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              canvas {
	position: absolute;
	top: 0;
	left: 0;
	background-color: #111;
}
            
          
!
            
              var gl = c.getContext( 'webgl', { preserveDrawingBuffer: true } )
	,	w = c.width = window.innerWidth
	,	h = c.height = window.innerHeight
	, webgl = {};

webgl.vertexShaderSource = `
attribute vec3 a_position;
uniform int u_mode;
uniform float u_tick;
uniform vec2 u_resolution;
varying vec3 v_data;

void main(){
	
	vec2 pos = a_position.x * vec2( cos( a_position.y ), sin( a_position.y ) );
	gl_Position = u_mode == 1 ? vec4( vec2( 1, -1 ) * ( pos / u_resolution ) * 2., 0, 1 ) : vec4( vec2( 1, -1 ) * ( a_position.xy / u_resolution ) * 2., 0, 1 );

	v_data = vec3( 0, a_position.z + u_tick, u_mode );
	if( u_mode == 1 )
		v_data.x = a_position.y;
}
`;
webgl.fragmentShaderSource = `
precision mediump float;
varying vec3 v_data;

vec3 h2rgb( float h ){
	return clamp( abs( mod( h * 6. + vec3( 0, 4, 2 ), 6. ) - 3. ) -1., 0., 1. );
}
void main(){
	vec4 color = vec4( 0, 0, 0, mod( v_data.y, 1. ) );
	if( v_data.z == 1. )
		color.rgb = h2rgb( v_data.x / 6.2831853071 + floor( v_data.y ) / 1000. );

	gl_FragColor = 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.attribLocs = {
	position: gl.getAttribLocation( webgl.shaderProgram, 'a_position' )
};
webgl.buffers = {
	position: gl.createBuffer()
};
webgl.uniformLocs = {
	tick: gl.getUniformLocation( webgl.shaderProgram, 'u_tick' ),
	mode: gl.getUniformLocation( webgl.shaderProgram, 'u_mode' ),
	resolution: gl.getUniformLocation( webgl.shaderProgram, 'u_resolution' )
};

gl.enableVertexAttribArray( webgl.attribLocs.position );
gl.bindBuffer( gl.ARRAY_BUFFER, webgl.buffers.position )
gl.vertexAttribPointer( webgl.attribLocs.position, 3, gl.FLOAT, false, 0, 0 );

gl.enable( gl.BLEND );
gl.blendFunc( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA );

gl.viewport( 0, 0, w, h );
gl.uniform2f( webgl.uniformLocs.resolution, w, h );

webgl.data = {
	position: []
};

webgl.draw = function( glType ){
	
	gl.bufferData( gl.ARRAY_BUFFER, new Float32Array( webgl.data.position ), gl.STATIC_DRAW );
	gl.drawArrays( glType, 0, webgl.data.position.length / 3 );
}

webgl.clear = function( z ){
	var a = w/2
		,	A = -a
		, b = h/2
		, B = -b;
	
	webgl.data.position = [
		A, B, z,
		a, B, z,
		A, b, z,
		A, b, z,
		a, b, z,
		a, B, z
	];
	
	gl.uniform1i( webgl.uniformLocs.mode, 0 );
	webgl.draw( gl.TRIANGLES );
	gl.uniform1i( webgl.uniformLocs.mode, 1 );
	webgl.data.position.length = 0;
};

var particles = []
	,	tick = 0
	, opts = {
	baseW: .005,
	addedW: .015
}
function Particle( radius, radian ){
	this.radius = radius;
	this.radian = radian + 6.2831853071;
	this.w = opts.baseW + opts.addedW * Math.random();
}
Particle.prototype.step = function(){
	
	if( Math.random() < .1 ){
		this.w += ( Math.random() - .5 ) / 100000;
	}
	
	var pr = this.radian;
	
	this.radian += this.w;
	
	webgl.data.position.push(
		this.radius, pr, .99,
		this.radius, this.radian, .99,
		0, this.radian, .01,
		this.radius, this.radian, .04
	);
}

function anim(){
	
	window.requestAnimationFrame( anim );
	
	webgl.clear(.1);
	
	if( particles.length < 1000 ){
		for( var i = 0; i < 4; ++i ){
			particles.push( new Particle( Math.random() * Math.min( w, h ), Math.random() * 6.283185307179586476925286766559 ) );
		}
	}
	
	particles.map( function( particle ){ particle.step() } );
	
	++tick;
	gl.uniform1f( webgl.uniformLocs.tick, tick );
	
	webgl.draw( gl.LINES );
	webgl.data.position.length = 0;
	
}
anim();

window.addEventListener( 'resize', function(){
	w = c.width = window.innerWidth;
	h = c.height = window.innerHeight;
	gl.viewport( 0, 0, w, h );
	gl.uniform2f( webgl.uniformLocs.resolution, w, h );
});

function spawnParticle( e ){
	var dx = e.clientX - w / 2
		,	dy = e.clientY - h / 2;
	
	particles.push( new Particle( Math.sqrt( dx*dx + dy*dy ), Math.atan( dy / dx ) - ( dx < 0 ? Math.PI : 0) ) );
}
var md = false;
window.addEventListener( 'mousedown', function( e ){ md = true; spawnParticle( e ); });
window.addEventListener( 'mousemove', function( e ){ if( md ) spawnParticle( e ); });
window.addEventListener( 'mouseup', function(){ md = false; });

window.addEventListener( 'contextmenu', function( e ){
	e.preventDefault();
	particles.length = 0;
})
            
          
!
999px
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