Arm Limited

Arm Norway As

Erik Faye-Lund

Jorn Nystad

Eivind Liland

In a graphics processing system, the left, right, top and bottom edge planes for the purposes of clipping are set to the maximum values that can be represented using floating-point format numbers, vertex positions are snapped to a grid of predefined vertex positions, and the precision of selected vertices is prioritized when deriving edge functions for a given primitive. In respect of the depth near and far clipping planes, those planes are set to the maximum floating-point number format that can be represented for 'Z' in the graphics system, but then fragments that have a Z value that falls outside the range zero to one are discarded using a depth test. In respect of the eye-plane, the need for clipping is avoided by modifying edge equations generated for a primitive in dependence on the sign of a 'W' value for each vertex of the primitive.

Methods of and apparatus for processing computer graphics

A graphics processing apparatusincludes graphics processing pipelines. The graphics processing pipelinesinclude a programmable hardware stage, a pipeline memoryand writeback circuitry. Programmable resolving circuitryis provided by the programmable hardware stagewithin each pipeline and is responsive to one or more graphics program instructions to read pixel values at a first resolution generated within the pipeline memoryby pixel value generating circuitryprovided by the programmable hardware stageand to perform a resolving operation upon these pixels values so as to generate pixel values at a second resolution. These pixel values at the second resolution are then written back to a frame buffer memory

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Trondheim, Norway

Erik Faye-Lund