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https://github.com/bevyengine/bevy
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507441d96f
#3457 adds the `doc_markdown` clippy lint, which checks doc comments to make sure code identifiers are escaped with backticks. This causes a lot of lint errors, so this is one of a number of PR's that will fix those lint errors one crate at a time. This PR fixes lints in the `bevy_ecs` crate.
642 lines
23 KiB
Rust
642 lines
23 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 crate::{
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archetype::{AddBundle, Archetype, ArchetypeId, Archetypes, ComponentStatus},
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component::{Component, ComponentId, ComponentTicks, Components, StorageType},
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entity::{Entities, Entity, EntityLocation},
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storage::{SparseSetIndex, SparseSets, Storages, Table},
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};
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use bevy_ecs_macros::all_tuples;
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use std::{any::TypeId, collections::HashMap};
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/// An ordered collection of [`Component`]s.
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///
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/// Commonly used for spawning entities and adding and removing components in bulk. This
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/// trait is automatically implemented for tuples of components: `(ComponentA, ComponentB)`
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/// is a very convenient shorthand when working with one-off collections of components. Note
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/// that both the unit type `()` and `(ComponentA, )` are valid bundles. The unit bundle is
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/// particularly useful for spawning multiple empty entities by using
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/// [`Commands::spawn_batch`](crate::system::Commands::spawn_batch).
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///
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/// # Examples
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///
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/// Typically, you will simply use `#[derive(Bundle)]` when creating your own `Bundle`. Each
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/// struct field is a component:
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///
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/// ```
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/// # use bevy_ecs::prelude::*;
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/// # #[derive(Component)]
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/// # struct ComponentA;
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/// # #[derive(Component)]
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/// # struct ComponentB;
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/// # #[derive(Component)]
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/// # struct ComponentC;
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/// #
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/// #[derive(Bundle)]
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/// struct MyBundle {
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/// a: ComponentA,
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/// b: ComponentB,
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/// c: ComponentC,
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/// }
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/// ```
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///
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/// You can nest bundles using the `#[bundle]` attribute:
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/// ```
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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 X(i32);
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/// #[derive(Component)]
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/// struct Y(u64);
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/// #[derive(Component)]
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/// struct Z(String);
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///
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/// #[derive(Bundle)]
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/// struct A {
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/// x: X,
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/// y: Y,
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/// }
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///
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/// #[derive(Bundle)]
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/// struct B {
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/// #[bundle]
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/// a: A,
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/// z: Z,
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/// }
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/// ```
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///
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/// # Safety
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///
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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 [`Bundle::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: 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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fn component_ids(components: &mut Components, storages: &mut Storages) -> Vec<ComponentId>;
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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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unsafe fn from_components(func: impl FnMut() -> *mut u8) -> Self
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where
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Self: Sized;
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/// Calls `func` on each value, in the order of this bundle's [`Component`]s. This will
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/// [`std::mem::forget`] the bundle fields, so callers are responsible for dropping the fields
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/// if that is desirable.
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fn get_components(self, func: impl FnMut(*mut u8));
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}
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macro_rules! tuple_impl {
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($($name: ident),*) => {
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unsafe impl<$($name: Component),*> Bundle for ($($name,)*) {
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#[allow(unused_variables)]
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fn component_ids(components: &mut Components, storages: &mut Storages) -> Vec<ComponentId> {
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vec![$(components.init_component::<$name>(storages)),*]
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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(mut func: impl FnMut() -> *mut u8) -> Self {
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#[allow(non_snake_case)]
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let ($(mut $name,)*) = (
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$(func().cast::<$name>(),)*
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);
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($($name.read(),)*)
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}
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#[allow(unused_variables, unused_mut)]
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fn get_components(self, mut func: impl FnMut(*mut u8)) {
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#[allow(non_snake_case)]
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let ($(mut $name,)*) = self;
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$(
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func((&mut $name as *mut $name).cast::<u8>());
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std::mem::forget($name);
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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, C);
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#[derive(Debug, Clone, Copy)]
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pub struct BundleId(usize);
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impl BundleId {
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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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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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pub struct BundleInfo {
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pub(crate) id: BundleId,
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pub(crate) component_ids: Vec<ComponentId>,
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pub(crate) storage_types: Vec<StorageType>,
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}
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impl BundleInfo {
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#[inline]
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pub fn id(&self) -> BundleId {
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self.id
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}
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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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#[inline]
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pub fn storage_types(&self) -> &[StorageType] {
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&self.storage_types
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}
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pub(crate) fn get_bundle_inserter<'a, 'b>(
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&'b self,
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entities: &'a mut Entities,
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archetypes: &'a mut Archetypes,
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components: &mut Components,
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storages: &'a mut Storages,
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archetype_id: ArchetypeId,
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change_tick: u32,
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) -> BundleInserter<'a, 'b> {
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let new_archetype_id =
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self.add_bundle_to_archetype(archetypes, storages, components, archetype_id);
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let archetypes_ptr = archetypes.archetypes.as_mut_ptr();
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if new_archetype_id == archetype_id {
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let archetype = &mut archetypes[archetype_id];
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let table_id = archetype.table_id();
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BundleInserter {
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bundle_info: self,
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archetype,
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entities,
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sparse_sets: &mut storages.sparse_sets,
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table: &mut storages.tables[table_id],
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archetypes_ptr,
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change_tick,
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result: InsertBundleResult::SameArchetype,
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}
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} else {
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let (archetype, new_archetype) = archetypes.get_2_mut(archetype_id, new_archetype_id);
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let table_id = archetype.table_id();
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if table_id == new_archetype.table_id() {
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BundleInserter {
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bundle_info: self,
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archetype,
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archetypes_ptr,
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entities,
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sparse_sets: &mut storages.sparse_sets,
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table: &mut storages.tables[table_id],
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change_tick,
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result: InsertBundleResult::NewArchetypeSameTable { new_archetype },
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}
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} else {
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let (table, new_table) = storages
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.tables
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.get_2_mut(table_id, new_archetype.table_id());
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BundleInserter {
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bundle_info: self,
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archetype,
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sparse_sets: &mut storages.sparse_sets,
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entities,
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archetypes_ptr,
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table,
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change_tick,
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result: InsertBundleResult::NewArchetypeNewTable {
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new_archetype,
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new_table,
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},
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}
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}
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}
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}
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pub(crate) fn get_bundle_spawner<'a, 'b>(
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&'b self,
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entities: &'a mut Entities,
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archetypes: &'a mut Archetypes,
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components: &mut Components,
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storages: &'a mut Storages,
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change_tick: u32,
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) -> BundleSpawner<'a, 'b> {
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let new_archetype_id =
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self.add_bundle_to_archetype(archetypes, storages, components, ArchetypeId::EMPTY);
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let (empty_archetype, archetype) =
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archetypes.get_2_mut(ArchetypeId::EMPTY, new_archetype_id);
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let table = &mut storages.tables[archetype.table_id()];
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let add_bundle = empty_archetype.edges().get_add_bundle(self.id()).unwrap();
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BundleSpawner {
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archetype,
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add_bundle,
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bundle_info: self,
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table,
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entities,
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sparse_sets: &mut storages.sparse_sets,
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change_tick,
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}
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}
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/// # Safety
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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: Bundle>(
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&self,
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table: &mut Table,
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sparse_sets: &mut SparseSets,
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add_bundle: &AddBundle,
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entity: Entity,
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table_row: usize,
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change_tick: u32,
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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(|component_ptr| {
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let component_id = *self.component_ids.get_unchecked(bundle_component);
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match self.storage_types[bundle_component] {
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StorageType::Table => {
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let column = table.get_column_mut(component_id).unwrap();
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match add_bundle.bundle_status.get_unchecked(bundle_component) {
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ComponentStatus::Added => {
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column.initialize(
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table_row,
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component_ptr,
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ComponentTicks::new(change_tick),
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);
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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 = sparse_sets.get_mut(component_id).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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pub(crate) 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: &mut Components,
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archetype_id: ArchetypeId,
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) -> ArchetypeId {
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if let Some(add_bundle) = archetypes[archetype_id].edges().get_add_bundle(self.id) {
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return add_bundle.archetype_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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// SAFE: 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;
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let sparse_set_components;
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// the archetype changes when we add this bundle. prepare the new archetype and storages
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{
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let current_archetype = &archetypes[archetype_id];
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table_components = if new_table_components.is_empty() {
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// if there are no new table components, we can keep using this table
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table_id = current_archetype.table_id();
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current_archetype.table_components().to_vec()
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} else {
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new_table_components.extend(current_archetype.table_components());
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// sort to ignore order while hashing
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new_table_components.sort();
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// SAFE: all component ids in `new_table_components` exist
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table_id = unsafe {
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storages
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.tables
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.get_id_or_insert(&new_table_components, components)
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};
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new_table_components
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};
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sparse_set_components = if new_sparse_set_components.is_empty() {
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current_archetype.sparse_set_components().to_vec()
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} else {
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new_sparse_set_components.extend(current_archetype.sparse_set_components());
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// sort to ignore order while hashing
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new_sparse_set_components.sort();
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new_sparse_set_components
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};
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};
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let new_archetype_id =
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archetypes.get_id_or_insert(table_id, table_components, sparse_set_components);
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// add an edge from the old archetype to the new archetype
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archetypes[archetype_id].edges_mut().insert_add_bundle(
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self.id,
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new_archetype_id,
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bundle_status,
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);
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new_archetype_id
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}
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}
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}
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pub(crate) struct BundleInserter<'a, 'b> {
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pub(crate) archetype: &'a mut Archetype,
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pub(crate) entities: &'a mut Entities,
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bundle_info: &'b BundleInfo,
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table: &'a mut Table,
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sparse_sets: &'a mut SparseSets,
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result: InsertBundleResult<'a>,
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archetypes_ptr: *mut Archetype,
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change_tick: u32,
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}
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pub(crate) enum InsertBundleResult<'a> {
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SameArchetype,
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NewArchetypeSameTable {
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new_archetype: &'a mut Archetype,
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},
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NewArchetypeNewTable {
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new_archetype: &'a mut Archetype,
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new_table: &'a mut Table,
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},
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}
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impl<'a, 'b> BundleInserter<'a, 'b> {
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/// # Safety
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/// `entity` must currently exist in the source archetype for this inserter. `archetype_index`
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/// must be `entity`'s location in the archetype. `T` must match this [`BundleInfo`]'s type
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#[inline]
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pub unsafe fn insert<T: Bundle>(
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&mut self,
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entity: Entity,
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archetype_index: usize,
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bundle: T,
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) -> EntityLocation {
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let location = EntityLocation {
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index: archetype_index,
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archetype_id: self.archetype.id(),
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};
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match &mut self.result {
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InsertBundleResult::SameArchetype => {
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// PERF: this could be looked up during Inserter construction and stored (but borrowing makes this nasty)
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let add_bundle = self
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.archetype
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.edges()
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.get_add_bundle(self.bundle_info.id)
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.unwrap();
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self.bundle_info.write_components(
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self.table,
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self.sparse_sets,
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add_bundle,
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entity,
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self.archetype.entity_table_row(archetype_index),
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self.change_tick,
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bundle,
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);
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location
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}
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InsertBundleResult::NewArchetypeSameTable { new_archetype } => {
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let result = self.archetype.swap_remove(location.index);
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if let Some(swapped_entity) = result.swapped_entity {
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self.entities.meta[swapped_entity.id as usize].location = location;
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}
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let new_location = new_archetype.allocate(entity, result.table_row);
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self.entities.meta[entity.id as usize].location = new_location;
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// PERF: this could be looked up during Inserter construction and stored (but borrowing makes this nasty)
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let add_bundle = self
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.archetype
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.edges()
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.get_add_bundle(self.bundle_info.id)
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.unwrap();
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self.bundle_info.write_components(
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self.table,
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self.sparse_sets,
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add_bundle,
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entity,
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result.table_row,
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self.change_tick,
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bundle,
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);
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new_location
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}
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InsertBundleResult::NewArchetypeNewTable {
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new_archetype,
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new_table,
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} => {
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let result = self.archetype.swap_remove(location.index);
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if let Some(swapped_entity) = result.swapped_entity {
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self.entities.meta[swapped_entity.id as usize].location = location;
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}
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// PERF: store "non bundle" components in edge, then just move those to avoid
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// redundant copies
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let move_result = self
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.table
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.move_to_superset_unchecked(result.table_row, *new_table);
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let new_location = new_archetype.allocate(entity, move_result.new_row);
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self.entities.meta[entity.id as usize].location = new_location;
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// 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 = self.entities.get(swapped_entity).unwrap();
|
|
let swapped_archetype = if self.archetype.id() == swapped_location.archetype_id
|
|
{
|
|
&mut *self.archetype
|
|
} else if new_archetype.id() == swapped_location.archetype_id {
|
|
&mut *new_archetype
|
|
} else {
|
|
// SAFE: the only two borrowed archetypes are above and we just did collision checks
|
|
&mut *self
|
|
.archetypes_ptr
|
|
.add(swapped_location.archetype_id.index())
|
|
};
|
|
|
|
swapped_archetype
|
|
.set_entity_table_row(swapped_location.index, result.table_row);
|
|
}
|
|
|
|
// PERF: this could be looked up during Inserter construction and stored (but borrowing makes this nasty)
|
|
let add_bundle = self
|
|
.archetype
|
|
.edges()
|
|
.get_add_bundle(self.bundle_info.id)
|
|
.unwrap();
|
|
self.bundle_info.write_components(
|
|
new_table,
|
|
self.sparse_sets,
|
|
add_bundle,
|
|
entity,
|
|
move_result.new_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
new_location
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub(crate) struct BundleSpawner<'a, 'b> {
|
|
pub(crate) archetype: &'a mut Archetype,
|
|
pub(crate) entities: &'a mut Entities,
|
|
add_bundle: &'a AddBundle,
|
|
bundle_info: &'b BundleInfo,
|
|
table: &'a mut Table,
|
|
sparse_sets: &'a mut SparseSets,
|
|
change_tick: u32,
|
|
}
|
|
|
|
impl<'a, 'b> BundleSpawner<'a, 'b> {
|
|
pub fn reserve_storage(&mut self, additional: usize) {
|
|
self.archetype.reserve(additional);
|
|
self.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: Bundle>(
|
|
&mut self,
|
|
entity: Entity,
|
|
bundle: T,
|
|
) -> EntityLocation {
|
|
let table_row = self.table.allocate(entity);
|
|
let location = self.archetype.allocate(entity, table_row);
|
|
self.bundle_info.write_components(
|
|
self.table,
|
|
self.sparse_sets,
|
|
self.add_bundle,
|
|
entity,
|
|
table_row,
|
|
self.change_tick,
|
|
bundle,
|
|
);
|
|
self.entities.meta[entity.id as usize].location = location;
|
|
|
|
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();
|
|
// SAFE: entity is allocated (but non-existent), `T` matches this BundleInfo's type
|
|
self.spawn_non_existent(entity, bundle);
|
|
entity
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct Bundles {
|
|
bundle_infos: Vec<BundleInfo>,
|
|
bundle_ids: HashMap<TypeId, BundleId>,
|
|
}
|
|
|
|
impl Bundles {
|
|
#[inline]
|
|
pub fn get(&self, bundle_id: BundleId) -> Option<&BundleInfo> {
|
|
self.bundle_infos.get(bundle_id.index())
|
|
}
|
|
|
|
#[inline]
|
|
pub fn get_id(&self, type_id: TypeId) -> Option<BundleId> {
|
|
self.bundle_ids.get(&type_id).cloned()
|
|
}
|
|
|
|
pub(crate) fn init_info<'a, T: Bundle>(
|
|
&'a mut self,
|
|
components: &mut Components,
|
|
storages: &mut Storages,
|
|
) -> &'a BundleInfo {
|
|
let bundle_infos = &mut self.bundle_infos;
|
|
let id = self.bundle_ids.entry(TypeId::of::<T>()).or_insert_with(|| {
|
|
let component_ids = T::component_ids(components, storages);
|
|
let id = BundleId(bundle_infos.len());
|
|
// SAFE: T::component_id ensures info was created
|
|
let bundle_info = unsafe {
|
|
initialize_bundle(std::any::type_name::<T>(), component_ids, id, components)
|
|
};
|
|
bundle_infos.push(bundle_info);
|
|
id
|
|
});
|
|
// SAFE: index either exists, or was initialized
|
|
unsafe { self.bundle_infos.get_unchecked(id.0) }
|
|
}
|
|
}
|
|
|
|
/// # Safety
|
|
///
|
|
/// `component_id` must be valid [`ComponentId`]'s
|
|
unsafe fn initialize_bundle(
|
|
bundle_type_name: &'static str,
|
|
component_ids: Vec<ComponentId>,
|
|
id: BundleId,
|
|
components: &mut Components,
|
|
) -> BundleInfo {
|
|
let mut storage_types = Vec::new();
|
|
|
|
for &component_id in &component_ids {
|
|
// SAFE: component_id exists and is therefore valid
|
|
let component_info = components.get_info_unchecked(component_id);
|
|
storage_types.push(component_info.storage_type());
|
|
}
|
|
|
|
let mut deduped = component_ids.clone();
|
|
deduped.sort();
|
|
deduped.dedup();
|
|
if deduped.len() != component_ids.len() {
|
|
panic!("Bundle {} has duplicate components", bundle_type_name);
|
|
}
|
|
|
|
BundleInfo {
|
|
id,
|
|
component_ids,
|
|
storage_types,
|
|
}
|
|
}
|