FEAT: 🎉 Added <ColorBends /> background

src/content/Backgrounds/ColorBends/ColorBends.vue

@@ -0,0 +1,300 @@
+<script setup lang="ts">
+import * as THREE from 'three';
+import { onMounted, onBeforeUnmount, watch, ref, useTemplateRef, type CSSProperties } from 'vue';
+
+type ColorBendsProps = {
+  className?: string;
+  style?: CSSProperties;
+  rotation?: number;
+  speed?: number;
+  colors?: string[];
+  transparent?: boolean;
+  autoRotate?: number;
+  scale?: number;
+  frequency?: number;
+  warpStrength?: number;
+  mouseInfluence?: number;
+  parallax?: number;
+  noise?: number;
+};
+
+const MAX_COLORS = 8 as const;
+
+const frag = `
+#define MAX_COLORS ${MAX_COLORS}
+uniform vec2 uCanvas;
+uniform float uTime;
+uniform float uSpeed;
+uniform vec2 uRot;
+uniform int uColorCount;
+uniform vec3 uColors[MAX_COLORS];
+uniform int uTransparent;
+uniform float uScale;
+uniform float uFrequency;
+uniform float uWarpStrength;
+uniform vec2 uPointer; // in NDC [-1,1]
+uniform float uMouseInfluence;
+uniform float uParallax;
+uniform float uNoise;
+varying vec2 vUv;
+
+void main() {
+  float t = uTime * uSpeed;
+  vec2 p = vUv * 2.0 - 1.0;
+  p += uPointer * uParallax * 0.1;
+  vec2 rp = vec2(p.x * uRot.x - p.y * uRot.y, p.x * uRot.y + p.y * uRot.x);
+  vec2 q = vec2(rp.x * (uCanvas.x / uCanvas.y), rp.y);
+  q /= max(uScale, 0.0001);
+  q /= 0.5 + 0.2 * dot(q, q);
+  q += 0.2 * cos(t) - 7.56;
+  vec2 toward = (uPointer - rp);
+  q += toward * uMouseInfluence * 0.2;
+
+  vec3 col = vec3(0.0);
+  float a = 1.0;
+
+  if (uColorCount > 0) {
+    vec2 s = q;
+    vec3 sumCol = vec3(0.0);
+    float cover = 0.0;
+    for (int i = 0; i < MAX_COLORS; ++i) {
+      if (i >= uColorCount) break;
+      s -= 0.01;
+      vec2 r = sin(1.5 * (s.yx * uFrequency) + 2.0 * cos(s * uFrequency));
+      float m0 = length(r + sin(5.0 * r.y * uFrequency - 3.0 * t + float(i)) / 4.0);
+      float kBelow = clamp(uWarpStrength, 0.0, 1.0);
+      float kMix = pow(kBelow, 0.3);
+      float gain = 1.0 + max(uWarpStrength - 1.0, 0.0);
+      vec2 disp = (r - s) * kBelow;
+      vec2 warped = s + disp * gain;
+      float m1 = length(warped + sin(5.0 * warped.y * uFrequency - 3.0 * t + float(i)) / 4.0);
+      float m = mix(m0, m1, kMix);
+      float w = 1.0 - exp(-6.0 / exp(6.0 * m));
+      sumCol += uColors[i] * w;
+      cover = max(cover, w);
+    }
+    col = clamp(sumCol, 0.0, 1.0);
+    a = uTransparent > 0 ? cover : 1.0;
+  } else {
+    vec2 s = q;
+    for (int k = 0; k < 3; ++k) {
+      s -= 0.01;
+      vec2 r = sin(1.5 * (s.yx * uFrequency) + 2.0 * cos(s * uFrequency));
+      float m0 = length(r + sin(5.0 * r.y * uFrequency - 3.0 * t + float(k)) / 4.0);
+      float kBelow = clamp(uWarpStrength, 0.0, 1.0);
+      float kMix = pow(kBelow, 0.3);
+      float gain = 1.0 + max(uWarpStrength - 1.0, 0.0);
+      vec2 disp = (r - s) * kBelow;
+      vec2 warped = s + disp * gain;
+      float m1 = length(warped + sin(5.0 * warped.y * uFrequency - 3.0 * t + float(k)) / 4.0);
+      float m = mix(m0, m1, kMix);
+      col[k] = 1.0 - exp(-6.0 / exp(6.0 * m));
+    }
+    a = uTransparent > 0 ? max(max(col.r, col.g), col.b) : 1.0;
+  }
+
+  if (uNoise > 0.0001) {
+    float n = fract(sin(dot(gl_FragCoord.xy + vec2(uTime), vec2(12.9898, 78.233))) * 43758.5453123);
+    col += (n - 0.5) * uNoise;
+    col = clamp(col, 0.0, 1.0);
+  }
+
+  vec3 rgb = (uTransparent > 0) ? col * a : col;
+  gl_FragColor = vec4(rgb, a);
+}
+`;
+
+const vert = `
+varying vec2 vUv;
+void main() {
+  vUv = uv;
+  gl_Position = vec4(position, 1.0);
+}
+`;
+
+const props = withDefaults(defineProps<ColorBendsProps>(), {
+  rotation: 45,
+  speed: 0.2,
+  colors: () => [],
+  transparent: true,
+  autoRotate: 0,
+  scale: 1,
+  frequency: 1,
+  warpStrength: 1,
+  mouseInfluence: 1,
+  parallax: 0.5,
+  noise: 0.1
+});
+
+const containerRef = useTemplateRef('containerRef');
+const rendererRef = ref<THREE.WebGLRenderer | null>(null);
+const rafRef = ref<number | null>(null);
+const materialRef = ref<THREE.ShaderMaterial | null>(null);
+const resizeObserverRef = ref<ResizeObserver | null>(null);
+const rotationRef = ref(props.rotation);
+const autoRotateRef = ref(props.autoRotate);
+const pointerTargetRef = ref(new THREE.Vector2(0, 0));
+const pointerCurrentRef = ref(new THREE.Vector2(0, 0));
+const pointerSmoothRef = ref(8);
+
+let cleanup: (() => void) | null = null;
+
+const setup = () => {
+  const container = containerRef.value!;
+  const scene = new THREE.Scene();
+  const camera = new THREE.OrthographicCamera(-1, 1, 1, -1, 0, 1);
+
+  const geometry = new THREE.PlaneGeometry(2, 2);
+  const uColorsArray = Array.from({ length: MAX_COLORS }, () => new THREE.Vector3(0, 0, 0));
+
+  const material = new THREE.ShaderMaterial({
+    vertexShader: vert,
+    fragmentShader: frag,
+    uniforms: {
+      uCanvas: { value: new THREE.Vector2(1, 1) },
+      uTime: { value: 0 },
+      uSpeed: { value: props.speed },
+      uRot: { value: new THREE.Vector2(1, 0) },
+      uColorCount: { value: 0 },
+      uColors: { value: uColorsArray },
+      uTransparent: { value: props.transparent ? 1 : 0 },
+      uScale: { value: props.scale },
+      uFrequency: { value: props.frequency },
+      uWarpStrength: { value: props.warpStrength },
+      uPointer: { value: new THREE.Vector2(0, 0) },
+      uMouseInfluence: { value: props.mouseInfluence },
+      uParallax: { value: props.parallax },
+      uNoise: { value: props.noise }
+    },
+    premultipliedAlpha: true,
+    transparent: true
+  });
+  materialRef.value = material;
+
+  const mesh = new THREE.Mesh(geometry, material);
+  scene.add(mesh);
+
+  const renderer = new THREE.WebGLRenderer({
+    antialias: false,
+    powerPreference: 'high-performance',
+    alpha: true
+  });
+  rendererRef.value = renderer;
+  (renderer as any).outputColorSpace = (THREE as any).SRGBColorSpace;
+  renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, 2));
+  renderer.setClearColor(0x000000, props.transparent ? 0 : 1);
+  renderer.domElement.style.width = '100%';
+  renderer.domElement.style.height = '100%';
+  renderer.domElement.style.display = 'block';
+  container.appendChild(renderer.domElement);
+
+  const clock = new THREE.Clock();
+
+  const handleResize = () => {
+    const w = container.clientWidth || 1;
+    const h = container.clientHeight || 1;
+    renderer.setSize(w, h, false);
+    (material.uniforms.uCanvas.value as THREE.Vector2).set(w, h);
+  };
+
+  handleResize();
+
+  if ('ResizeObserver' in window) {
+    const ro = new ResizeObserver(handleResize);
+    ro.observe(container);
+    resizeObserverRef.value = ro;
+  } else {
+    (window as any).addEventListener('resize', handleResize);
+  }
+
+  const loop = () => {
+    const dt = clock.getDelta();
+    const elapsed = clock.elapsedTime;
+    material.uniforms.uTime.value = elapsed;
+
+    const deg = (rotationRef.value % 360) + autoRotateRef.value * elapsed;
+    const rad = (deg * Math.PI) / 180;
+    const c = Math.cos(rad);
+    const s = Math.sin(rad);
+    (material.uniforms.uRot.value as THREE.Vector2).set(c, s);
+
+    const cur = pointerCurrentRef.value;
+    const tgt = pointerTargetRef.value;
+    const amt = Math.min(1, dt * pointerSmoothRef.value);
+    cur.lerp(tgt, amt);
+    (material.uniforms.uPointer.value as THREE.Vector2).copy(cur);
+    renderer.render(scene, camera);
+    rafRef.value = requestAnimationFrame(loop);
+  };
+  rafRef.value = requestAnimationFrame(loop);
+
+  const handlePointerMove = (e: PointerEvent) => {
+    const rect = container.getBoundingClientRect();
+    const x = ((e.clientX - rect.left) / rect.width) * 2 - 1;
+    const y = -(((e.clientY - rect.top) / rect.height) * 2 - 1);
+    pointerTargetRef.value.set(x, y);
+  };
+
+  container.addEventListener('pointermove', handlePointerMove);
+
+  cleanup = () => {
+    if (rafRef.value !== null) cancelAnimationFrame(rafRef.value);
+    if (resizeObserverRef.value) resizeObserverRef.value.disconnect();
+    else window.removeEventListener('resize', handleResize);
+    container.removeEventListener('pointermove', handlePointerMove);
+    geometry.dispose();
+    material.dispose();
+    renderer.dispose();
+    if (renderer.domElement && renderer.domElement.parentElement === container) {
+      container.removeChild(renderer.domElement);
+    }
+  };
+};
+
+onMounted(setup);
+onBeforeUnmount(() => cleanup?.());
+
+watch(
+  () => ({ ...props }),
+  () => {
+    const material = materialRef.value;
+    const renderer = rendererRef.value;
+    if (!material) return;
+
+    rotationRef.value = props.rotation;
+    autoRotateRef.value = props.autoRotate;
+    material.uniforms.uSpeed.value = props.speed;
+    material.uniforms.uScale.value = props.scale;
+    material.uniforms.uFrequency.value = props.frequency;
+    material.uniforms.uWarpStrength.value = props.warpStrength;
+    material.uniforms.uMouseInfluence.value = props.mouseInfluence;
+    material.uniforms.uParallax.value = props.parallax;
+    material.uniforms.uNoise.value = props.noise;
+
+    const toVec3 = (hex: string) => {
+      const h = hex.replace('#', '').trim();
+      const v =
+        h.length === 3
+          ? [parseInt(h[0] + h[0], 16), parseInt(h[1] + h[1], 16), parseInt(h[2] + h[2], 16)]
+          : [parseInt(h.slice(0, 2), 16), parseInt(h.slice(2, 4), 16), parseInt(h.slice(4, 6), 16)];
+      return new THREE.Vector3(v[0] / 255, v[1] / 255, v[2] / 255);
+    };
+
+    const arr = (props.colors || []).filter(Boolean).slice(0, MAX_COLORS).map(toVec3);
+    for (let i = 0; i < MAX_COLORS; i++) {
+      const vec = (material.uniforms.uColors.value as THREE.Vector3[])[i];
+      if (i < arr.length) vec.copy(arr[i]);
+      else vec.set(0, 0, 0);
+    }
+    material.uniforms.uColorCount.value = arr.length;
+
+    material.uniforms.uTransparent.value = props.transparent ? 1 : 0;
+    if (renderer) renderer.setClearColor(0x000000, props.transparent ? 0 : 1);
+  },
+  { deep: true }
+);
+</script>
+
+<template>
+  <div ref="containerRef" :class="['w-full h-full relative overflow-hidden', props.className]" :style="props.style" />
+</template>