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List: kwin
Subject: Re: Review Request: invoke glXSwapInterval to actually inform the buffer that we want to align to vb
From: Martin_Gräßlin <kde () martin-graesslin ! com>
Date: 2012-02-29 14:26:00
Message-ID: 20120229142600.6304.94114 () vidsolbach ! de
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http://git.reviewboard.kde.org/r/104111/#review11018
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Do I understand correctly that it is about this extension: \
http://www.opengl.org/registry/specs/SGI/swap_control.txt
If yes I must admit that my brain is today in no condition to understand what it \
talks about ;-)
- Martin Gräßlin
On Feb. 28, 2012, 10:08 p.m., Thomas Lübking wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/104111/
> -----------------------------------------------------------
>
> (Updated Feb. 28, 2012, 10:08 p.m.)
>
>
> Review request for kwin and Martin Gräßlin.
>
>
> Description
> -------
>
> Believe it or not, but there's actually a glXSwapInterval function and as far as i \
> could figure one should use it since i found contradicting claims about the default \
> (some mesa guy in a mailing list entry from 2006 says it's 0, while \
> http://www.opengl.org/registry/specs/SGI/swap_control.txt suggests it's one)
> However it can't harm -hopefully- and works here on nvidia and GMA/mesa (nvidia has \
> SGI & ext, mesa has MESA and OML - d'ooohh) and *might* be the cause of wonky \
> swapping because if it's not set the color buffer flushes whenever it feels like \
> what can cause waitSync to block for even a random amount of frames or not at all \
> (causing tearing) - at least says the guy from 2006 and is supported by the reply \
> of the guy who originally asked =D
>
> Diffs
> -----
>
> kwin/libkwineffects/kwinglutils_funcs.h 97a7a6c
> kwin/libkwineffects/kwinglutils_funcs.cpp 6d79507
> kwin/scene_opengl_glx.cpp ddebcd0
>
> Diff: http://git.reviewboard.kde.org/r/104111/diff/
>
>
> Testing
> -------
>
> It's detected and applied, not 100% sure about the resulting impact.
>
>
> Thanks,
>
> Thomas Lübking
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/104111/">http://git.reviewboard.kde.org/r/104111/</a>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Do I understand \
correctly that it is about this extension: \
http://www.opengl.org/registry/specs/SGI/swap_control.txt
If yes I must admit that my brain is today in no condition to understand what it \
talks about ;-)</pre> <br />
<p>- Martin</p>
<br />
<p>On February 28th, 2012, 10:08 p.m., Thomas Lübking wrote:</p>
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<div>Review request for kwin and Martin Gräßlin.</div>
<div>By Thomas Lübking.</div>
<p style="color: grey;"><i>Updated Feb. 28, 2012, 10:08 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">Believe it or not, but there's actually a glXSwapInterval function \
and as far as i could figure one should use it since i found contradicting claims \
about the default (some mesa guy in a mailing list entry from 2006 says it's 0, \
while http://www.opengl.org/registry/specs/SGI/swap_control.txt suggests it's \
one)
However it can't harm -hopefully- and works here on nvidia and GMA/mesa (nvidia \
has SGI & ext, mesa has MESA and OML - d'ooohh) and *might* be the cause of \
wonky swapping because if it's not set the color buffer flushes whenever it feels \
like what can cause waitSync to block for even a random amount of frames or not at \
all (causing tearing) - at least says the guy from 2006 and is supported by the reply \
of the guy who originally asked =D</pre> </td>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">It's detected and applied, not 100% sure about the resulting \
impact.</pre> </td>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>kwin/libkwineffects/kwinglutils_funcs.h <span style="color: \
grey">(97a7a6c)</span></li>
<li>kwin/libkwineffects/kwinglutils_funcs.cpp <span style="color: \
grey">(6d79507)</span></li>
<li>kwin/scene_opengl_glx.cpp <span style="color: grey">(ddebcd0)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/104111/diff/" style="margin-left: \
3em;">View Diff</a></p>
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