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perf(scene): delta journal so edits touch only changed entities (phase 0-1)

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Every geometry mutation previously bumped a monotonic geometry_epoch and each
derived cache compared its stamp and, on a miss, re-walked the whole document —
so drawing or moving one line rebuilt every hatch / image / mesh / wipeout model
even though none of them changed.

Add a per-mutation delta journal: bump_entities(&[(Handle, ChangeKind)]) records
exactly which handles changed (Added / Removed / Modified), folding the memo drop
and the epoch bump into one call a site cannot forget. A bounded ring keeps the
recent deltas; replay_since(last_epoch) coalesces the changes past a consumer or
returns None (full rebuild) when a spanned delta is `full` or the consumer fell
off the ring. bump_geometry / bump_geometry_no_blocks push a `full` delta so the
journal is never missing a step.

Route the common single-entity ops through it: add (Added), update (Modified),
erase (Removed), move/rotate/scale/mirror (Modified), copy (Added). Gate the four
per-category model caches on category relevance — an edit whose handles are not in
a category leaves that category cache warm; a removal is treated conservatively
(the erased handle can no longer be classified), and the mesh cache also
invalidates on any INSERT edit since it carries the instanced block meshes.

Net: a plain-entity edit no longer rebuilds the hatch/image/mesh/wipeout model
sets. The resident wire clone-all and the GPU re-upload are still whole-set — the
journal is the groundwork for making those per-entity next. Adds 6 journal unit
tests (replay, coalescing, full-fallback, ring overflow, category gate).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-14 23:50:04 +03:00
commit 57401f6f32
4 changed files with 365 additions and 32 deletions
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11
src/scene/entity.rs
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@ -138,7 +138,9 @@ impl Scene {
if affects_blocks {
self.bump_geometry();
} else {
self.bump_geometry_no_blocks();
// Plain top-level add: name the new handle so every derived cache
// patches in just this one entity instead of rebuilding.
self.bump_entities(&[(handle, ChangeKind::Added)]);
}
}
handle
@ -259,11 +261,14 @@ impl Scene {
self.meshes.insert(handle, model);
}
self.mark_entity_dirty(handle);
if affects_blocks {
self.mark_entity_dirty(handle);
self.bump_geometry();
} else {
self.bump_geometry_no_blocks();
// One entity changed in place: report just this handle so every
// derived cache patches it instead of rebuilding (bump_entities also
// drops it from the tessellation memos).
self.bump_entities(&[(handle, ChangeKind::Modified)]);
}
true
}