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                <canvas id="glcanvas"></canvas>


                body {
  margin: 0;
  padding: 0;
  overflow: hidden; 



* Example: Mixing a Gampad with four video sources
* If all went well, you should be able to fade four videos together with your
* left handle. If you do nothing all videos will be shown, move around each video
* is 'in the corner', so to speak.

var renderer = new GlRenderer();

var video1 = new VideoSource( renderer, { src: ''} )
var video2 = new VideoSource( renderer, { src: ''} )
var video3 = new VideoSource( renderer, { src: ''} )
var video4 = new VideoSource( renderer, { src: ''} )

var chain1 = new Chain( renderer, { sources: [ video1, video2, video3, video4 ] } );
var keyboard1 = new KeyboardController( renderer )
var output = new Output( renderer, chain1 )


// ------------------------------------------------------------

// wasd
// 87 w  65 a 83 s 68 d
keyboard1.addEventListener( 87, function( arr ) { chain1.setChainLink(0, arr[1] ) } )
keyboard1.addEventListener( 65, function( arr ) { chain1.setChainLink(1, arr[1] ) } )
keyboard1.addEventListener( 83, function( arr ) { chain1.setChainLink(2, arr[1] ) } )
keyboard1.addEventListener( 68, function( arr ) { chain1.setChainLink(3, arr[1] ) } )