Lighting unit for a three-dimensional graphics accelerator with

Details Lighting unit for a three-dimensional graphics accelerator with Lighting unit for a three-dimensional graphics accelerator with

1997-06-30

2000-01-18

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06T 1550

Patent

active

060161493

ABSTRACT:
A lighting unit for improved processing of multiple light sources. The lighting unit includes an input buffer for receiving one or more attributes corresponding to a given polygon. The lighting unit further includes a first light parameter storage location for storing a first set of light parameters for a first light source illuminating the given polygon, and a second light parameter storage location for storing a second set of light parameters for a second light source illuminating the given polygon. Still further, the lighting unit includes a first light type storage location which stores a lighting routine index for the first light source, and a second light type storage location which stores a lighting routine index for the second light source. The first light type storage location is initialized to be a current light type storage location. The lighting routine indices point to a particular lighting routine to be performed for a given type of light source. The lighting unit finally includes a control unit configured to execute a next light instruction. The next light instruction comprises accessing the current light type storage location to obtain the first lighting routine index. The next light instruction further comprises updating the current light type storage location to be the second light type storage location in preparation for a subsequent execution of the next light instruction. The control unit is further configured to effectuate performing a first lighting routine specified by the first lighting routine index.

REFERENCES:
patent: 4866637 (1989-09-01), Gonzalez-Lopez et al.
patent: 4901064 (1990-02-01), Deering
patent: 5517611 (1996-05-01), Deering

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