首頁  >  文章  >  web前端  >  實例詳解jQuery與HTML5實現WebGL高性能煙火綻放動畫效果

實例詳解jQuery與HTML5實現WebGL高性能煙火綻放動畫效果

小云云
小云云原創
2017-12-30 15:27:342531瀏覽

本文主要介紹了jQuery+HTML5實現WebGL高性能煙火綻放動畫效果,可實現煙火升空爆炸的絢麗動畫效果,完成以後非常好看,希望能幫助到大家掌握jQuery和HTML5實現WebGL高性能煙火綻放動畫效果。

運行效果:

完整程式碼如下:


<!DOCTYPE html>
<html class=" -webkit- js flexbox canvas canvastext webgl no-touch geolocation postmessage websqldatabase indexeddb hashchange history draganddrop websockets rgba hsla multiplebgs backgroundsize borderimage borderradius boxshadow textshadow opacity cssanimations csscolumns cssgradients cssreflections csstransforms csstransforms3d csstransitions fontface generatedcontent video audio localstorage sessionstorage webworkers applicationcache svg inlinesvg smil svgclippaths">
<head>
<meta charset="UTF-8">
<meta name="viewport" content=" initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no">
<title>HTML5/WebGL高性能烟花绽放动画</title>
<meta name="description" content="HTML5/WebGL高性能烟花绽放动画">
<meta name="keywords" content="HTML5/WebGL高性能烟花绽放动画">
<style>
canvas {
  position: absolute;
  top: 0;
  left: 0;
  background-color: #111;
}
</style>
</head>
<body>
<script src="jquery-1.11.1.min.js"></script>
<canvas id="c" width="1440" height="304"></canvas><script src="prefixfree.min.js"></script><script src="modernizr.js"></script><script>var gl = c.getContext(&#39;webgl&#39;, {
    preserveDrawingBuffer: true
  }),
  w = c.width = window.innerWidth,
  h = c.height = window.innerHeight
, webgl = {}, opts = {
  projectileAlpha: .8,
  projectileLineWidth: 1.3,
  fireworkAngleSpan: .5,
  baseFireworkVel: 3,
  addedFireworkVel: 3,
  gravity: .03,
  lowVelBoundary: -.2,
  xFriction: .995,
  baseShardVel: 1,
  addedShardVel: .2,
  fireworks: 1000,
  baseShardsParFirework: 10,
  addedShardsParFirework: 10,
  shardFireworkVelMultiplier: .3,
  initHueMultiplier: 1 / 360,
  runHueAdder: .1 / 360
}
webgl.vertexShaderSource = `
uniform int u_mode;
uniform vec2 u_res;
attribute vec4 a_data;
varying vec4 v_color;
vec3 h2rgb( float h ){
 return clamp( abs( mod( h * 6. + vec3( 0, 4, 2 ), 6. ) - 3. ) -1., 0., 1. );
}
void clear(){
 gl_Position = vec4( a_data.xy, 0, 1 );
 v_color = vec4( 0, 0, 0, a_data.w );
}
void draw(){
 gl_Position = vec4( vec2( 1, -1 ) * ( ( a_data.xy / u_res ) * 2. - 1. ), 0, 1 );
 v_color = vec4( h2rgb( a_data.z ), a_data.w );
}
void main(){
 if( u_mode == 0 )
 draw();
 else
 clear();
}
`;
webgl.fragmentShaderSource = `
precision mediump float;
varying vec4 v_color;
void main(){
 gl_FragColor = v_color;
}
`;
webgl.vertexShader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(webgl.vertexShader, webgl.vertexShaderSource);
gl.compileShader(webgl.vertexShader);
webgl.fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(webgl.fragmentShader, webgl.fragmentShaderSource);
gl.compileShader(webgl.fragmentShader);
webgl.shaderProgram = gl.createProgram();
gl.attachShader(webgl.shaderProgram, webgl.vertexShader);
gl.attachShader(webgl.shaderProgram, webgl.fragmentShader);
gl.linkProgram(webgl.shaderProgram);
gl.useProgram(webgl.shaderProgram);
webgl.dataAttribLoc = gl.getAttribLocation(webgl.shaderProgram, &#39;a_data&#39;);
webgl.dataBuffer = gl.createBuffer();
gl.enableVertexAttribArray(webgl.dataAttribLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, webgl.dataBuffer);
gl.vertexAttribPointer(webgl.dataAttribLoc, 4, gl.FLOAT, false, 0, 0);
webgl.resUniformLoc = gl.getUniformLocation(webgl.shaderProgram, &#39;u_res&#39;);
webgl.modeUniformLoc = gl.getUniformLocation(webgl.shaderProgram, &#39;u_mode&#39;);
gl.viewport(0, 0, w, h);
gl.uniform2f(webgl.resUniformLoc, w, h);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl.enable(gl.BLEND);
gl.lineWidth(opts.projectileLineWidth);
webgl.data = [];
webgl.clear = function() {
  gl.uniform1i(webgl.modeUniformLoc, 1);
  var a = .1;
  webgl.data = [-1, -1, 0, a,
    1, -1, 0, a, -1, 1, 0, a, -1, 1, 0, a,
    1, -1, 0, a,
    1, 1, 0, a
  ];
  webgl.draw(gl.TRIANGLES);
  gl.uniform1i(webgl.modeUniformLoc, 0);
  webgl.data.length = 0;
}
webgl.draw = function(glType) {
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(webgl.data), gl.STATIC_DRAW);
  gl.drawArrays(glType, 0, webgl.data.length / 4);
}
var fireworks = [],
  tick = 0,
  sins = [],
  coss = [],
  maxShardsParFirework = opts.baseShardsParFirework + opts.addedShardsParFirework,
  tau = 6.283185307179586476925286766559;
for (var i = 0; i < maxShardsParFirework; ++i) {
  sins[i] = Math.sin(tau * i / maxShardsParFirework);
  coss[i] = Math.cos(tau * i / maxShardsParFirework);
}
function Firework() {
  this.reset();
  this.shards = [];
  for (var i = 0; i < maxShardsParFirework; ++i)
    this.shards.push(new Shard(this));
}
Firework.prototype.reset = function() {
  var angle = -Math.PI / 2 + (Math.random() - .5) * opts.fireworkAngleSpan,
    vel = opts.baseFireworkVel + opts.addedFireworkVel * Math.random();
  this.mode = 0;
  this.vx = vel * Math.cos(angle);
  this.vy = vel * Math.sin(angle);
  this.x = Math.random() * w;
  this.y = h;
  this.hue = tick * opts.initHueMultiplier;
}
Firework.prototype.step = function() {
  if (this.mode === 0) {
    var ph = this.hue,
      px = this.x,
      py = this.y;
    this.hue += opts.runHueAdder;
    this.x += this.vx *= opts.xFriction;
    this.y += this.vy += opts.gravity;
    webgl.data.push(
      px, py, ph, opts.projectileAlpha * .2,
      this.x, this.y, this.hue, opts.projectileAlpha * .2);
    if (this.vy >= opts.lowVelBoundary) {
      this.mode = 1;
      this.shardAmount = opts.baseShardsParFirework + opts.addedShardsParFirework * Math.random() | 0;
      var baseAngle = Math.random() * tau,
        x = Math.cos(baseAngle),
        y = Math.sin(baseAngle),
        sin = sins[this.shardAmount],
        cos = coss[this.shardAmount];
      for (var i = 0; i < this.shardAmount; ++i) {
        var vel = opts.baseShardVel + opts.addedShardVel * Math.random();
        this.shards[i].reset(x * vel, y * vel)
        var X = x;
        x = x * cos - y * sin;
        y = y * cos + X * sin;
      }
    }
  } else if (this.mode === 1) {
    this.ph = this.hue
    this.hue += opts.runHueAdder;
    var allDead = true;
    for (var i = 0; i < this.shardAmount; ++i) {
      var shard = this.shards[i];
      if (!shard.dead) {
        shard.step();
        allDead = false;
      }
    }
    if (allDead)
      this.reset();
  }
}
function Shard(parent) {
  this.parent = parent;
}
Shard.prototype.reset = function(vx, vy) {
  this.x = this.parent.x;
  this.y = this.parent.y;
  this.vx = this.parent.vx * opts.shardFireworkVelMultiplier + vx;
  this.vy = this.parent.vy * opts.shardFireworkVelMultiplier + vy;
  this.starty = this.y;
  this.dead = false;
  this.tick = 1;
}
Shard.prototype.step = function() {
  this.tick += .05;
  var px = this.x,
    py = this.y;
  this.x += this.vx *= opts.xFriction;
  this.y += this.vy += opts.gravity;
  var proportion = 1 - (this.y - this.starty) / (h - this.starty);
  webgl.data.push(
    px, py, this.parent.ph, opts.projectileAlpha / this.tick,
    this.x, this.y, this.parent.hue, opts.projectileAlpha / this.tick);
  if (this.y > h)
    this.dead = true;
}
function anim() {
  window.requestAnimationFrame(anim)
  webgl.clear();
  ++tick;
  if (fireworks.length < opts.fireworks)
    fireworks.push(new Firework);
  fireworks.map(function(firework) {
    firework.step();
  });
  webgl.draw(gl.LINES);
}
anim();
window.addEventListener(&#39;resize&#39;, function() {
  w = c.width = window.innerWidth;
  h = c.height = window.innerHeight;
  gl.viewport(0, 0, w, h);
  gl.uniform2f(webgl.resUniformLoc, w, h);
})
window.addEventListener(&#39;click&#39;, function(e) {
  var firework = new Firework();
  firework.x = e.clientX;
  firework.y = e.clientY;
  firework.vx = 0;
  firework.vy = 0;
  fireworks.push(firework);
});
</script>
</body>
</html>

相關推薦:

實例教學HTML5 Canvas 超酷煙火綻放動畫實作程式碼_html5教學技巧

HTML5和Webkit實作樹葉飄落動畫

#實例詳解基於jQuery實作圖片推拉門動畫效果

#

以上是實例詳解jQuery與HTML5實現WebGL高性能煙火綻放動畫效果的詳細內容。更多資訊請關注PHP中文網其他相關文章!

陳述:
本文內容由網友自願投稿,版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容,請聯絡admin@php.cn