mirror of
https://github.com/bevyengine/bevy
synced 2024-11-22 20:53:53 +00:00
ecs: move copy of QueryBorrow into bevy_ecs and fix perf regressions
This commit is contained in:
parent
77f4e60c8c
commit
64cc382477
4 changed files with 322 additions and 96 deletions
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@ -40,7 +40,8 @@ pub struct World {
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entities: Entities,
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index: HashMap<Vec<TypeId>, u32>,
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removed_components: HashMap<TypeId, Vec<Entity>>,
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archetypes: Vec<Archetype>,
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#[allow(missing_docs)]
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pub archetypes: Vec<Archetype>,
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archetype_generation: u64,
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}
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@ -1,12 +1,10 @@
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pub use super::Query;
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use super::TypeAccess;
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use crate::{
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resource::{FetchResource, ResourceQuery, Resources, UnsafeClone},
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system::{ArchetypeAccess, Commands, System, SystemId, ThreadLocalExecution},
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};
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use core::marker::PhantomData;
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use hecs::{
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Component, ComponentError, Entity, Fetch, Query as HecsQuery, QueryBorrow, Ref, RefMut, World,
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};
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use hecs::{Fetch, Query as HecsQuery, World};
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use std::borrow::Cow;
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pub struct SystemFn<State, F, ThreadLocalF, Init, SetArchetypeAccess>
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@ -133,92 +131,6 @@ macro_rules! impl_into_foreach_system {
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};
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}
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pub struct Query<'a, Q: HecsQuery> {
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world: &'a World,
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archetype_access: &'a ArchetypeAccess,
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_marker: PhantomData<Q>,
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}
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#[derive(Debug)]
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pub enum QueryComponentError {
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CannotReadArchetype,
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CannotWriteArchetype,
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ComponentError(ComponentError),
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}
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impl<'a, Q: HecsQuery> Query<'a, Q> {
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pub fn iter(&mut self) -> QueryBorrow<'_, Q> {
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self.world.query::<Q>()
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}
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/// Gets a reference to the entity's component of the given type. This will fail if the entity does not have
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/// the given component type or if the given component type does not match this query.
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pub fn get<T: Component>(&self, entity: Entity) -> Result<Ref<'_, T>, QueryComponentError> {
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if let Some(location) = self.world.get_entity_location(entity) {
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if self
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.archetype_access
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.immutable
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.contains(location.archetype as usize)
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|| self
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.archetype_access
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.mutable
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.contains(location.archetype as usize)
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{
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self.world
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.get(entity)
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.map_err(|err| QueryComponentError::ComponentError(err))
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} else {
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Err(QueryComponentError::CannotReadArchetype)
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}
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} else {
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Err(QueryComponentError::ComponentError(
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ComponentError::NoSuchEntity,
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))
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}
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}
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/// Gets a mutable reference to the entity's component of the given type. This will fail if the entity does not have
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/// the given component type or if the given component type does not match this query.
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pub fn get_mut<T: Component>(
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&self,
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entity: Entity,
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) -> Result<RefMut<'_, T>, QueryComponentError> {
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if let Some(location) = self.world.get_entity_location(entity) {
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if self
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.archetype_access
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.mutable
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.contains(location.archetype as usize)
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{
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self.world
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.get_mut(entity)
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.map_err(|err| QueryComponentError::ComponentError(err))
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} else {
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Err(QueryComponentError::CannotWriteArchetype)
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}
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} else {
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Err(QueryComponentError::ComponentError(
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ComponentError::NoSuchEntity,
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))
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}
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}
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pub fn removed<C: Component>(&self) -> &[Entity] {
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self.world.removed::<C>()
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}
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/// Sets the entity's component to the given value. This will fail if the entity does not already have
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/// the given component type or if the given component type does not match this query.
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pub fn set<T: Component>(
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&self,
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entity: Entity,
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component: T,
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) -> Result<(), QueryComponentError> {
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let mut current = self.get_mut::<T>(entity)?;
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*current = component;
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Ok(())
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}
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}
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struct QuerySystemState {
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archetype_accesses: Vec<ArchetypeAccess>,
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commands: Commands,
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@ -265,11 +177,7 @@ macro_rules! impl_into_query_system {
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let ($($resource,)*) = resources.query_system::<($($resource,)*)>(id);
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let mut i = 0;
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$(
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let $query = Query::<$query> {
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world,
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archetype_access: &state.archetype_accesses[i],
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_marker: PhantomData::default(),
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};
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let $query = Query::<$query>::new(world, &state.archetype_accesses[i]);
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i += 1;
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)*
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@ -3,9 +3,11 @@ mod into_system;
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#[cfg(feature = "profiler")]
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mod profiler;
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mod system;
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mod query;
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pub use commands::*;
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pub use into_system::*;
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#[cfg(feature = "profiler")]
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pub use profiler::*;
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pub use system::*;
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pub use query::*;
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315
crates/bevy_ecs/src/system/query.rs
Normal file
315
crates/bevy_ecs/src/system/query.rs
Normal file
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@ -0,0 +1,315 @@
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use hecs::{
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Component, ComponentError, Entity, Query as HecsQuery, Ref, RefMut, World, Archetype, Access, Without, With, Fetch,
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};
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use std::marker::PhantomData;
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use crate::ArchetypeAccess;
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pub struct Query<'a, Q: HecsQuery> {
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pub(crate) world: &'a World,
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pub(crate) archetype_access: &'a ArchetypeAccess,
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_marker: PhantomData<Q>,
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}
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#[derive(Debug)]
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pub enum QueryComponentError {
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CannotReadArchetype,
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CannotWriteArchetype,
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ComponentError(ComponentError),
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}
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impl<'a, Q: HecsQuery> Query<'a, Q> {
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#[inline]
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pub fn new(world: &'a World, archetype_access: &'a ArchetypeAccess) -> Self {
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Self {
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world,
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archetype_access,
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_marker: PhantomData::default()
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}
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}
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#[inline]
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pub fn iter(&mut self) -> QueryBorrow<'_, Q> {
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QueryBorrow::new(&self.world.archetypes)
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}
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/// Gets a reference to the entity's component of the given type. This will fail if the entity does not have
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/// the given component type or if the given component type does not match this query.
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pub fn get<T: Component>(&self, entity: Entity) -> Result<Ref<'_, T>, QueryComponentError> {
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if let Some(location) = self.world.get_entity_location(entity) {
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if self
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.archetype_access
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.immutable
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.contains(location.archetype as usize)
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|| self
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.archetype_access
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.mutable
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.contains(location.archetype as usize)
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{
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self.world
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.get(entity)
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.map_err(|err| QueryComponentError::ComponentError(err))
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} else {
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Err(QueryComponentError::CannotReadArchetype)
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}
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} else {
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Err(QueryComponentError::ComponentError(
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ComponentError::NoSuchEntity,
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))
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}
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}
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/// Gets a mutable reference to the entity's component of the given type. This will fail if the entity does not have
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/// the given component type or if the given component type does not match this query.
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pub fn get_mut<T: Component>(
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&self,
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entity: Entity,
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) -> Result<RefMut<'_, T>, QueryComponentError> {
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if let Some(location) = self.world.get_entity_location(entity) {
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if self
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.archetype_access
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.mutable
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.contains(location.archetype as usize)
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{
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self.world
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.get_mut(entity)
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.map_err(|err| QueryComponentError::ComponentError(err))
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} else {
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Err(QueryComponentError::CannotWriteArchetype)
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}
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} else {
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Err(QueryComponentError::ComponentError(
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ComponentError::NoSuchEntity,
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))
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}
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}
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pub fn removed<C: Component>(&self) -> &[Entity] {
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self.world.removed::<C>()
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}
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/// Sets the entity's component to the given value. This will fail if the entity does not already have
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/// the given component type or if the given component type does not match this query.
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pub fn set<T: Component>(
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&self,
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entity: Entity,
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component: T,
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) -> Result<(), QueryComponentError> {
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let mut current = self.get_mut::<T>(entity)?;
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*current = component;
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Ok(())
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}
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}
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/// A borrow of a `World` sufficient to execute the query `Q`
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///
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/// Note that borrows are not released until this object is dropped.
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pub struct QueryBorrow<'w, Q: HecsQuery> {
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archetypes: &'w [Archetype],
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borrowed: bool,
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_marker: PhantomData<Q>,
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}
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impl<'w, Q: HecsQuery> QueryBorrow<'w, Q> {
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pub(crate) fn new(archetypes: &'w [Archetype]) -> Self {
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Self {
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archetypes,
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borrowed: false,
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_marker: PhantomData,
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}
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}
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/// Execute the query
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///
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/// Must be called only once per query.
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#[inline]
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pub fn iter<'q>(&'q mut self) -> QueryIter<'q, 'w, Q> {
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self.borrow();
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QueryIter {
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borrow: self,
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archetype_index: 0,
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iter: None,
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}
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}
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fn borrow(&mut self) {
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if self.borrowed {
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panic!(
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"called QueryBorrow::iter twice on the same borrow; construct a new query instead"
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);
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}
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for x in self.archetypes {
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// TODO: Release prior borrows on failure?
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if Q::Fetch::access(x) >= Some(Access::Read) {
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Q::Fetch::borrow(x);
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}
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}
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self.borrowed = true;
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}
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/// Transform the query into one that requires a certain component without borrowing it
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///
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/// This can be useful when the component needs to be borrowed elsewhere and it isn't necessary
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/// for the iterator to expose its data directly.
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///
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/// Equivalent to using a query type wrapped in `With`.
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///
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/// # Example
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/// ```
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/// # use hecs::*;
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/// let mut world = World::new();
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/// let a = world.spawn((123, true, "abc"));
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/// let b = world.spawn((456, false));
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/// let c = world.spawn((42, "def"));
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/// let entities = world.query::<(Entity, &i32)>()
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/// .with::<bool>()
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/// .iter()
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/// .map(|(e, &i)| (e, i)) // Copy out of the world
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/// .collect::<Vec<_>>();
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/// assert!(entities.contains(&(a, 123)));
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/// assert!(entities.contains(&(b, 456)));
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/// ```
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pub fn with<T: Component>(self) -> QueryBorrow<'w, With<T, Q>> {
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self.transform()
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}
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/// Transform the query into one that skips entities having a certain component
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///
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/// Equivalent to using a query type wrapped in `Without`.
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///
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/// # Example
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/// ```
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/// # use hecs::*;
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/// let mut world = World::new();
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/// let a = world.spawn((123, true, "abc"));
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/// let b = world.spawn((456, false));
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/// let c = world.spawn((42, "def"));
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/// let entities = world.query::<(Entity, &i32)>()
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/// .without::<bool>()
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/// .iter()
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/// .map(|(e, &i)| (e, i)) // Copy out of the world
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/// .collect::<Vec<_>>();
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/// assert_eq!(entities, &[(c, 42)]);
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/// ```
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pub fn without<T: Component>(self) -> QueryBorrow<'w, Without<T, Q>> {
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self.transform()
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}
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/// Helper to change the type of the query
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fn transform<R: HecsQuery>(mut self) -> QueryBorrow<'w, R> {
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let x = QueryBorrow {
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archetypes: self.archetypes,
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borrowed: self.borrowed,
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_marker: PhantomData,
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};
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// Ensure `Drop` won't fire redundantly
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self.borrowed = false;
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x
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}
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}
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unsafe impl<'w, Q: HecsQuery> Send for QueryBorrow<'w, Q> {}
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unsafe impl<'w, Q: HecsQuery> Sync for QueryBorrow<'w, Q> {}
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impl<'w, Q: HecsQuery> Drop for QueryBorrow<'w, Q> {
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fn drop(&mut self) {
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if self.borrowed {
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for x in self.archetypes {
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if Q::Fetch::access(x) >= Some(Access::Read) {
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Q::Fetch::release(x);
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}
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}
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}
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}
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}
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impl<'q, 'w, Q: HecsQuery> IntoIterator for &'q mut QueryBorrow<'w, Q> {
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type IntoIter = QueryIter<'q, 'w, Q>;
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type Item = <Q::Fetch as Fetch<'q>>::Item;
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#[inline]
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fn into_iter(self) -> Self::IntoIter {
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self.iter()
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}
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}
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/// Iterator over the set of entities with the components in `Q`
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pub struct QueryIter<'q, 'w, Q: HecsQuery> {
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borrow: &'q mut QueryBorrow<'w, Q>,
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archetype_index: u32,
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iter: Option<ChunkIter<Q>>,
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}
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unsafe impl<'q, 'w, Q: HecsQuery> Send for QueryIter<'q, 'w, Q> {}
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unsafe impl<'q, 'w, Q: HecsQuery> Sync for QueryIter<'q, 'w, Q> {}
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impl<'q, 'w, Q: HecsQuery> Iterator for QueryIter<'q, 'w, Q> {
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type Item = <Q::Fetch as Fetch<'q>>::Item;
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#[inline]
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fn next(&mut self) -> Option<Self::Item> {
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loop {
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match self.iter {
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None => {
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let archetype = self.borrow.archetypes.get(self.archetype_index as usize)?;
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self.archetype_index += 1;
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unsafe {
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self.iter = Q::Fetch::get(archetype, 0).map(|fetch| ChunkIter {
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fetch,
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len: archetype.len(),
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});
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}
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}
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Some(ref mut iter) => match unsafe { iter.next() } {
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None => {
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self.iter = None;
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continue;
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}
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Some(components) => {
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return Some(components);
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}
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},
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}
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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let n = self.len();
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(n, Some(n))
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}
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}
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impl<'q, 'w, Q: HecsQuery> ExactSizeIterator for QueryIter<'q, 'w, Q> {
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fn len(&self) -> usize {
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self.borrow
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.archetypes
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.iter()
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.filter(|&x| Q::Fetch::access(x).is_some())
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.map(|x| x.len() as usize)
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.sum()
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}
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}
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struct ChunkIter<Q: HecsQuery> {
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fetch: Q::Fetch,
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len: u32,
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}
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impl<Q: HecsQuery> ChunkIter<Q> {
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#[inline]
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unsafe fn next<'a, 'w>(&mut self) -> Option<<Q::Fetch as Fetch<'a>>::Item> {
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loop {
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if self.len == 0 {
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return None;
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}
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self.len -= 1;
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if self.fetch.should_skip() {
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// we still need to progress the iterator
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let _ = self.fetch.next();
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continue;
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}
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break Some(self.fetch.next());
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}
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}
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}
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