The current GraphicsTexture object corresponding to the texture.
For RenderTextures, this returns the GraphicsTexture object that represents the color buffer. If the RenderTexture is depth-only and has a GraphicsFormat of None, it returns the GraphicsTexture object representing the depth buffer.
Note: When you use the Unity APIs to reinitialize the properties of a Texture object, or when a different mipmap level is streamed in, the underlying GraphicsTexture object changes. Instead of caching the value, retrieve the new GraphicsTexture by calling Texture.graphicsTexture again.