[FIXED!] tearing in sdl (GL) apps

kokoko3k · 2014-02-03 10:14:40

Problem:
If you have compositing extension enabled, sdl 1.2 based opengl apps will produce tearing unless you manage to disable backing store.

Causes:
* In the past SDL relied on the environment variable: SDL_VIDEO_X11_BACKINGSTORE to enable backing store functionalities.
* Now SDL asks X server if it supports backing store extension, and X server says "YES!" even if backing store is disabled in xorg.conf, but composite extension is enabled.

Solution:
The arch sdl package now has the patch, so this thread is useless.

Install https://aur.archlinux.org/packages/sdl-nobackingstore/
it will bring the environment variable functionality back into sdl and disable backing store by default.

~~if you want backingstore back, then run (before launching the sdl app):~~

export SDL_VIDEO_X11_BACKINGSTORE=1

~~if you want to disable it again, or you want to be sure it is disabled, run (before launching the sdl app):~~

unset SDL_VIDEO_X11_BACKINGSTORE

~~References:~~
~~https://devtalk.nvidia.com/default/topi … disabled-/~~
~~https://bugs.freedesktop.org/show_bug.cgi?id=74158~~
~~https://bugzilla.libsdl.org/show_bug.cgi?id=2383~~

Last edited by kokoko3k (2014-09-28 07:11:20)

minasmax · 2014-02-06 17:35:12

I can confirm that this works for me with XBMC.

Awebb · 2014-02-12 20:14:47

This does not work for me in xbmc. What am I doing wrong? I installed the patched packagepackage and set the variable in the .xinitrc before executing xbmc-standalone.

Vash63 · 2014-02-13 01:47:03

This works for me on Intel graphics with XBMC. Awebb, I believe having the variable enabled is similar to just not patching it - if you want to test the fix, don't set the variable or unset it if it's already set.

Awebb · 2014-02-13 21:46:57

Oh,you are right, I misread that part. This is what you get for fixing stuff, when it is time for you to be in bed

bleomycin · 2014-02-14 00:02:55

Thank you! This solved my xbmc tearing under intel! Is this a permanent solution or will I need to install sdl again at some point?

Awebb · 2014-02-14 10:35:07

Until SDL and/or X are fixed, you will need to patch and install SDL like this for every SDL update. I don't even know if there already is a bug report at either projects.

kokoko3k · 2014-02-14 16:31:36

I submitted this (just edited the first post):
https://bugzilla.libsdl.org/show_bug.cgi?id=2383
But by now nobody seems to care, maybe you could add youselves to the cc list...

hplgonzo · 2014-02-21 07:54:47

@kokoko3k

thanks a lot for this workaround.
i can finally use xbmc again.

kokoko3k · 2014-03-05 09:08:11

So, it seems that at least sdl wouldn't need an upgrade anymore.
The bug has been marked has wontfix because they don't have plans to release another 1.x sdl version.
But the fix will be in sdl 2.x release which will be compatible with the 1.x branch.

brebs · 2014-03-07 11:53:57

I see that the SDL_VIDEO_X11_BACKINGSTORE patch has gone into Fedora.

kokoko3k · 2014-03-08 13:33:11

https://bugs.archlinux.org/task/39227

Xenphor · 2014-03-17 19:47:47

This problem affects mame as well but the package fixed it.

Xenphor · 2014-05-13 07:08:53

I was wondering, does this also affect the 32 bit library as well? A lot of games use 32 bit libraries so that could be an issue.

firekage · 2014-05-13 09:15:27

Xenphor wrote:

This problem affects mame as well but the package fixed it.

I'm not an expert when it comes to patching system or kernel. I have a question - i need only to install this package from aur by yapurt -S <package name> and it will be fixed? In post number one this is the suggested metod. I would like to be sure of what i'm going to do.

Also, this tearing is in sdl apps - smplayer, for an exmaple? Video tearing?

Last edited by firekage (2014-05-13 09:17:02)

kokoko3k · 2014-05-13 10:30:43

@Xenphor:
When i did the package, i was on 32bit, so yes, it affects 32bit library too.

@firekage:
Yes, you just need to install the aur package.
smplayer can use sdl as a backend, so it may affect it too.

Xenphor · 2014-05-13 16:08:46

So is there a variable I can use to have the pkgbuild install the 32bit version as well or do I have to edit it somehow?

kokoko3k · 2014-05-13 16:23:03

Another PKGBUILD has to be made for lib32-sdl-nobackingstore by changing gcc parameters and library install path.
...i could try to make one in my spare time

-edit
Maybe tomorrow (maybe)

Last edited by kokoko3k (2014-05-13 16:24:14)

Xenphor · 2014-05-13 17:30:46

That's cool.

Last edited by Xenphor (2014-05-13 17:45:37)

kokoko3k · 2014-05-14 07:02:47

Here you go:
https://aur.archlinux.org/packages/lib3 … kingstore/

Xenphor · 2014-05-15 05:26:54

cool thanks.

kokoko3k · 2014-06-23 08:44:33

.

Last edited by kokoko3k (2014-06-28 11:35:30)

Arch Linux

#1 2014-02-03 10:14:40

[FIXED!] tearing in sdl (GL) apps

#2 2014-02-06 17:35:12

Re: [FIXED!] tearing in sdl (GL) apps

#3 2014-02-12 20:14:47

Re: [FIXED!] tearing in sdl (GL) apps

#4 2014-02-13 01:47:03

Re: [FIXED!] tearing in sdl (GL) apps

#5 2014-02-13 21:46:57

Re: [FIXED!] tearing in sdl (GL) apps

#6 2014-02-14 00:02:55

Re: [FIXED!] tearing in sdl (GL) apps

#7 2014-02-14 10:35:07

Re: [FIXED!] tearing in sdl (GL) apps

#8 2014-02-14 16:31:36

Re: [FIXED!] tearing in sdl (GL) apps

#9 2014-02-21 07:54:47

Re: [FIXED!] tearing in sdl (GL) apps

#10 2014-03-05 09:08:11

Re: [FIXED!] tearing in sdl (GL) apps

#11 2014-03-07 11:53:57

Re: [FIXED!] tearing in sdl (GL) apps

#12 2014-03-08 13:33:11

Re: [FIXED!] tearing in sdl (GL) apps

#13 2014-03-17 19:47:47

Re: [FIXED!] tearing in sdl (GL) apps

#14 2014-05-13 07:08:53

Re: [FIXED!] tearing in sdl (GL) apps

#15 2014-05-13 09:15:27

Re: [FIXED!] tearing in sdl (GL) apps

#16 2014-05-13 10:30:43

Re: [FIXED!] tearing in sdl (GL) apps

#17 2014-05-13 16:08:46

Re: [FIXED!] tearing in sdl (GL) apps

#18 2014-05-13 16:23:03

Re: [FIXED!] tearing in sdl (GL) apps

#19 2014-05-13 17:30:46

Re: [FIXED!] tearing in sdl (GL) apps

#20 2014-05-14 07:02:47

Re: [FIXED!] tearing in sdl (GL) apps

#21 2014-05-15 05:26:54

Re: [FIXED!] tearing in sdl (GL) apps

#22 2014-06-23 08:44:33

Re: [FIXED!] tearing in sdl (GL) apps

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