/**
 * Resource handler for the `material` asset type. Loads material JSON into a
 * {@link StandardMaterial} and binds the texture assets it references. A custom parser may
 * produce another kind of {@link Material}.
 *
 * @category Asset
 */
export class MaterialHandler extends ResourceHandler {
    /**
     * Create a new MaterialHandler instance.
     *
     * @param {AppBase} app - The running {@link AppBase}.
     * @ignore
     */
    constructor(app: AppBase);
    _assets: import("../asset/asset-registry.js").AssetRegistry;
    _placeholders: PlaceholderTextures;
    _parser: JsonStandardMaterialParser;
    patch(asset: any, assets: any): void;
    _onAssetUnload(asset: any): void;
    _assignTexture(parameterName: any, materialAsset: any, texture: any): void;
    /**
     * Returns the placeholder texture for a texture parameter of a material while its texture
     * asset loads. The placeholder decodes like the texture of the asset, and the parameters of
     * the material which reference the same texture asset get the same placeholder, as they get
     * the same texture, so the material is drawn with the same shader before and after the texture
     * loads.
     *
     * @param {string} parameterName - The name of the texture parameter.
     * @param {Asset} materialAsset - The material asset.
     * @param {Asset} textureAsset - The texture asset the parameter references.
     * @returns {Texture} The placeholder texture.
     * @private
     */
    private _getPlaceholderTexture;
    _assignPlaceholderTexture(parameterName: any, materialAsset: any, textureAsset: any): void;
    _onTextureLoad(parameterName: any, materialAsset: any, textureAsset: any): void;
    _onTextureAdd(parameterName: any, materialAsset: any, textureAsset: any): void;
    _onTextureRemoveOrUnload(parameterName: any, materialAsset: any, textureAsset: any): void;
    _assignCubemap(parameterName: any, materialAsset: any, textures: any): void;
    _onCubemapLoad(parameterName: any, materialAsset: any, cubemapAsset: any): void;
    _onCubemapAdd(parameterName: any, materialAsset: any, cubemapAsset: any): void;
    _onCubemapRemoveOrUnload(parameterName: any, materialAsset: any, cubemapAsset: any): void;
    _bindAndAssignAssets(materialAsset: any, assets: any): void;
}
import { ResourceHandler } from './handler.js';
import { PlaceholderTextures } from './placeholder-textures.js';
import { JsonStandardMaterialParser } from '../parsers/material/json-standard-material.js';
import type { AppBase } from '../app-base.js';