// MIDNIGHT METROPOLIS — a realistic night city flown over by a slow
// banking camera. The whole city is one static mesh; every lit window is
// pixel math on the facade uv (baked in window units), and each beat a
// fraction of the windows re-roll their state: hash(tower, window,
// floor(beat)) — the city itself flickers in tempo. Rooftop beacons blink
// on tall towers, and the tiltshift stage turns the blocks into a
// miniature. Pattern taught: the city engine's camera is engine-authored
// (a Lissajous drift with view-space banking) — cam_* keys don't steer it,
// `alt`/`fly`/`bank` do.
//
// SCALE: `blocks` is the DEPTH dial. The drift radius, the look-ahead, the
// ground and the sky all scale with the city's half-extent, so raising the
// block count at a FIXED `block` pitch keeps the near field exactly as it
// framed and adds rows RECEDING TO THE HORIZON — 18 blocks is ~1060 towers,
// four times the old nine-block cluster, and the fog is thinned to match so
// the far rows read as a dim glittering skyline instead of being eaten.
{
    name: "Midnight Metropolis"
    engine: "city"
    seed: 12

    style: "night"
    blocks: 18
    block: 6.0
    street: 0.32
    towers: 1100
    max_h: 11.0
    win: 0.30
    density: 0.52
    flicker: 0.14
    alt: 12.5
    fly: 1.1
    bank: 1.2

    beat_pulse: 0.35
    p0: "0.05 + 0.10*energy"    // the city wakes up with the music
    p2: 0.6                      // beacon gain

    // PERFORMANCE DIALS — the city engine's own p-levers: DENS lights
    // extra windows (touching it holds the energy binding), RUSH scrubs
    // the window re-roll front forward, BEACON gains the rooftop blinks.
    dials: [
        {name: "DENS", bind: "p0", default: 0.1},
        {name: "RUSH", bind: "p1", default: 0.0},
        {name: "BEACON", bind: "p2", default: 0.6}
    ]

    color_bg: #x060a18
    color_a: #x36405c
    color_b: #x141a30
    color_c: #xffe6b0

    fog: 0.015
    glow: 1.15

    stages: [
        {kind: "bloom", threshold: 0.55, strength: 1.0, levels: 2},
        {kind: "tiltshift", focus: 0.62, width: 0.30, 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 = 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
        }
    }
}