mc gen start

2026-07-05 10:25:43 +02:00
parent 201e0dfa44
commit a8b090227b
6 changed files with 433 additions and 0 deletions
@@ -0,0 +1,70 @@
+package gen
+
+type NoiseParam int
+
+const (
+	NoiseParamTemperature NoiseParam = iota
+	NoiseParamHumidity
+	NoiseParamContinentalNess
+	NoiseParamErosion
+	NoiseParamShift
+	NoiseParamWeirdness
+)
+
+type NoiseParamMapV struct {
+	A []float64
+	S string
+	O int
+}
+
+var NoiseParamMap = map[NoiseParam]NoiseParamMapV{
+	NoiseParamShift:           {A: []float64{1, 1, 1, 0}, S: "minecraft:offset", O: -3},
+	NoiseParamTemperature:     {A: []float64{1.5, 0, 1, 0, 0, 0}, S: "minecraft:temperature", O: -10},
+	NoiseParamHumidity:        {A: []float64{1, 1, 0, 0, 0, 0}, S: "minecraft:vegetation", O: -8},
+	NoiseParamContinentalNess: {A: []float64{1, 1, 2, 2, 2, 1, 1, 1, 1}, S: "minecraft:continentalness", O: -9},
+	NoiseParamErosion:         {A: []float64{1, 1, 0, 1, 1}, S: "minecraft:erosion", O: -9},
+	NoiseParamWeirdness:       {A: []float64{1, 2, 1, 0, 0, 0}, S: "minecraft:ridge", O: -7},
+}
+
+func InitClimateSeed(n NoiseParam, x Xoroshiro, large bool, nmax int) DoublePerlin {
+	v := NoiseParamMap[n]
+	s := v.S
+	if large && n != NoiseParamShift && n != NoiseParamWeirdness {
+		s += "_large"
+	}
+	x.XorString(s) // SLOW potential
+	return DoublePerlinFromXoroshiro(x, v.A, v.O, len(v.A), nmax)
+}
+
+type BiomeNoise struct {
+	Temperature, Humidity, ContinentalNess, Erosion, Shift, Weirdness DoublePerlin
+}
+
+func BiomeNoiseFromXoroshiro(x Xoroshiro, large bool) (v BiomeNoise) {
+	x = x.Split()
+
+	v.Temperature = InitClimateSeed(NoiseParamTemperature, x, large, -1)
+	v.Humidity = InitClimateSeed(NoiseParamHumidity, x, large, -1)
+	v.ContinentalNess = InitClimateSeed(NoiseParamContinentalNess, x, large, -1)
+	v.Erosion = InitClimateSeed(NoiseParamErosion, x, large, -1)
+	v.Shift = InitClimateSeed(NoiseParamShift, x, large, -1)
+	v.Weirdness = InitClimateSeed(NoiseParamWeirdness, x, large, -1)
+	return
+}
+
+func (b BiomeNoise) Sample(x, y, z int) {
+	px := float64(x)
+	pz := float64(z)
+	px += b.Shift.Sample(px, 0, pz) * 4
+	pz += b.Shift.Sample(pz, float64(x), 0) * 4
+
+	c := b.ContinentalNess.Sample(px, 0, pz)
+	e := b.Erosion.Sample(px, 0, pz)
+	w := b.Weirdness.Sample(px, 0, pz)
+	t := b.Temperature.Sample(px, 0, pz)
+	h := b.Humidity.Sample(px, 0, pz)
+
+	d := float64(0) // FIXME
+	var combinedData = [6]int64{int64(t * 10000), int64(h * 10000), int64(c * 10000), int64(e * 10000), int64(d * 10000), int64(w * 10000)}
+	_ = combinedData
+}