| 1 | //! Ambient ocean life for the underwater transcript field. |
| 2 | //! |
| 3 | //! One clear owner for the fish school, jellyfish, bubbles, and the rare |
| 4 | //! whale cameo — nothing else lives in the water (2026-07-23 product |
| 5 | //! decision: seaweed and bio-dust are gone). Motion stays inside the |
| 6 | //! existing delta/interpolation path: this module never requests frames on |
| 7 | //! its own. |
| 8 | //! |
| 9 | //! Motion language (shared with the rest of the shell): every mark can lerp |
| 10 | //! between the water and its ink at a time-varying brightness. Fish carry a |
| 11 | //! travelling sin² wave, jellyfish a slow band-bounded pulse that opens and |
| 12 | //! closes the dome while the tentacles trail it by ~0.6 s, bubbles an |
| 13 | //! occasional raised-cosine glint. Phases are wall-clock keyed and entity |
| 14 | //! periods deliberately never match, so nothing strobes in sync. |
| 15 | //! |
| 16 | //! The jellyfish is a *visitor*, not scenery: one at most, present for roughly |
| 17 | //! a fifth of a ~5-minute cycle and dimmer than everything around it. See the |
| 18 | //! `JELLY_VISIT_*` constants for the rarity knobs and why they are set where |
| 19 | //! they are. |
| 20 | //! |
| 21 | //! Fish swim on a wrap-around path: they exit one edge and re-enter the |
| 22 | //! other still facing their travel direction, so facing always equals |
| 23 | //! velocity by construction. Direction may only change while the school is |
| 24 | //! fully off-screen. |
| 25 | //! |
| 26 | //! Two clocks feed this module and neither is a token counter. Positions ride |
| 27 | //! `App::sample_ambient_clock_ms`, which advances by real elapsed time clamped |
| 28 | //! to `App::AMBIENT_MAX_STEP_MS` per draw, so drift speed is identical at 16 ms |
| 29 | //! and 33 ms frames and a stalled-then-resumed frame cannot jump a creature. |
| 30 | //! Sideways *placement*, by contrast, is a function of the transcript text |
| 31 | //! under the silhouette — which does change with token throughput — so it is |
| 32 | //! bounded by [`JELLY_MAX_TEXT_DODGE_COLS`]. |
| 33 | //! |
| 34 | //! Under reduced motion there is no ambient life at all: `ocean::life_presence` |
| 35 | //! returns 0 and [`paint_marks`] returns before writing a cell. Marks are still |
| 36 | //! *built* (the budget counters stay honest), just never painted. |
| 37 | //! |
| 38 | //! `render_ambient_life` returns per-frame budget counters |
| 39 | //! ([`AmbientFrameStats`]): marks built always splits exactly into painted + |
| 40 | //! text-skipped + clipped. Counting is a handful of `u32` increments — no |
| 41 | //! allocation, no frame requests. |
| 42 | |
| 43 | use ratatui::{ |
| 44 | buffer::Buffer, |
| 45 | layout::Rect, |
| 46 | style::{Color, Modifier, Style}, |
| 47 | text::Line, |
| 48 | }; |
| 49 | use unicode_width::{UnicodeWidthChar, UnicodeWidthStr}; |
| 50 | |
| 51 | use crate::tui::ocean::{self, OceanColumn}; |
| 52 | |
| 53 | /// Depth layers for parallax. Nearer life is larger, faster, and more visible. |
| 54 | #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| 55 | enum Depth { |
| 56 | Background, |
| 57 | Midground, |
| 58 | Foreground, |
| 59 | } |
| 60 | |
| 61 | impl Depth { |
| 62 | #[must_use] |
| 63 | fn ink_index(self) -> usize { |
| 64 | match self { |
| 65 | Self::Background => 1, |
| 66 | Self::Midground | Self::Foreground => 0, |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | /// Creature density tier mirrored from shell width/height. |
| 72 | #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| 73 | pub enum LifeDensity { |
| 74 | Sparse, |
| 75 | Normal, |
| 76 | Rich, |
| 77 | } |
| 78 | |
| 79 | impl LifeDensity { |
| 80 | #[must_use] |
| 81 | pub fn from_area(area: Rect) -> Self { |
| 82 | if area.width < 56 || area.height < 12 { |
| 83 | Self::Sparse |
| 84 | } else if area.width < 88 || area.height < 20 { |
| 85 | Self::Normal |
| 86 | } else { |
| 87 | Self::Rich |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | #[must_use] |
| 92 | fn school_size(self) -> usize { |
| 93 | // One loose wedge of real fish; two schools compete with the whale. |
| 94 | match self { |
| 95 | Self::Sparse => 3, |
| 96 | Self::Normal => 5, |
| 97 | Self::Rich => 7, |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | #[must_use] |
| 102 | fn jellyfish_count(self) -> usize { |
| 103 | // At most one jellyfish in the water at a time, at every tier. Two |
| 104 | // put a pulsing silhouette in *both* side lanes, which is what made |
| 105 | // them read as resident scenery instead of a passing visitor. The |
| 106 | // rarity knob that matters is the visit duty cycle |
| 107 | // ([`JELLY_VISIT_CYCLE_SLOTS`]), not the population. |
| 108 | match self { |
| 109 | Self::Sparse | Self::Normal | Self::Rich => 1, |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | #[must_use] |
| 114 | fn bubble_streams(self) -> usize { |
| 115 | match self { |
| 116 | Self::Sparse => 1, |
| 117 | Self::Normal => 2, |
| 118 | Self::Rich => 2, |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /// Lower floors so smaller windows still retain some life (was 68×15). |
| 124 | /// Keep in sync with [`crate::tui::ocean::AMBIENT_MIN_WIDTH`]. |
| 125 | pub const AMBIENT_MIN_WIDTH: u16 = crate::tui::ocean::AMBIENT_MIN_WIDTH; |
| 126 | pub const AMBIENT_MIN_HEIGHT: u16 = crate::tui::ocean::AMBIENT_MIN_HEIGHT; |
| 127 | |
| 128 | /// Whale cameo state: brief breach → spout → fluke → submerge. |
| 129 | #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| 130 | pub enum WhaleCameoPhase { |
| 131 | Hidden, |
| 132 | Breach, |
| 133 | Spout, |
| 134 | Fluke, |
| 135 | Submerge, |
| 136 | } |
| 137 | |
| 138 | /// Snapshot of ambient positions for one frame (memoized once per draw). |
| 139 | #[derive(Debug, Clone)] |
| 140 | struct FrameMarks { |
| 141 | marks: Vec<AmbientMark>, |
| 142 | } |
| 143 | |
| 144 | #[derive(Debug, Clone, Copy)] |
| 145 | struct AmbientMark { |
| 146 | x: u16, |
| 147 | y: u16, |
| 148 | glyph: &'static str, |
| 149 | /// Multi-row creature identity. Every part relocates or is withheld as one |
| 150 | /// unit so a jellyfish never degrades into a detached dome or tentacles. |
| 151 | jellyfish: Option<usize>, |
| 152 | depth: Depth, |
| 153 | style_mod: Option<Modifier>, |
| 154 | /// Time-varying glow in `[0, 1]`: the mark's ink is lerped from the |
| 155 | /// painted water toward full ink at this amount. `None` renders the |
| 156 | /// plain ink (legacy behavior for the whale cameo). |
| 157 | brightness: Option<f32>, |
| 158 | } |
| 159 | |
| 160 | /// Per-frame render budget counters. `marks_built` splits exactly into |
| 161 | /// `marks_painted + marks_skipped_text + marks_clipped`. `cells_written` |
| 162 | /// counts individual cell writes: a multi-cell glyph counts each of its |
| 163 | /// cells, and two overlapping marks count the shared cell once per write. |
| 164 | #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)] |
| 165 | pub struct AmbientFrameStats { |
| 166 | pub marks_built: u32, |
| 167 | pub marks_painted: u32, |
| 168 | pub marks_skipped_text: u32, |
| 169 | pub marks_clipped: u32, |
| 170 | pub cells_written: u32, |
| 171 | } |
| 172 | |
| 173 | /// Hard upper bound on marks built in one frame: 7 fish + 1 jellyfish × 5 |
| 174 | /// parts (2 dome rows + 3 tentacles) + 2 bubbles + 2 whale-cameo cells = 16, |
| 175 | /// plus headroom. This is a test-gate ceiling asserted against |
| 176 | /// [`AmbientFrameStats::marks_built`], not a runtime clamp: the population is |
| 177 | /// bounded by construction, and this constant is what fails the build if a |
| 178 | /// future change makes it unbounded. |
| 179 | #[allow(dead_code)] |
| 180 | pub const MAX_FRAME_MARKS: u32 = 24; |
| 181 | |
| 182 | /// Optional pointer reaction for fish dart / bubble rise. |
| 183 | #[derive(Debug, Clone, Copy, Default)] |
| 184 | pub struct AmbientCursor { |
| 185 | pub column: u16, |
| 186 | pub row: u16, |
| 187 | /// When set, fish flee from this point for ~800 ms of shared ocean clock. |
| 188 | pub flee_elapsed_ms: Option<u128>, |
| 189 | } |
| 190 | |
| 191 | /// Optional whale cameo trigger (e.g. successful turn completion). |
| 192 | #[derive(Debug, Clone, Copy, Default)] |
| 193 | pub struct WhaleCameo { |
| 194 | pub elapsed_ms: Option<u128>, |
| 195 | /// Anchor column within the field (composer / center). |
| 196 | pub anchor_x: u16, |
| 197 | pub anchor_y: u16, |
| 198 | } |
| 199 | |
| 200 | const WHALE_CAMEO_MS: u128 = 2_400; |
| 201 | |
| 202 | /// Render ambient life into empty water cells of `area`. |
| 203 | /// |
| 204 | /// Returns per-frame budget counters for tests and debug tooling; the |
| 205 | /// counting itself is a few `u32` increments, never an allocation. |
| 206 | #[allow(clippy::too_many_arguments)] |
| 207 | pub fn render_ambient_life( |
| 208 | area: Rect, |
| 209 | buf: &mut Buffer, |
| 210 | inks: (Color, Color), |
| 211 | lines: &[Line<'static>], |
| 212 | elapsed_ms: u128, |
| 213 | presence: f32, |
| 214 | cursor: AmbientCursor, |
| 215 | whale: WhaleCameo, |
| 216 | ) -> AmbientFrameStats { |
| 217 | if area.width < AMBIENT_MIN_WIDTH || area.height < AMBIENT_MIN_HEIGHT { |
| 218 | return AmbientFrameStats::default(); |
| 219 | } |
| 220 | |
| 221 | let density = LifeDensity::from_area(area); |
| 222 | let mut stats = AmbientFrameStats::default(); |
| 223 | // Positions always ride the live monotonic clock; `presence` fades the |
| 224 | // marks in and out, so the animated/static boundary eases instead of |
| 225 | // snapping fish between t=0 and their mid-path positions. |
| 226 | let frame = build_frame_marks(area, elapsed_ms, density, cursor, whale, &mut stats); |
| 227 | paint_marks(area, buf, inks, lines, &frame, presence, &mut stats); |
| 228 | stats |
| 229 | } |
| 230 | |
| 231 | fn build_frame_marks( |
| 232 | area: Rect, |
| 233 | elapsed_ms: u128, |
| 234 | density: LifeDensity, |
| 235 | cursor: AmbientCursor, |
| 236 | whale: WhaleCameo, |
| 237 | stats: &mut AmbientFrameStats, |
| 238 | ) -> FrameMarks { |
| 239 | let mut marks = Vec::with_capacity(48); |
| 240 | let t = elapsed_ms; |
| 241 | |
| 242 | // Leave the empty-state brand band (center third) mostly clear so life |
| 243 | // frames the room instead of littering the hero whale + status lines. |
| 244 | let quiet_top = (area.height / 5).max(2); |
| 245 | let quiet_mid_lo = area.height.saturating_mul(2) / 5; |
| 246 | let quiet_mid_hi = area.height.saturating_mul(3) / 5; |
| 247 | |
| 248 | // --- One loose fish school on a wrap-around path --- |
| 249 | // The school enters one edge, crosses, and exits the other; direction |
| 250 | // may only change while it is fully off-screen, so facing always equals |
| 251 | // velocity. A travelling sin² brightness wave runs through the wedge. |
| 252 | let school_size = density.school_size().min(SCHOOL_WEDGE.len()); |
| 253 | let school_span = SCHOOL_WEDGE |
| 254 | .iter() |
| 255 | .take(school_size) |
| 256 | .map(|(_, dx)| *dx) |
| 257 | .max() |
| 258 | .unwrap_or(0) |
| 259 | .saturating_add(LEAD_FISH_RIGHT.len() as u16); |
| 260 | let travel = u128::from(area.width.saturating_add(school_span).max(1)); |
| 261 | let cycle_ms = travel.saturating_mul(SCHOOL_CELL_MS); |
| 262 | // Half-cycle head start: freshly opened water shows the school |
| 263 | // mid-crossing instead of an empty entry beat. |
| 264 | let school_clock = t.saturating_add(cycle_ms / 2); |
| 265 | let (cycle_index, cycle_step) = ( |
| 266 | school_clock / cycle_ms, |
| 267 | ((school_clock % cycle_ms) / SCHOOL_CELL_MS) as i32, |
| 268 | ); |
| 269 | let swims_right = school_swims_right(cycle_index); |
| 270 | // Alternate the travel band between crossings; both avoid the hero band. |
| 271 | let swims_low = school_swims_low(cycle_index); |
| 272 | let anchor_y = if swims_low { |
| 273 | area.height.saturating_mul(3) / 4 |
| 274 | } else { |
| 275 | quiet_top.saturating_add(1) |
| 276 | }; |
| 277 | let ptr = cursor.column.saturating_sub(area.x); |
| 278 | let ptr_y = cursor.row.saturating_sub(area.y); |
| 279 | for (m, (dy, dx)) in SCHOOL_WEDGE.iter().take(school_size).enumerate() { |
| 280 | let body = fish_body(swims_right, m == 0); |
| 281 | let body_w = body.len() as u16; // ASCII bodies: len == width |
| 282 | // Nose position in wrap space; trailers sit `dx` columns behind the |
| 283 | // lead relative to travel, so the wedge follows instead of leading. |
| 284 | // Right-swimmers enter from the left edge, left-swimmers from the |
| 285 | // right edge — both facing exactly the way they move. |
| 286 | let mut x_i32 = if swims_right { |
| 287 | cycle_step - 1 - i32::from(*dx) - (i32::from(body_w) - 1) |
| 288 | } else { |
| 289 | i32::from(area.width) - cycle_step + i32::from(*dx) |
| 290 | }; |
| 291 | // Slight per-fish vertical stagger + slow bob. |
| 292 | let bob = sine_bob(t, 3_400 + (m as u128) * 640, 1); |
| 293 | let mut y_i32 = i32::from(anchor_y) + i32::from(*dy) + i32::from(bob); |
| 294 | // Fish flee the pointer in both dimensions (nearby motion only). |
| 295 | if let Some(flee_ms) = cursor.flee_elapsed_ms { |
| 296 | let flee = i32::from(fish_flee_offset(flee_ms)); |
| 297 | if x_i32.abs_diff(i32::from(ptr)) < 16 && y_i32.abs_diff(i32::from(ptr_y)) < 6 { |
| 298 | if x_i32 >= i32::from(ptr) { |
| 299 | x_i32 += flee; |
| 300 | } else { |
| 301 | x_i32 -= flee; |
| 302 | } |
| 303 | if y_i32 >= i32::from(ptr_y) { |
| 304 | y_i32 += 1; |
| 305 | } else { |
| 306 | y_i32 -= 1; |
| 307 | } |
| 308 | } |
| 309 | } |
| 310 | let max_x = i32::from(area.width.saturating_sub(body_w)); |
| 311 | let max_y = i32::from(area.height.saturating_sub(1)); |
| 312 | if x_i32 < 0 || x_i32 > max_x || y_i32 < 0 || y_i32 > max_y { |
| 313 | continue; // off-screen while wrapping |
| 314 | } |
| 315 | let y = y_i32 as u16; |
| 316 | // Never swim through the hero band. |
| 317 | if y > quiet_mid_lo && y < quiet_mid_hi { |
| 318 | continue; |
| 319 | } |
| 320 | let brightness = FISH_BRIGHTNESS_FLOOR |
| 321 | + (1.0 - FISH_BRIGHTNESS_FLOOR) |
| 322 | * wave01(t, FISH_WAVE_MS, (m as u128).saturating_mul(320)); |
| 323 | marks.push(AmbientMark { |
| 324 | x: x_i32 as u16, |
| 325 | y, |
| 326 | glyph: body, |
| 327 | jellyfish: None, |
| 328 | depth: if m == 0 { |
| 329 | Depth::Foreground |
| 330 | } else { |
| 331 | Depth::Midground |
| 332 | }, |
| 333 | style_mod: None, |
| 334 | brightness: Some(brightness), |
| 335 | }); |
| 336 | } |
| 337 | |
| 338 | // --- Jellyfish: a pulsing dome with lagging tentacles --- |
| 339 | // Two dome rows (arc + bell rim) over a row of swaying |
| 340 | // tentacles. The dome opens and closes on a slow floor-bounded sin²; |
| 341 | // the tentacles repeat the pulse ~350 ms later and sway out of phase |
| 342 | // with each other — the lag is what sells "jellyfish". Rich/Normal get |
| 343 | // the full 5-cell dome with three tentacles; Sparse (narrow) swaps in a |
| 344 | // compact 3-cell dome with two — a real fallback silhouette, not just |
| 345 | // fewer jellies. They drift slowly upward through the side lanes, wrap, |
| 346 | // and park mid-rise just under the hero band under reduced motion. |
| 347 | let in_band = |row: u16| row > quiet_mid_lo && row < quiet_mid_hi; |
| 348 | for j in 0..density.jellyfish_count() { |
| 349 | let phase = 3_100u128.saturating_add((j as u128) * 4_700); |
| 350 | let lane_x = if j % 2 == 0 { |
| 351 | area.width.saturating_mul(5) / 6 |
| 352 | } else { |
| 353 | area.width / 6 |
| 354 | }; |
| 355 | let wobble = sine_bob(t, 5_200 + phase, 1); |
| 356 | let compact = density == LifeDensity::Sparse; |
| 357 | let (dome_top, dome_skirt, tentacle_cols): (&[&str], &[&str], &[u16]) = if compact { |
| 358 | (JELLY_DOME_TOP_COMPACT, JELLY_DOME_SKIRT_COMPACT, &[0, 2]) |
| 359 | } else { |
| 360 | (JELLY_DOME_TOP_FRAMES, JELLY_DOME_SKIRT_FRAMES, &[1, 2, 3]) |
| 361 | }; |
| 362 | let dome_w = dome_top[0].len() as u16; // ASCII frames: len == width |
| 363 | let x = lane_x |
| 364 | .saturating_add(wobble) |
| 365 | .min(area.width.saturating_sub(dome_w + 1)); |
| 366 | // A visit is a short, slow rise near the floor followed by a long |
| 367 | // absence: the jelly climbs [`JELLY_VISIT_ROWS`] rows and then spends |
| 368 | // the rest of the cycle out of sight. Rows are discrete cells, so the |
| 369 | // per-row dwell stays long — a jellyfish should read as drifting, not |
| 370 | // as stepping. |
| 371 | let rise_period = JELLY_RISE_ROW_MS.saturating_add((j as u128) * JELLY_RISE_ROW_STAGGER_MS); |
| 372 | let slot = (t.saturating_add(phase) / rise_period) % JELLY_VISIT_CYCLE_SLOTS; |
| 373 | if slot >= u128::from(JELLY_VISIT_ROWS) { |
| 374 | continue; // still down in the dark between visits |
| 375 | } |
| 376 | let risen = slot as u16; |
| 377 | let y = area.height.saturating_sub(3).saturating_sub(risen); |
| 378 | if y == 0 || in_band(y) { |
| 379 | continue; |
| 380 | } |
| 381 | let dome_brightness = jelly_glow(wave01(t, JELLY_PULSE_MS, phase)); |
| 382 | let tentacle_brightness = jelly_glow(wave01( |
| 383 | t.saturating_sub(JELLY_TENTACLE_LAG_MS), |
| 384 | JELLY_PULSE_MS, |
| 385 | phase, |
| 386 | )); |
| 387 | // The dome opens/closes on the same clock as its glow; the parked |
| 388 | // pose holds the half-pulsed (contracted) frame. |
| 389 | let pulse_frame = usize::from(wave01(t, JELLY_PULSE_MS, phase) > 0.5); |
| 390 | let skirt_row = y.saturating_add(1); |
| 391 | let tentacle_row = y.saturating_add(2); |
| 392 | // Treat the silhouette as one visual unit. The former per-row quiet |
| 393 | // band checks deliberately allowed the dome, skirt, or tentacles to |
| 394 | // disappear independently, which is exactly the broken punctuation |
| 395 | // visible in the v0.9.2 dogfood screenshot. |
| 396 | if tentacle_row >= area.height || [y, skirt_row, tentacle_row].into_iter().any(in_band) { |
| 397 | continue; |
| 398 | } |
| 399 | for (row, glyph) in [ |
| 400 | (y, dome_top[pulse_frame]), |
| 401 | (skirt_row, dome_skirt[pulse_frame]), |
| 402 | ] { |
| 403 | marks.push(AmbientMark { |
| 404 | x, |
| 405 | y: row, |
| 406 | glyph, |
| 407 | jellyfish: Some(j), |
| 408 | // Background ink, same as the tentacles: the dome used to sit |
| 409 | // a layer nearer than everything else in the side lanes, |
| 410 | // which is most of why it drew the eye. |
| 411 | depth: Depth::Background, |
| 412 | style_mod: None, |
| 413 | brightness: Some(dome_brightness), |
| 414 | }); |
| 415 | } |
| 416 | for (col, &dx) in tentacle_cols.iter().enumerate() { |
| 417 | // Each column runs the sway table with its own phase offset |
| 418 | // so the trio lags left-to-right; the parked pose holds a |
| 419 | // mid-sway frame. |
| 420 | let frame = t |
| 421 | .saturating_add(phase) |
| 422 | .saturating_add((col as u128) * JELLY_TENTACLE_PHASE_STEP_MS) |
| 423 | / JELLY_TENTACLE_SWAY_MS; |
| 424 | let sway = JELLY_TENTACLE_FRAMES[(frame as usize) % JELLY_TENTACLE_FRAMES.len()]; |
| 425 | marks.push(AmbientMark { |
| 426 | x: x.saturating_add(dx), |
| 427 | y: tentacle_row, |
| 428 | glyph: sway, |
| 429 | jellyfish: Some(j), |
| 430 | depth: Depth::Background, |
| 431 | style_mod: None, |
| 432 | brightness: Some(tentacle_brightness), |
| 433 | }); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | // --- Rising bubble streams (quiet ·/˚ with occasional glints) --- |
| 438 | for b in 0..density.bubble_streams() { |
| 439 | let phase = (b as u128).saturating_mul(1_900); |
| 440 | // Edge columns — avoid center brand. |
| 441 | let column = if b % 2 == 0 { |
| 442 | area.width / 8 |
| 443 | } else { |
| 444 | area.width.saturating_mul(7) / 8 |
| 445 | }; |
| 446 | let rise_period = 3_200u128.saturating_add(phase % 900); |
| 447 | let cycle = (t.saturating_add(phase) % rise_period) as f64 / rise_period as f64; |
| 448 | let max_rise = area.height.saturating_sub(3) as f64; |
| 449 | let rise = (cycle * max_rise) as u16; |
| 450 | let boost = if cursor.flee_elapsed_ms.is_some() && column.abs_diff(ptr) < 10 { |
| 451 | 2 |
| 452 | } else { |
| 453 | 0 |
| 454 | }; |
| 455 | let y = area |
| 456 | .height |
| 457 | .saturating_sub(2) |
| 458 | .saturating_sub(rise.saturating_add(boost)) |
| 459 | .max(quiet_top); |
| 460 | // Skip the empty-state text band. |
| 461 | if y > quiet_mid_lo && y < quiet_mid_hi { |
| 462 | continue; |
| 463 | } |
| 464 | let glyph = ["·", "˚", "·", "°"][((t.saturating_add(phase)) / 320) as usize % 4]; |
| 465 | let brightness = glint01(t, 2_600 + phase % 700, 600, BUBBLE_BRIGHTNESS_FLOOR, phase); |
| 466 | marks.push(AmbientMark { |
| 467 | x: column.min(area.width.saturating_sub(1)), |
| 468 | y, |
| 469 | glyph, |
| 470 | jellyfish: None, |
| 471 | depth: Depth::Foreground, |
| 472 | style_mod: None, |
| 473 | brightness: Some(brightness), |
| 474 | }); |
| 475 | } |
| 476 | |
| 477 | // --- Rare whale cameo (completion only) --- |
| 478 | if let Some(cameo_ms) = whale.elapsed_ms.filter(|ms| *ms < WHALE_CAMEO_MS) { |
| 479 | let phase = whale_cameo_phase(cameo_ms); |
| 480 | if phase != WhaleCameoPhase::Hidden { |
| 481 | let ax = whale |
| 482 | .anchor_x |
| 483 | .saturating_sub(area.x) |
| 484 | .min(area.width.saturating_sub(4)); |
| 485 | let ay = whale |
| 486 | .anchor_y |
| 487 | .saturating_sub(area.y) |
| 488 | .min(area.height.saturating_sub(2)); |
| 489 | let (glyph, y_off) = match phase { |
| 490 | WhaleCameoPhase::Breach => ("≈≈>", 0u16), |
| 491 | WhaleCameoPhase::Spout => ("≈≈>", 0), |
| 492 | WhaleCameoPhase::Fluke => ("～", 1), |
| 493 | WhaleCameoPhase::Submerge => ("·", 1), |
| 494 | WhaleCameoPhase::Hidden => ("", 0), |
| 495 | }; |
| 496 | if !glyph.is_empty() { |
| 497 | marks.push(AmbientMark { |
| 498 | x: ax, |
| 499 | y: ay.saturating_add(y_off).min(area.height.saturating_sub(1)), |
| 500 | glyph, |
| 501 | jellyfish: None, |
| 502 | depth: Depth::Foreground, |
| 503 | style_mod: None, |
| 504 | brightness: None, |
| 505 | }); |
| 506 | if phase == WhaleCameoPhase::Spout && ay > 0 { |
| 507 | marks.push(AmbientMark { |
| 508 | x: ax.saturating_add(1).min(area.width.saturating_sub(1)), |
| 509 | y: ay.saturating_sub(1), |
| 510 | glyph: "˚", |
| 511 | jellyfish: None, |
| 512 | depth: Depth::Foreground, |
| 513 | style_mod: Some(Modifier::DIM), |
| 514 | brightness: None, |
| 515 | }); |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | stats.marks_built = marks.len() as u32; |
| 522 | FrameMarks { marks } |
| 523 | } |
| 524 | |
| 525 | /// Loose diagonal wedge for the school: `(row_offset, columns_behind_lead)`. |
| 526 | /// The slight row spread is what makes it read as a school, not a text row. |
| 527 | const SCHOOL_WEDGE: &[(i16, u16)] = &[(0, 0), (-1, 4), (1, 6), (-2, 9), (2, 11), (0, 14), (-1, 17)]; |
| 528 | |
| 529 | /// Wall-clock milliseconds per column of school travel (~2.6 cells/s). |
| 530 | const SCHOOL_CELL_MS: u128 = 380; |
| 531 | /// Travelling brightness-wave period through the wedge. |
| 532 | const FISH_WAVE_MS: u128 = 2_200; |
| 533 | /// Fish are small: never let one sink into the gradient. |
| 534 | const FISH_BRIGHTNESS_FLOOR: f32 = 0.45; |
| 535 | |
| 536 | /// Lead fish silhouettes (ASCII only — width == len). Members drop the eye. |
| 537 | const LEAD_FISH_RIGHT: &str = "><o>"; |
| 538 | const LEAD_FISH_LEFT: &str = "<o><"; |
| 539 | |
| 540 | /// Jellyfish silhouette frames — pure ASCII by construction so the |
| 541 | /// ascii_safe tier needs no fallback mapping for them (len == width). |
| 542 | /// |
| 543 | /// Full dome (Rich/Normal), two rows with an open/closed pulse pair: a |
| 544 | /// rounded arc over the bell's rim. |
| 545 | /// |
| 546 | /// The skirt is the bell's lower rim and nothing else: it carries the pulse by |
| 547 | /// flaring (`\` `/`) and contracting (`(` `)`), the way a real bell swims. It |
| 548 | /// holds no interior glyphs on purpose — an earlier pair put marks inside the |
| 549 | /// rim (`(v_v)` / `(v.v)`), which read as two eyes and a mouth. The motion the |
| 550 | /// silhouette is meant to sell lives in the tentacle row below, not in the |
| 551 | /// skirt. |
| 552 | const JELLY_DOME_TOP_FRAMES: &[&str] = &[".-~-.", ".'-.'"]; |
| 553 | const JELLY_DOME_SKIRT_FRAMES: &[&str] = &["\\___/", "(___)"]; |
| 554 | /// Compact dome for the Sparse (narrow) tier: same two-row read at 3 cells. |
| 555 | const JELLY_DOME_TOP_COMPACT: &[&str] = &[".-.", "'.'"]; |
| 556 | const JELLY_DOME_SKIRT_COMPACT: &[&str] = &["\\_/", "(_)"]; |
| 557 | /// Tentacle sway frames (all width-1). Each column runs the same table with |
| 558 | /// a phase offset so the trio lags instead of strobing in sync. |
| 559 | const JELLY_TENTACLE_FRAMES: &[&str] = &["|", "/", "|", "\\"]; |
| 560 | |
| 561 | /// How far sideways a jellyfish may dodge to clear transcript text before it |
| 562 | /// is withheld for the frame instead. |
| 563 | /// |
| 564 | /// Placement is a pure function of the text under the silhouette, so during a |
| 565 | /// fast stream it is effectively a function of token throughput: a growing |
| 566 | /// line pushes the anchor one column per character, and a wrap or a scroll |
| 567 | /// collapses that row's occupied bounds and snaps the anchor back tens of |
| 568 | /// columns in a single frame. On screen that reads as teleporting, and it only |
| 569 | /// shows up on models fast enough to change those bounds every frame — which |
| 570 | /// is why slow providers never surfaced it. |
| 571 | /// |
| 572 | /// Bounding the dodge keeps the behavior the silhouette was actually given |
| 573 | /// (ease around a word that happens to brush its lane) and turns everything |
| 574 | /// larger into the same quiet withhold the fish already use. Worst-case |
| 575 | /// frame-to-frame movement is therefore `2 * JELLY_MAX_TEXT_DODGE_COLS`, at |
| 576 | /// the single moment a left-hand candidate overtakes a right-hand one. |
| 577 | const JELLY_MAX_TEXT_DODGE_COLS: u16 = 3; |
| 578 | |
| 579 | // --- Jellyfish rarity ------------------------------------------------------ |
| 580 | // The jellyfish is the loudest thing in the water: a five-cell silhouette that |
| 581 | // changes glyph as it pulses, parked in a side lane. Before v0.9.4 it was also |
| 582 | // permanently resident, which is the combination that made it obnoxious rather |
| 583 | // than incidental. Everything below is one knob with one stated intent, so the |
| 584 | // balance can be retuned without re-deriving it from the motion code. |
| 585 | |
| 586 | /// Wall-clock milliseconds a jellyfish spends on each row of its rise |
| 587 | /// (~9.4 s). A row step is a discrete one-cell jump, so the dwell has to stay |
| 588 | /// long or the rise reads as stepping rather than drifting. |
| 589 | const JELLY_RISE_ROW_MS: u128 = 9_400; |
| 590 | /// Per-jelly rise-rate stagger, so two jellyfish (should a tier ever want |
| 591 | /// them again) can never step in lockstep. |
| 592 | const JELLY_RISE_ROW_STAGGER_MS: u128 = 1_400; |
| 593 | /// Rows climbed in a single visit — about 56 s of presence. |
| 594 | const JELLY_VISIT_ROWS: u16 = 6; |
| 595 | /// Row-slots in one full visit cycle. Slots at or past [`JELLY_VISIT_ROWS`] |
| 596 | /// are spent out of sight, and that gap is *the* rarity knob: at 32 slots the |
| 597 | /// cycle is ~5 min and a jellyfish is present under a fifth of the time — |
| 598 | /// occasionally noticed, never resident. Raise it to make them rarer; lower |
| 599 | /// it to bring them back. It must stay `> JELLY_VISIT_ROWS` or the jelly |
| 600 | /// becomes permanent again. |
| 601 | const JELLY_VISIT_CYCLE_SLOTS: u128 = 32; |
| 602 | |
| 603 | // --- Jellyfish motion and glow --------------------------------------------- |
| 604 | |
| 605 | /// Dome pulse period. Slow on purpose: a pulse fast enough to notice in |
| 606 | /// peripheral vision is a pulse that interrupts reading. |
| 607 | const JELLY_PULSE_MS: u128 = 5_200; |
| 608 | /// The tentacles repeat the dome pulse this much later. Held at ~12% of |
| 609 | /// [`JELLY_PULSE_MS`] — the lag is what sells "jellyfish", so it scales with |
| 610 | /// the pulse rather than staying an absolute number. |
| 611 | const JELLY_TENTACLE_LAG_MS: u128 = 620; |
| 612 | /// Wall-clock milliseconds per tentacle sway frame. |
| 613 | const JELLY_TENTACLE_SWAY_MS: u128 = 2_600; |
| 614 | /// Per-column sway phase offset, so adjacent tentacles never move in sync. |
| 615 | /// Keep this a non-divisor of [`JELLY_TENTACLE_SWAY_MS`] or the trio strobes. |
| 616 | const JELLY_TENTACLE_PHASE_STEP_MS: u128 = 700; |
| 617 | /// Dimmest point of the pulse: still legible against the water, no lower. |
| 618 | const JELLY_BRIGHTNESS_FLOOR: f32 = 0.28; |
| 619 | /// Brightest point of the pulse. Deliberately well short of full ink — the |
| 620 | /// jellyfish used to swing floor-to-1.0, and that swing (not its presence) |
| 621 | /// is what pulled the eye off the transcript. |
| 622 | const JELLY_BRIGHTNESS_CEIL: f32 = 0.62; |
| 623 | |
| 624 | /// Map a `[0, 1]` pulse onto the jellyfish's shallow glow band. |
| 625 | #[must_use] |
| 626 | fn jelly_glow(pulse: f32) -> f32 { |
| 627 | JELLY_BRIGHTNESS_FLOOR + (JELLY_BRIGHTNESS_CEIL - JELLY_BRIGHTNESS_FLOOR) * pulse |
| 628 | } |
| 629 | |
| 630 | /// Bubbles stay mostly steady with occasional glints, not a constant wave. |
| 631 | const BUBBLE_BRIGHTNESS_FLOOR: f32 = 0.55; |
| 632 | |
| 633 | /// One soft sin² hump per `period_ms`, wall-clock keyed, in `[0, 1]`. |
| 634 | #[must_use] |
| 635 | fn wave01(elapsed_ms: u128, period_ms: u128, phase_ms: u128) -> f32 { |
| 636 | if period_ms == 0 { |
| 637 | return 1.0; |
| 638 | } |
| 639 | let frac = (elapsed_ms.saturating_add(phase_ms) % period_ms) as f64 / period_ms as f64; |
| 640 | let s = (frac * std::f64::consts::PI).sin(); |
| 641 | (s * s) as f32 |
| 642 | } |
| 643 | |
| 644 | /// Mostly `floor`, with a raised-cosine glint to full brightness for |
| 645 | /// `glint_ms` out of every `period_ms`. |
| 646 | #[must_use] |
| 647 | fn glint01(elapsed_ms: u128, period_ms: u128, glint_ms: u128, floor: f32, phase_ms: u128) -> f32 { |
| 648 | if period_ms == 0 || glint_ms == 0 { |
| 649 | return floor; |
| 650 | } |
| 651 | let pos = elapsed_ms.saturating_add(phase_ms) % period_ms; |
| 652 | if pos >= glint_ms { |
| 653 | return floor; |
| 654 | } |
| 655 | let frac = pos as f64 / glint_ms as f64; |
| 656 | let bump = 0.5 * (1.0 - (frac * std::f64::consts::TAU).cos()); |
| 657 | floor + (1.0 - floor) * bump as f32 |
| 658 | } |
| 659 | |
| 660 | /// Stateless per-crossing travel direction. Direction only ever changes |
| 661 | /// between cycles — while the school is fully off-screen — so a turn is |
| 662 | /// never visible as an in-place flip. |
| 663 | #[must_use] |
| 664 | fn school_swims_right(cycle_index: u128) -> bool { |
| 665 | (cycle_index.wrapping_mul(0x9E37_79B9_7F4A_7C15) >> 7) & 1 == 0 |
| 666 | } |
| 667 | |
| 668 | /// Stateless per-crossing band choice (lower vs upper third). |
| 669 | #[must_use] |
| 670 | fn school_swims_low(cycle_index: u128) -> bool { |
| 671 | (cycle_index.wrapping_mul(0xC2B2_AE3D_27D4_EB4F) >> 9) & 1 == 0 |
| 672 | } |
| 673 | |
| 674 | fn paint_marks( |
| 675 | area: Rect, |
| 676 | buf: &mut Buffer, |
| 677 | inks: (Color, Color), |
| 678 | lines: &[Line<'static>], |
| 679 | frame: &FrameMarks, |
| 680 | presence: f32, |
| 681 | stats: &mut AmbientFrameStats, |
| 682 | ) { |
| 683 | if presence <= 0.0 { |
| 684 | // Fully static water: nothing to paint (all marks invisible). |
| 685 | return; |
| 686 | } |
| 687 | let presence = presence.clamp(0.0, 1.0); |
| 688 | #[derive(Clone, Copy)] |
| 689 | enum SkipReason { |
| 690 | Text, |
| 691 | Clipped, |
| 692 | } |
| 693 | |
| 694 | #[derive(Clone, Copy)] |
| 695 | enum Placement { |
| 696 | Anchor { original: u16, placed: u16 }, |
| 697 | Skip(SkipReason), |
| 698 | } |
| 699 | #[derive(Clone, Copy)] |
| 700 | struct RowBounds { |
| 701 | y: u16, |
| 702 | protected: Option<(usize, usize)>, |
| 703 | } |
| 704 | |
| 705 | let mut placements: [Option<Placement>; 2] = [None, None]; |
| 706 | let population_overflow = frame |
| 707 | .marks |
| 708 | .iter() |
| 709 | .filter_map(|mark| mark.jellyfish) |
| 710 | .any(|jellyfish| jellyfish >= placements.len()); |
| 711 | debug_assert!( |
| 712 | !population_overflow, |
| 713 | "jellyfish population exceeded its bound" |
| 714 | ); |
| 715 | for (jellyfish, placement) in placements.iter_mut().enumerate() { |
| 716 | let marks = || { |
| 717 | frame |
| 718 | .marks |
| 719 | .iter() |
| 720 | .filter(move |mark| mark.jellyfish == Some(jellyfish)) |
| 721 | }; |
| 722 | let Some(original) = marks().map(|mark| mark.x).min() else { |
| 723 | continue; |
| 724 | }; |
| 725 | let mut rows: [Option<RowBounds>; MAX_FRAME_MARKS as usize] = |
| 726 | [None; MAX_FRAME_MARKS as usize]; |
| 727 | let mut row_count = 0usize; |
| 728 | let mut row_overflow = false; |
| 729 | let mut group_end = 0u16; |
| 730 | for mark in marks() { |
| 731 | let offset = mark.x.saturating_sub(original); |
| 732 | let width = u16::try_from(UnicodeWidthStr::width(mark.glyph)).unwrap_or(u16::MAX); |
| 733 | group_end = group_end.max(offset.saturating_add(width)); |
| 734 | if rows[..row_count] |
| 735 | .iter() |
| 736 | .flatten() |
| 737 | .all(|row| row.y != mark.y) |
| 738 | { |
| 739 | if row_count == rows.len() { |
| 740 | debug_assert!( |
| 741 | row_count < rows.len(), |
| 742 | "jellyfish rows exceeded the ambient mark budget" |
| 743 | ); |
| 744 | row_overflow = true; |
| 745 | break; |
| 746 | } |
| 747 | rows[row_count] = Some(RowBounds { |
| 748 | y: mark.y, |
| 749 | protected: lines |
| 750 | .get(usize::from(mark.y)) |
| 751 | .and_then(occupied_text_bounds), |
| 752 | }); |
| 753 | row_count += 1; |
| 754 | } |
| 755 | } |
| 756 | if row_overflow { |
| 757 | *placement = Some(Placement::Skip(SkipReason::Clipped)); |
| 758 | continue; |
| 759 | } |
| 760 | let Some(right_edge) = area.width.checked_sub(group_end) else { |
| 761 | *placement = Some(Placement::Skip(SkipReason::Clipped)); |
| 762 | continue; |
| 763 | }; |
| 764 | |
| 765 | let mut best: Option<(u16, u16)> = None; |
| 766 | let mut consider = |candidate: i64| { |
| 767 | let Ok(candidate) = u16::try_from(candidate) else { |
| 768 | return; |
| 769 | }; |
| 770 | // Bounded dodge. Anything further than the cap is a relocation |
| 771 | // rather than a drift, so it is refused here and the silhouette |
| 772 | // is withheld instead — see [`JELLY_MAX_TEXT_DODGE_COLS`]. |
| 773 | let dodge = candidate.abs_diff(original); |
| 774 | if dodge > JELLY_MAX_TEXT_DODGE_COLS { |
| 775 | return; |
| 776 | } |
| 777 | let fits = candidate <= right_edge |
| 778 | && marks().all(|mark| { |
| 779 | let x = candidate.saturating_add(mark.x.saturating_sub(original)); |
| 780 | let width = UnicodeWidthStr::width(mark.glyph); |
| 781 | !rows[..row_count] |
| 782 | .iter() |
| 783 | .flatten() |
| 784 | .find(|row| row.y == mark.y) |
| 785 | .and_then(|row| row.protected) |
| 786 | .is_some_and(|(start, end)| { |
| 787 | usize::from(x) < end.saturating_add(1) |
| 788 | && usize::from(x) + width > start.saturating_sub(1) |
| 789 | }) |
| 790 | }); |
| 791 | if fits { |
| 792 | let ranked = (dodge, candidate); |
| 793 | if best.is_none_or(|current| ranked < current) { |
| 794 | best = Some(ranked); |
| 795 | } |
| 796 | } |
| 797 | }; |
| 798 | consider(i64::from(original)); |
| 799 | consider(0); |
| 800 | consider(i64::from(right_edge)); |
| 801 | for mark in marks() { |
| 802 | let Some((start, end)) = rows[..row_count] |
| 803 | .iter() |
| 804 | .flatten() |
| 805 | .find(|row| row.y == mark.y) |
| 806 | .and_then(|row| row.protected) |
| 807 | else { |
| 808 | continue; |
| 809 | }; |
| 810 | let offset = mark.x.saturating_sub(original); |
| 811 | let mark_end = offset.saturating_add( |
| 812 | u16::try_from(UnicodeWidthStr::width(mark.glyph)).unwrap_or(u16::MAX), |
| 813 | ); |
| 814 | if let Ok(start) = i64::try_from(start) { |
| 815 | consider(start - 1 - i64::from(mark_end)); |
| 816 | } |
| 817 | if let Ok(end) = i64::try_from(end) { |
| 818 | consider(end + 1 - i64::from(offset)); |
| 819 | } |
| 820 | } |
| 821 | *placement = Some(match best { |
| 822 | Some((_, placed)) => Placement::Anchor { original, placed }, |
| 823 | None => Placement::Skip(SkipReason::Text), |
| 824 | }); |
| 825 | } |
| 826 | |
| 827 | for mark in &frame.marks { |
| 828 | let mark_placement = mark |
| 829 | .jellyfish |
| 830 | .map(|index| placements.get(index).copied().flatten()); |
| 831 | let (mark_x, preflighted) = match mark_placement { |
| 832 | Some(None) => { |
| 833 | stats.marks_clipped += 1; |
| 834 | continue; |
| 835 | } |
| 836 | Some(Some(Placement::Anchor { original, placed })) => ( |
| 837 | placed |
| 838 | .checked_add(mark.x.saturating_sub(original)) |
| 839 | .expect("preflight accepted a clipped jellyfish"), |
| 840 | true, |
| 841 | ), |
| 842 | Some(Some(Placement::Skip(SkipReason::Text))) => { |
| 843 | stats.marks_skipped_text += 1; |
| 844 | continue; |
| 845 | } |
| 846 | Some(Some(Placement::Skip(SkipReason::Clipped))) => { |
| 847 | stats.marks_clipped += 1; |
| 848 | continue; |
| 849 | } |
| 850 | None => (mark.x, false), |
| 851 | }; |
| 852 | if !preflighted { |
| 853 | let mark_width = UnicodeWidthStr::width(mark.glyph); |
| 854 | // Clipped is checked before text collision so a mark that fails |
| 855 | // both is charged to the bound it could never satisfy. |
| 856 | if mark_x.saturating_add(mark_width as u16) > area.width { |
| 857 | stats.marks_clipped += 1; |
| 858 | continue; |
| 859 | } |
| 860 | let protected = lines |
| 861 | .get(usize::from(mark.y)) |
| 862 | .and_then(occupied_text_bounds); |
| 863 | let collides = protected.is_some_and(|(start, end)| { |
| 864 | usize::from(mark_x) < end.saturating_add(1) |
| 865 | && usize::from(mark_x) + mark_width > start.saturating_sub(1) |
| 866 | }); |
| 867 | if collides { |
| 868 | stats.marks_skipped_text += 1; |
| 869 | continue; |
| 870 | } |
| 871 | } |
| 872 | stats.marks_painted += 1; |
| 873 | let ink = if mark.depth.ink_index() == 1 { |
| 874 | inks.1 |
| 875 | } else { |
| 876 | inks.0 |
| 877 | }; |
| 878 | for (offset, ch) in mark.glyph.chars().enumerate() { |
| 879 | let cell = &mut buf[(area.x + mark_x + offset as u16, area.y + mark.y)]; |
| 880 | // Glow language: lerp the mark's ink up from the water the cell |
| 881 | // already sits in, at the entity's time-varying brightness. The |
| 882 | // overall lerp is additionally scaled by life presence so marks |
| 883 | // fade in/out with the animated/static boundary. |
| 884 | let fg = match (mark.brightness, cell.style().bg) { |
| 885 | (Some(amount), Some(water)) => { |
| 886 | ocean::mix_colors(water, ink, (amount * presence).clamp(0.0, 1.0)) |
| 887 | } |
| 888 | (Some(amount), None) => ocean::scale_color(ink, amount.clamp(0.0, 1.0).max(0.4)), |
| 889 | (None, Some(water)) => ocean::mix_colors(water, ink, presence), |
| 890 | (None, None) => ocean::scale_color(ink, presence), |
| 891 | }; |
| 892 | let mut style = Style::default().fg(fg); |
| 893 | if let Some(m) = mark.style_mod { |
| 894 | style = style.add_modifier(m); |
| 895 | } |
| 896 | cell.set_symbol(&ch.to_string()); |
| 897 | cell.set_style(style); |
| 898 | stats.cells_written += 1; |
| 899 | } |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | /// Width-only occupied-text measurement (no per-line String allocation). |
| 904 | #[must_use] |
| 905 | pub fn occupied_text_bounds(line: &Line<'_>) -> Option<(usize, usize)> { |
| 906 | if line.spans.is_empty() { |
| 907 | return None; |
| 908 | } |
| 909 | let mut total = 0usize; |
| 910 | let mut leading = 0usize; |
| 911 | let mut seen_non_ws = false; |
| 912 | let mut trailing_run = 0usize; |
| 913 | |
| 914 | for span in &line.spans { |
| 915 | for ch in span.content.chars() { |
| 916 | let w = UnicodeWidthChar::width(ch).unwrap_or(0); |
| 917 | total = total.saturating_add(w); |
| 918 | if ch.is_whitespace() { |
| 919 | if !seen_non_ws { |
| 920 | leading = leading.saturating_add(w); |
| 921 | } else { |
| 922 | trailing_run = trailing_run.saturating_add(w); |
| 923 | } |
| 924 | } else { |
| 925 | seen_non_ws = true; |
| 926 | trailing_run = 0; |
| 927 | } |
| 928 | } |
| 929 | } |
| 930 | if !seen_non_ws { |
| 931 | return None; |
| 932 | } |
| 933 | Some((leading, total.saturating_sub(trailing_run))) |
| 934 | } |
| 935 | |
| 936 | #[must_use] |
| 937 | fn sine_bob(elapsed_ms: u128, period_ms: u128, amplitude: u16) -> u16 { |
| 938 | if period_ms == 0 || amplitude == 0 { |
| 939 | return 0; |
| 940 | } |
| 941 | let phase = (elapsed_ms % period_ms) as f64 / period_ms as f64; |
| 942 | let s = (phase * std::f64::consts::TAU).sin(); |
| 943 | // Map [-1,1] → [0, amplitude] |
| 944 | (((s + 1.0) * 0.5) * f64::from(amplitude)).round() as u16 |
| 945 | } |
| 946 | |
| 947 | /// One-shot flee arc keyed to Working transition / pointer motion. |
| 948 | #[must_use] |
| 949 | pub fn fish_flee_offset(elapsed_ms: u128) -> u16 { |
| 950 | let progress = elapsed_ms.min(800) as f32 / 800.0; |
| 951 | let excursion = (progress * std::f32::consts::PI).sin() * 9.0; |
| 952 | excursion.round().clamp(0.0, 9.0) as u16 |
| 953 | } |
| 954 | |
| 955 | /// One fish silhouette family for the whole school: the lead carries an eye |
| 956 | /// (`><o>`), members are plain `><>`. Never mix lone `>` arrows in — that |
| 957 | /// reads as broken punctuation. All bodies are ASCII so `len() == width`. |
| 958 | #[must_use] |
| 959 | fn fish_body(facing_right: bool, lead: bool) -> &'static str { |
| 960 | match (facing_right, lead) { |
| 961 | (true, true) => LEAD_FISH_RIGHT, |
| 962 | (true, false) => "><>", |
| 963 | (false, true) => LEAD_FISH_LEFT, |
| 964 | (false, false) => "<><", |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | #[must_use] |
| 969 | pub fn whale_cameo_phase(elapsed_ms: u128) -> WhaleCameoPhase { |
| 970 | match elapsed_ms { |
| 971 | 0..400 => WhaleCameoPhase::Breach, |
| 972 | 400..1_000 => WhaleCameoPhase::Spout, |
| 973 | 1_000..1_700 => WhaleCameoPhase::Fluke, |
| 974 | 1_700..WHALE_CAMEO_MS => WhaleCameoPhase::Submerge, |
| 975 | _ => WhaleCameoPhase::Hidden, |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | /// Subtle caustic shimmer applied to empty water cells when the field would |
| 980 | /// otherwise read as a static ramp. Cheap: one phase lookup per cell, only |
| 981 | /// when `animated` and density allows. |
| 982 | pub fn apply_caustic_shimmer( |
| 983 | area: Rect, |
| 984 | buf: &mut Buffer, |
| 985 | column: &OceanColumn, |
| 986 | elapsed_ms: u128, |
| 987 | animated: bool, |
| 988 | lines: &[Line<'static>], |
| 989 | ) { |
| 990 | if !animated || area.width < AMBIENT_MIN_WIDTH || area.height < AMBIENT_MIN_HEIGHT { |
| 991 | return; |
| 992 | } |
| 993 | // Sparse sampling: every 3rd column on every other row near the surface. |
| 994 | let band = (area.height / 3).max(2); |
| 995 | for local_y in 0..band { |
| 996 | let protected = lines |
| 997 | .get(usize::from(local_y)) |
| 998 | .and_then(occupied_text_bounds); |
| 999 | let ramp = frame_ocean_ramp( |
| 1000 | column, |
| 1001 | area.height, |
| 1002 | area.y, |
| 1003 | elapsed_ms, |
| 1004 | column.phase_tag(), |
| 1005 | column.ramp_fingerprint(), |
| 1006 | ); |
| 1007 | let row_bg = ramp |
| 1008 | .get(usize::from(local_y)) |
| 1009 | .copied() |
| 1010 | .unwrap_or_else(|| column.color_at_y(area.y.saturating_add(local_y))); |
| 1011 | for local_x in (0..area.width).step_by(3) { |
| 1012 | if protected.is_some_and(|(start, end)| { |
| 1013 | usize::from(local_x) >= start && usize::from(local_x) < end |
| 1014 | }) { |
| 1015 | continue; |
| 1016 | } |
| 1017 | let phase = ((elapsed_ms / 80) |
| 1018 | .wrapping_add(u128::from(local_x)) |
| 1019 | .wrapping_add(u128::from(local_y) * 3)) |
| 1020 | % 12; |
| 1021 | if phase > 2 { |
| 1022 | continue; |
| 1023 | } |
| 1024 | let cell = &mut buf[(area.x + local_x, area.y + local_y)]; |
| 1025 | // Soften toward ambient ink without replacing semantic glyphs. |
| 1026 | if cell.symbol() == " " || cell.symbol().is_empty() { |
| 1027 | let shimmer = ocean::scale_color(row_bg, 1.08); |
| 1028 | cell.set_bg(shimmer); |
| 1029 | } |
| 1030 | } |
| 1031 | } |
| 1032 | } |
| 1033 | |
| 1034 | /// Cached ocean row colors invalidated only when phase/dimensions/palette/breath tick. |
| 1035 | /// Shared across widgets that paint the same [`OceanColumn`] within a frame. |
| 1036 | #[derive(Debug, Clone, Default)] |
| 1037 | pub struct OceanRampCache { |
| 1038 | colors: Vec<Color>, |
| 1039 | height: u16, |
| 1040 | top: u16, |
| 1041 | elapsed_bucket: u128, |
| 1042 | phase_tag: u8, |
| 1043 | ramp_fingerprint: u64, |
| 1044 | } |
| 1045 | |
| 1046 | impl OceanRampCache { |
| 1047 | /// Return a per-row color ramp, recomputing only when inputs change. |
| 1048 | pub fn colors_for( |
| 1049 | &mut self, |
| 1050 | column: &OceanColumn, |
| 1051 | height: u16, |
| 1052 | top: u16, |
| 1053 | elapsed_ms: u128, |
| 1054 | phase_tag: u8, |
| 1055 | ramp_fingerprint: u64, |
| 1056 | ) -> &[Color] { |
| 1057 | // Breath cycle is 90s; bucket at ~80ms atmosphere cadence so we don't |
| 1058 | // recompute every draw when nothing visible changed. |
| 1059 | let bucket = elapsed_ms / 80; |
| 1060 | if self.colors.len() == usize::from(height) |
| 1061 | && self.height == height |
| 1062 | && self.top == top |
| 1063 | && self.elapsed_bucket == bucket |
| 1064 | && self.phase_tag == phase_tag |
| 1065 | && self.ramp_fingerprint == ramp_fingerprint |
| 1066 | { |
| 1067 | return &self.colors; |
| 1068 | } |
| 1069 | self.colors.clear(); |
| 1070 | self.colors.reserve(usize::from(height)); |
| 1071 | for local_y in 0..height { |
| 1072 | self.colors |
| 1073 | .push(column.color_at_y(top.saturating_add(local_y))); |
| 1074 | } |
| 1075 | self.height = height; |
| 1076 | self.top = top; |
| 1077 | self.elapsed_bucket = bucket; |
| 1078 | self.phase_tag = phase_tag; |
| 1079 | self.ramp_fingerprint = ramp_fingerprint; |
| 1080 | &self.colors |
| 1081 | } |
| 1082 | } |
| 1083 | |
| 1084 | thread_local! { |
| 1085 | static FRAME_RAMP: std::cell::RefCell<OceanRampCache> = |
| 1086 | const { std::cell::RefCell::new(OceanRampCache { |
| 1087 | colors: Vec::new(), |
| 1088 | height: 0, |
| 1089 | top: 0, |
| 1090 | elapsed_bucket: 0, |
| 1091 | phase_tag: 0, |
| 1092 | ramp_fingerprint: 0, |
| 1093 | }) }; |
| 1094 | } |
| 1095 | |
| 1096 | /// Process-local per-frame ocean ramp shared by chat field, caustics, and |
| 1097 | /// other widgets that paint the same column. |
| 1098 | #[must_use] |
| 1099 | pub fn frame_ocean_ramp( |
| 1100 | column: &OceanColumn, |
| 1101 | height: u16, |
| 1102 | top: u16, |
| 1103 | elapsed_ms: u128, |
| 1104 | phase_tag: u8, |
| 1105 | ramp_fingerprint: u64, |
| 1106 | ) -> Vec<Color> { |
| 1107 | FRAME_RAMP.with(|cache| { |
| 1108 | cache |
| 1109 | .borrow_mut() |
| 1110 | .colors_for(column, height, top, elapsed_ms, phase_tag, ramp_fingerprint) |
| 1111 | .to_vec() |
| 1112 | }) |
| 1113 | } |
| 1114 | |
| 1115 | #[cfg(test)] |
| 1116 | #[path = "ambient_life/tests.rs"] |
| 1117 | mod tests; |
| 1118 |