Generation of a control stream for a tile

A graphics processing system comprising a tiling unit for processing primitives for each of a plurality of tiles, the tiling unit being configured to:

• form a sub-polygon inside a tile, the sub-polygon representing part of a primitive that overlaps the tile;
• determine whether the sub-polygon overlaps sample positions within the tile, to thereby determine whether the primitive falls within the tile;
• and
• cause an association between the tile and the primitive to be stored to indicate that the primitive is present in the tile if the primitive is determined to fall within the tile.

A non-transitory computer readable storage medium having stored thereon a computer readable dataset of an integrated circuit that, when processed in an integrated circuit manufacturing system, causes the integrated circuit manufacturing system to manufacture a graphics processing system comprising a tiling unit for processing primitives for each of a plurality of tiles, the tiling unit being configured to:

• forma sub-polygon inside a tile, the sub-polygon representing part of a primitive that overlaps the tile;
• determine whether the sub-polygon overlaps sample positions within the tile, to thereby determine whether the primitive falls within the tile;
• and
• cause an association between the tile and the primitive to be stored to indicate that the primitive is present in the tile if the primitive is determined to fall within the tile.