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).

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; }