// SCREENSAVER PIPES — the calm homage: six glossy plastic pipes walking
// the lattice with bulged elbow balls, growing in over twenty-four beats
// and starting over when the front loops (the screensaver clear-screen,
// now beat-locked). Pattern taught: the pipes engine's whole animation IS
// the shared growth front — `grow: "loop"` + `grow_beats` replays the
// birth-ordered build, and every segment pops in with a soft overshoot.
{
    name: "Screensaver Pipes"
    engine: "pipes"
    seed: 41

    pipes: 6
    bound: 6
    cell: 0.55
    radius: 0.17
    sides: 12
    steps: 1000
    turn_chance: 0.34
    pop: 0.45
    hot: 3.0

    grow: "loop"
    grow_beats: 24
    beat_pulse: 0.25
    p1: 0.3                      // gentle hot-tip glow

    // PERFORMANCE DIALS — the pipes engine's own p-levers: FRONT shoves
    // the growth front forward, HEAT gains the fresh-growth burn, SHINE
    // hardens the plastic specular.
    dials: [
        {name: "FRONT", bind: "p0", default: 0.0},
        {name: "HEAT", bind: "p1", default: 0.3},
        {name: "SHINE", bind: "p2", default: 0.0}
    ]

    color_bg: #x0a0e16
    color_a: #x37c8b4
    color_b: #xb45fd8
    color_c: #xf2f6ff

    cam_orbit: 0.10
    cam_fov: 48
    fog: 0.030
    glow: 1.1

    stages: [
        {kind: "bloom", threshold: 0.6, strength: 0.9, 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 = 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)
        }
    }
}