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feat(A.5 T4): StreamingRegion ComputeFirstTickDiff

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Adds the first-tick bootstrap diff: ToLoadNear for the (2*near+1)^2 inner
window, ToLoadFar for the outer annulus up to FarRadius. Uses Chebyshev
distance, matching existing Recenter convention.

Also renames the single-tier RecenterTo → RecenterToSingleTier to free
the canonical name for the upcoming two-tier overload (T5). Updates
StreamingRegionTests and StreamingController to call the renamed method.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-09 22:34:55 +02:00
parent 378f32ac7a
commit 7bcababf82
4 changed files with 54 additions and 6 deletions
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8
tests/AcDream.Core.Tests/Streaming/StreamingRegionTests.cs
View file

@ -36,7 +36,7 @@ public class StreamingRegionTests
{
var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
var diff = region.RecenterTo(50, 50);
var diff = region.RecenterToSingleTier(50, 50);
Assert.Empty(diff.ToLoad);
Assert.Empty(diff.ToUnload);
@ -52,7 +52,7 @@ public class StreamingRegionTests
// the radius+2 threshold, so it stays loaded (hysteresis keeps radius+2).
var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
var diff = region.RecenterTo(51, 50);
var diff = region.RecenterToSingleTier(51, 50);
Assert.Equal(5, diff.ToLoad.Count);
Assert.Empty(diff.ToUnload);
@ -71,7 +71,7 @@ public class StreamingRegionTests
// x=48 is now 5 away, > radius+2 = 4 → unload. x=49 is 4 away, not > 4 → keep. x=50 is 3 away, not > 4 → keep.
var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
var diff = region.RecenterTo(53, 50);
var diff = region.RecenterToSingleTier(53, 50);
Assert.Equal(15, diff.ToLoad.Count);
Assert.Equal(5, diff.ToUnload.Count);
@ -82,7 +82,7 @@ public class StreamingRegionTests
{
var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
var diff = region.RecenterTo(200, 200);
var diff = region.RecenterToSingleTier(200, 200);
Assert.Equal(25, diff.ToLoad.Count);
Assert.Equal(25, diff.ToUnload.Count);

14
tests/AcDream.Core.Tests/Streaming/StreamingRegionTwoTierTests.cs
View file

@ -20,4 +20,18 @@ public class StreamingRegionTwoTierTests
// becomes (NearRadius+2) for the far-tier unload, which is wrong.
Assert.Equal(region.FarRadius, region.Radius);
}
[Fact]
public void RecenterTo_FirstTick_SplitsLoadIntoNearAndFar()
{
// near=1, far=3 → near window is 3×3=9, far window is 7×7-3×3=40 LBs.
var region = new StreamingRegion(centerX: 100, centerY: 100, nearRadius: 1, farRadius: 3);
var diff = region.ComputeFirstTickDiff();
Assert.Equal(9, diff.ToLoadNear.Count);
Assert.Equal(40, diff.ToLoadFar.Count);
Assert.Empty(diff.ToPromote);
Assert.Empty(diff.ToDemote);
Assert.Empty(diff.ToUnload);
}
}