59 lines
1.4 KiB
Rust
59 lines
1.4 KiB
Rust
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use std::collections::{HashMap, VecDeque};
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use crate::Record;
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub struct EntityId(pub u64);
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub struct Entity {
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pub(crate) id: EntityId,
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pub(crate) generation: u64,
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}
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pub struct Entities {
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pub(crate) arch_index: HashMap<EntityId, Record>,
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dead: VecDeque<Entity>,
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next_id: EntityId,
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}
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impl Default for Entities {
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fn default() -> Self {
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Self {
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arch_index: Default::default(),
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dead: Default::default(),
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next_id: EntityId(0),
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}
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}
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}
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impl Entities {
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pub fn reserve(&mut self) -> Entity {
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match self.dead.pop_front() {
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Some(mut e) => {
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e.generation += 1;
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e
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}
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None => {
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println!("id is {}", self.next_id.0);
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let new_id = self.next_id;
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self.next_id.0 += 1;
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Entity {
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id: new_id,
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generation: 0,
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}
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}
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}
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}
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/// Retrieves the Archetype Record for the entity
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pub(crate) fn entity_record(&self, entity: Entity) -> Option<Record> {
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self.arch_index.get(&entity.id).cloned()
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}
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pub(crate) fn insert_entity_record(&mut self, entity: Entity, record: Record) {
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self.arch_index.insert(entity.id, record);
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}
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}
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