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Merge pull request #23 from ten3roberts/relations_like_mut
Add relations_like_mut
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| use core::{ | ||
| fmt::{self, Formatter}, | ||
| slice, | ||
| }; | ||
|
|
||
| use alloc::vec::Vec; | ||
| use smallvec::SmallVec; | ||
|
|
||
| use crate::{ | ||
| archetype::{Archetype, CellMutGuard, Slice, Slot}, | ||
| component::ComponentValue, | ||
| relation::Relation, | ||
| system::{Access, AccessKind}, | ||
| util::PtrMut, | ||
| Entity, Fetch, FetchItem, RelationExt, | ||
| }; | ||
|
|
||
| use super::{FetchAccessData, FetchPrepareData, PreparedFetch}; | ||
|
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| /// Returns an iterator of all relations of the specified type | ||
| #[derive(Debug, Clone)] | ||
| pub struct RelationsMut<T: ComponentValue> { | ||
| relation: Relation<T>, | ||
| } | ||
|
|
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| impl<'w, T> Fetch<'w> for RelationsMut<T> | ||
| where | ||
| T: ComponentValue, | ||
| { | ||
| const MUTABLE: bool = false; | ||
|
|
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| type Prepared = PreparedRelationsMut<'w, T>; | ||
|
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| fn prepare(&self, data: FetchPrepareData<'w>) -> Option<Self::Prepared> { | ||
| let borrows: SmallVec<[_; 4]> = { | ||
| data.arch | ||
| .relations_like(self.relation.id()) | ||
| .map(|(desc, &cell_index)| { | ||
| ( | ||
| desc.target.unwrap(), | ||
| data.arch.cells()[cell_index].borrow_mut(), | ||
| ) | ||
| }) | ||
| .collect() | ||
| }; | ||
|
|
||
| Some(PreparedRelationsMut { | ||
| borrows, | ||
| arch: data.arch, | ||
| tick: data.new_tick, | ||
| }) | ||
| } | ||
|
|
||
| fn filter_arch(&self, _: FetchAccessData) -> bool { | ||
| true | ||
| } | ||
|
|
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| fn access(&self, data: FetchAccessData, dst: &mut Vec<Access>) { | ||
| let relation = self.relation.id(); | ||
| let val = data.arch.relations_like(relation).map(|v| Access { | ||
| kind: AccessKind::Archetype { | ||
| id: data.arch_id, | ||
| component: *v.0, | ||
| }, | ||
| mutable: true, | ||
| }); | ||
|
|
||
| dst.extend(val); | ||
| } | ||
|
|
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| fn describe(&self, f: &mut Formatter) -> fmt::Result { | ||
| write!(f, "relations({})", self.relation) | ||
| } | ||
| } | ||
|
|
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| impl<'q, T: ComponentValue> FetchItem<'q> for RelationsMut<T> { | ||
| type Item = RelationsIterMut<'q, T>; | ||
| } | ||
|
|
||
| #[doc(hidden)] | ||
| pub struct PreparedRelationsMut<'a, T> { | ||
| borrows: SmallVec<[(Entity, CellMutGuard<'a, [T]>); 4]>, | ||
| arch: &'a Archetype, | ||
| tick: u32, | ||
| } | ||
|
|
||
| pub struct Batch<'a, T> { | ||
| borrows: PtrMut<'a, (Entity, CellMutGuard<'a, [T]>)>, | ||
| borrow_count: usize, | ||
| slot: Slot, | ||
| } | ||
|
|
||
| impl<'w, 'q, T> PreparedFetch<'q> for PreparedRelationsMut<'w, T> | ||
| where | ||
| T: 'q + ComponentValue, | ||
| { | ||
| type Item = RelationsIterMut<'q, T>; | ||
|
|
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| type Chunk = Batch<'q, T>; | ||
|
|
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| const HAS_FILTER: bool = false; | ||
|
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| unsafe fn create_chunk(&'q mut self, slots: Slice) -> Self::Chunk { | ||
| for (_target, borrow) in &mut self.borrows { | ||
| borrow.set_modified(&self.arch.entities[slots.as_range()], slots, self.tick) | ||
| } | ||
|
|
||
| Batch { | ||
| borrow_count: self.borrows.len(), | ||
| borrows: PtrMut::new(self.borrows.as_mut_ptr() as _), | ||
| slot: slots.start, | ||
| } | ||
| } | ||
|
|
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| unsafe fn fetch_next(chunk: &mut Self::Chunk) -> Self::Item { | ||
| let slot = chunk.slot; | ||
| chunk.slot += 1; | ||
|
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| RelationsIterMut { | ||
| borrows: slice::from_raw_parts_mut(chunk.borrows.as_ptr() as _, chunk.borrow_count) | ||
| .iter_mut(), | ||
| slot, | ||
| } | ||
| } | ||
| } | ||
|
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| /// Iterates the relation targets and data for the yielded query item | ||
| pub struct RelationsIterMut<'a, T> { | ||
| borrows: slice::IterMut<'a, (Entity, CellMutGuard<'a, [T]>)>, | ||
| slot: Slot, | ||
| } | ||
|
|
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| impl<'a, T> Iterator for RelationsIterMut<'a, T> { | ||
| type Item = (Entity, &'a mut T); | ||
|
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| fn next(&mut self) -> Option<Self::Item> { | ||
| let (id, borrow) = self.borrows.next()?; | ||
| let borrow = &mut borrow.get_mut()[self.slot]; | ||
| Some((*id, borrow)) | ||
| } | ||
| } | ||
|
|
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| /// Access all relations of the specified type on the entity. | ||
| /// | ||
| /// See: [`relations`](crate::fetch::relations::relations_like) | ||
| pub fn relations_like_mut<T: ComponentValue>(relation: impl RelationExt<T>) -> RelationsMut<T> { | ||
| RelationsMut { | ||
| relation: relation.as_relation(), | ||
| } | ||
| } |
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