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use std::{
ops::{Index, IndexMut},
rc::Rc,
sync::Arc,
};
use super::{
component::{Component, ComponentTypeId},
UnknownComponentStorage,
};
use crate::internals::{
entity::Entity,
event::{Event, Subscriber, Subscribers},
query::filter::{FilterResult, LayoutFilter},
};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
#[repr(transparent)]
pub struct ArchetypeIndex(pub u32);
impl Index<ArchetypeIndex> for [Archetype] {
type Output = Archetype;
fn index(&self, index: ArchetypeIndex) -> &Self::Output {
&self[index.0 as usize]
}
}
impl IndexMut<ArchetypeIndex> for [Archetype] {
fn index_mut(&mut self, index: ArchetypeIndex) -> &mut Self::Output {
&mut self[index.0 as usize]
}
}
impl Index<ArchetypeIndex> for Vec<Archetype> {
type Output = Archetype;
fn index(&self, index: ArchetypeIndex) -> &Self::Output {
&self[index.0 as usize]
}
}
impl IndexMut<ArchetypeIndex> for Vec<Archetype> {
fn index_mut(&mut self, index: ArchetypeIndex) -> &mut Self::Output {
&mut self[index.0 as usize]
}
}
#[derive(Debug)]
pub struct Archetype {
index: ArchetypeIndex,
entities: Vec<Entity>,
layout: Arc<EntityLayout>,
subscribers: Subscribers,
}
impl Archetype {
pub(crate) fn new(
index: ArchetypeIndex,
layout: EntityLayout,
mut subscribers: Subscribers,
) -> Self {
subscribers.send(Event::ArchetypeCreated(index));
Self {
index,
layout: Arc::new(layout),
entities: Vec::new(),
subscribers,
}
}
pub fn index(&self) -> ArchetypeIndex {
self.index
}
pub fn layout(&self) -> &Arc<EntityLayout> {
&self.layout
}
pub fn entities(&self) -> &[Entity] {
&self.entities
}
pub(crate) fn push(&mut self, entity: Entity) {
self.entities.push(entity);
self.subscribers
.send(Event::EntityInserted(entity, self.index));
}
pub(crate) fn reserve(&mut self, additional: usize) {
self.entities.reserve(additional)
}
pub(crate) fn swap_remove(&mut self, entity_index: usize) -> Entity {
let removed = self.entities.swap_remove(entity_index);
self.subscribers
.send(Event::EntityRemoved(removed, self.index));
removed
}
pub(crate) fn subscribe(&mut self, subscriber: Subscriber) {
subscriber.send(Event::ArchetypeCreated(self.index));
for entity in &self.entities {
subscriber.send(Event::EntityInserted(*entity, self.index));
}
self.subscribers.push(subscriber);
}
pub(crate) fn drain(&mut self) -> Vec<Entity> {
let mut entities = Vec::new();
std::mem::swap(&mut self.entities, &mut entities);
for entity in &entities {
self.subscribers
.send(Event::EntityRemoved(*entity, self.index));
}
entities
}
}
impl Drop for Archetype {
fn drop(&mut self) {
for entity in &self.entities {
self.subscribers
.send(Event::EntityRemoved(*entity, self.index));
}
}
}
#[derive(Default, Debug, Clone)]
pub struct EntityLayout {
components: Vec<ComponentTypeId>,
component_constructors: Vec<fn() -> Box<dyn UnknownComponentStorage>>,
}
impl EntityLayout {
pub fn new() -> Self {
Self::default()
}
pub fn register_component<T: Component>(&mut self) {
let type_id = ComponentTypeId::of::<T>();
assert!(
!self.components.contains(&type_id),
"only one component of a given type may be attached to a single entity"
);
self.components.push(type_id);
self.component_constructors
.push(|| Box::new(T::Storage::default()));
}
pub unsafe fn register_component_raw(
&mut self,
type_id: ComponentTypeId,
f: fn() -> Box<dyn UnknownComponentStorage>,
) {
assert!(
!self.components.contains(&type_id),
"only one component of a given type may be attached to a single entity"
);
self.components.push(type_id);
self.component_constructors.push(f);
}
pub fn component_types(&self) -> &[ComponentTypeId] {
&self.components
}
#[doc(hidden)]
pub fn component_constructors(&self) -> &[fn() -> Box<dyn UnknownComponentStorage>] {
&self.component_constructors
}
pub fn has_component<T: Component>(&self) -> bool {
self.has_component_by_id(ComponentTypeId::of::<T>())
}
pub fn has_component_by_id(&self, type_id: ComponentTypeId) -> bool {
self.components.contains(&type_id)
}
}
impl LayoutFilter for EntityLayout {
fn matches_layout(&self, components: &[ComponentTypeId]) -> FilterResult {
FilterResult::Match(
components.len() == self.components.len()
&& self.components.iter().all(|t| components.contains(t)),
)
}
}
impl LayoutFilter for Rc<EntityLayout> {
fn matches_layout(&self, components: &[ComponentTypeId]) -> FilterResult {
FilterResult::Match(
components.len() == self.components.len()
&& self.components.iter().all(|t| components.contains(t)),
)
}
}