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Per-chunk hydrology samples

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- terrain painter reads the chunk's column array once instead of 256 cache lookups
- test pins chunk samples against per-column lookups on a real plan
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Brian Neumann-Fopiano committed 2026-09-28 15:54:23 -04:00
1 parent 6202ae5d06
commit 7ac5ffdb81
5 files changed
+69 -1
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core/src/test/java/art/arcane/iris/generation/hydrology/HydrologyTileCacheTest.java
+28
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@@ -1125,6 +1125,34 @@ public class HydrologyTileCacheTest {
}
}
@Test
public void chunkSamplesMatchPerColumnLookups() {
HydrologyTileCache perColumn = new HydrologyTileCache(new HydrologyPlanner(811L, featureSettings(), this::featureTerrain), 8);
HydrologyTileCache perChunk = new HydrologyTileCache(new HydrologyPlanner(811L, featureSettings(), this::featureTerrain), 8);
HydrologyColumnSample plannedColumn = perColumn.get(new HydrologyTileKey(0, 0)).footprint().columns().values().stream()
.filter(HydrologyColumnSample::present)
.findFirst()
.orElseThrow();
int centreChunkX = Math.floorDiv(plannedColumn.x(), 16);
int centreChunkZ = Math.floorDiv(plannedColumn.z(), 16);
int present = 0;
for (int chunkZ = centreChunkZ - 2; chunkZ <= centreChunkZ + 2; chunkZ++) {
for (int chunkX = centreChunkX - 2; chunkX <= centreChunkX + 2; chunkX++) {
HydrologyColumnSample[] samples = perChunk.chunkSamples(chunkX * 16 + 5, chunkZ * 16 + 11);
assertEquals(256, samples.length);
for (int localZ = 0; localZ < 16; localZ++) {
for (int localX = 0; localX < 16; localX++) {
HydrologyColumnSample expected = perColumn
.columnAt(chunkX * 16 + localX, chunkZ * 16 + localZ).orElse(null);
assertEquals(expected, samples[localZ * 16 + localX]);
present += expected == null ? 0 : 1;
}
}
}
}
assertTrue(present > 0);
}
@Test
public void singleColumnContributionReusesItsImmutableSample() {
HydrologyColumnSample sample = compositionSample(90, List.of(compositionLayer(11L, 80)));