fix(vfx): classify hardwareless particle emitters once

tests/AcDream.Core.Tests/Vfx/ParticleSystemTests.cs

@@ -1,6 +1,8 @@
 using System.Linq;
 using System.Numerics;
+using AcDream.Core.Content;
 using AcDream.Core.Vfx;
+using DatReaderWriter.Lib.IO;
 using DatReaderWriter.Types;
 using Xunit;
 
@@ -267,6 +269,35 @@ public sealed class ParticleSystemTests
         Assert.Same(desc, reg.Get(0x32001234u));
     }
 
+    [Fact]
+    public void EmitterDescRegistry_NegativeCachesMissingDatAndRegisterClearsFailure()
+    {
+        int calls = 0;
+        var reg = new EmitterDescRegistry(_ =>
+        {
+            calls++;
+            return null;
+        });
+        const uint emitterId = 0x3200DEADu;
+
+        Assert.False(reg.TryGet(emitterId, out _, out var first));
+        Assert.False(reg.TryGet(emitterId, out _, out var second));
+
+        Assert.Equal(1, calls);
+        Assert.Equal(
+            EmitterDescResolutionFailureKind.MissingEmitterInfo,
+            first.Kind);
+        Assert.Equal(first, second);
+        Assert.Equal(1, reg.FailureCount);
+
+        var desc = new EmitterDesc { DatId = emitterId };
+        reg.Register(desc);
+        Assert.True(reg.TryGet(emitterId, out var resolved, out var failure));
+        Assert.Same(desc, resolved);
+        Assert.Equal(EmitterDescResolutionFailureKind.None, failure.Kind);
+        Assert.Equal(0, reg.FailureCount);
+    }
+
     [Fact]
     public void LocalVelocity_TransformsABySpawnRotation()
     {
@@ -398,6 +429,31 @@ public sealed class ParticleSystemTests
         Assert.Equal(0u, EmitterDescRegistry.GetRetailHardwareGfxObjId(dat));
     }
 
+    [Fact]
+    public void EmitterDescRegistry_ClassifiesAndCachesAuthoredHardwarelessEmitter()
+    {
+        const uint emitterId = 0x320002D6u;
+        var dats = new FakeDatObjectSource();
+        dats.Add(
+            emitterId,
+            new DatReaderWriter.DBObjs.ParticleEmitter
+            {
+                GfxObjId = 0x010016C9u,
+                HwGfxObjId = 0u,
+            });
+        var reg = new EmitterDescRegistry(dats);
+
+        Assert.False(reg.TryGet(emitterId, out _, out var first));
+        Assert.False(reg.TryGet(emitterId, out _, out var second));
+
+        Assert.Equal(
+            EmitterDescResolutionFailureKind.InvalidHardwareGfxObjId,
+            first.Kind);
+        Assert.Equal(first, second);
+        Assert.Equal(1, dats.GetCallCount(emitterId));
+        Assert.Equal(1, reg.FailureCount);
+    }
+
     [Fact]
     public void RetailParticleDegradeDistance_MatchesRetailEntrySelection()
     {
@@ -1100,4 +1156,31 @@ public sealed class ParticleSystemTests
         sys.Tick(0.01f);
         Assert.Equal(2, sys.ActiveParticleCount);
     }
+
+    private sealed class FakeDatObjectSource : IDatObjectSource
+    {
+        private readonly Dictionary<uint, IDBObj> _objects = new();
+        private readonly Dictionary<uint, int> _calls = new();
+
+        public void Add(uint id, IDBObj value) => _objects[id] = value;
+
+        public int GetCallCount(uint id) =>
+            _calls.TryGetValue(id, out int count) ? count : 0;
+
+        public T Get<T>(uint fileId) where T : IDBObj
+        {
+            _calls.TryGetValue(fileId, out int count);
+            _calls[fileId] = count + 1;
+            return _objects.TryGetValue(fileId, out IDBObj? value)
+                && value is T typed
+                    ? typed
+                    : default!;
+        }
+
+        public bool TryGet<T>(uint fileId, out T value) where T : IDBObj
+        {
+            value = Get<T>(fileId);
+            return value is not null;
+        }
+    }
 }