import { BufferGeometry, InstancedMesh, LineSegments, Matrix4, Mesh } from 'three';
import { InstancedLods } from '../render/lods/InstancedLods';
/**
 * Function signatures for using with SceneManager callbacks.
 */
export declare namespace SceneCallbacks {
    /**
     * Callback function for models load progress event.
     * @param progress - progress of loaded models in percent.
     */
    type ProgressCallbackFunction = (progress: number) => void;
    /**
     * Callback function for load model event.
     * @param modelId - GUID for loaded model.
     */
    type LoadedCallbackFunction = (modelId: string, isLastModel: boolean) => void;
    /**
     * Callback function for notFound model event.
     * @param modelId - GUID for loaded model.
     */
    type NotFoundCallbackFunction = (modelId: string) => void;
    /**
     * Callback function for error model event.
     * @param modelId - GUID for loaded model.
     * @param error - error message.
     */
    type ErrorCallbackFunction = (modelId: string, error: string) => void;
    /**
     * Callback function called for each buffer vertex with custom value.
     * @param geometry - Current BufferGeometry instance.
     * @param elNum - Current element number.
     * @param idx - Current buffer index in BufferGeometry instance.
     * @param val - Current custom value.
     */
    type TraverseMeshValCallbackFunction = (geometry: BufferGeometry, elNum: number, idx: number, val: any) => void;
    /**
     * Callback function called for each buffer vertex.
     * @param geometry - Current BufferGeometry instance.
     * @param elNum - Current element number.
     * @param idx - Current buffer index in BufferGeometry instance.
     */
    type TraverseMeshCallbackFunction = (geometry: BufferGeometry, elNum: number, idx: number, val?: any) => void;
    /**
     * Callback function called at the end of each buffer traversing.
     * @param geometry - Current BufferGeometry instance.
     * @param isMesh - Is buffer mesh or line.
     */
    type EndTraverseMeshCallbackFunction = (geometry: BufferGeometry, isMesh: boolean, object: Mesh | LineSegments) => void;
    /**
     * Callback function called at the start of each buffer before traversing.
     * @param geometry - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     * @param isMesh - Is buffer mesh or line.
     */
    type StartTraverseMeshCallbackFunction = (geometry: BufferGeometry, objIdx: number, isMesh: boolean, object: Mesh | LineSegments) => void;
    /**
     * Callback function called for each mesh instance item.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     * @param elNum - Current element number.
     * @param matrix - Transformation matrix for current item.
     * @param idx - Instance item number.
     * @param val - Current custom value.
     */
    type TraverseInstanceMeshValCallbackFunction = (child: InstancedMesh, objIdx: number, elNum: number, matrix: Matrix4, idx: number, val: any) => void;
    /**
     * Callback function called for each instanced mesh item.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     * @param elNum - Current element number.
     * @param matrix - Transformation matrix for current item.
     * @param idx - Instance item number.
     */
    type TraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number, elNum: number, matrix: Matrix4, idx: number, val?: any) => void;
    /**
     * Callback function called at the end of instanced mesh traversing.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     */
    type EndTraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number) => void;
    /**
     * Callback function called at the start of instanced mesh traversing.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     */
    type StartTraverseInstancedMeshCallbackFunction = (child: InstancedMesh, objIdx: number) => void;
    /**
     * Callback function called for each LOD instance item.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     * @param elNum - Current element number.
     * @param matrix - Transformation matrix for current item.
     * @param idx - Instance item number.
     */
    type TraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number, elNum: number, matrix: Matrix4, idx: number) => void;
    /**
     * Callback function called at the end of LOD traversing.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     */
    type EndTraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number) => void;
    /**
     * Callback function called at the start of LOD traversing.
     * @param child - Current BufferGeometry instance.
     * @param objIdx - Current mesh index.
     */
    type StartTraverseInstancedLodsCallbackFunction = (child: InstancedLods, objIdx: number) => void;
    /**
     * Options with callbacks used in traverse functions of {@link SceneManager}.
     * Used for changing buffers data for particular elements in traversing loop.
     * @param meshCallback - See {@link TraverseMeshCallbackFunction}
     * @param endMeshCallback - See {@link EndTraverseMeshCallbackFunction}
     * @param startMeshCallback - See {@link StartTraverseMeshCallbackFunction}
     * @param instanceMeshCallback - See {@link TraverseInstancedMeshCallbackFunction}
     * @param startInstanceMeshCallback - See {@link StartTraverseInstancedMeshCallbackFunction}
     * @param endInstanceMeshCallback - See {@link EndTraverseInstancedMeshCallbackFunction}
     * @param instancedLodsCallback - See {@link TraverseInstancedLodsCallbackFunction}
     * @param startInstancedLodsCallback - See {@link StartTraverseInstancedLodsCallbackFunction}
     * @param endInstancedLodsCallback - See {@link EndTraverseInstancedLodsCallbackFunction}
     */
    interface TraverseCallbackOptions {
        meshCallback?: SceneCallbacks.TraverseMeshCallbackFunction;
        endMeshCallback?: SceneCallbacks.EndTraverseMeshCallbackFunction;
        startMeshCallback?: SceneCallbacks.StartTraverseMeshCallbackFunction;
        instancedMeshCallback?: SceneCallbacks.TraverseInstancedMeshCallbackFunction;
        startInstancedMeshCallback?: SceneCallbacks.StartTraverseInstancedMeshCallbackFunction;
        endInstancedMeshCallback?: SceneCallbacks.EndTraverseInstancedMeshCallbackFunction;
        instancedLodsCallback?: SceneCallbacks.TraverseInstancedLodsCallbackFunction;
        startInstancedLodsCallback?: SceneCallbacks.StartTraverseInstancedLodsCallbackFunction;
        endInstancedLodsCallback?: SceneCallbacks.EndTraverseInstancedLodsCallbackFunction;
    }
}