Dynamic switching of texture mip-maps based on pixel depth value

Details Dynamic switching of texture mip-maps based on pixel depth value Dynamic switching of texture mip-maps based on pixel depth value

1996-09-30

1999-10-26

Feild, Joseph H.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1140

Patent

active

059737018

ABSTRACT:
A graphics subsystem includes hardware and/or software for permitting mip-maps to be dynamically switched based upon depth (Z) values. In addition, the system generates a SHIFT signal to permit automatic adjustment of texture parameters to facilitate retrieval of texture maps. The system includes a mip-map select logic or routine that compares the depth value of a pixel to be rendered with predetermined depth values. The depth values may be stored in a plurality of depth registers, and compared with the depth value of a pixel in a plurality of associated comparators. A mip-map is selected based upon the comparisons, and the SHIFT signal is generated to indicate the order of change with respect to a base reference mip-map. A texture engine receives the SHIFT signal and uses the associated base address of the selected mip-map and shifted texture parameters to define an address for the texture map.

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patent: 5680525 (1997-10-01), Sakai et al.
patent: 5706481 (1998-01-01), Hannah et al.
patent: 5719599 (1998-02-01), Yang
patent: 5734386 (1998-03-01), Cosman
US Patent Application Serial No. 08/720,395; filed Sep. 30, 1996.

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