# /// script
# requires-python = ">=3.10"
# dependencies = []
# ///
"""
@effect identity
@version 1.0.0
@author @giles@artdag.rose-ash.com
@temporal false

@description
Identity effect - returns input unchanged. This is the foundational
effect where identity(x) = x. Uses frame-by-frame API but simply
passes frames through unmodified.

@example
  (fx identity)
"""

import numpy as np


def process_frame(frame: np.ndarray, params: dict, state) -> tuple:
    """
    Identity: return frame unchanged.

    Args:
        frame: RGB frame as numpy array (H, W, 3)
        params: Unused
        state: Passed through unchanged

    Returns:
        (frame, state) - both unchanged
    """
    return frame, state