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  3. ULandscapeTextureHash

ULandscapeTextureHash

API > API/Runtime > API/Runtime/Landscape

   
Name ULandscapeTextureHash
Type class
Header File /Engine/Source/Runtime/Landscape/Classes/LandscapeTextureHash.h
Include Path #include "LandscapeTextureHash.h"

Syntax

UCLASS (NotBlueprintable, MinimalAPI, Within=Texture2D)  
class ULandscapeTextureHash : public UAssetUserData

Inheritance Hierarchy

Variables

Protected

Name Type Remarks Include Path Unreal Specifiers
LastSourceID FGuid   LandscapeTextureHash.h  
RecentlySerializedHashes TMap< FGuid, FGuid > Cache of recently serialized hash values this ensure that if the texture is brought back to match exactly a recently serialized state, it will have exactly the same hash that it was serialized with. LandscapeTextureHash.h  
TextureHashGUID FGuid   LandscapeTextureHash.h  
TextureType ELandscapeTextureType Heightmap or weightmap. When unknown, we fallback to using the texture source ID as hash (old behavior) LandscapeTextureHash.h  
TextureUsage ELandscapeTextureUsage Edit layer data or final data. When unknown, we fallback to using the texture source ID as hash (old behavior) LandscapeTextureHash.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

virtual bool IsEditorOnly()

   LandscapeTextureHash.h  

virtual bool NeedsLoadForClient()

   LandscapeTextureHash.h  

virtual bool NeedsLoadForServer()

   LandscapeTextureHash.h  

virtual void Serialize ( FArchive& Ar
)

   LandscapeTextureHash.h  

Static

Name Remarks Include Path Unreal Specifiers

static uint64 CalculateTextureHash64 ( UTexture2D* LandscapeTexture,
ELandscapeTextureType TextureType,
bool& bOutHashIsValid
)

 Calculate the texture hash directly from the source mip0 contents LandscapeTextureHash.h  

static uint64 CalculateTextureHash64 ( const FColor* Mip0Data,
int32 PixelCount,
ELandscapeTextureType TextureType
)

 Calculate the texture hash from the Mip0Data buffer LandscapeTextureHash.h  

static FGuid CalculateTextureHashGUID ( UTexture2D* LandscapeTexture,
ELandscapeTextureType TextureType,
bool& bOutHashIsValid
)

   LandscapeTextureHash.h  

static void CheckHashIsUpToDate ( UTexture2D* LandscapeTexture
)

 Check the hash is up to date. LandscapeTextureHash.h  

static bool DoesTextureDataChangeExceedThreshold ( const FColor* Mip0Data,
const FColor* OldMip0Data,
int32 PixelCount,
ELandscapeTextureType TextureType,
uint64 OldHash,
uint64 NewHash,
TOptional< uint8 >& OutChangedWeightmapChannelsMasks
)

 Check if the Mip0Data is within the change threshold of OldMip0Data LandscapeTextureHash.h  

static FGuid GetHash ( UTexture2D* LandscapeTexture
)

 Get the current stored hash for the landscape texture, checking that it is up to date LandscapeTextureHash.h  

static void SetHash64 ( UTexture2D* LandscapeTexture,
uint64 NewHash,
ELandscapeTextureUsage TextureUsage,
ELandscapeTextureType TextureType
)

 Explicitly set the hash for the specified LandscapeTexture. LandscapeTextureHash.h  

static void SetInitialStateOnPostLoad ( UTexture2D* LandscapeTexture,
ELandscapeTextureUsage TextureUsage,
ELandscapeTextureType TextureType
)

 Setup initial state on load, if it doesn't yet exist LandscapeTextureHash.h  

static void UpdateHash ( UTexture2D* LandscapeTexture,
ELandscapeTextureUsage TextureUsage,
ELandscapeTextureType TextureType,
bool bForceUpdate
)

 Update the stored hash based on the source data. LandscapeTextureHash.h  

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