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perf(scene): parallelize block AABB post-pass

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Extends Phase 2.1. compute_block_aabbs resolved each defn's union AABB
serially via defn_aabb_recursive, which only reads the finished defns map
and re-walks shared nested defns with no memoization — real cost on
block-heavy drawings. Split into a parallel read phase (per-name resolves
fan out over rayon) and a serial write-back phase. BlockCache is Sync, so
sharing &self across the read phase is sound.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-05 08:52:16 +03:00
commit 44eea23c3f
2 changed files with 20 additions and 6 deletions
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ROADMAP.md
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@ -114,7 +114,10 @@ No topological stratification was needed after all: `build_defn` stores
nested INSERTs as by-name references (`LocalSub::Nested`) and never expands
them at build time, so each defn depends only on the read-only `doc` — the
builds are embarrassingly parallel. Now a plain rayon `par_iter().collect()`.
`compute_block_aabbs` stays a serial post-pass (resolves nested refs, cheap).
`compute_block_aabbs` is also parallelized: its `defn_aabb_recursive` walk is
read-only over the finished `defns` map and re-walks shared nested defns
(no memo), so the per-name resolves fan out across rayon (read phase), then a
serial phase stores each AABB back.
### 2.2 Incremental wire cache (delta tessellation)