filters/retro plasma

 
var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { create: create, update: update });

var filter;
var sprite;

function create() {

    // Oldskool plasma shader. (c) Victor Korsun, bitekas@gmail.com; 1996-2013.

    var fragmentSrc = [

        "precision mediump float;",

        "uniform float     time;",
        "uniform vec2      resolution;",

        "// Oldskool plasm shader. (c) Victor Korsun, bitekas@gmail.com; 1996-2013.",
        "//",
        "// Attribution-ShareAlike CC License.",

        "//----------------",
        "const int ps = 8; // use values > 1..10 for oldskool",
        "//----------------",

        "void main( void ) {",

            "float x = gl_FragCoord.x / resolution.x * 640.;",
            "float y = gl_FragCoord.y / resolution.y * 480.;",

            "if (ps > 0)",
            "{",
                "x = float(int(x / float(ps)) * ps);",
                "y = float(int(y / float(ps)) * ps);",
            "}",

            "float mov0 = x+y+sin(time)*10.+sin(x/90.)*70.+time*2.;",
            "float mov1 = (mov0 / 5. + sin(mov0 / 30.))/ 10. + time * 3.;",
            "float mov2 = mov1 + sin(mov1)*5. + time*1.0;",
            "float cl1 = sin(sin(mov1/4. + time)+mov1);",
            "float c1 = cl1 +mov2/2.-mov1-mov2+time;",
            "float c2 = sin(c1+sin(mov0/100.+time)+sin(y/57.+time/50.)+sin((x+y)/200.)*2.);",
            "float c3 = abs(sin(c2+cos((mov1+mov2+c2) / 10.)+cos((mov2) / 10.)+sin(x/80.)));",

            "float dc = float(16-ps);",

            "if (ps > 0)",
            "{",
                "cl1 = float(int(cl1*dc))/dc;",
                "c2 = float(int(c2*dc))/dc;",
                "c3 = float(int(c3*dc))/dc;",
            "}",

            "gl_FragColor = vec4( cl1,c2,c3,1.0);",

        "}"
    ];

    sprite = game.add.sprite();
    sprite.width = 800;
    sprite.height = 600;

    filter = new Phaser.Filter(game, null, fragmentSrc);
    filter.setResolution(800, 600);

    sprite.filters = [ filter ];

}

function update() {

    filter.update();

}