phaser/src/pixi/filters/CrossHatchFilter.js

A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers.

/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

PIXI.CrossHatchFilter = function()
{
    PIXI.AbstractFilter.call( this );

    this.passes = [this];

    // set the uniforms
    this.uniforms = {
        blur: {type: '1f', value: 1 / 512}
    };

    this.fragmentSrc = [
        'precision mediump float;',
        'varying vec2 vTextureCoord;',
        'varying vec4 vColor;',
        'uniform float blur;',
        'uniform sampler2D uSampler;',

        'void main(void) {',
        '    float lum = length(texture2D(uSampler, vTextureCoord.xy).rgb);',

        '    gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);',

        '    if (lum < 1.00) {',
        '        if (mod(gl_FragCoord.x + gl_FragCoord.y, 10.0) == 0.0) {',
        '            gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);',
        '        }',
        '    }',

        '    if (lum < 0.75) {',
        '        if (mod(gl_FragCoord.x - gl_FragCoord.y, 10.0) == 0.0) {',
        '            gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);',
        '        }',
        '    }',

        '    if (lum < 0.50) {',
        '        if (mod(gl_FragCoord.x + gl_FragCoord.y - 5.0, 10.0) == 0.0) {',
        '            gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);',
        '        }',
        '    }',

        '    if (lum < 0.3) {',
        '        if (mod(gl_FragCoord.x - gl_FragCoord.y - 5.0, 10.0) == 0.0) {',
        '            gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);',
        '        }',
        '    }',
        '}'
    ];
};

PIXI.CrossHatchFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
PIXI.CrossHatchFilter.prototype.constructor = PIXI.BlurYFilter;

Object.defineProperty(PIXI.CrossHatchFilter.prototype, 'blur', {
    get: function() {
        return this.uniforms.blur.value / (1/7000);
    },
    set: function(value) {
        //this.padding = value;
        this.uniforms.blur.value = (1/7000) * value;
    }
});