Enum ChunkBiomeSampler 

pub enum ChunkBiomeSampler<'a> {
    Overworld(Box<OverworldChunkBiomeSampler<'a>>),
    Nether(Box<NetherChunkBiomeSampler<'a>>),
    End(Box<EndChunkBiomeSampler<'a>>),
}

Per-chunk biome sampler with internal caches.

Created by BiomeSourceKind::chunk_sampler for each chunk. Holds per-chunk caches: column-level density function values and an R-tree warm-start index that resets each chunk for deterministic biome selection.

Uses enum dispatch instead of dyn to avoid vtable overhead on the hot per-quart sampling path (1536 calls per overworld chunk).

Variants

Overworld(Box<OverworldChunkBiomeSampler<'a>>)

Overworld sampler (climate → R-tree lookup).

Nether(Box<NetherChunkBiomeSampler<'a>>)

Nether sampler (climate → R-tree lookup).

End(Box<EndChunkBiomeSampler<'a>>)

End sampler (spatial distance thresholds).

Implementations

impl ChunkBiomeSampler<'_>

pub fn sample(&mut self, quart_x: i32, quart_y: i32, quart_z: i32) -> BiomeRef

Get the biome at the given quart position.

pub fn init_grid(&mut self, chunk_block_x: i32, chunk_block_z: i32)

Pre-populate the per-chunk flat-noise grid so a full-chunk biome fill reuses vanilla’s NoiseChunk.FlatCache (O(1) column lookups) instead of recomputing flat (xz-only) climate noise for every quart cell.

Call once per chunk, before sampling, passing the chunk’s minimum block coordinates. No-op for the End, which selects biomes spatially and has no column cache. Samplers used for sparse, scattered lookups (e.g. find_biome_horizontal) intentionally skip this and keep lazy caching.