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Copy pathbatch.rs
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144 lines (126 loc) · 4.28 KB
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use crate::alloc::collections::BinaryHeap;
use core::{any::TypeId, fmt, mem::MaybeUninit, slice};
use crate::{
archetype::{TypeIdMap, TypeInfo},
Archetype, Component,
};
/// A collection of component types
#[derive(Debug, Clone, Default)]
pub struct ColumnBatchType {
types: BinaryHeap<TypeInfo>,
}
impl ColumnBatchType {
/// Create an empty type
pub fn new() -> Self {
Self::default()
}
/// Update to include `T` components
pub fn add<T: Component>(&mut self) -> &mut Self {
self.types.push(TypeInfo::of::<T>());
self
}
/// Construct a [`ColumnBatchBuilder`] for *exactly* `size` entities with these components
pub fn into_batch(self, size: u32) -> ColumnBatchBuilder {
let mut types = self.types.into_sorted_vec();
types.dedup();
let fill = TypeIdMap::with_capacity_and_hasher(types.len(), Default::default());
let mut arch = Archetype::new(types);
arch.reserve(size);
ColumnBatchBuilder {
fill,
archetype: Some(arch),
}
}
}
/// An incomplete collection of component data for entities with the same component types
pub struct ColumnBatchBuilder {
/// Number of components written so far for each component type
fill: TypeIdMap<u32>,
pub(crate) archetype: Option<Archetype>,
}
unsafe impl Send for ColumnBatchBuilder {}
unsafe impl Sync for ColumnBatchBuilder {}
impl ColumnBatchBuilder {
/// Create a batch for *exactly* `size` entities with certain component types
pub fn new(ty: ColumnBatchType, size: u32) -> Self {
ty.into_batch(size)
}
/// Get a handle for inserting `T` components if `T` was in the [`ColumnBatchType`]
pub fn writer<T: Component>(&mut self) -> Option<BatchWriter<'_, T>> {
let archetype = self.archetype.as_mut().unwrap();
let base = archetype.get_base::<T>()?;
Some(BatchWriter {
fill: self.fill.entry(TypeId::of::<T>()).or_insert(0),
storage: unsafe {
slice::from_raw_parts_mut(base.as_ptr().cast(), archetype.capacity() as usize)
.iter_mut()
},
})
}
/// Finish the batch, failing if any components are missing
pub fn build(mut self) -> Result<ColumnBatch, BatchIncomplete> {
let mut archetype = self.archetype.take().unwrap();
if archetype
.types()
.iter()
.any(|ty| self.fill.get(&ty.id()).copied().unwrap_or(0) != archetype.capacity())
{
return Err(BatchIncomplete { _opaque: () });
}
unsafe {
archetype.set_len(archetype.capacity());
}
Ok(ColumnBatch(archetype))
}
}
impl Drop for ColumnBatchBuilder {
fn drop(&mut self) {
if let Some(archetype) = self.archetype.take() {
for ty in archetype.types() {
let fill = self.fill.get(&ty.id()).copied().unwrap_or(0);
unsafe {
let base = archetype.get_dynamic(ty.id(), 0, 0).unwrap();
for i in 0..fill {
base.as_ptr().add(i as usize).drop_in_place()
}
}
}
}
}
}
/// A collection of component data for entities with the same component types
pub struct ColumnBatch(pub(crate) Archetype);
/// Handle for appending components
pub struct BatchWriter<'a, T> {
fill: &'a mut u32,
storage: core::slice::IterMut<'a, MaybeUninit<T>>,
}
impl<T> BatchWriter<'_, T> {
/// Add a component if there's space remaining
pub fn push(&mut self, x: T) -> Result<(), T> {
match self.storage.next() {
None => Err(x),
Some(slot) => {
*slot = MaybeUninit::new(x);
*self.fill += 1;
Ok(())
}
}
}
/// How many components have been added so far
pub fn fill(&self) -> u32 {
*self.fill
}
}
/// Error indicating that a `ColumnBatchBuilder` was missing components
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct BatchIncomplete {
_opaque: (),
}
#[cfg(feature = "std")]
impl std::error::Error for BatchIncomplete {}
impl fmt::Display for BatchIncomplete {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("batch incomplete")
}
}