+ TextureSet SetLoadingFailed();
+
+ /**
+ * @brief Allocate mask data.
+ * This is allocated only once.
+ */
+ void AllocateMaskData();
+
+ /**
+ * @brief Check whether the mask texture is loaded or not.
+ * If MaskingType is MASKING_ON_LOADING and mask texture is failed to load, update shader.
+ */
+ void CheckMaskTexture();