mirror of
https://github.com/bevyengine/bevy
synced 2024-12-21 10:33:08 +00:00
1241 lines
48 KiB
Rust
1241 lines
48 KiB
Rust
//! Types for handling [`Bundle`]s.
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//!
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//! This module contains the [`Bundle`] trait and some other helper types.
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pub use bevy_ecs_macros::Bundle;
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use bevy_utils::{HashMap, HashSet, TypeIdMap};
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use crate::{
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archetype::{
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AddBundle, Archetype, ArchetypeId, Archetypes, BundleComponentStatus, ComponentStatus,
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SpawnBundleStatus,
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},
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component::{Component, ComponentId, ComponentStorage, Components, StorageType, Tick},
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entity::{Entities, Entity, EntityLocation},
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prelude::World,
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query::DebugCheckedUnwrap,
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storage::{SparseSetIndex, SparseSets, Storages, Table, TableRow},
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world::{unsafe_world_cell::UnsafeWorldCell, DeferredWorld},
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};
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use bevy_ptr::OwningPtr;
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use bevy_utils::all_tuples;
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use std::any::TypeId;
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/// The `Bundle` trait enables insertion and removal of [`Component`]s from an entity.
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///
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/// Implementors of the `Bundle` trait are called 'bundles'.
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///
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/// Each bundle represents a static set of [`Component`] types.
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/// Currently, bundles can only contain one of each [`Component`], and will
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/// panic once initialised if this is not met.
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///
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/// ## Insertion
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///
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/// The primary use for bundles is to add a useful collection of components to an entity.
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///
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/// Adding a value of bundle to an entity will add the components from the set it
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/// represents to the entity.
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/// The values of these components are taken from the bundle.
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/// If an entity already had one of these components, the entity's original component value
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/// will be overwritten.
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///
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/// Importantly, bundles are only their constituent set of components.
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/// You **should not** use bundles as a unit of behavior.
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/// The behavior of your app can only be considered in terms of components, as systems,
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/// which drive the behavior of a `bevy` application, operate on combinations of
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/// components.
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///
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/// This rule is also important because multiple bundles may contain the same component type,
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/// calculated in different ways — adding both of these bundles to one entity
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/// would create incoherent behavior.
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/// This would be unexpected if bundles were treated as an abstraction boundary, as
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/// the abstraction would be unmaintainable for these cases.
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/// For example, both `Camera3dBundle` and `Camera2dBundle` contain the `CameraRenderGraph`
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/// component, but specifying different render graphs to use.
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/// If the bundles were both added to the same entity, only one of these two bundles would work.
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///
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/// For this reason, there is intentionally no [`Query`] to match whether an entity
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/// contains the components of a bundle.
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/// Queries should instead only select the components they logically operate on.
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///
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/// ## Removal
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///
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/// Bundles are also used when removing components from an entity.
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///
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/// Removing a bundle from an entity will remove any of its components attached
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/// to the entity from the entity.
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/// That is, if the entity does not have all the components of the bundle, those
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/// which are present will be removed.
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///
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/// # Implementors
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///
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/// Every type which implements [`Component`] also implements `Bundle`, since
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/// [`Component`] types can be added to or removed from an entity.
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///
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/// Additionally, [Tuples](`tuple`) of bundles are also [`Bundle`] (with up to 15 bundles).
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/// These bundles contain the items of the 'inner' bundles.
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/// This is a convenient shorthand which is primarily used when spawning entities.
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/// For example, spawning an entity using the bundle `(SpriteBundle {...}, PlayerMarker)`
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/// will spawn an entity with components required for a 2d sprite, and the `PlayerMarker` component.
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///
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/// [`unit`], otherwise known as [`()`](`unit`), is a [`Bundle`] containing no components (since it
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/// can also be considered as the empty tuple).
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/// This can be useful for spawning large numbers of empty entities using
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/// [`World::spawn_batch`](crate::world::World::spawn_batch).
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///
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/// Tuple bundles can be nested, which can be used to create an anonymous bundle with more than
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/// 15 items.
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/// However, in most cases where this is required, the derive macro [`derive@Bundle`] should be
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/// used instead.
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/// The derived `Bundle` implementation contains the items of its fields, which all must
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/// implement `Bundle`.
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/// As explained above, this includes any [`Component`] type, and other derived bundles.
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///
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/// If you want to add `PhantomData` to your `Bundle` you have to mark it with `#[bundle(ignore)]`.
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/// ```
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/// # use std::marker::PhantomData;
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/// use bevy_ecs::{component::Component, bundle::Bundle};
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///
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/// #[derive(Component)]
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/// struct XPosition(i32);
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/// #[derive(Component)]
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/// struct YPosition(i32);
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///
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/// #[derive(Bundle)]
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/// struct PositionBundle {
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/// // A bundle can contain components
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/// x: XPosition,
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/// y: YPosition,
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/// }
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///
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/// // You have to implement `Default` for ignored field types in bundle structs.
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/// #[derive(Default)]
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/// struct Other(f32);
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///
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/// #[derive(Bundle)]
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/// struct NamedPointBundle<T: Send + Sync + 'static> {
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/// // Or other bundles
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/// a: PositionBundle,
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/// // In addition to more components
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/// z: PointName,
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///
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/// // when you need to use `PhantomData` you have to mark it as ignored
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/// #[bundle(ignore)]
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/// _phantom_data: PhantomData<T>
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/// }
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///
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/// #[derive(Component)]
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/// struct PointName(String);
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/// ```
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///
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/// # Safety
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///
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/// Manual implementations of this trait are unsupported.
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/// That is, there is no safe way to implement this trait, and you must not do so.
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/// If you want a type to implement [`Bundle`], you must use [`derive@Bundle`](derive@Bundle).
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///
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/// [`Query`]: crate::system::Query
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// Some safety points:
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// - [`Bundle::component_ids`] must return the [`ComponentId`] for each component type in the
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// bundle, in the _exact_ order that [`DynamicBundle::get_components`] is called.
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// - [`Bundle::from_components`] must call `func` exactly once for each [`ComponentId`] returned by
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// [`Bundle::component_ids`].
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pub unsafe trait Bundle: DynamicBundle + Send + Sync + 'static {
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/// Gets this [`Bundle`]'s component ids, in the order of this bundle's [`Component`]s
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#[doc(hidden)]
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fn component_ids(
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components: &mut Components,
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storages: &mut Storages,
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ids: &mut impl FnMut(ComponentId),
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);
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/// Calls `func`, which should return data for each component in the bundle, in the order of
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/// this bundle's [`Component`]s
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///
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/// # Safety
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/// Caller must return data for each component in the bundle, in the order of this bundle's
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/// [`Component`]s
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#[doc(hidden)]
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unsafe fn from_components<T, F>(ctx: &mut T, func: &mut F) -> Self
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where
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// Ensure that the `OwningPtr` is used correctly
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F: for<'a> FnMut(&'a mut T) -> OwningPtr<'a>,
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Self: Sized;
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}
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/// The parts from [`Bundle`] that don't require statically knowing the components of the bundle.
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pub trait DynamicBundle {
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// SAFETY:
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// The `StorageType` argument passed into [`Bundle::get_components`] must be correct for the
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// component being fetched.
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//
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/// Calls `func` on each value, in the order of this bundle's [`Component`]s. This passes
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/// ownership of the component values to `func`.
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#[doc(hidden)]
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fn get_components(self, func: &mut impl FnMut(StorageType, OwningPtr<'_>));
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}
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// SAFETY:
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// - `Bundle::component_ids` calls `ids` for C's component id (and nothing else)
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// - `Bundle::get_components` is called exactly once for C and passes the component's storage type based on it's associated constant.
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// - `Bundle::from_components` calls `func` exactly once for C, which is the exact value returned by `Bundle::component_ids`.
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unsafe impl<C: Component> Bundle for C {
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fn component_ids(
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components: &mut Components,
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storages: &mut Storages,
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ids: &mut impl FnMut(ComponentId),
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) {
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ids(components.init_component::<C>(storages));
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}
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unsafe fn from_components<T, F>(ctx: &mut T, func: &mut F) -> Self
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where
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// Ensure that the `OwningPtr` is used correctly
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F: for<'a> FnMut(&'a mut T) -> OwningPtr<'a>,
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Self: Sized,
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{
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let ptr = func(ctx);
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// Safety: The id given in `component_ids` is for `Self`
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unsafe { ptr.read() }
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}
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}
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impl<C: Component> DynamicBundle for C {
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#[inline]
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fn get_components(self, func: &mut impl FnMut(StorageType, OwningPtr<'_>)) {
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OwningPtr::make(self, |ptr| func(C::Storage::STORAGE_TYPE, ptr));
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}
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}
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macro_rules! tuple_impl {
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($($name: ident),*) => {
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// SAFETY:
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// - `Bundle::component_ids` calls `ids` for each component type in the
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// bundle, in the exact order that `DynamicBundle::get_components` is called.
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// - `Bundle::from_components` calls `func` exactly once for each `ComponentId` returned by `Bundle::component_ids`.
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// - `Bundle::get_components` is called exactly once for each member. Relies on the above implementation to pass the correct
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// `StorageType` into the callback.
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unsafe impl<$($name: Bundle),*> Bundle for ($($name,)*) {
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#[allow(unused_variables)]
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fn component_ids(components: &mut Components, storages: &mut Storages, ids: &mut impl FnMut(ComponentId)){
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$(<$name as Bundle>::component_ids(components, storages, ids);)*
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}
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#[allow(unused_variables, unused_mut)]
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#[allow(clippy::unused_unit)]
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unsafe fn from_components<T, F>(ctx: &mut T, func: &mut F) -> Self
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where
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F: FnMut(&mut T) -> OwningPtr<'_>
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{
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#[allow(unused_unsafe)]
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// SAFETY: Rust guarantees that tuple calls are evaluated 'left to right'.
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// https://doc.rust-lang.org/reference/expressions.html#evaluation-order-of-operands
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unsafe { ($(<$name as Bundle>::from_components(ctx, func),)*) }
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}
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}
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impl<$($name: Bundle),*> DynamicBundle for ($($name,)*) {
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#[allow(unused_variables, unused_mut)]
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#[inline(always)]
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fn get_components(self, func: &mut impl FnMut(StorageType, OwningPtr<'_>)) {
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#[allow(non_snake_case)]
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let ($(mut $name,)*) = self;
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$(
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$name.get_components(&mut *func);
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)*
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}
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}
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}
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}
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all_tuples!(tuple_impl, 0, 15, B);
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/// For a specific [`World`], this stores a unique value identifying a type of a registered [`Bundle`].
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///
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/// [`World`]: crate::world::World
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#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
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pub struct BundleId(usize);
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impl BundleId {
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/// Returns the index of the associated [`Bundle`] type.
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///
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/// Note that this is unique per-world, and should not be reused across them.
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#[inline]
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pub fn index(self) -> usize {
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self.0
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}
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}
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impl SparseSetIndex for BundleId {
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#[inline]
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fn sparse_set_index(&self) -> usize {
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self.index()
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}
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#[inline]
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fn get_sparse_set_index(value: usize) -> Self {
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Self(value)
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}
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}
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/// Stores metadata associated with a specific type of [`Bundle`] for a given [`World`].
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///
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/// [`World`]: crate::world::World
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pub struct BundleInfo {
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id: BundleId,
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// SAFETY: Every ID in this list must be valid within the World that owns the BundleInfo,
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// must have its storage initialized (i.e. columns created in tables, sparse set created),
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// and must be in the same order as the source bundle type writes its components in.
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component_ids: Vec<ComponentId>,
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}
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impl BundleInfo {
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/// Create a new [`BundleInfo`].
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///
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/// # Safety
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///
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/// Every ID in `component_ids` must be valid within the World that owns the `BundleInfo`,
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/// must have its storage initialized (i.e. columns created in tables, sparse set created),
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/// and must be in the same order as the source bundle type writes its components in.
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unsafe fn new(
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bundle_type_name: &'static str,
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components: &Components,
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component_ids: Vec<ComponentId>,
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id: BundleId,
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) -> BundleInfo {
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let mut deduped = component_ids.clone();
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deduped.sort();
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deduped.dedup();
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if deduped.len() != component_ids.len() {
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// TODO: Replace with `Vec::partition_dedup` once https://github.com/rust-lang/rust/issues/54279 is stabilized
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let mut seen = HashSet::new();
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let mut dups = Vec::new();
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for id in component_ids {
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if !seen.insert(id) {
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dups.push(id);
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}
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}
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let names = dups
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.into_iter()
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.map(|id| {
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// SAFETY: the caller ensures component_id is valid.
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unsafe { components.get_info_unchecked(id).name() }
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})
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.collect::<Vec<_>>()
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.join(", ");
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panic!("Bundle {bundle_type_name} has duplicate components: {names}");
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}
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// SAFETY: The caller ensures that component_ids:
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// - is valid for the associated world
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// - has had its storage initialized
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// - is in the same order as the source bundle type
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BundleInfo { id, component_ids }
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}
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/// Returns a value identifying the associated [`Bundle`] type.
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#[inline]
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pub const fn id(&self) -> BundleId {
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self.id
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}
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/// Returns the [ID](ComponentId) of each component stored in this bundle.
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#[inline]
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pub fn components(&self) -> &[ComponentId] {
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&self.component_ids
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}
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/// Returns an iterator over the [ID](ComponentId) of each component stored in this bundle.
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#[inline]
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pub fn iter_components(&self) -> impl Iterator<Item = ComponentId> + '_ {
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self.component_ids.iter().cloned()
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}
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/// This writes components from a given [`Bundle`] to the given entity.
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///
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/// # Safety
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///
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/// `bundle_component_status` must return the "correct" [`ComponentStatus`] for each component
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/// in the [`Bundle`], with respect to the entity's original archetype (prior to the bundle being added)
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/// For example, if the original archetype already has `ComponentA` and `T` also has `ComponentA`, the status
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/// should be `Mutated`. If the original archetype does not have `ComponentA`, the status should be `Added`.
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/// When "inserting" a bundle into an existing entity, [`AddBundle`]
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/// should be used, which will report `Added` vs `Mutated` status based on the current archetype's structure.
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/// When spawning a bundle, [`SpawnBundleStatus`] can be used instead, which removes the need
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/// to look up the [`AddBundle`] in the archetype graph, which requires
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/// ownership of the entity's current archetype.
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///
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/// `table` must be the "new" table for `entity`. `table_row` must have space allocated for the
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/// `entity`, `bundle` must match this [`BundleInfo`]'s type
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#[inline]
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#[allow(clippy::too_many_arguments)]
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unsafe fn write_components<T: DynamicBundle, S: BundleComponentStatus>(
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&self,
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table: &mut Table,
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sparse_sets: &mut SparseSets,
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bundle_component_status: &S,
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entity: Entity,
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table_row: TableRow,
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change_tick: Tick,
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bundle: T,
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) {
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// NOTE: get_components calls this closure on each component in "bundle order".
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// bundle_info.component_ids are also in "bundle order"
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let mut bundle_component = 0;
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bundle.get_components(&mut |storage_type, component_ptr| {
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let component_id = *self.component_ids.get_unchecked(bundle_component);
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match storage_type {
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StorageType::Table => {
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let column =
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// SAFETY: If component_id is in self.component_ids, BundleInfo::new requires that
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// the target table contains the component.
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unsafe { table.get_column_mut(component_id).debug_checked_unwrap() };
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// SAFETY: bundle_component is a valid index for this bundle
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let status = unsafe { bundle_component_status.get_status(bundle_component) };
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match status {
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ComponentStatus::Added => {
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column.initialize(table_row, component_ptr, change_tick);
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}
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ComponentStatus::Mutated => {
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column.replace(table_row, component_ptr, change_tick);
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}
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}
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}
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StorageType::SparseSet => {
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let sparse_set =
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// SAFETY: If component_id is in self.component_ids, BundleInfo::new requires that
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// a sparse set exists for the component.
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unsafe { sparse_sets.get_mut(component_id).debug_checked_unwrap() };
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sparse_set.insert(entity, component_ptr, change_tick);
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}
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}
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bundle_component += 1;
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});
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}
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/// Adds a bundle to the given archetype and returns the resulting archetype. This could be the
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/// same [`ArchetypeId`], in the event that adding the given bundle does not result in an
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/// [`Archetype`] change. Results are cached in the [`Archetype`] graph to avoid redundant work.
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/// # Safety
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/// `components` must be the same components as passed in [`Self::new`]
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pub(crate) unsafe fn add_bundle_to_archetype(
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&self,
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archetypes: &mut Archetypes,
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storages: &mut Storages,
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components: &Components,
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archetype_id: ArchetypeId,
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) -> ArchetypeId {
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if let Some(add_bundle_id) = archetypes[archetype_id].edges().get_add_bundle(self.id) {
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return add_bundle_id;
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}
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let mut new_table_components = Vec::new();
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let mut new_sparse_set_components = Vec::new();
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let mut bundle_status = Vec::with_capacity(self.component_ids.len());
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let current_archetype = &mut archetypes[archetype_id];
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for component_id in self.component_ids.iter().cloned() {
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if current_archetype.contains(component_id) {
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bundle_status.push(ComponentStatus::Mutated);
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} else {
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bundle_status.push(ComponentStatus::Added);
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// SAFETY: component_id exists
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let component_info = unsafe { components.get_info_unchecked(component_id) };
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match component_info.storage_type() {
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StorageType::Table => new_table_components.push(component_id),
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StorageType::SparseSet => new_sparse_set_components.push(component_id),
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}
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}
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}
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if new_table_components.is_empty() && new_sparse_set_components.is_empty() {
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let edges = current_archetype.edges_mut();
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// the archetype does not change when we add this bundle
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edges.insert_add_bundle(self.id, archetype_id, bundle_status);
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archetype_id
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} else {
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let table_id;
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let table_components;
|
|
let sparse_set_components;
|
|
// the archetype changes when we add this bundle. prepare the new archetype and storages
|
|
{
|
|
let current_archetype = &archetypes[archetype_id];
|
|
table_components = if new_table_components.is_empty() {
|
|
// if there are no new table components, we can keep using this table
|
|
table_id = current_archetype.table_id();
|
|
current_archetype.table_components().collect()
|
|
} else {
|
|
new_table_components.extend(current_archetype.table_components());
|
|
// sort to ignore order while hashing
|
|
new_table_components.sort();
|
|
// SAFETY: all component ids in `new_table_components` exist
|
|
table_id = unsafe {
|
|
storages
|
|
.tables
|
|
.get_id_or_insert(&new_table_components, components)
|
|
};
|
|
|
|
new_table_components
|
|
};
|
|
|
|
sparse_set_components = if new_sparse_set_components.is_empty() {
|
|
current_archetype.sparse_set_components().collect()
|
|
} else {
|
|
new_sparse_set_components.extend(current_archetype.sparse_set_components());
|
|
// sort to ignore order while hashing
|
|
new_sparse_set_components.sort();
|
|
new_sparse_set_components
|
|
};
|
|
};
|
|
// SAFETY: ids in self must be valid
|
|
let new_archetype_id = archetypes.get_id_or_insert(
|
|
components,
|
|
table_id,
|
|
table_components,
|
|
sparse_set_components,
|
|
);
|
|
// add an edge from the old archetype to the new archetype
|
|
archetypes[archetype_id].edges_mut().insert_add_bundle(
|
|
self.id,
|
|
new_archetype_id,
|
|
bundle_status,
|
|
);
|
|
new_archetype_id
|
|
}
|
|
}
|
|
}
|
|
|
|
// SAFETY: We have exclusive world access so our pointers can't be invalidated externally
|
|
pub(crate) struct BundleInserter<'w> {
|
|
world: UnsafeWorldCell<'w>,
|
|
bundle_info: *const BundleInfo,
|
|
add_bundle: *const AddBundle,
|
|
table: *mut Table,
|
|
archetype: *mut Archetype,
|
|
result: InsertBundleResult,
|
|
change_tick: Tick,
|
|
}
|
|
|
|
pub(crate) enum InsertBundleResult {
|
|
SameArchetype,
|
|
NewArchetypeSameTable {
|
|
new_archetype: *mut Archetype,
|
|
},
|
|
NewArchetypeNewTable {
|
|
new_archetype: *mut Archetype,
|
|
new_table: *mut Table,
|
|
},
|
|
}
|
|
|
|
impl<'w> BundleInserter<'w> {
|
|
#[inline]
|
|
pub(crate) fn new<T: Bundle>(
|
|
world: &'w mut World,
|
|
archetype_id: ArchetypeId,
|
|
change_tick: Tick,
|
|
) -> Self {
|
|
let bundle_id = world
|
|
.bundles
|
|
.init_info::<T>(&mut world.components, &mut world.storages);
|
|
// SAFETY: We just ensured this bundle exists
|
|
unsafe { Self::new_with_id(world, archetype_id, bundle_id, change_tick) }
|
|
}
|
|
|
|
/// Creates a new [`BundleInserter`].
|
|
///
|
|
/// # Safety
|
|
/// Caller must ensure that `bundle_id` exists in `world.bundles`
|
|
#[inline]
|
|
pub(crate) unsafe fn new_with_id(
|
|
world: &'w mut World,
|
|
archetype_id: ArchetypeId,
|
|
bundle_id: BundleId,
|
|
change_tick: Tick,
|
|
) -> Self {
|
|
// SAFETY: We will not make any accesses to the command queue, component or resource data of this world
|
|
let bundle_info = world.bundles.get_unchecked(bundle_id);
|
|
let bundle_id = bundle_info.id();
|
|
let new_archetype_id = bundle_info.add_bundle_to_archetype(
|
|
&mut world.archetypes,
|
|
&mut world.storages,
|
|
&world.components,
|
|
archetype_id,
|
|
);
|
|
if new_archetype_id == archetype_id {
|
|
let archetype = &mut world.archetypes[archetype_id];
|
|
// SAFETY: The edge is assured to be initialized when we called add_bundle_to_archetype
|
|
let add_bundle = unsafe {
|
|
archetype
|
|
.edges()
|
|
.get_add_bundle_internal(bundle_id)
|
|
.debug_checked_unwrap()
|
|
};
|
|
let table_id = archetype.table_id();
|
|
let table = &mut world.storages.tables[table_id];
|
|
Self {
|
|
add_bundle,
|
|
archetype,
|
|
bundle_info,
|
|
table,
|
|
result: InsertBundleResult::SameArchetype,
|
|
change_tick,
|
|
world: world.as_unsafe_world_cell(),
|
|
}
|
|
} else {
|
|
let (archetype, new_archetype) =
|
|
world.archetypes.get_2_mut(archetype_id, new_archetype_id);
|
|
// SAFETY: The edge is assured to be initialized when we called add_bundle_to_archetype
|
|
let add_bundle = unsafe {
|
|
archetype
|
|
.edges()
|
|
.get_add_bundle_internal(bundle_id)
|
|
.debug_checked_unwrap()
|
|
};
|
|
let table_id = archetype.table_id();
|
|
let new_table_id = new_archetype.table_id();
|
|
if table_id == new_table_id {
|
|
let table = &mut world.storages.tables[table_id];
|
|
Self {
|
|
add_bundle,
|
|
archetype,
|
|
bundle_info,
|
|
table,
|
|
result: InsertBundleResult::NewArchetypeSameTable { new_archetype },
|
|
change_tick,
|
|
world: world.as_unsafe_world_cell(),
|
|
}
|
|
} else {
|
|
let (table, new_table) = world.storages.tables.get_2_mut(table_id, new_table_id);
|
|
Self {
|
|
add_bundle,
|
|
archetype,
|
|
bundle_info,
|
|
table,
|
|
result: InsertBundleResult::NewArchetypeNewTable {
|
|
new_archetype,
|
|
new_table,
|
|
},
|
|
change_tick,
|
|
world: world.as_unsafe_world_cell(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/// # Safety
|
|
/// `entity` must currently exist in the source archetype for this inserter. `location`
|
|
/// must be `entity`'s location in the archetype. `T` must match this [`BundleInfo`]'s type
|
|
#[inline]
|
|
pub(crate) unsafe fn insert<T: DynamicBundle>(
|
|
&mut self,
|
|
entity: Entity,
|
|
location: EntityLocation,
|
|
bundle: T,
|
|
) -> EntityLocation {
|
|
// SAFETY: We do not make any structural changes to the archetype graph through self.world so these pointers always remain valid
|
|
let trigger_hooks = |archetype: &Archetype, mut world: DeferredWorld| {
|
|
let bundle_info = &*self.bundle_info;
|
|
let add_bundle = &*self.add_bundle;
|
|
|
|
if archetype.has_on_add() {
|
|
world.trigger_on_add(
|
|
entity,
|
|
bundle_info
|
|
.iter_components()
|
|
.zip(add_bundle.bundle_status.iter())
|
|
.filter(|(_, &status)| status == ComponentStatus::Added)
|
|
.map(|(id, _)| id),
|
|
);
|
|
}
|
|
if archetype.has_on_insert() {
|
|
world.trigger_on_insert(entity, bundle_info.iter_components());
|
|
}
|
|
};
|
|
match &mut self.result {
|
|
InsertBundleResult::SameArchetype => {
|
|
{
|
|
// SAFETY: Mutable references do not alias and will be dropped after this block
|
|
let sparse_sets = {
|
|
let world = self.world.world_mut();
|
|
&mut world.storages.sparse_sets
|
|
};
|
|
let table = &mut *self.table;
|
|
let bundle_info = &*self.bundle_info;
|
|
let add_bundle = &*self.add_bundle;
|
|
|
|
bundle_info.write_components(
|
|
table,
|
|
sparse_sets,
|
|
add_bundle,
|
|
entity,
|
|
location.table_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
}
|
|
// SAFETY: We have no outstanding mutable references to world as they were dropped
|
|
unsafe {
|
|
let archetype = &*self.archetype;
|
|
trigger_hooks(archetype, self.world.into_deferred());
|
|
}
|
|
location
|
|
}
|
|
InsertBundleResult::NewArchetypeSameTable { new_archetype } => {
|
|
let new_location = {
|
|
// SAFETY: Mutable references do not alias and will be dropped after this block
|
|
let (sparse_sets, entities) = {
|
|
let world = self.world.world_mut();
|
|
(&mut world.storages.sparse_sets, &mut world.entities)
|
|
};
|
|
let table = &mut *self.table;
|
|
let archetype = &mut *self.archetype;
|
|
let new_archetype = &mut **new_archetype;
|
|
|
|
let result = archetype.swap_remove(location.archetype_row);
|
|
if let Some(swapped_entity) = result.swapped_entity {
|
|
let swapped_location =
|
|
// SAFETY: If the swap was successful, swapped_entity must be valid.
|
|
unsafe { entities.get(swapped_entity).debug_checked_unwrap() };
|
|
entities.set(
|
|
swapped_entity.index(),
|
|
EntityLocation {
|
|
archetype_id: swapped_location.archetype_id,
|
|
archetype_row: location.archetype_row,
|
|
table_id: swapped_location.table_id,
|
|
table_row: swapped_location.table_row,
|
|
},
|
|
);
|
|
}
|
|
let new_location = new_archetype.allocate(entity, result.table_row);
|
|
entities.set(entity.index(), new_location);
|
|
|
|
let bundle_info = &*self.bundle_info;
|
|
let add_bundle = &*self.add_bundle;
|
|
bundle_info.write_components(
|
|
table,
|
|
sparse_sets,
|
|
add_bundle,
|
|
entity,
|
|
result.table_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
new_location
|
|
};
|
|
|
|
// SAFETY: We have no outstanding mutable references to world as they were dropped
|
|
unsafe { trigger_hooks(&**new_archetype, self.world.into_deferred()) };
|
|
|
|
new_location
|
|
}
|
|
InsertBundleResult::NewArchetypeNewTable {
|
|
new_archetype,
|
|
new_table,
|
|
} => {
|
|
let new_location = {
|
|
// SAFETY: Mutable references do not alias and will be dropped after this block
|
|
let (archetypes_ptr, sparse_sets, entities) = {
|
|
let world = self.world.world_mut();
|
|
let archetype_ptr: *mut Archetype =
|
|
world.archetypes.archetypes.as_mut_ptr();
|
|
(
|
|
archetype_ptr,
|
|
&mut world.storages.sparse_sets,
|
|
&mut world.entities,
|
|
)
|
|
};
|
|
let table = &mut *self.table;
|
|
let new_table = &mut **new_table;
|
|
let archetype = &mut *self.archetype;
|
|
let new_archetype = &mut **new_archetype;
|
|
let result = archetype.swap_remove(location.archetype_row);
|
|
if let Some(swapped_entity) = result.swapped_entity {
|
|
let swapped_location =
|
|
// SAFETY: If the swap was successful, swapped_entity must be valid.
|
|
unsafe { entities.get(swapped_entity).debug_checked_unwrap() };
|
|
entities.set(
|
|
swapped_entity.index(),
|
|
EntityLocation {
|
|
archetype_id: swapped_location.archetype_id,
|
|
archetype_row: location.archetype_row,
|
|
table_id: swapped_location.table_id,
|
|
table_row: swapped_location.table_row,
|
|
},
|
|
);
|
|
}
|
|
// PERF: store "non bundle" components in edge, then just move those to avoid
|
|
// redundant copies
|
|
let move_result = table.move_to_superset_unchecked(result.table_row, new_table);
|
|
let new_location = new_archetype.allocate(entity, move_result.new_row);
|
|
entities.set(entity.index(), new_location);
|
|
|
|
// if an entity was moved into this entity's table spot, update its table row
|
|
if let Some(swapped_entity) = move_result.swapped_entity {
|
|
let swapped_location =
|
|
// SAFETY: If the swap was successful, swapped_entity must be valid.
|
|
unsafe { entities.get(swapped_entity).debug_checked_unwrap() };
|
|
let swapped_archetype = if archetype.id() == swapped_location.archetype_id {
|
|
archetype
|
|
} else if new_archetype.id() == swapped_location.archetype_id {
|
|
new_archetype
|
|
} else {
|
|
// SAFETY: the only two borrowed archetypes are above and we just did collision checks
|
|
&mut *archetypes_ptr.add(swapped_location.archetype_id.index())
|
|
};
|
|
|
|
entities.set(
|
|
swapped_entity.index(),
|
|
EntityLocation {
|
|
archetype_id: swapped_location.archetype_id,
|
|
archetype_row: swapped_location.archetype_row,
|
|
table_id: swapped_location.table_id,
|
|
table_row: result.table_row,
|
|
},
|
|
);
|
|
swapped_archetype
|
|
.set_entity_table_row(swapped_location.archetype_row, result.table_row);
|
|
}
|
|
|
|
let bundle_info = &*self.bundle_info;
|
|
let add_bundle = &*self.add_bundle;
|
|
bundle_info.write_components(
|
|
new_table,
|
|
sparse_sets,
|
|
add_bundle,
|
|
entity,
|
|
move_result.new_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
|
|
new_location
|
|
};
|
|
|
|
// SAFETY: We have no outstanding mutable references to world as they were dropped
|
|
unsafe { trigger_hooks(&**new_archetype, self.world.into_deferred()) };
|
|
|
|
new_location
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub(crate) fn entities(&mut self) -> &mut Entities {
|
|
// SAFETY: No outstanding references to self.world, changes to entities cannot invalidate our internal pointers
|
|
unsafe { &mut self.world.world_mut().entities }
|
|
}
|
|
}
|
|
|
|
// SAFETY: We have exclusive world access so our pointers can't be invalidated externally
|
|
pub(crate) struct BundleSpawner<'w> {
|
|
world: UnsafeWorldCell<'w>,
|
|
bundle_info: *const BundleInfo,
|
|
table: *mut Table,
|
|
archetype: *mut Archetype,
|
|
change_tick: Tick,
|
|
}
|
|
|
|
impl<'w> BundleSpawner<'w> {
|
|
#[inline]
|
|
pub fn new<T: Bundle>(world: &'w mut World, change_tick: Tick) -> Self {
|
|
let bundle_id = world
|
|
.bundles
|
|
.init_info::<T>(&mut world.components, &mut world.storages);
|
|
// SAFETY: we initialized this bundle_id in `init_info`
|
|
unsafe { Self::new_with_id(world, bundle_id, change_tick) }
|
|
}
|
|
|
|
/// Creates a new [`BundleSpawner`].
|
|
///
|
|
/// # Safety
|
|
/// Caller must ensure that `bundle_id` exists in `world.bundles`
|
|
#[inline]
|
|
pub(crate) unsafe fn new_with_id(
|
|
world: &'w mut World,
|
|
bundle_id: BundleId,
|
|
change_tick: Tick,
|
|
) -> Self {
|
|
let bundle_info = world.bundles.get_unchecked(bundle_id);
|
|
let new_archetype_id = bundle_info.add_bundle_to_archetype(
|
|
&mut world.archetypes,
|
|
&mut world.storages,
|
|
&world.components,
|
|
ArchetypeId::EMPTY,
|
|
);
|
|
let archetype = &mut world.archetypes[new_archetype_id];
|
|
let table = &mut world.storages.tables[archetype.table_id()];
|
|
Self {
|
|
bundle_info,
|
|
table,
|
|
archetype,
|
|
change_tick,
|
|
world: world.as_unsafe_world_cell(),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn reserve_storage(&mut self, additional: usize) {
|
|
// SAFETY: There are no outstanding world references
|
|
let (archetype, table) = unsafe { (&mut *self.archetype, &mut *self.table) };
|
|
archetype.reserve(additional);
|
|
table.reserve(additional);
|
|
}
|
|
|
|
/// # Safety
|
|
/// `entity` must be allocated (but non-existent), `T` must match this [`BundleInfo`]'s type
|
|
#[inline]
|
|
pub unsafe fn spawn_non_existent<T: DynamicBundle>(
|
|
&mut self,
|
|
entity: Entity,
|
|
bundle: T,
|
|
) -> EntityLocation {
|
|
// SAFETY: We do not make any structural changes to the archetype graph through self.world so this pointer always remain valid
|
|
let location = {
|
|
// SAFETY: Mutable references do not alias and will be dropped after this block
|
|
let (sparse_sets, entities) = {
|
|
let world = self.world.world_mut();
|
|
(&mut world.storages.sparse_sets, &mut world.entities)
|
|
};
|
|
let table = &mut *self.table;
|
|
let archetype = &mut *self.archetype;
|
|
let table_row = table.allocate(entity);
|
|
let location = archetype.allocate(entity, table_row);
|
|
let bundle_info = &*self.bundle_info;
|
|
bundle_info.write_components(
|
|
table,
|
|
sparse_sets,
|
|
&SpawnBundleStatus,
|
|
entity,
|
|
table_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
entities.set(entity.index(), location);
|
|
location
|
|
};
|
|
|
|
// SAFETY: We have no outstanding mutable references to world as they were dropped
|
|
unsafe {
|
|
let archetype = &*self.archetype;
|
|
let bundle_info = &*self.bundle_info;
|
|
let mut world = self.world.into_deferred();
|
|
if archetype.has_on_add() {
|
|
world.trigger_on_add(entity, bundle_info.iter_components());
|
|
}
|
|
if archetype.has_on_insert() {
|
|
world.trigger_on_insert(entity, bundle_info.iter_components());
|
|
}
|
|
}
|
|
|
|
location
|
|
}
|
|
|
|
/// # Safety
|
|
/// `T` must match this [`BundleInfo`]'s type
|
|
#[inline]
|
|
pub unsafe fn spawn<T: Bundle>(&mut self, bundle: T) -> Entity {
|
|
let entity = self.entities().alloc();
|
|
// SAFETY: entity is allocated (but non-existent), `T` matches this BundleInfo's type
|
|
unsafe {
|
|
self.spawn_non_existent(entity, bundle);
|
|
}
|
|
entity
|
|
}
|
|
|
|
#[inline]
|
|
pub(crate) fn entities(&mut self) -> &mut Entities {
|
|
// SAFETY: No outstanding references to self.world, changes to entities cannot invalidate our internal pointers
|
|
unsafe { &mut self.world.world_mut().entities }
|
|
}
|
|
|
|
/// # Safety:
|
|
/// - `Self` must be dropped after running this function as it may invalidate internal pointers.
|
|
#[inline]
|
|
pub(crate) unsafe fn flush_commands(&mut self) {
|
|
// SAFETY: pointers on self can be invalidated,
|
|
self.world.world_mut().flush_commands();
|
|
}
|
|
}
|
|
|
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/// Metadata for bundles. Stores a [`BundleInfo`] for each type of [`Bundle`] in a given world.
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#[derive(Default)]
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pub struct Bundles {
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bundle_infos: Vec<BundleInfo>,
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/// Cache static [`BundleId`]
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bundle_ids: TypeIdMap<BundleId>,
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/// Cache dynamic [`BundleId`] with multiple components
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dynamic_bundle_ids: HashMap<Box<[ComponentId]>, BundleId>,
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dynamic_bundle_storages: HashMap<BundleId, Vec<StorageType>>,
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/// Cache optimized dynamic [`BundleId`] with single component
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dynamic_component_bundle_ids: HashMap<ComponentId, BundleId>,
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dynamic_component_storages: HashMap<BundleId, StorageType>,
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}
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impl Bundles {
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/// Gets the metadata associated with a specific type of bundle.
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/// Returns `None` if the bundle is not registered with the world.
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#[inline]
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pub fn get(&self, bundle_id: BundleId) -> Option<&BundleInfo> {
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self.bundle_infos.get(bundle_id.index())
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}
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/// Gets the value identifying a specific type of bundle.
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/// Returns `None` if the bundle does not exist in the world,
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/// or if `type_id` does not correspond to a type of bundle.
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#[inline]
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pub fn get_id(&self, type_id: TypeId) -> Option<BundleId> {
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self.bundle_ids.get(&type_id).cloned()
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}
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/// Initializes a new [`BundleInfo`] for a statically known type.
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pub(crate) fn init_info<T: Bundle>(
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&mut self,
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components: &mut Components,
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storages: &mut Storages,
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) -> BundleId {
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let bundle_infos = &mut self.bundle_infos;
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let id = *self.bundle_ids.entry(TypeId::of::<T>()).or_insert_with(|| {
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let mut component_ids = Vec::new();
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T::component_ids(components, storages, &mut |id| component_ids.push(id));
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let id = BundleId(bundle_infos.len());
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let bundle_info =
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// SAFETY: T::component_id ensures its:
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// - info was created
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// - appropriate storage for it has been initialized.
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// - was created in the same order as the components in T
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unsafe { BundleInfo::new(std::any::type_name::<T>(), components, component_ids, id) };
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bundle_infos.push(bundle_info);
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id
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});
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id
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}
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pub(crate) unsafe fn get_unchecked(&self, id: BundleId) -> &BundleInfo {
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self.bundle_infos.get_unchecked(id.0)
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}
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pub(crate) unsafe fn get_storage_unchecked(&self, id: BundleId) -> StorageType {
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*self
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.dynamic_component_storages
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.get(&id)
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.debug_checked_unwrap()
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}
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pub(crate) unsafe fn get_storages_unchecked(&mut self, id: BundleId) -> &mut Vec<StorageType> {
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self.dynamic_bundle_storages
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.get_mut(&id)
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.debug_checked_unwrap()
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}
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/// Initializes a new [`BundleInfo`] for a dynamic [`Bundle`].
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///
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/// # Panics
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///
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/// Panics if any of the provided [`ComponentId`]s do not exist in the
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/// provided [`Components`].
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pub(crate) fn init_dynamic_info(
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&mut self,
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components: &Components,
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component_ids: &[ComponentId],
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) -> BundleId {
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let bundle_infos = &mut self.bundle_infos;
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// Use `raw_entry_mut` to avoid cloning `component_ids` to access `Entry`
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let (_, bundle_id) = self
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.dynamic_bundle_ids
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.raw_entry_mut()
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.from_key(component_ids)
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.or_insert_with(|| {
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let (id, storages) =
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initialize_dynamic_bundle(bundle_infos, components, Vec::from(component_ids));
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self.dynamic_bundle_storages
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.insert_unique_unchecked(id, storages);
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(component_ids.into(), id)
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});
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*bundle_id
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}
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/// Initializes a new [`BundleInfo`] for a dynamic [`Bundle`] with single component.
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///
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/// # Panics
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///
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/// Panics if the provided [`ComponentId`] does not exist in the provided [`Components`].
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pub(crate) fn init_component_info(
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&mut self,
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components: &Components,
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component_id: ComponentId,
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) -> BundleId {
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let bundle_infos = &mut self.bundle_infos;
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let bundle_id = self
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.dynamic_component_bundle_ids
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.entry(component_id)
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.or_insert_with(|| {
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let (id, storage_type) =
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initialize_dynamic_bundle(bundle_infos, components, vec![component_id]);
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self.dynamic_component_storages.insert(id, storage_type[0]);
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id
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});
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*bundle_id
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}
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}
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/// Asserts that all components are part of [`Components`]
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/// and initializes a [`BundleInfo`].
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fn initialize_dynamic_bundle(
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bundle_infos: &mut Vec<BundleInfo>,
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components: &Components,
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component_ids: Vec<ComponentId>,
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) -> (BundleId, Vec<StorageType>) {
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// Assert component existence
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let storage_types = component_ids.iter().map(|&id| {
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components.get_info(id).unwrap_or_else(|| {
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panic!(
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"init_dynamic_info called with component id {id:?} which doesn't exist in this world"
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)
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}).storage_type()
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}).collect();
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let id = BundleId(bundle_infos.len());
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let bundle_info =
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// SAFETY: `component_ids` are valid as they were just checked
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unsafe { BundleInfo::new("<dynamic bundle>", components, component_ids, id) };
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bundle_infos.push(bundle_info);
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(id, storage_types)
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}
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#[cfg(test)]
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mod tests {
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use crate as bevy_ecs;
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use crate::prelude::*;
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#[derive(Component)]
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struct A;
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#[derive(Component)]
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struct B;
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#[derive(Component)]
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struct C;
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#[derive(Component)]
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struct D;
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#[derive(Resource, Default)]
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struct R(usize);
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impl R {
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#[track_caller]
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fn assert_order(&mut self, count: usize) {
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assert_eq!(count, self.0);
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self.0 += 1;
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}
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}
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#[test]
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fn component_hook_order_spawn_despawn() {
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let mut world = World::new();
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world.init_resource::<R>();
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world
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.register_component_hooks::<A>()
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.on_add(|mut world, _, _| {
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world.resource_mut::<R>().assert_order(0);
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})
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.on_insert(|mut world, _, _| world.resource_mut::<R>().assert_order(1))
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.on_remove(|mut world, _, _| world.resource_mut::<R>().assert_order(2));
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let entity = world.spawn(A).id();
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world.despawn(entity);
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assert_eq!(3, world.resource::<R>().0);
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}
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#[test]
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fn component_hook_order_insert_remove() {
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let mut world = World::new();
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world.init_resource::<R>();
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world
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.register_component_hooks::<A>()
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.on_add(|mut world, _, _| {
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world.resource_mut::<R>().assert_order(0);
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})
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.on_insert(|mut world, _, _| {
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world.resource_mut::<R>().assert_order(1);
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})
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.on_remove(|mut world, _, _| {
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world.resource_mut::<R>().assert_order(2);
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});
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|
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let mut entity = world.spawn_empty();
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entity.insert(A);
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entity.remove::<A>();
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entity.flush();
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assert_eq!(3, world.resource::<R>().0);
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}
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|
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#[test]
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fn component_hook_order_recursive() {
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let mut world = World::new();
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world.init_resource::<R>();
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world
|
|
.register_component_hooks::<A>()
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.on_add(|mut world, entity, _| {
|
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world.resource_mut::<R>().assert_order(0);
|
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world.commands().entity(entity).insert(B);
|
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})
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.on_remove(|mut world, entity, _| {
|
|
world.resource_mut::<R>().assert_order(2);
|
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world.commands().entity(entity).remove::<B>();
|
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});
|
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|
|
world
|
|
.register_component_hooks::<B>()
|
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.on_add(|mut world, entity, _| {
|
|
world.resource_mut::<R>().assert_order(1);
|
|
world.commands().entity(entity).remove::<A>();
|
|
})
|
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.on_remove(|mut world, _, _| {
|
|
world.resource_mut::<R>().assert_order(3);
|
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});
|
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|
|
let entity = world.spawn(A).flush();
|
|
let entity = world.get_entity(entity).unwrap();
|
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assert!(!entity.contains::<A>());
|
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assert!(!entity.contains::<B>());
|
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assert_eq!(4, world.resource::<R>().0);
|
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}
|
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|
|
#[test]
|
|
fn component_hook_order_recursive_multiple() {
|
|
let mut world = World::new();
|
|
world.init_resource::<R>();
|
|
world
|
|
.register_component_hooks::<A>()
|
|
.on_add(|mut world, entity, _| {
|
|
world.resource_mut::<R>().assert_order(0);
|
|
world.commands().entity(entity).insert(B).insert(D);
|
|
});
|
|
|
|
world
|
|
.register_component_hooks::<B>()
|
|
.on_add(|mut world, entity, _| {
|
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world.resource_mut::<R>().assert_order(1);
|
|
world.commands().entity(entity).insert(C);
|
|
});
|
|
|
|
world
|
|
.register_component_hooks::<C>()
|
|
.on_add(|mut world, _, _| {
|
|
world.resource_mut::<R>().assert_order(2);
|
|
});
|
|
|
|
world
|
|
.register_component_hooks::<D>()
|
|
.on_add(|mut world, _, _| {
|
|
world.resource_mut::<R>().assert_order(3);
|
|
});
|
|
|
|
world.spawn(A).flush();
|
|
assert_eq!(4, world.resource::<R>().0);
|
|
}
|
|
}
|