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High-performance Animatable Vector for SwiftUI
import SwiftUI
import enum Accelerate.vDSP
struct AnimatableVector: VectorArithmetic {
static var zero = AnimatableVector(values: [0.0])
static func + (lhs: AnimatableVector, rhs: AnimatableVector) -> AnimatableVector {
let count = min(lhs.values.count, rhs.values.count)
return AnimatableVector(values: vDSP.add(lhs.values[0..<count], rhs.values[0..<count]))
}
static func += (lhs: inout AnimatableVector, rhs: AnimatableVector) {
let count = min(lhs.values.count, rhs.values.count)
vDSP.add(lhs.values[0..<count], rhs.values[0..<count], result: &lhs.values[0..<count])
}
static func - (lhs: AnimatableVector, rhs: AnimatableVector) -> AnimatableVector {
let count = min(lhs.values.count, rhs.values.count)
return AnimatableVector(values: vDSP.subtract(lhs.values[0..<count], rhs.values[0..<count]))
}
static func -= (lhs: inout AnimatableVector, rhs: AnimatableVector) {
let count = min(lhs.values.count, rhs.values.count)
vDSP.subtract(lhs.values[0..<count], rhs.values[0..<count], result: &lhs.values[0..<count])
}
var values: [Double]
mutating func scale(by rhs: Double) {
vDSP.multiply(rhs, values, result: &values)
}
var magnitudeSquared: Double {
vDSP.sum(vDSP.multiply(values, values))
}
}
@AlexRoar
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AlexRoar commented Aug 10, 2021

That's a nice tool.

However, consider using Float over Double in this case. Float arithmetic is faster than that of Double. Also, Double precision is an overkill for animation.

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