90 lines
5.1 KiB
Markdown
90 lines
5.1 KiB
Markdown
# LANE-JUICE — Audio Engine & UI Widgets (Phase 1, parallel)
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**Executor:** Opus 4.8. **Branch:** `lane/juice` (from main after Phase 0 merge).
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**Owns:** `src/audio/`, `src/ui/` + tests. **Prereq reading:** `docs/GAME_DESIGN.md`
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§5 → `docs/CONTRACTS.md` §4 (beat + audio events) → `LANEHANDOVER.md`.
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You build the two things every other lane will lean on: the sound of the game and
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the reusable UI widgets. Everything must work in your own demo scenes with zero
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imports from door/floor code.
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## Deliverable
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`JuiceDemoScene` (menu key J): buttons that exercise every widget and every SFX,
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plus the techno engine playing with a big on-screen low-pass cutoff slider and a
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DOOR/FLOOR toggle. Beat indicator flashes on `beat:tick` and visibly matches the
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audio.
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## Part A — Audio (`src/audio/`) — raw WebAudio, no libraries
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### 1. `TechnoEngine.ts` — the looping track
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Fully synthesized, no samples: kick (sine drop 150→50Hz, ~8ms attack) four-on-the-
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floor at 126–132 BPM (config), off-beat hi-hat (filtered noise burst), a 2-bar
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16th-note bassline (detuned saw through its own low-pass), an 8-bar pad that fades
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in/out on a slow cycle. Schedule with the **look-ahead pattern** (timer checks
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every 25ms, schedules nodes ~100ms ahead on `AudioContext.currentTime`) — never
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schedule audio from rAF or Phaser update.
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- **Beat authority:** emit `beat:tick {beatIndex, audioTimeMs}` on the EventBus AT
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SCHEDULING TIME with the scheduled audio timestamp (consumers compare against
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it — this is what makes the toilet rhythm game honest). On integration your
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engine replaces `core/StubBeatClock` — same event, so consumers don't change.
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- **The location filter (the signature):** master bus → `BiquadFilterNode`
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(lowpass). `audio:location: 'door'` → cutoff ~250Hz + slight volume dip +
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a touch of muffled reverb-ish feel (a short convolver is optional; the filter
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alone is 90% of it). `'floor'` → sweep open to ~18kHz over ~600ms. That sweep IS
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the "walking through the door" moment — make the ramp feel like a door opening,
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exponential not linear.
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- AudioContext unlock on first user gesture (browser autoplay policy); engine
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boots silent until then, beat events start with audio, not before.
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### 2. `Sfx.ts` — synthesized one-shots
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All procedural (noise bursts, filtered clicks, pitch envelopes). Required set,
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each with a named function:
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`stampSlam` (heavy thunk + paper snap) · `stampInk` (squelch) · `clickerClunk`
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(mechanical double-click) · `doorBang` (for the toilet game — must cut through the
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muffled mix) · `radioStatic` + `radioChirp` · `phoneBuzz` · `ropeUnhook` (chain
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jingle) · `denyCrowdOoh` (small crowd murmur from filtered noise) · `rainLoop`
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(ambient, door scene). Route SFX AROUND the location filter (UI sounds are always
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crisp; only the music is muffled).
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## Part B — UI widgets (`src/ui/`) — reusable Phaser containers
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Each widget: self-contained container class, configurable position, emits/consumes
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bus events, demo'd in JuiceDemoScene. Style: chunky pixel UI, high contrast,
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slightly grubby (this club is not clean).
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1. **`Stamp.ts`** — THE interaction. `stamp(scene, {text: 'DENIED', onSlam})`:
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raised stamp follows a short arc, SLAMS with 4px screen shake, ink ring +
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splatter decal that stays on the patron, dust particles, `stampSlam` +
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`stampInk` sfx, tiny hang before release. Tune until it feels like closing a
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argument. Also a green `ADMITTED`-capable variant (config text/colour).
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2. **`Phone.ts`** — bottom-corner phone: buzz animation + `phoneBuzz` on
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`dazza:text`, message preview toast, click → slide-up thread history with
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typing-dots for incoming. Also the "look at phone" idle interaction (emits
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`door:phoneTheatre` — add to EventMap as a juice-domain event).
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3. **`DialogueBox.ts`** — bottom-third dialogue with typed-out text (per-char
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tick sfx), speaker tag, 2–4 choice buttons, drunk-typo render mode (letters
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wobble/swap for drunk speakers). Consumed by both door tests and floor cut-offs.
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4. **`Clicker.ts`** — the capacity tally: chunky physical counter, big IN button,
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small OUT button, mechanical digit-roll animation, `clickerClunk`. Emits
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`door:clicker`.
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5. **`MeterHud.ts`** — Vibe/Aggro/Hype bars listening to `meters:changed`: vibe as
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a neon sign that flickers when low, aggro as a crowd-temperature strip that
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pulses when high, heat as 3 licence-stamp slots. Replaces core's HudStub at
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integration.
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## Constraints
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- No imports from `scenes/door/` or `scenes/floor/`. Widgets learn everything from
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constructor config + bus events.
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- New event names go in the EventMap via CONTRACT CHANGE REQUEST if outside the
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audio domain (`beat:*`, `audio:*` are yours to extend freely).
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- Pure-logic tests where they exist (beat scheduling math: given BPM + lookahead,
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assert scheduled beat times; typo-renderer determinism). Audio nodes themselves
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need only the demo scene — note in handover what was verified by ear.
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## Definition of done
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JuiceDemoScene exercises everything; beat flash visibly locks to audio; the
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door→floor filter sweep feels right (describe your tuning in the handover);
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`lint`/`build`/`test` clean; SESSION block appended to LANEHANDOVER.md; branch pushed.
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