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a dinosaur
2024-09-05 22:32:30 +10:00
parent 301aa28c4d
commit fed6a26882
6 changed files with 97 additions and 42 deletions
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39
Sources/Voxelotl/Noise/SimplexNoise.swift
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@ -3,22 +3,6 @@ import Foundation
public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNoise2D, CoherentNoise3D, CoherentNoise4D, CoherentNoiseRandomInit, CoherentNoiseTableInit {
private let p: [Int16], pMod12: [Int16]
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<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),
.init(-1, 0, 1, 1), .init(-1, 0, 1, -1), .init(-1, 0, -1, 1), .init(-1, 0, -1, -1),
.init( 1, 1, 0, 1), .init( 1, 1, 0, -1), .init( 1, -1, 0, 1), .init( 1, -1, 0, -1),
.init(-1, 1, 0, 1), .init(-1, 1, 0, -1), .init(-1, -1, 0, 1), .init(-1, -1, 0, -1),
.init( 1, 1, 1, 0), .init( 1, 1, -1, 0), .init( 1, -1, 1, 0), .init( 1, -1, -1, 0),
.init(-1, 1, 1, 0), .init(-1, 1, -1, 0), .init(-1, -1, 1, 0), .init(-1, -1, -1, 0)
]
public init(permutation: [Int16]) {
assert(permutation.count == 0x100)
self.p = permutation
@ -58,7 +42,7 @@ public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNo
return 0
} else {
t *= t
return t * t * self.grad3[gradID].xy.dot(corner)
return t * t * SIMD2<Scalar>(grad3[gradID].xy).dot(corner)
}
}
let noise0 = cornerContribution(corner0, gradIndex0)
@ -125,7 +109,7 @@ public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNo
return 0
} else {
t *= t
return t * t * self.grad3[gradID].dot(corner)
return t * t * SIMD3<Scalar>(grad3[gradID]).dot(corner)
}
}
let noise0 = cornerContribution(corner0, gradCorner0)
@ -197,7 +181,7 @@ public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNo
return 0
} else {
t *= t
return t * t * self.grad4[gradID].dot(corner)
return t * t * SIMD4<Scalar>(grad4[gradID]).dot(corner)
}
}
let noise0 = cornerContribution(corner0, gradIndex0)
@ -212,3 +196,20 @@ public struct SimplexNoise<Scalar: BinaryFloatingPoint & SIMDScalar>: CoherentNo
@inline(__always) fileprivate func perm(_ idx: Int) -> Int { Int(self.p[idx & 0xFF]) }
@inline(__always) fileprivate func permMod12(_ idx: Int) -> Int { Int(self.pMod12[idx & 0xFF]) }
}
fileprivate let grad3: [SIMD3<Int16>] = [
.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)
]
fileprivate let grad4: [SIMD4<Int16>] = [
.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),
.init(-1, 0, 1, 1), .init(-1, 0, 1, -1), .init(-1, 0, -1, 1), .init(-1, 0, -1, -1),
.init( 1, 1, 0, 1), .init( 1, 1, 0, -1), .init( 1, -1, 0, 1), .init( 1, -1, 0, -1),
.init(-1, 1, 0, 1), .init(-1, 1, 0, -1), .init(-1, -1, 0, 1), .init(-1, -1, 0, -1),
.init( 1, 1, 1, 0), .init( 1, 1, -1, 0), .init( 1, -1, 1, 0), .init( 1, -1, -1, 0),
.init(-1, 1, 1, 0), .init(-1, 1, -1, 0), .init(-1, -1, 1, 0), .init(-1, -1, -1, 0)
]