// SHUFFLE H — horizontal strips shuffle sideways at a per-strip speed
// drawn fresh from a hash every beat; a rhythmic slice-and-scramble.
// The speed is quantised on floor(beat), never a running accumulator:
// each strip's speed is fixed for the whole beat and the shift resets
// to zero at the top of the next one.
{
    name: "Shuffle H"
    engine: "screen"
    input0: "test"

    p0: 0.5  p1: 0.5  p2: 0.5
    dials: [
        {name: "COUNT", bind: "p0", default: 0.5},
        {name: "SPEED", bind: "p1", default: 0.5},
        {name: "AMOUNT", bind: "p2", default: 0.5}
    ]

    stages: [
        {kind: "bloom", threshold: 0.6, strength: 1.05, levels: 2}
    ]

    shader: draw.DrawVjFxScreen {
        fx_color: fn(uv: vec2, content: vec4, cmix: float) -> vec4 {
            let strips = mix(6.0, 24.0, self.user.x)
            let idx = floor(uv.y * strips)
            let beat_id = floor(self.time_beat.y)
            let bphase = fract(self.time_beat.y)
            let h = fract(sin(idx * 12.9898 + beat_id * 3.713 + 5.0) * 43758.5453)
            let speed = (h - 0.5) * 2.0 * (0.3 + 1.4 * self.user.y)
            let shift = speed * bphase
            let w = vec2(fract(uv.x + shift), uv.y)
            let tex = self.tex0.sample_as_bgra(w)
            let base = self.tex0.sample_as_bgra(uv)
            let amount = 0.3 + 0.7 * self.user.z
            let out = base.xyz.mix(tex.xyz, amount)
            return vec4(out, 1.0)
        }
    }
}