// NEON GRID CITY — the retro synthwave flyover: wireframe-neon towers on
// glowing grid streets under a striped sun. Style "retro" swaps the window
// fills for neon cell edges and paints the sky cylinder with the banded
// sun disc; the street grid runs hot pink and pumps on the pulse. Pattern
// taught: one engine, three looks — `style` reskins the same static mesh
// entirely in the pixel shader, so a doc flip is a full genre change.
{
    name: "Neon Grid City"
    engine: "city"
    seed: 84

    style: "retro"
    blocks: 8
    block: 6.5
    street: 0.36
    towers: 220
    max_h: 9.0
    win: 0.42
    density: 0.30
    flicker: 0.10
    alt: 10.0
    fly: 1.35
    bank: 1.6

    beat_pulse: 0.6
    p1: "0.4 + 0.8*pulse"       // the sun flares on the beat
    p2: 0.5                      // extra edge glow

    // PERFORMANCE DIALS — the city engine's own p-levers: DENS fills
    // neon cells, SUN holds the flare binding when touched, EDGE gains
    // the wire glow.
    dials: [
        {name: "DENS", bind: "p0", default: 0.0},
        {name: "SUN", bind: "p1", default: 0.5},
        {name: "EDGE", bind: "p2", default: 0.5}
    ]

    color_bg: #x16082c
    color_a: #x2cf6ff
    color_b: #xff3fa8
    color_c: #xffd24a

    fog: 0.016
    glow: 1.3

    stages: [
        {kind: "bloom", threshold: 0.42, strength: 1.6, levels: 3},
        {kind: "feedback", amount: 0.30, zoom: 1.004, rotate: 0.0, dim: 0.96}
    ]

    // 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 = height 0..1, attr = (class, id, hash, height/phase).
    // 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.DrawVjFxCity {
        fx_color: fn(t: float, attr: vec4, normal: vec3, wpos: vec3) -> vec4 {
            let v = 0.8 + 0.4 * attr.z
            return self.col_a.mix(self.col_b, clamp(t * 0.8 + attr.z * 0.3, 0.0, 1.0)) * v
        }
    }
}