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world: port ruined portal generation point and expose pre-carve terrain

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generateBaseTerrain now factors the noise+surface stage out of chunk
generation so structure placement can read pre-carve heights exactly
like vanilla's STRUCTURE_STARTS stage. RuinedPortalGenerationPoint
replays the ruined_portals set: the weighted pick across all seven
variants on its own stream, each attempt's setup/template/rotation/
mirror draws on a fresh GenerationContext stream (makeRandom reseeds
per attempt, confirmed from bytecode), findSuitableY with corner-column
settle scan against those heights, and the post-draw 3D-biome filter at
quart-snapped coordinates.

Known gap, documented in STRUCTURE_NOTES.md: no variant is accepted in
the window around the fixture's portal yet while vanilla placed one;
the biome/surface inputs need a vanilla-side probe to bisect. Not wired
into the production replay until that closes.
This commit is contained in:
Daniar Mannanov 2026-08-26 13:56:51 +03:00
parent 6e04bd8bbc
commit 798a3ec7b4
6 changed files with 454 additions and 31 deletions
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48
internal/worldgen/structures.go
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@ -86,12 +86,42 @@ func (p *rawPlacement) decode() (*Placement, error) {
}
}
// RuinedPortalSetup is one weighted entry of a ruined portal structure's
// "setups" list.
type RuinedPortalSetup struct {
Placement string `json:"placement"`
AirPocketProbability float32 `json:"air_pocket_probability"`
Mossiness float32 `json:"mossiness"`
Overgrown bool `json:"overgrown"`
Vines bool `json:"vines"`
ReplaceWithBlackstone bool `json:"replace_with_blackstone"`
CanBeCold bool `json:"can_be_cold"`
Weight float32 `json:"weight"`
}
// StructureDef is one entry of data/minecraft/worldgen/structure.
type StructureDef struct {
Name string `json:"-"`
Type string `json:"type"`
Biomes string `json:"biomes"`
Step string `json:"step"`
Name string `json:"-"`
Type string `json:"type"`
Biomes string `json:"biomes"`
Step string `json:"step"`
Setups []RuinedPortalSetup `json:"-"`
}
func decodeStructureDef(name string, raw []byte) (*StructureDef, error) {
var doc struct {
Type string `json:"type"`
Biomes string `json:"biomes"`
Step string `json:"step"`
Setups []RuinedPortalSetup `json:"setups"`
}
if err := json.Unmarshal(raw, &doc); err != nil {
return nil, err
}
return &StructureDef{
Name: name, Type: doc.Type, Biomes: strings.TrimPrefix(doc.Biomes, "minecraft:"),
Step: doc.Step, Setups: doc.Setups,
}, nil
}
// StructureSet is one entry of data/minecraft/worldgen/structure_set.
@ -183,14 +213,12 @@ func loadStructureSets() (*StructureSets, error) {
if err != nil {
return nil, err
}
var def StructureDef
if err := json.Unmarshal(raw, &def); err != nil {
name := "minecraft:" + strings.TrimSuffix(baseName(path), ".json")
def, err := decodeStructureDef(name, raw)
if err != nil {
return nil, fmt.Errorf("%s: %w", path, err)
}
name := "minecraft:" + strings.TrimSuffix(baseName(path), ".json")
def.Name = name
def.Biomes = strings.TrimPrefix(def.Biomes, "minecraft:")
out.Structures[name] = &def
out.Structures[name] = def
}
setFiles, err := fs.Glob(dataFS, "data/structure_set/*.json")