mirror of
https://github.com/bevyengine/bevy
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f5039a476d
# Objective - Calling .id() has no purpose unless you use the Entity returned - This is an easy source of confusion for beginners. - This is easily missed during refactors. ## Solution - Mark the appropriate methods as #[must_use]
750 lines
26 KiB
Rust
750 lines
26 KiB
Rust
use crate::{
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archetype::{Archetype, ArchetypeId, Archetypes},
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bundle::{Bundle, BundleInfo},
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change_detection::Ticks,
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component::{Component, ComponentId, ComponentTicks, Components, StorageType},
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entity::{Entities, Entity, EntityLocation},
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storage::{SparseSet, Storages},
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world::{Mut, World},
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};
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use std::any::TypeId;
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pub struct EntityRef<'w> {
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world: &'w World,
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entity: Entity,
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location: EntityLocation,
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}
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impl<'w> EntityRef<'w> {
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#[inline]
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pub(crate) fn new(world: &'w World, entity: Entity, location: EntityLocation) -> Self {
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Self {
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world,
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entity,
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location,
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}
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}
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#[inline]
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#[must_use = "Omit the .id() call if you do not need to store the `Entity` identifier."]
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pub fn id(&self) -> Entity {
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self.entity
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}
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#[inline]
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pub fn location(&self) -> EntityLocation {
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self.location
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}
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#[inline]
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pub fn archetype(&self) -> &Archetype {
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&self.world.archetypes[self.location.archetype_id]
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}
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#[inline]
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pub fn world(&mut self) -> &World {
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self.world
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}
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#[inline]
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pub fn contains<T: Component>(&self) -> bool {
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self.contains_type_id(TypeId::of::<T>())
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}
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#[inline]
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pub fn contains_id(&self, component_id: ComponentId) -> bool {
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contains_component_with_id(self.world, component_id, self.location)
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}
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#[inline]
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pub fn contains_type_id(&self, type_id: TypeId) -> bool {
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contains_component_with_type(self.world, type_id, self.location)
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}
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#[inline]
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pub fn get<T: Component>(&self) -> Option<&'w T> {
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// SAFE: entity location is valid and returned component is of type T
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unsafe {
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get_component_with_type(self.world, TypeId::of::<T>(), self.entity, self.location)
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.map(|value| &*value.cast::<T>())
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}
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}
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/// # Safety
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/// This allows aliased mutability. You must make sure this call does not result in multiple
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/// mutable references to the same component
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#[inline]
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pub unsafe fn get_unchecked_mut<T: Component>(
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&self,
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last_change_tick: u32,
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change_tick: u32,
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) -> Option<Mut<'w, T>> {
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get_component_and_ticks_with_type(self.world, TypeId::of::<T>(), self.entity, self.location)
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.map(|(value, ticks)| Mut {
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value: &mut *value.cast::<T>(),
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ticks: Ticks {
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component_ticks: &mut *ticks,
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last_change_tick,
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change_tick,
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},
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})
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}
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}
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pub struct EntityMut<'w> {
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world: &'w mut World,
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entity: Entity,
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location: EntityLocation,
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}
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impl<'w> EntityMut<'w> {
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/// # Safety
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/// entity and location _must_ be valid
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#[inline]
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pub(crate) unsafe fn new(
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world: &'w mut World,
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entity: Entity,
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location: EntityLocation,
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) -> Self {
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EntityMut {
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world,
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entity,
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location,
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}
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}
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#[inline]
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#[must_use = "Omit the .id() call if you do not need to store the `Entity` identifier."]
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pub fn id(&self) -> Entity {
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self.entity
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}
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#[inline]
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pub fn location(&self) -> EntityLocation {
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self.location
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}
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#[inline]
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pub fn archetype(&self) -> &Archetype {
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&self.world.archetypes[self.location.archetype_id]
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}
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#[inline]
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pub fn contains<T: Component>(&self) -> bool {
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self.contains_type_id(TypeId::of::<T>())
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}
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#[inline]
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pub fn contains_id(&self, component_id: ComponentId) -> bool {
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contains_component_with_id(self.world, component_id, self.location)
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}
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#[inline]
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pub fn contains_type_id(&self, type_id: TypeId) -> bool {
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contains_component_with_type(self.world, type_id, self.location)
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}
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#[inline]
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pub fn get<T: Component>(&self) -> Option<&'w T> {
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// SAFE: entity location is valid and returned component is of type T
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unsafe {
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get_component_with_type(self.world, TypeId::of::<T>(), self.entity, self.location)
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.map(|value| &*value.cast::<T>())
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}
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}
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#[inline]
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pub fn get_mut<T: Component>(&mut self) -> Option<Mut<'w, T>> {
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// SAFE: world access is unique, entity location is valid, and returned component is of type
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// T
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unsafe {
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get_component_and_ticks_with_type(
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self.world,
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TypeId::of::<T>(),
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self.entity,
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self.location,
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)
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.map(|(value, ticks)| Mut {
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value: &mut *value.cast::<T>(),
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ticks: Ticks {
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component_ticks: &mut *ticks,
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last_change_tick: self.world.last_change_tick(),
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change_tick: self.world.change_tick(),
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},
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})
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}
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}
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/// # Safety
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/// This allows aliased mutability. You must make sure this call does not result in multiple
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/// mutable references to the same component
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#[inline]
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pub unsafe fn get_unchecked_mut<T: Component>(&self) -> Option<Mut<'w, T>> {
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get_component_and_ticks_with_type(self.world, TypeId::of::<T>(), self.entity, self.location)
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.map(|(value, ticks)| Mut {
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value: &mut *value.cast::<T>(),
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ticks: Ticks {
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component_ticks: &mut *ticks,
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last_change_tick: self.world.last_change_tick(),
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change_tick: self.world.read_change_tick(),
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},
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})
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}
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pub fn insert_bundle<T: Bundle>(&mut self, bundle: T) -> &mut Self {
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let change_tick = self.world.change_tick();
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let bundle_info = self
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.world
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.bundles
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.init_info::<T>(&mut self.world.components, &mut self.world.storages);
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let mut bundle_inserter = bundle_info.get_bundle_inserter(
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&mut self.world.entities,
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&mut self.world.archetypes,
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&mut self.world.components,
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&mut self.world.storages,
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self.location.archetype_id,
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change_tick,
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);
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// SAFE: location matches current entity. `T` matches `bundle_info`
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unsafe {
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self.location = bundle_inserter.insert(self.entity, self.location.index, bundle);
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}
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self
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}
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// TODO: move to BundleInfo
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pub fn remove_bundle<T: Bundle>(&mut self) -> Option<T> {
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let archetypes = &mut self.world.archetypes;
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let storages = &mut self.world.storages;
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let components = &mut self.world.components;
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let entities = &mut self.world.entities;
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let removed_components = &mut self.world.removed_components;
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let bundle_info = self.world.bundles.init_info::<T>(components, storages);
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let old_location = self.location;
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let new_archetype_id = unsafe {
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remove_bundle_from_archetype(
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archetypes,
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storages,
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components,
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old_location.archetype_id,
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bundle_info,
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false,
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)?
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};
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if new_archetype_id == old_location.archetype_id {
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return None;
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}
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let old_archetype = &mut archetypes[old_location.archetype_id];
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let mut bundle_components = bundle_info.component_ids.iter().cloned();
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let entity = self.entity;
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// SAFE: bundle components are iterated in order, which guarantees that the component type
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// matches
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let result = unsafe {
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T::from_components(|| {
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let component_id = bundle_components.next().unwrap();
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// SAFE: entity location is valid and table row is removed below
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take_component(
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components,
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storages,
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old_archetype,
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removed_components,
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component_id,
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entity,
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old_location,
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)
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})
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};
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unsafe {
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Self::move_entity_from_remove::<false>(
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entity,
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&mut self.location,
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old_location.archetype_id,
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old_location,
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entities,
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archetypes,
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storages,
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new_archetype_id,
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);
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}
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Some(result)
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}
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/// Safety: `new_archetype_id` must have the same or a subset of the components
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/// in `old_archetype_id`. Probably more safety stuff too, audit a call to
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/// this fn as if the code here was written inline
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///
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/// when DROP is true removed components will be dropped otherwise they will be forgotten
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///
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// We use a const generic here so that we are less reliant on
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// inlining for rustc to optimize out the `match DROP`
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#[allow(clippy::too_many_arguments)]
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unsafe fn move_entity_from_remove<const DROP: bool>(
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entity: Entity,
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self_location: &mut EntityLocation,
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old_archetype_id: ArchetypeId,
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old_location: EntityLocation,
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entities: &mut Entities,
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archetypes: &mut Archetypes,
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storages: &mut Storages,
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new_archetype_id: ArchetypeId,
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) {
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let old_archetype = &mut archetypes[old_archetype_id];
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let remove_result = old_archetype.swap_remove(old_location.index);
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if let Some(swapped_entity) = remove_result.swapped_entity {
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entities.meta[swapped_entity.id as usize].location = old_location;
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}
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let old_table_row = remove_result.table_row;
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let old_table_id = old_archetype.table_id();
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let new_archetype = &mut archetypes[new_archetype_id];
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let new_location = if old_table_id == new_archetype.table_id() {
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new_archetype.allocate(entity, old_table_row)
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} else {
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let (old_table, new_table) = storages
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.tables
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.get_2_mut(old_table_id, new_archetype.table_id());
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// SAFE: old_table_row exists
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let move_result = if DROP {
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old_table.move_to_and_drop_missing_unchecked(old_table_row, new_table)
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} else {
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old_table.move_to_and_forget_missing_unchecked(old_table_row, new_table)
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};
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// SAFE: move_result.new_row is a valid position in new_archetype's table
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let new_location = new_archetype.allocate(entity, move_result.new_row);
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// if an entity was moved into this entity's table spot, update its table row
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if let Some(swapped_entity) = move_result.swapped_entity {
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let swapped_location = entities.get(swapped_entity).unwrap();
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archetypes[swapped_location.archetype_id]
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.set_entity_table_row(swapped_location.index, old_table_row);
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}
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new_location
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};
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*self_location = new_location;
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entities.meta[entity.id as usize].location = new_location;
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}
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// TODO: move to BundleInfo
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/// Remove any components in the bundle that the entity has.
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pub fn remove_bundle_intersection<T: Bundle>(&mut self) {
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let archetypes = &mut self.world.archetypes;
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let storages = &mut self.world.storages;
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let components = &mut self.world.components;
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let entities = &mut self.world.entities;
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let removed_components = &mut self.world.removed_components;
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let bundle_info = self.world.bundles.init_info::<T>(components, storages);
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let old_location = self.location;
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let new_archetype_id = unsafe {
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remove_bundle_from_archetype(
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archetypes,
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storages,
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components,
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old_location.archetype_id,
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bundle_info,
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true,
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)
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.expect("intersections should always return a result")
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};
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if new_archetype_id == old_location.archetype_id {
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return;
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}
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let old_archetype = &mut archetypes[old_location.archetype_id];
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let entity = self.entity;
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for component_id in bundle_info.component_ids.iter().cloned() {
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if old_archetype.contains(component_id) {
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removed_components
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.get_or_insert_with(component_id, Vec::new)
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.push(entity);
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// Make sure to drop components stored in sparse sets.
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// Dense components are dropped later in `move_to_and_drop_missing_unchecked`.
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if let Some(StorageType::SparseSet) = old_archetype.get_storage_type(component_id) {
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storages
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.sparse_sets
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.get_mut(component_id)
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.unwrap()
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.remove(entity);
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}
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}
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}
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unsafe {
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Self::move_entity_from_remove::<true>(
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entity,
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&mut self.location,
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old_location.archetype_id,
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old_location,
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entities,
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archetypes,
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storages,
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new_archetype_id,
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)
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}
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}
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pub fn insert<T: Component>(&mut self, value: T) -> &mut Self {
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self.insert_bundle((value,))
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}
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pub fn remove<T: Component>(&mut self) -> Option<T> {
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self.remove_bundle::<(T,)>().map(|v| v.0)
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}
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pub fn despawn(self) {
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let world = self.world;
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world.flush();
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let location = world
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.entities
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.free(self.entity)
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.expect("entity should exist at this point.");
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let table_row;
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let moved_entity;
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{
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let archetype = &mut world.archetypes[location.archetype_id];
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for component_id in archetype.components() {
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let removed_components = world
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.removed_components
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.get_or_insert_with(component_id, Vec::new);
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removed_components.push(self.entity);
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}
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let remove_result = archetype.swap_remove(location.index);
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if let Some(swapped_entity) = remove_result.swapped_entity {
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world.entities.meta[swapped_entity.id as usize].location = location;
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}
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table_row = remove_result.table_row;
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for component_id in archetype.sparse_set_components() {
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let sparse_set = world.storages.sparse_sets.get_mut(*component_id).unwrap();
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sparse_set.remove(self.entity);
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}
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// SAFE: table rows stored in archetypes always exist
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moved_entity = unsafe {
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world.storages.tables[archetype.table_id()].swap_remove_unchecked(table_row)
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};
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};
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if let Some(moved_entity) = moved_entity {
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let moved_location = world.entities.get(moved_entity).unwrap();
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world.archetypes[moved_location.archetype_id]
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.set_entity_table_row(moved_location.index, table_row);
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}
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}
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#[inline]
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pub fn world(&mut self) -> &World {
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self.world
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}
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/// # Safety
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/// Caller must not modify the world in a way that changes the current entity's location
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/// If the caller _does_ do something that could change the location, `self.update_location()`
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/// must be called before using any other methods in [`EntityMut`]
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#[inline]
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pub unsafe fn world_mut(&mut self) -> &mut World {
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self.world
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}
|
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|
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/// Updates the internal entity location to match the current location in the internal
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/// [`World`]. This is only needed if the user called [`EntityMut::world`], which enables the
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/// location to change.
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pub fn update_location(&mut self) {
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self.location = self.world.entities().get(self.entity).unwrap();
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}
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}
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// TODO: move to Storages?
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/// # Safety
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/// `entity_location` must be within bounds of the given archetype and `entity` must exist inside
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/// the archetype
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#[inline]
|
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unsafe fn get_component(
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world: &World,
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component_id: ComponentId,
|
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entity: Entity,
|
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location: EntityLocation,
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) -> Option<*mut u8> {
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let archetype = &world.archetypes[location.archetype_id];
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// SAFE: component_id exists and is therefore valid
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let component_info = world.components.get_info_unchecked(component_id);
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match component_info.storage_type() {
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StorageType::Table => {
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let table = &world.storages.tables[archetype.table_id()];
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let components = table.get_column(component_id)?;
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let table_row = archetype.entity_table_row(location.index);
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// SAFE: archetypes only store valid table_rows and the stored component type is T
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Some(components.get_data_unchecked(table_row))
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}
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StorageType::SparseSet => world
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.storages
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.sparse_sets
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.get(component_id)
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.and_then(|sparse_set| sparse_set.get(entity)),
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}
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}
|
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|
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// TODO: move to Storages?
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/// # Safety
|
|
/// Caller must ensure that `component_id` is valid
|
|
#[inline]
|
|
unsafe fn get_component_and_ticks(
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world: &World,
|
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component_id: ComponentId,
|
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entity: Entity,
|
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location: EntityLocation,
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) -> Option<(*mut u8, *mut ComponentTicks)> {
|
|
let archetype = &world.archetypes[location.archetype_id];
|
|
let component_info = world.components.get_info_unchecked(component_id);
|
|
match component_info.storage_type() {
|
|
StorageType::Table => {
|
|
let table = &world.storages.tables[archetype.table_id()];
|
|
let components = table.get_column(component_id)?;
|
|
let table_row = archetype.entity_table_row(location.index);
|
|
// SAFE: archetypes only store valid table_rows and the stored component type is T
|
|
Some((
|
|
components.get_data_unchecked(table_row),
|
|
components.get_ticks_mut_ptr_unchecked(table_row),
|
|
))
|
|
}
|
|
StorageType::SparseSet => world
|
|
.storages
|
|
.sparse_sets
|
|
.get(component_id)
|
|
.and_then(|sparse_set| sparse_set.get_with_ticks(entity)),
|
|
}
|
|
}
|
|
|
|
// TODO: move to Storages?
|
|
/// Moves component data out of storage.
|
|
///
|
|
/// This function leaves the underlying memory unchanged, but the component behind
|
|
/// returned pointer is semantically owned by the caller and will not be dropped in its original location.
|
|
/// Caller is responsible to drop component data behind returned pointer.
|
|
///
|
|
/// # Safety
|
|
/// - `entity_location` must be within bounds of the given archetype and `entity` must exist inside the archetype
|
|
/// - `component_id` must be valid
|
|
/// - The relevant table row **must be removed** by the caller once all components are taken
|
|
#[inline]
|
|
unsafe fn take_component(
|
|
components: &Components,
|
|
storages: &mut Storages,
|
|
archetype: &Archetype,
|
|
removed_components: &mut SparseSet<ComponentId, Vec<Entity>>,
|
|
component_id: ComponentId,
|
|
entity: Entity,
|
|
location: EntityLocation,
|
|
) -> *mut u8 {
|
|
let component_info = components.get_info_unchecked(component_id);
|
|
let removed_components = removed_components.get_or_insert_with(component_id, Vec::new);
|
|
removed_components.push(entity);
|
|
match component_info.storage_type() {
|
|
StorageType::Table => {
|
|
let table = &storages.tables[archetype.table_id()];
|
|
// SAFE: archetypes will always point to valid columns
|
|
let components = table.get_column(component_id).unwrap();
|
|
let table_row = archetype.entity_table_row(location.index);
|
|
// SAFE: archetypes only store valid table_rows and the stored component type is T
|
|
components.get_data_unchecked(table_row)
|
|
}
|
|
StorageType::SparseSet => storages
|
|
.sparse_sets
|
|
.get_mut(component_id)
|
|
.unwrap()
|
|
.remove_and_forget(entity)
|
|
.unwrap(),
|
|
}
|
|
}
|
|
|
|
/// # Safety
|
|
/// `entity_location` must be within bounds of an archetype that exists.
|
|
unsafe fn get_component_with_type(
|
|
world: &World,
|
|
type_id: TypeId,
|
|
entity: Entity,
|
|
location: EntityLocation,
|
|
) -> Option<*mut u8> {
|
|
let component_id = world.components.get_id(type_id)?;
|
|
get_component(world, component_id, entity, location)
|
|
}
|
|
|
|
/// # Safety
|
|
/// `entity_location` must be within bounds of an archetype that exists.
|
|
pub(crate) unsafe fn get_component_and_ticks_with_type(
|
|
world: &World,
|
|
type_id: TypeId,
|
|
entity: Entity,
|
|
location: EntityLocation,
|
|
) -> Option<(*mut u8, *mut ComponentTicks)> {
|
|
let component_id = world.components.get_id(type_id)?;
|
|
get_component_and_ticks(world, component_id, entity, location)
|
|
}
|
|
|
|
fn contains_component_with_type(world: &World, type_id: TypeId, location: EntityLocation) -> bool {
|
|
if let Some(component_id) = world.components.get_id(type_id) {
|
|
contains_component_with_id(world, component_id, location)
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
fn contains_component_with_id(
|
|
world: &World,
|
|
component_id: ComponentId,
|
|
location: EntityLocation,
|
|
) -> bool {
|
|
world.archetypes[location.archetype_id].contains(component_id)
|
|
}
|
|
|
|
/// Removes a bundle from the given archetype and returns the resulting archetype (or None if the
|
|
/// removal was invalid). in the event that adding the given bundle does not result in an Archetype
|
|
/// change. Results are cached in the Archetype Graph to avoid redundant work.
|
|
/// if `intersection` is false, attempting to remove a bundle with components _not_ contained in the
|
|
/// current archetype will fail, returning None. if `intersection` is true, components in the bundle
|
|
/// but not in the current archetype will be ignored
|
|
///
|
|
/// # Safety
|
|
/// `archetype_id` must exist and components in `bundle_info` must exist
|
|
unsafe fn remove_bundle_from_archetype(
|
|
archetypes: &mut Archetypes,
|
|
storages: &mut Storages,
|
|
components: &mut Components,
|
|
archetype_id: ArchetypeId,
|
|
bundle_info: &BundleInfo,
|
|
intersection: bool,
|
|
) -> Option<ArchetypeId> {
|
|
// check the archetype graph to see if the Bundle has been removed from this archetype in the
|
|
// past
|
|
let remove_bundle_result = {
|
|
let current_archetype = &mut archetypes[archetype_id];
|
|
if intersection {
|
|
current_archetype
|
|
.edges()
|
|
.get_remove_bundle_intersection(bundle_info.id)
|
|
} else {
|
|
current_archetype.edges().get_remove_bundle(bundle_info.id)
|
|
}
|
|
};
|
|
let result = if let Some(result) = remove_bundle_result {
|
|
// this Bundle removal result is cached. just return that!
|
|
result
|
|
} else {
|
|
let mut next_table_components;
|
|
let mut next_sparse_set_components;
|
|
let next_table_id;
|
|
{
|
|
let current_archetype = &mut archetypes[archetype_id];
|
|
let mut removed_table_components = Vec::new();
|
|
let mut removed_sparse_set_components = Vec::new();
|
|
for component_id in bundle_info.component_ids.iter().cloned() {
|
|
if current_archetype.contains(component_id) {
|
|
// SAFE: bundle components were already initialized by bundles.get_info
|
|
let component_info = components.get_info_unchecked(component_id);
|
|
match component_info.storage_type() {
|
|
StorageType::Table => removed_table_components.push(component_id),
|
|
StorageType::SparseSet => removed_sparse_set_components.push(component_id),
|
|
}
|
|
} else if !intersection {
|
|
// a component in the bundle was not present in the entity's archetype, so this
|
|
// removal is invalid cache the result in the archetype
|
|
// graph
|
|
current_archetype
|
|
.edges_mut()
|
|
.insert_remove_bundle(bundle_info.id, None);
|
|
return None;
|
|
}
|
|
}
|
|
|
|
// sort removed components so we can do an efficient "sorted remove". archetype
|
|
// components are already sorted
|
|
removed_table_components.sort();
|
|
removed_sparse_set_components.sort();
|
|
next_table_components = current_archetype.table_components().to_vec();
|
|
next_sparse_set_components = current_archetype.sparse_set_components().to_vec();
|
|
sorted_remove(&mut next_table_components, &removed_table_components);
|
|
sorted_remove(
|
|
&mut next_sparse_set_components,
|
|
&removed_sparse_set_components,
|
|
);
|
|
|
|
next_table_id = if removed_table_components.is_empty() {
|
|
current_archetype.table_id()
|
|
} else {
|
|
// SAFE: all components in next_table_components exist
|
|
storages
|
|
.tables
|
|
.get_id_or_insert(&next_table_components, components)
|
|
};
|
|
}
|
|
|
|
let new_archetype_id = archetypes.get_id_or_insert(
|
|
next_table_id,
|
|
next_table_components,
|
|
next_sparse_set_components,
|
|
);
|
|
Some(new_archetype_id)
|
|
};
|
|
let current_archetype = &mut archetypes[archetype_id];
|
|
// cache the result in an edge
|
|
if intersection {
|
|
current_archetype
|
|
.edges_mut()
|
|
.insert_remove_bundle_intersection(bundle_info.id, result);
|
|
} else {
|
|
current_archetype
|
|
.edges_mut()
|
|
.insert_remove_bundle(bundle_info.id, result);
|
|
}
|
|
result
|
|
}
|
|
|
|
fn sorted_remove<T: Eq + Ord + Copy>(source: &mut Vec<T>, remove: &[T]) {
|
|
let mut remove_index = 0;
|
|
source.retain(|value| {
|
|
while remove_index < remove.len() && *value > remove[remove_index] {
|
|
remove_index += 1;
|
|
}
|
|
|
|
if remove_index < remove.len() {
|
|
*value != remove[remove_index]
|
|
} else {
|
|
true
|
|
}
|
|
})
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
#[test]
|
|
fn sorted_remove() {
|
|
let mut a = vec![1, 2, 3, 4, 5, 6, 7];
|
|
let b = vec![1, 2, 3, 5, 7];
|
|
super::sorted_remove(&mut a, &b);
|
|
|
|
assert_eq!(a, vec![4, 6]);
|
|
|
|
let mut a = vec![1];
|
|
let b = vec![1];
|
|
super::sorted_remove(&mut a, &b);
|
|
|
|
assert_eq!(a, vec![]);
|
|
|
|
let mut a = vec![1];
|
|
let b = vec![2];
|
|
super::sorted_remove(&mut a, &b);
|
|
|
|
assert_eq!(a, vec![1]);
|
|
}
|
|
}
|