Added <MetaBalls /> animation

src/content/Animations/MetaBalls/MetaBalls.vue

@@ -0,0 +1,267 @@
+<script setup lang="ts">
+import { Camera, Mesh, Program, Renderer, Transform, Triangle, Vec3 } from 'ogl';
+import { onMounted, onUnmounted, shallowRef, watch } from 'vue';
+
+interface MetaBallsProps {
+  color?: string;
+  speed?: number;
+  enableMouseInteraction?: boolean;
+  hoverSmoothness?: number;
+  animationSize?: number;
+  ballCount?: number;
+  clumpFactor?: number;
+  cursorBallSize?: number;
+  cursorBallColor?: string;
+  enableTransparency?: boolean;
+}
+
+type BallParams = {
+  st: number;
+  dtFactor: number;
+  baseScale: number;
+  toggle: number;
+  radius: number;
+};
+
+const props = withDefaults(defineProps<MetaBallsProps>(), {
+  color: '#27FF64',
+  speed: 0.3,
+  enableMouseInteraction: true,
+  hoverSmoothness: 0.05,
+  animationSize: 30,
+  ballCount: 15,
+  clumpFactor: 1,
+  cursorBallSize: 3,
+  cursorBallColor: '#27FF64',
+  enableTransparency: false
+});
+
+function parseHexColor(hex: string): [number, number, number] {
+  const c = hex.replace('#', '');
+  return [parseInt(c.slice(0, 2), 16) / 255, parseInt(c.slice(2, 4), 16) / 255, parseInt(c.slice(4, 6), 16) / 255];
+}
+
+function fract(x: number) {
+  return x - Math.floor(x);
+}
+
+function hash31(p: number): number[] {
+  const r = [p * 0.1031, p * 0.103, p * 0.0973].map(fract);
+  const r_yzx = [r[1], r[2], r[0]];
+  const dotVal = r[0] * (r_yzx[0] + 33.33) + r[1] * (r_yzx[1] + 33.33) + r[2] * (r_yzx[2] + 33.33);
+  return r.map(val => fract(val + dotVal));
+}
+
+function hash33(v: number[]): number[] {
+  const p = [v[0] * 0.1031, v[1] * 0.103, v[2] * 0.0973].map(fract);
+  const dotVal = p[0] * (p[1] + 33.33) + p[1] * (p[2] + 33.33) + p[2] * (p[0] + 33.33);
+  const r = p.map(val => fract(val + dotVal));
+  return r.map((_, i) => fract((r[i % 3] + r[(i + 1) % 3]) * r[(i + 2) % 3]));
+}
+
+const vertex = `#version 300 es
+precision highp float;
+layout(location = 0) in vec2 position;
+void main() {
+  gl_Position = vec4(position, 0.0, 1.0);
+}
+`;
+
+const fragment = `#version 300 es
+precision highp float;
+uniform vec3 iResolution;
+uniform float iTime;
+uniform vec3 iMouse;
+uniform vec3 iColor;
+uniform vec3 iCursorColor;
+uniform float iAnimationSize;
+uniform int iBallCount;
+uniform float iCursorBallSize;
+uniform vec3 iMetaBalls[50];
+uniform float iClumpFactor;
+uniform bool enableTransparency;
+out vec4 outColor;
+
+float getMetaBallValue(vec2 c, float r, vec2 p) {
+  vec2 d = p - c;
+  float dist2 = dot(d, d);
+  return (r * r) / dist2;
+}
+
+void main() {
+  vec2 fc = gl_FragCoord.xy;
+  float scale = iAnimationSize / iResolution.y;
+  vec2 coord = (fc - iResolution.xy * 0.5) * scale;
+  vec2 mouseW = (iMouse.xy - iResolution.xy * 0.5) * scale;
+
+  float m1 = 0.0;
+  for (int i = 0; i < 50; i++) {
+    if (i >= iBallCount) break;
+    m1 += getMetaBallValue(iMetaBalls[i].xy, iMetaBalls[i].z, coord);
+  }
+
+  float m2 = getMetaBallValue(mouseW, iCursorBallSize, coord);
+  float total = m1 + m2;
+
+  float f = smoothstep(-1.0, 1.0, (total - 1.3) / min(1.0, fwidth(total)));
+
+  vec3 cFinal = vec3(0.0);
+  if (total > 0.0) {
+    float alpha1 = m1 / total;
+    float alpha2 = m2 / total;
+    cFinal = iColor * alpha1 + iCursorColor * alpha2;
+  }
+
+  outColor = vec4(cFinal * f, enableTransparency ? f : 1.0);
+}
+`;
+
+const containerRef = shallowRef<HTMLDivElement>();
+let cleanUpAnimation: () => void = () => {};
+
+const setupAnimation = () => {
+  const container = containerRef.value;
+  if (!container) return;
+
+  const dpr = 1;
+  const renderer = new Renderer({ dpr, alpha: true, premultipliedAlpha: false });
+  const gl = renderer.gl;
+  gl.clearColor(0, 0, 0, props.enableTransparency ? 0 : 1);
+  container.appendChild(gl.canvas);
+
+  const camera = new Camera(gl, {
+    left: -1,
+    right: 1,
+    top: 1,
+    bottom: -1,
+    near: 0.1,
+    far: 10
+  });
+  camera.position.z = 1;
+
+  const geometry = new Triangle(gl);
+  const [r1, g1, b1] = parseHexColor(props.color);
+  const [r2, g2, b2] = parseHexColor(props.cursorBallColor);
+
+  const metaBallsUniform: Vec3[] = Array.from({ length: 50 }, () => new Vec3());
+  const program = new Program(gl, {
+    vertex,
+    fragment,
+    uniforms: {
+      iTime: { value: 0 },
+      iResolution: { value: new Vec3() },
+      iMouse: { value: new Vec3() },
+      iColor: { value: new Vec3(r1, g1, b1) },
+      iCursorColor: { value: new Vec3(r2, g2, b2) },
+      iAnimationSize: { value: props.animationSize },
+      iBallCount: { value: props.ballCount },
+      iCursorBallSize: { value: props.cursorBallSize },
+      iMetaBalls: { value: metaBallsUniform },
+      iClumpFactor: { value: props.clumpFactor },
+      enableTransparency: { value: props.enableTransparency }
+    }
+  });
+
+  const mesh = new Mesh(gl, { geometry, program });
+  mesh.setParent(new Transform());
+
+  const effectiveBallCount = Math.min(props.ballCount, 50);
+  const ballParams: BallParams[] = Array.from({ length: effectiveBallCount }, (_, i) => {
+    const h1 = hash31(i + 1);
+    const h2 = hash33(h1);
+    return {
+      st: h1[0] * 2 * Math.PI,
+      dtFactor: 0.1 * Math.PI + h1[1] * (0.3 * Math.PI),
+      baseScale: 5.0 + h1[1] * 5.0,
+      toggle: Math.floor(h2[0] * 2),
+      radius: 0.5 + h2[2] * 1.5
+    };
+  });
+
+  const mouseBallPos = { x: 0, y: 0 };
+  let pointerInside = false,
+    pointerX = 0,
+    pointerY = 0;
+
+  function resize() {
+    if (!container) return;
+    const { clientWidth, clientHeight } = container;
+    renderer.setSize(clientWidth * dpr, clientHeight * dpr);
+    gl.canvas.style.width = `${clientWidth}px`;
+    gl.canvas.style.height = `${clientHeight}px`;
+    program.uniforms.iResolution.value.set(gl.canvas.width, gl.canvas.height, 0);
+  }
+
+  window.addEventListener('resize', resize);
+  resize();
+
+  container.addEventListener('pointermove', e => {
+    if (!props.enableMouseInteraction) return;
+    const rect = container.getBoundingClientRect();
+    pointerX = ((e.clientX - rect.left) / rect.width) * gl.canvas.width;
+    pointerY = (1 - (e.clientY - rect.top) / rect.height) * gl.canvas.height;
+  });
+
+  container.addEventListener('pointerenter', () => (pointerInside = true));
+  container.addEventListener('pointerleave', () => (pointerInside = false));
+
+  const startTime = performance.now();
+  let animationFrameId: number;
+
+  function update(time: number) {
+    animationFrameId = requestAnimationFrame(update);
+    const elapsed = (time - startTime) * 0.001;
+    program.uniforms.iTime.value = elapsed;
+
+    for (let i = 0; i < effectiveBallCount; i++) {
+      const { st, dtFactor, baseScale, toggle, radius } = ballParams[i];
+      const dt = elapsed * props.speed * dtFactor;
+      const angle = st + dt;
+      const x = Math.cos(angle);
+      const y = Math.sin(angle + dt * toggle);
+      metaBallsUniform[i].set(x * baseScale * props.clumpFactor, y * baseScale * props.clumpFactor, radius);
+    }
+
+    const targetX = pointerInside
+      ? pointerX
+      : gl.canvas.width * 0.5 + Math.cos(elapsed * props.speed) * gl.canvas.width * 0.15;
+    const targetY = pointerInside
+      ? pointerY
+      : gl.canvas.height * 0.5 + Math.sin(elapsed * props.speed) * gl.canvas.height * 0.15;
+
+    mouseBallPos.x += (targetX - mouseBallPos.x) * props.hoverSmoothness;
+    mouseBallPos.y += (targetY - mouseBallPos.y) * props.hoverSmoothness;
+    program.uniforms.iMouse.value.set(mouseBallPos.x, mouseBallPos.y, 0);
+
+    renderer.render({ scene: mesh.parent!, camera });
+  }
+
+  animationFrameId = requestAnimationFrame(update);
+
+  cleanUpAnimation = () => {
+    cancelAnimationFrame(animationFrameId);
+    window.removeEventListener('resize', resize);
+    container.removeEventListener('pointermove', () => {});
+    container.removeEventListener('pointerenter', () => {});
+    container.removeEventListener('pointerleave', () => {});
+    if (container.contains(gl.canvas)) container.removeChild(gl.canvas);
+    gl.getExtension('WEBGL_lose_context')?.loseContext();
+  };
+};
+
+onMounted(setupAnimation);
+onUnmounted(() => cleanUpAnimation?.());
+
+watch(
+  () => props,
+  () => {
+    cleanUpAnimation();
+    setupAnimation();
+  },
+  { deep: true }
+);
+</script>
+
+<template>
+  <div ref="containerRef" class="relative w-full h-full" />
+</template>