Tiling a primitive in a graphics processing system

A graphics processing system comprising a tiling unit for tiling a primitive to determine which of a plurality of tiles of a rendering space the primitive is in, the tiling unit being configured to:

• determine a bounding box for the primitive;
• determine that lines of tiles are rows of tiles if there are fewer rows of tiles than columns of tiles in the bounding box, or determine that lines of tiles are columns of tiles if there are fewer columns of tiles than rows of tiles in the bounding box;
• for each of at least one tile boundary between the lines of tiles in the bounding box, determine intersection points of the tile boundary with edges of the primitive;
• use the determined intersection points to determine which of the tiles in the bounding box the primitive is in;
• and
• cause data to be stored indicating which of the tiles in the bounding box the primitive is in, wherein the graphics processing system is configured to render the primitive in accordance with the stored data.

A non-transitory computer readable storage medium having stored thereon computer executable instructions that when executed cause at least one processor to process a primitive in a graphics processing system, to determine which of a plurality of tiles of a rendering space the primitive is in, by

• determining a bounding box for the primitive;
• determining that lines of tiles are rows of tiles if there are fewer rows of tiles than columns of tiles in the bounding box or determining that lines of tiles are columns of tiles if there are fewer columns of tiles than rows of tiles in the bounding box;
• for each of at least one tile boundary between the lines of tiles in the bounding box, determining intersection points of the tile boundary with edges of the primitive;
• using the determined intersection points to determine which of the tiles in the bounding box the primitive is in;
• and
• storing data indicating which of the tiles in the bounding box the primitive is in, wherein the primitive is rendered in accordance with the stored data.

A non-transitory computer readable storage medium having stored thereon computer readable code for generating a graphics processing system comprising a tiling unit for tiling a primitive to determine which of a plurality of tiles of a rendering space the primitive is in, the tiling unit being configured to:

• determine a bounding box for the primitive;
• determine that lines of tiles are rows of tiles if there are fewer rows of tiles than columns of tiles in the bounding box, or determine that lines of tiles are columns of tiles if there are fewer columns of tiles than rows of tiles in the bounding box;
• for each of at least one tile boundary between the lines of tiles in the bounding box, determine intersection points of the tile boundary with edges of the primitive;
• use the determined intersection points to determine which of the tiles in the bounding box the primitive is in;
• and
• cause data to be stored indicating which of the tiles in the bounding box the primitive is in, the graphics processing system being configured to render the primitive in accordance with the stored data.