62:I[707087,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"RegistryDependencies"] 63:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 64:T5878,"use client"; import { cn } from "@/lib/utils"; import { useEffect, useRef, useState } from "react"; /** * A configurable WebGL2 orb: a lit sphere with colour marbling inside it. * * Two ideas carry the whole thing. * * The loop is seamless by construction, not by crossfade. Every point walks a * circle in a flow field whose angle advances by exactly one turn per loop, so * the displacement returns to where it started. Neighbouring points begin at * different angles, and that is what reads as swirling — offset the whole * domain by one shared vector instead and you get a pulse. * * Colour is mixed in OkLab. The midpoint between two stops stays clean instead * of going muddy through sRGB, each picked colour reproduces exactly at its own * stop, and the hue ripple is a real rotation in the a/b plane. * * Everything else is lighting on a sphere impostor: the normal is derived per * pixel from the distance to the centre, which is what lets a rim, a highlight * and a shaded side exist at all. A radial gradient has no surface, and that is * the entire difference between this and a coloured circle. * * Contains two public-domain pieces of prior art, marked at their definitions: * the MurmurHash3 finalizer (Austin Appleby) and the OkLab transform matrices * (Björn Ottosson). */ export interface OrbProps { /** * Rim dispersion. Splits the palette lookup per channel toward the edge, the * way a lens fringes. */ aberration?: number; /** Which colour dominates. `0.5` is even; below favours the first stop. */ balance?: number; /** Interior cell size. Small is busy, large is one slow swell. */ blobScale?: number; /** Hue ripple through the palette. */ chroma?: number; className?: string; /** Two to four stops. Two read as a material, four as iridescent. */ colors?: string[]; /** Lightness contrast around the midpoint. */ contrast?: number; /** Seconds for one full, seamless loop. */ duration?: number; /** How far the flow field carries the field over a loop. */ flow?: number; /** A halo cast outside the silhouette. `0` is none. */ glow?: number; /** Film grain. Also hides the banding large soft gradients show. */ grain?: number; /** Internal scatter, offset away from the highlight. Fake subsurface. */ inner?: number; /** Fresnel-driven hue rotation — thin-film sheen. */ iridescence?: number; /** Light direction, x. */ lightX?: number; /** Light direction, y. */ lightY?: number; /** Freeze on the current frame. */ paused?: boolean; /** Bends the noise lookup by the surface normal. */ refraction?: number; /** Fresnel edge brightness. This is what reads as glass. */ rim?: number; /** Blends the palette toward plain diffuse shading. */ shading?: number; /** Rotates the palette. */ shift?: number; /** Rendered size. Numbers are pixels. */ size?: number | string; /** Edge feather. `0` still resolves to about 1.5 device pixels. */ softness?: number; /** Specular highlight strength. */ specular?: number; /** Strength of the second, nested warp — marbling rather than blobs. */ turbulence?: number; /** Silhouette deformation, so the orb is a drop rather than a ball. */ wobble?: number; } /** The editor's own defaults, which are a good orb rather than a neutral one. */ const DEFAULTS = { aberration: 0.8, balance: 0.5, blobScale: 3, chroma: 1, colors: ["#f25aed", "#ffffff"], contrast: 1, duration: 7, flow: 0.6, glow: 0, grain: 0.6, inner: 0.38, iridescence: 0, lightX: -0.6, lightY: -1, refraction: 0.25, rim: 1.3, shading: 0.05, shift: 0.23, softness: 0.005, specular: 0.2, turbulence: 0.4, wobble: 0, } as const; const MAX_STOPS = 4; const MAX_DPR = 2; const RGB_MAX = 255; const SRGB_KNEE = 0.040_45; const TAU = Math.PI * 2; /** Ambient motion gains nothing from 120 Hz. */ const FRAME_CAP_MS = 1000 / 60; const LIGHT_Z = 0.65; const BALANCE_BASE = 5; /** Keeps rendering slightly before the orb scrolls into view. */ const ROOT_MARGIN = "120px"; /* The covering triangle is built from gl_VertexID, so there is no vertex buffer and no attribute state to manage. */ const VERTEX = `#version 300 es void main() { vec2 p = vec2(float((gl_VertexID << 1) & 2), float(gl_VertexID & 2)); gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0); }`; const FRAGMENT = `#version 300 es precision highp float; precision highp int; // the hash needs full 32-bit ints uniform vec2 uRes; uniform float uPhase; uniform vec3 uLab[4]; uniform float uCount; uniform float uScaleN; uniform float uFlow; uniform float uTurb; uniform float uShift; uniform float uBalance; uniform float uChroma; uniform float uContrast; uniform float uRim; uniform float uSpec; uniform float uInner; uniform float uShading; uniform float uRefract; uniform float uIrid; uniform float uAberr; uniform float uGrain; uniform float uSoft; uniform float uWobble; uniform float uGlow; uniform vec3 uLight; out vec4 fragColor; const float TAU = 6.28318530718; const float RAD = 0.86; // sphere radius in uv units; the rest is glow room const float RMAX = 1.0 / RAD; // radius reached at the nearest canvas edge /* MurmurHash3 finalizer, Austin Appleby, public domain. Exact at any lattice coordinate, so unlike a fract(sin(...)) hash it never bands as the input grows — which matters for the grain, whose input runs into the thousands. */ uint hashU(uint x) { x ^= x >> 16; x *= 0x85EBCA6Bu; x ^= x >> 13; x *= 0xC2B2AE35u; x ^= x >> 16; return x; } uint hashU2(uvec2 p) { return hashU(p.x * 0x9E3779B9u ^ hashU(p.y)); } uint hashU3(uvec3 p) { return hashU(p.x * 0x9E3779B9u ^ hashU(p.y) ^ hashU(p.z) * 0x27D4EB2Fu); } float rand2(ivec2 p) { return float(hashU2(uvec2(p + 4096)) >> 8) / 16777216.0; } float rand3(ivec3 p) { return float(hashU3(uvec3(p + 4096)) >> 8) / 16777216.0; } float vnoise(vec2 p) { ivec2 i = ivec2(floor(p)); vec2 f = fract(p); vec2 u = f * f * (3.0 - 2.0 * f); return mix(mix(rand2(i), rand2(i + ivec2(1, 0)), u.x), mix(rand2(i + ivec2(0, 1)), rand2(i + ivec2(1, 1)), u.x), u.y); } float fbm(vec2 p) { float s = 0.0, a = 0.5; for (int k = 0; k < 3; k++) { s += a * vnoise(p); p *= 2.03; a *= 0.5; } return s / 0.875; } /* Each point walks its own circle, completing exactly one turn per loop. */ vec2 flowField(vec2 p) { float ang = TAU * vnoise(p + 11.3) + uPhase; float mag = 0.35 + 0.65 * vnoise(p + 27.9); return vec2(cos(ang), sin(ang)) * mag; } /* Fresnel-driven hue rotation in the a/b plane — thin-film sheen. */ vec3 iridesce(vec3 lab, float f) { float a = uIrid * f * -2.2; float c = cos(a), s = sin(a); return vec3(lab.x, c * lab.y - s * lab.z, s * lab.y + c * lab.z); } vec3 labRamp(float x) { float xx = clamp(x, 0.0, 1.0) * (uCount - 1.0); vec3 c = mix(uLab[0], uLab[1], clamp(xx, 0.0, 1.0)); c = mix(c, uLab[2], clamp(xx - 1.0, 0.0, 1.0)); c = mix(c, uLab[3], clamp(xx - 2.0, 0.0, 1.0)); return c; } vec3 paletteLab(float t) { float x = pow(clamp(0.5 + 0.5 * cos(TAU * t), 0.0, 1.0), uBalance); vec3 lab = labRamp(x); float ang = TAU * (t * 2.0 + 0.123); lab.yz += 0.17 * uChroma * length(lab.yz) * vec2(sin(ang), cos(ang * 1.37 + 1.1)); /* Cap to roughly the sRGB chroma ceiling. Scaling a/b keeps the hue angle; overshooting and clamping RGB later posterises into flat patches. */ float ch = length(lab.yz); if (ch > 0.33) { lab.yz *= 0.33 / ch; } lab.x = clamp(0.5 + (lab.x - 0.5) * uContrast, 0.0, 1.0); return lab; } /* OkLab transform, Björn Ottosson, public domain. */ vec3 oklabToLinear(vec3 c) { float l_ = c.x + 0.3963377774 * c.y + 0.2158037573 * c.z; float m_ = c.x - 0.1055613458 * c.y - 0.0638541728 * c.z; float s_ = c.x - 0.0894841775 * c.y - 1.2914855480 * c.z; vec3 lms = vec3(l_ * l_ * l_, m_ * m_ * m_, s_ * s_ * s_); return mat3( 4.0767416621, -1.2684380046, -0.0041960863, -3.3077115913, 2.6097574011, -0.7034186147, 0.2309699292, -0.3413193965, 1.7076147010) * lms; } vec3 linearToSrgb(vec3 c) { c = clamp(c, 0.0, 1.0); vec3 lo = c * 12.92; vec3 hi = 1.055 * pow(max(c, 1e-5), vec3(1.0 / 2.4)) - 0.055; return mix(lo, hi, step(0.0031308, c)); } void main() { vec2 uv = (gl_FragCoord.xy * 2.0 - uRes) / min(uRes.x, uRes.y); uv /= RAD; /* Silhouette wobble. Integer harmonics of the angle keep it continuous all the way round; integer multiples of the phase keep it periodic in time. Faded in with radius so the rim deforms like a drop while the core stays put — which also keeps it away from atan()'s singularity at the centre. */ if (uWobble > 0.0) { float r0 = length(uv); float th = atan(uv.y, uv.x + 1e-6); float wob = 0.60 * sin(3.0 * th + uPhase) + 0.40 * sin(5.0 * th - 2.0 * uPhase) + 0.25 * sin(7.0 * th + 3.0 * uPhase); uv *= 1.0 - uWobble * 0.055 * wob * smoothstep(0.0, 0.5, r0); } float r = length(uv); vec2 pd = uv / max(r, 1.0); float z = sqrt(max(1.0 - dot(pd, pd), 0.0)); vec3 n = vec3(pd, z); /* Domain warping. The base fBm is static; all the motion comes from warping its input through the looping flow field, and nesting a second warp is what turns smooth blobs into marbled, ink-in-water flow. */ vec2 p0 = (pd - n.xy * uRefract) * uScaleN; vec2 p1 = p0 + uFlow * flowField(p0); vec2 p2 = p1 + uTurb * flowField(p1 * 1.7 + 5.2); float t = mix(0.5, fbm(p2 + 3.7), 1.35) + uShift; float fres3 = pow(1.0 - n.z, 3.0); vec3 lab = iridesce(paletteLab(t), fres3); vec3 base; if (uAberr > 0.001) { // Dispersion: the palette lookup shifts per channel, strongest at the rim. float d = uAberr * 0.05 * r * r; base = vec3(oklabToLinear(iridesce(paletteLab(t - d), fres3)).r, oklabToLinear(lab).g, oklabToLinear(iridesce(paletteLab(t + d), fres3)).b); } else { base = oklabToLinear(lab); } base = max(base, 0.0); // Lighting is added in linear light, which is where it belongs. vec3 L = normalize(uLight); vec3 col = mix(base, vec3(clamp(dot(n, L), 0.0, 1.0)), uShading); // Internal scatter offset away from the highlight: a translucent body rather // than a lit opaque ball. vec2 op = pd + L.xy * 0.45; col += uInner * exp(-dot(op, op) * 2.2) * base; vec3 half_ = normalize(L + vec3(0.0, 0.0, 1.0)); col += pow(1.0 - n.z, 8.0) * uRim + pow(max(dot(n, half_), 0.0), 24.3) * uSpec; vec3 lit = linearToSrgb(col); vec3 flat_ = linearToSrgb(base); // Never thinner than ~1.5 device px, so the rim stays smooth when the // character is rendered small. float w = max(uSoft, 1.5 * fwidth(r)); float body = 1.0 - smoothstep(1.0 - w, 1.0, r); /* The halo has to reach exactly zero before the canvas boundary. Left alone it is still ~1.5/255 at the edge and gets cut off square, which shows the canvas box as a faint rectangle around the orb. */ float glowF = uGlow * exp(-max(r - 1.0, 0.0) * 20.0); glowF *= 1.0 - smoothstep(0.45, 1.0, (r - 1.0) / (RMAX - 1.0)); float alpha = clamp(body + glowF * (1.0 - body), 0.0, 1.0); vec3 outCol = mix(flat_, lit, body); // Grain plus an always-on deband dither, stepped to 24 frames per loop so it // animates without breaking the seam. int frame = int(uPhase / TAU * 24.0); outCol += (rand3(ivec3(ivec2(gl_FragCoord.xy), frame)) - 0.5) * (uGrain * 0.1 + 1.0 / 255.0); outCol = clamp(outCol, 0.0, 1.0); fragColor = vec4(outCol * alpha, alpha); // premultiplied }`; /** * Any CSS colour to OkLab, in two steps because neither alone is enough. * * `getComputedStyle` resolves `var()` and named colours, but Chrome hands back * `oklch(0.72 0.21 322)` verbatim rather than converting it — read that as three * sRGB channels and a magenta comes out blue. A 1x1 2D canvas rasterises * whatever syntax survives into actual pixels, which is the only step that * cannot lie about the result. */ const cssToOklab = (input: string): [number, number, number] => { const probe = document.createElement("span"); probe.style.color = input; document.body.appendChild(probe); const resolved = getComputedStyle(probe).color; probe.remove(); const surface = document.createElement("canvas"); surface.width = 1; surface.height = 1; const ctx = surface.getContext("2d", { willReadFrequently: true }); if (!ctx) { return [1, 0, 0]; } ctx.fillStyle = resolved; ctx.fillRect(0, 0, 1, 1); const [r8, g8, b8] = ctx.getImageData(0, 0, 1, 1).data; // biome-ignore-start lint/style/useNumericSeparators: published colour-space constants, kept digit-for-digit against the reference const [r, g, b] = [r8, g8, b8].map((channel) => { const u = channel / RGB_MAX; return u <= SRGB_KNEE ? u / 12.92 : ((u + 0.055) / 1.055) ** 2.4; }); const l = Math.cbrt(0.4122214708 * r + 0.5363325363 * g + 0.0514459929 * b); const m = Math.cbrt(0.2119034982 * r + 0.6806995451 * g + 0.1073969566 * b); const s = Math.cbrt(0.0883024619 * r + 0.2817188376 * g + 0.6299787005 * b); return [ 0.2104542553 * l + 0.793617785 * m - 0.0040720468 * s, 1.9779984951 * l - 2.428592205 * m + 0.4505937099 * s, 0.0259040371 * l + 0.7827717662 * m - 0.808675766 * s, ]; // biome-ignore-end lint/style/useNumericSeparators: published colour-space constants }; const compileShader = ( gl: WebGL2RenderingContext, type: number, source: string ) => { const shader = gl.createShader(type); if (!shader) { return null; } gl.shaderSource(shader, source); gl.compileShader(shader); if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) { gl.deleteShader(shader); return null; } return shader; }; export default function Orb({ className, size = 240, ...rest }: OrbProps) { const canvasRef = useRef(null); // The fallback lives here rather than in the caller: a stand-in drawn by // whoever embeds the orb ends up painted over the canvas, which hides the // real thing on every machine that can render it. const [supported, setSupported] = useState(true); // Read inside the loop rather than closed over, so turning a knob pushes a // uniform instead of tearing down and rebuilding the GL context. const syncConfig = useRef<(() => void) | null>(null); const config = useRef({ ...DEFAULTS, ...rest }); config.current = { ...DEFAULTS, ...rest }; useEffect(() => { const canvas = canvasRef.current; if (!canvas) { return; } const gl = canvas.getContext("webgl2", { alpha: true, antialias: false, // a covering triangle has no geometric edges to sample depth: false, powerPreference: "low-power", premultipliedAlpha: true, stencil: false, }); if (!gl) { setSupported(false); return; } const vs = compileShader(gl, gl.VERTEX_SHADER, VERTEX); const fs = compileShader(gl, gl.FRAGMENT_SHADER, FRAGMENT); const program = gl.createProgram(); if (!(vs && fs && program)) { setSupported(false); return; } gl.attachShader(program, vs); gl.attachShader(program, fs); gl.linkProgram(program); gl.deleteShader(vs); gl.deleteShader(fs); if (!gl.getProgramParameter(program, gl.LINK_STATUS)) { setSupported(false); return; } // biome-ignore lint/correctness/useHookAtTopLevel: WebGL2RenderingContext.useProgram is not a React hook. gl.useProgram(program); // Recoverable: a failed first attempt must not disable the orb forever. setSupported(true); gl.disable(gl.DEPTH_TEST); gl.disable(gl.BLEND); // the shader writes premultiplied RGBA straight out const at = (name: string) => gl.getUniformLocation(program, name); const u = { aberr: at("uAberr"), balance: at("uBalance"), chroma: at("uChroma"), contrast: at("uContrast"), count: at("uCount"), flow: at("uFlow"), glow: at("uGlow"), grain: at("uGrain"), inner: at("uInner"), irid: at("uIrid"), lab: at("uLab"), light: at("uLight"), phase: at("uPhase"), refract: at("uRefract"), res: at("uRes"), rim: at("uRim"), scaleN: at("uScaleN"), shading: at("uShading"), shift: at("uShift"), soft: at("uSoft"), spec: at("uSpec"), turb: at("uTurb"), }; const pushConfig = () => { const c = config.current; const stops = c.colors.slice(0, MAX_STOPS); const lab = new Float32Array(MAX_STOPS * 3); for (let i = 0; i < MAX_STOPS; i++) { const [x, y, z] = cssToOklab(stops[Math.min(i, stops.length - 1)]); lab[i * 3] = x; lab[i * 3 + 1] = y; lab[i * 3 + 2] = z; } gl.uniform3fv(u.lab, lab); gl.uniform1f(u.count, Math.max(2, Math.min(stops.length, MAX_STOPS))); // The prop reads as blob size, so invert it into cell frequency. gl.uniform1f(u.scaleN, 1.45 / Math.max(c.blobScale, 0.05)); gl.uniform1f(u.flow, c.flow); gl.uniform1f(u.turb, c.turbulence); gl.uniform1f(u.shift, c.shift); gl.uniform1f(u.balance, BALANCE_BASE ** ((0.5 - c.balance) * 2)); gl.uniform1f(u.chroma, c.chroma); gl.uniform1f(u.contrast, c.contrast); gl.uniform1f(u.rim, c.rim); gl.uniform1f(u.spec, c.specular); gl.uniform1f(u.inner, c.inner); gl.uniform1f(u.shading, c.shading); gl.uniform1f(u.refract, c.refraction); gl.uniform1f(u.irid, c.iridescence); gl.uniform1f(u.aberr, c.aberration); gl.uniform1f(u.grain, c.grain); gl.uniform1f(u.soft, c.softness); gl.uniform1f(at("uWobble"), c.wobble); gl.uniform1f(u.glow, c.glow); gl.uniform3f(u.light, c.lightX, c.lightY, LIGHT_Z); }; const resize = (entry?: ResizeObserverEntry) => { const box = entry?.devicePixelContentBoxSize; let w: number; let h: number; if (box?.length) { w = box[0].inlineSize; h = box[0].blockSize; } else { const dpr = Math.min(window.devicePixelRatio || 1, MAX_DPR); const rect = canvas.getBoundingClientRect(); w = Math.round(rect.width * dpr); h = Math.round(rect.height * dpr); } w = Math.max(1, w); h = Math.max(1, h); if (canvas.width === w && canvas.height === h) { return false; } canvas.width = w; canvas.height = h; gl.viewport(0, 0, w, h); gl.uniform2f(u.res, w, h); return true; }; const draw = () => { gl.clearColor(0, 0, 0, 0); gl.clear(gl.COLOR_BUFFER_BIT); gl.drawArrays(gl.TRIANGLES, 0, 3); }; let phase = 0; let pending = 0; let last = 0; let raf = 0; let running = false; let onScreen = true; const reduce = window.matchMedia("(prefers-reduced-motion: reduce)"); const tick = (now: number) => { raf = requestAnimationFrame(tick); const dt = last ? Math.min(now - last, 100) : FRAME_CAP_MS; last = now; pending += dt; /* Half a frame of slack: without it, a display whose vsync divides the cap almost exactly drops an extra frame and the cadence stutters. */ if (pending < FRAME_CAP_MS - dt * 0.5) { return; } phase = (phase + pending / 1000 / config.current.duration) % 1; pending = 0; gl.uniform1f(u.phase, phase * TAU); draw(); }; const start = () => { if (running || reduce.matches || config.current.paused || !onScreen) { return; } running = true; last = 0; pending = 0; raf = requestAnimationFrame(tick); }; const stop = () => { running = false; if (raf) { cancelAnimationFrame(raf); } raf = 0; }; const applyMotionPreference = () => { if (reduce.matches || config.current.paused) { stop(); if (reduce.matches) { gl.uniform1f(u.phase, 0); } draw(); return; } start(); }; syncConfig.current = () => { pushConfig(); applyMotionPreference(); if (!running) { draw(); } }; pushConfig(); resize(); gl.uniform1f(u.phase, 0); draw(); const observer = new ResizeObserver((entries) => { if (resize(entries[0]) && !running) { draw(); } }); try { observer.observe(canvas, { box: "device-pixel-content-box" }); } catch { observer.observe(canvas); } /* Scrolled out of view is the common case. Nothing is gained by burning GPU on an orb nobody can see. */ const seen = new IntersectionObserver( (entries) => { onScreen = entries.at(-1)?.isIntersecting ?? true; if (onScreen) { start(); } else { stop(); } }, { rootMargin: ROOT_MARGIN } ); seen.observe(canvas); reduce.addEventListener("change", applyMotionPreference); applyMotionPreference(); return () => { syncConfig.current = null; stop(); observer.disconnect(); seen.disconnect(); reduce.removeEventListener("change", applyMotionPreference); gl.deleteProgram(program); /* Deliberately NOT calling WEBGL_lose_context here. React remounts effects in development, and the second pass gets the same canvas back with a context that is still lost — the program then fails to link and the component latches into its fallback for good. Dropping the canvas is enough; the context goes with it. */ }; }, []); // Synchronize committed props even when animation is paused or reduced. // Keep the GPU resources stable; never convert colors on every frame. useEffect(() => { syncConfig.current?.(); }); const dimension = typeof size === "number" ? `${size}px` : size; if (!supported) { const stops = (rest.colors ?? DEFAULTS.colors).slice(0, MAX_STOPS); return (

); } return (