/**
 * Helper functions to support prefiltering lighting data.
 *
 * @ignore
 */
export class EnvLighting {
    /**
     * Generate a skybox cubemap in the correct pixel format from the source texture.
     *
     * @param {Texture} source - The source texture. This is either a 2d texture in equirect format
     * or a cubemap.
     * @param {number} [size] - Size of the resulting texture. Otherwise use automatic sizing.
     * @returns {Texture} The resulting cubemap.
     */
    static generateSkyboxCubemap(source: Texture, size?: number): Texture;
    /**
     * Create a texture in the format needed to precalculate lighting data.
     *
     * @param {Texture} source - The source texture. This is either a 2d texture in equirect format
     * or a cubemap.
     * @param {object} [options] - Specify generation options.
     * @param {Texture} [options.target] - The target texture. If one is not provided then a
     * new texture will be created and returned.
     * @param {number} [options.size] - Size of the lighting source cubemap texture. Only used
     * if target isn't specified. Defaults to 128.
     * @returns {Texture} The resulting cubemap.
     */
    static generateLightingSource(source: Texture, options?: {
        target?: Texture;
        size?: number;
    }): Texture;
    /**
     * Generate the environment lighting atlas containing prefiltered reflections and ambient.
     *
     * @param {Texture} source - The source lighting texture, generated by generateLightingSource.
     * @param {object} [options] - Specify prefilter options.
     * @param {Texture} [options.target] - The target texture. If one is not provided then a
     * new texture will be created and returned.
     * @param {number} [options.size] - Size of the target texture to create. Only used if
     * target isn't specified. Defaults to 512.
     * @param {number} [options.numReflectionSamples] - Number of samples to use when generating
     * rough reflections. Defaults to 1024.
     * @param {number} [options.numAmbientSamples] - Number of samples to use when generating ambient
     * lighting. Defaults to 2048.
     * @returns {Texture} The resulting atlas
     */
    static generateAtlas(source: Texture, options?: {
        target?: Texture;
        size?: number;
        numReflectionSamples?: number;
        numAmbientSamples?: number;
    }): Texture;
    /**
     * Generate the environment lighting atlas from prefiltered cubemap data.
     *
     * @param {Texture[]} sources - Array of 6 prefiltered textures.
     * @param {object} [options] - The options object
     * @param {Texture} [options.target] - The target texture. If one is not provided then a
     * new texture will be created and returned.
     * @param {number} [options.size] - Size of the target texture to create. Only used if
     * target isn't specified. Defaults to 512.
     * @param {boolean} [options.legacyAmbient] - Enable generating legacy ambient lighting.
     * Default is false.
     * @param {number} [options.numSamples] - Number of samples to use when generating ambient
     * lighting. Default is 2048.
     * @returns {Texture} The resulting atlas texture.
     */
    static generatePrefilteredAtlas(sources: Texture[], options?: {
        target?: Texture;
        size?: number;
        legacyAmbient?: boolean;
        numSamples?: number;
    }): Texture;
}
import { Texture } from '../../platform/graphics/texture.js';