Hi all. I currently use 4 function calls to sample the neightbouring texels (it is not for shadow mapping). I read that ATI has a feature called Fetch4 that is able to fetch these texels in a single call from a 1-component texture. From searching around I can understand that this feature is mandatory in DX10.1 (SM4.1) and called Gather4. It does not look like the same functionality is possible on a NVidia 8800GTS-512 (DX10/SM4). In fact it does not look like it is possible on any current Nvidia GPU. Is this correct? One can perhaps assume it will be supported in GF9900 comming out later this year (DX10.1)?!