[Bug 106053] Drawing at screen boundary is very slow.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106053

--- Comment #3 from Roland Scheidegger <sroland at vmware.com> ---
(In reply to Marek Olšák from comment #2)
> r300g on RC410 uses software emulation for vertex shaders and clipping (the
> same code as llvmpipe), because the hardware doesn't have any vertex
> processor and clipper.
Can't the chip do guardband clipping? I thought all radeon chips (starting from
r100) could do this, regardless if they support hw tnl.
I could be wrong though (and I wouldn't know how large the guardband would be,
and certainly draw's handling of guardband if you enable it is a bit lacking,
since hw has fixed limits whereas draw will use a guardband twice the size of
the viewport).

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