// MONASTERY SPIRAL — seven hundred ivory dominoes on an Archimedean
// spiral, toppling at exactly four per beat (sixteenths in 4/4), candle
// light flaring at each impact. When the run completes it rests four
// beats, then the whole liturgy RESURRECTS in reverse (the front is a
// triangle wave of the beat — pure shader math). Pattern taught: the
// domino engine's musical clock is `per_beat`; anticipation glow (`p2`)
// makes the pins ahead of the line breathe on the pulse.
{
    name: "Monastery Spiral"
    engine: "domino"
    seed: 47

    layout: "spiral"
    count: 700
    per_beat: 4
    spacing: 0.30
    resurrect: 1
    pause_beats: 4
    flash: 1.0
    jitter: 0.10

    beat_pulse: 0.4
    p2: 0.4                 // soft anticipation ahead of the front

    // PERFORMANCE DIALS — the engine's own p-levers: NUDGE scratches the
    // topple front forward (in beats), FLASH gains the impact light,
    // ANTIC breathes the pins ahead of the line.
    dials: [
        {name: "NUDGE", bind: "p0", default: 0.0},
        {name: "FLASH", bind: "p1", default: 0.0},
        {name: "ANTIC", bind: "p2", default: 0.4}
    ]

    color_bg: #x120a04
    color_a: #xf2e8d0
    color_b: #x8a6a3a
    color_c: #xffd890

    cam_orbit: 0.07
    fog: 0.018
    glow: 1.3

    stages: [
        {kind: "bloom", threshold: 0.5, strength: 1.1, levels: 2},
        {kind: "tiltshift", focus: 0.5, width: 0.35, levels: 2}
    ]

    // THE LOOK LIVES HERE. This block is not a reference to the
    // engine's shader — it IS the pixel math this effect runs.
    // Rewrite it and the effect looks different; everything else
    // (geometry, motion, the content coupling, the beat) keeps
    // working, because the block SUBCLASSES the engine shader.
    // Inputs: t = topple ease 0..1, attr = (branch, arc index, tile hash, yaw).
    // Signals: self.time_beat (time, beat, phase, pulse),
    // self.sig (bar, bpm, energy, dt), self.user (p0..p3),
    // self.col_a/b/c/bg, self.fog (density, glow, content, -).
    shader: draw.DrawVjFxDomino {
        fx_color: fn(t: float, attr: vec4, normal: vec3, wpos: vec3) -> vec4 {
            let mix_t = clamp(attr.x * 0.23 + attr.z * 0.12, 0.0, 1.0)
            return self.col_a.mix(self.col_b, mix_t)
        }
    }
}