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James Liu 6d547d7ce6
Allow Mesh-related queue phase systems to parallelize (#11804) 
# Objective
Partially addresses #3548. `queue_shadows` and `queue_material_meshes`
cannot parallelize because of the `ResMut<RenderMeshInstances>`
parameter for `queue_material_meshes`.

## Solution
Change the `material_bind_group` field to use atomics instead of needing
full mutable access. Change the `ResMut` to a `Res`, which should allow
both sets of systems to parallelize without issue.

## Performance
Tested against `many_foxes`, this has a significant improvement over the
entire render schedule. (Yellow is this PR, red is main)

![image](https://github.com/bevyengine/bevy/assets/3137680/6cc7f346-4f50-4f12-a383-682a9ce1daf6)

The use of atomics does seem to have a negative effect on
`queue_material_meshes` (roughly a 8.29% increase in time spent in the
system).

![image](https://github.com/bevyengine/bevy/assets/3137680/7907079a-863d-4760-aa5b-df68c006ea36)

`queue_shadows` seems to be ever so slightly slower (1.6% more time
spent) in the system.

![image](https://github.com/bevyengine/bevy/assets/3137680/6d90af73-b922-45e4-bae5-df200e8b9784)

`batch_and_prepare_render_phase` seems to be a mix, but overall seems to
be slightly *faster* by about 5%.

![image](https://github.com/bevyengine/bevy/assets/3137680/fac638ff-8c90-436b-9362-c6209b18957c)
2024-02-20 00:12:41 +00:00
..
src Allow Mesh-related queue phase systems to parallelize (#11804) 2024-02-20 00:12:41 +00:00
Cargo.toml Release 0.13.0 (#11920) 2024-02-17 09:24:25 +00:00