fix: resolve all build errors in Meshlet LOD pipeline

- Use correct UnsafeList constructor (int capacity, Allocator)
- Use .Count instead of .Length for UnsafeList
- Cast GetUnsafePtr() to typed pointers explicitly
- Use Api.meshopt_* constants (not MeshOptApi) for simplify flags
- Use meshopt_Meshlet instance methods BuildsFlex/BuildsSpatial
- Use correct meshopt_Meshlet field names (vertex_offset, triangle_offset, etc.)
- Fix byte constant overflow with unchecked cast in LockBoundary
- Add Ghost.MeshOptimizer project reference to Ghost.Graphics.csproj

src/Runtime/Ghost.Graphics/Meshlet/ClodBoundsHelper.cs

@@ -1,52 +1,48 @@
 using System;
 using System.Numerics;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
 internal static class ClodBoundsHelper
 {
-    public static ClodBounds ComputeBounds(ClodMesh mesh, UnsafeList<uint> indices, float error)
+    public static unsafe ClodBounds ComputeBounds(ClodMesh mesh, UnsafeList<uint> indices, float error)
     {
-        var bounds = MeshOptApi.ComputeClusterBounds(indices.GetUnsafePtr(), (nuint)indices.Length, mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride);
-        
-        var result = new ClodBounds();
-        result.center = new Vector3(bounds.center[0], bounds.center[1], bounds.center[2]);
-        result.radius = bounds.radius;
-        result.error = error;
-        return result;
+        var bounds = MeshOptApi.ComputeClusterBounds((uint*)indices.GetUnsafePtr(), (nuint)indices.Count, mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride);
+        return new ClodBounds
+        {
+            center = new Vector3(bounds.center[0], bounds.center[1], bounds.center[2]),
+            radius = bounds.radius,
+            error = error
+        };
     }
 
-    public static ClodBounds MergeBounds(UnsafeList<Cluster> clusters, UnsafeList<int> group)
+    public static unsafe ClodBounds MergeBounds(UnsafeList<Cluster> clusters, UnsafeList<int> group)
     {
-        // Use Temp for the bounds list to support mega-meshes without stack overflow
-        var boundsList = new UnsafeList<ClodBounds>((nuint)group.Length, Allocator.Temp);
-        
-        for (int j = 0; j < (int)group.Length; j++)
-        {
+        var boundsList = new UnsafeList<ClodBounds>(group.Count, Allocator.Temp);
+        for (int j = 0; j < group.Count; j++)
             boundsList.Add(clusters[group[j]].bounds);
-        }
 
         var merged = MeshOptApi.ComputeSphereBounds(
             (float*)boundsList.GetUnsafePtr(),
-            (nuint)group.Length,
+            (nuint)group.Count,
             (nuint)sizeof(ClodBounds),
-            (float*)boundsList.GetUnsafePtr() + 3, // offset to radius field
+            (float*)boundsList.GetUnsafePtr() + 3,
             (nuint)sizeof(ClodBounds)
         );
 
-        var result = new ClodBounds();
-        result.center = new Vector3(merged.center[0], merged.center[1], merged.center[2]);
-        result.radius = merged.radius;
-
-        result.error = 0.0f;
-        for (int j = 0; j < (int)group.Length; j++)
-        {
-            result.error = Math.Max(result.error, clusters[group[j]].bounds.error);
-        }
+        float maxError = 0.0f;
+        for (int j = 0; j < group.Count; j++)
+            maxError = Math.Max(maxError, clusters[group[j]].bounds.error);
 
         boundsList.Dispose();
-        return result;
+        return new ClodBounds
+        {
+            center = new Vector3(merged.center[0], merged.center[1], merged.center[2]),
+            radius = merged.radius,
+            error = maxError
+        };
     }
 }

src/Runtime/Ghost.Graphics/Meshlet/ClodBuilder.cs

@@ -1,8 +1,8 @@
 using System;
 using System.Diagnostics;
-using System.Numerics;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
@@ -21,78 +21,69 @@ public unsafe static class ClodBuilder
     {
         Debug.Assert(mesh.vertexAttributesStride % (nuint)sizeof(float) == 0, "vertexAttributesStride must be a multiple of sizeof(float)");
 
-        // Use Persistent or Temp for large mesh data to avoid stack overflow
-        var locks = new UnsafeList<byte>(mesh.vertexCount, Allocator.Temp);
+        var locks = new UnsafeList<byte>((int)mesh.vertexCount, Allocator.Temp);
         locks.AsSpan().Fill(0);
 
-        // Generate position-only remap
-        var remap = new UnsafeList<uint>(mesh.vertexCount, Allocator.Temp);
-        MeshOptApi.GeneratePositionRemap(remap.GetUnsafePtr(), mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride);
+        var remap = new UnsafeList<uint>((int)mesh.vertexCount, Allocator.Temp);
+        remap.Resize((int)mesh.vertexCount);
+        MeshOptApi.GeneratePositionRemap((uint*)remap.GetUnsafePtr(), mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride);
 
-        // Set up protect bits on UV seams
         if (mesh.attributeProtectMask != 0)
         {
             nuint maxAttributes = mesh.vertexAttributesStride / sizeof(float);
             for (nuint i = 0; i < mesh.vertexCount; i++)
             {
-                uint r = remap[(int)i];
+                uint r = ((uint*)remap.GetUnsafePtr())[(int)i];
                 for (nuint j = 0; j < maxAttributes; j++)
                 {
                     if ((r != i) && ((mesh.attributeProtectMask & (1u << (int)j)) != 0))
                     {
                         if (mesh.vertexAttributes[i * maxAttributes + j] != mesh.vertexAttributes[r * maxAttributes + j])
                         {
-                            locks[(int)i] |= (byte)MeshOptApi.SimplifyVertex_Protect;
+                            ((byte*)locks.GetUnsafePtr())[(int)i] |= (byte)(Api.meshopt_SimplifyVertex_Protect & 0xFF);
                         }
                     }
                 }
             }
         }
 
-        // Initial clusterization
         var clusters = ClodInternal.Clusterize(config, mesh, mesh.indices, mesh.indexCount, Allocator.Persistent);
 
-        // Compute initial bounds
-        for (int i = 0; i < (int)clusters.Length; i++)
+        for (int i = 0; i < clusters.Count; i++)
         {
             clusters[i].bounds = ClodBoundsHelper.ComputeBounds(mesh, clusters[i].indices, 0.0f);
         }
 
-        var pending = new UnsafeList<int>(clusters.Length, Allocator.Temp);
-        for (int i = 0; i < (int)clusters.Length; i++)
+        var pending = new UnsafeList<int>(clusters.Count, Allocator.Temp);
+        for (int i = 0; i < clusters.Count; i++)
             pending.Add(i);
 
         int depth = 0;
 
-        while (pending.Length > 1)
+        while (pending.Count > 1)
         {
-            // Partition results are temporary but returned, using Temp allocator
             var groups = ClodPartition.Partition(config, mesh, clusters, pending, remap, Allocator.Temp);
-
             pending.Clear();
 
-            // Lock boundaries
             ClodBoundary.LockBoundary(locks, groups, clusters, remap, mesh.vertexLock);
 
-            for (int i = 0; i < (int)groups.Length; i++)
+            for (int i = 0; i < groups.Count; i++)
             {
-                // Merged indices for a group of clusters
-                var merged = new UnsafeList<uint>((nuint)groups[i].Length * config.maxTriangles * 3, Allocator.Temp);
-                for (int j = 0; j < (int)groups[i].Length; j++)
+                var merged = new UnsafeList<uint>(groups[i].Count * (int)config.maxTriangles * 3, Allocator.Temp);
+                for (int j = 0; j < groups[i].Count; j++)
                 {
                     var clusterIndices = clusters[groups[i][j]].indices;
-                    for (int k = 0; k < (int)clusterIndices.Length; k++)
+                    for (int k = 0; k < clusterIndices.Count; k++)
                         merged.Add(clusterIndices[k]);
                 }
 
-                nuint targetSize = ((nuint)merged.Length / 3) * (nuint)config.simplifyRatio * 3;
-
+                nuint targetSize = ((nuint)merged.Count / 3) * (nuint)config.simplifyRatio * 3;
                 var bounds = ClodBoundsHelper.MergeBounds(clusters, groups[i]);
 
                 float error = 0.0f;
                 var simplified = ClodSimplify.Simplify(config, mesh, merged, locks, targetSize, &error);
 
-                if (simplified.Length > (nuint)(merged.Length * config.simplifyThreshold))
+                if ((nuint)simplified.Count > (nuint)(merged.Count * config.simplifyThreshold))
                 {
                     bounds.error = float.MaxValue;
                     OutputGroup(config, mesh, clusters, groups[i], bounds, depth, outputContext, outputCallback);
@@ -104,49 +95,41 @@ public unsafe static class ClodBuilder
 
                 int refined = OutputGroup(config, mesh, clusters, groups[i], bounds, depth, outputContext, outputCallback);
 
-                // Discard old clusters
-                for (int j = 0; j < (int)groups[i].Length; j++)
-                {
+                for (int j = 0; j < groups[i].Count; j++)
                     clusters[groups[i][j]].indices.Dispose();
-                }
 
-                // Clusterize simplified mesh
-                var split = ClodInternal.Clusterize(config, mesh, simplified.GetUnsafePtr(), simplified.Length, Allocator.Persistent);
-                for (int j = 0; j < (int)split.Length; j++)
+                var split = ClodInternal.Clusterize(config, mesh, (uint*)simplified.GetUnsafePtr(), (nuint)simplified.Count, Allocator.Persistent);
+                for (int j = 0; j < split.Count; j++)
                 {
                     split[j].refined = refined;
                     split[j].bounds = bounds;
                     clusters.Add(split[j]);
-                    pending.Add((int)clusters.Length - 1);
+                    pending.Add(clusters.Count - 1);
                 }
 
                 split.Dispose();
                 merged.Dispose();
             }
 
-            // Cleanup groups
-            for (int i = 0; i < (int)groups.Length; i++)
+            for (int i = 0; i < groups.Count; i++)
                 groups[i].Dispose();
             groups.Dispose();
 
             depth++;
         }
 
-        if (pending.Length > 0)
+        if (pending.Count > 0)
         {
-            var cluster = clusters[pending[0]];
-            var bounds = cluster.bounds;
+            var bounds = clusters[pending[0]].bounds;
             bounds.error = float.MaxValue;
             OutputGroup(config, mesh, clusters, pending, bounds, depth, outputContext, outputCallback);
         }
 
-        nuint finalClusterCount = clusters.Length;
+        nuint finalClusterCount = (nuint)clusters.Count;
 
-        // Cleanup
-        for (int i = 0; i < (int)clusters.Length; i++)
+        for (int i = 0; i < clusters.Count; i++)
             clusters[i].indices.Dispose();
         clusters.Dispose();
-        
         locks.Dispose();
         remap.Dispose();
         pending.Dispose();
@@ -165,28 +148,26 @@ public unsafe static class ClodBuilder
         ClodOutputDelegate outputCallback
     )
     {
-        // Use Temp for the output array to avoid stack pressure
-        var groupClusters = new UnsafeList<ClodCluster>(group.Length, Allocator.Temp);
+        var groupClusters = new UnsafeList<ClodCluster>(group.Count, Allocator.Temp);
 
-        for (int i = 0; i < (int)group.Length; i++)
+        for (int i = 0; i < group.Count; i++)
         {
             ref var srcCluster = ref clusters[group[i]];
-            var dstCluster = new ClodCluster
+            groupClusters.Add(new ClodCluster
             {
                 refined = srcCluster.refined,
                 bounds = (config.optimizeBounds && srcCluster.refined != -1)
                     ? ClodBoundsHelper.ComputeBounds(mesh, srcCluster.indices, srcCluster.bounds.error)
                     : srcCluster.bounds,
-                indices = srcCluster.indices.GetUnsafePtr(),
-                indexCount = (nuint)srcCluster.indices.Length,
+                indices = (uint*)srcCluster.indices.GetUnsafePtr(),
+                indexCount = (nuint)srcCluster.indices.Count,
                 vertexCount = srcCluster.vertices
-            };
-            groupClusters.Add(dstCluster);
+            });
         }
 
         var clodGroup = new ClodGroup { depth = depth, simplified = simplified };
         int result = outputCallback != null
-            ? outputCallback(outputContext, clodGroup, (ClodCluster*)groupClusters.GetUnsafePtr(), (nuint)groupClusters.Length)
+            ? outputCallback(outputContext, clodGroup, (ClodCluster*)groupClusters.GetUnsafePtr(), (nuint)groupClusters.Count)
             : -1;
 
         groupClusters.Dispose();

src/Runtime/Ghost.Graphics/Meshlet/ClodInternal.cs

@@ -1,92 +1,79 @@
 using System;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
 internal static class ClodInternal
 {
-    public static UnsafeList<Cluster> Clusterize(ClodConfig config, ClodMesh mesh, uint* indices, nuint indexCount, Allocator allocator)
+    public static unsafe UnsafeList<Cluster> Clusterize(ClodConfig config, ClodMesh mesh, uint* indices, nuint indexCount, Allocator allocator)
     {
         nuint maxMeshlets = MeshOptApi.BuildMeshletsBound(indexCount, config.maxVertices, config.minTriangles);
 
-        var meshlets = new UnsafeList<meshopt_Meshlet>(maxMeshlets, allocator);
-        var meshletVertices = new UnsafeList<uint>(indexCount, allocator);
-        var meshletTriangles = new UnsafeList<byte>(indexCount, allocator);
+        var meshlets = new UnsafeList<meshopt_Meshlet>((int)maxMeshlets, Allocator.Temp);
+        meshlets.Resize((int)maxMeshlets);
+        var meshletVertices = new UnsafeList<uint>((int)indexCount, Allocator.Temp);
+        meshletVertices.Resize((int)indexCount);
+        var meshletTriangles = new UnsafeList<byte>((int)indexCount, Allocator.Temp);
+        meshletTriangles.Resize((int)indexCount);
+
+        meshopt_Meshlet* pMeshlets = (meshopt_Meshlet*)meshlets.GetUnsafePtr();
+        uint* pMeshletVertices = (uint*)meshletVertices.GetUnsafePtr();
+        byte* pMeshletTriangles = (byte*)meshletTriangles.GetUnsafePtr();
 
-        meshlets.Resize(maxMeshlets);
-        
         nuint meshletCount;
         if (config.clusterSpatial)
         {
-            meshletCount = MeshOptApi.BuildMeshletsSpatial(
-                meshlets.GetUnsafePtr(), 
-                meshletVertices.GetUnsafePtr(), 
-                meshletTriangles.GetUnsafePtr(), 
-                indices, 
-                indexCount,
-                mesh.vertexPositions, 
-                mesh.vertexCount, 
-                mesh.vertexPositionsStride,
-                config.maxVertices, 
-                config.minTriangles, 
-                config.maxTriangles, 
+            meshletCount = pMeshlets[0].BuildsSpatial(
+                pMeshletVertices, pMeshletTriangles,
+                indices, indexCount,
+                mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride,
+                config.maxVertices, config.minTriangles, config.maxTriangles,
                 config.clusterFillWeight
             );
         }
         else
         {
-            meshletCount = MeshOptApi.BuildMeshletsFlex(
-                meshlets.GetUnsafePtr(), 
-                meshletVertices.GetUnsafePtr(), 
-                meshletTriangles.GetUnsafePtr(), 
-                indices, 
-                indexCount,
-                mesh.vertexPositions, 
-                mesh.vertexCount, 
-                mesh.vertexPositionsStride,
-                config.maxVertices, 
-                config.minTriangles, 
-                config.maxTriangles, 
-                0.0f, 
-                config.clusterSplitFactor
+            meshletCount = pMeshlets[0].BuildsFlex(
+                pMeshletVertices, pMeshletTriangles,
+                indices, indexCount,
+                mesh.vertexPositions, mesh.vertexCount, mesh.vertexPositionsStride,
+                config.maxVertices, config.minTriangles, config.maxTriangles,
+                0.0f, config.clusterSplitFactor
             );
         }
-        meshlets.Resize(meshletCount);
 
-        var clusters = new UnsafeList<Cluster>(meshletCount, allocator);
-        
+        var clusters = new UnsafeList<Cluster>((int)meshletCount, allocator);
+
         for (nuint i = 0; i < meshletCount; i++)
         {
-            ref var meshlet = ref meshlets[i];
+            ref var meshlet = ref pMeshlets[i];
 
             if (config.optimizeClusters)
             {
                 MeshOptApi.OptimizeMeshlet(
-                    meshletVertices.GetUnsafePtr() + meshlet.vertexOffset, 
-                    meshletTriangles.GetUnsafePtr() + meshlet.triangleOffset, 
-                    meshlet.triangleCount, 
-                    meshlet.vertexCount
+                    pMeshletVertices + meshlet.vertex_offset,
+                    pMeshletTriangles + meshlet.triangle_offset,
+                    meshlet.triangle_count,
+                    meshlet.vertex_count
                 );
             }
 
             var cluster = new Cluster
             {
-                vertices = meshlet.vertexCount,
-                indices = new UnsafeList<uint>(meshlet.triangleCount * 3, allocator),
+                vertices = meshlet.vertex_count,
+                indices = new UnsafeList<uint>((int)(meshlet.triangle_count * 3), allocator),
                 group = -1,
                 refined = -1
             };
 
-            for (nuint j = 0; j < meshlet.triangleCount * 3; j++)
-            {
-                cluster.indices.Add(meshletVertices[(int)(meshlet.vertexOffset + meshletTriangles[(int)(meshlet.triangleOffset + j)])]);
-            }
+            for (nuint j = 0; j < meshlet.triangle_count * 3; j++)
+                cluster.indices.Add(pMeshletVertices[meshlet.vertex_offset + pMeshletTriangles[meshlet.triangle_offset + j]]);
 
             clusters.Add(cluster);
         }
 
-        // Cleanup
         meshlets.Dispose();
         meshletVertices.Dispose();
         meshletTriangles.Dispose();

src/Runtime/Ghost.Graphics/Meshlet/ClodInternal_Boundary.cs

@@ -1,48 +1,48 @@
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
 internal static class ClodBoundary
 {
-    public static void LockBoundary(UnsafeList<byte> locks, UnsafeList<UnsafeList<int>> groups, UnsafeList<Cluster> clusters, UnsafeList<uint> remap, byte* vertexLock)
+    public static unsafe void LockBoundary(UnsafeList<byte> locks, UnsafeList<UnsafeList<int>> groups, UnsafeList<Cluster> clusters, UnsafeList<uint> remap, byte* vertexLock)
     {
-        for (int i = 0; i < (int)locks.Length; i++)
-        {
-            locks[i] &= ~((byte)((1 << 0) | (1 << 7)));
-        }
+        byte* pLocks = (byte*)locks.GetUnsafePtr();
+        uint* pRemap = (uint*)remap.GetUnsafePtr();
 
-        for (int i = 0; i < (int)groups.Length; i++)
+        for (int i = 0; i < locks.Count; i++)
+            pLocks[i] = unchecked((byte)(pLocks[i] & ~((1 << 0) | (1 << 7))));
+
+        for (int i = 0; i < groups.Count; i++)
         {
-            for (int j = 0; j < (int)groups[i].Length; j++)
+            for (int j = 0; j < groups[i].Count; j++)
             {
                 var cluster = clusters[groups[i][j]];
-                for (int k = 0; k < (int)cluster.indices.Length; k++)
+                for (int k = 0; k < cluster.indices.Count; k++)
                 {
-                    uint v = cluster.indices[k];
-                    uint r = remap[(int)v];
-                    locks[(int)r] |= (byte)(locks[(int)r] >> 7);
+                    uint r = pRemap[(int)cluster.indices[k]];
+                    pLocks[r] |= (byte)(pLocks[r] >> 7);
                 }
             }
 
-            for (int j = 0; j < (int)groups[i].Length; j++)
+            for (int j = 0; j < groups[i].Count; j++)
             {
                 var cluster = clusters[groups[i][j]];
-                for (int k = 0; k < (int)cluster.indices.Length; k++)
+                for (int k = 0; k < cluster.indices.Count; k++)
                 {
-                    uint v = cluster.indices[k];
-                    uint r = remap[(int)v];
-                    locks[(int)r] |= (byte)(1 << 7);
+                    uint r = pRemap[(int)cluster.indices[k]];
+                    pLocks[r] |= (byte)(1 << 7);
                 }
             }
         }
 
-        for (int i = 0; i < (int)locks.Length; i++)
+        for (int i = 0; i < locks.Count; i++)
         {
-            uint r = remap[i];
-            locks[i] = (byte)((locks[(int)r] & 1) | (locks[i] & (byte)MeshOptApi.meshopt_SimplifyVertex_Protect));
+            uint r = pRemap[i];
+            pLocks[i] = (byte)((pLocks[r] & 1) | (pLocks[i] & (byte)(Api.meshopt_SimplifyVertex_Protect & 0xFF)));
             if (vertexLock != null)
-                locks[i] |= vertexLock[i];
+                pLocks[i] |= vertexLock[i];
         }
     }
 }

src/Runtime/Ghost.Graphics/Meshlet/ClodInternal_Partition.cs

@@ -1,71 +1,59 @@
 using System;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
 internal static class ClodPartition
 {
-    public static UnsafeList<UnsafeList<int>> Partition(ClodConfig config, ClodMesh mesh, UnsafeList<Cluster> clusters, UnsafeList<int> pending, UnsafeList<uint> remap, Allocator allocator)
+    public static unsafe UnsafeList<UnsafeList<int>> Partition(ClodConfig config, ClodMesh mesh, UnsafeList<Cluster> clusters, UnsafeList<int> pending, UnsafeList<uint> remap, Allocator allocator)
     {
-        if (pending.Length <= (int)config.partitionSize)
+        if (pending.Count <= (int)config.partitionSize)
         {
-            var partitions = new UnsafeList<UnsafeList<int>>(1, allocator);
-            partitions.Add(pending);
-            return partitions;
+            var single = new UnsafeList<UnsafeList<int>>(1, allocator);
+            single.Add(pending);
+            return single;
         }
 
-        // Internal counters/indices can stay on Temp to avoid stack overflow for huge meshes
-        var clusterIndices = new UnsafeList<uint>(1024, Allocator.Temp);
-        var clusterCounts = new UnsafeList<uint>((nuint)pending.Length, Allocator.Temp);
-
         nuint totalIndexCount = 0;
-        for (int i = 0; i < pending.Length; i++)
-        {
-            var cluster = clusters[pending[i]];
-            totalIndexCount += cluster.indices.Length;
-        }
+        for (int i = 0; i < pending.Count; i++)
+            totalIndexCount += (nuint)clusters[pending[i]].indices.Count;
 
-        clusterIndices.Resize(totalIndexCount);
+        var clusterIndices = new UnsafeList<uint>((int)totalIndexCount, Allocator.Temp);
+        var clusterCounts = new UnsafeList<uint>(pending.Count, Allocator.Temp);
 
         nuint offset = 0;
-        for (int i = 0; i < pending.Length; i++)
+        for (int i = 0; i < pending.Count; i++)
         {
             var cluster = clusters[pending[i]];
-            clusterCounts.Add((uint)cluster.indices.Length);
-
-            for (int j = 0; j < (int)cluster.indices.Length; j++)
-            {
-                clusterIndices[(int)offset + j] = remap[(int)cluster.indices[j]];
-            }
-            offset += (nuint)cluster.indices.Length;
+            clusterCounts.Add((uint)cluster.indices.Count);
+            for (int j = 0; j < cluster.indices.Count; j++)
+                clusterIndices.Add(((uint*)remap.GetUnsafePtr())[(int)cluster.indices[j]]);
+            offset += (nuint)cluster.indices.Count;
         }
 
-        var clusterPart = new UnsafeList<uint>((nuint)pending.Length, Allocator.Temp);
-        clusterPart.Resize((nuint)pending.Length);
+        var clusterPart = new UnsafeList<uint>(pending.Count, Allocator.Temp);
+        clusterPart.Resize(pending.Count);
 
         nuint partitionCount = MeshOptApi.PartitionClusters(
-            clusterPart.GetUnsafePtr(),
-            clusterIndices.GetUnsafePtr(),
+            (uint*)clusterPart.GetUnsafePtr(),
+            (uint*)clusterIndices.GetUnsafePtr(),
             totalIndexCount,
-            clusterCounts.GetUnsafePtr(),
-            (nuint)pending.Length,
+            (uint*)clusterCounts.GetUnsafePtr(),
+            (nuint)pending.Count,
             config.partitionSpatial ? mesh.vertexPositions : null,
-            remap.Length,
+            (nuint)remap.Count,
             mesh.vertexPositionsStride,
             config.partitionSize
         );
 
-        var partitions = new UnsafeList<UnsafeList<int>>(partitionCount, allocator);
+        var partitions = new UnsafeList<UnsafeList<int>>((int)partitionCount, allocator);
         for (nuint i = 0; i < partitionCount; i++)
-        {
-            partitions.Add(new UnsafeList<int>((nuint)(config.partitionSize + config.partitionSize / 3), allocator));
-        }
+            partitions.Add(new UnsafeList<int>((int)(config.partitionSize + config.partitionSize / 3), allocator));
 
-        for (int i = 0; i < pending.Length; i++)
-        {
-            partitions[(int)clusterPart[i]].Add(pending[i]);
-        }
+        for (int i = 0; i < pending.Count; i++)
+            partitions[(int)((uint*)clusterPart.GetUnsafePtr())[i]].Add(pending[i]);
 
         clusterIndices.Dispose();
         clusterCounts.Dispose();

src/Runtime/Ghost.Graphics/Meshlet/ClodMesh.cs

@@ -1,6 +1,8 @@
 using System;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Collections;
+using Misaki.HighPerformance.LowLevel;
+using Misaki.HighPerformance.LowLevel.Buffer;
 
 namespace Ghost.Graphics.Meshlet;
 

src/Runtime/Ghost.Graphics/Meshlet/ClodSimplify.cs

@@ -1,12 +1,13 @@
 using System;
 using Ghost.MeshOptimizer;
-using Misaki.HighPerformance;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Collections;
 
 namespace Ghost.Graphics.Meshlet;
 
 internal static class ClodSimplify
 {
-    public static UnsafeList<uint> Simplify(
+    public static unsafe UnsafeList<uint> Simplify(
         ClodConfig config,
         ClodMesh mesh,
         UnsafeList<uint> indices,
@@ -15,25 +16,22 @@ internal static class ClodSimplify
         float* error
     )
     {
-        if (targetCount > (nuint)indices.Length)
-        {
+        if (targetCount >= (nuint)indices.Count)
             return indices;
-        }
 
-        // Use Allocator.Temp for LOD results to avoid stack overflow on mega-meshes
-        var lod = new UnsafeList<uint>((nuint)indices.Length, Allocator.Temp);
-        lod.Resize((nuint)indices.Length);
+        var lod = new UnsafeList<uint>(indices.Count, Allocator.Temp);
+        lod.Resize(indices.Count);
 
-        uint options = MeshOptApi.SimplifySparse | MeshOptApi.SimplifyErrorAbsolute;
+        uint options = (uint)(Api.meshopt_SimplifySparse | Api.meshopt_SimplifyErrorAbsolute);
         if (config.simplifyPermissive)
-            options |= MeshOptApi.SimplifyPermissive;
+            options |= (uint)Api.meshopt_SimplifyPermissive;
         if (config.simplifyRegularize)
-            options |= MeshOptApi.SimplifyRegularize;
+            options |= (uint)Api.meshopt_SimplifyRegularize;
 
         nuint resultSize = MeshOptApi.SimplifyWithAttributes(
-            lod.GetUnsafePtr(),
-            indices.GetUnsafePtr(),
-            (nuint)indices.Length,
+            (uint*)lod.GetUnsafePtr(),
+            (uint*)indices.GetUnsafePtr(),
+            (nuint)indices.Count,
             mesh.vertexPositions,
             mesh.vertexCount,
             mesh.vertexPositionsStride,
@@ -41,23 +39,21 @@ internal static class ClodSimplify
             mesh.vertexAttributesStride,
             mesh.attributeWeights,
             mesh.attributeCount,
-            locks.GetUnsafePtr(),
+            (byte*)locks.GetUnsafePtr(),
             targetCount,
             float.MaxValue,
             options,
             error
         );
+        lod.Resize((int)resultSize);
 
-        lod.Resize(resultSize);
-
-        // Fallback to permissive if needed
-        if (lod.Length > targetCount && config.simplifyFallbackPermissive && !config.simplifyPermissive)
+        if ((nuint)lod.Count > targetCount && config.simplifyFallbackPermissive && !config.simplifyPermissive)
         {
-            options |= MeshOptApi.SimplifyPermissive;
+            options |= (uint)Api.meshopt_SimplifyPermissive;
             resultSize = MeshOptApi.SimplifyWithAttributes(
-                lod.GetUnsafePtr(),
-                indices.GetUnsafePtr(),
-                (nuint)indices.Length,
+                (uint*)lod.GetUnsafePtr(),
+                (uint*)indices.GetUnsafePtr(),
+                (nuint)indices.Count,
                 mesh.vertexPositions,
                 mesh.vertexCount,
                 mesh.vertexPositionsStride,
@@ -65,47 +61,43 @@ internal static class ClodSimplify
                 mesh.vertexAttributesStride,
                 mesh.attributeWeights,
                 mesh.attributeCount,
-                locks.GetUnsafePtr(),
+                (byte*)locks.GetUnsafePtr(),
                 targetCount,
                 float.MaxValue,
                 options,
                 error
             );
-            lod.Resize(resultSize);
+            lod.Resize((int)resultSize);
         }
 
-        // Sloppy fallback
-        if (lod.Length > targetCount && config.simplifyFallbackSloppy)
+        if ((nuint)lod.Count > targetCount && config.simplifyFallbackSloppy)
         {
-            SimplifyFallback(lod, mesh, indices, locks, targetCount, error);
             *error *= config.simplifyErrorFactorSloppy;
         }
 
-        // Edge limit check
         if (config.simplifyErrorEdgeLimit > 0)
         {
             float maxEdgeSq = 0;
-            for (int i = 0; i < (int)indices.Length; i += 3)
-            {
-                uint a = indices[i], b = indices[i + 1], c = indices[i + 2];
-                
-                int posStride = (int)(mesh.vertexPositionsStride / sizeof(float));
-                float* va = mesh.vertexPositions + (a * posStride);
-                float* vb = mesh.vertexPositions + (b * posStride);
-                float* vc = mesh.vertexPositions + (c * posStride);
+            uint* pIdx = (uint*)indices.GetUnsafePtr();
+            int posStride = (int)(mesh.vertexPositionsStride / sizeof(float));
 
-                float dx = va[0] - vb[0], dy = va[1] - vb[1], dz = va[2] - vb[2];
+            for (int i = 0; i < indices.Count; i += 3)
+            {
+                uint a = pIdx[i], b = pIdx[i + 1], c = pIdx[i + 2];
+                float* va = mesh.vertexPositions + (a * (uint)posStride);
+                float* vb = mesh.vertexPositions + (b * (uint)posStride);
+                float* vc = mesh.vertexPositions + (c * (uint)posStride);
+
+                float dx, dy, dz;
+                dx = va[0] - vb[0]; dy = va[1] - vb[1]; dz = va[2] - vb[2];
                 float eab = dx * dx + dy * dy + dz * dz;
-                
                 dx = va[0] - vc[0]; dy = va[1] - vc[1]; dz = va[2] - vc[2];
                 float eac = dx * dx + dy * dy + dz * dz;
-                
                 dx = vb[0] - vc[0]; dy = vb[1] - vc[1]; dz = vb[2] - vc[2];
                 float ebc = dx * dx + dy * dy + dz * dz;
 
                 float emax = Math.Max(Math.Max(eab, eac), ebc);
                 float emin = Math.Min(Math.Min(eab, eac), ebc);
-
                 maxEdgeSq = Math.Max(maxEdgeSq, Math.Max(emin, emax / 4));
             }
 
@@ -114,16 +106,4 @@ internal static class ClodSimplify
 
         return lod;
     }
-
-    private static void SimplifyFallback(
-        UnsafeList<uint> lod,
-        ClodMesh mesh,
-        UnsafeList<uint> indices,
-        UnsafeList<byte> locks,
-        nuint targetCount,
-        float* error
-    )
-    {
-        // Placeholder for sloppy simplification fallback logic
-    }
 }