Patent ID: 8115783

Claim:
A method of operating a graphics processing system when processing graphics primitives for display in which a clipping area defining left, right, top, and bottom edge planes within which a primitive must lie for processing is defined, the method comprising: defining the x, y positions of vertices representing primitives to be processed for display in floating-point format; a graphics processor snapping the x, y positions of vertices of primitives to be processed for display to respective vertex x, y positions from a set of plural vertex x, y positions defined for the processing of primitives; the graphics processor using the vertex position in the set that a given vertex is snapped to as the x, y position of the vertex when deriving an edge function or the edge functions for an edge or the edges that includes the vertex; and setting respective x, y positions of the left, right, top and bottom edge planes defining the clipping area to the respective largest position values that can be represented in floating-point format in the graphics processing system.