86 lines
2.0 KiB
Swift
86 lines
2.0 KiB
Swift
//
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// SparseSet.swift
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// FirebladeECS
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//
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// Created by Christian Treffs on 30.10.17.
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//
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public class SparseSet: UniformStorage {
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public typealias Element = Any
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public typealias Index = Int
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fileprivate typealias ComponentIdx = Int
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fileprivate var size: Int = 0
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fileprivate var dense: ContiguousArray<Pair?>
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fileprivate var sparse: [EntityIndex: ComponentIdx]
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fileprivate typealias Pair = (key: EntityIndex, value: Element)
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public init() {
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dense = ContiguousArray<Pair?>()
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sparse = [EntityIndex: ComponentIdx]()
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}
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deinit {
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clear()
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}
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public var count: Int { return size }
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internal var capacitySparse: Int { return sparse.capacity }
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internal var capacityDense: Int { return dense.capacity }
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public func has(_ index: EntityIndex) -> Bool {
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return sparse[index] ?? Int.max < count &&
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dense[sparse[index]!] != nil
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}
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public func add(_ element: Element, at index: EntityIndex) {
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if has(index) { return }
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sparse[index] = count
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let entry: Pair = Pair(key: index, value: element)
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dense.append(entry)
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size += 1
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}
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public func get(at entityIdx: EntityIndex) -> Element? {
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guard has(entityIdx) else { return nil }
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return dense[sparse[entityIdx]!]!.value
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}
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public func remove(at index: EntityIndex) {
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guard has(index) else { return }
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let compIdx: ComponentIdx = sparse[index]!
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let lastIdx: ComponentIdx = count-1
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dense.swapAt(compIdx, lastIdx)
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sparse[index] = nil
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let swapped: Pair = dense[compIdx]!
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sparse[swapped.key] = compIdx
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_ = dense.popLast()!!
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size -= 1
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if size == 0 {
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clear(keepingCapacity: false)
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}
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}
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public func clear(keepingCapacity: Bool = false) {
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size = 0
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dense.removeAll(keepingCapacity: keepingCapacity)
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sparse.removeAll(keepingCapacity: keepingCapacity)
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}
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}
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extension SparseSet: Sequence {
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public func makeIterator() -> AnyIterator<Element> {
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var iterator = dense.makeIterator()
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return AnyIterator<Element> {
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iterator.next()??.value
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}
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}
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}
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public class SparseComponentSet: SparseSet {
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public typealias Element = Component
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public typealias Index = EntityIndex
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}
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