/**
 * Bloom post-processing pass.
 * Downsample chain: HDR → 1/2 → 1/4 → 1/8 → 1/16 (threshold on first pass).
 * Upsample chain: 1/16 → 1/8 → 1/4 → 1/2 → full (additive blend).
 * Output: full-res bloom texture.
 */
export declare class BloomPass {
    threshold: number;
    intensity: number;
    radius: number;
    private readonly _device;
    private readonly _downPipeline;
    private readonly _upPipeline;
    private readonly _sampler;
    private readonly _downBGL;
    private readonly _upBGL;
    private readonly _passBuffers;
    private readonly _paramsData;
    private _mipTextures;
    private _mipViews;
    private _width;
    private _height;
    constructor(device: GPUDevice);
    private _ensureMips;
    /** Execute bloom and return the bloom texture view to be composited with HDR scene. */
    execute(encoder: GPUCommandEncoder, hdrTexture: GPUTexture): GPUTextureView;
    destroy(): void;
}
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