Module preliminary_surface_store 

share preliminary surface levels across chunks

quart-aligned lookups agree on cached and raw paths, so neighbors can reuse them

Structs

PreliminarySurfaceStore

shared surface levels, one atomic word per entry reads see a complete entry or miss; collisions just mean recomputing

Constants

AXIS_BITS 🔒

512 quarts per axis, enough for a 128-chunk span without slot collisions

AXIS_MASK 🔒

COORD_BITS 🔒

Packed slot layout: valid (1) | quart_x (24) | quart_z (24) | level (15).

COORD_MASK 🔒

COORD_MAX 🔒

COORD_MIN 🔒

LEVEL_BITS 🔒

LEVEL_MASK 🔒

LEVEL_MAX 🔒

LEVEL_MIN 🔒

VALID 🔒

Functions

pack_level 🔒

pack the level if it fits

unpack_level 🔒

unpack the level, keeping its sign