[SDL] SDL in Linux with X window system

Vittorio G. vitto.giova at yahoo.it
Sat Jul 17 05:43:01 PDT 2010


Something is wrong with the vsync on mac os x 10.6 also, luckily
there's a workaround in coregraphics:
CGLSetParameter(CGLGetCurrentContext(), 222, @one);
I suggest that you open a bug like
http://bugzilla.libsdl.org/show_bug.cgi?id=1002 and maybe link yours
as a parent of mine.
bye
Vittorio

On Fri, Jul 16, 2010 at 11:25 AM, Christian Leger
<chrism.leger at gmail.com> wrote:
> Hi,
>
> I've worked on this very issue for a while, and have a possible solution.
> Look up the glXSwapIntervalSGI() function. As far as I know, it's not part
> of either SDL or the OpenGL standard, but is an extension provided by my
> NVIDIA drivers. Whether or not you can use the same or a similar function if
> you have ATI or integrated graphics is a mystery to me because all my
> machines happen to be NVIDIA. A similar function, wglSwapIntervalEXT, seems
> to do the exact same thing in windows, although requires more effort to be
> able to use it.
>
> Let us know if that helped!
>
> Christian
>
> On Tue, Jul 13, 2010 at 10:44 AM, Ollbert <ollbert at gmx.de> wrote:
>>
>> It is nice to have my programs run in Windows and Linux. SDL can help
>> here.
>>
>> There was one frustrating thing, when running a first example in linux: I
>> got tearing-effects and couldn't get rid of them for a few days.
>>
>> I read, that SDL doesn't support vsync in Linux, becouse X11 doesn't and
>> root rights would be requiered to get a direct hardware surface. And of
>> course, no app should run with root rights, if it doesn't really need to.
>>
>> There was another hint, that using OpenGL with SDL could help around that
>> problem. And it does! using double buffering within OpenGL enables vsync by
>> default. But, only if your Grafics-driver is setup to do that. And mine per
>> default was not.
>>
>> In the "NVIDIA X Server Settings > OpenGL Settings" I could setup "Sync to
>> VBlank" and after that: I could setup with
>> SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1); wheater or not I want to have
>> vsync. I think 1 is default. But it only helps, when your graphics-driver is
>> correctly setup. And I also read about graphic-drivers which don't support
>> this. I hope they are dying out.
>>
>> Maybe this helps someone.
>>
>> But I also have a question. Since I just start experimenting:
>> Are there other features, I would get problems within Linux?
>> Is it for some case bad to have no hardware-surface even with using
>> OpenGL?
>>
>> Greetings
>> Oliver
>> _______________________________________________
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>> SDL at lists.libsdl.org
>> http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org
>>
>
>
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