// BUG EYE — the frame reads through a hex lens array, an insect's compound
// eye: every cell bulges its own patch, JITTER varying the magnification
// per cell off a stable hash.
{
    name: "Bug Eye"
    engine: "screen"
    input0: "test"

    p0: 0.5  p1: 0.5  p2: 0.5
    dials: [
        {name: "SIZE", bind: "p0", default: 0.5},
        {name: "BULGE", bind: "p1", default: 0.5},
        {name: "JITTER", bind: "p2", default: 0.5}
    ]

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

    shader: draw.DrawVjFxScreen {
        hash2: fn(p: vec2) -> float {
            return fract(sin(p.x * 127.1 + p.y * 311.7 + 43.13) * 43758.5453)
        }
        fx_color: fn(uv: vec2, content: vec4, cmix: float) -> vec4 {
            let cell = 0.035 + 0.11 * self.user.x
            let r = vec2(1.0, 1.7320508) * cell
            let h = r * 0.5
            let pa = modf(uv, r) - h
            let pb = modf(uv - h, r) - h
            let da = length(pa)
            let db = length(pb)
            let mut off = pa
            let mut ctr = uv - pa
            if db < da {
                off = pb
                ctr = uv - h - pb
            }
            let hsh = self.hash2(ctr)
            let jitter = clamp(1.0 + self.user.z * (hsh - 0.5) * 1.6, 0.3, 1.8)
            let mag = (1.3 + 2.6 * self.user.y) * jitter * (0.85 + 0.15 * self.time_beat.w)
            let lensoff = off / max(mag, 0.05)
            let w = clamp(ctr + lensoff, vec2(0.0, 0.0), vec2(1.0, 1.0))
            let tex = self.tex0.sample_as_bgra(w)
            let rimt = length(off) / max(length(h), 0.0001)
            let rim = smoothstep(0.82, 1.05, rimt)
            let out = tex.xyz * (1.0 - rim * 0.35)
            return vec4(out, 1.0)
        }
    }
}