"""Interfaz comun para backends image-to-3D.

Cada backend (triposr, hunyuan3d_2, trellis) expone:
  load() -> Handle
  donde Handle tiene metodo infer(image: PIL.Image, cfg: dict) -> bytes (GLB).

`cfg` recibe: seed, mc_resolution, foreground_ratio, texture.
"""
from __future__ import annotations

from typing import Protocol, Any, Dict
from PIL import Image


class BackendHandle(Protocol):
    def infer(self, image: Image.Image, cfg: Dict[str, Any]) -> bytes: ...
    def close(self) -> None: ...