<!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('webgl', {
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 h3rgb( 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( h3rgb( 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, 'a_data');
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, 'u_res');
webgl.modeUniformLoc = gl.getUniformLocation(webgl.shaderProgram, 'u_mode');
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('resize', 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('click', 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>
更多关于jQuery相关内容感兴趣的读者可查看本站专题：《jQuery常用插件及用法总结》、《jQuery扩展技巧总结》、《jQuery拖拽特效与技巧总结》、《jQuery常见经典特效汇总》、《jQuery动画与特效用法总结》及《jquery选择器用法总结》