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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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40
internal/world/feature_scheduler.go
View file

@ -1,6 +1,10 @@
package world
import "fmt"
import (
"fmt"
"regionio/internal/worldgen"
)
// decorationSource is a source chunk whose feature pass may inspect or write a
// target chunk. Vanilla FEATURES has a one-chunk block-state write radius.
@ -28,7 +32,14 @@ func decorationSources(targetX, targetZ int32) []decorationSource {
// This is an explicit canonical order for isolated generation. It must not
// replace the production path until parity evidence confirms that it matches
// vanilla's chunk-status scheduling order.
func (r *decorationRegion) replayScheduledOres(seed int64, targetX, targetZ int32) error {
func (r *decorationRegion) replayScheduledOres(od *worldgen.OverworldDensity, seed int64, targetX, targetZ int32) error {
// Structures generate before every feature stage: applyBiomeDecoration
// places all referenced starts first and only then walks the feature
// steps. Their origins reach two chunks out because a portal template can
// span that far.
if err := r.placeScheduledStructures(od, seed, targetX, targetZ); err != nil {
return fmt.Errorf("world: structure starts (%d,%d): %w", targetX, targetZ, err)
}
for _, source := range decorationSources(targetX, targetZ) {
if err := r.setSource(source.X, source.Z); err != nil {
return err
@ -51,3 +62,28 @@ func (r *decorationRegion) replayScheduledOres(seed int64, targetX, targetZ int3
}
return nil
}
// placeScheduledStructures replays every structure start whose pieces may
// reach the target chunk. Only the ruined_portals set is ported so far.
func (r *decorationRegion) placeScheduledStructures(od *worldgen.OverworldDensity, seed int64, targetX, targetZ int32) error {
sets, err := worldgen.LoadStructureSets()
if err != nil {
return err
}
for sx := targetX - 2; sx <= targetX+2; sx++ {
for sz := targetZ - 2; sz <= targetZ+2; sz++ {
stub, err := RuinedPortalGenerationPoint(od, sets, seed, sx, sz)
if err != nil {
return err
}
if stub == nil {
continue
}
if err := PlaceRuinedPortalPiece(r, stub); err != nil {
return err
}
}
}
return nil
}