Added <Orb /> background

src/content/Backgrounds/Orb/Orb.vue

@@ -0,0 +1,310 @@
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref, watch } from 'vue';
+import { Renderer, Program, Mesh, Triangle, Vec3 } from 'ogl';
+
+interface OrbProps {
+  hue?: number;
+  hoverIntensity?: number;
+  rotateOnHover?: boolean;
+  forceHoverState?: boolean;
+}
+
+const props = withDefaults(defineProps<OrbProps>(), {
+  hue: 0,
+  hoverIntensity: 0.2,
+  rotateOnHover: true,
+  forceHoverState: false
+});
+
+const ctnDom = ref<HTMLDivElement | null>(null);
+
+const vert = /* glsl */ `
+    precision highp float;
+    attribute vec2 position;
+    attribute vec2 uv;
+    varying vec2 vUv;
+    void main() {
+      vUv = uv;
+      gl_Position = vec4(position, 0.0, 1.0);
+    }
+  `;
+
+const frag = /* glsl */ `
+    precision highp float;
+
+    uniform float iTime;
+    uniform vec3 iResolution;
+    uniform float hue;
+    uniform float hover;
+    uniform float rot;
+    uniform float hoverIntensity;
+    varying vec2 vUv;
+
+    vec3 rgb2yiq(vec3 c) {
+      float y = dot(c, vec3(0.299, 0.587, 0.114));
+      float i = dot(c, vec3(0.596, -0.274, -0.322));
+      float q = dot(c, vec3(0.211, -0.523, 0.312));
+      return vec3(y, i, q);
+    }
+    
+    vec3 yiq2rgb(vec3 c) {
+      float r = c.x + 0.956 * c.y + 0.621 * c.z;
+      float g = c.x - 0.272 * c.y - 0.647 * c.z;
+      float b = c.x - 1.106 * c.y + 1.703 * c.z;
+      return vec3(r, g, b);
+    }
+    
+    vec3 adjustHue(vec3 color, float hueDeg) {
+      float hueRad = hueDeg * 3.14159265 / 180.0;
+      vec3 yiq = rgb2yiq(color);
+      float cosA = cos(hueRad);
+      float sinA = sin(hueRad);
+      float i = yiq.y * cosA - yiq.z * sinA;
+      float q = yiq.y * sinA + yiq.z * cosA;
+      yiq.y = i;
+      yiq.z = q;
+      return yiq2rgb(yiq);
+    }
+    
+    vec3 hash33(vec3 p3) {
+      p3 = fract(p3 * vec3(0.1031, 0.11369, 0.13787));
+      p3 += dot(p3, p3.yxz + 19.19);
+      return -1.0 + 2.0 * fract(vec3(
+        p3.x + p3.y,
+        p3.x + p3.z,
+        p3.y + p3.z
+      ) * p3.zyx);
+    }
+    
+    float snoise3(vec3 p) {
+      const float K1 = 0.333333333;
+      const float K2 = 0.166666667;
+      vec3 i = floor(p + (p.x + p.y + p.z) * K1);
+      vec3 d0 = p - (i - (i.x + i.y + i.z) * K2);
+      vec3 e = step(vec3(0.0), d0 - d0.yzx);
+      vec3 i1 = e * (1.0 - e.zxy);
+      vec3 i2 = 1.0 - e.zxy * (1.0 - e);
+      vec3 d1 = d0 - (i1 - K2);
+      vec3 d2 = d0 - (i2 - K1);
+      vec3 d3 = d0 - 0.5;
+      vec4 h = max(0.6 - vec4(
+        dot(d0, d0),
+        dot(d1, d1),
+        dot(d2, d2),
+        dot(d3, d3)
+      ), 0.0);
+      vec4 n = h * h * h * h * vec4(
+        dot(d0, hash33(i)),
+        dot(d1, hash33(i + i1)),
+        dot(d2, hash33(i + i2)),
+        dot(d3, hash33(i + 1.0))
+      );
+      return dot(vec4(31.316), n);
+    }
+    
+    vec4 extractAlpha(vec3 colorIn) {
+      float a = max(max(colorIn.r, colorIn.g), colorIn.b);
+      return vec4(colorIn.rgb / (a + 1e-5), a);
+    }
+    
+    const vec3 baseColor1 = vec3(0.611765, 0.262745, 0.996078);
+    const vec3 baseColor2 = vec3(0.298039, 0.760784, 0.913725);
+    const vec3 baseColor3 = vec3(0.062745, 0.078431, 0.600000);
+    const float innerRadius = 0.6;
+    const float noiseScale = 0.65;
+    
+    float light1(float intensity, float attenuation, float dist) {
+      return intensity / (1.0 + dist * attenuation);
+    }
+    
+    float light2(float intensity, float attenuation, float dist) {
+      return intensity / (1.0 + dist * dist * attenuation);
+    }
+    
+    vec4 draw(vec2 uv) {
+      vec3 color1 = adjustHue(baseColor1, hue);
+      vec3 color2 = adjustHue(baseColor2, hue);
+      vec3 color3 = adjustHue(baseColor3, hue);
+      
+      float ang = atan(uv.y, uv.x);
+      float len = length(uv);
+      float invLen = len > 0.0 ? 1.0 / len : 0.0;
+      
+      float n0 = snoise3(vec3(uv * noiseScale, iTime * 0.5)) * 0.5 + 0.5;
+      float r0 = mix(mix(innerRadius, 1.0, 0.4), mix(innerRadius, 1.0, 0.6), n0);
+      float d0 = distance(uv, (r0 * invLen) * uv);
+      float v0 = light1(1.0, 10.0, d0);
+      v0 *= smoothstep(r0 * 1.05, r0, len);
+      float cl = cos(ang + iTime * 2.0) * 0.5 + 0.5;
+      
+      float a = iTime * -1.0;
+      vec2 pos = vec2(cos(a), sin(a)) * r0;
+      float d = distance(uv, pos);
+      float v1 = light2(1.5, 5.0, d);
+      v1 *= light1(1.0, 50.0, d0);
+      
+      float v2 = smoothstep(1.0, mix(innerRadius, 1.0, n0 * 0.5), len);
+      float v3 = smoothstep(innerRadius, mix(innerRadius, 1.0, 0.5), len);
+      
+      vec3 col = mix(color1, color2, cl);
+      col = mix(color3, col, v0);
+      col = (col + v1) * v2 * v3;
+      col = clamp(col, 0.0, 1.0);
+      
+      return extractAlpha(col);
+    }
+    
+    vec4 mainImage(vec2 fragCoord) {
+      vec2 center = iResolution.xy * 0.5;
+      float size = min(iResolution.x, iResolution.y);
+      vec2 uv = (fragCoord - center) / size * 2.0;
+      
+      float angle = rot;
+      float s = sin(angle);
+      float c = cos(angle);
+      uv = vec2(c * uv.x - s * uv.y, s * uv.x + c * uv.y);
+      
+      uv.x += hover * hoverIntensity * 0.1 * sin(uv.y * 10.0 + iTime);
+      uv.y += hover * hoverIntensity * 0.1 * sin(uv.x * 10.0 + iTime);
+      
+      return draw(uv);
+    }
+    
+    void main() {
+      vec2 fragCoord = vUv * iResolution.xy;
+      vec4 col = mainImage(fragCoord);
+      gl_FragColor = vec4(col.rgb * col.a, col.a);
+    }
+  `;
+
+let cleanupAnimation: (() => void) | null = null;
+
+const setupAnimation = () => {
+  const container = ctnDom.value;
+  if (!container) return;
+
+  const renderer = new Renderer({ alpha: true, premultipliedAlpha: false });
+  const gl = renderer.gl;
+  gl.clearColor(0, 0, 0, 0);
+  container.appendChild(gl.canvas);
+
+  const geometry = new Triangle(gl);
+  const program = new Program(gl, {
+    vertex: vert,
+    fragment: frag,
+    uniforms: {
+      iTime: { value: 0 },
+      iResolution: {
+        value: new Vec3(gl.canvas.width, gl.canvas.height, gl.canvas.width / gl.canvas.height)
+      },
+      hue: { value: props.hue },
+      hover: { value: 0 },
+      rot: { value: 0 },
+      hoverIntensity: { value: props.hoverIntensity }
+    }
+  });
+
+  const mesh = new Mesh(gl, { geometry, program });
+
+  function resize() {
+    if (!container) return;
+    const dpr = window.devicePixelRatio || 1;
+    const width = container.clientWidth;
+    const height = container.clientHeight;
+    renderer.setSize(width * dpr, height * dpr);
+    gl.canvas.style.width = width + 'px';
+    gl.canvas.style.height = height + 'px';
+    program.uniforms.iResolution.value.set(gl.canvas.width, gl.canvas.height, gl.canvas.width / gl.canvas.height);
+  }
+  window.addEventListener('resize', resize);
+  resize();
+
+  let targetHover = 0;
+  let lastTime = 0;
+  let currentRot = 0;
+  const rotationSpeed = 0.3;
+
+  const handleMouseMove = (e: MouseEvent) => {
+    const rect = container.getBoundingClientRect();
+    const x = e.clientX - rect.left;
+    const y = e.clientY - rect.top;
+    const width = rect.width;
+    const height = rect.height;
+    const size = Math.min(width, height);
+    const centerX = width / 2;
+    const centerY = height / 2;
+    const uvX = ((x - centerX) / size) * 2.0;
+    const uvY = ((y - centerY) / size) * 2.0;
+
+    if (Math.sqrt(uvX * uvX + uvY * uvY) < 0.8) {
+      targetHover = 1;
+    } else {
+      targetHover = 0;
+    }
+  };
+
+  const handleMouseLeave = () => {
+    targetHover = 0;
+  };
+
+  container.addEventListener('mousemove', handleMouseMove);
+  container.addEventListener('mouseleave', handleMouseLeave);
+
+  let rafId: number;
+  const update = (t: number) => {
+    rafId = requestAnimationFrame(update);
+    const dt = (t - lastTime) * 0.001;
+    lastTime = t;
+    program.uniforms.iTime.value = t * 0.001;
+    program.uniforms.hue.value = props.hue;
+    program.uniforms.hoverIntensity.value = props.hoverIntensity;
+
+    const effectiveHover = props.forceHoverState ? 1 : targetHover;
+    program.uniforms.hover.value += (effectiveHover - program.uniforms.hover.value) * 0.1;
+
+    if (props.rotateOnHover && effectiveHover > 0.5) {
+      currentRot += dt * rotationSpeed;
+    }
+    program.uniforms.rot.value = currentRot;
+
+    renderer.render({ scene: mesh });
+  };
+  rafId = requestAnimationFrame(update);
+
+  cleanupAnimation = () => {
+    cancelAnimationFrame(rafId);
+    window.removeEventListener('resize', resize);
+    container.removeEventListener('mousemove', handleMouseMove);
+    container.removeEventListener('mouseleave', handleMouseLeave);
+    container.removeChild(gl.canvas);
+    gl.getExtension('WEBGL_lose_context')?.loseContext();
+  };
+};
+
+onMounted(() => {
+  setupAnimation();
+});
+
+onUnmounted(() => {
+  if (cleanupAnimation) {
+    cleanupAnimation();
+    cleanupAnimation = null;
+  }
+});
+
+watch(
+  () => props,
+  () => {
+    if (cleanupAnimation) {
+      cleanupAnimation();
+      cleanupAnimation = null;
+    }
+    setupAnimation();
+  },
+  { deep: true }
+);
+</script>
+
+<template>
+  <div ref="ctnDom" class="w-full h-full" />
+</template>