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worldgen: add vanilla biome search and decoration RNG

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This commit is contained in:
Daniar Mannanov 2026-08-25 03:58:30 +03:00
parent 736f387b41
commit fd32c65da9
6 changed files with 383 additions and 10 deletions
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24
internal/worldgen/random_test.go
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@ -120,3 +120,27 @@ func TestDecorationAndFeatureSeedVectors(t *testing.T) {
}
}
}
func TestXoroshiroWorldgenDecorationVector(t *testing.T) {
random := NewWorldgenRandom(0)
decorationSeed := random.SetDecorationSeed(12345, 0, 0)
if decorationSeed != 12345 {
t.Fatalf("decoration seed = %d, want 12345", decorationSeed)
}
random.SetFeatureSeed(decorationSeed, 10, 6)
if got := random.NextIntN(16); got != 3 {
t.Fatalf("nextInt(16) = %d, want 3", got)
}
if got := random.NextIntN(16); got != 9 {
t.Fatalf("second nextInt(16) = %d, want 9", got)
}
if got := random.NextIntN(65); got != 21 {
t.Fatalf("nextInt(65) = %d, want 21", got)
}
if got := random.NextFloat(); math.Abs(float64(got-0.4394614)) > 1e-7 {
t.Fatalf("nextFloat = %.9f, want 0.4394614", got)
}
if got := random.NextDouble(); math.Abs(got-0.6041286197351282) > 1e-15 {
t.Fatalf("nextDouble = %.17f, want 0.6041286197351282", got)
}
}