import type { Vector3, Quaternion } from '@holoscript/core';
/**
 * DecalSystem.ts
 *
 * Projected decals: texture projection, sorting, atlas UV,
 * lifetime fade, object pooling, and layer filtering.
 *
 * @module rendering
 */
export interface DecalDef {
    id: string;
    textureId: string;
    atlasRegion?: {
        u: number;
        v: number;
        w: number;
        h: number;
    };
    size: Vector3;
    position: Vector3;
    rotation: Quaternion;
    normal: Vector3;
    color: {
        r: number;
        g: number;
        b: number;
        a: number;
    };
    layer: number;
    sortOrder: number;
    lifetime: number;
    fadeInDuration: number;
    fadeOutDuration: number;
    active: boolean;
    age: number;
    opacity: number;
}
export declare class DecalSystem {
    private decals;
    private pool;
    private maxDecals;
    private layerMask;
    setMaxDecals(max: number): void;
    getMaxDecals(): number;
    setLayerMask(mask: number): void;
    spawn(config: Partial<DecalDef> & {
        textureId: string;
        position: DecalDef['position'];
        normal: DecalDef['normal'];
    }): DecalDef;
    remove(id: string): void;
    update(dt: number): void;
    getDecal(id: string): DecalDef | undefined;
    getActiveCount(): number;
    getPoolSize(): number;
    getVisible(frustumTest?: (pos: DecalDef['position']) => boolean): DecalDef[];
    private getOldest;
    clear(): void;
}
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