System and method for drawing antialiased polygons

Details System and method for drawing antialiased polygons System and method for drawing antialiased polygons

G - Physics

06

T

354/46

G06T 15/50 (2006.01)

Patent

CA 2030022

ABSTRACT OF THE DISCLOSURE A system (30) draws antialiased polygons. A CPU (32) is connected to a floating point processor (FPU) (34) by bus (36). The CPU (32) is connected by a 32-bit system bus (38) to a random access memory (RAM) (40), a cache (42) and an interface (44) in graphics subsystem (45). The interface (44) is connected by bus (46) to graphics processor (48). The graphics processor (48) is connected by 120-bit graphics bus (50) to frame buffer (52). The frame buffer (52) is connected to a video digital to analog converter (DAC) (54) by bus (56). The DAC (54) is connected to video display (58) by line (60). The graphics processor (48) use a technique known as super- sampling to combat the effects of aliasing. In aliased mode, the graphics processor (48) use 16 array sites to sample 16 pixels (72). When drawing a polygon or line in antialiased mode, the graphics processor (48) uses the 16 cites to sample at 16 locations (120) within a single pixel (72). The antialiasing is done by determining what proportion of the locations (120) within each pixel (72) are within the polygon and setting a color of each pixel (72) on the basic of the proportion. A-51575/TOH/WEH

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