SashegDev
874b6f20c2
Основа — Horizon (MIT). История апстрима не переносится: этот репозиторий ведёт свою.
34 lines
2.1 KiB
Markdown
34 lines
2.1 KiB
Markdown
# Biome temperatures
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Horizon implements Java Edition **26.3** biome temperature sampling, including the
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frozen modifier, height adjustment, rain/snow thresholds, precipitation selection
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and the small frozen-ocean iceberg melt predicate. The fixed seeded simplex and
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noise-stack sources use the existing Rust noise implementation.
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`BiomeTemperatureSettings` supplies the immutable inputs. `BiomeTemperature` is a
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per-biome, per-worker cache, corresponding to vanilla's thread-local cache. Its
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1,024-entry insertion order does not change on hits. Keys use packed block
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positions and omit sea level, preserving both coordinate aliases and cached
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results across sea-level changes. NaN values are recomputed, including vanilla's
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eviction behavior when a cached NaN is queried at capacity.
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Run `python3 tools/test_biome_temperature_parity.py`. The
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[local report](../benchmarks/rust-biome-temperature-2026-10-06/scoped-parity.json)
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records **836,659 matching output lines per reference JAR** over **387 fixtures**,
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including **12 thread-isolation fixtures**. The original Java transport invokes
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actual biome methods and inspects native ordered cache contents. Test inputs
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include arbitrary base-temperature bits, threshold neighbors, both modifiers,
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precipitation enabled/disabled, extreme coordinates, sea-level overflow, packed
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aliases, cache hits/eviction and actual native threads with separate Rust workers.
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The oracle constructs native climate settings and biomes with only the fields
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these methods use. Climate-setting parsing now covers all **67 bundled biome definitions** and
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**183 codec inputs**, including float rounding, overflow, field validation and
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modifier defaults. Full biome codecs, climate encoding, world-dependent snow/ice placement,
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automatic thread-local ownership for a shared
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Rust biome object remain pending. Source/fixture hashes guard the comparison;
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raw reference artifacts stay private under `.local`.
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[Material temperature and biome conditions](material-conditions.md) now use these
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climate settings and cached temperature calculations in a separate integration suite.
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