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revision 1.204 by tjl, Sun Dec 1 21:31:32 2002 UTC revision 1.205 by tjl, Sun Dec 1 21:35:14 2002 UTC
# Line 688  The shapes of the final background textu Line 688  The shapes of the final background textu
688  entirely from a small set of {\em basis textures}  entirely from a small set of {\em basis textures}
689  Even though the basis  Even though the basis
690  textures are RGB textures, they contain no color information:  textures are RGB textures, they contain no color information:
691  they are simply treated as 3-vectors to be used in  they are simply treated as 3- or 4-vectors to be used in
692  various ways to create shapes, and color is added  various ways to create shapes, and color is added
693  by the register combiners.  by the register combiners.
694    
# Line 860  This term can then be used to modulate b Line 860  This term can then be used to modulate b
860    
861  \subsection{Multi-pass}  \subsection{Multi-pass}
862    
863  Because there are only a few register combiner computation  Because there are only a two general register combiner
864  stages on NV10, a single rendering pass cannot  stages on the NV10 architecture, a single rendering pass cannot
865  produce a satisfactory background.  produce a satisfactory background texture.
 A simple way of increasing the visual features of the  
 backgrounds is to use multiple passes.  
   
866  The register combiners can be used to compute an alpha  The register combiners can be used to compute an alpha
867  value in the same way as the color interpolation values  value in the same way as the color interpolation values
868  and use it for blending shapes over the background drawn in the first pass.  and use it for blending over previous passes.
 This allows using features of different register combiner codes  
 in one background.  
869    
870  All the passes are assigned the same set of colors and  All the passes are assigned the same set of colors and
871  the same repeating unit(s) to make them blend into a  the same repeating unit(s) to make them blend into a

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