import { IExtensionFactory, IExtensionInstance } from "./IExtension";
import GltfLoader from "../io/GltfLoader";
import Gltf2 from "../types/Gltf2";
import Material from "nanogl-pbr/Material";
import Primitive from "../elements/Primitive";
import Node from "../elements/Node";
import Gltf from "../Gltf";
import MaterialPass from "nanogl-pbr/MaterialPass";
/**
 * Context object passed to material and pass override factories, if needed when overriding a material or pass
 */
export declare type MaterialOverrideFactoryContext = {
    /**
     * The gltf material data to override
     */
    data: Gltf2.IMaterial;
    /**
     * The gltf object containing the material
     */
    gltf: Gltf;
    /**
     * The node containing the primitive
     */
    node: Node;
    /**
     * The primitive which will use the material
     */
    primitive: Primitive;
};
/**
 * Simple material or material override factory function returning a Material
 */
export declare type MaterialOverrideFactory = Material | ((ctx: MaterialOverrideFactoryContext) => Material);
/**
 * Simple pass or pass override factory function returning a MaterialPass
 */
export declare type PassOverrideFactory = MaterialPass | ((ctx: MaterialOverrideFactoryContext, material: Material) => MaterialPass | null);
/**
 * This extension allows all materials and their passes to be overriden by custom code at load time.
 * Useful to add custom shading, completely replace a material, add Chunk effect to every materials of a GLTF, ...
 */
export default class MaterialOverrideExtension implements IExtensionFactory {
    readonly name: string;
    /**
     * Map of material override factories
     */
    readonly materials: Map<string, MaterialOverrideFactory>;
    /**
     * Map of pass override factories
     */
    readonly passes: Map<string, PassOverrideFactory>;
    /**
     * Add Material Override.
     * Gltf material with the given name will be replaced by the one created by the given material factory
     * @param name The name of the gltf material to override, if empty string the given material will be used as default override
     * @param m Material factory to use to create the override material
     */
    overrideMaterial(name: string | "", m: MaterialOverrideFactory): void;
    /**
     * Add Pass Override.
     * The Color pass of the overriden material will be replaced by the one created by the given pass factory
     * @param name The name of the material to override, if empty string is given, the pass will be applied to all materials
     * @param p Pass factory to use to create the override pass
     */
    overridePass(name: string | "", p: PassOverrideFactory): void;
    /**
     * Check that the given name is not already used by a material or pass override
     * @param name Material or pass name to check
     */
    private assertNotExist;
    createInstance(gltfLoader: GltfLoader): IExtensionInstance;
}