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tower world gen

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a dinosaur
2024-09-04 01:38:27 +10:00
parent f77b64cc85
commit 080522e01b
9 changed files with 168 additions and 49 deletions
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32
Sources/Voxelotl/Noise/PerlinNoiseGenerator.swift
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@ -1,18 +1,22 @@
import Foundation
public struct ImprovedPerlin<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D, CoherentNoise3D {
public struct ImprovedPerlin<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D, CoherentNoise3D, CoherentNoiseRandomInit {
private let p: [Int16]
public init() {
self.init(permutation: defaultPermutation)
}
public init(permutation: [Int16]) {
assert(permutation.count == 0x100)
self.p = permutation
}
public init(random: inout any RandomProvider) {
public init<Random: RandomProvider>(random: inout Random) {
self.p = (0..<0x100).map { Int16($0) }.shuffled(using: &random)
}
public func get(_ point: SIMD2<T>) -> T {
public func get(_ point: SIMD2<Scalar>) -> Scalar {
// Find unit square
let idx = SIMD2(Int(floor(point.x)), Int(floor(point.y))) & 0xFF
// Find relative point in square
@ -37,7 +41,7 @@ public struct ImprovedPerlin<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise
grad(perm(bb), inner - .init(repeating: 1))))
}
public func get(_ point: SIMD3<T>) -> T {
public func get(_ point: SIMD3<Scalar>) -> Scalar {
// Find unit cube containg point
let idx = SIMD3(Int(floor(point.x)), Int(floor(point.y)), Int(floor(point.z))) & 0xFF
// Find relative point in cube
@ -74,9 +78,9 @@ public struct ImprovedPerlin<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise
@inline(__always) fileprivate func perm(_ x: Int) -> Int { Int(self.p[x & 0xFF]) }
@inline(__always) fileprivate func grad(_ hash: Int, _ point: SIMD2<T>) -> T { grad(hash, SIMD3(point, 0)) }
@inline(__always) fileprivate func grad(_ hash: Int, _ point: SIMD2<Scalar>) -> Scalar { grad(hash, SIMD3(point, 0)) }
fileprivate func grad(_ hash: Int, _ point: SIMD3<T>) -> T {
fileprivate func grad(_ hash: Int, _ point: SIMD3<Scalar>) -> Scalar {
// Convert low 4 bits of hash code into 12 gradient directions
let low4 = hash & 0xF
var u = low4 < 8 ? point.x : point.y
@ -86,3 +90,19 @@ public struct ImprovedPerlin<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise
return u + v
}
}
internal let defaultPermutation: [Int16] = [
151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,
8, 99,37,240,21,10,23,190, 6,148,247,120,234,75, 0,26,197,62,94,252,219,203,
117,35, 11,32,57,177,33, 88,237,149,56,87,174,20,125,136,171,168, 68,175,74,
165,71,134,139,48, 27,166,77,146,158,231,83,111,229,122, 60,211,133,230,220,
105,92,41,55,46,245,40,244,102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,
187,208, 89, 18,169,200,196,135,130,116,188,159, 86,164,100,109,198,173,186,
3,64,52,217,226,250,124,123, 5,202, 38,147,118,126,255,82,85,212,207,206,59,
227,47,16,58,17,182,189,28,42,223,183,170,213,119,248,152, 2,44,154,163, 70,
221,153,101,155,167, 43,172,9,129,22,39,253, 19, 98,108,110, 79,113,224,232,
178,185, 112,104,218,246,97,228,251, 34,242,193,238,210,144, 12,191,179,162,
241, 81,51,145,235,249,14,239,107,49,192,214, 31,181,199,106,157,184,84,204,
176,115,121,50,45,127, 4,150,254,138,236,205,93,222,114,67,29,24,72,243,141,
128,195,78,66,215,61,156,180
]