remo/RegionIO
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Bind the surface rule tree to the world seed

Browse source 
The tree was parsed once, globally, and shared by every world -- so every
condition that needs the seed simply did not work. Compiling it per RandomState
fixes four of them at once.

noise_threshold sampled a per-column random draw and pretended it was
"minecraft:surface"; the other six noises it names were unsupported and returned
false. Each condition now holds its own seeded noise, sampled once per column
into a small cache the way vanilla's LazyXZCondition does. Powder snow, packed
ice and ice appear in the dump for the first time; calcite, swamp water windows
and gravel patches have their conditions back too.

vertical_gradient tapered through a per-column RNG shared with the other rules.
Vanilla rolls a positional random at the exact block, from a factory named by
the rule. More importantly the anchor decoder read only above_bottom and
discarded which kind of anchor it was, so the deepslate rule's absolute 0..8
collapsed onto y=-64 and **no deepslate existed anywhere in the world**. Anchors
now carry their kind and resolve against the real height bounds -- which also
retires a hardcoded 384 in y_above.

Two more stubs land with them: hole is surfaceDepth <= 0 rather than a constant
false, and steep reads the neighbouring column heights. steep needs the whole
chunk's heightmap, so the column pass is now two passes -- terrain and fluids
for all 256 columns, then surface rules -- which is the order vanilla uses
anyway (doFill, then buildSurface).

Deepslate was also missing from the block-ID table, and an unknown name resolved
to 0, which the caller read as "no block" and skipped. So even a correct rule
would have placed nothing. Unknown names are now a parse error, deepslate and
mud are in the table, and a rule that resolves to air genuinely places air --
the frozen-ocean surface asks for exactly that.

Below y=0 is now entirely deepslate, y=1..7 a scatter, above y=8 none.
This commit is contained in:
Master290 2026-07-27 02:25:09 +03:00
parent 1083e47211
commit c19e5f0e4f
9 changed files with 478 additions and 255 deletions
Download patch file Download diff file Expand all files Collapse all files

14
internal/worldgen/structure.go
View file

@ -33,7 +33,7 @@ func LoadTemplate(path string) (*Template, error) {
if err != nil {
return nil, err
}
// NBT files are usually gzipped.
var r io.Reader = bytes.NewReader(b)
if len(b) >= 2 && b[0] == 0x1f && b[1] == 0x8b {
@ -81,7 +81,7 @@ func LoadTemplate(path string) (*Template, error) {
nameTag, _ := stateComp.Get("Name")
name := string(nameTag.(nbt.String))
props := make(map[string]string)
if propTag, ok := stateComp.Get("Properties"); ok {
if propComp, ok := propTag.(*nbt.Compound); ok {
for _, k := range propComp.Keys() {
@ -92,9 +92,11 @@ func LoadTemplate(path string) (*Template, error) {
}
}
}
id := surfaceBlockID(name, props)
if id == 0 && name != "minecraft:air" {
// Fallback to default block ID for the name
id, ok := surfaceBlockID(name, props)
if !ok {
// Structure templates name far more blocks than the
// surface rules do; fall back to the broader
// default-state table.
id = defaultBlockIDs[name]
}
tmpl.Palette = append(tmpl.Palette, id)
@ -112,7 +114,7 @@ func LoadTemplate(path string) (*Template, error) {
}
stateTag, _ := blockComp.Get("state")
stateIdx := int(stateTag.(nbt.Int))
var pos [3]int
if posTag, ok := blockComp.Get("pos"); ok {
if posList, ok := posTag.(nbt.List); ok && len(posList.Elems) == 3 {