import { Expr } from '../gpu/contract';
import { PropRef, Scalar } from './values';

/**
 * An asymmetric soft band around a line/curve: a sharp fade-in on one side, a long fade-out
 * on the other. `distance` is the signed distance from the line (negative = below);
 * `below` fades coverage in across `[from, to]`, `above` fades it out across
 * `[from ?? 0, to]`. The band concept under curtains, horizons, beam falloffs, underlines.
 */
export declare function softBand(opts: {
    distance: Expr;
    below: {
        from: Expr | number;
        to: Expr | number;
    };
    above: {
        from?: Expr | number;
        to: Expr | number;
    };
}): Expr;
/**
 * Disc coverage with a soft, gamma-curved edge: a smoothstep band of half-width
 * `softness.width` around `radius`, raised through `softness.curve`. The soft cousin of the
 * kit's crisp `aa.discCoverage` — this one is a LOOK dial (blobs, orbs, glow dots), not an
 * anti-aliasing footprint.
 */
export declare function softDisc(opts: {
    dist: Expr;
    radius: Expr | number;
    softness: {
        width: Expr | number;
        curve: Expr | number;
    };
}): Expr;
/**
 * Crisp fill of a signed-distance field: 1 inside (`distance < 0`), 0 outside, feathered
 * across one `footprint` (a pixel in field units for anti-aliasing; wider for a deliberate
 * soft edge). The concept-level "fill this shape" word for any paint that draws SDFs
 * outside the shape scaffold (bars, blocks, curve envelopes).
 */
export declare function crispFill(opts: {
    distance: Expr;
    footprint: Expr | number;
}): Expr;
/**
 * Crisp stroke of a signed-distance field: a band of `width` centred on the zero contour,
 * feathered across `footprint`. Sugar over {@link crispFill} on `|distance| − width/2` — the
 * "outline this shape / draw this curve" word.
 */
export declare function crispStroke(opts: {
    distance: Expr;
    width: Expr | number;
    footprint: Expr | number;
}): Expr;
/**
 * Aspect-corrected radial falloff: 0 inside `radius`, rising to 1 at `radius + falloff`.
 * `center` binds a position prop (transformPosition-stored). Body: `fields.radialFalloffMask`.
 */
export declare function radialMask(slots: {
    center: PropRef;
    radius: PropRef;
    falloff: PropRef;
}): Scalar;
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