// PRESSURE MANIFOLD — hard-techno pipes: a dense acid-green lattice that
// GROWS ON THE KICK. The growth front is beat-locked (eight-beat rebuild)
// and `p0` shoves it forward on every pulse, so new lengths of pipe LURCH
// out of the manifold with the drum; the freshly grown stretch burns
// white through heavy bloom. Pattern taught: p0 is the front nudge — the
// binding turns steady growth into growth BURSTS.
{
    name: "Pressure Manifold"
    engine: "pipes"
    seed: 66

    pipes: 10
    bound: 7
    cell: 0.48
    radius: 0.14
    sides: 8
    steps: 1600
    turn_chance: 0.45
    pop: 0.7
    hot: 6.0

    grow: "loop"
    grow_beats: 8
    beat_pulse: 0.8
    p0: "0.06*env(phase)"        // the kick shoves the front forward
    p1: "0.5 + 1.2*pulse"        // hot tail slams with the beat
    p2: 0.6                      // hard specular

    // PERFORMANCE DIALS — the pipes engine's own p-levers; touching
    // FRONT or HEAT holds its beat binding above at a fixed level.
    dials: [
        {name: "FRONT", bind: "p0", default: 0.1},
        {name: "HEAT", bind: "p1", default: 0.5},
        {name: "SHINE", bind: "p2", default: 0.6}
    ]

    color_bg: #x050803
    color_a: #x7dff1e
    color_b: #x1e9840
    color_c: #xf0ffd8

    cam_orbit: 0.22
    cam_fov: 54
    fog: 0.040
    glow: 1.3

    stages: [
        {kind: "bloom", threshold: 0.35, strength: 1.9, levels: 3},
        {kind: "feedback", amount: "0.25 + 0.20*pulse", zoom: 1.006, rotate: 0.002, dim: 0.95}
    ]

    // 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 = birth order 0..1, attr = (pipe, birth, hue, radius).
    // 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.DrawVjFxPipes {
        fx_color: fn(t: float, attr: vec4, normal: vec3, wpos: vec3) -> vec4 {
            let base = self.col_a.mix(self.col_b, attr.z)
            let shade = 0.85 + 0.15 * sin(attr.z * 6.2831853)
            return vec4(base.xyz * shade, 1.0)
        }
    }
}