Function estimate_texture_bytes 

pub fn estimate_texture_bytes(
    format: TextureFormat,
    width: u32,
    height: u32,
    depth_or_array_layers: u32,
    sample_count: u32,
    mip_level_count: u32,
) -> u64

Available on crate feature wgpu only.

Estimate the on-device byte footprint of a 2D / 3D texture.

Charges every mip level and every array layer / depth slice. Mip dimensions follow the wgpu convention (max(1, dim >> level)). Sample count multiplies the base level only (mip levels above 0 of an MSAA texture are not allocated by any current driver — sample expansion on level > 0 is a validation error in wgpu and every hardware spec we care about).