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# Symph: Architecture & Design Specification
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## System Abstract
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Symph is a rhythm-driven grid traversal game. Real-time spatial mechanics are
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synchronized against a quantized temporal progression. The engine decouples
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hardware-frequency rendering and input polling from macro-frequency musical
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progression, exposing a deterministic, side-effect-free state machine to
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Terminal, Raylib, and Mobile frontends.
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---
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## 1. Domain Nomenclature
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* **Symphony** *(planned)*: collection of Songs.
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* **Song**: master temporal container (Z-axis). Slice of `Chord`.
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* **Chord**: one slice in time. A 3x3 matrix of `Note`.
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* **Note**: atomic element at `(Y, X)`, carrying a `Value`.
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* **Symphace** *(planned)*: bounded environment surrounding the grid.
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---
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## 2. Coordinate System & Displacement
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* **PIZ**: temporal depth index. Advances on the beat.
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* **PIY, PIX**: grid coordinates, bounded to `[0, 2]`. Spawn/rest anchor `(1, 1)`.
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Movement is decoupled from `PIZ`.
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* **X (lanes)**: persistent. The player holds the lane until moved again.
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* **Y (rows)**: transient. A row shift arms `ResetTime` at
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`PlayerRowResetChords * PlayDeltaZ`, rescaled on every tempo change, so the
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landing chord is invariant across levels and across a Boost. On expiry, Y
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collapses to `BaseIndexY` and the landing cell is resolved — returning into a
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wall is fatal.
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A manual move back to the base row cancels the timer (duck out of a jump).
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* Cells resolve on three triggers: beat arrival, player movement, row-reset
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landing.
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---
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## 3. Phases
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`PhasePlaying` → `PhaseLevelClear` (song exhausted, `TransitionDuration`
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interlude, then next level) → `PhasePlaying`.
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`PhaseGameOver` on wall contact; `ActionConfirm` restarts from level 1.
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Input is inert during `PhaseLevelClear`. `Pause`/`Resume` shift every absolute
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timestamp forward by the paused span, so no beats or row-reset expiries
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accumulate behind a pause (used by the terminal viewport gate).
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A deadline already lapsed when the dead span opened is cleared, not shifted:
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dead time never revives a Boost, extends a row reset, or replays a burn-out.
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---
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## 4. Chronometry & Concurrency
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Two isolated time domains:
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* **Macro (beat)**: `PlayDeltaZ`. Elapsed spans are consumed in whole ticks;
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`LastPlayedTime` advances by whole intervals, never by `now` — no drift.
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* **Micro (render/input)**: host framerate (`GameRenderUpdate`, ~60Hz).
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Resolves sub-beat state: row-reset countdown, blink phase, morph colors.
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### Tempo
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* `BaseDeltaZ` — level-derived: `GameDeltaZBase` (500ms), shortened by
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`GameDeltaZStep` per level down to `GameDeltaZMin`.
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* `deltaAt(t)` — `BaseDeltaZ / BoostSpeedFactor` while a Boost runs at `t`, else
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`BaseDeltaZ`. The only place tempo is scaled; a slow effect divides here.
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* `PlayDeltaZ` — the interval of the beat **in flight**, fixed at that beat's
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start. A Boost taken mid-chord lands on the next boundary: the chord under the
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player never shortens beneath them.
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* `Update` re-reads the interval at each boundary, so a Boost expiring inside a
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frame is exact. `TimeToChordDistance` replays the recurrence forward, so every
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displayed countdown matches the simulation.
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### Pipeline
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Single-threaded polling loop. No mutexes, no channels over game state.
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* A `time.Ticker` injects synthetic wake-up events (`terminal.KeyNone`) into
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the frontend event queue; raylib polls its own frame loop.
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* Per iteration: translate native key → `input.Key` → `game.Action`,
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`Dispatch(action, now)`, `Update(now)`, `DrainEvents()`, render.
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* Host controls bypass `input`/`game`: quit (Esc / Ctrl+C / `q`) and the audio
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gate (Ctrl+S) are handled in `cmd/`. They must work while paused and in every
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phase, which `Dispatch` does not allow. `audio.Muter` wraps an `Engine` and
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drops `Play` while muted; the header carries `MUTE`.
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* The engine emits no side-effects. Gameplay occurrences are queued as `Event`
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enums and drained once per iteration by the frontend, which maps them to
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audio.
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---
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## 5. Values & Items
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Every `Value` has one row in `types.valueSpecs` — `{Name, Glyph, Polarity}` —
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which is the single source of truth for kind identity. `Glyph` is the pattern
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authoring rune *and* the ASCII display fallback; `init` asserts completeness,
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ASCII range and uniqueness at process start. `Polarity` is a table lookup, not
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a switch.
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| Value | Glyph | Polarity | Behavior |
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|---|---|---|---|
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| `ValueEnergy` | `*` | positive | +1 energy, consumed on contact |
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| `ValueMagnet` | `M` | positive | consumed; sweeps **every** Energy note within `PositionLookaheadWindow` chords, at all 9 grid positions |
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| `ValueShield` | `S` | positive | consumed; arms `ShieldCharges` absorb charges. No expiry |
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| `ValueBoost` | `B` | positive | consumed; arms `BoostDuration` of `BoostSpeedFactor`× tempo. Refreshes, does not stack |
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| `ValueWall` | `#` | negative | fatal, unless a charge absorbs it |
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Adding a kind is three rows: `types.valueSpecs` (identity),
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`game.resolvers` (contact behavior), `render.valueVisuals` (color ramp).
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No switch is edited. `parseChord` rejects any pattern authoring a kind with no
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resolver, so an unresolved kind can never be walked through.
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### 5.1 Status
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`game.Status` holds the persistent player effects. Both survive a level change;
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both are cleared on restart, never on death-free level transition.
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* **Shield** — a charge count. `hitHazard` spends one charge, **destroys the
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note**, records it in the consume ring, and play continues: the lookahead,
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ring and timer all re-derive from the cleared cell, giving the player exactly
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one beat to leave the lane. Because absorption sits in `resolveCell`, it
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covers all three resolution triggers (beat arrival, movement, row-reset
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landing) with no second code path.
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* **Boost** — an absolute deadline. Read only at beat boundaries.
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`Status.shift(at, d)` moves **live** deadlines across a pause and across the
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level-clear interlude, so a Boost taken at a song's tail is not burned by the
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transition wave. `at` is the instant the dead span opened; a deadline already
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lapsed at `at` is cleared, never revived. `restart` zeroes the whole `Status`.
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---
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## 6. Lookahead Model
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`ScanTile(y, x, window)` returns a `TileLookahead` for one grid position,
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allocation-free, in a single pass:
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* `Cells` — raw `Value` per chord distance (0 = current chord).
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* `WallMask` — `uint16` bitmask, bit *d* set when distance *d* holds a wall.
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`TileLookaheadMaxWindow` = 16 is the hard ceiling on the window.
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* `Positive` / `Negative` — nearest occurrence per polarity class.
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* `NearestWall()` derives the leading wall segment (distance, run length,
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reopen gap, trap flag, open-ended flag) from the bitmask.
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All proximity, run, gap and trap **policy** derives from the bitmask in the
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frontend. The engine holds no presentation rules.
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---
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## 7. Presentation Contract (terminal)
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Tile, 12x5:
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* **border** — ring colored by nearest-wall band (`WallBandCount` bands of
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`WallBandSize` chords). Fill is binary: solid only when a wall occupies the
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current chord. Urgency rides on color, not density.
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* **header row** — `LEVEL` left, active status (shield glyph, boost countdown)
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centered, `ENERGY` right.
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* **row 1** — wall timer. `▼` chords until the lane shuts, `▲` until it
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reopens; `+` open-ended run, `!` trap gap (`<= TrapGapMax`).
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* **row 2** — distance row: nearest positive and nearest negative occurrence,
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each glyph + chord-distance. The tile(s) whose distance equals the
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**grid-wide** minimum for that polarity blink their group
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(positive: white/green, negative: yellow/red, `RenderBlinkPeriod`). Ties are
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not broken — every tile at the minimum blinks. Distance 0 counts.
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* **row 3** — lookahead strip: one cell per chord, leftmost = now.
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Distance is carried positionally, so items draw at arrived color;
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walls keep the band gradient so ring, timer and strip agree.
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A cell emptied by consumption burns out in place:
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white flash, then glyph collapse into the rail cell.
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Grid-scope scan (`render.GridScan`) and the burn-out projection
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(`render.FadeGrid`) are shared by both frontends; policy lives in `render`.
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* **background** — player position fill; brightened while a charge is held, so
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the shield reads in the field rather than only in the HUD.
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Item color ramps use high-luminance endpoints at both ends: the distance row
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draws items at their true distance, and a dark distant endpoint is unreadable
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against the black field.
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**Raylib**: same contract, different medium. Layout derives from two gap
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fractions — `gapFracX` (usable width) and `gapFracY` (tile height). The row gap
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hosts the reset funnel, so the funnel font is sized against it (`funnelFrac`,
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floored at `funnelFontMin`).
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---
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## 8. Package Topology
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Unidirectional dependency flow (supports CGO/gomobile).
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* `types/` — dependency-free structures (`Song`, `Chord`, `Note`,
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`PlayerState`) and the value registry (`valueSpecs`: identity, glyph,
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polarity). Breaks import cycles.
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* `parameter/` — compile-time constants: grid bounds, timings, glyphs, tile
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geometry, lookahead window. Several invariants are enforced by `const _`
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assertions (window vs bitmask width, window vs band span, density glyphs vs
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band count).
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* `game/` — pure state engine. Contact behavior is the `resolvers` table keyed
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on `Value`; `Status` holds persistent item effects.
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* `input/` — native key → platform-neutral `Key` → `game.Action`. The
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gomobile path bypasses this package and produces `Action` directly.
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* `render/` — appearance is the `valueVisuals` table keyed on `Value`.
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`TileGlyphASCII` is the atlas-limited substitution for raylib.
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`render/raylib/` shares the `render` caching pipeline and is up-to-date with the `TileLookahead` API.
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* `audio/` — fire-and-forget effects. PCM synthesized at startup; PipeWire
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backend on Linux, silent `nullEngine` elsewhere or when `pw-play` is absent.
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`Muter` composes an `Engine` with the host mute gate.
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* `cmd/` — hosts (`symph-term`, `symph-raylib`): wiring, event poller, ticker.
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---
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## 9. Known Divergences
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* Raylib substitutes ASCII for the Unicode glyph set (default font atlas is
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32..126) and draws walls as rectangles rather than density glyphs.
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Load a font with an explicit codepoint set for glyph parity.
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* `audio` spawns one `pw-play` process per effect; per-spawn stream connect
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costs tens of ms. Replace with a persistent stream before latency matters.
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* FreeBSD audio backend (sndio/OSS) unimplemented — falls through to
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`nullEngine`.
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* **Boost expiry inside a wall band is the primary death mode.** `resolveCell`
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fires on beat arrival, so a boosted player standing in a wall when the
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deadline lapses dies on the next beat — one chord (>= 150ms) to leave the
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lane. The HUD blink is the only warning. Intentional.
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* **Walls still render lethal while boosted.** Ring, timer and strip are
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unaware of immunity; recoloring requires threading `Status` through
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`WallBandColor` / `TileGlyph` / `WallTimerText`. Deferred.
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* **Boost shares the warm end of the wall band palette** (`PaleLemon → Gold` vs
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`Yellow → BrightRed`). Glyph and fixed distance-row column disambiguate.
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* `EventDeflect` fires once per walled chord traversed; with the `pw-play`
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backend that is one process spawn per chord during a boosted wall run.
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* `ItemFadeDuration` (140ms) clears the boosted beat floor
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(`GameDeltaZMin/BoostSpeedFactor` = 150ms) by 10ms. Lower it to ~100ms before
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touching either constant.
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* `TimerText` clamps at 9.9s, so a fresh 10s Boost reads `9.9` for its first
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100ms.
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