Bevy Rhythm (thin router)
Thin genre router. Not a full port. Godot counterpart: godot-genre-rhythm. Ideas only. Domain work stays on the Bevy skills below.
When to use
Load this for chart time and hit windows aligned to audio.
ECS shape
- Components hold the genre's per-entity flags as plain data. This file does not name new engine types.
- Resources hold run-wide counters (score, wave index, seed) via bevy-data-resources.
- Systems read those components on
Updateor the fixed timestep from bevy-master. Order them with.chain()when a later system must see the result. - Schedule: gameplay mode changes go through bevy-state-machines. Do not invent a genre plugin.
Godot idea to Bevy idiom
| Idea | Bevy idiom (idea only) |
|---|---|
| Genre scene tree | Entities plus the domain skills linked below |
| Autoload director | A resource, not a singleton node |
| Signal bus for the loop | bevy-events-messaging |
Routing
- bevy-audio-systems - Music playback.
- bevy-input-handling - Hits.
- bevy-game-loop-time-trial - Score time.
Gaps
- No chart, beat, or latency-calibration type was opened.
- Audio DSP timing was not opened.
Expert Knowledge Delta
Library target in prose: Bevy 0.20.0. Lattice URLs stay unversioned.
Opened canon only: Component, Resource, Query, Commands, Startup, Update, Fixed / FixedMain (bevy::time), .chain(), Plugin, DefaultPlugins, MinimalPlugins. Messages and observers are an ownership slot. This file does not invent their struct APIs. Systems run in parallel unless .chain() orders the ones that conflict.
Who owns state
| Piece | Owner | Who may mutate | Schedule |
|---|---|---|---|
| Data on one entity | Component | One system via Query | Update or FixedMain |
| One value for the whole app | Resource | One system | Startup to insert, then the schedule that reads it |
| Spawn | Commands | The spawning system | Startup for the initial world; later schedules for runtime spawn |
| Order that must not race | .chain() | The chained systems only | Same schedule |
| Plugin boundary | Plugin | build registers systems and resources | Before the app runs |
Borrow rule: two systems that both mutably query the same component must be ordered (.chain()) or split so only one writes. Unrelated systems stay parallel. That is the ECS page rule, not a guess at a system-set API.
Decision
| If you need | Do this | Do not |
|---|---|---|
| Per-entity data | Component + Query | A Godot node script |
| App-wide config or clock | Resource | Copy the value onto every entity |
| Stable simulation step | FixedMain and the Fixed clock | Tie simulation to raw frame Update |
| Startup spawn | Commands in Startup | Spawn from a render system |
| Cross-system notice that is not shared state | Message or observer slot in bevy-events-messaging | A new event type invented in this file |
| An API this skill did not open | A Gaps row | A fabricated crate (solver, navmesh module, net, XR) |
Load references/a-gate-notes.md for the same table plus the gap rule.
NEVER
-
Do not put
/0.20.0/in lattice URLs. WHY: permalinks stay onlatest. The 0.20.0 pin belongs in prose once. -
Do not mutably query the same component from two unordered systems. WHY: the schedule runs systems in parallel unless
.chain()orders them. -
Do not invent a physics, navigation, networking, or XR crate here. WHY: those rows are gaps, blocked, or revisit.
-
No Godot types in Bevy code. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar.
-
No invented genre APIs. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar.
-
No Creation Station content. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar.
-
No umbrella skill over Godot and Bevy. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar.
-
Do not mark this row
ported. It isdocs_mapped. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar. -
Do not pick a physics or net crate here. WHY: a Godot port, an unopened API, or a public lie fails the docs-first bar.
Reference
docs.rs links use the unversioned latest permalink. The library pin on bevy-master stays 0.20.0.
Official Documentation
- Migration guides - Unversioned hop index.
- bevy crate - Unversioned API index. Feature list opened for 0.20.0.
- Assets - Official asset catalog. No third-party crate was selected.
- Examples - Example tree on the
latestbranch. - ECS -
Component, systems,Query,Startup,Update, and.chain(). - Plugins -
Plugin,DefaultPlugins,MinimalPlugins, andadd_plugins.
Related Skills
Prerequisites
- bevy-master - ECS ownership and schedules.
- bevy-ecs-composition - Spawn and query shape.
Complements
- godot-genre-rhythm - Godot counterpart. Source idea only.
- bevy-audio-systems - Music playback.
- bevy-input-handling - Hits.
- bevy-game-loop-time-trial - Score time.
Downstream / consumers
- None. This router does not own a second implementation.
Master
- bevy-master - Bevy router.


