#

API Docs for: 2.0.0
Show: Inherited Protected Private Deprecated

# File: src/pixi/filters/DotScreenFilter.js

    /**
     * @author Mat Groves http://matgroves.com/ @Doormat23
     * original filter: https://github.com/evanw/glfx.js/blob/master/src/filters/fun/dotscreen.js
     */

    /**
     * This filter applies a dotscreen effect making display objects appear to be made out of black and white halftone dots like an old printer.
     *
     * @class DotScreenFilter
     * @extends AbstractFilter
     * @constructor
     */
    PIXI.DotScreenFilter = function()
    {
        PIXI.AbstractFilter.call( this );

        this.passes = [this];

        // set the uniforms
        this.uniforms = {
            scale: {type: '1f', value:1},
            angle: {type: '1f', value:5},
            dimensions:   {type: '4fv', value:[0,0,0,0]}
        };

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

            'uniform float angle;',
            'uniform float scale;',

            'float pattern() {',
            '   float s = sin(angle), c = cos(angle);',
            '   vec2 tex = vTextureCoord * dimensions.xy;',
            '   vec2 point = vec2(',
            '       c * tex.x - s * tex.y,',
            '       s * tex.x + c * tex.y',
            '   ) * scale;',
            '   return (sin(point.x) * sin(point.y)) * 4.0;',
            '}',

            'void main() {',
            '   vec4 color = texture2D(uSampler, vTextureCoord);',
            '   float average = (color.r + color.g + color.b) / 3.0;',
            '   gl_FragColor = vec4(vec3(average * 10.0 - 5.0 + pattern()), color.a);',
            '}'
        ];
    };

    PIXI.DotScreenFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
    PIXI.DotScreenFilter.prototype.constructor = PIXI.DotScreenFilter;

    /**
     * The scale of the effect.
     * @property scale
     * @type Number
     */
    Object.defineProperty(PIXI.DotScreenFilter.prototype, 'scale', {
        get: function() {
            return this.uniforms.scale.value;
        },
        set: function(value) {
            this.dirty = true;
            this.uniforms.scale.value = value;
        }
    });

    /**
     * The radius of the effect.
     * @property angle
     * @type Number
     */
    Object.defineProperty(PIXI.DotScreenFilter.prototype, 'angle', {
        get: function() {
            return this.uniforms.angle.value;
        },
        set: function(value) {
            this.dirty = true;
            this.uniforms.angle.value = value;
        }
    });