bevy/crates/bevy_scene
James Liu fe7ebd4326 Clean up Fetch code (#4800)
# Objective
Clean up code surrounding fetch by pulling out the common parts into the iteration code.

## Solution
Merge `Fetch::table_fetch` and `Fetch::archetype_fetch` into a single API: `Fetch::fetch(&mut self, entity: &Entity, table_row: &usize)`. This provides everything any fetch requires to internally decide which storage to read from and get the underlying data. All of these functions are marked as `#[inline(always)]` and the arguments are passed as references to attempt to optimize out the argument that isn't being used.

External to `Fetch`, Query iteration has been changed to keep track of the table row and entity outside of fetch, which moves a lot of the expensive bookkeeping `Fetch` structs had previously done internally into the outer loop.

~~TODO: Benchmark, docs~~ Done.

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## Changelog
Changed: `Fetch::table_fetch` and `Fetch::archetype_fetch` have been merged into a single `Fetch::fetch` function.

## Migration Guide
TODO

Co-authored-by: Brian Merchant <bhmerchang@gmail.com>
Co-authored-by: Saverio Miroddi <saverio.pub2@gmail.com>
2022-10-28 09:25:50 +00:00
..
src Clean up Fetch code (#4800) 2022-10-28 09:25:50 +00:00
Cargo.toml Update to ron 0.8 (#5864) 2022-09-02 14:20:49 +00:00