From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 32511] New: glDrawPixels broken on savage
Date: Sun, 19 Dec 2010 13:11:57 -0800 (PST) [thread overview]
Message-ID: <bug-32511-502@http.bugs.freedesktop.org/> (raw)
https://bugs.freedesktop.org/show_bug.cgi?id=32511
Summary: glDrawPixels broken on savage
Product: Mesa
Version: git
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/Savage
AssignedTo: dri-devel@lists.freedesktop.org
ReportedBy: bugzi09.fdo.tormod@xoxy.net
Created an attachment (id=41267)
--> (https://bugs.freedesktop.org/attachment.cgi?id=41267)
full backtrace in savageWriteRGBASpan_565()
The drawpix demo draws pixels spread around the screen instead of inside the
window. Each line drawn (194 pixels) get displayed in a cluster, but not as a
line. Only every 6th "line" get displayed, starting from the lower right of the
screen, going left, then up (see drawpix-many.png).
The cluster is divided in 4 squares of 8 times 8 pixels, where the first and
fourth square is not complete. Each square is drawn from left to right, then
from top to bottom. Square are drawn from left to right within a cluster. (See
drawpix-line.png).
I have tracked the drawing in mesa down to where it writes each pixel into the
renderbuffer in savageWriteRGBASpan_565(), see the full backtrace in
write_rgba-backtrace.gdb.
This is with latest git. I think I have seen similar corruption using the
antspotlight screensaver since a long time ago, and I never tried drawpix
before so this can be an old bug. The bug reporter of the downstream Ubuntu bug
says drawpix worked fine in Ubuntu 8.04 which had mesa 7.0.3.
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next reply other threads:[~2010-12-19 21:11 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-19 21:11 bugzilla-daemon [this message]
2010-12-19 21:13 ` [Bug 32511] glDrawPixels broken on savage bugzilla-daemon
2010-12-19 21:14 ` bugzilla-daemon
2010-12-19 21:15 ` bugzilla-daemon
2010-12-19 21:18 ` bugzilla-daemon
2010-12-20 18:34 ` bugzilla-daemon
2010-12-20 18:53 ` bugzilla-daemon
2010-12-22 0:39 ` bugzilla-daemon
2011-01-06 23:01 ` bugzilla-daemon
2011-01-06 23:15 ` bugzilla-daemon
2011-01-06 23:31 ` bugzilla-daemon
2011-01-08 12:09 ` bugzilla-daemon
2011-01-08 22:40 ` bugzilla-daemon
2011-01-09 12:42 ` bugzilla-daemon
2011-01-17 21:57 ` bugzilla-daemon
2011-01-25 19:23 ` bugzilla-daemon
2011-02-12 12:13 ` bugzilla-daemon
2011-04-03 21:43 ` bugzilla-daemon
2011-04-05 14:53 ` bugzilla-daemon
2011-06-14 21:32 ` bugzilla-daemon
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