A system and method are disclosed for utilizing a Z slope test to select polygons
that may be candidates for multiple storage methods. The method may calculate the
absolute Z slope from vertex data and compare the calculated value with a specified
threshold value. In some embodiments, for polygons that have an absolute Z slope
less than the threshold value, parameter values may be rendered for only one sample
position of multiple neighboring sample positions. The parameter values rendered
for the one sample position may then be stored in multiple memory locations that
correspond to the multiple neighboring sample positions. In some embodiments, storing
parameter values in multiple memory locations may be achieved in a single write
transaction. In some embodiments, utilization of the Z slope test method may be
subject to user input and in other embodiments may be a dynamic decision controlled
by the graphics system.