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import { KawaseBlurFilter } from '@pixi/filter-kawase-blur';
import { vertex } from '@tools/fragments';
import fragment from './dropshadow.frag';
import { Filter } from '@pixi/core';
import { settings } from '@pixi/settings';
import { DEG_TO_RAD, Point } from '@pixi/math';
import { rgb2hex, hex2rgb } from '@pixi/utils';
import type { FilterSystem, RenderTexture } from '@pixi/core';
import type { CLEAR_MODES } from '@pixi/constants';
import type { IPoint } from '@pixi/math';
type PixelSizeValue = number | number[] | IPoint;
interface DropShadowFilterOptions {
rotation: number;
distance: number;
color: number;
alpha: number;
shadowOnly: boolean;
blur: number;
quality: number;
kernels: number[] | null;
pixelSize: PixelSizeValue;
resolution: number;
}
/**
* Drop shadow filter.<br>
* 
* @class
* @extends PIXI.Filter
* @memberof PIXI.filters
* @see @pixi/filter-drop-shadow
* @see pixi-filters
*/
class DropShadowFilter extends Filter
{
/** Default constructor options. */
public static readonly defaults: DropShadowFilterOptions = {
rotation: 45,
distance: 5,
color: 0x000000,
alpha: 0.5,
shadowOnly: false,
kernels: null,
blur: 2,
quality: 3,
pixelSize: 1,
resolution: settings.FILTER_RESOLUTION,
};
/** Hide the contents, only show the shadow. */
public shadowOnly: boolean;
/** Angle of the shadow in degrees. */
public angle = 45;
private _distance = 5;
private _tintFilter: Filter;
private _blurFilter: KawaseBlurFilter;
protected _resolution: number = settings.FILTER_RESOLUTION;
/**
* @param {object} [options] - Filter options
* @param {number} [options.rotation=45] - The angle of the shadow in degrees.
* @param {number} [options.distance=5] - Distance of shadow
* @param {number} [options.color=0x000000] - Color of the shadow
* @param {number} [options.alpha=0.5] - Alpha of the shadow
* @param {boolean} [options.shadowOnly=false] - Whether render shadow only
* @param {number} [options.blur=2] - Sets the strength of the Blur properties simultaneously
* @param {number} [options.quality=3] - The quality of the Blur filter.
* @param {number[]} [options.kernels=null] - The kernels of the Blur filter.
* @param {number|number[]|PIXI.Point} [options.pixelSize=1] - the pixelSize of the Blur filter.
* @param {number} [options.resolution=PIXI.settings.FILTER_RESOLUTION] - The resolution of the Blur filter.
*/
constructor(options?: Partial<DropShadowFilterOptions>)
{
super();
const opt: DropShadowFilterOptions = options
? { ...DropShadowFilter.defaults, ...options }
: DropShadowFilter.defaults;
const { kernels, blur, quality, pixelSize, resolution } = opt;
this._tintFilter = new Filter(vertex, fragment);
this._tintFilter.uniforms.color = new Float32Array(4);
this._tintFilter.uniforms.shift = new Point();
this._tintFilter.resolution = resolution;
this._blurFilter = kernels
? new KawaseBlurFilter(kernels)
: new KawaseBlurFilter(blur, quality);
this.pixelSize = pixelSize;
this.resolution = resolution;
const { shadowOnly, rotation, distance, alpha, color } = opt;
this.shadowOnly = shadowOnly;
this.rotation = rotation;
this.distance = distance;
this.alpha = alpha;
this.color = color;
this._updatePadding();
}
apply(filterManager: FilterSystem, input: RenderTexture, output: RenderTexture, clear: CLEAR_MODES): void
{
const target = filterManager.getFilterTexture();
this._tintFilter.apply(filterManager, input, target, 1);
this._blurFilter.apply(filterManager, target, output, clear);
if (this.shadowOnly !== true)
{
filterManager.applyFilter(this, input, output, 0);
}
filterManager.returnFilterTexture(target);
}
/**
* Recalculate the proper padding amount.
* @private
*/
private _updatePadding()
{
this.padding = this.distance + (this.blur * 2);
}
/**
* Update the transform matrix of offset angle.
* @private
*/
private _updateShift()
{
this._tintFilter.uniforms.shift.set(
this.distance * Math.cos(this.angle),
this.distance * Math.sin(this.angle),
);
}
/**
* The resolution of the filter.
* @default PIXI.settings.FILTER_RESOLUTION
*/
get resolution(): number
{
return this._resolution;
}
set resolution(value: number)
{
this._resolution = value;
if (this._tintFilter)
{
this._tintFilter.resolution = value;
}
if (this._blurFilter)
{
this._blurFilter.resolution = value;
}
}
/**
* Distance offset of the shadow
* @default 5
*/
get distance(): number
{
return this._distance;
}
set distance(value: number)
{
this._distance = value;
this._updatePadding();
this._updateShift();
}
/**
* The angle of the shadow in degrees
* @default 2
*/
get rotation(): number
{
return this.angle / DEG_TO_RAD;
}
set rotation(value: number)
{
this.angle = value * DEG_TO_RAD;
this._updateShift();
}
/**
* The alpha of the shadow
* @default 1
*/
get alpha(): number
{
return this._tintFilter.uniforms.alpha;
}
set alpha(value: number)
{
this._tintFilter.uniforms.alpha = value;
}
/**
* The color of the shadow.
* @default 0x000000
*/
get color(): number
{
return rgb2hex(this._tintFilter.uniforms.color);
}
set color(value: number)
{
hex2rgb(value, this._tintFilter.uniforms.color);
}
/**
* Sets the kernels of the Blur Filter
*/
get kernels(): number[]
{
return this._blurFilter.kernels;
}
set kernels(value: number[])
{
this._blurFilter.kernels = value;
}
/**
* The blur of the shadow
* @default 2
*/
get blur(): number
{
return this._blurFilter.blur;
}
set blur(value: number)
{
this._blurFilter.blur = value;
this._updatePadding();
}
/**
* Sets the quality of the Blur Filter
* @default 4
*/
get quality(): number
{
return this._blurFilter.quality;
}
set quality(value: number)
{
this._blurFilter.quality = value;
}
/**
* Sets the pixelSize of the Kawase Blur filter
*
* @member {number|number[]|PIXI.Point}
* @default 1
*/
get pixelSize(): PixelSizeValue
{
return this._blurFilter.pixelSize;
}
set pixelSize(value: PixelSizeValue)
{
this._blurFilter.pixelSize = value;
}
}
export { DropShadowFilter };
export type { DropShadowFilterOptions };