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revision 1.205 by tjl, Sun Dec 1 21:35:14 2002 UTC revision 1.206 by tjl, Sun Dec 1 21:38:16 2002 UTC
# Line 858  This term can then be used to modulate b Line 858  This term can then be used to modulate b
858  }  }
859  \end{figure}  \end{figure}
860    
861  \subsection{Multi-pass}  \subsection{Multiple passes}
862    
863  Because there are only a two general register combiner  Because there are only two general register combiner
864  stages on the NV10 architecture, a single rendering pass cannot  stages on the NV10 architecture, a single rendering pass cannot
865  produce a satisfactory background texture.  produce a satisfactory background texture.
866  The register combiners can be used to compute an alpha  The register combiners can be used to compute a varying alpha
867  value in the same way as the color interpolation values  value and use it for blending over previous passes.
868  and use it for blending over previous passes.  The same color palette and repeating unit
869    are used for all passes.
 All the passes are assigned the same set of colors and  
 the same repeating unit(s) to make them blend into a  
 single perceived layer.  
870    
871  Currently, we use 3 passes on the NV10 and 2 passes on the NV25.  Currently, we use 3 passes on the NV10 and 2 passes on the NV25.
872    

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