import * as THREE from 'three/webgpu';
/**
 * Display-space blend bracket for the raster splat draw.
 *
 * Every 3DGS forward model alpha-blends DISPLAY-encoded colors, but three's WebGPU pipeline keeps a
 * linear framebuffer and encodes after blending. Fixed-function blending cannot express the trained
 * blend there (measured on SH3 fur: −5.4 dB, +0.06 luminance, −0.10 saturation), so the splat draw
 * is bracketed by two fullscreen passes inside the same render pass: `clear` saves the scene color
 * and zeroes the target, the splats accumulate display-space color and coverage against the native
 * depth buffer, and `resolve` composites that stack over the saved scene in display space and
 * writes the result back as linear.
 *
 * The three draws must stay adjacent in the transparent list. three sorts by render order, then by
 * the projected bounding-sphere CENTER, then by Object3D id: the passes pin their sphere center to
 * the local origin (the splat quad's), so the sort falls through to the id. Create the `clear`
 * pass, then the splat mesh, then the `resolve` pass, and parent them in that order.
 */
export declare class SplatBlendBracket {
    _geometry: THREE.BufferGeometry;
    _textures: THREE.FramebufferTexture[];
    _materials: {
        clear: THREE.NodeMaterial;
        resolve: THREE.NodeMaterial;
    };
    passes: THREE.Mesh[];
    constructor();
    /** Create one fullscreen pass mesh (see the class note on creation order). */
    createPass(name: 'clear' | 'resolve'): THREE.Mesh;
    setActive(active: boolean): void;
    dispose(): void;
}