bool UWorldComposition::UpdateEditorStreamingState(const FVector& InLocation)
{
UWorld* OwningWorld = GetWorld();
bool bStateChanged = false;
// Handle only editor worlds
if (!OwningWorld->IsGameWorld() &&
!OwningWorld->IsVisibilityRequestPending())
{
// Get the list of visible and hidden levels from current view point
TArray<FDistanceVisibleLevel> DistanceVisibleLevels;
TArray<FDistanceVisibleLevel> DistanceHiddenLevels;
GetDistanceVisibleLevels(InLocation, DistanceVisibleLevels, DistanceHiddenLevels);
// Hidden levels
for (const auto& Level : DistanceHiddenLevels)
{
ULevelStreaming* EditorStreamingLevel = OwningWorld->GetLevelStreamingForPackageName(TilesStreaming[Level.TileIdx]->GetWorldAssetPackageFName());
if (EditorStreamingLevel &&
EditorStreamingLevel->IsLevelLoaded() &&
EditorStreamingLevel->bShouldBeVisibleInEditor != false)
{
EditorStreamingLevel->bShouldBeVisibleInEditor = false;
bStateChanged = true;
}
}
// Visible levels
for (const auto& Level : DistanceVisibleLevels)
{
ULevelStreaming* EditorStreamingLevel = OwningWorld->GetLevelStreamingForPackageName(TilesStreaming[Level.TileIdx]->GetWorldAssetPackageFName());
if (EditorStreamingLevel &&
EditorStreamingLevel->IsLevelLoaded() &&
EditorStreamingLevel->bShouldBeVisibleInEditor != true)
{
EditorStreamingLevel->bShouldBeVisibleInEditor = true;
bStateChanged = true;
}
}
}
return bStateChanged;
}
void FFoliageInstanceBaseCache::CompactInstanceBaseCache(AInstancedFoliageActor* IFA)
{
UWorld* World = IFA->GetWorld();
if (!World || World->IsGameWorld())
{
return;
}
FFoliageInstanceBaseCache& Cache = IFA->InstanceBaseCache;
TSet<FFoliageInstanceBaseId> BasesInUse;
for (auto& Pair : IFA->FoliageMeshes)
{
for (const auto& Pair : Pair.Value->ComponentHash)
{
if (Pair.Key != FFoliageInstanceBaseCache::InvalidBaseId)
{
BasesInUse.Add(Pair.Key);
}
}
}
// Look for any removed maps
TSet<FFoliageInstanceBasePtr> InvalidBasePtrs;
for (auto& Pair : Cache.InstanceBaseLevelMap)
{
const auto& WorldAsset = Pair.Key;
bool bExists = (WorldAsset == World);
// Check sub-levels
if (!bExists)
{
const FName PackageName = FName(*FPackageName::ObjectPathToPackageName(WorldAsset.ToStringReference().ToString()));
if (World->WorldComposition)
{
bExists = World->WorldComposition->DoesTileExists(PackageName);
}
else
{
bExists = (World->GetLevelStreamingForPackageName(PackageName) != nullptr);
}
}
if (!bExists)
{
InvalidBasePtrs.Append(Pair.Value);
Cache.InstanceBaseLevelMap.Remove(Pair.Key);
}
else
{
// Remove dead links
for (int32 i = Pair.Value.Num()-1; i >= 0; --i)
{
// Base needs to be removed if it's not in use by existing instances or component was removed
if (Pair.Value[i].IsNull() || !BasesInUse.Contains(Cache.GetInstanceBaseId(Pair.Value[i])))
{
InvalidBasePtrs.Add(Pair.Value[i]);
Pair.Value.RemoveAt(i);
}
}
if (Pair.Value.Num() == 0)
{
Cache.InstanceBaseLevelMap.Remove(Pair.Key);
}
}
}
TSet<FFoliageInstanceBaseId> InvalidBaseIds;
Cache.InstanceBaseInvMap.Empty();
// Look for any removed base components
for (const auto& Pair : Cache.InstanceBaseMap)
{
const FFoliageInstanceBaseInfo& BaseInfo = Pair.Value;
if (InvalidBasePtrs.Contains(BaseInfo.BasePtr))
{
InvalidBaseIds.Add(Pair.Key);
Cache.InstanceBaseMap.Remove(Pair.Key);
}
else
{
// Regenerate inverse map
check(!Cache.InstanceBaseInvMap.Contains(BaseInfo.BasePtr));
Cache.InstanceBaseInvMap.Add(BaseInfo.BasePtr, Pair.Key);
}
}
if (InvalidBaseIds.Num())
{
for (auto& Pair : IFA->FoliageMeshes)
{
auto& MeshInfo = Pair.Value;
MeshInfo->ComponentHash.Empty();
int32 InstanceIdx = 0;
for (FFoliageInstance& Instance : MeshInfo->Instances)
{
if (InvalidBaseIds.Contains(Instance.BaseId))
{
Instance.BaseId = FFoliageInstanceBaseCache::InvalidBaseId;
}
MeshInfo->ComponentHash.FindOrAdd(Instance.BaseId).Add(InstanceIdx);
InstanceIdx++;
}
}
Cache.InstanceBaseMap.Compact();
Cache.InstanceBaseLevelMap.Compact();
}
}