import { d } from './index';
import { Expr, GpuFragmentParams } from '../contract';

/**
 * Aspect-correct + scale the screen UV to the pattern's sample position. `freq = scale * 4`
 * (the default `freqMul`, which both Stone and Wool use). Pure float — CPU-golden-testable.
 */
export declare const reliefPos: import('typegpu').TgpuFn<(uv: d.Vec2f, aspect: d.F32, scale: d.F32, seed: d.F32) => d.Vec2f>;
/**
 * Warp the child sample UV along the Perlin surface gradient — carved-relief distortion. `perlin12d`
 * returns `vec3(value, dx, dy)`; the `.yz` gradient (scaled by `distortion * 0.012`) shifts the
 * lookup. Hash-based (perlin12d) → GPU-only, no CPU golden.
 */
export declare const reliefDisplacedUV: import('typegpu').TgpuFn<(uv: d.Vec2f, pos: d.Vec2f, distortion: d.F32) => d.Vec2f>;
/**
 * Contrast-remap the [0,1] height around mid-grey, then turn it into a brightness multiplier
 * (`intensity` strength, clamped to [0, 1.6]). Pure float — CPU-golden-testable.
 */
export declare const reliefBrightness: import('typegpu').TgpuFn<(h: d.F32, contrast: d.F32, intensity: d.F32) => d.F32>;
/**
 * The full relief filter. `heightFn` is a `tgpu.fn([d.vec2f], d.f32)` height field (stone12/wool12);
 * `heightHint` seeds its WGSL name. The RTT-filter path:
 *   convertToTexture(child) → sample at the Perlin-distorted UV → unpremultiplyAlpha →
 *   modulate straight rgb by the contrast-remapped height brightness → vec4(rgb*brightness, a).
 * `pos` is emitted into both the distortion and the height call (double-emit — the accepted pattern,
 * numerically identical; `reliefPos` is a cheap deterministic fn).
 */
export declare function applyNoiseReliefExpr(params: GpuFragmentParams, heightFn: unknown, heightHint: string): Expr;
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