After some searching, I found the answer to my question. We can use the following arguments: pixel_position_in_tile – (x, y) position of the fragment in the tile. pixels_per_tile – (width, height) of the tile in pixels. tile_index – 1D tile index. fragment FragmentIO my_fragment(FragmentIO i, ushort index [[tile_index]], ushort2 pixelPositionInTile [[pixel_position_in_tile]], ushort2 pixelPerTile [[pixels_per_tile ]]) { FragmentIO fragOut; return fragOut; }

Thank you for your reply. I’m already familiar with the examples you provided. Unfortunately they do not solve my problem, because the(Creating a Metal Dynamic Library) sample only covers up to step one, and my code is actually based on the information shown in the video (Build GPU binaries with Metal).