[Patch] Fixed swift concurrency test

Author: untoldengine

Sources/UntoldEngine/Mesh/Mesh.swift

@@ -1065,7 +1065,7 @@ public struct Mesh {
             }
 
             let indexBuffer = allocator.newBuffer(primitive.indexData.count, type: .index)
-            primitive.indexData.withUnsafeBytes { rawBuffer in
+            _ = primitive.indexData.withUnsafeBytes { rawBuffer in
                 memcpy(indexBuffer.map().bytes, rawBuffer.baseAddress!, primitive.indexData.count)
             }
 

Sources/UntoldEngine/Systems/GeometryStreamingSystem.swift

@@ -748,7 +748,7 @@ public class GeometryStreamingSystem: @unchecked Sendable {
                 TextureStreamingSystem.shared.shedTextureMemory(
                     cameraPosition: effectiveCameraPosition, maxEntities: 4
                 )
-                evictLRU(cameraPosition: effectiveCameraPosition, maxEvictions: 8)
+                _ = evictLRU(cameraPosition: effectiveCameraPosition, maxEvictions: 8)
             }
 
             tileLoadCandidates.sort { lhs, rhs in

Sources/UntoldEngine/Systems/RegistrationSystem.swift

@@ -12,7 +12,7 @@
 import CShaderTypes
 import Foundation
 import MetalKit
-import ModelIO
+@preconcurrency import ModelIO
 
 @inline(__always)
 private func enforceRegistrationMainActor() {
@@ -50,6 +50,10 @@ private final class ResumeOnce: @unchecked Sendable {
     }
 }
 
+private struct SendableMDLAssetBox: @unchecked Sendable {
+    let asset: MDLAsset
+}
+
 private final class RegistrationRuntimeState: @unchecked Sendable {
     let lock = NSLock()
     var pendingDestroyCompletions: [() -> Void] = []
@@ -1626,10 +1630,10 @@ public func setEntityMeshAsync(
             Logger.log(message: "[Streaming] '\(filename)': loadTextures() start")
             let textureLoadOK = await withCheckedContinuation { (cont: CheckedContinuation<Bool, Never>) in
                 let once = ResumeOnce()
-                let assetRef = assetData.asset
+                let assetRef = SendableMDLAssetBox(asset: assetData.asset)
                 let nameForLog = filename
                 DispatchQueue.global(qos: .userInitiated).async {
-                    assetRef.loadTextures()
+                    assetRef.asset.loadTextures()
                     once.callOnce { cont.resume(returning: true) }
                 }
                 DispatchQueue.global().asyncAfter(deadline: .now() + 15.0) {