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feat(pathfinding): .swb format v8 compact index (#3b) (#2471)

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## Summary
Phase #3b (final roadmap item), stacked on #2470. Compacts the index trailer from 20 to 8 bytes/chunk.

Trammel: 19.2 MB → 17.9 MB. Roadmap total: 565 MB → 17.9 MB (−96.8%).

## Details
- Trailer stores `{ u32 packedKey = (ChunkX << 16) | ChunkY, u32 recordLength }` per chunk, in record write order; the file offset is dropped and reconstructed by cumulative recordLength from HeaderSize.
- No record reordering, no varint; fixed-stride, TryReadChunk unchanged.
- Also simplifies the accumulated `.swb` code comments across the stack.
- Format v8; v7 files rejected and re-baked once.

## Tests
v8 multi-chunk round-trip (cumulative offset reconstruction) + the v6/v7 suite; full pathfinding suite green; Release build clean.
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Kamron Batman 2026-06-07 01:22:20 -07:00 • committed by GitHub
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commit c7aaf33de9
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16 changed files with 960 additions and 868 deletions
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50
Projects/UOContent/Engines/Pathing/PathAlgorithm.cs
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@ -1,35 +1,29 @@
namespace Server.PathAlgorithms
namespace Server.PathAlgorithms;
public abstract class PathAlgorithm
{
public abstract class PathAlgorithm
private static readonly Direction[] _calcDirections =
{
private static readonly Direction[] _calcDirections =
{
Direction.Up,
Direction.North,
Direction.Right,
Direction.West,
Direction.North,
Direction.East,
Direction.Left,
Direction.South,
Direction.Down
};
Direction.Up,
Direction.North,
Direction.Right,
Direction.West,
Direction.North,
Direction.East,
Direction.Left,
Direction.South,
Direction.Down
};
public abstract bool CheckCondition(Mobile m, Map map, Point3D start, Point3D goal);
public abstract Direction[] Find(Mobile m, Map map, Point3D start, Point3D goal);
public abstract bool CheckCondition(Mobile m, Map map, Point3D start, Point3D goal);
public abstract Direction[] Find(Mobile m, Map map, Point3D start, Point3D goal);
public static Direction GetDirection(int xSource, int ySource, int xDest, int yDest)
{
var x = xDest + 1 - xSource;
var y = yDest + 1 - ySource;
var v = y * 3 + x;
public static Direction GetDirection(int xSource, int ySource, int xDest, int yDest)
{
var x = xDest + 1 - xSource;
var y = yDest + 1 - ySource;
var v = y * 3 + x;
if (v is < 0 or >= 9)
{
return Direction.North;
}
return _calcDirections[v];
}
return v is < 0 or >= 9 ? Direction.North : _calcDirections[v];
}
}