.queue.pop() {
let entity = entities.create();
positions
.insert(
entity,
PositionComponent {
current: request.position,
previous: request.position,
},
)
.unwrap();
velocities
.insert(entity, VelocityComponent(request.velocity))
.unwrap();
metadatas.insert(entity, request.meta).unwrap();
types.insert(entity, request.ty).unwrap();
match request.ty {
EntityType::Item => {
item_markers
.insert(
entity,
ItemComponent {
collectable_at: tick.0 + TPS,
},
)
.unwrap();
}
_ => unimplemented!(),
}
// Trigger event
let event = EntitySpawnEvent {
entity,
ty: request.ty,
};
spawn_events.single_write(event);
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::entity::EntitySpawnEvent;
use crate::testframework as t;
use feather_core::Item;
#[test]
fn test_spawn_item() {
let spawner = Spawner::default();
let position = position!(0.0, 10.0, 1.04);
let velocity = glm::vec3(104.0, 4.0, 10.0);
let item = ItemStack::new(Item::EnderPearl, 4);
spawner.spawn_item(position, velocity, item);
let request = spawner.queue.pop().unwrap();
assert_eq!(request.ty, EntityType::Item);
assert_eq!(request.position, position);
assert_eq!(request.velocity, velocity);
}
#[test]
fn test_spawner_system() {
let (w, mut d) = t::builder().with(SpawnerSystem, "").build();
let position = position!(0.0, 10.0, 1.04);
let velocity = glm::vec3(104.0, 4.0, 10.0);
let item = ItemStack::new(Item::EnderPearl, 4);
let mut reader = t::reader(&w);
{
let util = w.fetch::<Util>();
util.spawn_item(position, velocity, item);
}
d.dispatch(&w);
let events = t::triggered_events::<EntitySpawnEvent>(&w, &mut reader);
assert_eq!(events.len(), 1);
let first = events.first().unwrap();
assert_eq!(first.ty, EntityType::Item);
}
}