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Added ability to convert multiply-nested slices (#1239)

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* Addressed feedback from previous PR
* Change missing entity aliases to be deterministic.
When converting slices, this helps produce the same results on multiple reconversions of the same data.
* Exposed the asset filter callback.
This allows the slice converter to specifically load nested slices as opposed to not loading *any* referenced assets.
* Added support for multiply-nested slice instance conversion.
monroegm-disable-blank-issue-2
Mike Balfour 5 years ago committed by GitHub
parent 1946561b8d
commit 86136ddfa6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 223 additions and 72 deletions
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4
Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/Instance/InstanceEntityIdMapper.cpp
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@ -154,7 +154,7 @@ namespace AzToolsFramework
InstanceOptionalReference owningInstanceReference = m_storingInstance->m_instanceEntityMapper->FindOwningInstance(entityId);
// Start with an empty alias to build out our reference path
// If we can't resolve this id we'll return a random new alias instead of a reference path
// If we can't resolve this id we'll return a new alias based on the entity ID instead of a reference path
AliasPath relativeEntityAliasPath;
if (!owningInstanceReference)
{
@ -162,7 +162,7 @@ namespace AzToolsFramework
"Prefab - EntityIdMapper: Entity with Id %s has no registered owning instance",
entityId.ToString().c_str());
return Instance::GenerateEntityAlias();
return AZStd::string::format("Entity_%s", entityId.ToString().c_str());
}
Instance* owningInstance = &(owningInstanceReference->get());

2
Code/Tools/SerializeContextTools/Application.cpp
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@ -35,7 +35,7 @@ namespace AZ
Application::Application(int argc, char** argv)
: AzToolsFramework::ToolsApplication(&argc, &argv)
{
// We need a specialized variant of EditorEntityContextCompnent for the SliceConverter, so we register the descriptor here.
// We need a specialized variant of EditorEntityContextComponent for the SliceConverter, so we register the descriptor here.
RegisterComponentDescriptor(AzToolsFramework::SliceConverterEditorEntityContextComponent::CreateDescriptor());
AZ::IO::FixedMaxPath projectPath = AZ::Utils::GetProjectPath();

241
Code/Tools/SerializeContextTools/SliceConverter.cpp
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@ -128,8 +128,7 @@ namespace AZ
return result;
}
bool SliceConverter::ConvertSliceFile(
AZ::SerializeContext* serializeContext, const AZStd::string& slicePath, bool isDryRun)
bool SliceConverter::ConvertSliceFile(AZ::SerializeContext* serializeContext, const AZStd::string& slicePath, bool isDryRun)
{
/* To convert a slice file, we read the input file in via ObjectStream, then use the "class ready" callback to convert
* the data in memory to a Prefab.
@ -177,11 +176,22 @@ namespace AZ
}
AZ::Entity* rootEntity = reinterpret_cast<AZ::Entity*>(classPtr);
return ConvertSliceToPrefab(context, outputPath, isDryRun, rootEntity);
bool convertResult = ConvertSliceToPrefab(context, outputPath, isDryRun, rootEntity);
// Clear out the references to any nested slices so that the nested assets get unloaded correctly at the end of
// the conversion.
ClearSliceAssetReferences(rootEntity);
return convertResult;
};
// Read in the slice file and call the callback on completion to convert the read-in slice to a prefab.
if (!Utilities::InspectSerializedFile(inputPath.c_str(), serializeContext, callback))
// This will also load dependent slice assets, but no other dependent asset types.
// Since we're not actually initializing any of the entities, we don't need any of the non-slice assets to be loaded.
if (!Utilities::InspectSerializedFile(
inputPath.c_str(), serializeContext, callback,
[](const AZ::Data::AssetFilterInfo& filterInfo)
{
return (filterInfo.m_assetType == azrtti_typeid<AZ::SliceAsset>());
}))
{
AZ_Warning("Convert-Slice", false, "Failed to load '%s'. File may not contain an object stream.", inputPath.c_str());
result = false;
@ -256,7 +266,7 @@ namespace AZ
for (auto& alias : entityAliases)
{
auto id = sourceInstance->GetEntityId(alias);
auto result = m_aliasIdMapper.emplace(TemplateEntityIdPair(templateId, id), alias);
auto result = m_aliasIdMapper.emplace(id, SliceEntityMappingInfo(templateId, alias));
if (!result.second)
{
AZ_Printf("Convert-Slice", " Duplicate entity alias -> entity id entries found, conversion may not be successful.\n");
@ -342,10 +352,9 @@ namespace AZ
// For each nested slice, convert it.
for (auto& slice : sliceList)
{
// Get the nested slice asset
// Get the nested slice asset. These should already be preloaded due to loading the root asset.
auto sliceAsset = slice.GetSliceAsset();
sliceAsset.QueueLoad();
sliceAsset.BlockUntilLoadComplete();
AZ_Assert(sliceAsset.IsReady(), "slice asset hasn't been loaded yet!");
// The slice list gives us asset IDs, and we need to get to the source path. So first we get the asset path from the ID,
// then we get the source path from the asset path.
@ -429,6 +438,28 @@ namespace AZ
auto instanceToTemplateInterface = AZ::Interface<AzToolsFramework::Prefab::InstanceToTemplateInterface>::Get();
auto prefabSystemComponentInterface = AZ::Interface<AzToolsFramework::Prefab::PrefabSystemComponentInterface>::Get();
// When creating the new instance, we would like to have deterministic instance aliases. Prefabs that depend on this one
// will have patches that reference the alias, so if we reconvert this slice a second time, we would like it to produce
// the same results. To get a deterministic and unique alias, we rely on the slice instance. The slice instance contains
// a map of slice entity IDs to unique instance entity IDs. We'll just consistently use the first entry in the map as the
// unique instance ID.
AZStd::string instanceAlias;
auto entityIdMap = instance.GetEntityIdMap();
if (!entityIdMap.empty())
{
instanceAlias = AZStd::string::format("Instance_%s", entityIdMap.begin()->second.ToString().c_str());
}
else
{
instanceAlias = AZStd::string::format("Instance_%s", AZ::Entity::MakeId().ToString().c_str());
}
// Before processing any further, save off all the known entity IDs from this instance and how they map back to the base
// nested prefab that they've come from (i.e. this one). As we proceed up the chain of nesting, this will build out a
// hierarchical list of owning instances for each entity that we can trace upwards to know where to add the entity into
// our nested prefab instance.
UpdateSliceEntityInstanceMappings(instance.GetEntityIdToBaseMap(), instanceAlias);
// Create a new unmodified prefab Instance for the nested slice instance.
auto nestedInstance = AZStd::make_unique<AzToolsFramework::Prefab::Instance>();
AzToolsFramework::Prefab::Instance::EntityList newEntities;
@ -465,62 +496,125 @@ namespace AZ
auto instantiated =
dataPatch.Apply(&sourceObjects, dependentSlice->GetSerializeContext(), filterDesc, sourceDataFlags, targetDataFlags);
// Run through all the instantiated entities and fix up their parent hierarchy:
// - Invalid parents need to get set to the container.
// - Valid parents into the top-level instance mean that the nested slice instance is also child-nested under an entity.
// Prefabs handle this type of nesting differently - we need to set the parent to the container, and the container's
// parent to that other instance.
auto containerEntity = nestedInstance->GetContainerEntity();
auto containerEntityId = containerEntity->get().GetId();
for (auto entity : instantiated->m_entities)
{
AzToolsFramework::Components::TransformComponent* transformComponent =
entity->FindComponent<AzToolsFramework::Components::TransformComponent>();
if (transformComponent)
{
bool onlySetIfInvalid = true;
auto parentId = transformComponent->GetParentId();
if (parentId.IsValid())
{
auto parentAlias = m_aliasIdMapper.find(TemplateEntityIdPair(topLevelInstance->GetTemplateId(), parentId));
if (parentAlias != m_aliasIdMapper.end())
{
// Set the container's parent to this entity's parent, and set this entity's parent to the container
// (i.e. go from A->B to A->container->B)
auto newParentId = topLevelInstance->GetEntityId(parentAlias->second);
SetParentEntity(containerEntity->get(), newParentId, false);
onlySetIfInvalid = false;
}
}
SetParentEntity(*entity, containerEntityId, onlySetIfInvalid);
}
}
// Replace all the entities in the instance with the new patched ones.
// Replace all the entities in the instance with the new patched ones. To do this, we'll remove all existing entities
// throughout the entire nested hierarchy, then add the new patched entities back in at the appropriate place in the hierarchy.
// (This is easier than trying to figure out what the patched data changes are - we can let the JSON patch handle it for us)
nestedInstance->RemoveNestedEntities(
[](const AZStd::unique_ptr<AZ::Entity>&)
{
return true;
});
AZStd::vector<AZStd::pair<AZ::Entity*, AzToolsFramework::Prefab::Instance*>> addedEntityList;
for (auto& entity : instantiated->m_entities)
{
auto entityAlias = m_aliasIdMapper.find(TemplateEntityIdPair(nestedInstance->GetTemplateId(), entity->GetId()));
if (entityAlias != m_aliasIdMapper.end())
auto entityEntry = m_aliasIdMapper.find(entity->GetId());
if (entityEntry != m_aliasIdMapper.end())
{
nestedInstance->AddEntity(*entity, entityAlias->second);
auto& mappingStruct = entityEntry->second;
// Starting with the current nested instance, walk downwards through the nesting hierarchy until we're at the
// correct level for this instanced entity ID, then add it. Because we're adding it with the non-instanced alias,
// it doesn't matter what the slice's instanced entity ID is, and the JSON patch will correctly pick up the changes
// we've made for this instance.
AzToolsFramework::Prefab::Instance* addingInstance = nestedInstance.get();
for (auto it = mappingStruct.m_nestedInstanceAliases.rbegin(); it != mappingStruct.m_nestedInstanceAliases.rend(); it++)
{
auto foundInstance = addingInstance->FindNestedInstance(*it);
if (foundInstance.has_value())
{
addingInstance = &(foundInstance->get());
}
else
{
AZ_Assert(false, "Couldn't find nested instance %s", it->c_str());
}
}
addingInstance->AddEntity(*entity, mappingStruct.m_entityAlias);
addedEntityList.emplace_back(entity, addingInstance);
}
else
{
AZ_Assert(false, "Failed to find entity alias.");
nestedInstance->AddEntity(*entity);
addedEntityList.emplace_back(entity, nestedInstance.get());
}
}
for (auto& [entity, addingInstance] : addedEntityList)
{
// Fix up the parent hierarchy:
// - Invalid parents need to get set to the container.
// - Valid parents into the top-level instance mean that the nested slice instance is also child-nested under an entity.
// Prefabs handle this type of nesting differently - we need to set the parent to the container, and the container's
// parent to that other instance.
auto containerEntity = addingInstance->GetContainerEntity();
auto containerEntityId = containerEntity->get().GetId();
AzToolsFramework::Components::TransformComponent* transformComponent =
entity->FindComponent<AzToolsFramework::Components::TransformComponent>();
if (transformComponent)
{
bool onlySetIfInvalid = true;
auto parentId = transformComponent->GetParentId();
if (parentId.IsValid())
{
// Look to see if the parent ID exists in the same instance (i.e. an entity in the nested slice is a
// child of an entity in the containing slice). If this case exists, we need to adjust the parents so that
// the child entity connects to the prefab container, and the *container* is the child of the entity in the
// containing slice. (i.e. go from A->B to A->container->B)
auto parentEntry = m_aliasIdMapper.find(parentId);
if (parentEntry != m_aliasIdMapper.end())
{
auto& parentMappingInfo = parentEntry->second;
if (parentMappingInfo.m_templateId != addingInstance->GetTemplateId())
{
if (topLevelInstance->GetTemplateId() == parentMappingInfo.m_templateId)
{
parentId = topLevelInstance->GetEntityId(parentMappingInfo.m_entityAlias);
}
else
{
AzToolsFramework::Prefab::Instance* parentInstance = addingInstance;
while ((parentInstance->GetParentInstance().has_value()) &&
(parentInstance->GetTemplateId() != parentMappingInfo.m_templateId))
{
parentInstance = &(parentInstance->GetParentInstance()->get());
}
if (parentInstance->GetTemplateId() == parentMappingInfo.m_templateId)
{
parentId = parentInstance->GetEntityId(parentMappingInfo.m_entityAlias);
}
else
{
AZ_Assert(false, "Could not find parent instance");
}
}
// Set the container's parent to this entity's parent, and set this entity's parent to the container
// auto newParentId = topLevelInstance->GetEntityId(parentMappingInfo.m_entityAlias);
SetParentEntity(containerEntity->get(), parentId, false);
onlySetIfInvalid = false;
}
}
// If the parent ID is valid, but NOT in the top-level instance, then it's just a nested hierarchy inside
// the slice and we don't need to adjust anything. "onlySetIfInvalid" will still be true, which means we
// won't change the parent ID below.
}
SetParentEntity(*entity, containerEntityId, onlySetIfInvalid);
}
}
// Set the container entity of the nested prefab to have the top-level prefab as the parent if it hasn't already gotten
// another entity as its parent.
{
auto containerEntity = nestedInstance->GetContainerEntity();
constexpr bool onlySetIfInvalid = true;
SetParentEntity(containerEntity->get(), topLevelInstance->GetContainerEntityId(), onlySetIfInvalid);
}
@ -531,21 +625,7 @@ namespace AZ
AzToolsFramework::Prefab::PrefabDom topLevelInstanceDomBefore;
instanceToTemplateInterface->GenerateDomForInstance(topLevelInstanceDomBefore, *topLevelInstance);
// When creating the new instance, we would like to have deterministic instance aliases. Prefabs that depend on this one
// will have patches that reference the alias, so if we reconvert this slice a second time, we would like it to produce
// the same results. To get a deterministic and unique alias, we rely on the slice instance. The slice instance contains
// a map of slice entity IDs to unique instance entity IDs. We'll just consistently use the first entry in the map as the
// unique instance ID.
AZStd::string instanceAlias;
auto entityIdMap = instance.GetEntityIdMap();
if (!entityIdMap.empty())
{
instanceAlias = AZStd::string::format("Instance_%s", entityIdMap.begin()->second.ToString().c_str());
}
else
{
instanceAlias = AZStd::string::format("Instance_%s", AZ::Entity::MakeId().ToString().c_str());
}
// Use the deterministic instance alias for this new instance
AzToolsFramework::Prefab::Instance& addedInstance = topLevelInstance->AddInstance(AZStd::move(nestedInstance), instanceAlias);
AzToolsFramework::Prefab::PrefabDom topLevelInstanceDomAfter;
@ -670,5 +750,48 @@ namespace AZ
AZ_Error("Convert-Slice", disconnected, "Asset Processor failed to disconnect successfully.");
}
void SliceConverter::ClearSliceAssetReferences(AZ::Entity* rootEntity)
{
SliceComponent* sliceComponent = AZ::EntityUtils::FindFirstDerivedComponent<SliceComponent>(rootEntity);
// Make a copy of the slice list and remove all of them from the loaded component.
AZ::SliceComponent::SliceList slices = sliceComponent->GetSlices();
for (auto& slice : slices)
{
sliceComponent->RemoveSlice(&slice);
}
}
void SliceConverter::UpdateSliceEntityInstanceMappings(
const AZ::SliceComponent::EntityIdToEntityIdMap& sliceEntityIdMap, const AZStd::string& currentInstanceAlias)
{
// For each instanced entity, map its ID all the way back to the original prefab template and entity ID that it came from.
// This counts on being run recursively from the leaf nodes upwards, so we first get B->A,
// then C->B which becomes a C->A entry, then D->C which becomes D->A, etc.
for (auto& [newId, oldId] : sliceEntityIdMap)
{
// Try to find the conversion chain from the old ID. if it's there, copy it and use it for the new ID, plus add this
// instance's name to the end of the chain. If it's not there, skip it, since it's probably the slice metadata entity,
// which we didn't convert.
auto parentEntry = m_aliasIdMapper.find(oldId);
if (parentEntry != m_aliasIdMapper.end())
{
// Only add this instance's name if we don't already have an entry for the new ID.
if (m_aliasIdMapper.find(newId) == m_aliasIdMapper.end())
{
auto newMappingEntry = m_aliasIdMapper.emplace(newId, parentEntry->second).first;
newMappingEntry->second.m_nestedInstanceAliases.emplace_back(currentInstanceAlias);
}
else
{
// If we already had an entry for the new ID, it might be because the old and new ID are the same. This happens
// when nesting multiple prefabs directly underneath each other without a nesting entity in-between.
// If the IDs are different, it's an unexpected error condition.
AZ_Assert(oldId == newId, "The same entity instance ID has unexpectedly appeared twice in the same nested prefab.");
}
}
}
}
} // namespace SerializeContextTools
} // namespace AZ

30
Code/Tools/SerializeContextTools/SliceConverter.h
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@ -42,8 +42,6 @@ namespace AZ
bool ConvertSliceFiles(Application& application);
private:
using TemplateEntityIdPair = AZStd::pair<AzToolsFramework::Prefab::TemplateId, AZ::EntityId>;
bool ConnectToAssetProcessor();
void DisconnectFromAssetProcessor();
@ -60,10 +58,32 @@ namespace AZ
void SetParentEntity(const AZ::Entity& entity, const AZ::EntityId& parentId, bool onlySetIfInvalid);
void PrintPrefab(AzToolsFramework::Prefab::TemplateId templateId);
bool SavePrefab(AZ::IO::PathView outputPath, AzToolsFramework::Prefab::TemplateId templateId);
void ClearSliceAssetReferences(AZ::Entity* rootEntity);
void UpdateSliceEntityInstanceMappings(
const AZ::SliceComponent::EntityIdToEntityIdMap& sliceEntityIdMap,
const AZStd::string& currentInstanceAlias);
// When converting slice entities, especially for nested slices, we need to keep track of the original
// entity ID, the entity alias it uses in the prefab, and which template and nested instance path it maps to.
// As we encounter each instanced entity ID, we can look it up in this structure and use this to determine how to properly
// add it to the correct place in the hierarchy.
struct SliceEntityMappingInfo
{
SliceEntityMappingInfo(AzToolsFramework::Prefab::TemplateId templateId, AzToolsFramework::Prefab::EntityAlias entityAlias)
: m_templateId(templateId)
, m_entityAlias(entityAlias)
{
}
AzToolsFramework::Prefab::TemplateId m_templateId;
AzToolsFramework::Prefab::EntityAlias m_entityAlias;
AZStd::vector<AzToolsFramework::Prefab::InstanceAlias> m_nestedInstanceAliases;
};
// Track all of the entity IDs created and the prefab entity aliases that map to them. This mapping is used
// with nested slice conversion to remap parent entity IDs to the correct prefab entity IDs.
AZStd::unordered_map<TemplateEntityIdPair, AzToolsFramework::Prefab::EntityAlias> m_aliasIdMapper;
// Track all of the entity IDs created and associate them with enough conversion information to know how to place the
// entities in the correct place in the prefab hierarchy and fix up parent entity ID mappings to work with the nested
// prefab schema.
AZStd::unordered_map<AZ::EntityId, SliceEntityMappingInfo> m_aliasIdMapper;
// Track all of the created prefab template IDs on a slice conversion so that they can get removed at the end of the
// conversion for that file.

2
Code/Tools/SerializeContextTools/SliceConverterEditorEntityContextComponent.h
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@ -36,7 +36,7 @@ namespace AzToolsFramework
SliceConverterEditorEntityContextComponent() : EditorEntityContextComponent() {}
// Simple API to selectively disable this logic *only* when performing slice to prefab conversion.
static void DisableOnContextEntityLogic()
static inline void DisableOnContextEntityLogic()
{
m_enableOnContextEntityLogic = false;
}

10
Code/Tools/SerializeContextTools/Utilities.cpp
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@ -209,7 +209,11 @@ namespace AZ::SerializeContextTools
return result;
}
bool Utilities::InspectSerializedFile(const char* filePath, SerializeContext* sc, const ObjectStream::ClassReadyCB& classCallback)
bool Utilities::InspectSerializedFile(
const char* filePath,
SerializeContext* sc,
const ObjectStream::ClassReadyCB& classCallback,
Data::AssetFilterCB assetFilterCallback)
{
if (!AZ::IO::FileIOBase::GetInstance()->Exists(filePath))
{
@ -248,9 +252,9 @@ namespace AZ::SerializeContextTools
AZ::IO::MemoryStream stream(data.data(), fileLength);
ObjectStream::FilterDescriptor filter;
// Never load dependencies. That's another file that would need to be processed
// By default, never load dependencies. That's another file that would need to be processed
// separately from this one.
filter.m_assetCB = AZ::Data::AssetFilterNoAssetLoading;
filter.m_assetCB = assetFilterCallback;
if (!ObjectStream::LoadBlocking(&stream, *sc, classCallback, filter))
{
AZ_Printf("Verify", "Failed to deserialize '%s'\n", filePath);

6
Code/Tools/SerializeContextTools/Utilities.h
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@ -39,7 +39,11 @@ namespace AZ
static AZStd::vector<AZ::Uuid> GetSystemComponents(const Application& application);
static bool InspectSerializedFile(const char* filePath, SerializeContext* sc, const ObjectStream::ClassReadyCB& classCallback);
static bool InspectSerializedFile(
const char* filePath,
SerializeContext* sc,
const ObjectStream::ClassReadyCB& classCallback,
Data::AssetFilterCB assetFilterCallback = AZ::Data::AssetFilterNoAssetLoading);
private:
Utilities() = delete;

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