スパーステクスチャを処理するためのクラス
スパーステクスチャは全テクスチャデータが一度にメモリに存在するのではないテクスチャです。これらは一般的に"タイル状のテクスチャ"や"メガテクスチャと呼ばれています。
ピクセルあたり 32 ビットで 16384x16384 のテクスチャを想像してみよう - それは 1GB のメモリを取るでしょう。テクスチャは長方形の"タイルに分割され、各タイルはメモリ内か外のいずれかに存在することができます。カメラからの距離、プレイヤーが見えている世界での活動範囲などに基づいて、必要に応じてこれらのタイルをロードとアンロードすることができます。
それ以外では、スパーステクスチャはシェーダー内の他のテクスチャと同じように扱えます - ミップマップを持たせる、テクスチャフィルタリングモードを使う、等々。存在しないタイルを読み取るようなことが起きた場合は、未定義の結果を得ることになります（多くの GPU 上では黒色になりますが、必ずそうなるとは限りません）。
Not all hardware and platforms support sparse textures, so you should check SystemInfo.supportsSparseTextures before using them. For example, on DirectX systems they require DX11.2 (Windows 8.1) and a fairly recent GPU; and on OpenGL they require ARB_sparse_texture extension support. Sparse textures only support non-compressed texture formats.
スパーステクスチャを作成した後、 tileWidth と tileHeight のタイルサイズを照会します。タイルサイズはプラットフォームと GPU に依存します。
タイルをメモリに常駐し、その色のデータを更新するために UpdateTile や UpdateTileRaw を使用します。タイルをアンロードするために UnloadTile を使用します。
Additional resources: Sparse Textures.
| isCreated | スパーステクスチャを実際に作成するか。(Read Only) |
| tileHeight | スパーステクスチャタイルの高さを取得します。(Read Only) |
| tileWidth | スパーステクスチャタイルの幅を取得します。(Read Only) |
| SparseTexture | スパーステクスチャを作成する。 |
| UnloadTile | スパーステクスチャファイルをアンロードします。 |
| UpdateTile | カラー値を持つスパーステクスチャのタイルを更新します。 |
| UpdateTileRaw | RAW のピクセル値でスパーステクスチャファイルを更新します。 |
| allowThreadedTextureCreation | Allow Unity internals to perform Texture creation on any thread (rather than the dedicated render thread). |
| currentTextureMemory | The amount of memory that all Textures in the scene use. |
| desiredTextureMemory | The total size of the Textures, in bytes, that Unity loads if there were no other constraints. Before Unity loads any Textures, it applies the memory budget which reduces the loaded Texture resolution if the Texture sizes exceed its value. The desiredTextureMemory value takes into account the mipmap levels that Unity has requested or that you have set manually.For example, if Unity does not load a Texture at full resolution because it is far away or its requested mipmap level is greater than 0, Unity reduces the desiredTextureMemory value to match the total memory needed.The desiredTextureMemory value can be greater than the Texture.targetTextureMemory value. |
| GenerateAllMips | Can be used with Texture constructors that take a mip count to indicate that all mips should be generated. The value of this field is -1. |
| nonStreamingTextureCount | The number of non-streaming Textures in the scene. This includes instances of Texture2D and CubeMap Textures. This does not include any other Texture types, or 2D and CubeMap Textures that Unity creates internally. |
| nonStreamingTextureMemory | The amount of memory Unity allocates for non-streaming Textures in the scene. This only includes instances of Texture2D and CubeMap Textures. This does not include any other Texture types, or 2D and CubeMap Textures that Unity creates internally. |
| streamingMipmapUploadCount | How many times has a Texture been uploaded due to Texture mipmap streaming. |
| streamingRendererCount | Number of renderers registered with the Texture streaming system. |
| streamingTextureCount | Number of streaming Textures. |
| streamingTextureDiscardUnusedMips | This property forces the streaming Texture system to discard all unused mipmaps instead of caching them until the Texture memory budget is exceeded. This is useful when you profile or write tests to keep a predictable set of Textures in memory. |
| streamingTextureForceLoadAll | Force streaming Textures to load all mipmap levels. |
| streamingTextureLoadingCount | Number of streaming Textures with mipmaps currently loading. |
| streamingTexturePendingLoadCount | Number of streaming Textures with outstanding mipmaps to be loaded. |
| targetTextureMemory | The total amount of Texture memory that Unity allocates to the Textures in the scene after it applies the memory budget and finishes loading Textures. `targetTextureMemory`also takes mipmap streaming settings into account. This value only includes instances of Texture2D and CubeMap Textures. This value does not include any other Texture types, or 2D and CubeMap Textures that Unity creates internally. |
| totalTextureMemory | The total amount of Texture memory that Unity would use if it loads all Textures at mipmap level 0.This is a theoretical value that does not take into account any input from the streaming system or any other input, for example when you set the`Texture2D.requestedMipmapLevel` manually.To see a Texture memory value that takes inputs into account, use `desiredTextureMemory`.`totalTextureMemory` only includes instances of Texture2D and CubeMap Textures. This value does not include any other Texture types, or 2D and CubeMap Textures that Unity creates internally. |
| hideFlags | Should the object be hidden, saved with the Scene or modifiable by the user? |
| name | オブジェクト名 |
| anisoLevel | Defines the anisotropic filtering level of the Texture. |
| dimension | Dimensionality (type) of the Texture (Read Only). |
| filterMode | Filtering mode of the Texture. |
| graphicsFormat | Returns the GraphicsFormat format or color format of a Texture object. |
| graphicsTexture | GraphicsTexture that represents the texture resource uploaded to the graphics device (Read Only). |
| height | Height of the Texture in pixels (Read Only). |
| imageContentsHash | The hash value of the Texture. |
| isDataSRGB | Returns true if the texture pixel data is in sRGB color space (Read Only). |
| isReadable | Whether Unity stores an additional copy of this texture's pixel data in CPU-addressable memory. |
| mipMapBias | The mipmap bias of the Texture. |
| mipmapCount | How many mipmap levels are in this Texture (Read Only). |
| updateCount | This counter is incremented when the Texture is updated. |
| width | Width of the Texture in pixels (Read Only). |
| wrapMode | Texture coordinate wrapping mode. |
| wrapModeU | Texture U coordinate wrapping mode. |
| wrapModeV | Texture V coordinate wrapping mode. |
| wrapModeW | Texture W coordinate wrapping mode for Texture3D. |
| GetInstanceID | Gets the instance ID of the object. |
| ToString | Returns the name of the object. |
| GetNativeTexturePtr | Retrieve a native (underlying graphics API) pointer to the Texture resource. |
| IncrementUpdateCount | Increment the update counter. |
| Destroy | Removes a GameObject, component or asset. |
| DestroyImmediate | Destroys the object obj immediately. You are strongly recommended to use Destroy instead. |
| DontDestroyOnLoad | Do not destroy the target Object when loading a new Scene. |
| FindAnyObjectByType | Retrieves any active loaded object of Type type. |
| FindFirstObjectByType | Retrieves the first active loaded object of Type type. |
| FindObjectsByType | Retrieves a list of all loaded objects of Type type. |
| Instantiate | original のオブジェクトをクローンします |
| SetGlobalAnisotropicFilteringLimits | 異方性のリミットを設定します |
| SetStreamingTextureMaterialDebugProperties | This function sets mipmap streaming debug properties on any materials that use this Texture through the mipmap streaming system. |
| bool | オブジェクトが存在するかどうか |
| operator != | 二つのオブジェクトが異なるオブジェクトを参照しているか比較します |
| operator == | 2つのオブジェクト参照が同じオブジェクトを参照しているか比較します。 |