import { Runner } from '@pixi/runner';
/**
* Base resource class for textures that manages validation and uploading, depending on its type.
*
* Uploading of a base texture to the GPU is required.
*
* @class
* @memberof PIXI.resources
*/
export class Resource {
/**
* @param {number} [width=0] - Width of the resource
* @param {number} [height=0] - Height of the resource
*/
constructor(width = 0, height = 0) {
/**
* Internal width of the resource
* @member {number}
* @protected
*/
this._width = width;
/**
* Internal height of the resource
* @member {number}
* @protected
*/
this._height = height;
/**
* If resource has been destroyed
* @member {boolean}
* @readonly
* @default false
*/
this.destroyed = false;
/**
* `true` if resource is created by BaseTexture
* useful for doing cleanup with BaseTexture destroy
* and not cleaning up resources that were created
* externally.
* @member {boolean}
* @protected
*/
this.internal = false;
/**
* Mini-runner for handling resize events
* accepts 2 parameters: width, height
*
* @member {Runner}
* @private
*/
this.onResize = new Runner('setRealSize');
/**
* Mini-runner for handling update events
*
* @member {Runner}
* @private
*/
this.onUpdate = new Runner('update');
/**
* Handle internal errors, such as loading errors
* accepts 1 param: error
*
* @member {Runner}
* @private
*/
this.onError = new Runner('onError');
}
/**
* Bind to a parent BaseTexture
*
* @param {PIXI.BaseTexture} baseTexture - Parent texture
*/
bind(baseTexture) {
this.onResize.add(baseTexture);
this.onUpdate.add(baseTexture);
this.onError.add(baseTexture);
// Call a resize immediate if we already
// have the width and height of the resource
if (this._width || this._height) {
this.onResize.emit(this._width, this._height);
}
}
/**
* Unbind to a parent BaseTexture
*
* @param {PIXI.BaseTexture} baseTexture - Parent texture
*/
unbind(baseTexture) {
this.onResize.remove(baseTexture);
this.onUpdate.remove(baseTexture);
this.onError.remove(baseTexture);
}
/**
* Trigger a resize event
* @param {number} width - X dimension
* @param {number} height - Y dimension
*/
resize(width, height) {
if (width !== this._width || height !== this._height) {
this._width = width;
this._height = height;
this.onResize.emit(width, height);
}
}
/**
* Has been validated
* @readonly
* @member {boolean}
*/
get valid() {
return !!this._width && !!this._height;
}
/**
* Has been updated trigger event
*/
update() {
if (!this.destroyed) {
this.onUpdate.emit();
}
}
/**
* This can be overridden to start preloading a resource
* or do any other prepare step.
* @protected
* @return {Promise<void>} Handle the validate event
*/
load() {
return Promise.resolve(this);
}
/**
* The width of the resource.
*
* @member {number}
* @readonly
*/
get width() {
return this._width;
}
/**
* The height of the resource.
*
* @member {number}
* @readonly
*/
get height() {
return this._height;
}
/**
* Set the style, optional to override
*
* @param {PIXI.Renderer} renderer - yeah, renderer!
* @param {PIXI.BaseTexture} baseTexture - the texture
* @param {PIXI.GLTexture} glTexture - texture instance for this webgl context
* @returns {boolean} `true` is success
*/
style(_renderer, _baseTexture, _glTexture) {
return false;
}
/**
* Clean up anything, this happens when destroying is ready.
*
* @protected
*/
dispose() {
// override
}
/**
* Call when destroying resource, unbind any BaseTexture object
* before calling this method, as reference counts are maintained
* internally.
*/
destroy() {
if (!this.destroyed) {
this.destroyed = true;
this.dispose();
this.onError.removeAll();
this.onError = null;
this.onResize.removeAll();
this.onResize = null;
this.onUpdate.removeAll();
this.onUpdate = null;
}
}
/**
* Abstract, used to auto-detect resource type
*
* @static
* @param {*} source - The source object
* @param {string} extension - The extension of source, if set
*/
static test(_source, _extension) {
return false;
}
}