// SNARE GARDEN — a branching domino tree: the trunk topples up the middle
// and every branch fires IN STEP the moment the front crosses its
// junction (branch arcs continue the trunk count — parallel toppling is
// pure per-vertex math). Pattern taught: tree layout + a pulse-bound
// impact flash (`p1`) so every landing hits like a snare; branches are
// hue-shifted by their branch id.
{
    name: "Snare Garden"
    engine: "domino"
    seed: 71

    layout: "tree"
    count: 800
    branches: 7
    per_beat: 8
    spacing: 0.28
    resurrect: 1
    pause_beats: 2
    flash: 1.4
    jitter: 0.18

    beat_pulse: 0.7
    p1: "1.2 * pulse"       // impacts flash WITH the beat envelope
    p2: 0.6

    // PERFORMANCE DIALS — the engine's own p-levers; touching FLASH
    // overrides the pulse binding above with a held gain.
    dials: [
        {name: "NUDGE", bind: "p0", default: 0.0},
        {name: "FLASH", bind: "p1", default: 0.5},
        {name: "ANTIC", bind: "p2", default: 0.6}
    ]

    color_bg: #x05070d
    color_a: #x2a3242
    color_b: #x33ff88
    color_c: #xff3366

    cam_orbit: 0.10
    fog: 0.012
    glow: 1.35

    stages: [
        {kind: "bloom", threshold: 0.4, strength: 1.6, levels: 3}
    ]

    // 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)
        }
    }
}