Xvfb problems

[James Courtier-Dutton]

Hi,

I have found out what the problem is with Xvfb.
Xvfb does not support GLX_SAMPLE_BUFFERS and GLX_SAMPLES.
If I comment them out, like below, Xvfb now works OK.
        int attribList[] = {
                GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
                GLX_RENDER_TYPE, GLX_RGBA_BIT,
                GLX_DOUBLEBUFFER, True,
                GLX_STEREO, False,
                GLX_TRANSPARENT_TYPE,
                GLX_NONE, GLX_RED_SIZE, 8,
                GLX_GREEN_SIZE, 8,
                GLX_BLUE_SIZE, 8,
                GLX_ALPHA_SIZE, 8,
                GLX_STENCIL_SIZE, 8,
                GLX_DEPTH_SIZE, 24,
//                GLX_SAMPLE_BUFFERS, 1,
//                GLX_SAMPLES, 2,
                None
        };

glXChooseFBConfig(dpy0, 0, attribList, &nitems);


For those using Java and using Processing with P2D or P3D, by default
it includes GLX_SAMPLE_BUFFERS and GLX_SAMPLES.
The way to stop Processing using them, is to add "noSmooth()" in the
settings section,
e.g
size(800,600,P2D);
noSmooth();

Xvfb is then compatible with Java P2D, P3D Processing functions.

I suppose the next question is, when will Xvfb or swrast start
supporting GLX_SAMPLE_BUFFERS?

Kind Regards

James




On 9 June 2017 at 18:50, James Courtier-Dutton <james.dutton at gmail.com> wrote:
> Hi,
>
> I have problems with Xvfb and an opengl client accessing it.
> The java client program uses "processing"   http://processing.org
>
> I think the problem might be the "300 GLXFBConfigs:" as output from
> glxinfo
>
> Not all the configs actually work.
> Where in the Xorg source code base are the fbconfigs defined?
> I would like to modify the code to reduce the 300 to a shorter list,
> that contains only ones that actually work.
> I cannot find where in the Xorg source code this config list is
> defined, or generated.
>
> If I can modify it, I could then attempt to fix the problem I am having.
> Essentially, I need to be able to build a version of "Xvfb" that actually works.
>
> Kind Regards
>
> James