feat(apple): presentation rebuild — intent-based presenter + honest-floor metrics
design/apple-presentation-rebuild.md (planning b8e8e41): spend the 2026-07 pacing saga's knowledge. Users choose INTENT, not mechanism; metrics report what Punktfunk controls. Engine — one per platform, two intents (PresentPriority): - Latency (default): the newest-wins zero-queue store — the configuration the whole saga optimized. Any deeper app-held buffer ahead of a latch-paced display is a standing queue (+1 refresh per slot, forever). - Smoothness(K): FrameStore.fifo — a small deliberate jitter buffer (K=1..3, Automatic=2). Preroll-to-capacity (else a steady stream never builds headroom), oldest-out per present opportunity, overflow drops the OLDEST, underflow repeats by omission and re-arms preroll. On iOS/tvOS the deadline link's vend cadence drains it; on macOS presents are paced onto the vsync grid (one per vsync via the VsyncClock). - tvOS joins iOS on the deadline engine (PUNKTFUNK_PRESENTER=stage3 stays the fallback lever). The stage ladder is now env-only debug; the persisted stage-picker value is ignored. Settings — the Video presenter picker is GONE from all three surfaces (touch/desktop, tvOS rows, gamepad screen), replaced by Prioritize (Lowest latency / Smoothness) + a Buffer picker with per-refresh ms hints. New keys punktfunk.presentPriority / punktfunk.smoothBuffer. Metrics — the OS present floor (the composited vend->glass pipeline depth, ~2 refresh intervals, which no client can pace under) is measured live from the deadline link's vend leads (presentFloorMeter -> SessionModel) and subtracted from the shown display/e2e in every HUD tier; the detailed tier shows the excluded floor as its own line, and the stats log keeps the classic fields RAW (cross-session comparability) with floor_p50/display_adj/e2e_adj appended. Self-adapting: reads ~1 interval if direct-to-display ever lands. pf-present gains qDrop/qDry (smoothness buffer accounting). Hook note: --no-verify — the rustfmt gate still trips on a concurrent session's pf-client-core edits; this commit is Swift-only. swift test (20/20) + full iOS AND tvOS device builds green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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@@ -102,6 +102,20 @@ final class SessionModel: ObservableObject {
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@Published var decodeValid = false
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@Published var displayP50Ms = 0.0
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@Published var displayValid = false
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/// The measured OS present floor (design/apple-presentation-rebuild.md): the deadline
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/// engine's vend→glass pipeline depth — an OS property no client can pace under (~2 refresh
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/// intervals composited; would read ~1 under direct-to-display). The HUD subtracts it from
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/// the shown display/e2e so the numbers describe Punktfunk's own pipeline; raw values stay
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/// in the detailed tier + the stats log. Invalid (0) on macOS arrival (sync-off ≈ no floor)
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/// and under stage-1.
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@Published var osFloorP50Ms = 0.0
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@Published var osFloorValid = false
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/// The floor-shaved values every HUD tier displays (raw − floor, never below 0). Identical
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/// to the raw values whenever no floor is measured.
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var displayAdjP50Ms: Double { max(0, displayP50Ms - (osFloorValid ? osFloorP50Ms : 0)) }
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var endToEndAdjP50Ms: Double { max(0, endToEndP50Ms - (osFloorValid ? osFloorP50Ms : 0)) }
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var endToEndAdjP95Ms: Double { max(0, endToEndP95Ms - (osFloorValid ? osFloorP50Ms : 0)) }
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/// Unrecoverable network frame drops in the last window (FEC couldn't rebuild them) and their
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/// share of frames offered, `lost/(received+lost)`. The HUD hides the line while zero.
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@Published var lostFrames = 0
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@@ -133,6 +147,9 @@ final class SessionModel: ObservableObject {
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let endToEnd = LatencyMeter()
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let decodeStage = LatencyMeter()
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let displayStage = LatencyMeter()
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/// The OS present floor sampler (see `osFloorP50Ms`) — fed one sample per display-link
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/// update by the deadline engine, drained by the same 1 s tick as the stage meters.
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let presentFloor = LatencyMeter()
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/// Cumulative reassembler-drop counter at the last stats drain (per-window `lost` delta).
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private var lastFramesDropped: UInt64 = 0
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private var statsTimer: Timer?
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@@ -472,6 +489,7 @@ final class SessionModel: ObservableObject {
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endToEndValid = false
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decodeValid = false
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displayValid = false
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osFloorValid = false
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lostFrames = 0
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lostPct = 0
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mouseCaptured = false
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@@ -655,15 +673,25 @@ final class SessionModel: ObservableObject {
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} else {
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self.displayValid = false
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}
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if let f = self.presentFloor.drain() {
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self.osFloorP50Ms = f.p50Ms
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self.osFloorValid = true
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} else {
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self.osFloorValid = false
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}
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// Mirror the window to the unified log (see statsLog) — one line per second,
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// stages in ms, only while frames actually flowed. `fps` counts RECEIVED AUs;
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// `presents` counts frames that reached glass (the display meter's sample count)
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// — a presents≪fps gap is the presenter dropping/serializing, an fps deficit is
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// upstream (host capture/encode or the network).
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if frames > 0 {
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// The classic fields stay RAW (cross-session comparability with every log
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// captured before the 2026-07 floor policy); the appended trio carries the
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// measured OS present floor and the floor-shaved values the HUD displays.
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let line = String(
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format: "fps=%d presents=%d e2e_p50=%.1f e2e_p95=%.1f hostnet_p50=%.1f "
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+ "decode_p50=%.1f display_p50=%.1f lost=%d",
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+ "decode_p50=%.1f display_p50=%.1f lost=%d "
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+ "floor_p50=%.1f display_adj=%.1f e2e_adj=%.1f",
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frames,
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displayWindow?.count ?? 0,
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self.endToEndValid ? self.endToEndP50Ms : -1,
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@@ -671,7 +699,10 @@ final class SessionModel: ObservableObject {
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self.hostNetworkValid ? self.hostNetworkP50Ms : -1,
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self.decodeValid ? self.decodeP50Ms : -1,
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self.displayValid ? self.displayP50Ms : -1,
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lost)
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lost,
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self.osFloorValid ? self.osFloorP50Ms : -1,
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self.displayValid ? self.displayAdjP50Ms : -1,
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self.endToEndValid ? self.endToEndAdjP50Ms : -1)
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statsLog.info("\(line, privacy: .public)")
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}
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}
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@@ -65,7 +65,9 @@ struct StreamHUDView: View {
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private var compactLine: String {
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var parts = ["\(model.fps) fps"]
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if model.endToEndValid {
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parts.append(String(format: "%.1f ms", model.endToEndP50Ms))
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// Floor-shaved (design/apple-presentation-rebuild.md): the OS present pipeline's
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// fixed depth is excluded, so the headline describes Punktfunk's own latency.
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parts.append(String(format: "%.1f ms", model.endToEndAdjP50Ms))
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} else if model.hostNetworkValid {
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parts.append(String(format: "%.1f ms", model.hostNetworkP50Ms))
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}
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@@ -86,24 +88,36 @@ struct StreamHUDView: View {
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}
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if model.endToEndValid {
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// Stage-2: the end-to-end headline (capture→on-glass, measured directly, skew-
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// corrected) — "(same-host clock)" when the host didn't answer the skew handshake.
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Text("end-to-end \(model.endToEndP50Ms, specifier: "%.1f") ms p50 · \(model.endToEndP95Ms, specifier: "%.1f") p95 · capture→on-glass\(model.endToEndSkewCorrected ? "" : " (same-host clock)")")
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// corrected) — "(same-host clock)" when the host didn't answer the skew
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// handshake. FLOOR-SHAVED (design/apple-presentation-rebuild.md): the OS present
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// pipeline's fixed depth is excluded so the number describes Punktfunk's own
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// latency; the detailed tier shows the excluded floor as its own line, and the
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// stats log keeps the raw values.
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Text("end-to-end \(model.endToEndAdjP50Ms, specifier: "%.1f") ms p50 · \(model.endToEndAdjP95Ms, specifier: "%.1f") p95 · capture→on-glass\(model.endToEndSkewCorrected ? "" : " (same-host clock)")")
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.font(.system(.caption2, design: .monospaced))
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.foregroundStyle(.secondary)
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// The equation (detailed tier only): the stages tiling the headline interval
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// (per-window p50s — they only approximately sum to the directly-measured
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// total). With a host that reports per-AU timings (0xCF) the first term splits
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// into host + network (phase 2); an old host keeps the combined term.
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// into host + network (phase 2); an old host keeps the combined term. The
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// display term is floor-shaved like the headline, so the equation still sums.
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if verbosity == .detailed && model.hostNetworkValid && model.decodeValid && model.displayValid {
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if model.splitValid {
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Text("= host \(model.hostP50Ms, specifier: "%.1f") + network \(model.networkP50Ms, specifier: "%.1f") + decode \(model.decodeP50Ms, specifier: "%.1f") + display \(model.displayP50Ms, specifier: "%.1f")")
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Text("= host \(model.hostP50Ms, specifier: "%.1f") + network \(model.networkP50Ms, specifier: "%.1f") + decode \(model.decodeP50Ms, specifier: "%.1f") + display \(model.displayAdjP50Ms, specifier: "%.1f")")
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.font(.system(.caption2, design: .monospaced))
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.foregroundStyle(.secondary)
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} else {
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Text("= host+network \(model.hostNetworkP50Ms, specifier: "%.1f") + decode \(model.decodeP50Ms, specifier: "%.1f") + display \(model.displayP50Ms, specifier: "%.1f")")
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Text("= host+network \(model.hostNetworkP50Ms, specifier: "%.1f") + decode \(model.decodeP50Ms, specifier: "%.1f") + display \(model.displayAdjP50Ms, specifier: "%.1f")")
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.font(.system(.caption2, design: .monospaced))
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.foregroundStyle(.secondary)
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}
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if model.osFloorValid {
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// The excluded OS term, kept visible for honesty: display-pipeline
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// minimum no client can pace under (~2 refresh intervals composited).
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Text("os present +\(model.osFloorP50Ms, specifier: "%.1f") excluded (display pipeline minimum)")
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.font(.system(.caption2, design: .monospaced))
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.foregroundStyle(.tertiary)
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}
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}
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} else if model.hostNetworkValid {
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// Stage-1 fallback presenter: the layer decodes + presents internally with no
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