import * as THREE from 'three';
import { BaseScatterSystem } from '../core';
/**
 * Layer configuration for biome blending
 */
export interface ScatterLayer {
    /** Unique identifier for this layer */
    name: string;
    /** The scatter system for this layer */
    system: BaseScatterSystem;
    /** Base weight for this layer (0-1) */
    weight: number;
}
/**
 * Blending configuration
 */
export interface BlenderConfig {
    /** Blend mask texture URL (each channel can represent a different layer) */
    blendMaskUrl?: string;
    /** How world coordinates map to mask UV */
    worldBounds?: THREE.Box2;
    /** Default update interval in frames (for performance) */
    updateInterval?: number;
}
/**
 * Manages multiple scatter layers with weight-based blending
 * Allows smooth transitions between biomes using mask textures
 */
export declare class ScatterBlender extends THREE.Group {
    private scatterLayers;
    private blendMask;
    private blendMaskData;
    private worldBounds;
    private updateInterval;
    private frameCount;
    private isInitialized;
    constructor(config?: BlenderConfig);
    /**
     * Initialize the blender and load blend mask
     */
    init(blendMaskUrl?: string): Promise<void>;
    /**
     * Load blend mask texture
     */
    loadBlendMask(url: string): Promise<void>;
    /**
     * Add a scatter layer
     */
    addLayer(name: string, system: BaseScatterSystem, weight?: number): void;
    /**
     * Remove a scatter layer
     */
    removeLayer(name: string): void;
    /**
     * Get a layer by name
     */
    getLayer(name: string): ScatterLayer | undefined;
    /**
     * Set layer weight dynamically
     */
    setLayerWeight(name: string, weight: number): void;
    /**
     * Sample blend mask at world position
     * Returns RGBA values (0-1) for each channel
     */
    sampleBlendMask(worldX: number, worldZ: number): {
        r: number;
        g: number;
        b: number;
        a: number;
    };
    /**
     * Update all layers
     */
    update(camera: THREE.Camera): void;
    /**
     * Get all layer names
     */
    getLayerNames(): string[];
    /**
     * Get combined statistics
     */
    getStats(): {
        layers: number;
        totalInstances: number;
        totalChunks: number;
    };
    /**
     * Dispose all layers
     */
    dispose(): void;
}
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