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Pin biome fitness against vanilla runtime

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This commit is contained in:
Daniar Mannanov 2026-08-10 23:59:22 +03:00
parent be8f030698
commit b11e6f14cb
5 changed files with 86 additions and 10 deletions
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16
internal/worldgen/biome.go
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@ -4,7 +4,7 @@ import "math"
// This file reproduces net.minecraft.world.level.biome.Climate, the multi-noise
// biome selector. A point in climate space is six quantized coordinates
// (temperature, humidity, continentalness, erosion, weirdness, depth); the
// (temperature, humidity, continentalness, erosion, depth, weirdness); the
// finder returns the biome whose parameter range is closest to the point by the
// vanilla fitDistance metric.
//
@ -23,13 +23,13 @@ func quantize(v float64) int64 {
func Quantize(v float64) int64 { return quantize(v) }
// AxisCount is the number of climate coordinates (temperature, humidity,
// continentalness, erosion, weirdness, depth).
// continentalness, erosion, depth, weirdness).
const AxisCount = 6
// TargetPoint is a fully-specified climate point: the value the biome finder
// tries to match against parameter ranges. Fields are pre-quantized longs.
type TargetPoint struct {
Temperature, Humidity, Continentalness, Erosion, Weirdness, Depth int64
Temperature, Humidity, Continentalness, Erosion, Depth, Weirdness int64
}
// NewTargetPoint quantizes six float climate coordinates into a TargetPoint.
@ -39,15 +39,15 @@ func NewTargetPoint(temp, humid, cont, ero, weird, depth float64) TargetPoint {
Humidity: quantize(humid),
Continentalness: quantize(cont),
Erosion: quantize(ero),
Weirdness: quantize(weird),
Depth: quantize(depth),
Weirdness: quantize(weird),
}
}
// fitDistance is the vanilla distance from a point to a parameter range. A
// coordinate inside a range contributes zero; offset is applied separately.
func fitDistance(point TargetPoint, ranges [AxisCount]ClimateRange, offset int64) int64 {
values := [AxisCount]int64{point.Temperature, point.Humidity, point.Continentalness, point.Erosion, point.Weirdness, point.Depth}
values := [AxisCount]int64{point.Temperature, point.Humidity, point.Continentalness, point.Erosion, point.Depth, point.Weirdness}
var total int64
for i, value := range values {
r := ranges[i]
@ -73,7 +73,7 @@ func (r ClimateRange) contains(v int64) bool { return v >= r.Min && v <= r.Max }
// BiomeParameter is one biome entry's full climate signature plus its name.
type BiomeParameter struct {
Name string
// ranges[0..5] = temperature, humidity, continentalness, erosion, weirdness, depth.
// ranges[0..5] = temperature, humidity, continentalness, erosion, depth, weirdness.
Ranges [AxisCount]ClimateRange
Offset int64
}
@ -118,6 +118,6 @@ func containsAll(ranges [AxisCount]ClimateRange, p TargetPoint) bool {
ranges[1].contains(p.Humidity) &&
ranges[2].contains(p.Continentalness) &&
ranges[3].contains(p.Erosion) &&
ranges[4].contains(p.Weirdness) &&
ranges[5].contains(p.Depth)
ranges[4].contains(p.Depth) &&
ranges[5].contains(p.Weirdness)
}