Struct MipUpload 

pub struct MipUpload {
    pub vsid: u32,
    pub cz: u32,
    pub occ_words_per_col: u32,
    pub occupancy: Vec<u32>,
    pub solid_occupancy: Vec<u32>,
    pub color_offsets: Vec<u32>,
    pub colors: Vec<u32>,
}

GPU.11 — one mip level of a chunk in the GPU upload shape. Mip-N has (vsid >> mip)² columns spanning z = 0..CHUNK_Z >> mip.

color_offsets are absolute within the chunk’s whole colour block (cumulative across mips): mip-0’s run [0..n0], mip-1’s run [n0..n0+n1], etc. So colors of all mips concatenated in level order index directly via chunk_colors_base + offset + rank — the same formula the shader already uses for mip-0, independent of which mip is being read.

Fields

vsid: u32

XY column extent at this mip = vsid >> mip.

cz: u32

Z-extent at this mip = CHUNK_Z >> mip.

occ_words_per_col: u32

Occupancy words per column at this mip = cz.div_ceil(32).

occupancy: Vec<u32>

vsid² * occ_words_per_col packed textured occupancy bits (one set bit per voxel that has an explicit colour). The shader rank-counts these for the colour lookup.

solid_occupancy: Vec<u32>

Same shape as occupancy, but one set bit per solid voxel — textured surfaces and the implicit bedrock interior below them. The marcher hit-tests against this so vertical wall/cliff faces are opaque; bedrock hits inherit the colour of the textured surface above them. (Fixes the “cliff face shows sky” bedrock-as-air artifact.)

color_offsets: Vec<u32>

vsid² + 1 cumulative-within-chunk colour offsets.

colors: Vec<u32>

This mip’s packed BGRA colours (ascending z within a column, columns in x + y*vsid order).

Trait Implementations

impl Clone for MipUpload

fn clone(&self) -> MipUpload

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MipUpload

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.