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G4OSG viewer: render in the main thread on macOS (fixes SIGILL crash) #60

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Merged
tkittel merged 1 commit into from
Nov 7, 2026
Merged

G4OSG viewer: render in the main thread on macOS (fixes SIGILL crash) #60

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7 changes: 7 additions & 0 deletions src/simplebuild_dgcode/data/pkgs/G4/G4OSG/libsrc/Viewer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,13 @@ void G4OSG::Viewer::init()

compviewer->setKeyEventSetsDone(0);//no quit

#ifdef __APPLE__
//macOS: after a window resize (fullscreen toggle, user resize), osgViewer
//calls [NSOpenGLContext update] in the next makeCurrent, which AppKit only
//allows on the main thread. A draw thread (re)started by startThreading()
//then dies with SIGILL, so render in the main thread:
compviewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
#endif
m_viewer->setUpThreading();

// clear stencil buffer... (for outline FX)
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