import type { GLTFLoaderOptions } from "../../gltf-loader.js";
import type { GLTF } from "../types/gltf-json-schema.js";
import type { GLTFWithBuffers } from "../types/gltf-types.js";
/**
 * Exact extension identifiers accepted by the shared meshopt decoder.
 *
 * The two extensions deliberately remain separate capabilities even though their JSON layouts are
 * compatible: KHR adds version 1 attribute streams and the `COLOR` filter, while existing EXT
 * assets continue to require the EXT identifier.
 */
export type MeshoptCompressionExtensionName = 'KHR_meshopt_compression' | 'EXT_meshopt_compression';
/**
 * Decompresses every buffer view that uses one meshopt extension.
 *
 * The Khronos and vendor extensions share their buffer-view layout, but the Khronos extension
 * additionally permits version 1 attribute streams and the `COLOR` filter. A buffer view or
 * fallback buffer cannot opt into both extensions because the specifications define them as
 * mutually exclusive. The extension object identifies the compressed source range; the parent
 * buffer view identifies the destination range that will contain `count * byteStride`
 * decompressed bytes.
 *
 * Extension objects, fallback-buffer markers, and top-level `extensionsUsed` and
 * `extensionsRequired` declarations are removed only after every matching buffer view decodes
 * successfully. Source buffers containing compressed bytes remain in `gltfData.buffers`; the
 * loader does not compact or renumber buffers.
 *
 * @param gltfData Parsed glTF JSON and its resolved buffers.
 * @param options glTF loader options controlling buffer loading and mesh decompression.
 * @param extensionName Meshopt extension to process.
 * @returns A promise that resolves after all matching buffer views are decoded and their extension
 * declarations are removed.
 * @throws If KHR and EXT declarations are mixed on the same buffer view or buffer, or if a
 * compressed stream cannot be decoded.
 */
export declare function decodeMeshoptCompression(gltfData: GLTFWithBuffers, options: GLTFLoaderOptions, extensionName: MeshoptCompressionExtensionName): Promise<void>;
/**
 * Enforces the KHR/EXT capability invariant before any compressed bytes are decoded.
 *
 * Khronos specifies the two extension identifiers as mutually exclusive on both compressed buffer
 * views and fallback buffers. Validating the whole document before decoding prevents traversal
 * order from turning an invalid mixed declaration into partially decoded output.
 *
 * @param gltf Parsed glTF document.
 * @throws If one buffer view or buffer declares both `KHR_meshopt_compression` and
 * `EXT_meshopt_compression`.
 */
export declare function validateMeshoptCompressionExclusivity(gltf: GLTF): void;
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