G - Physics – 09 – G
Patent
G - Physics
09
G
G09G 5/36 (2006.01) G06T 15/40 (2006.01) G09G 5/393 (2006.01)
Patent
CA 2110551
ABSTRACT A method for rendering of three dimensional images on a video subsystem which does not include clearing of the Z buffer at each frame includes establishment of a Z buffer and a sequence number in memory, where the sequence number is incremented with each successive frame rendered and the Z buffer is cleared when the sequence number reaches a predetermined value; the Z buffer is thus recycled a number of times between clears. In a more elaborate implementation, the precision of the Z buffer is adjusted to permit clearing of the Z buffer to occur either as the result of the sequence number reaching a predetermined value or as the result of the accrual of a predetermined amount of time allocated for clearing, referred to as scheduling. The schedulingmethod can be applied to a wide range of accounting tasks within a system. In addition, a related method for recycling the image buffer is also disclosed in which multiple colormap ID's are used to distinguish data included in a current frame from data in a prior frame, where the colormap ID's associated with the prior frames all map to the background color, leaving to be displayed only the data of the current frame.
Cassan Maclean
Network Computing Devices Inc.
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