さまざまな Graphics.CopyTexture ケースをサポートします (読み込み専用)。
Most modern platforms and graphics APIs support quite flexible texture copy (e.g. copy from a RenderTexture
into a Cubemap face). However some older systems might not support certain parts of texture copy functionality.
CopyTextureSupport flags indicate this.
Additional resources: Graphics.CopyTexture, CopyTextureSupport.