> On Feb 22, 2021, at 14:38, Duncan Murdoch <murdoch.dun...@gmail.com> wrote: > > I've made a little bit of progress. > > The message "error: xp_attach_gl_context returned: 2" comes from the Mesa > routine surface_make_current, which calls xp_attach_gl_context. I haven't > found where xp_attach_gl_context is defined.
xp_attach_gl_context is in libXplugin (check Xplugin.h in the SDK). 2 is XP_BadValue, which is returned if cgl_ctx is NULL... so I'd suggest looking into why mesa is calling xp_attach_gl_context with a NULL context. > Secondly, the quartz() call in my example below starts several threads in R. > Execution of open3d() happens in the same thread with or without the quartz() > call, but the other threads in the process are quite different. I don't know > how this would affect things, but maybe I need to re-initialize everything > related to XQuartz. > > Duncan Murdoch > > > On 22/02/2021 10:13 a.m., Duncan Murdoch wrote: >> I hope this is the right list for this request. >> I'm the developer of the rgl package for R, which uses glX to produce >> displays in macOS and Linux. >> It contains some kind of bug, which can be triggered (in both XQuartz >> 2.7.11 and 2.8.0beta4) by the following script run in R in a terminal: >> library(rgl) # Load the package; it opens and closes a glX window >> # during initialization >> quartz() # Open a regular R graphics window that works directly >> # with Quartz >> open3d() # Attempt to open a glX window >> This produces the following errors: >> error: xp_attach_gl_context returned: 2 >> Error in rgl.open(useNULL) : 'rgl.open' failed >> In addition: Warning message: >> In rgl.open(useNULL) : RGL: ERROR: can't bind glx context to window >> The first line appears to be coming from XQuartz when the C++ code >> attempts to execute >> glXMakeCurrent(factory->xdisplay, xwindow, glxctx) >> in the X11WindowImpl::beginGL function. The other lines are coming from >> rgl or R. >> I'm reasonably sure this is a bug in my code, because I can successfully >> run glxgears from R, and open x11() windows in R, but after lots of time >> debugging I can't figure out where the problem is. >> Can anyone here suggest the kinds of issues that would lead to the >> "error: xp_attach_gl_context returned: 2" message, and ways to track >> down the underlying problem? >> If anyone wants to try the code, it's probably best to use the update of >> rgl that's at >> www.murdoch-sutherland.com/temp/rgl_0.105.14.2.tar.gz >> which fixes some bugs in the CRAN version. >> Duncan Murdoch > > > _______________________________________________ > Xquartz-dev mailing list > Xquartz-dev@lists.macosforge.org > https://lists.macosforge.org/mailman/listinfo/xquartz-dev >
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