Apparatus and method for loading coordinate registers for...

Details Apparatus and method for loading coordinate registers for... Apparatus and method for loading coordinate registers for...

G - Physics

09

G

375/12

G09G 5/36 (2006.01) G06T 11/20 (2006.01) G06T 15/10 (2006.01)

Patent

CA 1317042

ABSTRACT Apparatus and method for using an index register which Gycles modulo 4 for loading registers which contain coordinates of four vertices of quadrilateral objects, including degenerate quadrilateral objects, namely a point, a line and a triangle, which are to be displayed by a graphics display subsystem. In this manner, a software command need only define the minimum number of X,Y coordinate pairs to define the object, i.e., one coordinate pair for a point, two coordinate pairs for a line, three coordinate pairs for a triangle and two coordinate pairs for a rectangle (by defining opposite corners). Additionally, by using an index register according to the present invention, objects can be efficiently replicated.

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