checkpoint: preserve cathedral look-in investigation state

src/AcDream.App/Rendering/RetailPViewPassExecutor.WalkLeaf.cs

@@ -1,4 +1,5 @@
 using System.Numerics;
+using AcDream.App.Rendering.Scene;
 using AcDream.App.Rendering.Walk;
 using AcDream.Core.Vfx;
 
@@ -151,6 +152,8 @@ internal sealed partial class RetailPViewPassExecutor
         int count = Math.Min(vertices.Length, world.Length);
         for (int vertex = 0; vertex < count; vertex++)
             world[vertex] = vertices[vertex];
+        if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeWalkRootEnabled)
+            WalkLookInPunchCountThisFrame++;
         _portalDepthMask.DrawDepthFan(
             world[..count],
             frame.ViewProjection,
@@ -201,6 +204,9 @@ internal sealed class WalkProductionLeafRenderer : IWalkFrameLeafRenderer
     private readonly Action _drawExitSeals;
     private readonly HashSet<uint> _singleCellScratch = new();
     private readonly List<uint> _singleCellListScratch = new();
+    private readonly HashSet<uint> _lookInParticleOwnerScratch = new();
+    private RenderFrameView _entityFrame;
+    private bool _entityFrameBound;
 
     internal WalkProductionLeafRenderer(
         RetailPViewPassExecutor passes,
@@ -242,6 +248,55 @@ internal sealed class WalkProductionLeafRenderer : IWalkFrameLeafRenderer
         _passes.DrawLandscapeStaticParticles(
             _frame, new RetailPViewLandscapeStaticParticleContext(ownerIds));
 
+    /// <summary>Binds the packed frame product built after the walk's Collect
+    /// pass and before Replay. The walk records route indices during Collect;
+    /// Replay consumes the matching product ranges through this exact view.</summary>
+    internal void BindEntityFrame(in RenderFrameView view)
+    {
+        _entityFrame = view;
+        _entityFrameBound = true;
+    }
+
+    public void DrawLookInDynamics(
+        uint cellId,
+        int routeIndex,
+        IReadOnlySet<uint> staticParticleOwnerIds)
+    {
+        if (!_entityFrameBound)
+        {
+            throw new InvalidOperationException(
+                "Walk look-in dynamics replayed before the packed entity frame was bound.");
+        }
+
+        _passes.UseIndoorMembershipOnlyRouting();
+        _passes.DrawEntityRoute(
+            _frame.Camera,
+            in _entityFrame,
+            RenderFrameCandidateRoute.LookInObject,
+            routeIndex,
+            cellId,
+            _frame.PlayerLandblockId ?? 0u);
+
+        _lookInParticleOwnerScratch.Clear();
+        _lookInParticleOwnerScratch.UnionWith(staticParticleOwnerIds);
+        RenderFrameRouteOwnerSelector.Union(
+            _lookInParticleOwnerScratch,
+            in _entityFrame,
+            RenderFrameCandidateRoute.LookInObject,
+            routeIndex,
+            cellId);
+        if (_lookInParticleOwnerScratch.Count > 0)
+        {
+            _passes.DrawCellParticles(
+                _frame,
+                new RetailPViewCellSliceContext(
+                    cellId,
+                    default,
+                    _lookInParticleOwnerScratch));
+        }
+
+    }
+
     public void DrawExitSeals() => _drawExitSeals();
 
     public void DrawPunchFan(WalkPolygon worldPolygon, int activeViewIndex) =>