phaser/docs/TiltShiftYFilter.js.html
2014-12-04 11:33:42 +00:00

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<h1 class="page-title">Source: d:/wamp/www/phaser/src/pixi/filters/TiltShiftYFilter.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @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 &lt;= 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;
};
</pre>
</article>
</section>
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