Graphics processing

A graphics processor comprising:

• a packet generating circuit configured to generate packets comprising sets of primitives to be processed for a render output, each packet comprising:
• a set of vertices for the primitives of the packet;
• and
• for each primitive of the packet, primitive data indicating which of the vertices that the packet stores relate to the primitive;
• the packet generating circuit further configured to, for a primitive of a packet that has undergone a clipping process for a render output being generated, store in the packet:
• an indication that the primitive has undergone a clipping process;
• and
• for any vertices that were generated for the primitive as a result of the clipping process, one or more attributes for those vertices;
• the graphics processor further comprising:
• a rendering circuit configured to process packets generated by the packet generating circuit.

A non-transitory computer readable storage medium storing computer software code which when executing on one or more processors performs a method of operating a graphics processor when generating a render output in which primitives to be rendered can be clipped against a clip plane defined for the render output, the method comprising:

• generating a packet comprising a set of primitives to be processed for the render output, the packet comprising:
• a set of vertices for the primitives of the packet;
• and
• for each primitive of the packet, primitive data indicating which of the vertices that the packet stores relate to the primitive;
• the method further comprising:
• for a primitive of the packet that has undergone a clipping process for the render output being generated, storing in the packet:
• an indication that the primitive has undergone a clipping process;
• and
• for any vertices that were generated for the primitive as a result of the clipping process, one or more attributes for those vertices;
• providing the packet to a rendering process for processing;
• and
• the rendering process processing the packet.