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revision 1.200 by tjl, Sun Dec 1 21:20:45 2002 UTC revision 1.201 by tjl, Sun Dec 1 21:23:25 2002 UTC
# Line 749  This can be used to create a large varie Line 749  This can be used to create a large varie
749    
750  \subsection{Register combiners}  \subsection{Register combiners}
751    
752  After the texture accesses, we need to convert  Because
753  the 3- and 4-vectors obtained from the basis textures and  the unexteded OpenGL texture environment stage is inflexible,
754  % XXX: 4-vectors?  we use the NVIDIA register combiners extension
755  the palette color values into the final fragment color.  to combine the
756  The basic OpenGL texture environment stage is somewhat inadequate  the 3- and 4-vectors obtained from the basis textures
757  for this, so we use the NVIDIA register combiners extension  and
758  instead.  the palette colors into the final fragment color.
759    
760    
761  % Register combiners are used for fusing together the values read  % Register combiners are used for fusing together the values read
762  % from the basis textures and computing the fragment output color  % from the basis textures and computing the fragment output color

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