import { Texture } from 'pixi.js';
import type { Environment } from '../../materials/environment/Environment';
import type { BaseMaterialOptions, BaseUniforms } from './BaseMaterial';
import { BaseMaterial } from './BaseMaterial';
/**
 * PBR materials breakdown can be found here: https://
 * https://learnopengl.com/PBR/Theory
 */
export interface PBRMaterialOptions extends BaseMaterialOptions {
    /**
     * the exposure of the tone mapping. Default is 1
     */
    exposure?: number;
    /**
     * 0 / 1 value to dictate how metallic the material is.
     */
    metallic?: number;
    /**
     * 0 / 1 value to dictate how rough the material is.
     */
    roughness?: number;
    /** a metal roughness texture with the following format:
     * B - metal
     * G - roughness
     */
    metallicRoughnessMap?: Texture;
    /**
     * a texture with the following format:
     * R - ambient occlusion
     * B - metal
     * G - roughness
     * */
    aomrMap?: Texture;
    /**
     * optional map to calculate the split sum more info here: https://learnopengl.com/PBR/IBL/Specular-IBL
     * if this is not provided, one is generated and loaded for you
     */
    brdfLUT?: Texture;
    /**
     * an optional environment to light using IBL
     */
    environment?: Environment;
    /**
     * true if you want good old reinhard tone mapping
     * defaults to true
     */
    toneMapping?: boolean;
    uniforms?: PBRUniforms;
}
/**
 * the possible uniforms that this shader may added to the shader
 */
export interface PBRUniforms extends BaseUniforms {
    uMetallicRoughnessMap?: Texture;
    uSpecularEnvironmentMap?: Texture;
    uSphericalHarmonics?: Float32Array;
    uBrdfLUT?: Texture;
}
export declare class PBRMaterial extends BaseMaterial<PBRUniforms> {
    constructor(options?: PBRMaterialOptions);
    set roughness(value: number);
    get roughness(): number;
}
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