Merge branch 'main' into ly-as-sdk/LYN-2948

# Conflicts:
#	CMakeLists.txt
#	Code/Tools/ProjectManager/Source/GemCatalog/GemInfo.h
#	Gems/AtomLyIntegration/AtomViewportDisplayInfo/gem.json
#	cmake/LYWrappers.cmake
#	cmake/SettingsRegistry.cmake
#	scripts/o3de/tests/unit_test_current_project.py

Code/Framework/AzFramework/AzFramework/Application/Application.cpp

@@ -679,8 +679,6 @@ namespace AzFramework
         {
             auto fileIoBase = m_archiveFileIO.get();
             // Set up the default file aliases based on the settings registry
-            fileIoBase->SetAlias("@assets@", "");
-            fileIoBase->SetAlias("@root@", GetEngineRoot());
             fileIoBase->SetAlias("@engroot@", GetEngineRoot());
             fileIoBase->SetAlias("@projectroot@", GetEngineRoot());
             fileIoBase->SetAlias("@exefolder@", GetExecutableFolder());
@@ -694,8 +692,8 @@ namespace AzFramework
                 pathAliases.clear();
                 if (m_settingsRegistry->Get(pathAliases.Native(), AZ::SettingsRegistryMergeUtils::FilePathKey_CacheRootFolder))
                 {
-                    fileIoBase->SetAlias("@projectplatformcache@", pathAliases.c_str());
                     fileIoBase->SetAlias("@assets@", pathAliases.c_str());
+                    fileIoBase->SetAlias("@projectplatformcache@", pathAliases.c_str());
                     fileIoBase->SetAlias("@root@", pathAliases.c_str()); // Deprecated Use @projectplatformcache@
                 }
                 pathAliases.clear();

Code/Framework/AzFramework/AzFramework/Asset/AssetProcessorMessages.cpp

@@ -308,6 +308,56 @@ namespace AzFramework
             }
         }
 
+        //---------------------------------------------------------------------
+        GenerateRelativeSourcePathRequest::GenerateRelativeSourcePathRequest(const AZ::OSString& sourcePath)
+        {
+            AZ_Assert(!sourcePath.empty(), "GenerateRelativeSourcePathRequest: asset path is empty");
+            m_sourcePath = sourcePath;
+        }
+
+        unsigned int GenerateRelativeSourcePathRequest::GetMessageType() const
+        {
+            return MessageType;
+        }
+
+        void GenerateRelativeSourcePathRequest::Reflect(AZ::ReflectContext* context)
+        {
+            auto serialize = azrtti_cast<AZ::SerializeContext*>(context);
+            if (serialize)
+            {
+                serialize->Class<GenerateRelativeSourcePathRequest, BaseAssetProcessorMessage>()
+                    ->Version(1)
+                    ->Field("SourcePath", &GenerateRelativeSourcePathRequest::m_sourcePath);
+            }
+        }
+
+        //---------------------------------------------------------------------
+        GenerateRelativeSourcePathResponse::GenerateRelativeSourcePathResponse(
+            bool resolved, const AZ::OSString& relativeSourcePath, const AZ::OSString& rootFolder)
+        {
+            m_relativeSourcePath = relativeSourcePath;
+            m_resolved = resolved;
+            m_rootFolder = rootFolder;
+        }
+
+        unsigned int GenerateRelativeSourcePathResponse::GetMessageType() const
+        {
+            return GenerateRelativeSourcePathRequest::MessageType;
+        }
+
+        void GenerateRelativeSourcePathResponse::Reflect(AZ::ReflectContext* context)
+        {
+            auto serialize = azrtti_cast<AZ::SerializeContext*>(context);
+            if (serialize)
+            {
+                serialize->Class<GenerateRelativeSourcePathResponse, BaseAssetProcessorMessage>()
+                    ->Version(1)
+                    ->Field("RelativeSourcePath", &GenerateRelativeSourcePathResponse::m_relativeSourcePath)
+                    ->Field("RootFolder", &GenerateRelativeSourcePathResponse::m_rootFolder)
+                    ->Field("Resolved", &GenerateRelativeSourcePathResponse::m_resolved);
+            }
+        }
+
         //---------------------------------------------------------------------
         GetFullSourcePathFromRelativeProductPathRequest::GetFullSourcePathFromRelativeProductPathRequest(const AZ::OSString& relativeProductPath)
         {

Code/Framework/AzFramework/AzFramework/Asset/AssetProcessorMessages.h

@@ -288,6 +288,45 @@ namespace AzFramework
             bool m_resolved;
         };
 
+        //////////////////////////////////////////////////////////////////////////
+        class GenerateRelativeSourcePathRequest : public BaseAssetProcessorMessage
+        {
+        public:
+            AZ_CLASS_ALLOCATOR(GenerateRelativeSourcePathRequest, AZ::OSAllocator, 0);
+            AZ_RTTI(GenerateRelativeSourcePathRequest, "{B3865033-F5A3-4749-8147-7B1AB04D5F6D}",
+                BaseAssetProcessorMessage);
+            static void Reflect(AZ::ReflectContext* context);
+
+            // For people that are debugging the network messages and just see MessageType as a value,
+            // the CRC value below is 739777771 (0x2C181CEB)
+            static constexpr unsigned int MessageType =
+                AZ_CRC_CE("AssetSystem::GenerateRelativeSourcePathRequest");
+
+            GenerateRelativeSourcePathRequest() = default;
+            GenerateRelativeSourcePathRequest(const AZ::OSString& sourcePath);
+            unsigned int GetMessageType() const override;
+
+            AZ::OSString m_sourcePath;
+        };
+
+        class GenerateRelativeSourcePathResponse : public BaseAssetProcessorMessage
+        {
+        public:
+            AZ_CLASS_ALLOCATOR(GenerateRelativeSourcePathResponse, AZ::OSAllocator, 0);
+            AZ_RTTI(GenerateRelativeSourcePathResponse, "{938D33DB-C8F6-4FA4-BC81-2F139A9BE1D7}",
+                BaseAssetProcessorMessage);
+            static void Reflect(AZ::ReflectContext* context);
+
+            GenerateRelativeSourcePathResponse() = default;
+            GenerateRelativeSourcePathResponse(
+                bool resolved, const AZ::OSString& relativeSourcePath, const AZ::OSString& rootFolder);
+            unsigned int GetMessageType() const override;
+
+            AZ::OSString m_relativeSourcePath;
+            AZ::OSString m_rootFolder; ///< This is the folder it was found in (the watched/scanned folder, such as gems /assets/ folder)
+            bool m_resolved;
+        };
+
         //////////////////////////////////////////////////////////////////////////
         class GetFullSourcePathFromRelativeProductPathRequest
             : public BaseAssetProcessorMessage

Code/Framework/AzFramework/AzFramework/Asset/AssetSystemComponent.cpp

@@ -202,6 +202,7 @@ namespace AzFramework
             // Requests
             GetUnresolvedDependencyCountsRequest::Reflect(context);
             GetRelativeProductPathFromFullSourceOrProductPathRequest::Reflect(context);
+            GenerateRelativeSourcePathRequest::Reflect(context);
             GetFullSourcePathFromRelativeProductPathRequest::Reflect(context);
             SourceAssetInfoRequest::Reflect(context);
             AssetInfoRequest::Reflect(context);
@@ -234,6 +235,7 @@ namespace AzFramework
             // Responses
             GetUnresolvedDependencyCountsResponse::Reflect(context);
             GetRelativeProductPathFromFullSourceOrProductPathResponse::Reflect(context);
+            GenerateRelativeSourcePathResponse::Reflect(context);
             GetFullSourcePathFromRelativeProductPathResponse::Reflect(context);
             SourceAssetInfoResponse::Reflect(context);
             AssetInfoResponse::Reflect(context);

Code/Framework/AzFramework/AzFramework/ProjectManager/ProjectManager.cpp

@@ -46,7 +46,6 @@ namespace AzFramework::ProjectManager
             // Store the Command line to the Setting Registry
             AZ::SettingsRegistryImpl settingsRegistry;
             AZ::SettingsRegistryMergeUtils::StoreCommandLineToRegistry(settingsRegistry, commandLine);
-            AZ::SettingsRegistryMergeUtils::MergeSettingsToRegistry_Bootstrap(settingsRegistry);
             AZ::SettingsRegistryMergeUtils::MergeSettingsToRegistry_O3deUserRegistry(settingsRegistry, AZ_TRAIT_OS_PLATFORM_CODENAME, {});
             // Retrieve Command Line from Settings Registry, it may have been updated by the call to FindEngineRoot()
             // in MergeSettingstoRegistry_ConfigFile

Code/Framework/AzFramework/AzFramework/Spawnable/Spawnable.h

@@ -19,10 +19,13 @@
 #include <AzCore/std/smart_ptr/unique_ptr.h>
 #include <AzFramework/Spawnable/SpawnableMetaData.h>
 
-namespace AzFramework
+namespace AZ
 {
     class ReflectContext;
+}
 
+namespace AzFramework
+{
     class Spawnable final
         : public AZ::Data::AssetData
     {

Code/Framework/AzFramework/AzFramework/Spawnable/SpawnableEntitiesInterface.cpp

@@ -14,6 +14,10 @@
 
 namespace AzFramework
 {
+    //
+    // SpawnableEntityContainerView
+    //
+
     SpawnableEntityContainerView::SpawnableEntityContainerView(AZ::Entity** begin, size_t length)
         : m_begin(begin)
         , m_end(begin + length)
@@ -52,6 +56,9 @@ namespace AzFramework
     }
 
 
+    //
+    // SpawnableConstEntityContainerView
+    //
 
     SpawnableConstEntityContainerView::SpawnableConstEntityContainerView(AZ::Entity** begin, size_t length)
         : m_begin(begin)
@@ -91,6 +98,136 @@ namespace AzFramework
     }
 
 
+    //
+    // SpawnableIndexEntityPair
+    //
+
+    SpawnableIndexEntityPair::SpawnableIndexEntityPair(AZ::Entity** entityIterator, size_t* indexIterator)
+        : m_entity(entityIterator)
+        , m_index(indexIterator)
+    {
+    }
+
+    AZ::Entity* SpawnableIndexEntityPair::GetEntity()
+    {
+        return *m_entity;
+    }
+
+    const AZ::Entity* SpawnableIndexEntityPair::GetEntity() const
+    {
+        return *m_entity;
+    }
+
+    size_t SpawnableIndexEntityPair::GetIndex() const
+    {
+        return *m_index;
+    }
+
+    //
+    // SpawnableIndexEntityIterator
+    //
+
+    SpawnableIndexEntityIterator::SpawnableIndexEntityIterator(AZ::Entity** entityIterator, size_t* indexIterator)
+        : m_value(entityIterator, indexIterator)
+    {
+    }
+
+    SpawnableIndexEntityIterator& SpawnableIndexEntityIterator::operator++()
+    {
+        ++m_value.m_entity;
+        ++m_value.m_index;
+        return *this;
+    }
+
+    SpawnableIndexEntityIterator SpawnableIndexEntityIterator::operator++(int)
+    {
+        SpawnableIndexEntityIterator result = *this;
+        ++m_value.m_entity;
+        ++m_value.m_index;
+        return result;
+    }
+
+    SpawnableIndexEntityIterator& SpawnableIndexEntityIterator::operator--()
+    {
+        --m_value.m_entity;
+        --m_value.m_index;
+        return *this;
+    }
+
+    SpawnableIndexEntityIterator SpawnableIndexEntityIterator::operator--(int)
+    {
+        SpawnableIndexEntityIterator result = *this;
+        --m_value.m_entity;
+        --m_value.m_index;
+        return result;
+    }
+
+    bool SpawnableIndexEntityIterator::operator==(const SpawnableIndexEntityIterator& rhs)
+    {
+        return m_value.m_entity == rhs.m_value.m_entity && m_value.m_index == rhs.m_value.m_index;
+    }
+
+    bool SpawnableIndexEntityIterator::operator!=(const SpawnableIndexEntityIterator& rhs)
+    {
+        return m_value.m_entity != rhs.m_value.m_entity || m_value.m_index != rhs.m_value.m_index;
+    }
+
+    SpawnableIndexEntityPair& SpawnableIndexEntityIterator::operator*()
+    {
+        return m_value;
+    }
+
+    const SpawnableIndexEntityPair& SpawnableIndexEntityIterator::operator*() const
+    {
+        return m_value;
+    }
+
+    SpawnableIndexEntityPair* SpawnableIndexEntityIterator::operator->()
+    {
+        return &m_value;
+    }
+
+    const SpawnableIndexEntityPair* SpawnableIndexEntityIterator::operator->() const
+    {
+        return &m_value;
+    }
+
+
+    //
+    // SpawnableConstIndexEntityContainerView
+    //
+
+    SpawnableConstIndexEntityContainerView::SpawnableConstIndexEntityContainerView(
+        AZ::Entity** beginEntity, size_t* beginIndices, size_t length)
+        : m_begin(beginEntity, beginIndices)
+        , m_end(beginEntity + length, beginIndices + length)
+    {
+    }
+
+    const SpawnableIndexEntityIterator& SpawnableConstIndexEntityContainerView::begin()
+    {
+        return m_begin;
+    }
+
+    const SpawnableIndexEntityIterator& SpawnableConstIndexEntityContainerView::end()
+    {
+        return m_end;
+    }
+
+    const SpawnableIndexEntityIterator& SpawnableConstIndexEntityContainerView::cbegin()
+    {
+        return m_begin;
+    }
+
+    const SpawnableIndexEntityIterator& SpawnableConstIndexEntityContainerView::cend()
+    {
+        return m_end;
+    }
+
+
+    //
+    // EntitySpawnTicket
+    //
 
     EntitySpawnTicket::EntitySpawnTicket(EntitySpawnTicket&& rhs)
         : m_payload(rhs.m_payload)

Code/Framework/AzFramework/AzFramework/Spawnable/SpawnableEntitiesInterface.h

@@ -58,6 +58,72 @@ namespace AzFramework
         AZ::Entity** m_end;
     };
 
+    class SpawnableIndexEntityPair
+    {
+    public:
+        friend class SpawnableIndexEntityIterator;
+
+        AZ::Entity* GetEntity();
+        const AZ::Entity* GetEntity() const;
+        size_t GetIndex() const;
+
+    private:
+        SpawnableIndexEntityPair() = default;
+        SpawnableIndexEntityPair(const SpawnableIndexEntityPair&) = default;
+        SpawnableIndexEntityPair(SpawnableIndexEntityPair&&) = default;
+        SpawnableIndexEntityPair(AZ::Entity** entityIterator, size_t* indexIterator);
+
+        SpawnableIndexEntityPair& operator=(const SpawnableIndexEntityPair&) = default;
+        SpawnableIndexEntityPair& operator=(SpawnableIndexEntityPair&&) = default;
+
+        AZ::Entity** m_entity { nullptr };
+        size_t* m_index { nullptr };
+    };
+
+    class SpawnableIndexEntityIterator
+    {
+    public:
+        // Limited to bidirectional iterator as there's no use case for extending it further, but can be extended if a use case is found.
+        using iterator_category = AZStd::bidirectional_iterator_tag;
+        using value_type = SpawnableIndexEntityPair;
+        using difference_type = size_t;
+        using pointer = SpawnableIndexEntityPair*;
+        using reference = SpawnableIndexEntityPair&;
+
+        SpawnableIndexEntityIterator(AZ::Entity** entityIterator, size_t* indexIterator);
+
+        SpawnableIndexEntityIterator& operator++();
+        SpawnableIndexEntityIterator operator++(int);
+        SpawnableIndexEntityIterator& operator--();
+        SpawnableIndexEntityIterator operator--(int);
+
+        bool operator==(const SpawnableIndexEntityIterator& rhs);
+        bool operator!=(const SpawnableIndexEntityIterator& rhs);
+
+        SpawnableIndexEntityPair& operator*();
+        const SpawnableIndexEntityPair& operator*() const;
+        SpawnableIndexEntityPair* operator->();
+        const SpawnableIndexEntityPair* operator->() const;
+
+    private:
+        SpawnableIndexEntityPair m_value;
+    };
+
+    class SpawnableConstIndexEntityContainerView
+    {
+    public:
+        SpawnableConstIndexEntityContainerView(AZ::Entity** beginEntity, size_t* beginIndices, size_t length);
+
+        const SpawnableIndexEntityIterator& begin();
+        const SpawnableIndexEntityIterator& end();
+        const SpawnableIndexEntityIterator& cbegin();
+        const SpawnableIndexEntityIterator& cend();
+
+    private:
+        SpawnableIndexEntityIterator m_begin;
+        SpawnableIndexEntityIterator m_end;
+    };
+
     //! Requests to the SpawnableEntitiesInterface require a ticket with a valid spawnable that be used as a template. A ticket can
     //! be reused for multiple calls on the same spawnable and is safe to use by multiple threads at the same time. Entities created
     //! from the spawnable may be tracked by the ticket and so using the same ticket is needed to despawn the exact entities created
@@ -88,6 +154,7 @@ namespace AzFramework
     using EntityDespawnCallback = AZStd::function<void(EntitySpawnTicket&)>;
     using ReloadSpawnableCallback = AZStd::function<void(EntitySpawnTicket&, SpawnableConstEntityContainerView)>;
     using ListEntitiesCallback = AZStd::function<void(EntitySpawnTicket&, SpawnableConstEntityContainerView)>;
+    using ListIndicesEntitiesCallback = AZStd::function<void(EntitySpawnTicket&, SpawnableConstIndexEntityContainerView)>;
     using ClaimEntitiesCallback = AZStd::function<void(EntitySpawnTicket&, SpawnableEntityContainerView)>;
     using BarrierCallback = AZStd::function<void(EntitySpawnTicket&)>;
 
@@ -140,6 +207,15 @@ namespace AzFramework
         //! @param ticket Only the entities associated with this ticket will be listed.
         //! @param listCallback Required callback that will be called to list the entities on.
         virtual void ListEntities(EntitySpawnTicket& ticket, ListEntitiesCallback listCallback) = 0;
+        //! List all entities that are spawned using this ticket with their spawnable index.
+        //!     Spawnables contain a flat list of entities, which are used as templates to spawn entities from. For every spawned entity
+        //!     the index of the entity in the spawnable that was used as a template is stored. This version of ListEntities will return
+        //!     both the entities and this index. The index can be used with SpawnEntities to create the same entities again. Note that
+        //!     the same index may appear multiple times as there are no restriction on how many instance of a specific entity can be
+        //!     created.
+        //! @param ticket Only the entities associated with this ticket will be listed.
+        //! @param listCallback Required callback that will be called to list the entities and indices on.
+        virtual void ListIndicesAndEntities(EntitySpawnTicket& ticket, ListIndicesEntitiesCallback listCallback) = 0;
         //! Claim all entities that are spawned using this ticket. Ownership of the entities is transferred from the ticket to the
         //!     caller through the callback. After this call the ticket will have no entities associated with it. The caller of
         //!     this function will need to manage the entities after this call.

Code/Framework/AzFramework/AzFramework/Spawnable/SpawnableEntitiesManager.cpp

@@ -25,6 +25,8 @@ namespace AzFramework
     void SpawnableEntitiesManager::SpawnAllEntities(EntitySpawnTicket& ticket, EntityPreInsertionCallback preInsertionCallback,
         EntitySpawnCallback completionCallback)
     {
+        AZ_Assert(ticket.IsValid(), "Ticket provided to SpawnAllEntities hasn't been initialized.");
+
         SpawnAllEntitiesCommand queueEntry;
         queueEntry.m_ticket = &ticket;
         queueEntry.m_completionCallback = AZStd::move(completionCallback);
@@ -40,6 +42,8 @@ namespace AzFramework
         EntitySpawnTicket& ticket, AZStd::vector<size_t> entityIndices,
         EntityPreInsertionCallback preInsertionCallback, EntitySpawnCallback completionCallback)
     {
+        AZ_Assert(ticket.IsValid(), "Ticket provided to SpawnEntities hasn't been initialized.");
+
         SpawnEntitiesCommand queueEntry;
         queueEntry.m_ticket = &ticket;
         queueEntry.m_entityIndices = AZStd::move(entityIndices);
@@ -54,6 +58,8 @@ namespace AzFramework
 
     void SpawnableEntitiesManager::DespawnAllEntities(EntitySpawnTicket& ticket, EntityDespawnCallback completionCallback)
     {
+        AZ_Assert(ticket.IsValid(), "Ticket provided to DespawnAllEntities hasn't been initialized.");
+
         DespawnAllEntitiesCommand queueEntry;
         queueEntry.m_ticket = &ticket;
         queueEntry.m_completionCallback = AZStd::move(completionCallback);
@@ -67,6 +73,8 @@ namespace AzFramework
     void SpawnableEntitiesManager::ReloadSpawnable(EntitySpawnTicket& ticket, AZ::Data::Asset<Spawnable> spawnable,
         ReloadSpawnableCallback completionCallback)
     {
+        AZ_Assert(ticket.IsValid(), "Ticket provided to ReloadSpawnable hasn't been initialized.");
+
         ReloadSpawnableCommand queueEntry;
         queueEntry.m_ticket = &ticket;
         queueEntry.m_spawnable = AZStd::move(spawnable);
@@ -81,6 +89,7 @@ namespace AzFramework
     void SpawnableEntitiesManager::ListEntities(EntitySpawnTicket& ticket, ListEntitiesCallback listCallback)
     {
         AZ_Assert(listCallback, "ListEntities called on spawnable entities without a valid callback to use.");
+        AZ_Assert(ticket.IsValid(), "Ticket provided to ListEntities hasn't been initialized.");
 
         ListEntitiesCommand queueEntry;
         queueEntry.m_ticket = &ticket;
@@ -92,9 +101,25 @@ namespace AzFramework
         }
     }
 
+    void SpawnableEntitiesManager::ListIndicesAndEntities(EntitySpawnTicket& ticket, ListIndicesEntitiesCallback listCallback)
+    {
+        AZ_Assert(listCallback, "ListEntities called on spawnable entities without a valid callback to use.");
+        AZ_Assert(ticket.IsValid(), "Ticket provided to ListEntities hasn't been initialized.");
+
+        ListIndicesEntitiesCommand queueEntry;
+        queueEntry.m_ticket = &ticket;
+        queueEntry.m_listCallback = AZStd::move(listCallback);
+        {
+            AZStd::scoped_lock queueLock(m_pendingRequestQueueMutex);
+            queueEntry.m_ticketId = GetTicketPayload<Ticket>(ticket).m_nextTicketId++;
+            m_pendingRequestQueue.push(AZStd::move(queueEntry));
+        }
+    }
+
     void SpawnableEntitiesManager::ClaimEntities(EntitySpawnTicket& ticket, ClaimEntitiesCallback listCallback)
     {
         AZ_Assert(listCallback, "ClaimEntities called on spawnable entities without a valid callback to use.");
+        AZ_Assert(ticket.IsValid(), "Ticket provided to ClaimEntities hasn't been initialized.");
 
         ClaimEntitiesCommand queueEntry;
         queueEntry.m_ticket = &ticket;
@@ -109,6 +134,7 @@ namespace AzFramework
     void SpawnableEntitiesManager::Barrier(EntitySpawnTicket& ticket, BarrierCallback completionCallback)
     {
         AZ_Assert(completionCallback, "Barrier on spawnable entities called without a valid callback to use.");
+        AZ_Assert(ticket.IsValid(), "Ticket provided to Barrier hasn't been initialized.");
 
         BarrierCommand queueEntry;
         queueEntry.m_ticket = &ticket;
@@ -499,6 +525,27 @@ namespace AzFramework
         }
     }
 
+    bool SpawnableEntitiesManager::ProcessRequest(ListIndicesEntitiesCommand& request, [[maybe_unused]] AZ::SerializeContext& serializeContext)
+    {
+        Ticket& ticket = GetTicketPayload<Ticket>(*request.m_ticket);
+        if (request.m_ticketId == ticket.m_currentTicketId)
+        {
+            AZ_Assert(
+                ticket.m_spawnedEntities.size() == ticket.m_spawnedEntityIndices.size(),
+                "Entities and indices on spawnable ticket have gone out of sync.");
+            request.m_listCallback(
+                *request.m_ticket,
+                SpawnableConstIndexEntityContainerView(
+                    ticket.m_spawnedEntities.begin(), ticket.m_spawnedEntityIndices.begin(), ticket.m_spawnedEntities.size()));
+            ticket.m_currentTicketId++;
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
     bool SpawnableEntitiesManager::ProcessRequest(ClaimEntitiesCommand& request, [[maybe_unused]] AZ::SerializeContext& serializeContext)
     {
         Ticket& ticket = GetTicketPayload<Ticket>(*request.m_ticket);

Code/Framework/AzFramework/AzFramework/Spawnable/SpawnableEntitiesManager.h

@@ -36,6 +36,7 @@ namespace AzFramework
     {
     public:
         AZ_RTTI(AzFramework::SpawnableEntitiesManager, "{6E14333F-128C-464C-94CA-A63B05A5E51C}");
+        AZ_CLASS_ALLOCATOR(SpawnableEntitiesManager, AZ::SystemAllocator, 0);
 
         enum class CommandQueueStatus : bool
         {
@@ -58,6 +59,7 @@ namespace AzFramework
             ReloadSpawnableCallback completionCallback = {}) override;
 
         void ListEntities(EntitySpawnTicket& ticket, ListEntitiesCallback listCallback) override;
+        void ListIndicesAndEntities(EntitySpawnTicket& ticket, ListIndicesEntitiesCallback listCallback) override;
         void ClaimEntities(EntitySpawnTicket& ticket, ClaimEntitiesCallback listCallback) override;
 
         void Barrier(EntitySpawnTicket& spawnInfo, BarrierCallback completionCallback) override;
@@ -123,6 +125,12 @@ namespace AzFramework
             EntitySpawnTicket* m_ticket;
             uint32_t m_ticketId;
         };
+        struct ListIndicesEntitiesCommand
+        {
+            ListIndicesEntitiesCallback m_listCallback;
+            EntitySpawnTicket* m_ticket;
+            uint32_t m_ticketId;
+        };
         struct ClaimEntitiesCommand
         {
             ClaimEntitiesCallback m_listCallback;
@@ -141,8 +149,9 @@ namespace AzFramework
             uint32_t m_ticketId;
         };
 
-        using Requests = AZStd::variant<SpawnAllEntitiesCommand, SpawnEntitiesCommand, DespawnAllEntitiesCommand, ReloadSpawnableCommand,
-            ListEntitiesCommand, ClaimEntitiesCommand, BarrierCommand, DestroyTicketCommand>;
+        using Requests = AZStd::variant<
+            SpawnAllEntitiesCommand, SpawnEntitiesCommand, DespawnAllEntitiesCommand, ReloadSpawnableCommand, ListEntitiesCommand,
+            ListIndicesEntitiesCommand, ClaimEntitiesCommand, BarrierCommand, DestroyTicketCommand>;
 
         AZ::Entity* SpawnSingleEntity(const AZ::Entity& entityTemplate,
             AZ::SerializeContext& serializeContext);
@@ -155,6 +164,7 @@ namespace AzFramework
         bool ProcessRequest(DespawnAllEntitiesCommand& request, AZ::SerializeContext& serializeContext);
         bool ProcessRequest(ReloadSpawnableCommand& request, AZ::SerializeContext& serializeContext);
         bool ProcessRequest(ListEntitiesCommand& request, AZ::SerializeContext& serializeContext);
+        bool ProcessRequest(ListIndicesEntitiesCommand& request, AZ::SerializeContext& serializeContext);
         bool ProcessRequest(ClaimEntitiesCommand& request, AZ::SerializeContext& serializeContext);
         bool ProcessRequest(BarrierCommand& request, AZ::SerializeContext& serializeContext);
         bool ProcessRequest(DestroyTicketCommand& request, AZ::SerializeContext& serializeContext);