INNER CODE UNIT · Python

mip_count_for

untoldengine/UntoldEngine · scripts/texbake.py:234

def mip_count_for(width: int, height: int) -> int:
    """Number of mip levels for a texture of the given base dimensions."""
    return int(math.floor(math.log2(max(width, height)))) + 1


def generate_mip_chain(img: "Image.Image") -> list["Image.Image"]:
    """
    Return a list of PIL Images from mip 0 (full-res) down to mip N (1×1 or smallest).
    Downsampling uses LANCZOS in the encoded gamma space, which is the standard
    approach. For sRGB textures this introduces a small linearisation error at mip
    boundaries; acceptable for production game content.
    """
    # Ensure RGBA so the ASTC encoder always receives a 4-channel input.
    img = img.convert("RGBA")
    base_w, base_h = img.size
    levels = mip_count_for(base_w, base_h)
    mips: list[Image.Image] = [img]
    for level in range(1, levels):

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