Added <Plasma /> Background

src/content/Backgrounds/Plasma/Plasma.vue

@@ -0,0 +1,224 @@
+<script setup lang="ts">
+import { Mesh, Program, Renderer, Triangle } from 'ogl';
+import { onBeforeUnmount, onMounted, ref, useTemplateRef, watch } from 'vue';
+
+interface PlasmaProps {
+  color?: string;
+  speed?: number;
+  direction?: 'forward' | 'reverse' | 'pingpong';
+  scale?: number;
+  opacity?: number;
+  mouseInteractive?: boolean;
+}
+
+const props = withDefaults(defineProps<PlasmaProps>(), {
+  color: '#9EF2BE',
+  speed: 1,
+  direction: 'forward',
+  scale: 1,
+  opacity: 1,
+  mouseInteractive: true
+});
+
+const hexToRgb = (hex: string): [number, number, number] => {
+  const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+  if (!result) return [1, 0.5, 0.2];
+  return [parseInt(result[1], 16) / 255, parseInt(result[2], 16) / 255, parseInt(result[3], 16) / 255];
+};
+
+const vertex = `#version 300 es
+precision highp float;
+in vec2 position;
+in vec2 uv;
+out vec2 vUv;
+void main() {
+  vUv = uv;
+  gl_Position = vec4(position, 0.0, 1.0);
+}
+`;
+
+const fragment = `#version 300 es
+precision highp float;
+uniform vec2 iResolution;
+uniform float iTime;
+uniform vec3 uCustomColor;
+uniform float uUseCustomColor;
+uniform float uSpeed;
+uniform float uDirection;
+uniform float uScale;
+uniform float uOpacity;
+uniform vec2 uMouse;
+uniform float uMouseInteractive;
+out vec4 fragColor;
+
+void mainImage(out vec4 o, vec2 C) {
+  vec2 center = iResolution.xy * 0.5;
+  C = (C - center) / uScale + center;
+  
+  vec2 mouseOffset = (uMouse - center) * 0.0002;
+  C += mouseOffset * length(C - center) * step(0.5, uMouseInteractive);
+  
+  float i, d, z, T = iTime * uSpeed * uDirection;
+  vec3 O, p, S;
+
+  for (vec2 r = iResolution.xy, Q; ++i < 60.; O += o.w/d*o.xyz) {
+    p = z*normalize(vec3(C-.5*r,r.y)); 
+    p.z -= 4.; 
+    S = p;
+    d = p.y-T;
+    
+    p.x += .4*(1.+p.y)*sin(d + p.x*0.1)*cos(.34*d + p.x*0.05); 
+    Q = p.xz *= mat2(cos(p.y+vec4(0,11,33,0)-T)); 
+    z+= d = abs(sqrt(length(Q*Q)) - .25*(5.+S.y))/3.+8e-4; 
+    o = 1.+sin(S.y+p.z*.5+S.z-length(S-p)+vec4(2,1,0,8));
+  }
+  
+  o.xyz = tanh(O/1e4);
+}
+
+bool finite1(float x){ return !(isnan(x) || isinf(x)); }
+vec3 sanitize(vec3 c){
+  return vec3(
+    finite1(c.r) ? c.r : 0.0,
+    finite1(c.g) ? c.g : 0.0,
+    finite1(c.b) ? c.b : 0.0
+  );
+}
+
+void main() {
+  vec4 o = vec4(0.0);
+  mainImage(o, gl_FragCoord.xy);
+  vec3 rgb = sanitize(o.rgb);
+  
+  float intensity = (rgb.r + rgb.g + rgb.b) / 3.0;
+  vec3 customColor = intensity * uCustomColor;
+  vec3 finalColor = mix(rgb, customColor, step(0.5, uUseCustomColor));
+  
+  float alpha = length(rgb) * uOpacity;
+  fragColor = vec4(finalColor, alpha);
+}`;
+
+const containerRef = useTemplateRef('containerRef');
+const mousePos = ref({ x: 0, y: 0 });
+
+let cleanup: (() => void) | null = null;
+
+const setup = () => {
+  if (!containerRef.value) return;
+
+  const useCustomColor = props.color ? 1.0 : 0.0;
+  const customColorRgb = props.color ? hexToRgb(props.color) : [1, 1, 1];
+
+  const directionMultiplier = props.direction === 'reverse' ? -1.0 : 1.0;
+
+  const renderer = new Renderer({
+    webgl: 2,
+    alpha: true,
+    antialias: false,
+    dpr: Math.min(window.devicePixelRatio || 1, 2)
+  });
+  const gl = renderer.gl;
+  const canvas = gl.canvas as HTMLCanvasElement;
+  canvas.style.display = 'block';
+  canvas.style.width = '100%';
+  canvas.style.height = '100%';
+  containerRef.value.appendChild(canvas);
+
+  const geometry = new Triangle(gl);
+
+  const program = new Program(gl, {
+    vertex: vertex,
+    fragment: fragment,
+    uniforms: {
+      iTime: { value: 0 },
+      iResolution: { value: new Float32Array([1, 1]) },
+      uCustomColor: { value: new Float32Array(customColorRgb) },
+      uUseCustomColor: { value: useCustomColor },
+      uSpeed: { value: props.speed * 0.4 },
+      uDirection: { value: directionMultiplier },
+      uScale: { value: props.scale },
+      uOpacity: { value: props.opacity },
+      uMouse: { value: new Float32Array([0, 0]) },
+      uMouseInteractive: { value: props.mouseInteractive ? 1.0 : 0.0 }
+    }
+  });
+
+  const mesh = new Mesh(gl, { geometry, program });
+
+  const handleMouseMove = (e: MouseEvent) => {
+    if (!props.mouseInteractive) return;
+    const rect = containerRef.value!.getBoundingClientRect();
+    mousePos.value.x = e.clientX - rect.left;
+    mousePos.value.y = e.clientY - rect.top;
+    const mouseUniform = program.uniforms.uMouse.value as Float32Array;
+    mouseUniform[0] = mousePos.value.x;
+    mouseUniform[1] = mousePos.value.y;
+  };
+
+  if (props.mouseInteractive) {
+    containerRef.value.addEventListener('mousemove', handleMouseMove);
+  }
+
+  const setSize = () => {
+    const rect = containerRef.value!.getBoundingClientRect();
+    const width = Math.max(1, Math.floor(rect.width));
+    const height = Math.max(1, Math.floor(rect.height));
+    renderer.setSize(width, height);
+    const res = program.uniforms.iResolution.value as Float32Array;
+    res[0] = gl.drawingBufferWidth;
+    res[1] = gl.drawingBufferHeight;
+  };
+
+  const ro = new ResizeObserver(setSize);
+  ro.observe(containerRef.value);
+  setSize();
+
+  let raf = 0;
+  const t0 = performance.now();
+  const loop = (t: number) => {
+    const timeValue = (t - t0) * 0.001;
+
+    if (props.direction === 'pingpong') {
+      const cycle = Math.sin(timeValue * 0.5) * directionMultiplier;
+      (program.uniforms.uDirection as { value: number }).value = cycle;
+    }
+
+    (program.uniforms.iTime as { value: number }).value = timeValue;
+    renderer.render({ scene: mesh });
+    raf = requestAnimationFrame(loop);
+  };
+  raf = requestAnimationFrame(loop);
+
+  cleanup = () => {
+    cancelAnimationFrame(raf);
+    ro.disconnect();
+    if (props.mouseInteractive && containerRef.value) {
+      containerRef.value.removeEventListener('mousemove', handleMouseMove);
+    }
+    try {
+      containerRef.value?.removeChild(canvas);
+    } catch {}
+  };
+};
+
+onMounted(() => {
+  setup();
+});
+
+onBeforeUnmount(() => {
+  cleanup?.();
+});
+
+watch(
+  props,
+  () => {
+    cleanup?.();
+    setup();
+  },
+  { deep: true }
+);
+</script>
+
+<template>
+  <div ref="containerRef" class="relative w-full h-full overflow-hidden" />
+</template>