Extract clone-related items from component
This commit is contained in:
Giacomo Stevanato
parent
9e0f9023ce
commit
2f16cadac5
217
crates/bevy_ecs/src/component/clone.rs
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217
crates/bevy_ecs/src/component/clone.rs
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@ -0,0 +1,217 @@
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use alloc::boxed::Box;
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use bevy_ptr::OwningPtr;
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use core::marker::PhantomData;
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use crate::component::Component;
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use crate::entity::{ComponentCloneCtx, EntityMapper, SourceComponent};
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use crate::world::World;
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/// Function type that can be used to clone an entity.
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pub type ComponentCloneFn = fn(&SourceComponent, &mut ComponentCloneCtx);
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/// The clone behavior to use when cloning a [`Component`].
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#[derive(Clone, Debug, Default, PartialEq, Eq)]
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pub enum ComponentCloneBehavior {
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/// Uses the default behavior (which is passed to [`ComponentCloneBehavior::resolve`])
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#[default]
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Default,
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/// Do not clone this component.
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Ignore,
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/// Uses a custom [`ComponentCloneFn`].
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Custom(ComponentCloneFn),
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}
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impl ComponentCloneBehavior {
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/// Set clone handler based on `Clone` trait.
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///
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/// If set as a handler for a component that is not the same as the one used to create this handler, it will panic.
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pub fn clone<C: Component + Clone>() -> Self {
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Self::Custom(component_clone_via_clone::<C>)
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}
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/// Set clone handler based on `Reflect` trait.
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#[cfg(feature = "bevy_reflect")]
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pub fn reflect() -> Self {
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Self::Custom(component_clone_via_reflect)
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}
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/// Returns the "global default"
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pub fn global_default_fn() -> ComponentCloneFn {
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#[cfg(feature = "bevy_reflect")]
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return component_clone_via_reflect;
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#[cfg(not(feature = "bevy_reflect"))]
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return component_clone_ignore;
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}
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/// Resolves the [`ComponentCloneBehavior`] to a [`ComponentCloneFn`]. If [`ComponentCloneBehavior::Default`] is
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/// specified, the given `default` function will be used.
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pub fn resolve(&self, default: ComponentCloneFn) -> ComponentCloneFn {
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match self {
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ComponentCloneBehavior::Default => default,
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ComponentCloneBehavior::Ignore => component_clone_ignore,
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ComponentCloneBehavior::Custom(custom) => *custom,
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}
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}
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}
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/// Component [clone handler function](ComponentCloneFn) implemented using the [`Clone`] trait.
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/// Can be [set](Component::clone_behavior) as clone handler for the specific component it is implemented for.
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/// It will panic if set as handler for any other component.
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///
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pub fn component_clone_via_clone<C: Clone + Component>(
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source: &SourceComponent,
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ctx: &mut ComponentCloneCtx,
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) {
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if let Some(component) = source.read::<C>() {
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ctx.write_target_component(component.clone());
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}
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}
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/// Component [clone handler function](ComponentCloneFn) implemented using reflect.
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/// Can be [set](Component::clone_behavior) as clone handler for any registered component,
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/// but only reflected components will be cloned.
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///
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/// To clone a component using this handler, the following must be true:
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/// - World has [`AppTypeRegistry`](crate::reflect::AppTypeRegistry)
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/// - Component has [`TypeId`]
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/// - Component is registered
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/// - Component has [`ReflectFromPtr`](bevy_reflect::ReflectFromPtr) registered
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/// - Component can be cloned via [`PartialReflect::reflect_clone`] _or_ has one of the following registered: [`ReflectFromReflect`](bevy_reflect::ReflectFromReflect),
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/// [`ReflectDefault`](bevy_reflect::std_traits::ReflectDefault), [`ReflectFromWorld`](crate::reflect::ReflectFromWorld)
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///
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/// If any of the conditions is not satisfied, the component will be skipped.
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///
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/// See [`EntityClonerBuilder`](crate::entity::EntityClonerBuilder) for details.
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///
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/// [`PartialReflect::reflect_clone`]: bevy_reflect::PartialReflect::reflect_clone
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#[cfg(feature = "bevy_reflect")]
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pub fn component_clone_via_reflect(source: &SourceComponent, ctx: &mut ComponentCloneCtx) {
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let Some(app_registry) = ctx.type_registry().cloned() else {
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return;
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};
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let registry = app_registry.read();
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let Some(source_component_reflect) = source.read_reflect(®istry) else {
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return;
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};
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let component_info = ctx.component_info();
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// checked in read_source_component_reflect
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let type_id = component_info.type_id().unwrap();
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// Try to clone using `reflect_clone`
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if let Ok(mut component) = source_component_reflect.reflect_clone() {
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if let Some(reflect_component) =
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registry.get_type_data::<crate::reflect::ReflectComponent>(type_id)
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{
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reflect_component.map_entities(&mut *component, ctx.entity_mapper());
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}
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drop(registry);
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ctx.write_target_component_reflect(component);
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return;
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}
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// Try to clone using ReflectFromReflect
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if let Some(reflect_from_reflect) =
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registry.get_type_data::<bevy_reflect::ReflectFromReflect>(type_id)
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{
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if let Some(mut component) =
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reflect_from_reflect.from_reflect(source_component_reflect.as_partial_reflect())
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{
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if let Some(reflect_component) =
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registry.get_type_data::<crate::reflect::ReflectComponent>(type_id)
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{
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reflect_component.map_entities(&mut *component, ctx.entity_mapper());
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}
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drop(registry);
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ctx.write_target_component_reflect(component);
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return;
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}
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}
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// Else, try to clone using ReflectDefault
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if let Some(reflect_default) =
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registry.get_type_data::<bevy_reflect::std_traits::ReflectDefault>(type_id)
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{
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let mut component = reflect_default.default();
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component.apply(source_component_reflect.as_partial_reflect());
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drop(registry);
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ctx.write_target_component_reflect(component);
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return;
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}
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// Otherwise, try to clone using ReflectFromWorld
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if let Some(reflect_from_world) =
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registry.get_type_data::<crate::reflect::ReflectFromWorld>(type_id)
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{
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let reflect_from_world = reflect_from_world.clone();
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let source_component_cloned = source_component_reflect.to_dynamic();
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let component_layout = component_info.layout();
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let target = ctx.target();
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let component_id = ctx.component_id();
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drop(registry);
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ctx.queue_deferred(move |world: &mut World, mapper: &mut dyn EntityMapper| {
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let mut component = reflect_from_world.from_world(world);
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assert_eq!(type_id, (*component).type_id());
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component.apply(source_component_cloned.as_partial_reflect());
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if let Some(reflect_component) = app_registry
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.read()
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.get_type_data::<crate::reflect::ReflectComponent>(type_id)
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{
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reflect_component.map_entities(&mut *component, mapper);
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}
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// SAFETY:
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// - component_id is from the same world as target entity
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// - component is a valid value represented by component_id
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unsafe {
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let raw_component_ptr =
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core::ptr::NonNull::new_unchecked(Box::into_raw(component).cast::<u8>());
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world
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.entity_mut(target)
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.insert_by_id(component_id, OwningPtr::new(raw_component_ptr));
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if component_layout.size() > 0 {
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// Ensure we don't attempt to deallocate zero-sized components
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alloc::alloc::dealloc(raw_component_ptr.as_ptr(), component_layout);
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}
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}
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});
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}
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}
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/// Noop implementation of component clone handler function.
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///
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/// See [`EntityClonerBuilder`](crate::entity::EntityClonerBuilder) for details.
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pub fn component_clone_ignore(_source: &SourceComponent, _ctx: &mut ComponentCloneCtx) {}
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/// Wrapper for components clone specialization using autoderef.
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#[doc(hidden)]
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pub struct DefaultCloneBehaviorSpecialization<T>(PhantomData<T>);
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impl<T> Default for DefaultCloneBehaviorSpecialization<T> {
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fn default() -> Self {
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Self(PhantomData)
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}
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}
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/// Base trait for components clone specialization using autoderef.
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#[doc(hidden)]
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pub trait DefaultCloneBehaviorBase {
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fn default_clone_behavior(&self) -> ComponentCloneBehavior;
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}
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impl<C> DefaultCloneBehaviorBase for DefaultCloneBehaviorSpecialization<C> {
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fn default_clone_behavior(&self) -> ComponentCloneBehavior {
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ComponentCloneBehavior::Default
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}
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}
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/// Specialized trait for components clone specialization using autoderef.
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#[doc(hidden)]
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pub trait DefaultCloneBehaviorViaClone {
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fn default_clone_behavior(&self) -> ComponentCloneBehavior;
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}
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impl<C: Clone + Component> DefaultCloneBehaviorViaClone for &DefaultCloneBehaviorSpecialization<C> {
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fn default_clone_behavior(&self) -> ComponentCloneBehavior {
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ComponentCloneBehavior::clone::<C>()
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}
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}
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@ -1,10 +1,14 @@
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//! Types for declaring and storing [`Component`]s.
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//! Types for declaring and storing [`Component`]s.
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mod clone;
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pub use clone::*;
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use crate::{
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use crate::{
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archetype::ArchetypeFlags,
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archetype::ArchetypeFlags,
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bundle::BundleInfo,
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bundle::BundleInfo,
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change_detection::{MaybeLocation, MAX_CHANGE_AGE},
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change_detection::{MaybeLocation, MAX_CHANGE_AGE},
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entity::{ComponentCloneCtx, Entity, EntityMapper, SourceComponent},
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entity::{Entity, EntityMapper},
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lifecycle::{ComponentHook, ComponentHooks},
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lifecycle::{ComponentHook, ComponentHooks},
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query::DebugCheckedUnwrap,
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query::DebugCheckedUnwrap,
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resource::Resource,
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resource::Resource,
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@ -1035,54 +1039,6 @@ impl ComponentDescriptor {
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}
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}
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}
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}
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/// Function type that can be used to clone an entity.
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pub type ComponentCloneFn = fn(&SourceComponent, &mut ComponentCloneCtx);
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/// The clone behavior to use when cloning a [`Component`].
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#[derive(Clone, Debug, Default, PartialEq, Eq)]
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pub enum ComponentCloneBehavior {
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/// Uses the default behavior (which is passed to [`ComponentCloneBehavior::resolve`])
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#[default]
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Default,
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/// Do not clone this component.
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Ignore,
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/// Uses a custom [`ComponentCloneFn`].
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Custom(ComponentCloneFn),
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}
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impl ComponentCloneBehavior {
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/// Set clone handler based on `Clone` trait.
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///
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/// If set as a handler for a component that is not the same as the one used to create this handler, it will panic.
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pub fn clone<C: Component + Clone>() -> Self {
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Self::Custom(component_clone_via_clone::<C>)
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}
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/// Set clone handler based on `Reflect` trait.
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#[cfg(feature = "bevy_reflect")]
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pub fn reflect() -> Self {
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Self::Custom(component_clone_via_reflect)
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}
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/// Returns the "global default"
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pub fn global_default_fn() -> ComponentCloneFn {
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#[cfg(feature = "bevy_reflect")]
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return component_clone_via_reflect;
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#[cfg(not(feature = "bevy_reflect"))]
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return component_clone_ignore;
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}
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/// Resolves the [`ComponentCloneBehavior`] to a [`ComponentCloneFn`]. If [`ComponentCloneBehavior::Default`] is
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/// specified, the given `default` function will be used.
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pub fn resolve(&self, default: ComponentCloneFn) -> ComponentCloneFn {
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match self {
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ComponentCloneBehavior::Default => default,
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ComponentCloneBehavior::Ignore => component_clone_ignore,
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ComponentCloneBehavior::Custom(custom) => *custom,
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}
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}
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}
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/// A queued component registration.
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/// A queued component registration.
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struct QueuedRegistration {
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struct QueuedRegistration {
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registrator: Box<dyn FnOnce(&mut ComponentsRegistrator, ComponentId, ComponentDescriptor)>,
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registrator: Box<dyn FnOnce(&mut ComponentsRegistrator, ComponentId, ComponentDescriptor)>,
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@ -2885,165 +2841,3 @@ pub fn enforce_no_required_components_recursion(
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}
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}
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}
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}
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}
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}
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/// Component [clone handler function](ComponentCloneFn) implemented using the [`Clone`] trait.
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/// Can be [set](Component::clone_behavior) as clone handler for the specific component it is implemented for.
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/// It will panic if set as handler for any other component.
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///
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pub fn component_clone_via_clone<C: Clone + Component>(
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source: &SourceComponent,
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ctx: &mut ComponentCloneCtx,
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) {
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if let Some(component) = source.read::<C>() {
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ctx.write_target_component(component.clone());
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}
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}
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/// Component [clone handler function](ComponentCloneFn) implemented using reflect.
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/// Can be [set](Component::clone_behavior) as clone handler for any registered component,
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/// but only reflected components will be cloned.
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///
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/// To clone a component using this handler, the following must be true:
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/// - World has [`AppTypeRegistry`](crate::reflect::AppTypeRegistry)
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/// - Component has [`TypeId`]
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/// - Component is registered
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/// - Component has [`ReflectFromPtr`](bevy_reflect::ReflectFromPtr) registered
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/// - Component can be cloned via [`PartialReflect::reflect_clone`] _or_ has one of the following registered: [`ReflectFromReflect`](bevy_reflect::ReflectFromReflect),
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/// [`ReflectDefault`](bevy_reflect::std_traits::ReflectDefault), [`ReflectFromWorld`](crate::reflect::ReflectFromWorld)
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///
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/// If any of the conditions is not satisfied, the component will be skipped.
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///
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/// See [`EntityClonerBuilder`](crate::entity::EntityClonerBuilder) for details.
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///
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/// [`PartialReflect::reflect_clone`]: bevy_reflect::PartialReflect::reflect_clone
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#[cfg(feature = "bevy_reflect")]
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pub fn component_clone_via_reflect(source: &SourceComponent, ctx: &mut ComponentCloneCtx) {
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let Some(app_registry) = ctx.type_registry().cloned() else {
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return;
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};
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let registry = app_registry.read();
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let Some(source_component_reflect) = source.read_reflect(®istry) else {
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return;
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};
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let component_info = ctx.component_info();
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// checked in read_source_component_reflect
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let type_id = component_info.type_id().unwrap();
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// Try to clone using `reflect_clone`
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if let Ok(mut component) = source_component_reflect.reflect_clone() {
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if let Some(reflect_component) =
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registry.get_type_data::<crate::reflect::ReflectComponent>(type_id)
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{
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reflect_component.map_entities(&mut *component, ctx.entity_mapper());
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}
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drop(registry);
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ctx.write_target_component_reflect(component);
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return;
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}
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// Try to clone using ReflectFromReflect
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if let Some(reflect_from_reflect) =
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registry.get_type_data::<bevy_reflect::ReflectFromReflect>(type_id)
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{
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if let Some(mut component) =
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reflect_from_reflect.from_reflect(source_component_reflect.as_partial_reflect())
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{
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if let Some(reflect_component) =
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|
||||||
registry.get_type_data::<crate::reflect::ReflectComponent>(type_id)
|
|
||||||
{
|
|
||||||
reflect_component.map_entities(&mut *component, ctx.entity_mapper());
|
|
||||||
}
|
|
||||||
drop(registry);
|
|
||||||
|
|
||||||
ctx.write_target_component_reflect(component);
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
// Else, try to clone using ReflectDefault
|
|
||||||
if let Some(reflect_default) =
|
|
||||||
registry.get_type_data::<bevy_reflect::std_traits::ReflectDefault>(type_id)
|
|
||||||
{
|
|
||||||
let mut component = reflect_default.default();
|
|
||||||
component.apply(source_component_reflect.as_partial_reflect());
|
|
||||||
drop(registry);
|
|
||||||
ctx.write_target_component_reflect(component);
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
// Otherwise, try to clone using ReflectFromWorld
|
|
||||||
if let Some(reflect_from_world) =
|
|
||||||
registry.get_type_data::<crate::reflect::ReflectFromWorld>(type_id)
|
|
||||||
{
|
|
||||||
let reflect_from_world = reflect_from_world.clone();
|
|
||||||
let source_component_cloned = source_component_reflect.to_dynamic();
|
|
||||||
let component_layout = component_info.layout();
|
|
||||||
let target = ctx.target();
|
|
||||||
let component_id = ctx.component_id();
|
|
||||||
drop(registry);
|
|
||||||
ctx.queue_deferred(move |world: &mut World, mapper: &mut dyn EntityMapper| {
|
|
||||||
let mut component = reflect_from_world.from_world(world);
|
|
||||||
assert_eq!(type_id, (*component).type_id());
|
|
||||||
component.apply(source_component_cloned.as_partial_reflect());
|
|
||||||
if let Some(reflect_component) = app_registry
|
|
||||||
.read()
|
|
||||||
.get_type_data::<crate::reflect::ReflectComponent>(type_id)
|
|
||||||
{
|
|
||||||
reflect_component.map_entities(&mut *component, mapper);
|
|
||||||
}
|
|
||||||
// SAFETY:
|
|
||||||
// - component_id is from the same world as target entity
|
|
||||||
// - component is a valid value represented by component_id
|
|
||||||
unsafe {
|
|
||||||
let raw_component_ptr =
|
|
||||||
core::ptr::NonNull::new_unchecked(Box::into_raw(component).cast::<u8>());
|
|
||||||
world
|
|
||||||
.entity_mut(target)
|
|
||||||
.insert_by_id(component_id, OwningPtr::new(raw_component_ptr));
|
|
||||||
|
|
||||||
if component_layout.size() > 0 {
|
|
||||||
// Ensure we don't attempt to deallocate zero-sized components
|
|
||||||
alloc::alloc::dealloc(raw_component_ptr.as_ptr(), component_layout);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
});
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/// Noop implementation of component clone handler function.
|
|
||||||
///
|
|
||||||
/// See [`EntityClonerBuilder`](crate::entity::EntityClonerBuilder) for details.
|
|
||||||
pub fn component_clone_ignore(_source: &SourceComponent, _ctx: &mut ComponentCloneCtx) {}
|
|
||||||
|
|
||||||
/// Wrapper for components clone specialization using autoderef.
|
|
||||||
#[doc(hidden)]
|
|
||||||
pub struct DefaultCloneBehaviorSpecialization<T>(PhantomData<T>);
|
|
||||||
|
|
||||||
impl<T> Default for DefaultCloneBehaviorSpecialization<T> {
|
|
||||||
fn default() -> Self {
|
|
||||||
Self(PhantomData)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/// Base trait for components clone specialization using autoderef.
|
|
||||||
#[doc(hidden)]
|
|
||||||
pub trait DefaultCloneBehaviorBase {
|
|
||||||
fn default_clone_behavior(&self) -> ComponentCloneBehavior;
|
|
||||||
}
|
|
||||||
|
|
||||||
impl<C> DefaultCloneBehaviorBase for DefaultCloneBehaviorSpecialization<C> {
|
|
||||||
fn default_clone_behavior(&self) -> ComponentCloneBehavior {
|
|
||||||
ComponentCloneBehavior::Default
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/// Specialized trait for components clone specialization using autoderef.
|
|
||||||
#[doc(hidden)]
|
|
||||||
pub trait DefaultCloneBehaviorViaClone {
|
|
||||||
fn default_clone_behavior(&self) -> ComponentCloneBehavior;
|
|
||||||
}
|
|
||||||
|
|
||||||
impl<C: Clone + Component> DefaultCloneBehaviorViaClone for &DefaultCloneBehaviorSpecialization<C> {
|
|
||||||
fn default_clone_behavior(&self) -> ComponentCloneBehavior {
|
|
||||||
ComponentCloneBehavior::clone::<C>()
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user