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world: place ruined portal pieces into the region replay

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PlaceRuinedPortalPiece runs the template through the decoded processor
stack — positional Legacy streams per cell drive the gold-to-air,
lava-to-magma, netherrack-to-magma and block-age mossiness rolls, the
features-cannot-replace guard skips protected cells, and template lava
stays when it lands in existing lava. Drip columns below the portal
draw from a documented approximation of the shared decoration stream;
spreadNetherrack is not needed for the underground setups.

The placement chain is now proven end to end: chunk (1,0) reproduces
vanilla's saved start (portal_6, CLOCKWISE_90, NONE, air pocket at
(16,12,0)) and the fixture parity ticks up to 98.033% with biomes and
heightmaps still exact. generatorVersion bumps to 23.
This commit is contained in:
Daniar Mannanov 2026-08-26 15:26:42 +03:00
parent 0bb480279f
commit 120531c13d
10 changed files with 366 additions and 14 deletions
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2
internal/world/store.go
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@ -33,7 +33,7 @@ const dataVersion26 = 4790
// first time it ran: chunkAt prefers the store over the generator, so the
// already-explored area around spawn keeps its old terrain and every later fix
// looks like it did nothing in exactly the place you are standing.
const generatorVersion = 22
const generatorVersion = 23
// generatorVersionTag is the NBT key holding generatorVersion. It is namespaced
// because it is ours, not part of the vanilla chunk format.