import { GpuFragmentParams, Expr } from '../../gpu/contract';
import { d } from '../../gpu/kit/index';
import { ArgSpec } from '../invoke';
import { PropRef } from '../values';
import { SampleStage } from './blurs';

export declare const chromaticOffsetUV: import('typegpu').TgpuFn<(uv: d.Vec2f, angle: d.F32, strength: d.F32, aspect: d.F32, channelOffset: d.F32) => d.Vec2f>;
/**
 * Chromatic fan: sample the child at three per-channel offset UVs along `angle` (each channel's
 * signed multiplier × `strength`) and recombine R/G/B — alpha from the green tap, so a centred
 * green (offset 0) keeps the silhouette put. Not a uvRemap candidate: three DIFFERENT sample UVs
 * can't fold into one coordinate.
 */
export declare function chromaticFan(opts: {
    strength: ArgSpec;
    angle: ArgSpec;
    red: ArgSpec;
    green: ArgSpec;
    blue: ArgSpec;
}): SampleStage;
/** The prop roles the spectral-lens recipe binds. */
export interface SpectralLensSlots {
    center: PropRef;
    spread: PropRef;
    bias: PropRef;
    angle: PropRef;
    perspective: PropRef;
    count: PropRef;
    dispersion: PropRef;
    dispersionShift: PropRef;
    dispersionColor: PropRef;
    focusCenter: PropRef;
    focusEdges: PropRef;
    swirl: PropRef;
    noise: PropRef;
    noiseFrequency: PropRef;
    noiseOffset: PropRef;
    lensBulge: PropRef;
    lensCircle: PropRef;
    grainMixer: PropRef;
    grainOverlay: PropRef;
}
/**
 * The spectral-lens recipe: split the child into shifting chromatic layers (a runtime-count
 * gather fan) with barrel/pincushion lens warp, optional circular crop, swirl, noise scatter and
 * film grain. Composed from the kit's lens statement parts — lensGeometry → spreadAxis →
 * spectralFan → grainOverlay, all appending to one statement stream (they share locals via the
 * fresh prefix). The fan loop is raw WGSL because per-iteration texture sampling can't fold
 * into the Expr graph; the accumulated result is premultiplied → straight alpha on the way out
 * like every RTT filter.
 */
export declare function spectralLens(slots: SpectralLensSlots): (params: GpuFragmentParams) => Expr;
//# sourceMappingURL=lens.d.ts.map