The things I found more interesting in the issue of applting the TCL operations on all the vertices at once, or a vertice at each time. From previous discussions on this list it seems that nowadays most of CPU performace is dictated by the cache, so it really seems the later option is more efficient, but Mesa implements the former (they are even called "pipeline stages") and to change would mean a big overhaul of the TnL module.
Doing it in arrays is better from an instruction cache point of view, and as long as the arrays are small enough to fit in cache, there's no penalty from a data cache point of view.
That's the point of eg, the code in t_array_api.c which cuts large arrays up into 256-vertex chunks for processing by the tnl pipeline.
Keith
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