51 lines
1.9 KiB
Rust
51 lines
1.9 KiB
Rust
// SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
use super::*;
|
|
use shared::generator::{VoxelGenerator, WorldGenConfig};
|
|
use shared::world::{BlockId, ChunkPos};
|
|
use std::num::NonZeroUsize;
|
|
|
|
/// Builds a generator with a small, cheap terrain configuration for cache tests.
|
|
fn test_generator() -> VoxelGenerator {
|
|
let config = WorldGenConfig {
|
|
base_height: 8,
|
|
noise_scale: 0.05,
|
|
surface_block: BlockId(1),
|
|
subsurface_block: BlockId(2),
|
|
stone_block: BlockId(3),
|
|
};
|
|
VoxelGenerator::new(config, 42)
|
|
}
|
|
|
|
/// A second lookup of the same position must be served from the store, not regenerated.
|
|
#[test]
|
|
fn repeated_lookup_is_a_cache_hit() {
|
|
let generator = test_generator();
|
|
let cache = ChunkCache::new(NonZeroUsize::new(4).unwrap_or(NonZeroUsize::MIN));
|
|
let pos = ChunkPos::new(0, 0, 0);
|
|
|
|
let first = cache.get_or_generate(pos, &generator);
|
|
let second = cache.get_or_generate(pos, &generator);
|
|
|
|
// Determinism guarantees identical output, and a single resident entry can only hold if the second call was a hit rather than a fresh generation-and-insert of a distinct value.
|
|
assert_eq!(first.blocks, second.blocks);
|
|
assert_eq!(cache.len(), 1);
|
|
}
|
|
|
|
/// Inserting beyond capacity evicts the least-recently-used entry.
|
|
#[test]
|
|
fn exceeding_capacity_evicts_oldest() {
|
|
let generator = test_generator();
|
|
let cache = ChunkCache::new(NonZeroUsize::new(2).unwrap_or(NonZeroUsize::MIN));
|
|
|
|
let _ = cache.get_or_generate(ChunkPos::new(0, 0, 0), &generator);
|
|
let _ = cache.get_or_generate(ChunkPos::new(1, 0, 0), &generator);
|
|
// Touch the first so the second becomes the least-recently-used before the overflow.
|
|
let _ = cache.get_or_generate(ChunkPos::new(0, 0, 0), &generator);
|
|
let _ = cache.get_or_generate(ChunkPos::new(2, 0, 0), &generator);
|
|
|
|
assert_eq!(cache.len(), 2);
|
|
assert!(cache.contains(ChunkPos::new(0, 0, 0)));
|
|
assert!(!cache.contains(ChunkPos::new(1, 0, 0)));
|
|
}
|