Texture compositing apparatus and method

Details Texture compositing apparatus and method Texture compositing apparatus and method

1998-04-08

1999-02-09

Buchel, Jr., Rudolph J.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345501, G06T 1140

Patent

active

058701028

ABSTRACT:
A texture compositing apparatus and method for combining multiple independent texture colors in a variety of ways in a single execution pass using a single texture compositing unit (TCU) per texture. The TCU receives a control signal, a blend factor, a local data signal(C.sub.local /A.sub.local) and an output data signal (C.sub.in /A.sub.in) generated by another TCU, the local data signal and the output data signal represent a texture color in a RGBA format. Based upon the control signal, the TCU can generate an output signal based on a variety of functions. The outputs that can be generated include but are not limited to: (1) zero; (2) one; (3) C.sub.in ; (4) C.sub.local ; (5) C.sub.in +C.sub.local ; (6) C.sub.in -C.sub.local ; (7) C.sub.in *C.sub.local ; (8) C.sub.in *C.sub.local +A.sub.local ; (9) C.sub.in *A.sub.local +C.sub.local ; (10) (C.sub.in -C.sub.local)* F.sub.blend +C.sub.local ; and (11) (C.sub.in -C.sub.local)*(1-F.sub.blend)+C.sub.local. Another feature of the invention is that multiple TCUs can be serially coupled to enable additional texture colors to be combined in a single execution path.

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