Bevy's fixed update is throttled by rendering, but it doesn´t have to be!
This crate allows you to run a fixed update in a background task, so you can improve your time budget.
multi_threaded feature. Otherwise, this just adds unnecessary overhead.
It's quite similar to how bevy's fixed update works, but eagerly extracts ECS data into a background task, to synchronize it only when Time<Virtual> catches back to the "simulated time".
The implementation doesn't use Time<Fixed> but a component approach TimeStep, SubstepCount, TaskToRender.
By relying on scheduling for extracting data and writing back, it's easier to order systems correctly when using other ecosystem crates such as bevy_transform_interpolation.
mermaid
Unfortunately mermaid has a few bugs and github doesn't rely on latest mermaid, you can paste that is https://mermaid.live for a better formatting:
gantt
title Background fixed update
dateFormat X
axisFormat %L
section Frames
Frame 1 :f1, 0, 0.16s
Frame 2 :f2,after f1, 0.16s
Frame 3 :f3,after f2, 0.16s
section Bevy ecs
Start a fixed update :s1, 0, 0.001s
Extract data :after s1, 0.01s
Should we finish the fixed update? :c1,after f1, 0.001s
Should we finish the fixed update? :c2,after f2, 0.001s
Write back data :w1,after c2, 0.01s
Start a new fixed update :s2,after w1, 0.001s
Extract data :e2,after s2, 0.01s
section Background thread
Background task :after e1, 0.25s
Background task :after e2, 0.25s