// COIN FOUNTAIN — the greedy Kick Forge variant: fewer, FAT gold chips
// with high spin and maximum glint, tossed in slower arcs (moderate
// gravity = lower but longer flights) so the payout hangs tumbling and
// strobing. Pattern taught: the glint channel driven hard by `high` —
// hats literally make the money sparkle — and low `falloff` so the whole
// drum pays out, not just the centre.
{
    name: "Coin Fountain"
    engine: "forge"
    seed: 77

    shards: 1200
    radius: 3.6
    impulse: 8.0
    gravity: 34.0
    spin: 2.6
    membrane_wave: 0.35
    shard_size: 0.26
    scatter: 0.8
    falloff: 0.35
    pile: 0.5
    glint: 2.6

    beat_pulse: 0.5
    p0: "0.7 + 2.0*bass"
    p1: "0.2 + 0.8*bass"
    p2: "0.4 + 2.5*high"

    // PERFORMANCE DIALS — the engine's own p-levers; touching one holds
    // its audio binding above at a fixed gain.
    dials: [
        {name: "HEAT", bind: "p0", default: 0.5},
        {name: "RING", bind: "p1", default: 0.5},
        {name: "EMBER", bind: "p2", default: 0.5}
    ]

    color_bg: #x0a0806
    color_a: #xc9a12c      // old gold
    color_b: #xffd86a      // bright gold
    color_c: #xfff7d0      // glint white

    cam_orbit: 0.14
    cam_fov: 54.0
    fog: 0.028
    glow: 1.25

    stages: [
        {kind: "bloom", threshold: 0.5, strength: "1.3 + 1.0*high", levels: 3},
        {kind: "tiltshift", focus: 0.5, width: 0.35, 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 = flight heat 0..1, attr = (id, aux, r0, r1).
    // 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.DrawVjFxForge {
        fx_color: fn(t: float, attr: vec4, normal: vec3, wpos: vec3) -> vec4 {
            let base = self.col_a.mix(self.col_b, fract(attr.w * 7.93))
            let flash = self.col_c * (t * 0.55)
            return vec4(base.xyz + flash.xyz, 1.0)
        }
    }
}