System and method of rendering polygons into a pixel grid

摘要

A graphics system includes a graphics controller for rendering polygons with a minimum number of steps and registers. The graphics controller includes a register file for receiving initial parameters for the polygon from a host. The graphics controller also includes a polygon engine for loading parameters from the register file and using these parameters to generate a starting X value for each scan line and a width value for each scan line to permit efficient rendering of the polygon without "edge walking" the polygon. The polygon engine includes a counter and a pair of accumulators for defining the number of orthogonal scan lines, the X start value for each scan line, and the width of each scan.