import type { EffectComposer } from "postprocessing";
import type { EffectComposer as ThreeEffectComposer } from "three/examples/jsm/postprocessing/EffectComposer.js";
import type { Context } from "../engine_context.js";
import type { IPostProcessingEffect, IPostProcessingHandler } from "./types.js";
/**
 * Core postprocessing stack accessible via `context.postprocessing`.
 * Manages the effect pipeline independently of any specific component.
 *
 * Volumes and individual PostProcessingEffect components add/remove effects
 * to this stack. The stack builds the EffectComposer pipeline when dirty.
 *
 * @example Add an effect directly
 * ```ts
 * const bloom = new BloomEffect({ intensity: 3 });
 * this.context.postprocessing.addEffect(bloom);
 * ```
 *
 * @example Remove an effect
 * ```ts
 * this.context.postprocessing.removeEffect(bloom);
 * ```
 */
export declare class PostProcessing {
    private readonly _context;
    private _handler;
    private readonly _effects;
    private _isDirty;
    /** Currently active postprocessing effects in the stack */
    get effects(): readonly IPostProcessingEffect[];
    get dirty(): boolean;
    set dirty(value: boolean);
    /** The internal PostProcessingHandler that manages the EffectComposer pipeline */
    get handler(): IPostProcessingHandler | null;
    /**
     * The effect composer used to render postprocessing effects.
     * This is set internally by the PostProcessingHandler when effects are applied.
     */
    get composer(): EffectComposer | ThreeEffectComposer | null;
    set composer(value: EffectComposer | ThreeEffectComposer | null);
    private _composer;
    /**
     * Set multisampling to "auto" to automatically adjust the multisampling level based on performance.
     * Set to a number to manually set the multisampling level.
     * @default "auto"
     */
    multisampling: "auto" | number;
    /** When enabled, the device pixel ratio will be gradually reduced when FPS is low
     * and restored when performance recovers.
     * @default true
     */
    adaptiveResolution: boolean;
    constructor(context: Context);
    /**
     * Add a post processing effect to the stack.
     * The effect stack will be rebuilt on the next update.
     */
    addEffect(effect: IPostProcessingEffect): void;
    /**
     * Remove a post processing effect from the stack.
     * The effect stack will be rebuilt on the next update.
     */
    removeEffect(effect: IPostProcessingEffect): void;
    /** Mark the stack as dirty so the effects are rebuilt on the next update */
    markDirty(): void;
    private _enabledTime;
    private _multisampleAutoChangeTime;
    private _multisampleAutoDecreaseTime;
    /** @internal Called from the context render loop to update the postprocessing pipeline */
    update(): void;
    private _lastApplyTime?;
    private _rapidApplyCount;
    /** When true, tonemapping is applied directly to the renderer (no full pipeline) */
    private _tonemappingOnlyActive;
    private _previousToneMapping?;
    private _previousToneMappingExposure?;
    private apply;
    /** Restore renderer tonemapping to previous values when leaving tonemapping-only mode */
    private restoreTonemapping;
    /** Lazily creates the PostProcessingHandler to avoid loading the postprocessing library until actually needed */
    private ensureHandler;
    /** @internal */
    dispose(): void;
}