[Mesa-users] mesa-users Digest, Vol 40, Issue 4

[Wonwoo Lee]

Hello Brian.

The code querying the renderer simply gives :
OSMesa Renderer = Mesa OffScreen

It is not clear whether my machine uses swrast or not.



By the way, I am trying to build Mesa 9.1.2 with OSMesa option.

./configure --enable-osmesa gives me the following results:

 OSMesa:          libOSMesa
 DRI drivers:     i915 i965 nouveau r200 radeon swrast
 DRI driver dir:  ${libdir}/dri
 GLX:             DRI-based

Does this configuration build OSMesa with llvmpipe you mentioned ?

Best regards,
Wonwoo



> Message: 2
> Date: Mon, 08 Jul 2013 16:19:00 -0600
> From: Brian Paul <brianp at vmware.com>
> To: mesa-users at lists.freedesktop.org
> Subject: Re: [Mesa-users] Rendering speed of OSMesa ?
> Message-ID: <51DB3AD4.6090204 at vmware.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> In your app, try printf("renderer = %s\n", (char *)
> glGetString(GL_RENDERER));
>
> I suspect you're using swrast.  I think you'd have to grab the latest
> Mesa from git to get the llvmpipe version of OSMesa.
>
> -Brian
>
> On 07/08/2013 03:40 PM, Wonwoo Lee wrote:
> > Hello Brian.
> >
> > I installed OSMesa on my ubuntu machine by using 'apt-get
> > install libosmesa6-dev'
> > glxinfo gives me : OpenGL version string: 2.1 Mesa 9.0.3
> > Regarding drivers, I have no idea because I'm not familiar with Mesa /
> > OSMesa libraries...
> > How do I check the driver I'm using ?
> >
> > Best,
> > Wonwoo Lee
> >
> >
> >>
> >> On 07/08/2013 12:26 AM, Wonwoo Lee wrote:
> >>> Hello.
> >>>
> >>> I tried OSMesa to render a simple scene where a textured rectangle and
> a
> >>> cylinder exist.
> >>> The size of render buffer was 640x480.
> >>>
> >>> I measured execution time of rendering several times. The speed of
> >>> rendering seems to depend on the number of pixels occupied by an object
> >>> in a rendered scene. Smaller object resulted in faster speed.
> >>
> >> That's usually how it works w/ software rendering.
> >>
> >>
> >>> My test results showed the rendering took about 20ms in average to
> >>> render a scene. It was much slower than I expected although it contains
> >>> a simple object.
> >>>
> >>> Is this a typical speed of OSMesa rendering ?
> >>
> >> Are you using the swrast driver?  Which version of Mesa?  I added
> >> support for using llvmpipe with OSMesa a few months ago.  That would
> >> give you the best performance.
> >>
> >> -Brian
> >
> >
>
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