webgl+snap.svg实现花朵绽放漩涡慢动画效果代码-html代码-BFW代码库

webgl+snap.svg实现花朵绽放漩涡慢动画效果代码

代码语言：html

所属分类：动画

代码描述：webgl+snap.svg实现花朵绽放漩涡慢动画效果代码，注意，动画很慢，特使是开始的时候。

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  

  
  
<style>
body,
html {
  overflow: hidden;
}

body {
  height: 100vh;
  width: 100vw;
  background: #0700cc;
  z-index: -2;
  margin: 0;
  width: 100%;
  overflow: hidden;
  position: absolute;
  filter: contrast(0.9) brightness(1.1);
  top: 0;
  left: 0;
  mix-blend-mode: difference;
  animation: filter 10s 5s ease-in 1 forwards;
}

@keyframes filter {
  to {
    filter: contrast(2.5) brightness(1.4);
  }
}
canvas {
  position: absolute;
  left: 0;
  top: 0;
  z-index: -1;
  mix-blend-mode: difference;
}

#glcanvas {
  width: 99.9vw;
  height: 100vh;
  position: absolute;
  left: 0;
  top: 0;
  filter: contrast(1.5);
  z-index: 0;
  mix-blend-mode: hue;
}
</style>


  
</head>

<body translate="no">

  <canvas id="glcanvas"></canvas>
  <script id="vertex-shader" type="x-shader/x-vertex">
    attribute vec2 a_position;
    void main() {
      gl_Position = vec4(a_position, 0.0, 1.0);
    }
  </script>
  <script id="fragment-shader" type="x-shader/x-fragment">
    #ifdef GL_ES
precision mediump float;
#endif

uniform float u_time;
uniform vec2 u_resolution;

float oscillate(float time, float minVal, float maxVal) {
    float sineWave = atan(time);
    float normalizedSine = (sineWave + 1.0) / 2.50;
    return mix(minVal, maxVal, normalizedSine);
}

vec3 palette(float t) {
    vec3 a = vec3(0.323, 0.1, 0.45);
    vec3 b = vec3(0.5, 0.3, 0.12);
    vec3 c = vec3(0.323, 0.9, 0.7);
    vec3 d = vec3(0.6, 0.3, 0.2);
    return a + b * tan(20.28318 * (c * t + d));
}

float removeDiscontinuity(float angle) {
    return smoothstep(angle, 0.0, 0.0);
}



void main() {
    vec2 uv = (gl_FragCoord.xy / u_resolution) * 2.0 - 1.0;
    uv.x *= u_resolution.x / u_resolution.y;
    float time = u_time/1.50;
    
    vec3 finalColor = vec3(0.0);

    float angle = atan(uv.y, uv.x);
    float radius = length(uv);

    float newAngle = removeDiscontinuity(angle);

    float spiral = sin(radius * oscillate(time, 1.0, 10.0) - time * .050 + angle * 15.0);
    spiral += sin(radius/oscillate(time, 0.01, 0.09) - time * 0.001 + angle * 15.0);
    float t = 7.0 + 0.1 * spiral + time * 0.04 + radius * 0.4 + newAngle * 0.01;

    vec3 color = palette(t) * 1.96;
    finalColor += color;
    

    gl_FragColor = vec4(finalColor, 1.0);
}
</script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/snap.svg-0.4.1.js"></script>
      <script>
const canvas = document.getElementById("glcanvas");
const gl = canvas.getContext("webgl");

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

function getShaderSource(id) {
  return document.getElementById(id).textContent;
}

const vertexShaderSource = getShaderSource("vertex-shader");
const fragmentShaderSource = getShaderSource("fragment-shader");

function createShader(gl, type, source) {
  const shader = gl.createShader(type);
  gl.shaderSource(shader, source);
  gl.compileShader(shader);
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    console.error(
    "An error occurred compiling the shaders:",
    gl.getShaderInfoLog(shader));

    gl.deleteShader(shader);
    return null;
  }
  ret.........完整代码请登录后点击上方下载按钮下载查看