refactor(pipeline): MP1a - lift TextureKey out of the GL atlas class

src/AcDream.App/Rendering/Wb/ObjectMeshManager.cs

@@ -15,6 +15,7 @@ using System.Numerics;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
+using AcDream.Content;
 using AcDream.Core.Rendering.Wb;
 using PixelFormat = Silk.NET.OpenGL.PixelFormat;
 using BoundingBox = Chorizite.Core.Lib.BoundingBox;
@@ -114,7 +115,7 @@ namespace AcDream.App.Rendering.Wb {
     public class MeshBatchData {
         public ushort[] Indices { get; set; } = Array.Empty<ushort>();
         public (int Width, int Height, TextureFormat Format) TextureFormat { get; set; }
-        public TextureAtlasManager.TextureKey TextureKey { get; set; }
+        public TextureKey TextureKey { get; set; }
         public int TextureIndex { get; set; }
         public byte[] TextureData { get; set; } = Array.Empty<byte>();
         public PixelFormat? UploadPixelFormat { get; set; }
@@ -126,7 +127,7 @@ namespace AcDream.App.Rendering.Wb {
     /// CPU-side texture info for deduplication during background preparation.
     /// </summary>
     public class TextureBatchData {
-        public TextureAtlasManager.TextureKey Key { get; set; }
+        public TextureKey Key { get; set; }
         public byte[] TextureData { get; set; } = Array.Empty<byte>();
         public PixelFormat? UploadPixelFormat { get; set; }
         public PixelType? UploadPixelType { get; set; }
@@ -187,7 +188,7 @@ namespace AcDream.App.Rendering.Wb {
         public (int Width, int Height) TextureSize { get; set; }
         public TextureFormat TextureFormat { get; set; }
         public uint SurfaceId { get; set; }
-        public TextureAtlasManager.TextureKey Key { get; set; }
+        public TextureKey Key { get; set; }
         public DatReaderWriter.Enums.CullMode CullMode { get; set; }
         public bool IsTransparent { get; set; }
         public bool IsAdditive { get; set; }
@@ -1283,7 +1284,7 @@ namespace AcDream.App.Rendering.Wb {
                     }
 
                     var format = (texWidth, texHeight, textureFormat);
-                    var key = new TextureAtlasManager.TextureKey {
+                    var key = new TextureKey {
                         SurfaceId = surfaceId,
                         PaletteId = paletteId,
                         Stippling = poly.Stippling,
@@ -1628,7 +1629,7 @@ namespace AcDream.App.Rendering.Wb {
                                                      sourceFormat == DatReaderWriter.Enums.PixelFormat.PFID_DXT5)));
 
                     var format = (texWidth, texHeight, textureFormat);
-                    var key = new TextureAtlasManager.TextureKey {
+                    var key = new TextureKey {
                         SurfaceId = surfaceId,
                         PaletteId = paletteId,
                         Stippling = poly.Stippling,
@@ -2233,7 +2234,7 @@ namespace AcDream.App.Rendering.Wb {
                     new MeshBatchData {
                         Indices = indices.ToArray(),
                         TextureFormat = (1, 1, TextureFormat.RGBA8),
-                        TextureKey = new TextureAtlasManager.TextureKey {
+                        TextureKey = new TextureKey {
                             SurfaceId = 0xFFFFFFFF, // Dummy surface ID
                             PaletteId = 0,
                             Stippling = StipplingType.NoPos,
@@ -2251,7 +2252,7 @@ namespace AcDream.App.Rendering.Wb {
                     [(1, 1, TextureFormat.RGBA8)] = new List<TextureBatchData> {
                         new TextureBatchData {
                             Indices = indices.ToList(),
-                            Key = new TextureAtlasManager.TextureKey {
+                            Key = new TextureKey {
                                 SurfaceId = 0xFFFFFFFF, // Dummy surface ID
                                 PaletteId = 0,
                                 Stippling = StipplingType.NoPos,

src/AcDream.App/Rendering/Wb/TextureAtlasManager.cs

@@ -1,3 +1,4 @@
+using AcDream.Content;
 using Chorizite.Core.Render;
 using Chorizite.Core.Render.Enums;
 using DatReaderWriter.Enums;
@@ -94,27 +95,5 @@ namespace AcDream.App.Rendering.Wb {
             _refCounts.Clear();
             _freeSlots.Clear();
         }
-
-        public struct TextureKey : IEquatable<TextureKey> {
-            public uint SurfaceId;
-            public uint PaletteId;
-            public StipplingType Stippling;
-            public bool IsSolid;
-
-            public bool Equals(TextureKey other) {
-                return SurfaceId == other.SurfaceId &&
-                       PaletteId == other.PaletteId &&
-                       Stippling == other.Stippling &&
-                       IsSolid == other.IsSolid;
-            }
-
-            public override bool Equals(object? obj) {
-                return obj is TextureKey other && Equals(other);
-            }
-
-            public override int GetHashCode() {
-                return HashCode.Combine(SurfaceId, PaletteId, Stippling, IsSolid);
-            }
-        }
     }
 }

src/AcDream.Content/TextureKey.cs

@@ -0,0 +1,30 @@
+using DatReaderWriter.Enums;
+using System;
+
+namespace AcDream.Content;
+
+// MP1a (2026-07-05): lifted verbatim out of TextureAtlasManager (GL class)
+// so the GL-free mesh-extraction path (MeshExtractor / ObjectMeshData) can
+// reference the atlas dedup key without a Silk.NET dependency. Field set,
+// equality semantics, and hash behavior are UNCHANGED.
+public struct TextureKey : IEquatable<TextureKey> {
+    public uint SurfaceId;
+    public uint PaletteId;
+    public StipplingType Stippling;
+    public bool IsSolid;
+
+    public bool Equals(TextureKey other) {
+        return SurfaceId == other.SurfaceId &&
+               PaletteId == other.PaletteId &&
+               Stippling == other.Stippling &&
+               IsSolid == other.IsSolid;
+    }
+
+    public override bool Equals(object? obj) {
+        return obj is TextureKey other && Equals(other);
+    }
+
+    public override int GetHashCode() {
+        return HashCode.Combine(SurfaceId, PaletteId, Stippling, IsSolid);
+    }
+}