Expose Texture::NumLayers via NativeEngine.getTextureLayerCount

Babylon.js side wraps native textures with engine.wrapNativeTexture and
sets InternalTexture properties from the engine bindings. Today the
binding only exposes width and height, so consumers cannot detect that
a wrapped texture is a Texture2DArray and InternalTexture.is2DArray /
.depth stay at their defaults.

Add getTextureLayerCount returning Texture::NumLayers so Babylon.js can
populate is2DArray and depth on the wrapped InternalTexture
automatically, without the host having to thread the layer count
through its own bridge.

[Created by Copilot on behalf of @bghgary]

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bghgary

Plugins/NativeEngine/Source/NativeEngine.cpp

@@ -716,6 +716,7 @@ namespace Babylon
                 InstanceMethod("loadCubeTextureWithMips", &NativeEngine::LoadCubeTextureWithMips),
                 InstanceMethod("getTextureWidth", &NativeEngine::GetTextureWidth),
                 InstanceMethod("getTextureHeight", &NativeEngine::GetTextureHeight),
+                InstanceMethod("getTextureLayerCount", &NativeEngine::GetTextureLayerCount),
                 InstanceMethod("deleteTexture", &NativeEngine::DeleteTexture),
                 InstanceMethod("readTexture", &NativeEngine::ReadTexture),
 
@@ -1541,6 +1542,12 @@ namespace Babylon
         return Napi::Value::From(info.Env(), texture->Height());
     }
 
+    Napi::Value NativeEngine::GetTextureLayerCount(const Napi::CallbackInfo& info)
+    {
+        const Graphics::Texture* texture = info[0].As<Napi::Pointer<Graphics::Texture>>().Get();
+        return Napi::Value::From(info.Env(), texture->NumLayers());
+    }
+
     void NativeEngine::SetTextureSampling(NativeDataStream::Reader& data)
     {
         auto& texture = *data.ReadPointer<Graphics::Texture>();

Plugins/NativeEngine/Source/NativeEngine.h

@@ -97,6 +97,7 @@ namespace Babylon
         void LoadCubeTextureWithMips(const Napi::CallbackInfo& info);
         Napi::Value GetTextureWidth(const Napi::CallbackInfo& info);
         Napi::Value GetTextureHeight(const Napi::CallbackInfo& info);
+        Napi::Value GetTextureLayerCount(const Napi::CallbackInfo& info);
         void SetTextureSampling(NativeDataStream::Reader& data);
         void SetTextureWrapMode(NativeDataStream::Reader& data);
         void SetTextureAnisotropicLevel(NativeDataStream::Reader& data);