daniel-c-harvey
1700 lines
90 KiB
TypeScript
1700 lines
90 KiB
TypeScript
/**
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* MixVisualizer — the scrolling Mix waveform background (Phase 10 + Lava Reframe).
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*
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* What this renders: a *windowed* slice of a mix's loudness profile, scrolling
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* bottom-to-top, coupled to playback position. New audio enters at the bottom,
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* already-played audio exits off the top, and the "now" playhead sits at a fixed
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* line (vertical centre by default). This is a read-only, ambient lava-lamp
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* background — there is no seek, no click handling, no write-back to playback.
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*
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* Rendering tech: WebGL2, fragment-shader, plus (as of the Lava Reframe Wave R2) a
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* CPU-side per-frame PHYSICS step that drives the wax lava. The scroll/zoom geometry
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* and the loudness-datum-as-texture sampling carry forward from Phase 10 Waves 1–2;
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* the playhead wall-clock interpolation + jitter correction carry forward as-is.
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*
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* THE LAVA (Wave R2 — this revision):
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* The rejected analytic-metaball "lava" (scripted blobs that read as giant
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* disconnected circles) is replaced by a real Lagrangian wax-blob simulation:
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* • 16–32 blobs carry position / velocity / temperature / radius and are
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* integrated each frame with real dt (gravity, temperature-buoyancy, viscous
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* damping, soft floor contact) — see stepPhysics().
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* • 2D ELASTIC COLLISION: blob↔waveform (the ribbon is a read-only boundary the
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* wax is pushed out of along its surface normal) and blob↔blob, both with a
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* soft↔hard strength dial — see stepPhysics()'s collision passes.
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* • The blobs upload as a uBlobs[] uniform array; the fragment shader unions them
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* with smin metaballs + the waveform SDF into one liquid surface (liquidSdf).
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* Colour is a deliberately SIMPLE theme fill for R2 — the OKLab three-colour
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* gradient is Wave R3. No glass, no screen-space noise (removed in R1).
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*
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* The Blazor component owns the canvas element and the inputs (datum, playback,
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* zoom, theme, the control dials); this module owns the requestAnimationFrame loop,
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* the physics step, and all the GL math. The component drives it through the handle
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* returned by `create`. The handle SHAPE is unchanged from Phase 10 — the three
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* effect setters are temporarily re-routed to the lava params for this wave (see
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* their definitions); Wave R4 gives them proper names + a six-knob UI.
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*/
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// ── Tuning anchors (see spec §B). These are the load-bearing constants. ──────────
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/**
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* Hard anchor: at maximum zoom the window shows exactly one quarter note at
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* 180 BPM = 60 / 180 s = 0.333 s of audio, top to bottom. This is a fixed
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* requirement, not a tunable.
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*/
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export const MIN_VISIBLE_SECONDS = 60 / 180; // 0.3333… s — quarter note @ 180 BPM
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/** Slow end of the zoom range — how much of the mix is visible at minimum zoom. Tunable. */
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export const MAX_VISIBLE_SECONDS = 30;
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/** Default opening window when a mix is first opened. Tunable. */
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export const DEFAULT_VISIBLE_SECONDS = 10;
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// ── Control tuning anchors. These mirror the C#-side defaults in ──────────────────
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// MixVisualizerControlState.cs — keep the two in sync, exactly as the
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// DEFAULT_VISIBLE_SECONDS / DefaultVisibleSeconds pair is kept in sync. All three are
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// normalized [0,1].
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//
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// R2 TEMPORARY RE-WIRING (Wave R4 replaces this with the proper six-knob set):
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// the three existing control knobs are re-purposed to drive the new lava physics so
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// Daniel can feel the system in-browser this wave. The knob NAMES on screen still say
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// the old thing; the SETTERS below (setBubblyness/setDetach/setColorShiftSpeed) route
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// them to the new physics params. Mapping:
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// • "Detach" knob (Air icon) → lava HEAT
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// • "Bubblyness" knob (BubbleChart) → lava GRAVITY
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// • "Color-shift" knob (Palette) → COLLISION STRENGTH
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// Blob DENSITY has no live knob this wave; it sits at DEFAULT_BLOB_DENSITY (R4 adds it).
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// The defaults below are chosen so the lava looks ALIVE on open (heat non-zero, mid
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// gravity, mid collision) — Daniel then tunes on screen.
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/** Default GRAVITY dial (was bulge). Mirrors C# DefaultBubblyness. Mid = a settled-but-mobile lamp. */
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export const DEFAULT_BUBBLYNESS = 0.5;
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/** Default HEAT dial (was detach). Mirrors C# DefaultDetach. Non-zero so the lamp is alive on open. */
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export const DEFAULT_DETACH = 0.45;
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/** Default COLLISION-STRENGTH dial (was color-shift). Mirrors C# DefaultColorShiftSpeed. Mid soft↔hard. */
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export const DEFAULT_COLOR_SHIFT_SPEED = 0.5;
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/** Default blob density (no live knob this wave; R4 exposes it). 0 = few large lazy blobs, 1 = many small. */
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export const DEFAULT_BLOB_DENSITY = 0.4;
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/**
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* Where the "now" line sits within the window, as a fraction from the top.
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* 0.5 = vertical centre (default): a short lead-in below, a short trail-out above.
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* Tunable. NOTE: kept in sync with the GLSL constant NOW_ANCHOR_FROM_TOP below.
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*/
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const NOW_ANCHOR_FROM_TOP = 0.5;
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/**
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* Half-width of the ribbon at full loudness, as a fraction of half the canvas
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* width (the predecessor used 0.92). Mirrors the Canvas `maxHalfWidth` factor.
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*/
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const RIBBON_HALF_WIDTH_FRAC = 0.92;
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/**
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* Cap device-pixel-ratio at 2. Beyond that the extra fragments cost frame time for
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* no visible gain on a soft glassy backdrop — this is the graceful-degrade lever
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* (spec §5.1): drop internal resolution before dropping frames.
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*/
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const MAX_DPR = 2;
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// ════════════════════════════════════════════════════════════════════════════════════
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// R2 — the wax-blob lava physics (CPU step + uniform upload). The lava is now a real
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// Lagrangian particle system integrated each frame on the JS side and rendered as
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// smin metaballs in the fragment shader. EVERYTHING below is the tuning surface for
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// the lava look; Daniel reads + tunes these.
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//
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// Coordinate convention (shared with the shader): physics runs in HEIGHT-NORMALIZED
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// space — every position/velocity/radius is in units of (pixel / canvasHeight). So
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// y ∈ [0, 1] top→bottom, x ∈ [0, W/H], and the FLOOR (footer / lava rest line) is the
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// bottom edge of the canvas at y = 1 (the canvas is already CSS-clipped to the footer
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// top in R1, so its own bottom edge IS the footer line — no extra clip uniform needed).
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// Using one isotropic unit keeps blobs round and collisions correct at any aspect.
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// ════════════════════════════════════════════════════════════════════════════════════
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/**
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* Hard upper bound on the simulated/rendered blob population. The per-fragment shader
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* loops to this constant, so it caps GPU cost; the CPU step is O(MAX_BLOBS²) for
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* blob↔blob (≤ ~1k pair tests — trivial). 32 is the spec's upper band (§4g). The live
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* count varies with the density dial but never exceeds this.
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*/
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const MAX_BLOBS = 32;
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/** Lower end of the live blob count (density dial 0 → a few large lazy blobs, §4e). */
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const MIN_BLOB_COUNT = 16;
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/** Blob radius band in height-normalized units. 0.025·H ≈ 20px and 0.13·H ≈ 100px on a
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* ~760px-tall canvas — the spec's ~20–100px range (§4b). Each blob picks a fixed radius
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* in this band at construction; the density dial biases the average. */
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const BLOB_RADIUS_MIN = 0.025;
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const BLOB_RADIUS_MAX = 0.13;
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/**
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* Gravity acceleration at the gravity dial = 1, in height-units / s². Downward (+y).
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* Tuned so wax at full gravity falls back to the floor in well under a second from
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* mid-screen (0.5 height) — a firm settle — while still letting buoyancy win when hot.
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* The dial scales this 0→1 linearly (dial 0 = near-weightless float, §4d).
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*/
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const GRAVITY_ACCEL_MAX = 2.2;
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/** Floor of gravity even at dial 0, so wax never becomes truly weightless (always settles). */
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const GRAVITY_ACCEL_MIN = 0.15;
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/**
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* Buoyancy lift coefficient: upward accel = BUOYANCY_COEFF · heatScale · (T − T_ambient).
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* Hot wax (T high) rises; cool wax (T low) sinks. This is the OTHER half of the lamp's
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* core tension against gravity. Tuned against GRAVITY_ACCEL_MAX so that at full heat a
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* hot blob (T≈1) overcomes mid-gravity and climbs, and at heat 0 (heatScale 0) buoyancy
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* vanishes entirely → wax just obeys gravity and rests on the floor (spec §4c endpoint).
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*/
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const BUOYANCY_COEFF = 4.0;
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const TEMP_AMBIENT = 0.5; // the neutral temperature; above it lifts, below it sinks
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/**
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* Heat transfer rates (per second), the engine of the convection cycle:
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* - near the FLOOR a blob HEATS toward 1 (the "lamp bulb" at the bottom),
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* - near the TOP it COOLS toward 0 (loses heat at the cold cap),
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* - everywhere it relaxes gently toward ambient.
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* heatScale (the heat dial's transfer-function output, see heatScaleFromDial) gates the
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* floor-heating rate: at dial 0 the floor adds NO heat, so nothing ever becomes buoyant
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* and the pool rests; at dial 1 the floor pumps heat fast → many blobs go buoyant and
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* rise per second (the busy roiling lamp, §4c max endpoint).
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*/
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const HEAT_FLOOR_RATE = 1.6; // °/s toward T=1 when sitting on the floor (× heatScale)
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const HEAT_TOP_RATE = 1.2; // °/s toward T=0 when near the top
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const HEAT_AMBIENT_RATE = 0.25; // °/s relaxation toward ambient everywhere
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const HEAT_FLOOR_ZONE = 0.16; // height-fraction above the floor counted as "hot zone"
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const HEAT_TOP_ZONE = 0.16; // height-fraction below the top counted as "cold zone"
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/**
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* Viscous (linear) velocity damping per second — the lazy/high-viscosity regime that
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* makes it read as wax, not water (spec §4a). Applied as v *= exp(−DAMPING·dt) each
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* step, so it is frame-rate independent. High enough that motion is slow and gooey;
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* low enough that hot blobs still make the trip up.
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*/
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const VISCOUS_DAMPING = 1.4;
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/**
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* Soft floor contact: instead of a hard clamp that jitters, a resting blob is pushed up
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* by a spring proportional to its penetration below the floor, and its downward velocity
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* is killed on contact so pooled wax flattens and settles rather than bouncing forever.
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*/
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const FLOOR_SPRING = 26.0; // restoring accel per unit penetration (height-units/s²)
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const FLOOR_CONTACT_DAMPING = 6.0; // extra damping applied while in floor contact (settle)
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/**
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* Blob↔blob collision: the soft↔hard knob (collision strength) blends a penalty SPRING
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* (soft displacement, blobs squish and partially overlap then ease apart) toward an
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* elastic IMPULSE (hard, crisp restitution along the centre line). These are the two
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* endpoints the strength dial interpolates (§5c). Restitution is the bounciness of the
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* hard end; the spring stiffness is the firmness of the soft end.
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*/
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const BLOB_COLLIDE_SPRING = 14.0; // soft penalty stiffness (height-units/s² per overlap)
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const BLOB_RESTITUTION_HARD = 0.9; // elastic restitution at strength = 1 (near-perfect bounce)
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const BLOB_RESTITUTION_SOFT = 0.15; // residual restitution at strength = 0 (mostly absorptive)
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/**
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* Blob↔waveform collision (always on, independent of heat — §5b). The waveform's
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* half-width at a blob's row is sampled CPU-side each frame; a blob whose centre is
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* within (halfWidth + radius) of the centre line is penetrating the ribbon and is pushed
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* out along the surface normal. Same soft↔hard blend as blob↔blob: a penalty spring at
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* the soft end → elastic reflection of the inward velocity at the hard end. The waveform
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* is read-only authority: it pushes the fluid, the fluid never moves it.
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*/
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const WAVE_COLLIDE_SPRING = 20.0; // soft penalty stiffness pushing wax off the ribbon
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const WAVE_RESTITUTION_HARD = 0.85; // elastic reflection strength at full collision hardness
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const WAVE_RESTITUTION_SOFT = 0.1;
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/**
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* Max physics timestep, seconds. rAF can stall (tab blur, GC); a huge dt would let a
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* blob tunnel through the floor or another blob in one step (explosive overlap). We clamp
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* dt so the integrator stays stable — a long stall just means the sim advances a little
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* slowly that frame, which is invisible. (We also sub-step within this cap below.)
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*/
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const PHYSICS_MAX_DT = 1 / 30;
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/** Sub-steps per frame: splitting dt makes the spring/penalty collisions stiffer-stable. */
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const PHYSICS_SUBSTEPS = 2;
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/**
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* Playhead-correction smoothing time constant, in seconds. Governs how fast the
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* rendered playhead absorbs a re-anchor discontinuity at each ~10 Hz push.
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*
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* The problem: the player's position reports are irregular at startup (buffering /
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* playback ramp-up), so each push lands a position that doesn't match where the
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* wall-clock interpolation had advanced to. Hard-anchoring to each push (the prior
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* behaviour) made that gap a visible snap every push — the startup jitter.
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*
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* The fix (classic netcode-style entity reconciliation): the player stays the sole
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* source of truth, but instead of rendering the authoritative position directly, we
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* render authoritative + a small *correction offset* that decays toward zero every
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* frame. On each push we fold the re-anchor discontinuity into that offset so the
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* rendered playhead is continuous across the push, then bleed the offset off over
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* ~this time constant. This eases the snap into a sub-perceptible glide.
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*
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* Why an offset that decays to zero, not an absolute lerp toward target: a lerp
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* toward the target leaves a steady-state lag proportional to velocity (the render
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* always trailing real playback). Decaying the *error* to zero converges the
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* rendered playhead back onto the authoritative one, so once pushes steady the
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* offset is ~0 and behaviour is identical to the old hard-anchor — no lag, and
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* steady-state is unchanged as required.
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*
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* 0.12 s is a sensible default: long enough to dissolve the worst startup snaps
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* (tens of ms of position error), short enough that the correction is imperceptible
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* and the render never trails real playback by more than a few ms. Tunable.
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*/
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const PLAYHEAD_CORRECTION_TIME_CONSTANT_SECONDS = 0.12;
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/**
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* Below this absolute correction (seconds) we snap the offset to 0 and stop easing —
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* an exponential decay never mathematically reaches zero, and carrying a sub-ms
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* residual forever is pointless. ~0.5 ms is well under one frame of motion at any
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* real zoom, so collapsing it is invisible.
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*/
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const PLAYHEAD_CORRECTION_SNAP_SECONDS = 0.0005;
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// ── Diagnostics ──────────────────────────────────────────────────────────────────
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//
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// Set true to surface the init/draw/datum/playback seams to the browser console
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// (all prefixed `[MixVisualizer]`). The error/warn paths fire regardless of this
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// flag — they only trigger on the abnormal path. The verbose `log` paths (datum
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// received/uploaded, first-draw dimensions, GL error after first draw) are gated
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// here so they can be silenced once the renderer is confirmed healthy. Leave it on
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// while the runtime fix is being verified through the browser.
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// NOTE: ON for this visual-iteration pass (Phase 10 W3 rework). Daniel tests in-browser;
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// the resolved navy/moss RGB + FPS lines confirm the fixes. Flip back to false once the
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// look is approved.
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const DEBUG = true;
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const TAG = '[MixVisualizer]';
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function debugLog(...args: unknown[]): void {
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if (DEBUG) console.log(TAG, ...args);
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}
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// ── Theme: the navy↔moss field poles, read live from the active MudBlazor palette. ─
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//
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// The shader cannot resolve `var(--mud-palette-*)` directly — uniforms are plain
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// floats. So we read the computed `--mud-palette-*` custom properties straight off
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// the canvas element (which inherits them from the page), parse them to RGB, and
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// upload them as vec3 colour uniforms. The bespoke light/dark themes swap those vars
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// when dark mode toggles, so re-reading + re-uploading them re-themes the field with
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// no reload. The component just calls `refreshTheme()` after a dark-mode change.
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//
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// Wave 3 binding — the two poles of the morphing colour field (spec §4b/§4c):
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// - `uColorAccent` carries MOSS (the interactive green).
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// - `uColorEdge` carries NAVY (the dark ground / navy-mid).
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// (The names are inherited from the parity two-stop gradient; in Wave 3 they are the
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// two field poles, not a now-line→edge luminance ramp. Kept rather than renamed to
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// avoid touching the bridge's uniform-location cache and the well-tested upload path.)
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//
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// The cross-mode problem (spec §4c, explicit): navy and moss are NOT a single stable
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// pair of CSS vars across both palettes. Navy is `--mud-palette-primary` in LIGHT but
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// the `--mud-palette-background` ground in DARK; moss is `--mud-palette-secondary` in
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// LIGHT but `--mud-palette-primary` in DARK (where green IS primary). No one var holds
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// "navy" or "moss" in both modes. So we detect the mode in JS (by the luminance of the
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// page background — the bespoke dark ground #0D1B2A is near-black, the light ground
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// #FAFAF8 is near-white) and bind the poles per the spec's stated mapping. refreshTheme
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// re-runs this on a dark-mode toggle, so the field re-themes live.
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interface ResolvedTheme {
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/** Moss-green pole RGB [0,1] — uploaded to uColorAccent. */
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accent: [number, number, number];
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/** Navy pole RGB [0,1] — uploaded to uColorEdge. */
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edge: [number, number, number];
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}
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/** sRGB relative luminance (cheap Rec.709 weights) of a normalized RGB triple. */
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function luminance([r, g, b]: [number, number, number]): number {
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return 0.2126 * r + 0.7152 * g + 0.0722 * b;
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}
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/**
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* Read a CSS custom property off an element, falling back if it is empty/undefined.
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* An empty value means the var did not inherit onto the canvas (e.g. the palette is
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* scoped to a wrapper the canvas isn't under), which would silently swap the ribbon
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* colour for the hardcoded default — so warn on it when diagnosing.
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*/
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function readVar(el: Element, name: string, fallback: string): string {
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const v = getComputedStyle(el).getPropertyValue(name).trim();
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if (v.length === 0) {
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if (DEBUG) console.warn(`${TAG} CSS var '${name}' did not resolve off the canvas — using fallback '${fallback}'; ribbon colour may be wrong.`);
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return fallback;
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}
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return v;
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}
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/**
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* Parse a CSS colour string to normalized [0,1] RGB. Handles #rgb / #rrggbb and
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* rgb()/rgba() — the only forms MudBlazor emits for these palette vars. Falls back
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* to mid-grey on anything unrecognised so a parse miss degrades to a visible
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* ribbon rather than black.
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*/
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function parseColor(css: string): [number, number, number] {
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const s = css.trim();
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if (s.startsWith('#')) {
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let hex = s.slice(1);
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if (hex.length === 3) {
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hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
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}
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if (hex.length >= 6) {
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const r = parseInt(hex.slice(0, 2), 16);
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const g = parseInt(hex.slice(2, 4), 16);
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const b = parseInt(hex.slice(4, 6), 16);
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if (!Number.isNaN(r) && !Number.isNaN(g) && !Number.isNaN(b)) {
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return [r / 255, g / 255, b / 255];
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}
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}
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}
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const m = s.match(/rgba?\(\s*([\d.]+)\s*,\s*([\d.]+)\s*,\s*([\d.]+)/i);
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if (m) {
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return [Number(m[1]) / 255, Number(m[2]) / 255, Number(m[3]) / 255];
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}
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return [0.5, 0.5, 0.5];
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}
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// ── Datum: the pre-downloaded loudness profile (spec §F). ────────────────────────
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interface Datum {
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/**
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* GPU texture holding the loudness samples (R8). Laid out as a 2-D grid that
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* respects GL_MAX_TEXTURE_SIZE (see uploadDatum) rather than a 1×N row, which
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* blows past the max texture width for any mix over ~49 s at the ~333 samples/s
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* datum density. The shader reads it with texelFetch (integer addressing), so no
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* hardware filtering is used — see sampleAt for the manual interpolation.
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*/
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texture: WebGLTexture;
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/** Texture width in texels (samples per row). */
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texWidth: number;
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/** Texture height in texels (number of rows). */
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texHeight: number;
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/** Number of real samples in the datum (≤ texWidth*texHeight; the tail row is padded). */
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sampleCount: number;
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/** Total mix duration in seconds — needed to map time <-> sample index. */
|
||
durationSeconds: number;
|
||
/**
|
||
* The decoded loudness bytes [0,255], retained for CPU-side sampling by the physics
|
||
* step (the waveform-collision boundary is sampled per blob per frame — R2 §5). The
|
||
* GPU has its own copy in `texture`; this is the CPU mirror, kept because re-reading
|
||
* the texture back from the GPU each frame would be a stall.
|
||
*/
|
||
samples: Uint8Array;
|
||
}
|
||
|
||
interface Playback {
|
||
/**
|
||
* Last playback head pushed from Blazor, in seconds. This is the *authoritative*
|
||
* position the player last reported — it updates only on the ~10 Hz setPlayback
|
||
* push, NOT every frame. The per-frame scroll uses the interpolated
|
||
* effectivePlayhead (see draw()), anchored on this value.
|
||
*/
|
||
positionSeconds: number;
|
||
/** Whether audio is actively playing — gates the rAF loop so a paused mix stays cool. */
|
||
isPlaying: boolean;
|
||
/**
|
||
* performance.now() (ms) captured when positionSeconds was pushed. The rAF loop
|
||
* advances the playhead by wall-clock elapsed since this anchor so the ribbon
|
||
* scrolls smoothly at the display refresh rate between the sparse ~10 Hz pushes,
|
||
* instead of stepping once per push (the ~10 FPS smoothness bug). Re-anchored on
|
||
* every push, so each push is a small correction rather than a hard reset.
|
||
*/
|
||
pushWallClockMs: number;
|
||
}
|
||
|
||
export interface MixVisualizerHandle {
|
||
setDatum(samplesBase64: string, durationSeconds: number): void;
|
||
setPlayback(positionSeconds: number, isPlaying: boolean): void;
|
||
setZoom(visibleSeconds: number): void;
|
||
/** [0,1]. R2 TEMP: routes the "Bubblyness" knob to lava GRAVITY (R4 renames). */
|
||
setBubblyness(value: number): void;
|
||
/** [0,1]. R2 TEMP: routes the "Detach" knob to lava HEAT (R4 renames). */
|
||
setDetach(value: number): void;
|
||
/** [0,1]. R2 TEMP: routes the "Color-shift" knob to COLLISION STRENGTH (R4 renames). */
|
||
setColorShiftSpeed(value: number): void;
|
||
/** Re-read the palette CSS vars off the canvas (call after a dark-mode toggle). */
|
||
refreshTheme(): void;
|
||
dispose(): void;
|
||
}
|
||
|
||
/**
|
||
* Decode the base64 loudness datum (bytes [0,255]) into a Uint8Array suitable for
|
||
* direct upload as an R8 texture. Done once per datum, off the animation path. We
|
||
* keep the bytes as [0,255] and let the GPU normalize to [0,1] on sample (R8
|
||
* UNORM), which mirrors the predecessor's /255 and avoids a CPU float pass.
|
||
*/
|
||
function decodeSamples(base64: string): Uint8Array {
|
||
const binary = atob(base64);
|
||
const out = new Uint8Array(binary.length);
|
||
for (let i = 0; i < binary.length; i++) {
|
||
out[i] = binary.charCodeAt(i);
|
||
}
|
||
return out;
|
||
}
|
||
|
||
// ── Shaders. ─────────────────────────────────────────────────────────────────────
|
||
//
|
||
// Vertex: trivial pass-through. We draw a single triangle that more than covers the
|
||
// clip-space box ([-1,1]²) so every pixel of the canvas is rasterized once. (One
|
||
// oversized triangle is the standard full-screen trick — cheaper than two and has
|
||
// no diagonal seam.) gl_FragCoord in the fragment shader then gives us the pixel's
|
||
// screen position directly.
|
||
|
||
const VERTEX_SHADER = `#version 300 es
|
||
// Three clip-space vertices forming one big triangle covering [-1,1]².
|
||
const vec2 POSITIONS[3] = vec2[3](
|
||
vec2(-1.0, -1.0),
|
||
vec2( 3.0, -1.0),
|
||
vec2(-1.0, 3.0)
|
||
);
|
||
void main() {
|
||
gl_Position = vec4(POSITIONS[gl_VertexID], 0.0, 1.0);
|
||
}
|
||
`;
|
||
|
||
// Fragment: THE SCROLL + ZOOM MATH (spec §A, §B), ported intact from the Canvas
|
||
// predecessor's per-row loop into a per-fragment evaluation. Read this top to
|
||
// bottom to follow how a quarter-note-@-180-BPM becomes 0.333 s becomes a texture
|
||
// coordinate becomes a lit pixel.
|
||
//
|
||
// Coordinate model (matches the Canvas predecessor exactly):
|
||
// - gl_FragCoord.xy is in device pixels, origin BOTTOM-left in WebGL. The Canvas
|
||
// used a TOP-left origin with Y increasing downward. We flip Y once up front
|
||
// (screenYTop) so all the time math below reads identically to the Canvas
|
||
// version: screenYTop = 0 at the top edge, = uResolution.y at the bottom.
|
||
// - The "now" line is a fixed screen Y: nowY = height * NOW_ANCHOR_FROM_TOP.
|
||
// - Audio flows UP: newer audio is drawn lower and scrolls up past the now line.
|
||
// * audio BELOW the now line (screenYTop > nowY) is the lead-in (not yet played)
|
||
// * audio ABOVE the now line (screenYTop < nowY) is the trail-out (just played)
|
||
//
|
||
// Zoom -> time-span -> pixels:
|
||
// - uVisibleSeconds is the whole window's time span, top to bottom. At max zoom
|
||
// this is MIN_VISIBLE_SECONDS (0.333 s); at min zoom MAX_VISIBLE_SECONDS.
|
||
// - pixelsPerSecond = height / uVisibleSeconds. Smaller visibleSeconds => more px
|
||
// per second => the same audio sweeps the window faster at a fixed playback
|
||
// rate. That IS the Guitar-Hero coupling: apparent scroll speed falls straight
|
||
// out of the zoom, with no separate speed control.
|
||
//
|
||
// Time at a given screen Y:
|
||
// - At nowY the time is uPlayheadSeconds.
|
||
// - Moving DOWN by 1 px (screenYTop +1) adds (1 / pixelsPerSecond) seconds.
|
||
// - So: timeAt(y) = playhead + (screenYTop - nowY) / pixelsPerSecond
|
||
//
|
||
// Sample at a given time:
|
||
// - time / durationSeconds is the normalized position along the mix; multiplied by
|
||
// the sample count it becomes a continuous sample index. sampleAt interpolates
|
||
// between the two bracketing samples by hand (texelFetch + fract lerp) — see the
|
||
// note on its definition for WHY we can't use hardware LINEAR with the 2-D layout.
|
||
// - Outside [0, durationSeconds] we force loudness to 0. That is what gives the
|
||
// "scrolls in from empty / out to empty" behaviour at the very start and end of
|
||
// the mix (spec §A) with no special-casing. (CLAMP_TO_EDGE on the texture would
|
||
// otherwise repeat the edge sample, so we gate explicitly here.)
|
||
|
||
const FRAGMENT_SHADER = `#version 300 es
|
||
precision highp float;
|
||
|
||
uniform vec2 uResolution; // canvas size in device pixels
|
||
uniform float uPlayheadSeconds; // current playback position (per-frame)
|
||
uniform float uTimeSeconds; // monotonic clock (per-frame) — drives field morph
|
||
uniform float uVisibleSeconds; // zoom: window time-span (per change)
|
||
// NOTE: the lava physics params (gravity/heat/collision/density) are NOT shader uniforms
|
||
// in R2 — they drive the CPU physics step, which uploads the resulting uBlobs[]. The old
|
||
// uBubblyness/uDetach/uColorShiftSpeed uniforms are gone from the shader for that reason;
|
||
// the JS handle still receives those control values and routes them to the physics (the
|
||
// R2 TEMP knob re-mapping documented at the control-default consts above).
|
||
uniform float uDurationSeconds; // mix length (per datum)
|
||
uniform vec3 uColorAccent; // MOSS pole of the field (per theme)
|
||
uniform vec3 uColorEdge; // NAVY pole of the field (per theme)
|
||
uniform float uHasDatum; // 1.0 when a datum texture is bound, else 0.0
|
||
uniform sampler2D uDatum; // loudness profile, R8, 2-D grid, NEAREST (texelFetch)
|
||
uniform int uDatumWidth; // datum texture width in texels (samples per row)
|
||
uniform int uDatumSampleCount; // number of real samples (tail row is padded)
|
||
|
||
// ── R2 wax-blob uniforms (the CPU physics step uploads these every frame). ──────────
|
||
// Each blob is packed as a vec4: xy = centre in HEIGHT-NORMALIZED space (pixel/H, so
|
||
// y is 0 at the top edge and 1 at the footer/floor, x spans [0, W/H]); z = radius in
|
||
// the SAME height-normalized unit (so circles are round on screen); w = temperature
|
||
// 0..1 (drives the warm tint on hot rising wax). uBlobCount is how many of the
|
||
// MAX_BLOBS slots are live this frame. Working in height-normalized units keeps the
|
||
// metaball SDF isotropic regardless of the canvas aspect ratio.
|
||
const int MAX_BLOBS = ${MAX_BLOBS};
|
||
uniform vec4 uBlobs[MAX_BLOBS];
|
||
uniform int uBlobCount;
|
||
|
||
out vec4 fragColor;
|
||
|
||
const float NOW_ANCHOR_FROM_TOP = ${NOW_ANCHOR_FROM_TOP.toFixed(4)};
|
||
const float RIBBON_HALF_WIDTH_FRAC = ${RIBBON_HALF_WIDTH_FRAC.toFixed(4)};
|
||
|
||
// ── R2 in-shader tuning constants (Daniel tunes by editing here). ───────────────────
|
||
|
||
// Background opacity of the wax + waveform fill. Kept simple/serviceable for R2 — the
|
||
// beautiful OKLab three-colour gradient is Wave R3. Just enough to read the physics.
|
||
const float RIBBON_OPACITY_R2 = 0.62;
|
||
|
||
// smin blend radius for the wax metaball union, in height-normalized units. Larger = the
|
||
// "necks" where two blobs merge are fatter → a gooier, more-connected wax that splits and
|
||
// recombines (the organic non-circular look the spec wants, §4b). This + varied radii are
|
||
// what kill the "giant disconnected circles" failure.
|
||
const float BLOB_SMOOTHMIN_K = 0.045;
|
||
|
||
// smin blend radius for merging the wax into the WAVEFORM ribbon, so resting/pooled wax
|
||
// reads as continuous with the ribbon surface rather than a disc sitting on a wall.
|
||
const float WAVE_SMOOTHMIN_K = 0.03;
|
||
|
||
// Low-frequency, blob-tied radius wobble: a slow per-blob breathing so each wax shape is
|
||
// organic, not a perfect circle (§4b). This is FLUID-tied noise (keyed to blob identity +
|
||
// the wall clock), NOT the screen-space "dirt" R1 removed (§3) — it travels with the wax.
|
||
const float BLOB_WOBBLE_AMOUNT = 0.12; // ± fraction of radius
|
||
const float BLOB_WOBBLE_RATE = 0.7; // breathing speed (rad/s scale)
|
||
|
||
// Warm tint on hot, rising wax. A hot blob (temperature → 1) shifts slightly toward a
|
||
// warm highlight so the eye reads "this one is rising"; cool wax stays the cool field
|
||
// colour. Serviceable placeholder until R3's real colour model — kept subtle.
|
||
const vec3 HOT_TINT = vec3(0.95, 0.72, 0.45); // warm amber the hottest wax leans toward
|
||
const float HOT_TINT_AMOUNT = 0.35; // max lean at temperature 1 (above ambient)
|
||
|
||
// Fetch one raw sample by its linear index, mapping the 1-D index onto the 2-D
|
||
// texture grid (col = i mod width, row = i / width). texelFetch ignores filtering
|
||
// and wrap modes — it reads the exact texel — so the row-wrap layout is invisible
|
||
// to the caller.
|
||
float fetchSample(int i) {
|
||
int col = i % uDatumWidth;
|
||
int row = i / uDatumWidth;
|
||
return texelFetch(uDatum, ivec2(col, row), 0).r;
|
||
}
|
||
|
||
// Loudness at an absolute mix time, or 0 outside the mix (drives scroll-in/out).
|
||
//
|
||
// Interpolation note: we cannot lean on hardware LINEAR filtering here. The datum
|
||
// is laid across a 2-D grid (1×N would exceed GL_MAX_TEXTURE_SIZE past ~49 s of
|
||
// mix), and a hardware 2D-LINEAR read would blend across the row-wrap seam at the
|
||
// end of every row — sample[width-1] would wrongly bleed into sample[width] of the
|
||
// next row, and bilinear would also pull in the row above/below. So we do the
|
||
// linear interpolation by hand along the TIME axis only: bracket the fractional
|
||
// sample position with the two neighbouring texels, texelFetch each (each correctly
|
||
// mapped to its own 2-D texel), and lerp. Exact, no seam artifact.
|
||
//
|
||
// Texel-centre convention: this reproduces the predecessor's 1-D LINEAR read bit for
|
||
// bit. There, u = t/duration sampled an N-texel LINEAR texture, whose texel centres
|
||
// sit at (i+0.5)/N — so u maps to texel-space position u*N - 0.5, interpolating
|
||
// between floor() and floor()+1 of that, with CLAMP_TO_EDGE at the ends. We mirror
|
||
// exactly that here: the -0.5 and the index clamps to [0, N-1] are the CLAMP_TO_EDGE
|
||
// behaviour at both extremes.
|
||
float sampleAt(float timeSeconds) {
|
||
if (uHasDatum < 0.5) return 0.0;
|
||
if (timeSeconds < 0.0 || timeSeconds >= uDurationSeconds) return 0.0;
|
||
float n = float(uDatumSampleCount);
|
||
// Continuous texel-space position, half-texel shifted to match LINEAR centres.
|
||
float p = (timeSeconds / uDurationSeconds) * n - 0.5;
|
||
int i0 = clamp(int(floor(p)), 0, uDatumSampleCount - 1);
|
||
int i1 = clamp(int(floor(p)) + 1, 0, uDatumSampleCount - 1);
|
||
float f = clamp(p - floor(p), 0.0, 1.0);
|
||
return mix(fetchSample(i0), fetchSample(i1), f);
|
||
}
|
||
|
||
// ════════════════════════════════════════════════════════════════════════════════════
|
||
// R2 — wax metaballs + waveform SDF. The blobs are integrated on the CPU (see the JS
|
||
// physics step) and uploaded as uBlobs[]; the shader composites them with smin and the
|
||
// waveform ribbon into one liquid surface, then shades it with a simple theme fill.
|
||
// ════════════════════════════════════════════════════════════════════════════════════
|
||
|
||
// ── Value-noise (used now only for the organic, blob-tied radius wobble). ────────────
|
||
// A standard hash → smooth value-noise. Cheap (a few mixes), no texture lookup, and
|
||
// continuous. Fed blob-identity + the wall clock it gives each wax shape its own slow
|
||
// breathing so the silhouette is organic rather than a perfect circle (§4b).
|
||
float hash21(vec2 p) {
|
||
p = fract(p * vec2(123.34, 345.45));
|
||
p += dot(p, p + 34.345);
|
||
return fract(p.x * p.y);
|
||
}
|
||
float valueNoise(vec2 p) {
|
||
vec2 i = floor(p);
|
||
vec2 f = fract(p);
|
||
// Smoothstep (Hermite) interpolation of the four lattice corners — C1-continuous.
|
||
vec2 u = f * f * (3.0 - 2.0 * f);
|
||
float a = hash21(i + vec2(0.0, 0.0));
|
||
float b = hash21(i + vec2(1.0, 0.0));
|
||
float c = hash21(i + vec2(0.0, 1.0));
|
||
float d = hash21(i + vec2(1.0, 1.0));
|
||
return mix(mix(a, b, u.x), mix(c, d, u.x), u.y);
|
||
}
|
||
|
||
// ── Signed-distance primitives + smooth-min (the metaball machinery). ───────────────
|
||
// Circle SDF (a metaball centre) — the wax blob primitive.
|
||
float sdCircle(vec2 p, float r) {
|
||
return length(p) - r;
|
||
}
|
||
// Polynomial smooth-min (Inigo Quilez). Blends two SDFs into one continuous surface —
|
||
// the metaball union. k controls the blend radius (the size of the liquid "neck" where
|
||
// two blobs merge). As k→0 it becomes a hard min (discrete shapes); larger k fuses them.
|
||
float smin(float a, float b, float k) {
|
||
float h = clamp(0.5 + 0.5 * (b - a) / k, 0.0, 1.0);
|
||
return mix(b, a, h) - k * h * (1.0 - h);
|
||
}
|
||
|
||
// ── The waveform ribbon SDF, in HEIGHT-NORMALIZED space (negative inside). ──────────
|
||
//
|
||
// The waveform is the same symmetric ±loudness ribbon about the centre line as before,
|
||
// but evaluated in height-normalized coords (pixel/H) so it shares one space with the
|
||
// wax blobs. p = (x, y) where x ∈ [0, W/H] across the canvas and y ∈ [0, 1] top→bottom.
|
||
// We map the row's mix-time → loudness → a half-width about the centre x, and return the
|
||
// distance to that vertical ribbon band. Loudness at neighbour rows is NOT re-stacked
|
||
// here (the per-row geometry from Wave 1 is already smooth); the band is the ribbon.
|
||
float waveformSdf(vec2 p, float aspect, float nowYn, float secondsPerHeight) {
|
||
// Mix-time at this row: rows below the now-line are future audio, above are past.
|
||
float t = uPlayheadSeconds + (p.y - nowYn) * secondsPerHeight;
|
||
float amp = sampleAt(t); // loudness 0..1 at this row
|
||
float centreX = aspect * 0.5; // canvas centre x in height-norm units
|
||
float halfW = amp * (aspect * 0.5) * RIBBON_HALF_WIDTH_FRAC; // ribbon half-width here
|
||
// Distance to a centred vertical band of half-width halfW: |x − centre| − halfW.
|
||
// Negative inside the band, positive outside. (A pure horizontal band; the vertical
|
||
// extent is the whole column, which is what the scrolling ribbon is.)
|
||
return abs(p.x - centreX) - halfW;
|
||
}
|
||
|
||
// ── The combined wax + waveform liquid SDF at a height-normalized point. ─────────────
|
||
//
|
||
// Unions all live wax blobs (smin metaballs) and the waveform ribbon into one continuous
|
||
// surface. The blob radii carry a slow blob-tied wobble so each is organic, not a perfect
|
||
// circle. Returns the signed distance and, via out params, the nearest-blob temperature
|
||
// (for the warm hot-wax tint) and whether the point is dominated by wax vs. ribbon.
|
||
float liquidSdf(vec2 p, float aspect, float nowYn, float secondsPerHeight,
|
||
out float hotOut) {
|
||
// Waveform ribbon first — the always-present base surface.
|
||
float field = waveformSdf(p, aspect, nowYn, secondsPerHeight);
|
||
|
||
float hotAccum = 0.0;
|
||
float hotWeight = 0.0;
|
||
|
||
// Union every live wax blob. Bounded loop to MAX_BLOBS; uBlobCount gates the live set.
|
||
for (int i = 0; i < MAX_BLOBS; i++) {
|
||
if (i >= uBlobCount) break;
|
||
vec4 b = uBlobs[i];
|
||
vec2 c = b.xy; // centre, height-norm
|
||
float r = b.z; // radius, height-norm
|
||
float temp = b.w; // temperature 0..1
|
||
|
||
// Organic radius wobble: a slow per-blob breathing (blob-tied + wall clock), so
|
||
// the silhouette is never a clean circle. Fluid-tied, not screen-space (§3 ok).
|
||
float wob = (valueNoise(vec2(float(i) * 1.37, uTimeSeconds * BLOB_WOBBLE_RATE)) - 0.5)
|
||
* 2.0 * BLOB_WOBBLE_AMOUNT;
|
||
float rr = r * (1.0 + wob);
|
||
|
||
float blob = sdCircle(p - c, rr);
|
||
field = smin(field, blob, BLOB_SMOOTHMIN_K);
|
||
|
||
// Weight this blob's temperature by proximity so the tint follows the nearest wax.
|
||
float prox = clamp(1.0 - (blob / max(rr, 1e-3)), 0.0, 1.0);
|
||
hotAccum += temp * prox;
|
||
hotWeight += prox;
|
||
}
|
||
|
||
hotOut = hotWeight > 1e-3 ? hotAccum / hotWeight : 0.0;
|
||
return field;
|
||
}
|
||
|
||
void main() {
|
||
float w = uResolution.x;
|
||
float h = uResolution.y;
|
||
|
||
// Empty backdrop when there is no datum (no thin-centre-line artifact — Wave 1 note).
|
||
if (uHasDatum < 0.5) {
|
||
fragColor = vec4(0.0);
|
||
return;
|
||
}
|
||
|
||
// Height-normalized fragment coordinate (pixel / H), top-left origin, y down. This is
|
||
// the shared space the CPU physics works in — the blob uniforms are already in it.
|
||
float aspect = w / h; // canvas width in height units
|
||
vec2 p = vec2(gl_FragCoord.x / h, (h - gl_FragCoord.y) / h);
|
||
|
||
float nowYn = NOW_ANCHOR_FROM_TOP; // now-line, height-norm (y ∈ [0,1])
|
||
float secondsPerHeight = uVisibleSeconds; // one full height spans uVisibleSeconds
|
||
|
||
// ── Evaluate the combined liquid SDF + its gradient (the surface normal). ──────────
|
||
// Central differences in height-norm space; the step is one device pixel = 1/h.
|
||
float hot;
|
||
float d = liquidSdf(p, aspect, nowYn, secondsPerHeight, hot);
|
||
|
||
float e = 1.0 / h; // one-pixel step in height-norm units
|
||
float ig;
|
||
float dRx = liquidSdf(p + vec2(e, 0.0), aspect, nowYn, secondsPerHeight, ig);
|
||
float dLx = liquidSdf(p - vec2(e, 0.0), aspect, nowYn, secondsPerHeight, ig);
|
||
float dDy = liquidSdf(p + vec2(0.0, e), aspect, nowYn, secondsPerHeight, ig);
|
||
float dUy = liquidSdf(p - vec2(0.0, e), aspect, nowYn, secondsPerHeight, ig);
|
||
vec2 grad = vec2(dRx - dLx, dDy - dUy);
|
||
vec2 normal = length(grad) > 1e-5 ? normalize(grad) : vec2(0.0, -1.0);
|
||
|
||
// Inside-ness: SDF negative = inside. Feather ~1.2px (in height-norm units) for an
|
||
// anti-aliased edge instead of a hard chart line (no blur — spec §2/§3).
|
||
float pxFeather = 1.2 / h;
|
||
float inside = 1.0 - smoothstep(-pxFeather, pxFeather, d);
|
||
if (inside <= 0.0) { fragColor = vec4(0.0); return; }
|
||
|
||
// ── Simple serviceable theme fill (R3 replaces with the OKLab three-colour gradient).
|
||
// Linear A→B from the centre line outward: NAVY (uColorEdge) at the root, MOSS
|
||
// (uColorAccent) at the extended edge. Just enough colour to read the physics; NOT the
|
||
// final colour model. No HSL, no vivify, no glass — those are gone (R3 owns colour).
|
||
float xnAbs = clamp(abs(p.x - aspect * 0.5) / (aspect * 0.5), 0.0, 1.0);
|
||
vec3 fill = mix(uColorEdge, uColorAccent, xnAbs);
|
||
|
||
// Warm tint on hot, rising wax so the eye reads convection (serviceable, R3-subordinate).
|
||
float hotLean = clamp((hot - ${TEMP_AMBIENT.toFixed(2)}) * 2.0, 0.0, 1.0) * HOT_TINT_AMOUNT;
|
||
fill = mix(fill, HOT_TINT, hotLean);
|
||
|
||
// A soft top-light shade off the surface normal so the wax has form (a single lazy
|
||
// gradient, not the old four-part glass). Keeps it from reading flat without competing
|
||
// with the (future) colour model.
|
||
float lightUp = clamp(dot(normal, vec2(0.0, -1.0)) * 0.5 + 0.5, 0.0, 1.0);
|
||
fill *= mix(0.82, 1.12, lightUp);
|
||
|
||
float alpha = inside * RIBBON_OPACITY_R2;
|
||
fragColor = vec4(fill * alpha, alpha); // pre-multiplied for ONE/ONE_MINUS_SRC_ALPHA
|
||
}
|
||
`;
|
||
|
||
/** Compile one shader stage, throwing with the info log on failure. */
|
||
function compileShader(gl: WebGL2RenderingContext, type: number, source: string): WebGLShader {
|
||
const shader = gl.createShader(type);
|
||
if (!shader) throw new Error('MixVisualizer: gl.createShader returned null.');
|
||
gl.shaderSource(shader, source);
|
||
gl.compileShader(shader);
|
||
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
|
||
const log = gl.getShaderInfoLog(shader);
|
||
gl.deleteShader(shader);
|
||
throw new Error(`MixVisualizer: shader compile failed: ${log}`);
|
||
}
|
||
return shader;
|
||
}
|
||
|
||
/** Link the vertex + fragment shaders into a program, throwing on failure. */
|
||
function linkProgram(gl: WebGL2RenderingContext): WebGLProgram {
|
||
const vert = compileShader(gl, gl.VERTEX_SHADER, VERTEX_SHADER);
|
||
const frag = compileShader(gl, gl.FRAGMENT_SHADER, FRAGMENT_SHADER);
|
||
const program = gl.createProgram();
|
||
if (!program) throw new Error('MixVisualizer: gl.createProgram returned null.');
|
||
gl.attachShader(program, vert);
|
||
gl.attachShader(program, frag);
|
||
gl.linkProgram(program);
|
||
// Shaders can be deleted after link — the program retains the compiled code.
|
||
gl.deleteShader(vert);
|
||
gl.deleteShader(frag);
|
||
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
|
||
const log = gl.getProgramInfoLog(program);
|
||
gl.deleteProgram(program);
|
||
throw new Error(`MixVisualizer: program link failed: ${log}`);
|
||
}
|
||
return program;
|
||
}
|
||
|
||
/** The no-op handle returned when WebGL2 is unavailable or setup fails. */
|
||
function noopHandle(): MixVisualizerHandle {
|
||
return {
|
||
setDatum() {},
|
||
setPlayback() {},
|
||
setZoom() {},
|
||
setBubblyness() {},
|
||
setDetach() {},
|
||
setColorShiftSpeed() {},
|
||
refreshTheme() {},
|
||
dispose() {},
|
||
};
|
||
}
|
||
|
||
export function create(canvas: HTMLCanvasElement): MixVisualizerHandle {
|
||
// premultipliedAlpha so the translucent ribbon composites correctly over the
|
||
// page; antialias off (the soft-edge smoothstep handles AA in-shader, and MSAA
|
||
// would cost fill rate we don't need for a backdrop).
|
||
const maybeGl = canvas.getContext('webgl2', {
|
||
alpha: true,
|
||
premultipliedAlpha: true,
|
||
antialias: false,
|
||
});
|
||
if (!maybeGl) {
|
||
// No WebGL2 (old engine / disabled): hand back a no-op handle so the
|
||
// component still functions as a plain backdrop (mirrors the predecessor's
|
||
// no-2d-context fallback, now guarding against no-WebGL2).
|
||
console.error(`${TAG} getContext('webgl2') returned null — WebGL2 unavailable; rendering a plain backdrop.`);
|
||
return noopHandle();
|
||
}
|
||
// Non-null binding so the closures below keep the narrowing (TS does not carry
|
||
// control-flow narrowing of a captured `const` into nested functions).
|
||
const gl: WebGL2RenderingContext = maybeGl;
|
||
|
||
// GL_MAX_TEXTURE_SIZE is a per-context constant — query it once. The datum is
|
||
// laid out across a 2-D grid no wider than this (see uploadDatum); a 1×N row
|
||
// would exceed it for any mix over ~49 s at the ~333 samples/s datum density,
|
||
// and texImage2D would reject the upload (the bug this fix addresses).
|
||
const maxTextureSize: number = gl.getParameter(gl.MAX_TEXTURE_SIZE) as number;
|
||
|
||
let program: WebGLProgram;
|
||
try {
|
||
program = linkProgram(gl);
|
||
} catch (err) {
|
||
// A compile/link failure on an exotic driver should degrade to the plain
|
||
// backdrop, not crash the page. Log for diagnosis; return the no-op handle.
|
||
console.error(`${TAG} shader compile/link failed; rendering a plain backdrop.`, err);
|
||
return noopHandle();
|
||
}
|
||
|
||
// An empty VAO is still required in WebGL2 core to issue a draw; the vertex
|
||
// shader sources its positions from gl_VertexID, so no attribute buffers.
|
||
const vao = gl.createVertexArray();
|
||
|
||
// Cache uniform locations once. A null here for a uniform we actually upload
|
||
// means either the name is misspelled or the GLSL compiler dead-stripped it
|
||
// (it isn't reachable in the shader) — both of which silently break a uniform's
|
||
// effect, so surface them. No reserved-unused exemptions remain: every uniform
|
||
// below is genuinely consumed by the R2 shader (the old inert Wave-3 control
|
||
// uniforms are gone — the lava params drive the CPU physics, not the shader).
|
||
const u = {
|
||
resolution: gl.getUniformLocation(program, 'uResolution'),
|
||
playheadSeconds: gl.getUniformLocation(program, 'uPlayheadSeconds'),
|
||
timeSeconds: gl.getUniformLocation(program, 'uTimeSeconds'),
|
||
visibleSeconds: gl.getUniformLocation(program, 'uVisibleSeconds'),
|
||
durationSeconds: gl.getUniformLocation(program, 'uDurationSeconds'),
|
||
colorAccent: gl.getUniformLocation(program, 'uColorAccent'),
|
||
colorEdge: gl.getUniformLocation(program, 'uColorEdge'),
|
||
hasDatum: gl.getUniformLocation(program, 'uHasDatum'),
|
||
datum: gl.getUniformLocation(program, 'uDatum'),
|
||
datumWidth: gl.getUniformLocation(program, 'uDatumWidth'),
|
||
datumSampleCount: gl.getUniformLocation(program, 'uDatumSampleCount'),
|
||
blobs: gl.getUniformLocation(program, 'uBlobs'),
|
||
blobCount: gl.getUniformLocation(program, 'uBlobCount'),
|
||
};
|
||
for (const [name, loc] of Object.entries(u)) {
|
||
if (loc === null) {
|
||
console.warn(`${TAG} uniform '${name}' resolved to null — it will have no effect (misspelled or dead-stripped from the shader).`);
|
||
}
|
||
}
|
||
|
||
// ── Mutable state, fed by the component through the handle. ──────────────────
|
||
let datum: Datum | null = null;
|
||
let playback: Playback = { positionSeconds: 0, isPlaying: false, pushWallClockMs: performance.now() };
|
||
let visibleSeconds = DEFAULT_VISIBLE_SECONDS;
|
||
|
||
// ── Lava physics control values (the R2 TEMP knob re-mapping — see the control-default
|
||
// consts at the top of this file). These are the dials the existing knobs feed, routed
|
||
// here by the handle setters. They drive the CPU physics step below, NOT a shader uniform.
|
||
let lavaHeat = DEFAULT_DETACH; // "Detach" knob → heat
|
||
let lavaGravity = DEFAULT_BUBBLYNESS; // "Bubblyness" knob → gravity
|
||
let collisionStrength = DEFAULT_COLOR_SHIFT_SPEED; // "Color-shift" knob → collision hardness
|
||
let blobDensity = DEFAULT_BLOB_DENSITY; // no live knob this wave (R4 adds it)
|
||
|
||
/**
|
||
* The *authoritative* playhead for this instant: the last pushed position advanced
|
||
* by wall-clock elapsed since the push while playing, or the pushed position while
|
||
* idle. The player remains the sole source of truth — this is display-only and is
|
||
* never written back (read-only contract, spec §D / §5.10). This is the target the
|
||
* rendered playhead converges onto; the shader uploads the *rendered* value (see
|
||
* renderedPlayhead) so a re-anchor at a push doesn't snap on screen.
|
||
*/
|
||
function effectivePlayhead(): number {
|
||
if (!playback.isPlaying) return playback.positionSeconds;
|
||
const elapsedSeconds = (performance.now() - playback.pushWallClockMs) / 1000;
|
||
return playback.positionSeconds + elapsedSeconds;
|
||
}
|
||
|
||
// ── Rendered-playhead reconciliation (startup-jitter fix). ───────────────────────
|
||
//
|
||
// The shader scrolls to renderedPlayhead() = effectivePlayhead() + correctionOffset,
|
||
// where correctionOffset decays exponentially toward 0 each frame (time constant
|
||
// PLAYHEAD_CORRECTION_TIME_CONSTANT_SECONDS). At a push, setPlayback re-anchors the
|
||
// authoritative target; without correction that re-anchor would teleport the
|
||
// rendered playhead. Instead we *preserve the rendered position across the push* by
|
||
// folding the discontinuity into correctionOffset (see setPlayback), then bleed it
|
||
// off — turning each snap into a brief, sub-perceptible glide.
|
||
//
|
||
// Steady-state: when pushes are regular, the authoritative target barely moves at a
|
||
// push, so the folded discontinuity is ~0 and correctionOffset stays ~0 — behaviour
|
||
// is then identical to uploading effectivePlayhead() directly (the prior renderer).
|
||
let correctionOffset = 0;
|
||
let lastRenderWallClockMs = performance.now();
|
||
|
||
/**
|
||
* The playhead the shader actually scrolls to this frame. Equals the authoritative
|
||
* effectivePlayhead() plus a correction offset that decays to zero, so the rendered
|
||
* motion is continuous across the irregular startup pushes. Advances the decay by
|
||
* real elapsed time since the previous render, making it frame-rate-independent
|
||
* (same convergence on a 60 Hz and a 144 Hz display). Call exactly once per drawn
|
||
* frame — it mutates the decay state.
|
||
*/
|
||
function renderedPlayhead(): number {
|
||
const nowMs = performance.now();
|
||
const dtSeconds = Math.max(0, (nowMs - lastRenderWallClockMs) / 1000);
|
||
lastRenderWallClockMs = nowMs;
|
||
|
||
// Exponential decay of the error toward 0: offset *= e^(-dt/tau). Frame-rate
|
||
// independent — the fraction retained depends only on wall-clock dt, not frame
|
||
// count. Snap tiny residuals to 0 (an exponential never reaches it).
|
||
if (correctionOffset !== 0) {
|
||
correctionOffset *= Math.exp(-dtSeconds / PLAYHEAD_CORRECTION_TIME_CONSTANT_SECONDS);
|
||
if (Math.abs(correctionOffset) < PLAYHEAD_CORRECTION_SNAP_SECONDS) correctionOffset = 0;
|
||
}
|
||
|
||
return effectivePlayhead() + correctionOffset;
|
||
}
|
||
|
||
/**
|
||
* Resolve the navy↔moss field poles from the live palette vars on the canvas.
|
||
*
|
||
* Detects light vs dark by the page background luminance, then binds each pole to
|
||
* the var that carries that identity in the active palette (see the note above the
|
||
* ResolvedTheme interface for why no single var works across both modes):
|
||
* LIGHT: moss = --mud-palette-secondary (#3D7A68), navy = --mud-palette-primary (#17283f)
|
||
* DARK: moss = --mud-palette-primary (#3D7A68), navy = --mud-palette-background (#0D1B2A)
|
||
* This yields the maximal navy↔moss spread the field wants in either theme.
|
||
*/
|
||
function readTheme(): ResolvedTheme {
|
||
const background = parseColor(readVar(canvas, '--mud-palette-background', '#FAFAF8'));
|
||
const isDark = luminance(background) < 0.5;
|
||
|
||
const moss = isDark
|
||
? parseColor(readVar(canvas, '--mud-palette-primary', '#3D7A68'))
|
||
: parseColor(readVar(canvas, '--mud-palette-secondary', '#3D7A68'));
|
||
const navy = isDark
|
||
? background // the dark ground (#0D1B2A) IS the navy pole on dark
|
||
: parseColor(readVar(canvas, '--mud-palette-primary', '#17283f'));
|
||
|
||
const resolved: ResolvedTheme = { accent: moss, edge: navy };
|
||
// Report BOTH poles the R2 fill will use, as 0-255 RGB + relative luminance. (The
|
||
// rich OKLab colour model is Wave R3; R2 just does a straight A→B theme fill — this
|
||
// line confirms the navy/moss poles resolved off the canvas vars in the active mode.)
|
||
const fmt = (c: [number, number, number]) =>
|
||
`rgb(${Math.round(c[0] * 255)},${Math.round(c[1] * 255)},${Math.round(c[2] * 255)}) lum=${luminance(c).toFixed(2)}`;
|
||
debugLog(`theme resolved (${isDark ? 'dark' : 'light'}) — MOSS(accent)=${fmt(moss)} NAVY(edge)=${fmt(navy)}.`);
|
||
return resolved;
|
||
}
|
||
|
||
let theme: ResolvedTheme = readTheme();
|
||
|
||
// ════════════════════════════════════════════════════════════════════════════════
|
||
// R2 — the CPU wax-blob physics. Integrated each frame (real dt), then packed into
|
||
// `blobUpload` and sent to the shader as uBlobs[]. Allocation-free per frame: the
|
||
// blob pool and the upload buffer are built once here and mutated in place.
|
||
//
|
||
// Space: height-normalized (pixel / canvasHeight). y ∈ [0,1] top→floor, x ∈ [0, aspect]
|
||
// where aspect = canvasWidth/canvasHeight. The FLOOR is y = 1 (the canvas bottom edge,
|
||
// already CSS-clipped to the footer top in R1). One isotropic unit → round blobs.
|
||
// ════════════════════════════════════════════════════════════════════════════════
|
||
|
||
interface Blob {
|
||
x: number; y: number; // centre, height-norm
|
||
vx: number; vy: number; // velocity, height-norm/s
|
||
r: number; // radius, height-norm (fixed per blob, density-biased)
|
||
temp: number; // temperature 0..1
|
||
}
|
||
|
||
// The blob pool — MAX_BLOBS slots, all constructed once. liveCount (≤ MAX_BLOBS,
|
||
// driven by the density dial) decides how many we simulate + upload this frame.
|
||
const blobs: Blob[] = [];
|
||
// The packed upload buffer (vec4 per blob). Reused every frame — no per-frame alloc.
|
||
const blobUpload = new Float32Array(MAX_BLOBS * 4);
|
||
|
||
/** Cheap deterministic PRNG (mulberry32) so blob spawn is varied but reproducible. */
|
||
function makeRng(seed: number): () => number {
|
||
let s = seed >>> 0;
|
||
return () => {
|
||
s = (s + 0x6d2b79f5) >>> 0;
|
||
let t = s;
|
||
t = Math.imul(t ^ (t >>> 15), t | 1);
|
||
t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
|
||
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
|
||
};
|
||
}
|
||
const rng = makeRng(0x1a2b3c4d);
|
||
|
||
/** Construct (or re-seed) one blob at a random spot near the floor, ready to be heated. */
|
||
function seedBlob(b: Blob, aspect: number): void {
|
||
// Density biases radius toward the small end as it rises (more, smaller blobs).
|
||
const radiusBias = 1 - blobDensity * 0.6; // density 0 → big, density 1 → smaller
|
||
const r = (BLOB_RADIUS_MIN + rng() * (BLOB_RADIUS_MAX - BLOB_RADIUS_MIN)) * radiusBias;
|
||
b.r = r;
|
||
b.x = r + rng() * Math.max(aspect - 2 * r, 0.001); // somewhere across the width
|
||
b.y = 1 - r - rng() * 0.1; // pooled near the floor
|
||
b.vx = 0;
|
||
b.vy = 0;
|
||
b.temp = rng() * 0.3; // cool to start (heats at the floor)
|
||
}
|
||
|
||
/** (Re)build the whole pool — called once at setup and whenever the canvas aspect is first known. */
|
||
function initBlobs(aspect: number): void {
|
||
blobs.length = 0;
|
||
for (let i = 0; i < MAX_BLOBS; i++) {
|
||
const b: Blob = { x: 0, y: 0, vx: 0, vy: 0, r: 0, temp: 0 };
|
||
seedBlob(b, aspect);
|
||
blobs.push(b);
|
||
}
|
||
}
|
||
let blobsInitialized = false;
|
||
|
||
/** Live blob count for the current density dial, within [MIN_BLOB_COUNT, MAX_BLOBS]. */
|
||
function liveBlobCount(): number {
|
||
return Math.round(MIN_BLOB_COUNT + blobDensity * (MAX_BLOBS - MIN_BLOB_COUNT));
|
||
}
|
||
|
||
/**
|
||
* CPU loudness sample at an absolute mix time, in [0,1], or 0 outside the mix. This
|
||
* mirrors the shader's sampleAt() (same texel-centre convention) so the CPU collision
|
||
* boundary matches the rendered waveform exactly. Reads the retained datum.samples.
|
||
*/
|
||
function sampleLoudnessAt(timeSeconds: number): number {
|
||
const d = datum;
|
||
if (!d || timeSeconds < 0 || timeSeconds >= d.durationSeconds) return 0;
|
||
const n = d.sampleCount;
|
||
const p = (timeSeconds / d.durationSeconds) * n - 0.5;
|
||
const i0 = Math.min(Math.max(Math.floor(p), 0), n - 1);
|
||
const i1 = Math.min(Math.max(Math.floor(p) + 1, 0), n - 1);
|
||
const f = Math.min(Math.max(p - Math.floor(p), 0), 1);
|
||
const s0 = d.samples[i0] / 255;
|
||
const s1 = d.samples[i1] / 255;
|
||
return s0 + (s1 - s0) * f;
|
||
}
|
||
|
||
/** The heat dial's transfer function: dial 0..1 → how hard the floor pumps heat in.
|
||
* Designed so dial 0 = NO floor heating (wax rests, collision-only — §4c endpoint) and
|
||
* dial 1 = vigorous heating (many blobs go buoyant per second). A slight ease-in (square
|
||
* toe) keeps the low end gentle so small dial moves near 0 don't suddenly erupt. */
|
||
function heatScaleFromDial(dial: number): number {
|
||
const d = Math.min(Math.max(dial, 0), 1);
|
||
return d * d * (3 - 2 * d); // smoothstep: flat at 0, steep in the middle, flat at 1
|
||
}
|
||
|
||
/** The collision-strength transfer: dial 0 = soft (penalty-spring, absorptive),
|
||
* dial 1 = hard (elastic, high restitution). Returns the restitution coefficient to
|
||
* use; the penalty-spring stiffness is held constant and the IMPULSE is scaled by the
|
||
* same dial so soft = mostly spring/no-bounce, hard = full elastic reflection (§5c). */
|
||
function restitution(soft: number, hard: number): number {
|
||
const d = Math.min(Math.max(collisionStrength, 0), 1);
|
||
return soft + (hard - soft) * d;
|
||
}
|
||
|
||
/**
|
||
* Advance the physics by dt seconds. Sub-stepped for spring stability. The collision
|
||
* model: blob↔floor (soft contact), blob↔waveform (elastic deflect off the ribbon
|
||
* surface normal, always on), blob↔blob (elastic, soft↔hard via the strength dial).
|
||
*/
|
||
function stepPhysics(dtTotal: number): void {
|
||
if (canvas.height <= 0) return;
|
||
const aspect = canvas.width / canvas.height;
|
||
|
||
if (!blobsInitialized) {
|
||
initBlobs(aspect);
|
||
blobsInitialized = true;
|
||
}
|
||
|
||
const count = liveBlobCount();
|
||
const heatScale = heatScaleFromDial(lavaHeat);
|
||
const gravity = GRAVITY_ACCEL_MIN + lavaGravity * (GRAVITY_ACCEL_MAX - GRAVITY_ACCEL_MIN);
|
||
const collideRest = restitution(BLOB_RESTITUTION_SOFT, BLOB_RESTITUTION_HARD);
|
||
const waveRest = restitution(WAVE_RESTITUTION_SOFT, WAVE_RESTITUTION_HARD);
|
||
const collideHardness = Math.min(Math.max(collisionStrength, 0), 1);
|
||
|
||
// Mix-time mapping at the current playhead (the waveform a blob's row sits over).
|
||
const nowYn = NOW_ANCHOR_FROM_TOP;
|
||
const secondsPerHeight = visibleSeconds;
|
||
const centreX = aspect * 0.5;
|
||
const maxHalf = (aspect * 0.5) * RIBBON_HALF_WIDTH_FRAC;
|
||
const playhead = effectivePlayhead();
|
||
|
||
const dt = Math.min(dtTotal, PHYSICS_MAX_DT) / PHYSICS_SUBSTEPS;
|
||
|
||
for (let s = 0; s < PHYSICS_SUBSTEPS; s++) {
|
||
// ── Per-blob: heat exchange, buoyancy, gravity, damping, floor contact. ──
|
||
for (let i = 0; i < count; i++) {
|
||
const b = blobs[i];
|
||
|
||
// Heat exchange: floor heats (× heat dial), top cools, all relax to ambient.
|
||
const distFromFloor = 1 - b.y;
|
||
const distFromTop = b.y;
|
||
if (distFromFloor < HEAT_FLOOR_ZONE) {
|
||
const near = 1 - distFromFloor / HEAT_FLOOR_ZONE; // 1 at floor → 0 at zone edge
|
||
b.temp += (1 - b.temp) * HEAT_FLOOR_RATE * heatScale * near * dt;
|
||
}
|
||
if (distFromTop < HEAT_TOP_ZONE) {
|
||
const near = 1 - distFromTop / HEAT_TOP_ZONE;
|
||
b.temp += (0 - b.temp) * HEAT_TOP_RATE * near * dt;
|
||
}
|
||
b.temp += (TEMP_AMBIENT - b.temp) * HEAT_AMBIENT_RATE * dt;
|
||
b.temp = Math.min(Math.max(b.temp, 0), 1);
|
||
|
||
// Forces: gravity down (+y), buoyancy from temperature (up = −y when hot).
|
||
const buoyancy = BUOYANCY_COEFF * heatScale * (b.temp - TEMP_AMBIENT);
|
||
b.vy += (gravity - buoyancy) * dt;
|
||
|
||
// Viscous damping (lazy wax): frame-rate-independent exponential decay.
|
||
const damp = Math.exp(-VISCOUS_DAMPING * dt);
|
||
b.vx *= damp;
|
||
b.vy *= damp;
|
||
|
||
// Integrate position.
|
||
b.x += b.vx * dt;
|
||
b.y += b.vy * dt;
|
||
|
||
// Floor: soft contact spring + extra damping so resting wax pools and flattens.
|
||
const floorY = 1 - b.r;
|
||
if (b.y > floorY) {
|
||
const pen = b.y - floorY;
|
||
b.vy -= FLOOR_SPRING * pen * dt; // spring pushes up out of the floor
|
||
if (b.vy > 0) b.vy *= Math.exp(-FLOOR_CONTACT_DAMPING * dt); // kill the downward drive
|
||
b.y = floorY + pen * 0.5; // ease the penetration out (soft, no snap)
|
||
}
|
||
// Ceiling: a gentle clamp so a very hot blob doesn't fly off-screen — it cools
|
||
// at the top and falls back; just keep it inside the box.
|
||
const ceilY = b.r;
|
||
if (b.y < ceilY) { b.y = ceilY; if (b.vy < 0) b.vy = 0; }
|
||
// Side walls: reflect softly so wax stays on screen.
|
||
if (b.x < b.r) { b.x = b.r; if (b.vx < 0) b.vx = -b.vx * 0.3; }
|
||
if (b.x > aspect - b.r) { b.x = aspect - b.r; if (b.vx > 0) b.vx = -b.vx * 0.3; }
|
||
}
|
||
|
||
// ── Blob ↔ waveform boundary (always on, independent of heat — §5b). ──
|
||
// The waveform is a centred vertical band of half-width = loudness(row). A blob
|
||
// whose centre is within (halfWidth + r) of the centre line penetrates it and is
|
||
// pushed out along the band's surface normal (horizontal). Read-only authority:
|
||
// the waveform is never moved, only the wax responds.
|
||
for (let i = 0; i < count; i++) {
|
||
const b = blobs[i];
|
||
const t = playhead + (b.y - nowYn) * secondsPerHeight;
|
||
const amp = sampleLoudnessAt(t);
|
||
if (amp <= 0) continue;
|
||
const halfW = amp * maxHalf;
|
||
const dx = b.x - centreX;
|
||
const sideSign = dx >= 0 ? 1 : -1; // outward surface normal (in x)
|
||
const penetration = halfW + b.r - Math.abs(dx);
|
||
if (penetration > 0) {
|
||
// Soft penalty (the soft end of the dial): a spring proportional to the
|
||
// penetration depth pushes the wax out along the normal. Stronger as the
|
||
// dial → soft so the soft regime still recovers, just gently.
|
||
b.vx += sideSign * WAVE_COLLIDE_SPRING * penetration * dt * (1 - collideHardness * 0.5);
|
||
|
||
// Hard elastic (the hard end): reflect the velocity component going INTO
|
||
// the ribbon back out, scaled by restitution × hardness. inwardSpeed > 0
|
||
// means the blob is moving toward the centre line (into the surface).
|
||
const inwardSpeed = -sideSign * b.vx;
|
||
if (inwardSpeed > 0) {
|
||
// Remove the inward component and add back a restituted outward one.
|
||
b.vx += sideSign * inwardSpeed * (1 + waveRest) * collideHardness;
|
||
}
|
||
|
||
// Positional push-out: firm at the hard end (no penetration allowed),
|
||
// partial at the soft end (wax squishes in then eases out via the spring).
|
||
b.x += sideSign * penetration * (0.3 + 0.7 * collideHardness);
|
||
}
|
||
}
|
||
|
||
// ── Blob ↔ blob (elastic 2D, soft↔hard via the strength dial — §5a). ──
|
||
// O(count²) ≤ ~1k pair tests — trivial. Mass ∝ r² so big blobs shove small ones.
|
||
for (let i = 0; i < count; i++) {
|
||
const a = blobs[i];
|
||
for (let j = i + 1; j < count; j++) {
|
||
const c = blobs[j];
|
||
let dx = c.x - a.x;
|
||
let dy = c.y - a.y;
|
||
let dist = Math.hypot(dx, dy);
|
||
const minDist = a.r + c.r;
|
||
if (dist >= minDist || dist <= 1e-6) continue;
|
||
|
||
const nx = dx / dist, ny = dy / dist; // collision normal a→c
|
||
const overlap = minDist - dist;
|
||
const ma = a.r * a.r, mc = c.r * c.r; // mass ∝ area
|
||
const invSum = 1 / (ma + mc);
|
||
|
||
// Positional separation along the normal, mass-weighted (split the overlap).
|
||
const sep = overlap * (0.3 + 0.7 * collideHardness);
|
||
a.x -= nx * sep * (mc * invSum);
|
||
a.y -= ny * sep * (mc * invSum);
|
||
c.x += nx * sep * (ma * invSum);
|
||
c.y += ny * sep * (ma * invSum);
|
||
|
||
// Soft penalty spring along the normal (gentle shove, low strength).
|
||
const springAcc = BLOB_COLLIDE_SPRING * overlap * (1 - collideHardness * 0.6) * dt;
|
||
a.vx -= nx * springAcc; a.vy -= ny * springAcc;
|
||
c.vx += nx * springAcc; c.vy += ny * springAcc;
|
||
|
||
// Elastic impulse along the normal (hard end), with restitution + mass.
|
||
const rvx = c.vx - a.vx, rvy = c.vy - a.vy;
|
||
const velAlongNormal = rvx * nx + rvy * ny;
|
||
if (velAlongNormal < 0) { // approaching
|
||
const e = collideRest * collideHardness;
|
||
const impulse = -(1 + e) * velAlongNormal * invSum;
|
||
a.vx -= impulse * mc * nx; a.vy -= impulse * mc * ny;
|
||
c.vx += impulse * ma * nx; c.vy += impulse * ma * ny;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/** Pack the live blobs into the upload buffer. Returns the live count. */
|
||
function packBlobs(): number {
|
||
const count = liveBlobCount();
|
||
for (let i = 0; i < count; i++) {
|
||
const b = blobs[i];
|
||
const o = i * 4;
|
||
blobUpload[o] = b.x;
|
||
blobUpload[o + 1] = b.y;
|
||
blobUpload[o + 2] = b.r;
|
||
blobUpload[o + 3] = b.temp;
|
||
}
|
||
return count;
|
||
}
|
||
|
||
let rafId: number | null = null;
|
||
let disposed = false;
|
||
const startTimeMs = performance.now();
|
||
// Wall-clock anchor for the physics dt (separate from the playhead decay clock).
|
||
let lastPhysicsMs = performance.now();
|
||
|
||
// FPS diagnostic (verification aid for the smoothness fix — gated on DEBUG). Counts
|
||
// actual rAF callbacks and logs the rate ~once/sec while playing. This distinguishes
|
||
// the two failure modes: a rate near the display refresh (~60) with the playhead
|
||
// interpolated means motion is smooth; a rate near ~10 would mean the loop is gated
|
||
// to the playback pushes instead of free-running. Reset when the loop (re)starts.
|
||
let fpsFrameCount = 0;
|
||
let fpsWindowStartMs = 0;
|
||
|
||
// One-shot diagnostics: log the canvas dimensions + a post-draw gl.getError() the
|
||
// first time we actually draw at a non-degenerate size. A 1×1 (or 300×150 default)
|
||
// backing store here means the canvas had no layout box when the first draw ran —
|
||
// the ResizeObserver will correct it, but the first paint would be degenerate.
|
||
let firstRealDrawLogged = false;
|
||
|
||
// Backing-store size in device pixels, tracked so we only resize the canvas
|
||
// (which clears it) when the CSS box actually changed.
|
||
let cssWidth = 0;
|
||
let cssHeight = 0;
|
||
let dpr = 1;
|
||
|
||
// ── One-time GL pipeline setup. ──────────────────────────────────────────────
|
||
gl.useProgram(program);
|
||
gl.disable(gl.DEPTH_TEST);
|
||
// Pre-multiplied alpha blend: src already carries colour*alpha (see frag shader).
|
||
gl.enable(gl.BLEND);
|
||
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
|
||
// The datum lives in texture unit 0 for the program's lifetime.
|
||
gl.uniform1i(u.datum, 0);
|
||
|
||
// ── ResizeObserver: one-shot redraw when the container changes while idle. ────
|
||
//
|
||
// The ResizeObserver is the SOLE size writer (spec §2e): we never call
|
||
// getBoundingClientRect per frame. While playing, the rAF loop redraws every
|
||
// frame anyway and picks up the new backing-store size set here. While idle, the
|
||
// observer fires only on an actual size change and triggers a single redraw.
|
||
const resizeObserver = new ResizeObserver((entries) => {
|
||
if (disposed) return;
|
||
const entry = entries[0];
|
||
// contentBoxSize is the modern, layout-thrash-free size source. Fall back to
|
||
// contentRect for engines that don't populate it.
|
||
const box = entry.contentBoxSize?.[0];
|
||
const nextCssWidth = box ? box.inlineSize : entry.contentRect.width;
|
||
const nextCssHeight = box ? box.blockSize : entry.contentRect.height;
|
||
applySize(nextCssWidth, nextCssHeight);
|
||
// While idle, draw one still frame reflecting the new size. While playing,
|
||
// the running loop will redraw on its next tick — no action needed.
|
||
if (!playback.isPlaying) redrawOnce();
|
||
});
|
||
resizeObserver.observe(canvas);
|
||
|
||
/**
|
||
* Update the backing store to a CSS size × devicePixelRatio (capped at MAX_DPR)
|
||
* and the GL viewport. Only resizes when something changed — resizing clears the
|
||
* drawing buffer, so we avoid needless churn. This is the only place the canvas
|
||
* size is written (fed by the ResizeObserver, never by a per-frame measure).
|
||
*/
|
||
function applySize(nextCssWidth: number, nextCssHeight: number): void {
|
||
const nextDpr = Math.min(window.devicePixelRatio || 1, MAX_DPR);
|
||
if (nextCssWidth === cssWidth && nextCssHeight === cssHeight && nextDpr === dpr) {
|
||
return;
|
||
}
|
||
cssWidth = nextCssWidth;
|
||
cssHeight = nextCssHeight;
|
||
dpr = nextDpr;
|
||
canvas.width = Math.max(1, Math.round(cssWidth * dpr));
|
||
canvas.height = Math.max(1, Math.round(cssHeight * dpr));
|
||
gl.viewport(0, 0, canvas.width, canvas.height);
|
||
}
|
||
|
||
/**
|
||
* Issue one GL draw with the current uniforms. The fragment shader does all the
|
||
* scroll/zoom/ribbon work; here we just push the per-frame uniforms and draw the
|
||
* full-screen triangle.
|
||
*/
|
||
function draw(): void {
|
||
if (canvas.width <= 0 || canvas.height <= 0) return;
|
||
|
||
gl.clearColor(0, 0, 0, 0);
|
||
gl.clear(gl.COLOR_BUFFER_BIT);
|
||
|
||
gl.useProgram(program);
|
||
gl.bindVertexArray(vao);
|
||
|
||
// Per-frame uniforms. The playhead is the wall-clock-interpolated value, not
|
||
// the raw last-pushed position — that is what makes the scroll advance every
|
||
// animation frame instead of stepping at Blazor's ~10 Hz push cadence.
|
||
gl.uniform2f(u.resolution, canvas.width, canvas.height);
|
||
gl.uniform1f(u.playheadSeconds, renderedPlayhead());
|
||
gl.uniform1f(u.timeSeconds, (performance.now() - startTimeMs) / 1000);
|
||
// Per-change / per-theme / per-datum uniforms (cheap to set every frame; no
|
||
// separate dirty-tracking needed for scalars/vec3s).
|
||
gl.uniform1f(u.visibleSeconds, visibleSeconds);
|
||
gl.uniform3fv(u.colorAccent, theme.accent);
|
||
gl.uniform3fv(u.colorEdge, theme.edge);
|
||
|
||
// Advance the wax-blob physics by the real elapsed time, then upload the blobs.
|
||
// Stepping here (rather than in the loop) means idle one-shot redraws also advance
|
||
// the sim by their actual dt — clamped by PHYSICS_MAX_DT, so a long paused gap just
|
||
// means the lamp barely moves while paused (it animates with playback, spec §E).
|
||
const nowMs = performance.now();
|
||
const physicsDt = Math.max(0, (nowMs - lastPhysicsMs) / 1000);
|
||
lastPhysicsMs = nowMs;
|
||
stepPhysics(physicsDt);
|
||
const liveCount = packBlobs();
|
||
gl.uniform4fv(u.blobs, blobUpload);
|
||
gl.uniform1i(u.blobCount, liveCount);
|
||
|
||
if (datum) {
|
||
gl.uniform1f(u.hasDatum, 1);
|
||
gl.uniform1f(u.durationSeconds, datum.durationSeconds);
|
||
gl.uniform1i(u.datumWidth, datum.texWidth);
|
||
gl.uniform1i(u.datumSampleCount, datum.sampleCount);
|
||
gl.activeTexture(gl.TEXTURE0);
|
||
gl.bindTexture(gl.TEXTURE_2D, datum.texture);
|
||
} else {
|
||
gl.uniform1f(u.hasDatum, 0);
|
||
gl.uniform1f(u.durationSeconds, 1);
|
||
// Keep the divisor safe even though sampleAt early-outs on uHasDatum<0.5.
|
||
gl.uniform1i(u.datumWidth, 1);
|
||
gl.uniform1i(u.datumSampleCount, 1);
|
||
}
|
||
|
||
// One full-screen triangle (3 vertices), positions from gl_VertexID.
|
||
gl.drawArrays(gl.TRIANGLES, 0, 3);
|
||
gl.bindVertexArray(null);
|
||
|
||
// First draw at a real (laid-out) size: report dimensions and any accumulated
|
||
// GL error. We hold this log until cssWidth/cssHeight are populated so the
|
||
// dimensions Daniel sees are the meaningful ones, not a pre-layout 1×1.
|
||
// gl.getError() is a pipeline stall, so we only call it once, never per frame.
|
||
if (!firstRealDrawLogged && cssWidth > 0 && cssHeight > 0) {
|
||
firstRealDrawLogged = true;
|
||
debugLog(
|
||
`first draw — backing store ${canvas.width}x${canvas.height} px (css ${cssWidth}x${cssHeight} @ dpr ${dpr}), hasDatum=${datum ? 1 : 0}`,
|
||
);
|
||
const glErr = gl.getError();
|
||
if (glErr !== gl.NO_ERROR) {
|
||
console.error(`${TAG} gl.getError() after first draw: 0x${glErr.toString(16)} — the draw did not complete cleanly.`);
|
||
}
|
||
}
|
||
}
|
||
|
||
// ── rAF loop lifecycle (spec §E: cool when paused/backgrounded). ─────────────
|
||
//
|
||
// DESIGN: The loop runs ONLY while playing. When paused or stopped, no frames
|
||
// are scheduled — the GPU is idle. The still slice stays correct via one-shot
|
||
// redraws triggered by the handle methods (setZoom/refreshTheme/setDatum) and
|
||
// by the ResizeObserver.
|
||
//
|
||
// Smoothness (spec §2e / §5.4): the scroll must advance every animation frame, not
|
||
// step at Blazor's ~10 Hz playback-push cadence. We achieve that by interpolating
|
||
// the playhead on the wall clock — each frame uploads renderedPlayhead() (= effectivePlayhead()
|
||
// + the decaying jitter-correction offset), which advances the last pushed position by real time
|
||
// elapsed since the push and blends out any accumulated timing error. (The separate uTimeSeconds
|
||
// monotonic clock drives the blob-radius wobble in the shader; the CPU physics uses its own
|
||
// wall-clock dt — neither drives the scroll, which is the playhead alone.)
|
||
|
||
/** Draw one still frame immediately, without scheduling a new rAF. */
|
||
function redrawOnce(): void {
|
||
if (disposed) return;
|
||
draw();
|
||
}
|
||
|
||
/** Start the rAF loop. No-op if already running or disposed (rafId guard). */
|
||
function startLoop(): void {
|
||
if (disposed || rafId !== null) return;
|
||
// Reset the FPS window so the first measured second reflects the run we're
|
||
// starting, not a stale count from a previous play session.
|
||
fpsFrameCount = 0;
|
||
fpsWindowStartMs = performance.now();
|
||
// Re-base the decay clock to now so the first frame's dt is one frame, not the
|
||
// (possibly long) idle gap since the last redrawOnce — otherwise a stale dt
|
||
// would collapse the offset in one step. (Offset is 0 at play-start today, so
|
||
// this is belt-and-braces, but it keeps the decay honest if that ever changes.)
|
||
lastRenderWallClockMs = performance.now();
|
||
// Re-base the physics clock too, so the first frame's dt is one frame, not the idle
|
||
// gap since the last redraw (which would advance the lamp by a clamped jump on resume).
|
||
lastPhysicsMs = performance.now();
|
||
rafId = requestAnimationFrame(frame);
|
||
}
|
||
|
||
/** Stop the rAF loop. Safe to call when already stopped. */
|
||
function stopLoop(): void {
|
||
if (rafId !== null) {
|
||
cancelAnimationFrame(rafId);
|
||
rafId = null;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* The animation loop. Runs only while playing. Each frame draws the scrolling
|
||
* waveform at the wall-clock-interpolated playhead (effectivePlayhead, advancing
|
||
* smoothly between the ~10 Hz pushes), then reschedules itself — unless playback
|
||
* stopped since this frame was queued, in which case it draws one final still
|
||
* frame (already done above) and exits the loop.
|
||
*
|
||
* A backgrounded tab gets rAF throttled by the browser automatically; on top of
|
||
* that the loop does not run at all when paused, so a foregrounded-but-paused
|
||
* mix burns no frames (spec §E / §5.3).
|
||
*/
|
||
function frame(): void {
|
||
if (disposed) {
|
||
rafId = null;
|
||
return;
|
||
}
|
||
draw();
|
||
|
||
// FPS tally: count this callback, and once per elapsed second emit the rate.
|
||
// performance.now() is cheap (no GPU stall, unlike gl.getError); the gated log
|
||
// fires at most once/sec, so this adds no meaningful per-frame cost.
|
||
if (DEBUG) {
|
||
fpsFrameCount++;
|
||
const nowMs = performance.now();
|
||
const windowMs = nowMs - fpsWindowStartMs;
|
||
if (windowMs >= 1000) {
|
||
const fps = (fpsFrameCount * 1000) / windowMs;
|
||
debugLog(`FPS ${fps.toFixed(1)} (${fpsFrameCount} frames in ${windowMs.toFixed(0)}ms) — playhead ${effectivePlayhead().toFixed(2)}s.`);
|
||
// Lava diagnostic: the dials in play + how many blobs are currently buoyant
|
||
// (temp above ambient) and how many are pooled on the floor. Daniel watches
|
||
// this to confirm heat 0 = all-resting and heat-up = rising count climbs.
|
||
const live = liveBlobCount();
|
||
let buoyant = 0;
|
||
let pooled = 0;
|
||
let avgTemp = 0;
|
||
for (let i = 0; i < live; i++) {
|
||
const b = blobs[i];
|
||
avgTemp += b.temp;
|
||
if (b.temp > TEMP_AMBIENT) buoyant++;
|
||
if (b.y > 1 - b.r - 0.04) pooled++;
|
||
}
|
||
debugLog(
|
||
`lava — heat=${lavaHeat.toFixed(2)} gravity=${lavaGravity.toFixed(2)} ` +
|
||
`collision=${collisionStrength.toFixed(2)} density=${blobDensity.toFixed(2)} | ` +
|
||
`blobs=${live} buoyant=${buoyant} pooled=${pooled} avgTemp=${(avgTemp / Math.max(live, 1)).toFixed(2)}.`,
|
||
);
|
||
fpsFrameCount = 0;
|
||
fpsWindowStartMs = nowMs;
|
||
}
|
||
}
|
||
|
||
if (playback.isPlaying) {
|
||
rafId = requestAnimationFrame(frame);
|
||
} else {
|
||
// Playback stopped between queue and now; final still frame drawn above.
|
||
rafId = null;
|
||
}
|
||
}
|
||
|
||
// Read the initial size synchronously (one getBoundingClientRect at setup is
|
||
// fine — it is the ResizeObserver that must not measure per-frame), then draw a
|
||
// still frame so the canvas isn't blank before the first play command.
|
||
{
|
||
const rect = canvas.getBoundingClientRect();
|
||
applySize(rect.width, rect.height);
|
||
redrawOnce();
|
||
}
|
||
|
||
/**
|
||
* Upload the loudness samples as a 2-D R8 texture that respects
|
||
* GL_MAX_TEXTURE_SIZE, returning the Datum (with the grid dimensions the shader
|
||
* needs to map a sample index → texel) or null on empty/invalid input.
|
||
*
|
||
* Why 2-D and not 1×N: the mix datum runs at ~333 samples/s, so any mix over
|
||
* ~49 s produces more samples than GL_MAX_TEXTURE_SIZE (commonly 4096–16384),
|
||
* and `texImage2D(…, width=N, height=1, …)` is rejected outright
|
||
* ("Requested size at this level is unsupported"), leaving the waveform texture
|
||
* uncreated and the ribbon blank. Laying the N samples row-major across a grid
|
||
* of width = min(N, safeWidth) keeps every dimension well within the limit.
|
||
*
|
||
* Filtering: the shader reads with texelFetch and does its own time-axis
|
||
* interpolation (see sampleAt), so NEAREST is correct here — hardware LINEAR on
|
||
* a 2-D grid would bleed across the row-wrap seam. The final row is zero-padded
|
||
* (texture init is zero-filled, then we overwrite the real samples); padding is
|
||
* never read because sampleAt clamps the index to sampleCount-1.
|
||
*/
|
||
function uploadDatum(samplesBase64: string, durationSeconds: number): Datum | null {
|
||
if (durationSeconds <= 0 || !samplesBase64) {
|
||
// Expected before the player reports a duration: the bridge pushes an empty
|
||
// datum until then. Not an error, but worth seeing while diagnosing.
|
||
debugLog(`uploadDatum skipped — durationSeconds=${durationSeconds}, base64 length=${samplesBase64?.length ?? 0}.`);
|
||
return null;
|
||
}
|
||
const samples = decodeSamples(samplesBase64);
|
||
const sampleCount = samples.length;
|
||
if (sampleCount === 0) {
|
||
console.warn(`${TAG} uploadDatum: decoded 0 samples from a non-empty base64 string — datum will not render.`);
|
||
return null;
|
||
}
|
||
|
||
// Width = min(N, a safe power-of-two cap). The power-of-two cap (4096) is well
|
||
// under every real GL_MAX_TEXTURE_SIZE and keeps row arithmetic clean; we
|
||
// still clamp it to the actual max in case a driver reports something smaller.
|
||
const SAFE_WIDTH = 4096;
|
||
const texWidth = Math.min(sampleCount, Math.min(SAFE_WIDTH, maxTextureSize));
|
||
const texHeight = Math.ceil(sampleCount / texWidth);
|
||
debugLog(
|
||
`uploadDatum — ${sampleCount} samples for ${durationSeconds.toFixed(2)}s mix ` +
|
||
`(${(sampleCount / durationSeconds).toFixed(1)} samples/s); ` +
|
||
`datum texture ${texWidth}x${texHeight} for N=${sampleCount} samples, maxTextureSize=${maxTextureSize}.`,
|
||
);
|
||
|
||
// Pad the final partial row with zeros so the full grid uploads in one call.
|
||
const padded = texWidth * texHeight === sampleCount
|
||
? samples
|
||
: (() => {
|
||
const buf = new Uint8Array(texWidth * texHeight);
|
||
buf.set(samples);
|
||
return buf;
|
||
})();
|
||
|
||
const texture = gl.createTexture();
|
||
if (!texture) return null;
|
||
gl.activeTexture(gl.TEXTURE0);
|
||
gl.bindTexture(gl.TEXTURE_2D, texture);
|
||
// R8 rows are 1-byte-per-texel and texWidth is not guaranteed 4-aligned;
|
||
// relax the default 4-byte unpack alignment so rows aren't read with stride
|
||
// padding the source array doesn't have.
|
||
gl.pixelStorei(gl.UNPACK_ALIGNMENT, 1);
|
||
gl.texImage2D(
|
||
gl.TEXTURE_2D, 0, gl.R8,
|
||
texWidth, texHeight, 0,
|
||
gl.RED, gl.UNSIGNED_BYTE, padded,
|
||
);
|
||
// NEAREST: texelFetch ignores the filter anyway, but be honest about it — the
|
||
// shader interpolates manually to avoid the row-wrap seam (see sampleAt).
|
||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
|
||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
|
||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
|
||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
|
||
gl.bindTexture(gl.TEXTURE_2D, null);
|
||
|
||
return { texture, texWidth, texHeight, sampleCount, durationSeconds, samples };
|
||
}
|
||
|
||
return {
|
||
setDatum(samplesBase64: string, durationSeconds: number): void {
|
||
debugLog(`setDatum received — base64 length ${samplesBase64?.length ?? 0}, durationSeconds ${durationSeconds}.`);
|
||
// Free the previous datum's GPU texture before replacing it (no leak
|
||
// across re-pushes / mix changes — spec §5.11).
|
||
if (datum) {
|
||
gl.deleteTexture(datum.texture);
|
||
datum = null;
|
||
}
|
||
datum = uploadDatum(samplesBase64, durationSeconds);
|
||
// New datum changes what is drawn — refresh the still slice immediately
|
||
// when idle. If playing, the running loop picks it up next frame.
|
||
if (!playback.isPlaying) redrawOnce();
|
||
},
|
||
|
||
setPlayback(positionSeconds: number, isPlaying: boolean): void {
|
||
const wasPlaying = playback.isPlaying;
|
||
|
||
// Preserve on-screen continuity across the re-anchor. The rendered playhead
|
||
// right now is effectivePlayhead() (old anchor) + correctionOffset; capture
|
||
// it before we replace the anchor. We read effectivePlayhead() without going
|
||
// through renderedPlayhead() so we don't advance the decay clock here — the
|
||
// decay belongs to the render loop, ticked once per drawn frame.
|
||
const renderedBefore = effectivePlayhead() + correctionOffset;
|
||
|
||
// Anchor the pushed position to wall-clock NOW: the rAF loop interpolates
|
||
// forward from here each frame (effectivePlayhead), so the scroll advances
|
||
// smoothly between these ~10 Hz pushes.
|
||
playback = { positionSeconds, isPlaying, pushWallClockMs: performance.now() };
|
||
|
||
// Fold the re-anchor discontinuity into the correction offset so the rendered
|
||
// playhead doesn't jump: choose offset such that effectivePlayhead() (new
|
||
// anchor) + offset == renderedBefore. The render loop then decays this offset
|
||
// to zero over PLAYHEAD_CORRECTION_TIME_CONSTANT_SECONDS, converging onto the
|
||
// authoritative position. When pushes are regular the gap is ~0, so offset is
|
||
// ~0 and steady-state matches the prior hard-anchor behaviour exactly.
|
||
//
|
||
// Only smooth while continuously playing. On a play/pause edge or while idle
|
||
// we want the exact authoritative position, not a glide from a stale render:
|
||
// a resume should land on the real position, and a paused still frame must be
|
||
// truthful (read-only contract — never show a position the player isn't at).
|
||
if (isPlaying && wasPlaying) {
|
||
correctionOffset = renderedBefore - effectivePlayhead();
|
||
} else {
|
||
correctionOffset = 0;
|
||
}
|
||
|
||
if (isPlaying && !wasPlaying) {
|
||
// Transition paused/stopped → playing: start the rAF loop.
|
||
debugLog(`playback started — position ${positionSeconds.toFixed(2)}s, datum ${datum ? 'present' : 'ABSENT'}; starting rAF loop.`);
|
||
startLoop();
|
||
} else if (!isPlaying && wasPlaying) {
|
||
// Transition playing → paused/stopped: the in-flight frame draws the
|
||
// final still position and exits on its own (frame() checks
|
||
// playback.isPlaying before rescheduling). We do NOT stopLoop() here —
|
||
// that would cancel the in-flight frame before it draws, leaving a
|
||
// stale canvas. Let the frame run out.
|
||
}
|
||
// isPlaying unchanged (position-only update): the running loop (if any)
|
||
// redraws next frame; nothing to do here.
|
||
},
|
||
|
||
setZoom(seconds: number): void {
|
||
// Clamp into the supported span so a stray value can't break the math.
|
||
visibleSeconds = Math.min(MAX_VISIBLE_SECONDS, Math.max(MIN_VISIBLE_SECONDS, seconds));
|
||
// While playing, the running rAF loop uploads uVisibleSeconds next frame; while idle the
|
||
// loop is stopped (spec §E), so a zoom change must force one still frame here or the new
|
||
// span is uploaded only on the next unrelated redraw (theme/datum/resize) — i.e. never.
|
||
const idleRedraw = !playback.isPlaying;
|
||
debugLog(`setZoom — requested ${seconds.toFixed(3)}s, clamped ${visibleSeconds.toFixed(3)}s; idleRedraw=${idleRedraw} (isPlaying=${playback.isPlaying}).`);
|
||
if (idleRedraw) redrawOnce();
|
||
},
|
||
|
||
// ── R2 TEMPORARY control re-wiring (Wave R4 replaces this with the proper six-knob
|
||
// set). The bridge still calls these three setters by their OLD names — the names are
|
||
// a Wave-2 artifact and are NOT worth a bridge/contract change just to rename for one
|
||
// wave. Each routes its [0,1] value to the lava-physics dial it now drives, so Daniel
|
||
// can FEEL heat/gravity/collision in-browser this wave. The on-screen knob captions
|
||
// still read the old labels (BubbleChart/Air/Palette) — R4 redraws the controls UI.
|
||
// setBubblyness ← "Bubblyness" knob → lava GRAVITY
|
||
// setDetach ← "Detach" knob → lava HEAT
|
||
// setColorShiftSpeed← "Color-shift" knob → COLLISION STRENGTH
|
||
// Idle redraw mirrors setZoom so a paused tweak still updates the still frame.
|
||
setBubblyness(value: number): void {
|
||
lavaGravity = Math.min(1, Math.max(0, value)); // R2 TEMP → gravity
|
||
debugLog(`setGravity (via setBubblyness) → ${lavaGravity.toFixed(3)}.`);
|
||
if (!playback.isPlaying) redrawOnce();
|
||
},
|
||
|
||
setDetach(value: number): void {
|
||
lavaHeat = Math.min(1, Math.max(0, value)); // R2 TEMP → heat
|
||
debugLog(`setHeat (via setDetach) → ${lavaHeat.toFixed(3)}.`);
|
||
if (!playback.isPlaying) redrawOnce();
|
||
},
|
||
|
||
setColorShiftSpeed(value: number): void {
|
||
collisionStrength = Math.min(1, Math.max(0, value)); // R2 TEMP → collision hardness
|
||
debugLog(`setCollisionStrength (via setColorShiftSpeed) → ${collisionStrength.toFixed(3)}.`);
|
||
if (!playback.isPlaying) redrawOnce();
|
||
},
|
||
|
||
refreshTheme(): void {
|
||
theme = readTheme();
|
||
if (!playback.isPlaying) redrawOnce();
|
||
},
|
||
|
||
dispose(): void {
|
||
disposed = true;
|
||
stopLoop();
|
||
resizeObserver.disconnect();
|
||
// Release all GL resources so nothing leaks on navigation (spec §5.11).
|
||
if (datum) {
|
||
gl.deleteTexture(datum.texture);
|
||
datum = null;
|
||
}
|
||
if (vao) gl.deleteVertexArray(vao);
|
||
gl.deleteProgram(program);
|
||
},
|
||
};
|
||
}
|