[Bug 15334] Radeon EXA + Sampling off the edge of REPEAT_NONE sources

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Apr 14 08:08:18 PDT 2008


--- Comment #21 from Roland Scheidegger <sroland at tungstengraphics.com>  2008-04-14 08:08:17 PST ---
(In reply to comment #12)
> Created an attachment (id=15878)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15878) [details]
> Trial patch to use border color on R100/R200
> Here's a patch that tries using the border color on R100/R200 (taking
> the advantage of the fact that it is always ARGB in a fixed format.)
> However, it fails on R100 because the hardware doesn't seem smoothly blend
> with the border color using linear interpolation, but rather to 
> abruptly just use the border color for pixels near the edge.
Yes, I'm pretty sure this is a r100+r200 hardware limitation, apparently the hw
won't do bilinear filtering but use the border color without filtering for
these pixels if the sampling center is outside 0.0-1.0. You could use mesa's
tests/texwrap to see what all modes produce. Maybe such a border color sampling
was asked for (or is at least fully compliant) for d3d.

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