1. A computing device configured to shade graphics primitives using hybrid antialiasing, the computing device comprising: a rasterizer including a hybrid antialias control unit configured to receive the graphics primitives; determine a number of supersample clusters that are used to antialias each pixel that intersects the graphics primitives; determine a number of multisamples that are used to process the graphics primitives for each one of the supersample clusters; and a fragment shading unit coupled to the rasterizer and configured to shade the graphics primitives using multiple passes through the fragment shading unit, wherein the number of multiple passes used to produce each hybrid-antialiased pixel that intersects a graphics primitive is less than or equal to the number of supersample clusters.