Struct GridStaticMeta 

#[repr(C)]
pub struct GridStaticMeta {

    pub occupancy_offset: u32,
    pub color_offsets_offset: u32,
    pub colors_offset: u32,
    pub chunk_colors_base_offset: u32,
    pub chunk_occupancy_offset: u32,
    pub slot_chunk_idx_offset: u32,
    pub vsid: u32,
    pub total_slots: u32,
    pub pool_dims: [u32; 3],
    pub _pad0: u32,
    pub occ_words_per_slot: u32,
    pub offsets_words_per_slot: u32,
    pub mip_count: u32,
    pub _pad1: u32,
    pub mip_occ_rel: [u32; 6],
    pub mip_coff_rel: [u32; 6],
    pub aabb_min: [i32; 3],
    pub _pad2: i32,
    pub aabb_max: [i32; 3],
    pub _pad3: i32,
    pub chunk_occ_mip_off: [u32; 4],
    pub chunk_occ_levels: u32,
    pub _pad4: [u32; 3],
}

Per-grid static metadata: offsets into the concatenated storage buffers + the grid’s slot-pool dimensions. Uploaded once.

GPU.7 changes: chunks_dims and origin_chunk were dropped. The shader uses modular slot indexing (chunk_idx & (pool_dims - 1)) and verifies slot identity via slot_chunk_idx[slot], so the upload-time bbox is no longer relevant to the shader.

Fields

occupancy_offset: u32

occupancy u32-word offset where this grid’s data starts.

color_offsets_offset: u32

all_color_offsets (binding 2) u32-word offset where this grid’s per-slot colour-offset tables start; slot meta_id’s window is offsets_words_per_slot words from color_offsets_offset + meta_id * offsets_words_per_slot.

colors_offset: u32

all_colors (binding 3) u32-word offset where this grid’s packed voxel colours start (per-slot blocks of the grid’s colour stride).

chunk_colors_base_offset: u32

all_chunk_colors_base (binding 4) u32-word offset of this grid’s per-slot table mapping meta_id → the slot’s colour base (in words, relative to colors_offset).

chunk_occupancy_offset: u32

all_chunk_occupancy (binding 5) u32-word offset of this grid’s chunk-occupancy bitmap: bit slot_idx & 31 of word slot_idx >> 5 is set iff the slot holds a non-empty chunk — the outer DDA’s whole-chunk skip test.

slot_chunk_idx_offset: u32

New in GPU.7: u32-word offset where this grid’s slot_chunk_idx array starts (one vec3<i32> per slot, i.e. 3 u32 words each, plus 1 padding word for std430).

vsid: u32

Chunk XY extent in voxels (typically 128); the chunk’s Z extent is the fixed CHUNK_Z = 256.

total_slots: u32

Slot count in the modular pool (pool_dims.x · pool_dims.y · pool_dims.z).

pool_dims: [u32; 3]

GPU.7 slot-pool dimensions (each a power of 2). Chunk (chx, chy, chz) lives in slot (chx & (pool_dims.x - 1), chy & …, chz & …).

_pad0: u32

std430 padding; always 0.

occ_words_per_slot: u32

GPU.11 — per-slot occupancy stride (sum over all mips). meta_id’s occupancy slab starts at occupancy_offset + meta_id * occ_words_per_slot.

offsets_words_per_slot: u32

GPU.11 — per-slot color_offsets stride (sum over all mips).

mip_count: u32

GPU.11 — number of mip levels stored per slot.

_pad1: u32

std430 padding; always 0.

mip_occ_rel: [u32; 6]

GPU.11 — within-slot u32 offset where mip m’s occupancy starts. mip_occ_rel[0] == 0 so mip-0 reads are unchanged.

mip_coff_rel: [u32; 6]

GPU.11 — within-slot u32 offset where mip m’s color_offsets start. mip_coff_rel[0] == 0.

aabb_min: [i32; 3]

GPU.13.0 — occupied chunk-AABB (inclusive) in chunk-index space. The outer DDA stops once p_chunk passes this box along the ray’s travel direction (no resident chunk can lie ahead). An empty grid uses the inverted sentinel (aabb_min = i32::MAX, aabb_max = i32::MIN) so every ray early-outs immediately. Maintained live: GpuSceneResident::refresh_chunk / GpuSceneResident::evict_chunk recompute + re-upload it.

_pad2: i32

std430 vec3<i32> padding; always 0.

aabb_max: [i32; 3]

Inclusive upper corner of the occupied chunk-AABB (chunk-index space); i32::MIN sentinel when the grid holds no chunks. See Self::aabb_min.

_pad3: i32

std430 vec3<i32> padding; always 0.

chunk_occ_mip_off: [u32; 4]

GPU.13.1 — all_chunk_occupancy u32-word offsets of this grid’s chunk-occupancy pyramid levels 1..=4 (entry l - 1 = level l; entries past Self::chunk_occ_levels are 0). Level l has max(pool_dims >> l, 1) cells per axis; a set bit means “some resident non-empty chunk maps into this slot-block” — the outer DDA’s read-free empty-block skip.

chunk_occ_levels: u32

GPU.13.1 — pyramid levels stored above L0 (0 = no pyramid, the single-chunk-pool degenerate case).

_pad4: [u32; 3]

std430 padding; always 0.

Trait Implementations

impl Clone for GridStaticMeta

fn clone(&self) -> GridStaticMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for GridStaticMeta

impl Debug for GridStaticMeta

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

Formats the value using the given formatter.

impl Pod for GridStaticMeta

impl Zeroable for GridStaticMeta

fn zeroed() -> Self

Calls zeroed.