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Tune EU7 PACK streaming with v10 CHNK sub-chunks and worker read cache

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Chunk PACK sections at bake time and decode them incrementally at runtime
to cut apply hitches during fast camera flight; cache parsed section headers
per worker thread to avoid reopening and reparsing on every sub-chunk read.
This commit is contained in:
maj00r
2026-06-14 19:49:24 +02:00
parent 8c069ec5f2
commit 56d72fb25e
9 changed files with 336 additions and 23 deletions
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docs/eu7-format.md
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@@ -831,6 +831,28 @@ Sekcje v7 bez nagłówka (flat) pozostają czytelne — brak UMES, runtime skanu
Runtime używa UMES do cold preload meshów zamiast liniowego skanowania wszystkich instancji w sekcji.
### Format sekcji — v10 CHNK (`kPackSectionFormatV10 = 3`)
Rozszerzenie v9: po UMES tabela sub-chunków (domyślnie 512 modeli/chunk przy bake).
```
uint8 section_format — musi być = 3
uint32 solo_count
uint32 inst_count
uint32 unique_mesh_count
uint32[unique_mesh_count] string_id
uint32 chunk_count
Powtórzone chunk_count razy:
uint32 chunk_model_count
uint32 chunk_byte_offset — offset od początku sekcji (względem PIDX pack_offset)
[payload chunków — solo modele, chunk_model_count rekordów każdy]
```
Runtime: worker czyta `read_pack_section_chunk_load(row, col, chunk_index)` z O(1) seek.
Sekcje v9 (format=2) i v7 flat pozostają kompatybilne (`chunk_count` implicit = 1).
---
## 30. PROT — prototypy modeli (v8+)