import { type ImageSource } from "../../types.js";
import { type Scene } from "../../scene.js";
import { RawTexture2DArray } from "./rawTexture2DArray.js";
/**
 * These helpers populate 2D array texture layers from decoded image sources.
 * They rely on the AbstractEngine.updateTextureArrayLayerFromImageSource engine extension, which is
 * an opt-in side effect. Register it before use by importing the matching module for your backend:
 * - WebGL2:  import "../../Engines/Extensions/engine.texture2DArrayImageSource.js";
 * - WebGPU:  import "../../Engines/WebGPU/Extensions/engine.texture2DArrayImageSource.js";
 * (the full Engine build does not register it by default to keep it out of every engine bundle).
 *
 * Consuming the result: the built-in way to sample a chosen layer is Node Material's Texture block,
 * which exposes a `layer` input (feed it a Float) and samples the array at that layer for you — no
 * custom shader code required. If you instead write your own shader, declare a `sampler2DArray`
 * (GLSL) / `texture_2d_array<f32>` (WGSL) uniform and sample it with an explicit integer layer index;
 * the classic StandardMaterial / PBRMaterial texture slots are plain 2D and cannot read an array layer.
 */
/**
 * Options controlling how an image source is uploaded into a 2D array texture layer.
 */
export interface IUploadImageToTexture2DArrayLayerOptions {
    /** Defines if the source must be stored with the Y axis inverted (false by default) */
    invertY?: boolean;
    /** Defines if the source alpha must be premultiplied (false by default) */
    premultiplyAlpha?: boolean;
}
/**
 * Options controlling the creation of a 2D array texture from a list of image urls.
 */
export interface ICreateTexture2DArrayFromImageUrlsOptions extends IUploadImageToTexture2DArrayLayerOptions {
    /** Defines if mip levels should be generated (true by default) */
    generateMipMaps?: boolean;
    /** Defines the sampling mode to use (Texture.TRILINEAR_SAMPLINGMODE by default) */
    samplingMode?: number;
    /** Defines the texture type (Constants.TEXTURETYPE_UNSIGNED_BYTE by default) */
    textureType?: number;
    /** Options forwarded to createImageBitmap when decoding each url */
    imageBitmapOptions?: ImageBitmapOptions;
}
/**
 * Uploads a decoded image source (ImageBitmap, canvas, video, image element...) into a single layer of a 2D array texture.
 * This is the image-source counterpart to RawTexture2DArray.update, which only accepts raw bytes.
 * @param texture defines the 2D array texture to upload into
 * @param source defines the image source to upload
 * @param layer defines the array layer to upload into
 * @param options defines optional upload settings (invertY, premultiplyAlpha)
 */
export declare function UploadImageToTexture2DArrayLayer(texture: RawTexture2DArray, source: ImageSource, layer: number, options?: IUploadImageToTexture2DArrayLayerOptions): void;
/**
 * Fetches an image from a url, decodes it and uploads it into a single layer of a 2D array texture.
 * @param texture defines the 2D array texture to upload into
 * @param url defines the url of the image to load
 * @param layer defines the array layer to upload into
 * @param options defines optional upload settings (invertY, premultiplyAlpha)
 * @returns a promise resolved once the layer has been uploaded
 */
export declare function LoadImageToTexture2DArrayLayerAsync(texture: RawTexture2DArray, url: string, layer: number, options?: IUploadImageToTexture2DArrayLayerOptions): Promise<void>;
/**
 * Creates a 2D array texture and fills each layer from a list of image urls.
 * All images must share the same dimensions.
 * @param scene defines the hosting scene
 * @param urls defines the url of the image for each layer (at least one)
 * @param options defines optional creation and upload settings
 * @returns a promise resolved with the created RawTexture2DArray
 */
export declare function CreateTexture2DArrayFromImageUrlsAsync(scene: Scene, urls: readonly [string, ...string[]], options?: ICreateTexture2DArrayFromImageUrlsOptions): Promise<RawTexture2DArray>;