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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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44
Sources/Voxelotl/Noise/SimplexNoise.swift
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@ -1,14 +1,14 @@
import Foundation
public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D, CoherentNoise3D, CoherentNoise4D {
public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D, CoherentNoise3D, CoherentNoise4D, CoherentNoiseRandomInit {
private let p: [Int16], pMod12: [Int16]
private let grad3: [SIMD3<T>] = [
private let grad3: [SIMD3<Scalar>] = [
.init(1, 1, 0), .init(-1, 1, 0), .init(1, -1, 0), .init(-1, -1, 0),
.init(1, 0, 1), .init(-1, 0, 1), .init(1, 0, -1), .init(-1, 0, -1),
.init(0, 1, 1), .init( 0, -1, 1), .init(0, 1, -1), .init( 0, -1, -1)
]
private let grad4: [SIMD4<T>] = [
private let grad4: [SIMD4<Scalar>] = [
.init( 0, 1, 1, 1), .init( 0, 1, 1, -1), .init( 0, 1, -1, 1), .init( 0, 1, -1, -1),
.init( 0, -1, 1, 1), .init( 0, -1, 1, -1), .init( 0, -1, -1, 1), .init( 0, -1, -1, -1),
.init( 1, 0, 1, 1), .init( 1, 0, 1, -1), .init( 1, 0, -1, 1), .init( 1, 0, -1, -1),
@ -19,21 +19,25 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
.init(-1, 1, 1, 0), .init(-1, 1, -1, 0), .init(-1, -1, 1, 0), .init(-1, -1, -1, 0)
]
public init() {
self.init(permutation: defaultPermutation)
}
public init(permutation: [Int16]) {
assert(permutation.count == 0x100)
self.p = permutation
self.pMod12 = self.p.map { $0 % 12 }
}
public init(random: inout any RandomProvider) {
public init<Random: RandomProvider>(random: inout Random) {
self.p = (0..<0x100).map { Int16($0) }.shuffled(using: &random)
self.pMod12 = self.p.map { $0 % 12 }
}
public func get(_ point: SIMD2<T>) -> T {
public func get(_ point: SIMD2<Scalar>) -> Scalar {
// Skew space into rhobuses to find which simplex cell we're in
let f2 = 0.5 * (T(3).squareRoot() - 1)
let g2 = (3 - T(3).squareRoot()) / 6
let f2 = 0.5 * (Scalar(3).squareRoot() - 1)
let g2 = (3 - Scalar(3).squareRoot()) / 6
let skewFactor = point.sum() * f2
let cellID = SIMD2(floor(point.x + skewFactor), floor(point.y + skewFactor))
let cellOrigin = cellID - (cellID.sum() * g2)
@ -42,7 +46,7 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
// For the 2d case, the simplex shape is an equilateral triangle
// Determine which side of the rhombus on to find the simplex
let cornerOfs1: SIMD2<Int> = corner0.x > corner0.y ? .init(1, 0) : .init(0, 1)
let corner1 = corner0 - SIMD2<T>(cornerOfs1) + g2
let corner1 = corner0 - SIMD2<Scalar>(cornerOfs1) + g2
let corner2 = corner0 - 1 + 2 * g2
// Compute the hashed gradient indices of the three simplex corners
@ -52,7 +56,7 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
let gradIndex2 = permMod12(cellHash.x + 1 + perm(cellHash.y + 1))
// Calculate the contribution from the three corners
@inline(__always) func cornerContribution(_ corner: SIMD2<T>, _ gradID: Int) -> T {
@inline(__always) func cornerContribution(_ corner: SIMD2<Scalar>, _ gradID: Int) -> Scalar {
var t = 0.5 - corner.x * corner.x - corner.y * corner.y
if t < 0 {
return 0
@ -68,9 +72,9 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
return 70 * (noise0 + noise1 + noise2)
}
public func get(_ point: SIMD3<T>) -> T {
public func get(_ point: SIMD3<Scalar>) -> Scalar {
// Skew space into rhombohedrons to find which simplex cell we're in
let g3 = 1 / T(6), f3 = 1 / T(3)
let g3 = 1 / Scalar(6), f3 = 1 / Scalar(3)
let skewFactor = point.sum() * f3
let cellID = SIMD3(floor(point.x + skewFactor), floor(point.y + skewFactor), floor(point.z + skewFactor))
let cellOrigin = cellID - (cellID.sum() * g3)
@ -95,8 +99,8 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
(.init(0, 1, 0), .init(1, 1, 0)) // Y X Z
}
}
let corner1 = corner0 - SIMD3<T>(corner1ID) + g3
let corner2 = corner0 - SIMD3<T>(corner2ID) + 2 * g3
let corner1 = corner0 - SIMD3<Scalar>(corner1ID) + g3
let corner2 = corner0 - SIMD3<Scalar>(corner2ID) + 2 * g3
let corner3 = corner0 - 1 + 3 * g3
// Compute the hashed gradient indices of the four simplex corners
@ -119,7 +123,7 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
cellHash.z + 1)))
// Calculate the contribution from the four corners
@inline(__always) func cornerContribution(_ corner: SIMD3<T>, _ gradID: Int) -> T {
@inline(__always) func cornerContribution(_ corner: SIMD3<Scalar>, _ gradID: Int) -> Scalar {
var t = 0.6 - corner.x * corner.x - corner.y * corner.y - corner.z * corner.z
if t < 0 {
return 0
@ -136,8 +140,8 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
return 32 * (noise0 + noise1 + noise2 + noise3)
}
public func get(_ point: SIMD4<T>) -> T {
let g4 = (5 - T(5).squareRoot()) / 20, f4 = (T(5).squareRoot() - 1) / 4
public func get(_ point: SIMD4<Scalar>) -> Scalar {
let g4 = (5 - Scalar(5).squareRoot()) / 20, f4 = (Scalar(5).squareRoot() - 1) / 4
let skewFactor = point.sum() * f4
let cellID = SIMD4(floor(point.x + skewFactor), floor(point.y + skewFactor), floor(point.z + skewFactor), floor(point.w + skewFactor))
let cellOrigin = cellID - (cellID.sum() * g4)
@ -157,9 +161,9 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
let cornerOfs1 = SIMD4<Int>.zero.replacing(with: .one, where: rank .>= 3)
let cornerOfs2 = SIMD4<Int>.zero.replacing(with: .one, where: rank .>= 2)
let cornerOfs3 = SIMD4<Int>.zero.replacing(with: .one, where: rank .>= 1)
let corner1 = corner0 - SIMD4<T>(cornerOfs1) + g4
let corner2 = corner0 - SIMD4<T>(cornerOfs2) + 2 * g4
let corner3 = corner0 - SIMD4<T>(cornerOfs3) + 3 * g4
let corner1 = corner0 - SIMD4<Scalar>(cornerOfs1) + g4
let corner2 = corner0 - SIMD4<Scalar>(cornerOfs2) + 2 * g4
let corner3 = corner0 - SIMD4<Scalar>(cornerOfs3) + 3 * g4
let corner4 = corner0 - 1 + 4 * g4
// Compute the hashed gradient indices of the five simplex corners
@ -191,7 +195,7 @@ public struct SimplexNoise<T: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D
cellHash.w + 1))))) & 0x1F
// Calculate the contribution from the five corners
@inline(__always) func cornerContribution(_ corner: SIMD4<T>, _ gradID: Int) -> T {
@inline(__always) func cornerContribution(_ corner: SIMD4<Scalar>, _ gradID: Int) -> Scalar {
var t = corner.indices.reduce(0.6) { accum, i in accum - corner[i] * corner[i] }
if t < 0 {
return 0