Signal Orb

import {  SIGNAL_ORB_STATES,  type SignalOrbState,} from "./types";export const SIGNAL_ORB_CONFIG = {  color: "#45cdb8",  levelDuration: 220,  sampleCount: 16,  size: 160,  transitionDuration: 900,} as const;export const SIGNAL_ORB_STATE_INDEX = Object.fromEntries(  SIGNAL_ORB_STATES.map((state, index) => [state, index]),) as Record<SignalOrbState, number>;

import {  Canvas,  Fill,  Shader,  Skia,  useCanvasSize,  useClock,} from "@shopify/react-native-skia";import { StyleSheet } from "react-native";import {  useDerivedValue,  useReducedMotion,} from "react-native-reanimated";import {  SIGNAL_ORB_CONFIG,  SIGNAL_ORB_STATE_INDEX,} from "./config";import type { SignalOrbBaseProps } from "./types";import { useSignalOrb } from "./use-signal-orb";const signalOrbEffect = (() => {  const effect = Skia.RuntimeEffect.Make(`  uniform float2 resolution;  uniform float time;  uniform float weights[6];  uniform float energy;  uniform float peak;  uniform float variation;  uniform float motion;  uniform float4 tint;  float ring(float distanceToRing, float width, float antialias) {    return 1.0 - smoothstep(      width - antialias,      width + antialias,      abs(distanceToRing)    );  }  float stateWave(    float angle,    float frequency,    float offset,    float phase,    float rotationWeight  ) {    float stationary = sin(angle * frequency + offset);    float rotating = sin(angle * frequency + offset + phase);    return mix(stationary, rotating, rotationWeight);  }  half4 main(float2 position) {    float minimumSize = max(1.0, min(resolution.x, resolution.y));    float2 point = (position - resolution * 0.5) / minimumSize;    float angle = atan(point.y, point.x);    float idle = weights[${SIGNAL_ORB_STATE_INDEX.idle}];    float connecting = weights[${SIGNAL_ORB_STATE_INDEX.connecting}];    float listening = weights[${SIGNAL_ORB_STATE_INDEX.listening}];    float thinking = weights[${SIGNAL_ORB_STATE_INDEX.thinking}];    float speaking = weights[${SIGNAL_ORB_STATE_INDEX.speaking}];    float error = weights[${SIGNAL_ORB_STATE_INDEX.error}];    float phase = time * 2.4 * motion;    float rotationWeight = clamp(      idle + connecting + thinking + error,      0.0,      1.0    );    float audioWeight = listening + speaking;    float audioResponse = energy * audioWeight;    float connectingPulse = connecting *      (0.5 + 0.5 * sin(phase * 2.4));    float listeningBreath = listening * energy *      (0.5 + 0.5 * sin(phase * 1.2));    float speakingEnergy = speaking * (0.35 + energy * 0.65);    float speakingPulseA = speakingEnergy *      (0.5 + 0.5 * sin(phase * 1.6));    float speakingPulseB = speakingEnergy *      (0.5 + 0.5 * sin(phase * 1.6 + 1.9));    float speakingPulseC = speakingEnergy *      (0.5 + 0.5 * sin(phase * 1.6 + 3.8));    float listeningFold = listening * energy *      (0.060 + 0.025 * (0.5 + 0.5 * sin(phase * 1.2))) *      (0.5 + 0.5 * cos(angle * 3.0 + 0.4));    float stateMotion =      idle * 0.005 +      connecting * 0.014 +      listening * 0.012 +      thinking * 0.018 +      speaking * 0.014 +      error * 0.016;    float audioDeformation = energy * (listening * 0.035 + speaking * 0.050) +      variation * audioWeight * 0.025;    float deformation = stateMotion + audioDeformation;    float drift =      idle * 0.003 +      connecting * 0.012 +      listening * 0.008 +      thinking * 0.016 +      speaking * 0.012 +      error * 0.012 +      audioResponse * 0.006;    float ringSpread =      idle * 0.014 +      connecting * (0.018 + connectingPulse * 0.008) +      listening * 0.016 +      thinking * 0.023 +      speaking * 0.019 +      error * 0.018;    float baseRadius = 0.385 + connectingPulse * 0.008 +      listeningBreath * 0.012 + audioResponse *      (listening * 0.018 + speaking * 0.018);    float rotatingDrift = drift * rotationWeight;    float2 pointA = point - float2(cos(phase * 0.82), sin(phase * 0.68)) * rotatingDrift;    float2 pointB = point - float2(cos(phase * 0.61 + 2.1), sin(phase * 0.91 + 1.4)) * rotatingDrift;    float2 pointC = point - float2(cos(phase * 0.74 + 4.0), sin(phase * 0.57 + 3.2)) * rotatingDrift;    float thinkingRipple = thinking * (      sin(angle * 5.0 - phase * 1.4) * 0.018 +      sin(angle * 3.0 + phase * 1.9) * 0.010    );    float errorTension = error * sin(angle * 6.0 + phase * 1.8) * 0.008;    float radiusA = baseRadius - ringSpread +      stateWave(angle, 2.0, 0.0, phase * 1.15, rotationWeight) * deformation +      stateWave(angle, 3.0, 0.0, -phase * 0.72, rotationWeight) * deformation * 0.38 +      thinkingRipple + errorTension +      listeningBreath * 0.006 + speakingPulseA * 0.012 - listeningFold;    float radiusB = baseRadius +      stateWave(angle, 2.0, 2.0, -phase * 0.94, rotationWeight) * deformation * 0.86 +      stateWave(angle, 4.0, 0.0, phase * 0.58, rotationWeight) * deformation * 0.30 -      thinkingRipple * 0.65 +      listeningBreath * 0.006 + speakingPulseB * 0.012 - listeningFold;    float radiusC = baseRadius + ringSpread +      stateWave(angle, 3.0, 4.1, phase * 0.76, rotationWeight) * deformation * 0.72 +      stateWave(angle, 2.0, 0.0, -phase * 0.49, rotationWeight) * deformation * 0.34 -      errorTension * 0.7 +      listeningBreath * 0.006 + speakingPulseC * 0.012 - listeningFold;    float distanceA = length(pointA) - radiusA;    float distanceB = length(pointB) - radiusB;    float distanceC = length(pointC) - radiusC;    float antialias = 1.5 / minimumSize;    float strokeWidth = 0.011 + connectingPulse * 0.003 +      audioResponse * 0.006 + speakingEnergy * 0.006;    float ringA = ring(distanceA, strokeWidth, antialias);    float ringB = ring(distanceB, strokeWidth, antialias);    float ringC = ring(distanceC, strokeWidth, antialias);    float3 colorA = mix(      tint.rgb * 0.88,      float3(0.88, 0.34, 0.30),      error    );    float3 colorB = mix(      min(tint.rgb * 1.08 + float3(0.04), float3(1.0)),      float3(0.96, 0.48, 0.38),      error    );    float3 colorC = mix(colorA, colorB, 0.52);    float coverage = ringA + ringB + ringC;    float3 color = (      colorA * ringA +      colorB * ringB +      colorC * ringC    ) / max(coverage, 0.001);    float halo = (      exp(-abs(distanceA) * 58.0) +      exp(-abs(distanceB) * 58.0) +      exp(-abs(distanceC) * 58.0)    ) * (0.025 + peak * audioWeight * 0.018);    float alpha = clamp(coverage * 0.82 + halo, 0.0, 1.0);    return half4(      color.r * alpha,      color.g * alpha,      color.b * alpha,      alpha    );  }  `);  if (!effect) {    throw new Error("Signal Orb shader failed to compile.");  }  return effect;})();type SignalOrbLayerProps = Pick<  SignalOrbBaseProps,  "color" | "levels" | "state">;export function SignalOrbLayer({  color,  levels,  state,}: SignalOrbLayerProps) {  const {    ref,    size: { height, width },  } = useCanvasSize();  const clock = useClock();  const reducedMotion = useReducedMotion();  const tint = Skia.Color(    color ?? SIGNAL_ORB_CONFIG.color,  );  const { energy, peak, stateWeights, variation } =    useSignalOrb({ levels, state });  const uniforms = useDerivedValue(() => ({    energy: energy.get(),    motion: reducedMotion ? 0 : 1,    peak: peak.get(),    resolution: [width, height],    time: reducedMotion ? 0 : clock.get() / 1_000,    tint,    variation: variation.get(),    weights: stateWeights.get(),  }));  return (    <Canvas      pointerEvents="none"      ref={ref}      style={StyleSheet.absoluteFill}    >      <Fill>        <Shader source={signalOrbEffect} uniforms={uniforms} />      </Fill>    </Canvas>  );}

export const SIGNAL_ORB_STATES = [  "idle",  "connecting",  "listening",  "thinking",  "speaking",  "error",] as const;export type SignalOrbState =  (typeof SIGNAL_ORB_STATES)[number];export type SignalOrbBaseProps = {  /** Accessible description of the assistant and its current state. */  accessibilityLabel?: string;  /** Base color used by every state except the error tint. */  color?: string;  /** Recent normalized audio samples used by listening and speaking states. */  levels?: readonly number[];  /** Height and width of the square drawing surface. */  size?: number;  /** Current assistant state. Changes morph the existing shader continuously. */  state: SignalOrbState;};

import { View } from "react-native";import { SIGNAL_ORB_CONFIG } from "../config";import { SignalOrbLayer } from "../signal-orb-layer";import type { SignalOrbBaseProps } from "../types";import { signalOrbVariants } from "./variants";export type SignalOrbProps = SignalOrbBaseProps & {  className?: string;};/** Minimal shader orb for continuous AI assistant states. */export function SignalOrb({  accessibilityLabel,  className,  color,  levels,  size = SIGNAL_ORB_CONFIG.size,  state,}: SignalOrbProps) {  return (    <View      accessibilityLabel={        accessibilityLabel ?? `AI assistant ${state}`      }      accessibilityRole="image"      accessible      className={signalOrbVariants({ className })}      style={{ height: size, width: size }}    >      <SignalOrbLayer        color={color}        levels={levels}        state={state}      />    </View>  );}

import { useEffect } from "react";import {  Easing,  useSharedValue,  withTiming,} from "react-native-reanimated";import { SIGNAL_ORB_CONFIG } from "./config";import {  SIGNAL_ORB_STATES,  type SignalOrbState,} from "./types";function getStateWeights(state: SignalOrbState) {  return SIGNAL_ORB_STATES.map((item) =>    item === state ? 1 : 0,  );}function getLevelMetrics(levels: readonly number[] | undefined) {  const samples = levels    ?.slice(-SIGNAL_ORB_CONFIG.sampleCount)    .map((level) => Math.min(1, Math.max(0, level))) ?? [];  if (samples.length === 0) {    return { energy: 0, peak: 0, variation: 0 };  }  let squaredTotal = 0;  let peak = 0;  let variationTotal = 0;  for (let index = 0; index < samples.length; index += 1) {    const sample = samples[index];    squaredTotal += sample * sample;    peak = Math.max(peak, sample);    if (index > 0) {      variationTotal += Math.abs(sample - samples[index - 1]);    }  }  return {    energy: Math.sqrt(squaredTotal / samples.length),    peak,    variation:      samples.length > 1        ? variationTotal / (samples.length - 1)        : 0,  };}export function useSignalOrb({  levels,  state,}: {  levels?: readonly number[];  state: SignalOrbState;}) {  const metrics = getLevelMetrics(levels);  const energy = useSharedValue(metrics.energy);  const peak = useSharedValue(metrics.peak);  const stateWeights = useSharedValue(    getStateWeights(state),  );  const variation = useSharedValue(metrics.variation);  useEffect(() => {    stateWeights.set(      withTiming(getStateWeights(state), {        duration: SIGNAL_ORB_CONFIG.transitionDuration,        easing: Easing.inOut(Easing.cubic),      }),    );  }, [state, stateWeights]);  useEffect(() => {    const timing = {      duration: SIGNAL_ORB_CONFIG.levelDuration,      easing: Easing.out(Easing.quad),    };    energy.set(withTiming(metrics.energy, timing));    peak.set(withTiming(metrics.peak, timing));    variation.set(withTiming(metrics.variation, timing));  }, [energy, metrics.energy, metrics.peak, metrics.variation, peak, variation]);  return {    energy,    peak,    stateWeights,    variation,  };}