// MULTI CROP — the same cropped window sampled again into a tiled grid:
// N copies of one framing, breathing together on the beat.
{
    name: "Multi Crop"
    engine: "screen"
    input0: "test"

    p0: 0.5  p1: 0.5  p2: 0.5
    dials: [
        {name: "WINDOW", bind: "p0", default: 0.5},
        {name: "GRID", bind: "p1", default: 0.5},
        {name: "PULSE", 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 cols = floor(mix(1.0, 6.0, self.user.y) + 0.5)
            let cell = fract(uv * cols)
            let winsz = (0.25 + 0.55 * self.user.x) * (1.0 - self.time_beat.w * 0.12 * (0.2 + 1.6 * self.user.z))
            let lo = vec2(0.5, 0.5) - vec2(winsz, winsz) * 0.5
            let src = lo + cell * winsz
            let tex = self.tex0.sample_as_bgra(clamp(src, vec2(0.0, 0.0), vec2(1.0, 1.0)))
            return vec4(tex.xyz, 1.0)
        }
    }
}