| 摘要 |
<p>HIGH SPEED LINEAR SHADING IN A RASTER GRAPHIC SYSTEM A method and apparatus for linear shading of a polygon rendered in a raster graphics display is disclosed. Apparatus is included for selecting a key vertex which is located opposite to an edge of the polygon having a selected orientation. Apparatus is further included for dividing the polygon into a group of triangles so as to create a base leg for each of the triangles in the selected orientation. Apparatus is further included for calculating the horizontal endpoints and their associated luminance values for each scan line between each triangles base and the bases opposite vertex so as to describe a plurality of scan lines further comprising a plurality of pixels within each triangle. Apparatus for interpolating the luminance of each of the scan line pixels so as to shade each of the triangles completes the linear shading. In one embodiment of the invention, the pixel luminance values for several pixels can be simultaneously calculated resulting in greatly improved throughput as compared to known systems.</p> |
