Efficient clip-testing in graphics acceleration

Details Efficient clip-testing in graphics acceleration Efficient clip-testing in graphics acceleration

2006-05-09

2006-05-09

Brier, Jeffery (Department: 2672)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S590000

Reexamination Certificate

active

07042466

ABSTRACT:
A method and apparatus for performing fast clip-testing operations in a general purpose processor are provided. This is accomplished by executing a single instruction for comparing a first value x to a second value y and, as a result of the comparison, determining whether x is less than y and whether x is less than negative y. The values x and y are stored in respective source registers of the processor specified by the instruction. Finally, as a result of the determination, one or more binary values representing the results of the determination are inserted into a destination register of the processor also specified by the instruction. Accordingly, the invention advantageously provides a general purpose processor with the ability to execute a clip-testing function with a single instruction compared with prior art general purpose processors that require multiple instructions to perform the same function. Thus, the general purpose processor of the present invention allows for more efficient and faster clip-testing operations.

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