mirror of
https://github.com/bevyengine/bevy
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dba7790012
Fixes #3408 #3001 also solves this but I dont see it getting merged any time soon so... # Objective make bevy ecs a lil bit less unsound ## Solution make `EntityMut::get_component_mut` return borrows from self instead of `'w`
1467 lines
54 KiB
Rust
1467 lines
54 KiB
Rust
mod entity_ref;
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mod spawn_batch;
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mod world_cell;
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pub use crate::change_detection::Mut;
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pub use entity_ref::*;
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pub use spawn_batch::*;
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pub use world_cell::*;
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use crate::{
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archetype::{ArchetypeComponentId, ArchetypeComponentInfo, ArchetypeId, Archetypes},
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bundle::{Bundle, BundleInserter, BundleSpawner, Bundles},
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change_detection::Ticks,
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component::{Component, ComponentId, ComponentTicks, Components, StorageType},
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entity::{AllocAtWithoutReplacement, Entities, Entity},
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query::{FilterFetch, QueryState, WorldQuery},
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storage::{Column, SparseSet, Storages},
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system::Resource,
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};
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use std::{
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any::TypeId,
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fmt,
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mem::ManuallyDrop,
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sync::atomic::{AtomicU32, Ordering},
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};
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mod identifier;
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pub use identifier::WorldId;
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/// Stores and exposes operations on [entities](Entity), [components](Component), resources,
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/// and their associated metadata.
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///
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/// Each [Entity] has a set of components. Each component can have up to one instance of each
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/// component type. Entity components can be created, updated, removed, and queried using a given
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/// [World].
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///
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/// For complex access patterns involving [`SystemParam`](crate::system::SystemParam),
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/// consider using [`SystemState`](crate::system::SystemState).
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///
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/// To mutate different parts of the world simultaneously,
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/// use [`World::resource_scope`] or [`SystemState`](crate::system::SystemState).
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///
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/// # Resources
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///
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/// Worlds can also store *resources*, which are unique instances of a given type that don't
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/// belong to a specific Entity. There are also *non send resources*, which can only be
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/// accessed on the main thread.
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///
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/// ## Usage of global resources
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///
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/// 1. Insert the resource into the `World`, using [`World::insert_resource`].
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/// 2. Fetch the resource from a system, using [`Res`](crate::system::Res) or [`ResMut`](crate::system::ResMut).
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///
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/// ```
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/// # let mut world = World::default();
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/// # let mut schedule = Schedule::default();
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/// # schedule.add_stage("update", SystemStage::parallel());
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/// # use bevy_ecs::prelude::*;
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/// #
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/// struct MyResource { value: u32 }
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///
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/// world.insert_resource(MyResource { value: 42 });
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///
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/// fn read_resource_system(resource: Res<MyResource>) {
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/// assert_eq!(resource.value, 42);
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/// }
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///
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/// fn write_resource_system(mut resource: ResMut<MyResource>) {
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/// assert_eq!(resource.value, 42);
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/// resource.value = 0;
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/// assert_eq!(resource.value, 0);
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/// }
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/// #
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/// # schedule.add_system_to_stage("update", read_resource_system.label("first"));
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/// # schedule.add_system_to_stage("update", write_resource_system.after("first"));
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/// # schedule.run_once(&mut world);
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/// ```
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pub struct World {
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id: WorldId,
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pub(crate) entities: Entities,
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pub(crate) components: Components,
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pub(crate) archetypes: Archetypes,
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pub(crate) storages: Storages,
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pub(crate) bundles: Bundles,
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pub(crate) removed_components: SparseSet<ComponentId, Vec<Entity>>,
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/// Access cache used by [WorldCell].
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pub(crate) archetype_component_access: ArchetypeComponentAccess,
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main_thread_validator: MainThreadValidator,
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pub(crate) change_tick: AtomicU32,
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pub(crate) last_change_tick: u32,
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}
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impl Default for World {
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fn default() -> Self {
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Self {
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id: WorldId::new().expect("More `bevy` `World`s have been created than is supported"),
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entities: Default::default(),
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components: Default::default(),
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archetypes: Default::default(),
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storages: Default::default(),
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bundles: Default::default(),
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removed_components: Default::default(),
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archetype_component_access: Default::default(),
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main_thread_validator: Default::default(),
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// Default value is `1`, and `last_change_tick`s default to `0`, such that changes
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// are detected on first system runs and for direct world queries.
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change_tick: AtomicU32::new(1),
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last_change_tick: 0,
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}
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}
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}
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impl World {
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/// Creates a new empty [World]
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/// # Panics
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///
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/// If [`usize::MAX`] [`World`]s have been created.
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/// This guarantee allows System Parameters to safely uniquely identify a [`World`],
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/// since its [`WorldId`] is unique
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#[inline]
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pub fn new() -> World {
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World::default()
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}
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/// Retrieves this [`World`]'s unique ID
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#[inline]
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pub fn id(&self) -> WorldId {
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self.id
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}
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/// Retrieves this world's [Entities] collection
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#[inline]
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pub fn entities(&self) -> &Entities {
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&self.entities
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}
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/// Retrieves this world's [Entities] collection mutably
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///
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/// # Safety
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/// Mutable reference must not be used to put the [`Entities`] data
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/// in an invalid state for this [`World`]
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#[inline]
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pub unsafe fn entities_mut(&mut self) -> &mut Entities {
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&mut self.entities
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}
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/// Retrieves this world's [Archetypes] collection
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#[inline]
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pub fn archetypes(&self) -> &Archetypes {
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&self.archetypes
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}
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/// Retrieves this world's [Components] collection
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#[inline]
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pub fn components(&self) -> &Components {
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&self.components
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}
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/// Retrieves this world's [Storages] collection
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#[inline]
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pub fn storages(&self) -> &Storages {
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&self.storages
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}
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/// Retrieves this world's [Bundles] collection
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#[inline]
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pub fn bundles(&self) -> &Bundles {
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&self.bundles
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}
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/// Retrieves a [`WorldCell`], which safely enables multiple mutable World accesses at the same
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/// time, provided those accesses do not conflict with each other.
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#[inline]
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pub fn cell(&mut self) -> WorldCell<'_> {
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WorldCell::new(self)
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}
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pub fn init_component<T: Component>(&mut self) -> ComponentId {
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self.components.init_component::<T>(&mut self.storages)
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}
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/// Retrieves an [`EntityRef`] that exposes read-only operations for the given `entity`.
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/// This will panic if the `entity` does not exist. Use [`World::get_entity`] if you want
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/// to check for entity existence instead of implicitly panic-ing.
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///
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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///
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/// let position = world.entity(entity).get::<Position>().unwrap();
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/// assert_eq!(position.x, 0.0);
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/// ```
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#[inline]
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pub fn entity(&self, entity: Entity) -> EntityRef {
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// Lazily evaluate panic!() via unwrap_or_else() to avoid allocation unless failure
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self.get_entity(entity)
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.unwrap_or_else(|| panic!("Entity {:?} does not exist", entity))
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}
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/// Retrieves an [`EntityMut`] that exposes read and write operations for the given `entity`.
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/// This will panic if the `entity` does not exist. Use [`World::get_entity_mut`] if you want
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/// to check for entity existence instead of implicitly panic-ing.
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///
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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/// let mut entity_mut = world.entity_mut(entity);
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/// let mut position = entity_mut.get_mut::<Position>().unwrap();
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/// position.x = 1.0;
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/// ```
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#[inline]
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pub fn entity_mut(&mut self, entity: Entity) -> EntityMut {
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// Lazily evaluate panic!() via unwrap_or_else() to avoid allocation unless failure
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self.get_entity_mut(entity)
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.unwrap_or_else(|| panic!("Entity {:?} does not exist", entity))
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}
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/// Returns an [`EntityMut`] for the given `entity` (if it exists) or spawns one if it doesn't exist.
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/// This will return [`None`] if the `entity` exists with a different generation.
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///
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/// # Note
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/// Spawning a specific `entity` value is rarely the right choice. Most apps should favor [`World::spawn`].
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/// This method should generally only be used for sharing entities across apps, and only when they have a
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/// scheme worked out to share an ID space (which doesn't happen by default).
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#[inline]
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pub fn get_or_spawn(&mut self, entity: Entity) -> Option<EntityMut> {
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self.flush();
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match self.entities.alloc_at_without_replacement(entity) {
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AllocAtWithoutReplacement::Exists(location) => {
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// SAFE: `entity` exists and `location` is that entity's location
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Some(unsafe { EntityMut::new(self, entity, location) })
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}
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AllocAtWithoutReplacement::DidNotExist => {
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// SAFE: entity was just allocated
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Some(unsafe { self.spawn_at_internal(entity) })
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}
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AllocAtWithoutReplacement::ExistsWithWrongGeneration => None,
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}
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}
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/// Retrieves an [`EntityRef`] that exposes read-only operations for the given `entity`.
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/// Returns [`None`] if the `entity` does not exist. Use [`World::entity`] if you don't want
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/// to unwrap the [`EntityRef`] yourself.
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///
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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///
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/// let entity_ref = world.get_entity(entity).unwrap();
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/// let position = entity_ref.get::<Position>().unwrap();
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/// assert_eq!(position.x, 0.0);
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/// ```
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#[inline]
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pub fn get_entity(&self, entity: Entity) -> Option<EntityRef> {
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let location = self.entities.get(entity)?;
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Some(EntityRef::new(self, entity, location))
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}
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/// Retrieves an [`EntityMut`] that exposes read and write operations for the given `entity`.
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/// Returns [`None`] if the `entity` does not exist. Use [`World::entity_mut`] if you don't want
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/// to unwrap the [`EntityMut`] yourself.
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///
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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///
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/// let mut entity_mut = world.get_entity_mut(entity).unwrap();
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/// let mut position = entity_mut.get_mut::<Position>().unwrap();
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/// position.x = 1.0;
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/// ```
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#[inline]
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pub fn get_entity_mut(&mut self, entity: Entity) -> Option<EntityMut> {
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let location = self.entities.get(entity)?;
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// SAFE: `entity` exists and `location` is that entity's location
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Some(unsafe { EntityMut::new(self, entity, location) })
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}
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/// Spawns a new [`Entity`] and returns a corresponding [`EntityMut`], which can be used
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/// to add components to the entity or retrieve its id.
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///
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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/// #[derive(Component)]
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/// struct Label(&'static str);
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/// #[derive(Component)]
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/// struct Num(u32);
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 }) // add a single component
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/// .insert_bundle((Num(1), Label("hello"))) // add a bundle of components
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/// .id();
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///
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/// let position = world.entity(entity).get::<Position>().unwrap();
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/// assert_eq!(position.x, 0.0);
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/// ```
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pub fn spawn(&mut self) -> EntityMut {
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self.flush();
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let entity = self.entities.alloc();
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// SAFE: entity was just allocated
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unsafe { self.spawn_at_internal(entity) }
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}
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/// # Safety
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/// must be called on an entity that was just allocated
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unsafe fn spawn_at_internal(&mut self, entity: Entity) -> EntityMut {
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let archetype = self.archetypes.empty_mut();
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// PERF: consider avoiding allocating entities in the empty archetype unless needed
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let table_row = self.storages.tables[archetype.table_id()].allocate(entity);
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// SAFE: no components are allocated by archetype.allocate() because the archetype is
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// empty
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let location = archetype.allocate(entity, table_row);
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// SAFE: entity index was just allocated
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self.entities
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.meta
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.get_unchecked_mut(entity.id() as usize)
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.location = location;
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EntityMut::new(self, entity, location)
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}
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/// Spawns a batch of entities with the same component [Bundle] type. Takes a given [Bundle]
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/// iterator and returns a corresponding [Entity] iterator.
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/// This is more efficient than spawning entities and adding components to them individually,
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/// but it is limited to spawning entities with the same [Bundle] type, whereas spawning
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/// individually is more flexible.
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///
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/// ```
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/// use bevy_ecs::{component::Component, entity::Entity, world::World};
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///
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/// #[derive(Component)]
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/// struct Str(&'static str);
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/// #[derive(Component)]
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/// struct Num(u32);
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///
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/// let mut world = World::new();
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/// let entities = world.spawn_batch(vec![
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/// (Str("a"), Num(0)), // the first entity
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/// (Str("b"), Num(1)), // the second entity
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/// ]).collect::<Vec<Entity>>();
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///
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/// assert_eq!(entities.len(), 2);
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/// ```
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pub fn spawn_batch<I>(&mut self, iter: I) -> SpawnBatchIter<'_, I::IntoIter>
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where
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I: IntoIterator,
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I::Item: Bundle,
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{
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SpawnBatchIter::new(self, iter.into_iter())
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}
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/// Retrieves a reference to the given `entity`'s [Component] of the given type.
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/// Returns [None] if the `entity` does not have a [Component] of the given type.
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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/// let position = world.get::<Position>(entity).unwrap();
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/// assert_eq!(position.x, 0.0);
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/// ```
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#[inline]
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pub fn get<T: Component>(&self, entity: Entity) -> Option<&T> {
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self.get_entity(entity)?.get()
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}
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/// Retrieves a mutable reference to the given `entity`'s [Component] of the given type.
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/// Returns [None] if the `entity` does not have a [Component] of the given type.
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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/// let mut position = world.get_mut::<Position>(entity).unwrap();
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/// position.x = 1.0;
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/// ```
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#[inline]
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pub fn get_mut<T: Component>(&mut self, entity: Entity) -> Option<Mut<T>> {
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// SAFE: lifetimes enforce correct usage of returned borrow
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unsafe { self.get_entity_mut(entity)?.get_unchecked_mut::<T>() }
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}
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/// Despawns the given `entity`, if it exists. This will also remove all of the entity's
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/// [Component]s. Returns `true` if the `entity` is successfully despawned and `false` if
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/// the `entity` does not exist.
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/// ```
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/// use bevy_ecs::{component::Component, world::World};
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///
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/// #[derive(Component)]
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/// struct Position {
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/// x: f32,
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/// y: f32,
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/// }
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///
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/// let mut world = World::new();
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/// let entity = world.spawn()
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/// .insert(Position { x: 0.0, y: 0.0 })
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/// .id();
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/// assert!(world.despawn(entity));
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/// assert!(world.get_entity(entity).is_none());
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/// assert!(world.get::<Position>(entity).is_none());
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/// ```
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#[inline]
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pub fn despawn(&mut self, entity: Entity) -> bool {
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self.get_entity_mut(entity)
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.map(|e| {
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e.despawn();
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true
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})
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.unwrap_or(false)
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}
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/// Clears component tracker state
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pub fn clear_trackers(&mut self) {
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for entities in self.removed_components.values_mut() {
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entities.clear();
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}
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self.last_change_tick = self.increment_change_tick();
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}
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/// Returns [`QueryState`] for the given [`WorldQuery`], which is used to efficiently
|
|
/// run queries on the [`World`] by storing and reusing the [`QueryState`].
|
|
/// ```
|
|
/// use bevy_ecs::{component::Component, entity::Entity, world::World};
|
|
///
|
|
/// #[derive(Component, Debug, PartialEq)]
|
|
/// struct Position {
|
|
/// x: f32,
|
|
/// y: f32,
|
|
/// }
|
|
///
|
|
/// #[derive(Component)]
|
|
/// struct Velocity {
|
|
/// x: f32,
|
|
/// y: f32,
|
|
/// }
|
|
///
|
|
/// let mut world = World::new();
|
|
/// let entities = world.spawn_batch(vec![
|
|
/// (Position { x: 0.0, y: 0.0}, Velocity { x: 1.0, y: 0.0 }),
|
|
/// (Position { x: 0.0, y: 0.0}, Velocity { x: 0.0, y: 1.0 }),
|
|
/// ]).collect::<Vec<Entity>>();
|
|
///
|
|
/// let mut query = world.query::<(&mut Position, &Velocity)>();
|
|
/// for (mut position, velocity) in query.iter_mut(&mut world) {
|
|
/// position.x += velocity.x;
|
|
/// position.y += velocity.y;
|
|
/// }
|
|
///
|
|
/// assert_eq!(world.get::<Position>(entities[0]).unwrap(), &Position { x: 1.0, y: 0.0 });
|
|
/// assert_eq!(world.get::<Position>(entities[1]).unwrap(), &Position { x: 0.0, y: 1.0 });
|
|
/// ```
|
|
///
|
|
/// To iterate over entities in a deterministic order,
|
|
/// sort the results of the query using the desired component as a key.
|
|
/// Note that this requires fetching the whole result set from the query
|
|
/// and allocation of a [Vec] to store it.
|
|
///
|
|
/// ```
|
|
/// use bevy_ecs::{component::Component, entity::Entity, world::World};
|
|
///
|
|
/// #[derive(Component, PartialEq, Eq, PartialOrd, Ord, Debug)]
|
|
/// struct Order(i32);
|
|
/// #[derive(Component, PartialEq, Debug)]
|
|
/// struct Label(&'static str);
|
|
///
|
|
/// let mut world = World::new();
|
|
/// let a = world.spawn().insert_bundle((Order(2), Label("second"))).id();
|
|
/// let b = world.spawn().insert_bundle((Order(3), Label("third"))).id();
|
|
/// let c = world.spawn().insert_bundle((Order(1), Label("first"))).id();
|
|
/// let mut entities = world.query::<(Entity, &Order, &Label)>()
|
|
/// .iter(&world)
|
|
/// .collect::<Vec<_>>();
|
|
/// // Sort the query results by their `Order` component before comparing
|
|
/// // to expected results. Query iteration order should not be relied on.
|
|
/// entities.sort_by_key(|e| e.1);
|
|
/// assert_eq!(entities, vec![
|
|
/// (c, &Order(1), &Label("first")),
|
|
/// (a, &Order(2), &Label("second")),
|
|
/// (b, &Order(3), &Label("third")),
|
|
/// ]);
|
|
/// ```
|
|
#[inline]
|
|
pub fn query<Q: WorldQuery>(&mut self) -> QueryState<Q, ()> {
|
|
QueryState::new(self)
|
|
}
|
|
|
|
/// Returns [`QueryState`] for the given filtered [`WorldQuery`], which is used to efficiently
|
|
/// run queries on the [`World`] by storing and reusing the [`QueryState`].
|
|
/// ```
|
|
/// use bevy_ecs::{component::Component, entity::Entity, world::World, query::With};
|
|
///
|
|
/// #[derive(Component)]
|
|
/// struct A;
|
|
/// #[derive(Component)]
|
|
/// struct B;
|
|
///
|
|
/// let mut world = World::new();
|
|
/// let e1 = world.spawn().insert(A).id();
|
|
/// let e2 = world.spawn().insert_bundle((A, B)).id();
|
|
///
|
|
/// let mut query = world.query_filtered::<Entity, With<B>>();
|
|
/// let matching_entities = query.iter(&world).collect::<Vec<Entity>>();
|
|
///
|
|
/// assert_eq!(matching_entities, vec![e2]);
|
|
/// ```
|
|
#[inline]
|
|
pub fn query_filtered<Q: WorldQuery, F: WorldQuery>(&mut self) -> QueryState<Q, F>
|
|
where
|
|
F::Fetch: FilterFetch,
|
|
{
|
|
QueryState::new(self)
|
|
}
|
|
|
|
/// Returns an iterator of entities that had components of type `T` removed
|
|
/// since the last call to [`World::clear_trackers`].
|
|
pub fn removed<T: Component>(&self) -> std::iter::Cloned<std::slice::Iter<'_, Entity>> {
|
|
if let Some(component_id) = self.components.get_id(TypeId::of::<T>()) {
|
|
self.removed_with_id(component_id)
|
|
} else {
|
|
[].iter().cloned()
|
|
}
|
|
}
|
|
|
|
/// Returns an iterator of entities that had components with the given `component_id` removed
|
|
/// since the last call to [`World::clear_trackers`].
|
|
pub fn removed_with_id(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> std::iter::Cloned<std::slice::Iter<'_, Entity>> {
|
|
if let Some(removed) = self.removed_components.get(component_id) {
|
|
removed.iter().cloned()
|
|
} else {
|
|
[].iter().cloned()
|
|
}
|
|
}
|
|
|
|
/// Inserts a new resource with standard starting values.
|
|
///
|
|
/// If the resource already exists, nothing happens.
|
|
///
|
|
/// The value given by the [`FromWorld::from_world`] method will be used.
|
|
/// Note that any resource with the `Default` trait automatically implements `FromWorld`,
|
|
/// and those default values will be here instead.
|
|
#[inline]
|
|
pub fn init_resource<R: Resource + FromWorld>(&mut self) {
|
|
if !self.contains_resource::<R>() {
|
|
let resource = R::from_world(self);
|
|
self.insert_resource(resource);
|
|
}
|
|
}
|
|
|
|
/// Inserts a new resource with the given `value`.
|
|
///
|
|
/// Resources are "unique" data of a given type.
|
|
/// If you insert a resource of a type that already exists,
|
|
/// you will overwrite any existing data.
|
|
#[inline]
|
|
pub fn insert_resource<R: Resource>(&mut self, value: R) {
|
|
let component_id = self.components.init_resource::<R>();
|
|
// SAFE: component_id just initialized and corresponds to resource of type T
|
|
unsafe { self.insert_resource_with_id(component_id, value) };
|
|
}
|
|
|
|
/// Inserts a new non-send resource with standard starting values.
|
|
///
|
|
/// If the resource already exists, nothing happens.
|
|
///
|
|
/// The value given by the [`FromWorld::from_world`] method will be used.
|
|
/// Note that any resource with the `Default` trait automatically implements `FromWorld`,
|
|
/// and those default values will be here instead.
|
|
#[inline]
|
|
pub fn init_non_send_resource<R: 'static + FromWorld>(&mut self) {
|
|
if !self.contains_resource::<R>() {
|
|
let resource = R::from_world(self);
|
|
self.insert_non_send_resource(resource);
|
|
}
|
|
}
|
|
|
|
/// Inserts a new non-send resource with the given `value`.
|
|
///
|
|
/// `NonSend` resources cannot be sent across threads,
|
|
/// and do not need the `Send + Sync` bounds.
|
|
/// Systems with `NonSend` resources are always scheduled on the main thread.
|
|
#[inline]
|
|
pub fn insert_non_send_resource<R: 'static>(&mut self, value: R) {
|
|
self.validate_non_send_access::<R>();
|
|
let component_id = self.components.init_non_send::<R>();
|
|
// SAFE: component_id just initialized and corresponds to resource of type R
|
|
unsafe { self.insert_resource_with_id(component_id, value) };
|
|
}
|
|
|
|
/// Removes the resource of a given type and returns it, if it exists. Otherwise returns [None].
|
|
#[inline]
|
|
pub fn remove_resource<R: Resource>(&mut self) -> Option<R> {
|
|
// SAFE: R is Send + Sync
|
|
unsafe { self.remove_resource_unchecked() }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn remove_non_send_resource<R: 'static>(&mut self) -> Option<R> {
|
|
self.validate_non_send_access::<R>();
|
|
// SAFE: we are on main thread
|
|
unsafe { self.remove_resource_unchecked() }
|
|
}
|
|
|
|
#[inline]
|
|
/// # Safety
|
|
/// Only remove `NonSend` resources from the main thread
|
|
/// as they cannot be sent across theads
|
|
#[allow(unused_unsafe)]
|
|
pub unsafe fn remove_resource_unchecked<R: 'static>(&mut self) -> Option<R> {
|
|
let component_id = self.components.get_resource_id(TypeId::of::<R>())?;
|
|
let resource_archetype = self.archetypes.resource_mut();
|
|
let unique_components = resource_archetype.unique_components_mut();
|
|
let column = unique_components.get_mut(component_id)?;
|
|
if column.is_empty() {
|
|
return None;
|
|
}
|
|
// SAFE: if a resource column exists, row 0 exists as well. caller takes ownership of the
|
|
// ptr value / drop is called when R is dropped
|
|
let (ptr, _) = unsafe { column.swap_remove_and_forget_unchecked(0) };
|
|
// SAFE: column is of type R
|
|
Some(unsafe { ptr.cast::<R>().read() })
|
|
}
|
|
|
|
/// Returns `true` if a resource of type `R` exists. Otherwise returns `false`.
|
|
#[inline]
|
|
pub fn contains_resource<R: 'static>(&self) -> bool {
|
|
let component_id =
|
|
if let Some(component_id) = self.components.get_resource_id(TypeId::of::<R>()) {
|
|
component_id
|
|
} else {
|
|
return false;
|
|
};
|
|
self.get_populated_resource_column(component_id).is_some()
|
|
}
|
|
|
|
pub fn is_resource_added<R: Resource>(&self) -> bool {
|
|
let component_id =
|
|
if let Some(component_id) = self.components.get_resource_id(TypeId::of::<R>()) {
|
|
component_id
|
|
} else {
|
|
return false;
|
|
};
|
|
let column = if let Some(column) = self.get_populated_resource_column(component_id) {
|
|
column
|
|
} else {
|
|
return false;
|
|
};
|
|
// SAFE: resources table always have row 0
|
|
let ticks = unsafe { column.get_ticks_unchecked(0) };
|
|
ticks.is_added(self.last_change_tick(), self.read_change_tick())
|
|
}
|
|
|
|
pub fn is_resource_changed<R: Resource>(&self) -> bool {
|
|
let component_id =
|
|
if let Some(component_id) = self.components.get_resource_id(TypeId::of::<R>()) {
|
|
component_id
|
|
} else {
|
|
return false;
|
|
};
|
|
let column = if let Some(column) = self.get_populated_resource_column(component_id) {
|
|
column
|
|
} else {
|
|
return false;
|
|
};
|
|
// SAFE: resources table always have row 0
|
|
let ticks = unsafe { column.get_ticks_unchecked(0) };
|
|
ticks.is_changed(self.last_change_tick(), self.read_change_tick())
|
|
}
|
|
|
|
/// Gets a reference to the resource of the given type
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if the resource does not exist.
|
|
/// Use [`get_resource`](World::get_resource) instead if you want to handle this case.
|
|
///
|
|
/// If you want to instead insert a value if the resource does not exist,
|
|
/// use [`get_resource_or_insert_with`](World::get_resource_or_insert_with).
|
|
#[inline]
|
|
#[track_caller]
|
|
pub fn resource<R: Resource>(&self) -> &R {
|
|
match self.get_resource() {
|
|
Some(x) => x,
|
|
None => panic!(
|
|
"Requested resource {} does not exist in the `World`.
|
|
Did you forget to add it using `app.add_resource` / `app.init_resource`?
|
|
Resources are also implicitly added via `app.add_event`,
|
|
and can be added by plugins.",
|
|
std::any::type_name::<R>()
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Gets a mutable reference to the resource of the given type
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if the resource does not exist.
|
|
/// Use [`get_resource_mut`](World::get_resource_mut) instead if you want to handle this case.
|
|
///
|
|
/// If you want to instead insert a value if the resource does not exist,
|
|
/// use [`get_resource_or_insert_with`](World::get_resource_or_insert_with).
|
|
#[inline]
|
|
#[track_caller]
|
|
pub fn resource_mut<R: Resource>(&mut self) -> Mut<'_, R> {
|
|
match self.get_resource_mut() {
|
|
Some(x) => x,
|
|
None => panic!(
|
|
"Requested resource {} does not exist in the `World`.
|
|
Did you forget to add it using `app.add_resource` / `app.init_resource`?
|
|
Resources are also implicitly added via `app.add_event`,
|
|
and can be added by plugins.",
|
|
std::any::type_name::<R>()
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Gets a reference to the resource of the given type if it exists
|
|
#[inline]
|
|
pub fn get_resource<R: Resource>(&self) -> Option<&R> {
|
|
let component_id = self.components.get_resource_id(TypeId::of::<R>())?;
|
|
// SAFE: unique world access
|
|
unsafe { self.get_resource_with_id(component_id) }
|
|
}
|
|
|
|
/// Gets a mutable reference to the resource of the given type if it exists
|
|
#[inline]
|
|
pub fn get_resource_mut<R: Resource>(&mut self) -> Option<Mut<'_, R>> {
|
|
// SAFE: unique world access
|
|
unsafe { self.get_resource_unchecked_mut() }
|
|
}
|
|
|
|
// PERF: optimize this to avoid redundant lookups
|
|
/// Gets a mutable reference to the resource of type `T` if it exists,
|
|
/// otherwise inserts the resource using the result of calling `func`.
|
|
#[inline]
|
|
pub fn get_resource_or_insert_with<R: Resource>(
|
|
&mut self,
|
|
func: impl FnOnce() -> R,
|
|
) -> Mut<'_, R> {
|
|
if !self.contains_resource::<R>() {
|
|
self.insert_resource(func());
|
|
}
|
|
self.resource_mut()
|
|
}
|
|
|
|
/// Gets a mutable reference to the resource of the given type, if it exists
|
|
/// Otherwise returns [None]
|
|
///
|
|
/// # Safety
|
|
/// This will allow aliased mutable access to the given resource type. The caller must ensure
|
|
/// that only one mutable access exists at a time.
|
|
#[inline]
|
|
pub unsafe fn get_resource_unchecked_mut<R: Resource>(&self) -> Option<Mut<'_, R>> {
|
|
let component_id = self.components.get_resource_id(TypeId::of::<R>())?;
|
|
self.get_resource_unchecked_mut_with_id(component_id)
|
|
}
|
|
|
|
/// Gets an immutable reference to the non-send resource of the given type, if it exists.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if the resource does not exist.
|
|
/// Use [`get_non_send_resource`](World::get_non_send_resource) instead if you want to handle this case.
|
|
#[inline]
|
|
#[track_caller]
|
|
pub fn non_send_resource<R: 'static>(&self) -> &R {
|
|
match self.get_non_send_resource() {
|
|
Some(x) => x,
|
|
None => panic!(
|
|
"Requested non-send resource {} does not exist in the `World`.
|
|
Did you forget to add it using `app.add_non_send_resource` / `app.init_non_send_resource`?
|
|
Non-send resources can also be be added by plugins.",
|
|
std::any::type_name::<R>()
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Gets a mutable reference to the non-send resource of the given type, if it exists.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if the resource does not exist.
|
|
/// Use [`get_non_send_resource_mut`](World::get_non_send_resource_mut) instead if you want to handle this case.
|
|
#[inline]
|
|
#[track_caller]
|
|
pub fn non_send_resource_mut<R: 'static>(&mut self) -> Mut<'_, R> {
|
|
match self.get_non_send_resource_mut() {
|
|
Some(x) => x,
|
|
None => panic!(
|
|
"Requested non-send resource {} does not exist in the `World`.
|
|
Did you forget to add it using `app.add_non_send_resource` / `app.init_non_send_resource`?
|
|
Non-send resources can also be be added by plugins.",
|
|
std::any::type_name::<R>()
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Gets a reference to the non-send resource of the given type, if it exists.
|
|
/// Otherwise returns [None]
|
|
#[inline]
|
|
pub fn get_non_send_resource<R: 'static>(&self) -> Option<&R> {
|
|
let component_id = self.components.get_resource_id(TypeId::of::<R>())?;
|
|
// SAFE: component id matches type T
|
|
unsafe { self.get_non_send_with_id(component_id) }
|
|
}
|
|
|
|
/// Gets a mutable reference to the non-send resource of the given type, if it exists.
|
|
/// Otherwise returns [None]
|
|
#[inline]
|
|
pub fn get_non_send_resource_mut<R: 'static>(&mut self) -> Option<Mut<'_, R>> {
|
|
// SAFE: unique world access
|
|
unsafe { self.get_non_send_resource_unchecked_mut() }
|
|
}
|
|
|
|
/// Gets a mutable reference to the non-send resource of the given type, if it exists.
|
|
/// Otherwise returns [None]
|
|
///
|
|
/// # Safety
|
|
/// This will allow aliased mutable access to the given non-send resource type. The caller must
|
|
/// ensure that only one mutable access exists at a time.
|
|
#[inline]
|
|
pub unsafe fn get_non_send_resource_unchecked_mut<R: 'static>(&self) -> Option<Mut<'_, R>> {
|
|
let component_id = self.components.get_resource_id(TypeId::of::<R>())?;
|
|
self.get_non_send_unchecked_mut_with_id(component_id)
|
|
}
|
|
|
|
/// For a given batch of ([Entity], [Bundle]) pairs, either spawns each [Entity] with the given
|
|
/// bundle (if the entity does not exist), or inserts the [Bundle] (if the entity already exists).
|
|
/// This is faster than doing equivalent operations one-by-one.
|
|
/// Returns [Ok] if all entities were successfully inserted into or spawned. Otherwise it returns an [Err]
|
|
/// with a list of entities that could not be spawned or inserted into. A "spawn or insert" operation can
|
|
/// only fail if an [Entity] is passed in with an "invalid generation" that conflicts with an existing [Entity].
|
|
///
|
|
/// # Note
|
|
/// Spawning a specific `entity` value is rarely the right choice. Most apps should use [`World::spawn_batch`].
|
|
/// This method should generally only be used for sharing entities across apps, and only when they have a scheme
|
|
/// worked out to share an ID space (which doesn't happen by default).
|
|
///
|
|
/// ```
|
|
/// use bevy_ecs::{entity::Entity, world::World, component::Component};
|
|
/// #[derive(Component)]
|
|
/// struct A(&'static str);
|
|
/// #[derive(Component, PartialEq, Debug)]
|
|
/// struct B(f32);
|
|
///
|
|
/// let mut world = World::new();
|
|
/// let e0 = world.spawn().id();
|
|
/// let e1 = world.spawn().id();
|
|
/// world.insert_or_spawn_batch(vec![
|
|
/// (e0, (A("a"), B(0.0))), // the first entity
|
|
/// (e1, (A("b"), B(1.0))), // the second entity
|
|
/// ]);
|
|
///
|
|
/// assert_eq!(world.get::<B>(e0), Some(&B(0.0)));
|
|
/// ```
|
|
pub fn insert_or_spawn_batch<I, B>(&mut self, iter: I) -> Result<(), Vec<Entity>>
|
|
where
|
|
I: IntoIterator,
|
|
I::IntoIter: Iterator<Item = (Entity, B)>,
|
|
B: Bundle,
|
|
{
|
|
self.flush();
|
|
|
|
let iter = iter.into_iter();
|
|
let change_tick = *self.change_tick.get_mut();
|
|
|
|
let bundle_info = self
|
|
.bundles
|
|
.init_info::<B>(&mut self.components, &mut self.storages);
|
|
enum SpawnOrInsert<'a, 'b> {
|
|
Spawn(BundleSpawner<'a, 'b>),
|
|
Insert(BundleInserter<'a, 'b>, ArchetypeId),
|
|
}
|
|
|
|
impl<'a, 'b> SpawnOrInsert<'a, 'b> {
|
|
fn entities(&mut self) -> &mut Entities {
|
|
match self {
|
|
SpawnOrInsert::Spawn(spawner) => spawner.entities,
|
|
SpawnOrInsert::Insert(inserter, _) => inserter.entities,
|
|
}
|
|
}
|
|
}
|
|
let mut spawn_or_insert = SpawnOrInsert::Spawn(bundle_info.get_bundle_spawner(
|
|
&mut self.entities,
|
|
&mut self.archetypes,
|
|
&mut self.components,
|
|
&mut self.storages,
|
|
change_tick,
|
|
));
|
|
|
|
let mut invalid_entities = Vec::new();
|
|
for (entity, bundle) in iter {
|
|
match spawn_or_insert
|
|
.entities()
|
|
.alloc_at_without_replacement(entity)
|
|
{
|
|
AllocAtWithoutReplacement::Exists(location) => {
|
|
match spawn_or_insert {
|
|
SpawnOrInsert::Insert(ref mut inserter, archetype)
|
|
if location.archetype_id == archetype =>
|
|
{
|
|
// SAFE: `entity` is valid, `location` matches entity, bundle matches inserter
|
|
unsafe { inserter.insert(entity, location.index, bundle) };
|
|
}
|
|
_ => {
|
|
let mut inserter = bundle_info.get_bundle_inserter(
|
|
&mut self.entities,
|
|
&mut self.archetypes,
|
|
&mut self.components,
|
|
&mut self.storages,
|
|
location.archetype_id,
|
|
change_tick,
|
|
);
|
|
// SAFE: `entity` is valid, `location` matches entity, bundle matches inserter
|
|
unsafe { inserter.insert(entity, location.index, bundle) };
|
|
spawn_or_insert =
|
|
SpawnOrInsert::Insert(inserter, location.archetype_id);
|
|
}
|
|
};
|
|
}
|
|
AllocAtWithoutReplacement::DidNotExist => {
|
|
if let SpawnOrInsert::Spawn(ref mut spawner) = spawn_or_insert {
|
|
// SAFE: `entity` is allocated (but non existent), bundle matches inserter
|
|
unsafe { spawner.spawn_non_existent(entity, bundle) };
|
|
} else {
|
|
let mut spawner = bundle_info.get_bundle_spawner(
|
|
&mut self.entities,
|
|
&mut self.archetypes,
|
|
&mut self.components,
|
|
&mut self.storages,
|
|
change_tick,
|
|
);
|
|
// SAFE: `entity` is valid, `location` matches entity, bundle matches inserter
|
|
unsafe { spawner.spawn_non_existent(entity, bundle) };
|
|
spawn_or_insert = SpawnOrInsert::Spawn(spawner);
|
|
}
|
|
}
|
|
AllocAtWithoutReplacement::ExistsWithWrongGeneration => {
|
|
invalid_entities.push(entity);
|
|
}
|
|
}
|
|
}
|
|
|
|
if invalid_entities.is_empty() {
|
|
Ok(())
|
|
} else {
|
|
Err(invalid_entities)
|
|
}
|
|
}
|
|
|
|
/// Temporarily removes the requested resource from this [`World`], then re-adds it before returning.
|
|
///
|
|
/// This enables safe simultaneous mutable access to both a resource and the rest of the [`World`].
|
|
/// For more complex access patterns, consider using [`SystemState`](crate::system::SystemState).
|
|
///
|
|
/// # Example
|
|
/// ```
|
|
/// use bevy_ecs::{component::Component, world::{World, Mut}};
|
|
/// #[derive(Component)]
|
|
/// struct A(u32);
|
|
/// #[derive(Component)]
|
|
/// struct B(u32);
|
|
/// let mut world = World::new();
|
|
/// world.insert_resource(A(1));
|
|
/// let entity = world.spawn().insert(B(1)).id();
|
|
///
|
|
/// world.resource_scope(|world, mut a: Mut<A>| {
|
|
/// let b = world.get_mut::<B>(entity).unwrap();
|
|
/// a.0 += b.0;
|
|
/// });
|
|
/// assert_eq!(world.get_resource::<A>().unwrap().0, 2);
|
|
/// ```
|
|
pub fn resource_scope<R: Resource, U>(&mut self, f: impl FnOnce(&mut World, Mut<R>) -> U) -> U {
|
|
let component_id = self
|
|
.components
|
|
.get_resource_id(TypeId::of::<R>())
|
|
.unwrap_or_else(|| panic!("resource does not exist: {}", std::any::type_name::<R>()));
|
|
let (ptr, mut ticks) = {
|
|
let resource_archetype = self.archetypes.resource_mut();
|
|
let unique_components = resource_archetype.unique_components_mut();
|
|
let column = unique_components.get_mut(component_id).unwrap_or_else(|| {
|
|
panic!("resource does not exist: {}", std::any::type_name::<R>())
|
|
});
|
|
assert!(
|
|
!column.is_empty(),
|
|
"resource does not exist: {}",
|
|
std::any::type_name::<R>()
|
|
);
|
|
// SAFE: if a resource column exists, row 0 exists as well. caller takes ownership of
|
|
// the ptr value / drop is called when R is dropped
|
|
unsafe { column.swap_remove_and_forget_unchecked(0) }
|
|
};
|
|
// SAFE: pointer is of type T and valid to move out of
|
|
// Read the value onto the stack to avoid potential mut aliasing.
|
|
let mut value = unsafe { std::ptr::read(ptr.cast::<R>()) };
|
|
let value_mut = Mut {
|
|
value: &mut value,
|
|
ticks: Ticks {
|
|
component_ticks: &mut ticks,
|
|
last_change_tick: self.last_change_tick(),
|
|
change_tick: self.change_tick(),
|
|
},
|
|
};
|
|
let result = f(self, value_mut);
|
|
assert!(!self.contains_resource::<R>());
|
|
let resource_archetype = self.archetypes.resource_mut();
|
|
let unique_components = resource_archetype.unique_components_mut();
|
|
let column = unique_components
|
|
.get_mut(component_id)
|
|
.unwrap_or_else(|| panic!("resource does not exist: {}", std::any::type_name::<R>()));
|
|
|
|
// Wrap the value in MaybeUninit to prepare for passing the value back into the ECS
|
|
let mut nodrop_wrapped_value = std::mem::MaybeUninit::new(value);
|
|
unsafe {
|
|
// SAFE: pointer is of type T, and valid to move out of
|
|
column.push(nodrop_wrapped_value.as_mut_ptr() as *mut _, ticks);
|
|
}
|
|
result
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be assigned to a component of type `R`
|
|
#[inline]
|
|
pub(crate) unsafe fn get_resource_with_id<R: 'static>(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> Option<&R> {
|
|
let column = self.get_populated_resource_column(component_id)?;
|
|
Some(&*column.get_data_ptr().as_ptr().cast::<R>())
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be assigned to a component of type `R`
|
|
/// Caller must ensure this doesn't violate Rust mutability rules for the given resource.
|
|
#[inline]
|
|
pub(crate) unsafe fn get_resource_unchecked_mut_with_id<R>(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> Option<Mut<'_, R>> {
|
|
let column = self.get_populated_resource_column(component_id)?;
|
|
Some(Mut {
|
|
value: &mut *column.get_data_ptr().cast::<R>().as_ptr(),
|
|
ticks: Ticks {
|
|
component_ticks: &mut *column.get_ticks_mut_ptr_unchecked(0),
|
|
last_change_tick: self.last_change_tick(),
|
|
change_tick: self.read_change_tick(),
|
|
},
|
|
})
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be assigned to a component of type `R`
|
|
#[inline]
|
|
pub(crate) unsafe fn get_non_send_with_id<R: 'static>(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> Option<&R> {
|
|
self.validate_non_send_access::<R>();
|
|
self.get_resource_with_id(component_id)
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be assigned to a component of type `R`.
|
|
/// Caller must ensure this doesn't violate Rust mutability rules for the given resource.
|
|
#[inline]
|
|
pub(crate) unsafe fn get_non_send_unchecked_mut_with_id<R: 'static>(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> Option<Mut<'_, R>> {
|
|
self.validate_non_send_access::<R>();
|
|
self.get_resource_unchecked_mut_with_id(component_id)
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be valid and correspond to a resource component of type `R`
|
|
#[inline]
|
|
unsafe fn insert_resource_with_id<R>(&mut self, component_id: ComponentId, value: R) {
|
|
let change_tick = self.change_tick();
|
|
let column = self.initialize_resource_internal(component_id);
|
|
if column.is_empty() {
|
|
let mut value = ManuallyDrop::new(value);
|
|
// SAFE: column is of type R and has been allocated above
|
|
let data = (&mut *value as *mut R).cast::<u8>();
|
|
column.push(data, ComponentTicks::new(change_tick));
|
|
} else {
|
|
// SAFE: column is of type R and has already been allocated
|
|
*column.get_data_unchecked(0).cast::<R>() = value;
|
|
column.get_ticks_unchecked_mut(0).set_changed(change_tick);
|
|
}
|
|
}
|
|
|
|
/// # Safety
|
|
/// `component_id` must be valid and correspond to a resource component of type `R`
|
|
#[inline]
|
|
unsafe fn initialize_resource_internal(&mut self, component_id: ComponentId) -> &mut Column {
|
|
// SAFE: resource archetype always exists
|
|
let resource_archetype = self
|
|
.archetypes
|
|
.archetypes
|
|
.get_unchecked_mut(ArchetypeId::RESOURCE.index());
|
|
let resource_archetype_components = &mut resource_archetype.components;
|
|
let archetype_component_count = &mut self.archetypes.archetype_component_count;
|
|
let components = &self.components;
|
|
resource_archetype
|
|
.unique_components
|
|
.get_or_insert_with(component_id, || {
|
|
resource_archetype_components.insert(
|
|
component_id,
|
|
ArchetypeComponentInfo {
|
|
archetype_component_id: ArchetypeComponentId::new(
|
|
*archetype_component_count,
|
|
),
|
|
storage_type: StorageType::Table,
|
|
},
|
|
);
|
|
*archetype_component_count += 1;
|
|
let component_info = components.get_info_unchecked(component_id);
|
|
Column::with_capacity(component_info, 1)
|
|
})
|
|
}
|
|
|
|
pub(crate) fn initialize_resource<R: Resource>(&mut self) -> ComponentId {
|
|
let component_id = self.components.init_resource::<R>();
|
|
// SAFE: resource initialized above
|
|
unsafe { self.initialize_resource_internal(component_id) };
|
|
component_id
|
|
}
|
|
|
|
pub(crate) fn initialize_non_send_resource<R: 'static>(&mut self) -> ComponentId {
|
|
let component_id = self.components.init_non_send::<R>();
|
|
// SAFE: resource initialized above
|
|
unsafe { self.initialize_resource_internal(component_id) };
|
|
component_id
|
|
}
|
|
|
|
/// returns the resource column if the requested resource exists
|
|
pub(crate) fn get_populated_resource_column(
|
|
&self,
|
|
component_id: ComponentId,
|
|
) -> Option<&Column> {
|
|
let resource_archetype = self.archetypes.resource();
|
|
let unique_components = resource_archetype.unique_components();
|
|
unique_components.get(component_id).and_then(|column| {
|
|
if column.is_empty() {
|
|
None
|
|
} else {
|
|
Some(column)
|
|
}
|
|
})
|
|
}
|
|
|
|
pub(crate) fn validate_non_send_access<T: 'static>(&self) {
|
|
assert!(
|
|
self.main_thread_validator.is_main_thread(),
|
|
"attempted to access NonSend resource {} off of the main thread",
|
|
std::any::type_name::<T>(),
|
|
);
|
|
}
|
|
|
|
/// Empties queued entities and adds them to the empty [Archetype](crate::archetype::Archetype).
|
|
/// This should be called before doing operations that might operate on queued entities,
|
|
/// such as inserting a [Component].
|
|
pub(crate) fn flush(&mut self) {
|
|
let empty_archetype = self.archetypes.empty_mut();
|
|
unsafe {
|
|
let table = &mut self.storages.tables[empty_archetype.table_id()];
|
|
// PERF: consider pre-allocating space for flushed entities
|
|
// SAFE: entity is set to a valid location
|
|
self.entities.flush(|entity, location| {
|
|
// SAFE: no components are allocated by archetype.allocate() because the archetype
|
|
// is empty
|
|
*location = empty_archetype.allocate(entity, table.allocate(entity));
|
|
});
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn increment_change_tick(&self) -> u32 {
|
|
self.change_tick.fetch_add(1, Ordering::AcqRel)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn read_change_tick(&self) -> u32 {
|
|
self.change_tick.load(Ordering::Acquire)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn change_tick(&mut self) -> u32 {
|
|
*self.change_tick.get_mut()
|
|
}
|
|
|
|
#[inline]
|
|
pub fn last_change_tick(&self) -> u32 {
|
|
self.last_change_tick
|
|
}
|
|
|
|
pub fn check_change_ticks(&mut self) {
|
|
// Iterate over all component change ticks, clamping their age to max age
|
|
// PERF: parallelize
|
|
let change_tick = self.change_tick();
|
|
self.storages.tables.check_change_ticks(change_tick);
|
|
self.storages.sparse_sets.check_change_ticks(change_tick);
|
|
let resource_archetype = self.archetypes.resource_mut();
|
|
for column in resource_archetype.unique_components.values_mut() {
|
|
column.check_change_ticks(change_tick);
|
|
}
|
|
}
|
|
|
|
pub fn clear_entities(&mut self) {
|
|
self.storages.tables.clear();
|
|
self.storages.sparse_sets.clear();
|
|
self.archetypes.clear_entities();
|
|
self.entities.clear();
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for World {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
f.debug_struct("World")
|
|
.field("id", &self.id)
|
|
.field("entity_count", &self.entities.len())
|
|
.field("archetype_count", &self.archetypes.len())
|
|
.field("component_count", &self.components.len())
|
|
.field(
|
|
"resource_count",
|
|
&self.archetypes.resource().unique_components.len(),
|
|
)
|
|
.finish()
|
|
}
|
|
}
|
|
|
|
// TODO: remove allow on lint - https://github.com/bevyengine/bevy/issues/3666
|
|
#[allow(clippy::non_send_fields_in_send_ty)]
|
|
unsafe impl Send for World {}
|
|
unsafe impl Sync for World {}
|
|
|
|
/// Creates an instance of the type this trait is implemented for
|
|
/// using data from the supplied [World].
|
|
///
|
|
/// This can be helpful for complex initialization or context-aware defaults.
|
|
pub trait FromWorld {
|
|
/// Creates `Self` using data from the given [World]
|
|
fn from_world(world: &mut World) -> Self;
|
|
}
|
|
|
|
impl<T: Default> FromWorld for T {
|
|
fn from_world(_world: &mut World) -> Self {
|
|
T::default()
|
|
}
|
|
}
|
|
|
|
struct MainThreadValidator {
|
|
main_thread: std::thread::ThreadId,
|
|
}
|
|
|
|
impl MainThreadValidator {
|
|
fn is_main_thread(&self) -> bool {
|
|
self.main_thread == std::thread::current().id()
|
|
}
|
|
}
|
|
|
|
impl Default for MainThreadValidator {
|
|
fn default() -> Self {
|
|
Self {
|
|
main_thread: std::thread::current().id(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::World;
|
|
use bevy_ecs_macros::Component;
|
|
use std::{
|
|
panic,
|
|
sync::{
|
|
atomic::{AtomicBool, Ordering},
|
|
Arc, Mutex,
|
|
},
|
|
};
|
|
|
|
// For bevy_ecs_macros
|
|
use crate as bevy_ecs;
|
|
|
|
type ID = u8;
|
|
|
|
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
|
enum DropLogItem {
|
|
Create(ID),
|
|
Drop(ID),
|
|
}
|
|
|
|
#[derive(Component)]
|
|
struct MayPanicInDrop {
|
|
drop_log: Arc<Mutex<Vec<DropLogItem>>>,
|
|
expected_panic_flag: Arc<AtomicBool>,
|
|
should_panic: bool,
|
|
id: u8,
|
|
}
|
|
|
|
impl MayPanicInDrop {
|
|
fn new(
|
|
drop_log: &Arc<Mutex<Vec<DropLogItem>>>,
|
|
expected_panic_flag: &Arc<AtomicBool>,
|
|
should_panic: bool,
|
|
id: u8,
|
|
) -> Self {
|
|
println!("creating component with id {}", id);
|
|
drop_log.lock().unwrap().push(DropLogItem::Create(id));
|
|
|
|
Self {
|
|
drop_log: Arc::clone(drop_log),
|
|
expected_panic_flag: Arc::clone(expected_panic_flag),
|
|
should_panic,
|
|
id,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Drop for MayPanicInDrop {
|
|
fn drop(&mut self) {
|
|
println!("dropping component with id {}", self.id);
|
|
|
|
{
|
|
let mut drop_log = self.drop_log.lock().unwrap();
|
|
drop_log.push(DropLogItem::Drop(self.id));
|
|
// Don't keep the mutex while panicking, or we'll poison it.
|
|
drop(drop_log);
|
|
}
|
|
|
|
if self.should_panic {
|
|
self.expected_panic_flag.store(true, Ordering::SeqCst);
|
|
panic!("testing what happens on panic inside drop");
|
|
}
|
|
}
|
|
}
|
|
|
|
struct DropTestHelper {
|
|
drop_log: Arc<Mutex<Vec<DropLogItem>>>,
|
|
/// Set to `true` right before we intentionally panic, so that if we get
|
|
/// a panic, we know if it was intended or not.
|
|
expected_panic_flag: Arc<AtomicBool>,
|
|
}
|
|
|
|
impl DropTestHelper {
|
|
pub fn new() -> Self {
|
|
Self {
|
|
drop_log: Arc::new(Mutex::new(Vec::<DropLogItem>::new())),
|
|
expected_panic_flag: Arc::new(AtomicBool::new(false)),
|
|
}
|
|
}
|
|
|
|
pub fn make_component(&self, should_panic: bool, id: ID) -> MayPanicInDrop {
|
|
MayPanicInDrop::new(&self.drop_log, &self.expected_panic_flag, should_panic, id)
|
|
}
|
|
|
|
pub fn finish(self, panic_res: std::thread::Result<()>) -> Vec<DropLogItem> {
|
|
let drop_log = Arc::try_unwrap(self.drop_log)
|
|
.unwrap()
|
|
.into_inner()
|
|
.unwrap();
|
|
let expected_panic_flag = self.expected_panic_flag.load(Ordering::SeqCst);
|
|
|
|
if !expected_panic_flag {
|
|
match panic_res {
|
|
Ok(()) => panic!("Expected a panic but it didn't happen"),
|
|
Err(e) => panic::resume_unwind(e),
|
|
}
|
|
}
|
|
|
|
drop_log
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn panic_while_overwriting_component() {
|
|
let helper = DropTestHelper::new();
|
|
|
|
let res = panic::catch_unwind(|| {
|
|
let mut world = World::new();
|
|
world
|
|
.spawn()
|
|
.insert(helper.make_component(true, 0))
|
|
.insert(helper.make_component(false, 1));
|
|
|
|
println!("Done inserting! Dropping world...");
|
|
});
|
|
|
|
let drop_log = helper.finish(res);
|
|
|
|
assert_eq!(
|
|
&*drop_log,
|
|
[
|
|
DropLogItem::Create(0),
|
|
DropLogItem::Create(1),
|
|
DropLogItem::Drop(0),
|
|
DropLogItem::Drop(1)
|
|
]
|
|
);
|
|
}
|
|
}
|