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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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189
Projects/UOContent/Engines/Pathing/MovementPath.cs
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@ -8,115 +8,114 @@ using Server.PathAlgorithms.BitmapAStar;
using Server.Spells;
using Server.Targeting;
namespace Server
namespace Server;
public sealed class MovementPath
{
public sealed class MovementPath
public MovementPath(Mobile m, Point3D goal)
{
public MovementPath(Mobile m, Point3D goal)
var start = m.Location;
var map = m.Map;
Map = map;
Start = start;
Goal = goal;
if (map == null || map == Map.Internal)
{
var start = m.Location;
var map = m.Map;
Map = map;
Start = start;
Goal = goal;
if (map == null || map == Map.Internal)
{
return;
}
if (Utility.InRange(start, goal, 1))
{
return;
}
try
{
var alg = OverrideAlgorithm ?? BitmapAStarAlgorithm.Instance;
if (alg?.CheckCondition(m, map, start, goal) == true)
{
Directions = alg.Find(m, map, start, goal);
}
}
catch (Exception e)
{
Console.WriteLine("Warning: {0}: Pathing error from {1} to {2}", e.GetType().Name, start, goal);
}
return;
}
public Map Map { get; }
public Point3D Start { get; }
public Point3D Goal { get; }
public Direction[] Directions { get; }
public bool Success => Directions?.Length > 0;
public static PathAlgorithm OverrideAlgorithm { get; set; }
public static void Configure()
if (Utility.InRange(start, goal, 1))
{
CommandSystem.Register("Path", AccessLevel.GameMaster, Path_OnCommand);
CacheEvictionTimer.Configure();
PathCacheCommands.Configure();
return;
}
[Usage("Path")]
[Description("Draws a path from your current location to a targeted location.")]
public static void Path_OnCommand(CommandEventArgs e)
try
{
e.Mobile.BeginTarget(-1, true, TargetFlags.None, Path_OnTarget);
e.Mobile.SendMessage("Target a location and a path will be drawn there.");
}
var alg = OverrideAlgorithm ?? BitmapAStarAlgorithm.Instance;
private static void Path(Mobile from, IPoint3D p, PathAlgorithm alg, string name, int zOffset)
{
OverrideAlgorithm = alg;
var watch = new Stopwatch();
watch.Start();
var path = new MovementPath(from, new Point3D(p));
watch.Stop();
if (!path.Success)
if (alg?.CheckCondition(m, map, start, goal) == true)
{
from.SendMessage($"{name} path failed: {watch.ElapsedMilliseconds}ms");
}
else
{
from.SendMessage($"{name} path success: {watch.ElapsedMilliseconds}ms");
var x = from.X;
var y = from.Y;
var z = from.Z;
WayPoint waypoint = null;
for (var i = 0; i < path.Directions.Length; ++i)
{
Movement.Movement.Offset(path.Directions[i], ref x, ref y);
waypoint = new WayPoint(waypoint);
waypoint.MoveToWorld(new Point3D(x, y, z + zOffset), from.Map);
}
Directions = alg.Find(m, map, start, goal);
}
}
public static void Path_OnTarget(Mobile from, object targeted)
catch (Exception e)
{
if (targeted is not IPoint3D p)
{
return;
}
SpellHelper.GetSurfaceTop(ref p);
Path(from, p, BitmapAStarAlgorithm.Instance, "Bitmap", 0);
OverrideAlgorithm = null;
Console.WriteLine("Warning: {0}: Pathing error from {1} to {2}", e.GetType().Name, start, goal);
}
}
public Map Map { get; }
public Point3D Start { get; }
public Point3D Goal { get; }
public Direction[] Directions { get; }
public bool Success => Directions?.Length > 0;
public static PathAlgorithm OverrideAlgorithm { get; set; }
public static void Configure()
{
CommandSystem.Register("Path", AccessLevel.GameMaster, Path_OnCommand);
CacheEvictionTimer.Configure();
PathCacheCommands.Configure();
}
[Usage("Path")]
[Description("Draws a path from your current location to a targeted location.")]
public static void Path_OnCommand(CommandEventArgs e)
{
e.Mobile.BeginTarget(-1, true, TargetFlags.None, Path_OnTarget);
e.Mobile.SendMessage("Target a location and a path will be drawn there.");
}
private static void Path(Mobile from, IPoint3D p, PathAlgorithm alg, string name, int zOffset)
{
OverrideAlgorithm = alg;
var watch = new Stopwatch();
watch.Start();
var path = new MovementPath(from, new Point3D(p));
watch.Stop();
if (!path.Success)
{
from.SendMessage($"{name} path failed: {watch.ElapsedMilliseconds}ms");
}
else
{
from.SendMessage($"{name} path success: {watch.ElapsedMilliseconds}ms");
var x = from.X;
var y = from.Y;
var z = from.Z;
WayPoint waypoint = null;
for (var i = 0; i < path.Directions.Length; ++i)
{
Movement.Movement.Offset(path.Directions[i], ref x, ref y);
waypoint = new WayPoint(waypoint);
waypoint.MoveToWorld(new Point3D(x, y, z + zOffset), from.Map);
}
}
}
public static void Path_OnTarget(Mobile from, object targeted)
{
if (targeted is not IPoint3D p)
{
return;
}
SpellHelper.GetSurfaceTop(ref p);
Path(from, p, BitmapAStarAlgorithm.Instance, "Bitmap", 0);
OverrideAlgorithm = null;
}
}