- GenerationClosedException covers closed history routers, stages, saved biome runtimes and admissions
- It also covers ownership stores, hydrology caches and engine runtimes
- GenerationFailures tells engine, lifecycle, executor and JVM failures from content failures
- Engine failures rethrow from object, cave object, procedural, floating, upper and decorator catch sites
- Biome layer, noise bound, rotation and mantle write catch sites rethrow them too
- Only content failures are skipped
- A source plan is never cached or persisted without an object a healthy engine places
- A transient engine failure no longer turns imported features off
- 26.3 custom biomes write natural_mob_spawns as an overlay modifier with its argument, matching vanilla biomes
- NeoForge biome modifiers can add spawns to Iris biomes again
- The 26.3 custom biome codec test checks the overlay modifier
- Column biome hunk takes its fallback biome from the caller
- The fallback resolves on first unset read
- Bukkit chunk generator supplies plains
- Core keeps no new Bukkit coupling
- Chunk generator reports generation failures to the running pregen job
- Pregen methods forward generation failures to the async method
- Async pregen fails every outstanding request through an in-flight ledger
- In-flight requests settle once and ignore late completions
- Pregen aborts with the failing chunk as its cause
- Admission drain waits with a 60 second deadline
- Closing the admission gate fails leftover requests
- Tests cover failure propagation, the ledger and the drain deadline
- Dry layers keep head and ceiling equal to the bed after the transition taper
- Displaced layers that dry out also keep head and ceiling at the bed
- Transition displacement reads its datum from the original fluid head
- Tests cover dry banks and drying channels across a transition band
- Every getChunk(..).use() site calls Mantle.useChunk, which cannot fail because a save closed the chunk in between
- Covered-chunk cleanup, custom block and static object layers take their chunk through useChunk
- Discovered flag writes go through Mantle.flag instead of an unpinned chunk
- Test mantles stub useChunk the way the real one behaves
- PregenChunkRetention holds every chunk in a FULL request's dependency square until all in-area regions reaching it drained; drained regions keep only the border strips undrained neighbours need
- Removes the unload/reload churn (about 1.5 reloads per generated chunk at r1000: lattice passes, next region's border, future-region and ring protos)
- Capped at one chunk per MB of heap; over the cap the drained strips farthest from the active region are released; heap pressure and close release everything
- Regions still save and unload at drain; the early-unload test now pins that plus border retention
- A demanded owner missing from the owner cache is restored from its planned tile (resident or prepared-plan store) instead of drafted again
- Same restore path as persisted tiles; plans identical
- ChunkBlockUpdateListener remembers the last state with no update or custom effect
- Plain terrain runs skip the per-block isUpdatable and isCustom checks
- Test replays random writes against the per-write catch semantics
- saved biome capture resolves each quart column through one engine call
- column-invariant height, region, surface and cave fallback resolved once
- cavern reads use one pinned mantle chunk per column
- saved biome cells interned per capture
- engine getters borrow the bound route runtime for other chunks instead of opening a stage
- Pregeneration scope limits the lower-rank neighbour drafts an owner starts early to tiles the area composes from
- Undemanded ring drafts (and the early neighbours they started) are no longer computed; demanded ones still resolve on demand
- r2000 tile set: 80 -> 54 drafts, planning CPU -32%, plans identical
- dimension stack metadata clearing and continuation restore rewrite cavern cells after sCave, so they drop the context snapshot and decoration re-reads the mantle
- test that decoration reuses only its own chunk's snapshot
- boundary columns build runs directly instead of voxel lists, tree sets and hash maps
- palette sorted once per column with a direct comparator, same canonical order
- geometry source reuses the last encoded voxel
- equivalence test against the previous encoding
- ColumnExtentListeningHunk reports writes through a primitive listener instead of boxing ListeningHunk
- Palette layer generators memoized per seed slot instead of one shared recent entry
- Paint chunks z-major so neighbouring columns share block-buffer cache lines
- Fill the solid run below layers, river paint and cave ceilings with ores or rock in one loop
- Resolve chunk constants, air and bedrock once per chunk; drop the unread shared lastBedrock write
- IrisOreBands replaces IrisOreGeneratorBounds: per-Y candidate generators in list order
- Resolve a constant (FLAT) ore chance once instead of sampling it per block
- Column parity test against the per-block algorithm over randomized columns
- close reads each window slot before the atomic swap instead of swapping all 5,929 slots
- terrain-ready flags live with the terrain access and exist only on content writers
- Over the plate cap, the least recently used idle plates are saved one at a time on the IO pool while submissions continue
- Submissions wait only past the cap plus a small overshoot
- Replaces trimming and unloading every idle plate, which evicted the active working set and read it back
- eager terrain window covers the replayed object sources plus one chunk of footprint (radius 13 instead of 19 for overworld)
- content writers generate a chunk's missing terrain components before handing it out, so reads past the window stay identical
- getEagerInputRadius replaces isInputGenerationLazy
- sCave copies the chunk's cavern and hydrology terrain view once (journal originals win) instead of per-voxel monitor, journal and slice lookups
- hydrology lookups answer null without work in chunks with no cave cells
- decorateNaturalCaves reuses the sCave snapshot through the chunk context
- Each thread keeps its recent final hasColumnsAround answers next to its chunk slots, so the object and hydrology gates skip the nine-chunk scan on repeat
- frames live in a 256-slot table indexed by thread id, ThreadLocal only on slot collisions
- the single ThreadLocal probed long collision chains in the workers' thread-local maps
- Index planned tiles by occupied chunk; empty chunks skip composition, tile residency and cave-cell lookups
- Plan the whole pregen area nearest first with several roots, past the tile budget when plans persist
- Restore persisted tiles without a planning root permit
- Never memoize answers the server thread gave before its hydrology plan landed
