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worldgen: parse structure sets and place them on the vanilla grid

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Loads the 26.1.2 structure datapack: 20 structure sets, 34 structure
definitions, and the worldgen biome tags they reference. Random-spread
placement follows RandomSpreadStructurePlacement byte for byte — region
floorDiv by spacing, one Legacy stream salted per region, two
spread-type draws for the offset — and the four legacy frequency
reducers keep their exact draws, including the hardcoded buried-treasure
salt and the outpost's discarded full-range int.

Verified against the fixture: on seed 12345 the ruined_portals set
claims exactly chunk (1,0), the chunk whose captured blocks carry the
ruined portal's obsidian, gold, and crying obsidian. TestStructure-
PlacementGrid pins that plus village separation invariants.
This commit is contained in:
Daniar Mannanov 2026-08-26 10:33:10 +03:00
parent f162698302
commit c488ce274f
125 changed files with 2123 additions and 0 deletions
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9
internal/worldgen/data/structure_json/ocean_ruin_cold.json Normal file
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{
"type": "minecraft:ocean_ruin",
"biome_temp": "cold",
"biomes": "#minecraft:has_structure/ocean_ruin_cold",
"cluster_probability": 0.9,
"large_probability": 0.3,
"spawn_overrides": {},
"step": "surface_structures"
}