| 1 | import SwiftUI |
| 2 | |
| 3 | // 🤖 The brand smoke-and-motes scene as a standalone, self-driving surface — |
| 4 | // the same scene as web's bootscene.js (the home loader / ambient haze). The |
| 5 | // particle system itself lives in CreateSpaceView.swift (AmbientField + |
| 6 | // AmbientCanvas, "home's bootscene, the quiet sibling"); this wrapper adds |
| 7 | // only a driver so any transition can drop the scene in without borrowing the |
| 8 | // create-space model. First use: iOS's space switch fades through it while |
| 9 | // the next space's chats load. The Mac could adopt it later (its sidebar + |
| 10 | // detail switch is a different shape). |
| 11 | public struct SmokeSceneView: View { |
| 12 | @StateObject private var driver = SmokeSceneDriver() |
| 13 | |
| 14 | public init() {} |
| 15 | |
| 16 | public var body: some View { |
| 17 | // Measured full-bleed so motes genuinely rise from below the physical |
| 18 | // screen edge (the same lesson as CreateSpaceView's stage sizing). |
| 19 | GeometryReader { geo in |
| 20 | AmbientCanvas(field: driver.field, tick: driver.tick) |
| 21 | .onAppear { |
| 22 | driver.size = geo.size |
| 23 | driver.start() |
| 24 | } |
| 25 | .onChange(of: geo.size) { _, s in driver.size = s } |
| 26 | .onDisappear { driver.stop() } |
| 27 | } |
| 28 | .allowsHitTesting(false) |
| 29 | .ignoresSafeArea() |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | /// The scene's 60Hz heartbeat. An explicit Timer, not TimelineView(.animation), |
| 34 | /// for the same reason CreateSpaceModel drives its sim with one: TimelineView |
| 35 | /// silently stopped ticking on device and the smoke froze. The published tick |
| 36 | /// is what forces the Canvas to redraw (the field is a class — an identical |
| 37 | /// reference frame-to-frame would skip the redraw). |
| 38 | @MainActor |
| 39 | final class SmokeSceneDriver: ObservableObject { |
| 40 | @Published private(set) var tick = 0 |
| 41 | let field = AmbientField() |
| 42 | var size: CGSize = .zero |
| 43 | private var timer: Timer? |
| 44 | private var lastT: TimeInterval? |
| 45 | |
| 46 | func start() { |
| 47 | guard timer == nil else { return } |
| 48 | let t = Timer(timeInterval: 1.0 / 60, repeats: true) { [weak self] _ in |
| 49 | MainActor.assumeIsolated { |
| 50 | guard let self else { return } |
| 51 | let now = Date().timeIntervalSinceReferenceDate |
| 52 | let dt = min(0.1, max(0, now - (self.lastT ?? now))) |
| 53 | self.lastT = now |
| 54 | self.field.step(dt: dt, size: self.size) |
| 55 | self.tick &+= 1 |
| 56 | } |
| 57 | } |
| 58 | // .common so the scene keeps drifting through any gesture tracking. |
| 59 | RunLoop.main.add(t, forMode: .common) |
| 60 | timer = t |
| 61 | } |
| 62 | |
| 63 | func stop() { |
| 64 | timer?.invalidate() |
| 65 | timer = nil |
| 66 | lastT = nil |
| 67 | } |
| 68 | } |
| 69 | |
amadan