From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 25871] nearest neighbour samples wrong texel (precision/rounding problem)
Date: Wed, 12 Sep 2012 13:03:19 +0000 [thread overview]
Message-ID: <bug-25871-502-M715oPZQ2F@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-25871-502@http.bugs.freedesktop.org/>
https://bugs.freedesktop.org/show_bug.cgi?id=25871
--- Comment #10 from Pierre Ossman <pierre-bugzilla@ossman.eu> 2012-09-12 13:03:19 UTC ---
(In reply to comment #7)
>
> What is the expected behavior?
It's so long ago I don't remember the exact details. You can easily figure it
out though. The test program creates a 4x4 checker board texture and then uses
a single point on it to draw the triangles. The range [0.25,0.5[ should all be
the same color. The bug was that as you approached 0.5, it started sampling the
next pixel prematurely.
So change the fragment program to use coordinate 0.4 or something like that.
That colour should be the same as 0.4999... . Looking at the code, white seems
to be the correct colour.
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next prev parent reply other threads:[~2012-09-12 13:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-03 13:01 [Bug 25871] New: nearest neighbour samples wrong texel (precision/rounding problem) bugzilla-daemon
2010-01-04 21:48 ` [Bug 25871] " bugzilla-daemon
2010-01-04 21:49 ` bugzilla-daemon
2011-03-01 2:27 ` bugzilla-daemon
2011-03-01 2:56 ` bugzilla-daemon
2012-09-11 11:32 ` bugzilla-daemon
2012-09-11 13:51 ` bugzilla-daemon
2012-09-11 17:12 ` bugzilla-daemon
2012-09-11 17:23 ` bugzilla-daemon
2012-09-12 12:34 ` bugzilla-daemon
2012-09-12 13:03 ` bugzilla-daemon [this message]
2012-09-12 13:56 ` bugzilla-daemon
2014-04-13 10:46 ` bugzilla-daemon
2014-04-13 20:40 ` bugzilla-daemon
2014-04-13 22:39 ` bugzilla-daemon
2014-04-16 8:13 ` bugzilla-daemon
2014-04-16 15:15 ` bugzilla-daemon
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