// EDGE STRETCH — each pair of opposing edges gamma-warps independently:
// SIDES pulls content toward the left or right edge, ENDS toward top or
// bottom, CURVE shapes how hard the pull bites near the border.
{
    name: "Edge Stretch"
    engine: "screen"
    input0: "test"

    p0: 0.5  p1: 0.5  p2: 0.5
    dials: [
        {name: "SIDES", bind: "p0", default: 0.5},
        {name: "ENDS", bind: "p1", default: 0.5},
        {name: "CURVE", 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 lr = (self.user.x - 0.5) * 1.6
            let tb = (self.user.y - 0.5) * 1.6
            let curve = 0.4 + 1.4 * self.user.z
            let wx = pow(clamp(uv.x, 0.0001, 0.9999), 1.0 + lr * curve * 0.6)
            let wy = pow(clamp(uv.y, 0.0001, 0.9999), 1.0 + tb * curve * 0.6)
            let tex = self.tex0.sample_as_bgra(clamp(vec2(wx, wy), vec2(0.0, 0.0), vec2(1.0, 1.0)))
            return vec4(tex.xyz, 1.0)
        }
    }
}