import { GpuShaderDefinition } from '../../gpu/porters';
import { transformColor } from '../../utilities/transformations';
import { ColorStop } from '../../utilities/colorStops';

export type { ColorStop };
export interface ComponentProps {
    /**
     * Color of fresh trails
     *
     * Accepts hex strings (`#ff0000`), RGB objects (`{ r, g, b }`), or CSS color names (`limegreen`).
     * @default "#00aaff"
     */
    colorA: Parameters<typeof transformColor>[0];
    /**
     * Color trails transition to as they fade
     *
     * Accepts hex strings (`#ff0000`), RGB objects (`{ r, g, b }`), or CSS color names (`limegreen`).
     * @default "#ff00aa"
     */
    colorB: Parameters<typeof transformColor>[0];
    stops: ColorStop[] | null;
    /**
     * Base radius of the trail stroke
     *
     * Accepts a number between 0.5 and 2.
     * @default 0.5
     */
    radius: number;
    /**
     * How long the trail persists (in seconds)
     *
     * Accepts a number between 0.1 and 2.
     * @default 0.5
     */
    length: number;
    /**
     * How much the stroke tapers as it fades out (0 = no taper, 1 = full taper)
     *
     * Accepts a number between 0 and 1.
     * @default 1
     */
    shrink: number;
    /**
     * Edge softness of the trail (0 = crisp paint edge, 1 = very soft)
     *
     * @default 0
     */
    softness: number;
    /**
     * Color space for color interpolation
     *
     * Accepts one of the predefined option values.
     * @default "linear"
     */
    colorSpace: string;
}
/** Per-pixel scan of the trail as a SMOOTH CURVE: the stroke-polyline capsule-chain scan
 *  (midpoint quadratic-Bézier spine, min-union SDF, depth-weighted age blend) over this
 *  trail's point budget → vec2(age, coverage). */
export declare const cursorTrailScan: import('typegpu').TgpuFn<(pointsTex: import('typegpu/data').WgslTexture2d<import('typegpu/data').F32>, uv: import('typegpu/data').Vec2f, aspect: import('typegpu/data').F32, radius: import('typegpu/data').F32, shrink: import('typegpu/data').F32, softness: import('typegpu/data').F32, viewportH: import('typegpu/data').F32) => import('typegpu/data').Vec2f>;
export declare const componentDefinition: GpuShaderDefinition<ComponentProps>;
export default componentDefinition;
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