import type { Camera } from "../Cameras/camera";
import type { Scene } from "../scene";
import { Matrix, Vector3 } from "../Maths/math.vector";
import type { AbstractMesh } from "../Meshes/abstractMesh";
import { Light } from "./light";
import type { Nullable } from "../types.js";
/**
 * Interface describing all the common properties and methods a shadow light needs to implement.
 * This helps both the shadow generator and materials to generate the corresponding shadow maps
 * as well as binding the different shadow properties to the effects.
 */
export interface IShadowLight extends Light {
    /**
     * The light id in the scene (used in scene.getLightById for instance)
     */
    id: string;
    /**
     * The position the shadow will be casted from.
     */
    position: Vector3;
    /**
     * In 2d mode (needCube being false), the direction used to cast the shadow.
     */
    direction: Vector3;
    /**
     * The transformed position. Position of the light in world space taking parenting in account.
     */
    transformedPosition: Vector3;
    /**
     * The transformed direction. Direction of the light in world space taking parenting in account.
     */
    transformedDirection: Vector3;
    /**
     * The friendly name of the light in the scene.
     */
    name: string;
    /**
     * Defines the shadow projection clipping minimum z value.
     */
    shadowMinZ: number;
    /**
     * Defines the shadow projection clipping maximum z value.
     */
    shadowMaxZ: number;
    /**
     * Computes the transformed information (transformedPosition and transformedDirection in World space) of the current light
     * @returns true if the information has been computed, false if it does not need to (no parenting)
     */
    computeTransformedInformation(): boolean;
    /**
     * Gets the scene the light belongs to.
     * @returns The scene
     */
    getScene(): Scene;
    /**
     * Callback defining a custom Projection Matrix Builder.
     * This can be used to override the default projection matrix computation.
     */
    customProjectionMatrixBuilder: (viewMatrix: Matrix, renderList: Array<AbstractMesh>, result: Matrix) => void;
    /**
     * Sets the shadow projection matrix in parameter to the generated projection matrix.
     * @param matrix The matrix to update with the projection information
     * @param viewMatrix The transform matrix of the light
     * @param renderList The list of mesh to render in the map
     * @returns The current light
     */
    setShadowProjectionMatrix(matrix: Matrix, viewMatrix: Matrix, renderList: Array<AbstractMesh>): IShadowLight;
    /**
     * Gets the current depth scale used in ESM.
     * @returns The scale
     */
    getDepthScale(): number;
    /**
     * Returns whether or not the shadow generation require a cube texture or a 2d texture.
     * @returns true if a cube texture needs to be use
     */
    needCube(): boolean;
    /**
     * Detects if the projection matrix requires to be recomputed this frame.
     * @returns true if it requires to be recomputed otherwise, false.
     */
    needProjectionMatrixCompute(): boolean;
    /**
     * Forces the shadow generator to recompute the projection matrix even if position and direction did not changed.
     */
    forceProjectionMatrixCompute(): void;
    /**
     * Get the direction to use to render the shadow map. In case of cube texture, the face index can be passed.
     * @param faceIndex The index of the face we are computed the direction to generate shadow
     * @returns The set direction in 2d mode otherwise the direction to the cubemap face if needCube() is true
     */
    getShadowDirection(faceIndex?: number): Vector3;
    /**
     * Gets the minZ used for shadow according to both the scene and the light.
     * @param activeCamera The camera we are returning the min for
     * @returns the depth min z
     */
    getDepthMinZ(activeCamera: Nullable<Camera>): number;
    /**
     * Gets the maxZ used for shadow according to both the scene and the light.
     * @param activeCamera The camera we are returning the max for
     * @returns the depth max z
     */
    getDepthMaxZ(activeCamera: Nullable<Camera>): number;
}
/**
 * Base implementation IShadowLight
 * It groups all the common behaviour in order to reduce duplication and better follow the DRY pattern.
 */
export declare abstract class ShadowLight extends Light implements IShadowLight {
    protected abstract _setDefaultShadowProjectionMatrix(matrix: Matrix, viewMatrix: Matrix, renderList: Array<AbstractMesh>): void;
    protected _position: Vector3;
    protected _setPosition(value: Vector3): void;
    /**
     * Sets the position the shadow will be casted from. Also use as the light position for both
     * point and spot lights.
     */
    get position(): Vector3;
    /**
     * Sets the position the shadow will be casted from. Also use as the light position for both
     * point and spot lights.
     */
    set position(value: Vector3);
    protected _direction: Vector3;
    protected _setDirection(value: Vector3): void;
    /**
     * In 2d mode (needCube being false), gets the direction used to cast the shadow.
     * Also use as the light direction on spot and directional lights.
     */
    get direction(): Vector3;
    /**
     * In 2d mode (needCube being false), sets the direction used to cast the shadow.
     * Also use as the light direction on spot and directional lights.
     */
    set direction(value: Vector3);
    protected _shadowMinZ: number;
    /**
     * Gets the shadow projection clipping minimum z value.
     */
    get shadowMinZ(): number;
    /**
     * Sets the shadow projection clipping minimum z value.
     */
    set shadowMinZ(value: number);
    protected _shadowMaxZ: number;
    /**
     * Sets the shadow projection clipping maximum z value.
     */
    get shadowMaxZ(): number;
    /**
     * Gets the shadow projection clipping maximum z value.
     */
    set shadowMaxZ(value: number);
    /**
     * Callback defining a custom Projection Matrix Builder.
     * This can be used to override the default projection matrix computation.
     */
    customProjectionMatrixBuilder: (viewMatrix: Matrix, renderList: Array<AbstractMesh>, result: Matrix) => void;
    /**
     * The transformed position. Position of the light in world space taking parenting in account. Needs to be computed by calling computeTransformedInformation.
     */
    transformedPosition: Vector3;
    /**
     * The transformed direction. Direction of the light in world space taking parenting in account.
     */
    transformedDirection: Vector3;
    private _needProjectionMatrixCompute;
    /**
     * Computes the transformed information (transformedPosition and transformedDirection in World space) of the current light
     * @returns true if the information has been computed, false if it does not need to (no parenting)
     */
    computeTransformedInformation(): boolean;
    /**
     * Return the depth scale used for the shadow map.
     * @returns the depth scale.
     */
    getDepthScale(): number;
    /**
     * Get the direction to use to render the shadow map. In case of cube texture, the face index can be passed.
     * @param faceIndex The index of the face we are computed the direction to generate shadow
     * @returns The set direction in 2d mode otherwise the direction to the cubemap face if needCube() is true
     */
    getShadowDirection(faceIndex?: number): Vector3;
    /**
     * If computeTransformedInformation has been called, returns the ShadowLight absolute position in the world. Otherwise, returns the local position.
     * @returns the position vector in world space
     */
    getAbsolutePosition(): Vector3;
    /**
     * Sets the ShadowLight direction toward the passed target.
     * @param target The point to target in local space
     * @returns the updated ShadowLight direction
     */
    setDirectionToTarget(target: Vector3): Vector3;
    /**
     * Returns the light rotation in euler definition.
     * @returns the x y z rotation in local space.
     */
    getRotation(): Vector3;
    /**
     * Returns whether or not the shadow generation require a cube texture or a 2d texture.
     * @returns true if a cube texture needs to be use
     */
    needCube(): boolean;
    /**
     * Detects if the projection matrix requires to be recomputed this frame.
     * @returns true if it requires to be recomputed otherwise, false.
     */
    needProjectionMatrixCompute(): boolean;
    /**
     * Forces the shadow generator to recompute the projection matrix even if position and direction did not changed.
     */
    forceProjectionMatrixCompute(): void;
    /** @internal */
    _initCache(): void;
    /** @internal */
    _isSynchronized(): boolean;
    /**
     * Computes the world matrix of the node
     * @param force defines if the cache version should be invalidated forcing the world matrix to be created from scratch
     * @returns the world matrix
     */
    computeWorldMatrix(force?: boolean): Matrix;
    /**
     * Gets the minZ used for shadow according to both the scene and the light.
     * @param activeCamera The camera we are returning the min for
     * @returns the depth min z
     */
    getDepthMinZ(activeCamera: Nullable<Camera>): number;
    /**
     * Gets the maxZ used for shadow according to both the scene and the light.
     * @param activeCamera The camera we are returning the max for
     * @returns the depth max z
     */
    getDepthMaxZ(activeCamera: Nullable<Camera>): number;
    /**
     * Sets the shadow projection matrix in parameter to the generated projection matrix.
     * @param matrix The matrix to updated with the projection information
     * @param viewMatrix The transform matrix of the light
     * @param renderList The list of mesh to render in the map
     * @returns The current light
     */
    setShadowProjectionMatrix(matrix: Matrix, viewMatrix: Matrix, renderList: Array<AbstractMesh>): IShadowLight;
    /** @internal */
    protected _syncParentEnabledState(): void;
    protected _viewMatrix: Matrix;
    protected _projectionMatrix: Matrix;
    /**
     * Returns the view matrix.
     * @param faceIndex The index of the face for which we want to extract the view matrix. Only used for point light types.
     * @returns The view matrix. Can be null, if a view matrix cannot be defined for the type of light considered (as for a hemispherical light, for example).
     */
    getViewMatrix(faceIndex?: number): Nullable<Matrix>;
    /**
     * Returns the projection matrix.
     * Note that viewMatrix and renderList are optional and are only used by lights that calculate the projection matrix from a list of meshes (e.g. directional lights with automatic extents calculation).
     * @param viewMatrix The view transform matrix of the light (optional).
     * @param renderList The list of meshes to take into account when calculating the projection matrix (optional).
     * @returns The projection matrix. Can be null, if a projection matrix cannot be defined for the type of light considered (as for a hemispherical light, for example).
     */
    getProjectionMatrix(viewMatrix?: Matrix, renderList?: Array<AbstractMesh>): Nullable<Matrix>;
}