XAA vs. EXA in old hardware support

[Daniel Stone]

On Tue, Jun 20, 2006 at 08:56:42AM +0100, Alan Cox wrote:
> Ar Llu, 2006-06-19 am 19:35 -0400, ysgrifennodd Adam Jackson:
> > EXA now decomposes line draws (and some other stuff) to iterated calls to the 
> > driver's Solid fill routine. 
> 
> That only helps for horizontal and vertical lines (and for older cards
> is generally slower there than writing to the frame buffer). Xtank is
> just a classic example of where hardware line draw should be used and
> why EXA should allow drivers to provide a line draw routine, at least
> for the non alpha case.

If all you were doing was playing xtank, then this would make sense.
But on normal desktops, it's a performance _loss_.  A seriously
noticeable loss.  If you really play xtank that much, you can use XAA,
surely.
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