node_modules/three/src/textures/DepthArrayTexture.js

import { DepthTexture } from './DepthTexture.js';

/**
 * Creates an array of depth textures.
 *
 * @augments DepthTexture
 */
class DepthArrayTexture extends DepthTexture {

	/**
	 * Constructs a new depth array texture.
	 *
	 * @param {number} [width=1] - The width of the texture.
	 * @param {number} [height=1] - The height of the texture.
	 * @param {number} [depth=1] - The depth of the texture.
	 */
	constructor( width = 1, height = 1, depth = 1 ) {

		super( width, height );

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isDepthArrayTexture = true;

		/**
		 * The image definition of a depth texture.
		 *
		 * @type {{width:number,height:number,depth:number}}
		 */
		this.image = { width: width, height: height, depth: depth };

		/**
		 * If set to `true`, the texture is flipped along the vertical axis when
		 * uploaded to the GPU.
		 *
		 * Overwritten and set to `false` by default.
		 *
		 * @type {boolean}
		 * @default false
		 */
		this.flipY = false;

		/**
		 * Whether to generate mipmaps (if possible) for a texture.
		 *
		 * Overwritten and set to `false` by default.
		 *
		 * @type {boolean}
		 * @default false
		 */
		this.generateMipmaps = false;

		/**
		 * Code corresponding to the depth compare function.
		 *
		 * @type {?(NeverCompare|LessCompare|EqualCompare|LessEqualCompare|GreaterCompare|NotEqualCompare|GreaterEqualCompare|AlwaysCompare)}
		 * @default null
		 */
		this.compareFunction = null;

		/**
		 * A set of all layers which need to be updated in the texture.
		 *
		 * @type {Set<number>}
		 */
		this.layerUpdates = new Set();

	}

	/**
	 * Describes that a specific layer of the texture needs to be updated.
	 * Normally when {@link Texture#needsUpdate} is set to `true`, the
	 * entire slice is sent to the GPU. Marking specific
	 * layers will only transmit subsets of all mipmaps associated with a
	 * specific depth in the array which is often much more performant.
	 *
	 * @param {number} layerIndex - The layer index that should be updated.
	 */
	addLayerUpdate( layerIndex ) {

		this.layerUpdates.add( layerIndex );

	}

	/**
	 * Resets the layer updates registry.
	 */
	clearLayerUpdates() {

		this.layerUpdates.clear();

	}

}

export { DepthArrayTexture };