Performs Multipass Antialiasing. The algorithm computes multiple samples distributed around each display pixel and weights (filters) these into one final value

• A screen space offset is added to the transformed vertex coordinates of each triangle to produce the sample distribution.

• A 6x3 table specifies the filter offsets and weights. Offsets are fractional pixel shifts and the sum of all the weights = 1.0.

• Application sets up multiple Renderers and Displays -- one pair for each sample in the table.

• Each Renderer is initialized with a different offset and display to write into.

• All triangles are sent to all renderers.

• After rendering all the triangles, the application combines the multiple display images by weighting their pixel values.

• The filtered (result) image is stored in one of the displays (or a new one) and then written to disk.

• Also the filtered image is stored in the frame buffer to window draw.