Graphics processing

Abstract

When generating a render output in which primitives to be rendered – by a graphics processing pipeline running on a graphics processor (GPU) – can be clipped against clip planes defined for the render output, for a primitive that is to undergo a clipping process as part of its processing for the render output, when the clipping process generates one or more new vertices for the primitive, the clipping process generates position attributes for the new vertices that are generated as a result of the clipping process, and, thereafter, the rendering stage uses the position attributes generated by the clipping process for the new vertices generated as a result of the clipping process for the primitive when determining the values of one or more non-position attributes when processing the primitive that underwent the clipping process for the render output. In embodiments the position attributes are used by an interpolation unit 606 as part of the processing of the non-position attributes. The position attributes of the new vertices may be barycentric coordinates or clip space positions. The non-position attributes may be colour or transparency attributes. [Fig. 20]