/** * @author Vico @vicocotea * original filter https://github.com/evanw/glfx.js/blob/master/src/filters/blur/tiltshift.js by Evan Wallace : http://madebyevan.com/ */ /** * A TiltShiftYFilter. * * @class TiltShiftYFilter * @extends AbstractFilter * @constructor */ PIXI.TiltShiftYFilter = function() { PIXI.AbstractFilter.call( this ); this.passes = [this]; // set the uniforms this.uniforms = { blur: {type: '1f', value: 100.0}, gradientBlur: {type: '1f', value: 600.0}, start: {type: '2f', value:{x:0, y:window.screenHeight / 2}}, end: {type: '2f', value:{x:600, y:window.screenHeight / 2}}, delta: {type: '2f', value:{x:30, y:30}}, texSize: {type: '2f', value:{x:window.screenWidth, y:window.screenHeight}} }; this.updateDelta(); this.fragmentSrc = [ 'precision mediump float;', 'uniform sampler2D uSampler;', 'uniform float blur;', 'uniform float gradientBlur;', 'uniform vec2 start;', 'uniform vec2 end;', 'uniform vec2 delta;', 'uniform vec2 texSize;', 'varying vec2 vTextureCoord;', 'float random(vec3 scale, float seed) {', ' return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);', '}', 'void main(void) {', ' vec4 color = vec4(0.0);', ' float total = 0.0;', ' float offset = random(vec3(12.9898, 78.233, 151.7182), 0.0);', ' vec2 normal = normalize(vec2(start.y - end.y, end.x - start.x));', ' float radius = smoothstep(0.0, 1.0, abs(dot(vTextureCoord * texSize - start, normal)) / gradientBlur) * blur;', ' for (float t = -30.0; t <= 30.0; t++) {', ' float percent = (t + offset - 0.5) / 30.0;', ' float weight = 1.0 - abs(percent);', ' vec4 sample = texture2D(uSampler, vTextureCoord + delta / texSize * percent * radius);', ' sample.rgb *= sample.a;', ' color += sample * weight;', ' total += weight;', ' }', ' gl_FragColor = color / total;', ' gl_FragColor.rgb /= gl_FragColor.a + 0.00001;', '}' ]; }; PIXI.TiltShiftYFilter.prototype = Object.create( PIXI.AbstractFilter.prototype ); PIXI.TiltShiftYFilter.prototype.constructor = PIXI.TiltShiftYFilter; /** * The strength of the blur. * * @property blur * @type Number */ Object.defineProperty(PIXI.TiltShiftYFilter.prototype, 'blur', { get: function() { return this.uniforms.blur.value; }, set: function(value) { this.dirty = true; this.uniforms.blur.value = value; } }); /** * The strength of the gradient blur. * * @property gradientBlur * @type Number */ Object.defineProperty(PIXI.TiltShiftYFilter.prototype, 'gradientBlur', { get: function() { return this.uniforms.gradientBlur.value; }, set: function(value) { this.dirty = true; this.uniforms.gradientBlur.value = value; } }); /** * The Y value to start the effect at. * * @property start * @type Number */ Object.defineProperty(PIXI.TiltShiftYFilter.prototype, 'start', { get: function() { return this.uniforms.start.value; }, set: function(value) { this.dirty = true; this.uniforms.start.value = value; this.updateDelta(); } }); /** * The Y value to end the effect at. * * @property end * @type Number */ Object.defineProperty(PIXI.TiltShiftYFilter.prototype, 'end', { get: function() { return this.uniforms.end.value; }, set: function(value) { this.dirty = true; this.uniforms.end.value = value; this.updateDelta(); } }); /** * Updates the filter delta values. * * @method updateDelta */ PIXI.TiltShiftYFilter.prototype.updateDelta = function(){ var dx = this.uniforms.end.value.x - this.uniforms.start.value.x; var dy = this.uniforms.end.value.y - this.uniforms.start.value.y; var d = Math.sqrt(dx * dx + dy * dy); this.uniforms.delta.value.x = -dy / d; this.uniforms.delta.value.y = dx / d; };