Method and apparatus for processing computer graphics primitives in tile-based graphics rendering system

A method of generating a render output in a tile-based graphics processing system, the method comprising, for each tile of the render output:

• reading a data entry for a group of primitives for the render output, which data entry comprises an indication of the identity of the plurality of primitives in the group of primitives, and an indication of the rendering tiles that it has been determined the group of primitives should be processed for;
• determining, using the indication in the data entry for the group of primitives, if the group of primitives should be processed for the tile;
• and
• when the group of primitives is determined to be processed for the tile:
• rendering the primitives of the plurality of primitives in the group of primitives, identified by the indication of the identity of the plurality of primitives in the data entry for the group of primitives, that fall at least partially in the tile.

A tile-based graphics processing system comprising processing circuitry capable of, when generating a render output, for each tile of the render output:

• reading a data entry for a group of primitives for the render output, which data entry comprises an indication of the identity of the plurality of primitives in the group of primitives, and an indication of the rendering tiles that it has been determined the group of primitives should be processed for;
• determining, using the indication in the data entry for the group of primitives, if the group of primitives should be processed for the tile;
• and
• when the group of primitives is determined to be processed for the tile:
• rendering the primitives of the plurality of primitives in the group of primitives, identified by the indication of the identity of the plurality of primitives in the data entry for the group of primitives, that fall at least partially in the tile.

A non-transitory computer readable storage medium storing computer software code which when executing on a processor performs a method of processing primitives in a tile-based graphics processing system, the method comprising:

• for a group of plural primitives to be rendered:
• determining, for the group of primitives the rendering tiles that the group of primitives should be processed for;
• and
• storing, for the group of primitives, a data entry comprising an indication of the identity of the plurality of primitives in the group of primitives, and an indication of the rendering tiles that it has been determined the group of primitive should be processed for.