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refactor(M03): extract M2 animation playback

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# M2 Animation Playback Controller
## Metadata
| Field | Value |
|---|---|
| Status | Implemented extraction |
| Target/work package | M03 / `M03-RND-M2-ANIMATION-PLAYBACK-001` |
| Owners | Per-instance AnimationPlayer/native animator playback mutation |
| Last verified | Worktree `work/sindo-main-codex/m03-m2-animation-playback`, 2026-07-18 |
| Profiles/capabilities | Imported GLB and native experimental animated M2 instances |
## Purpose
Apply deterministic playback to one already duplicated M2 instance: copy native
animator runtime fields, derive a stable phase, prepare/phase native animators,
select an imported animation and configure linear looping/playback/seek.
## Non-goals
- Duplicate, name, transform or attach instances/batch roots.
- Apply visibility, shadows or Editor ownership.
- Load/finalize/cache animated scenes or decide eligibility.
- Change animation priorities, phase formula or native animator implementation.
## Context and boundaries
```mermaid
flowchart LR
Prototype[Animated prototype] --> Loader[StreamingWorldLoader materializer]
Loader -->|source and duplicate| Playback[M2AnimationPlaybackController]
Finalizer[M2AnimatedSceneFinalizer player inventory] --> Playback
Playback --> Native[M2NativeAnimator mutation]
Playback --> Imported[AnimationPlayer mutation]
```
Allowed dependencies are supplied Nodes, Script identity, AnimationPlayer and
Animation resources. ResourceLoader, files, workers, caches, scheduler,
MultiMesh, SceneTree attachment and application layers are forbidden.
## Public API
| Symbol | Kind | Purpose | Thread/lifetime | Errors |
|---|---|---|---|---|
| `copy_native_animator_data(source_root, target_root, script)` | Command | Copy five runtime fields in depth-first pair order | Main thread; borrowed nodes | Null/script mismatch yields no pairs |
| `start_instance_playback(root, path, index, script, players, collect_diagnostics)` | Command/query | Start native/imported playback and optionally return native state | Main thread; one instance | Null/empty inventories no-op |
| `native_animators_in_subtree(root, script)` | Query | Exact-script depth-first inventory | Main thread; borrowed nodes | Null root/script returns empty |
| `phase_for_instance(path, index)` | Pure query | Stable phase in `[0, 1)` | Any thread; scalar | Historical hash behavior retained |
| `choose_default_animation(player, path)` | Pure engine query | Apply exact ordinary/fish/bird/fallback priority | Main thread; borrowed player | Null/no animations returns empty |
## Inputs and outputs
| Direction | Contract/data | Producer | Consumer | Ownership | Thread/lifetime |
|---|---|---|---|---|---|
| Input | Prototype and duplicate subtrees | Loader materializer | Native field copy | Borrowed Nodes | One duplicate |
| Input | Exact native animator Script | Loader composition | Native inventory | Borrowed Script | Call-local |
| Input | Relative path and instance index | Build batch adapter | Phase/selection | Copied values | One start |
| Input | AnimationPlayer inventory | Animated scene finalizer traversal | Imported playback | Borrowed players | One start |
| Output | Mutated native/imported playback | Controller | Rendered instance | Nodes retain state/resources | Instance lifetime |
| Output | Detached native diagnostic records | Controller | Loader log adapter | Caller-owned Dictionaries | Debug call |
Side effects are native field assignment, prepare/phase calls, animation loop
mutation, play and seek. The service retains no inputs.
## Data flow
```mermaid
flowchart TD
Identity[Path and index] --> Phase[Stable hash phase]
NativeInventory[Exact-script native inventory] --> Prepare[prepare runtime if available]
Phase --> NativePhase[set native phase]
Players[AnimationPlayers] --> Select[Choose path-specific default]
Select --> Loop[Set every animation LOOP_LINEAR]
Loop --> Play[Play selected name]
Phase --> Seek[Seek positive-length selection]
NativePhase --> Diagnostics{Debug requested?}
Diagnostics -->|yes| Snapshot[Detached runtime state]
```
## Lifecycle/state
```mermaid
stateDiagram-v2
[*] --> Unstarted
Unstarted --> Prepared: copy native data and start
Prepared --> Playing: native phase and/or AnimationPlayer play
Playing --> Playing: repeated deterministic start
Playing --> [*]: instance owner releases subtree
```
The controller itself is stateless; lifecycle labels describe borrowed instance state.
## Main sequence
```mermaid
sequenceDiagram
participant L as StreamingWorldLoader
participant F as M2AnimatedSceneFinalizer
participant P as M2AnimationPlaybackController
participant N as M2NativeAnimator
participant A as AnimationPlayer
L->>P: copy_native_animator_data(prototype, duplicate, script)
L->>F: animation_players_in_subtree(duplicate)
F-->>L: ordered players
L->>P: start_instance_playback(path, index, players, debug)
P->>N: prepare_runtime and set_phase
P->>A: choose, loop, play and seek
P-->>L: optional detached native diagnostics
L->>L: preserve existing log format
```
## Dependency diagram
```mermaid
flowchart TB
Loader[StreamingWorldLoader] --> Playback[M2AnimationPlaybackController]
Finalizer[M2AnimatedSceneFinalizer] --> Loader
Playback --> Engine[Node / Script / AnimationPlayer / Animation]
Loader --> Batch[SceneTree batch materialization]
Loader --> NativeScript[M2NativeAnimator script]
Playback -. no dependency .-> ResourceLoader
Playback -. no dependency .-> Cache[M2PrototypeCacheState]
Playback -. no dependency .-> Scheduler[RenderBudgetScheduler]
```
## Ownership, threading and resources
- Loader owns prototype duplication, instance/batch roots and SceneTree attachment.
- Finalizer traversal supplies borrowed AnimationPlayer references.
- Controller borrows Nodes/Script/players only for the synchronous call.
- Native arrays are assigned by reference exactly as before extraction.
- Diagnostic Dictionaries are deep-duplicated before return.
- Main thread performs all engine-object mutation; pure phase math is thread-safe.
## Errors, cancellation and recovery
| Failure | Detection | Behavior | Diagnostic | Recovery |
|---|---|---|---|---|
| Missing roots/script | Inventory guard | No native copy/start | Contract fixture | Correct composition |
| Fewer target animators | Pair-count minimum | Copy available pairs only | Native copy fixture | Rebuild import/prototype |
| No matching name | Ordered fallback | Substring, first name, then empty | Selection fixtures | Add compatible animation |
| Empty animation selection | Empty result | Skip loop/play/seek for that player | Selection fixture | Static/native path continues |
| Zero-length selected animation | Length guard | Play without seek | Playback contract | Imported timing remains engine-owned |
| Cancellation/shutdown | Outside service | No retained state | N/A | Loader owns subtree release |
## Configuration and capabilities
| Setting/capability | Default | Profile | Runtime mutable | Effect |
|---|---|---|---|---|
| Phase buckets | 1000 | All | No | Stable per path/index desynchronization |
| Loop mode | `LOOP_LINEAR` | All | No | Every available imported animation loops |
| Native diagnostics | `debug_streaming` | Debug | Yes | Samples state only when requested |
## Persistence, cache and migration
No state or format is serialized. GLB/native cache formats, prototype lifetime
and material versions are unchanged; no rebake is required.
## Diagnostics and observability
- Optional native states remain detached and contain existing prepared,
processing, mesh, bone, surface and length fields.
- Loader retains `M2_NATIVE_ANIMATOR` log formatting and path normalization.
- Controller emits no logs or metrics.
## Verification
- `verify_m2_animation_playback_controller.gd` covers exact phase, ordinary/
fish/bird priorities, substring/first fallback, loop/play/seek, native exact-
script order, five-field copy, phase, detached diagnostics and boundaries.
- Finalizer/build/prototype/material/shutdown regressions protect adjacent behavior.
- Fidelity evidence is exact policy/mutation extraction; no private asset or
original-client animation comparison is claimed.
- Performance budget: 20,000 phase-and-selection pairs under one second.
## Extension points
Server-driven animation state may later replace default selection through a
separate presentation contract; this fallback controller must remain available
for world doodads and compatibility fixtures.
## Capability status
| Capability | Status | Evidence | Gap/next step |
|---|---|---|---|
| Imported default selection/playback | Implemented extraction | Synthetic priority/play/seek verifier | Asset-backed animation-name corpus pending |
| Native data/phase startup | Implemented extraction | Exact-reference/native state verifier | Native visual fidelity remains experimental |
| Instance/batch materialization | Existing loader-owned | Adjacent build tests | Safe extraction next |
## Known gaps and risks
- Hash phase intentionally depends on existing Godot String hashing behavior.
- Default-name heuristics are not a complete WoW animation-state mapping.
- No proprietary traversal, animation timing comparison, p95/p99 or paired-client run exists.
## Source map
| Path | Responsibility |
|---|---|
| `src/render/m2/m2_animation_playback_controller.gd` | Phase, selection, native copy/start and imported playback |
| `src/render/m2/m2_animated_scene_finalizer.gd` | Accepted prototype/player inventory |
| `src/scenes/streaming/m2_native_animator.gd` | Experimental native deformation runtime |
| `src/scenes/streaming/streaming_world_loader.gd` | Instance duplication/attachment and diagnostic formatting |
| `src/tools/verify_m2_animation_playback_controller.gd` | Policy/mutation/boundary/timing regression |
## Related decisions and references
- [`m2-animated-scene-finalizer.md`](m2-animated-scene-finalizer.md)
- [`m2-build-batch-planner.md`](m2-build-batch-planner.md)
- [`world-renderer.md`](world-renderer.md)
- [`../../RENDER.md`](../../RENDER.md)
- [`../../targets/roadmap/02-rendering-and-graphics.md`](../../targets/roadmap/02-rendering-and-graphics.md)