From ede4484b8d365f02c8cb8740e7ef11ce8dd95e24 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Fri, 23 Apr 2021 12:46:20 +0100
Subject: [PATCH] Particles: guard against duplicate init

---
 simgear/scene/model/particles.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/simgear/scene/model/particles.cxx b/simgear/scene/model/particles.cxx
index 7189e2bf..8dee9e7f 100644
--- a/simgear/scene/model/particles.cxx
+++ b/simgear/scene/model/particles.cxx
@@ -71,6 +71,7 @@ public:
     void registerNewWorldParticleSystem(osg::Node* node, ParticleSystemRef ps, osg::Group* frame);
 
     std::mutex _lock;
+    bool _inited = false;
     bool _frozen = false;
     double _simulationDt = 0.0;
     osg::ref_ptr<osg::Group> _commonRoot;
@@ -184,6 +185,10 @@ void ParticlesGlobalManager::ParticlesGlobalManagerPrivate::registerNewWorldPart
 void ParticlesGlobalManager::initFromMainThread()
 {
     std::lock_guard<std::mutex> g(d->_lock);
+    if (d->_inited)
+        return;
+
+    d->_inited = true;
     d->internalGetCommonRoot();
     d->_commonRoot->addUpdateCallback(d.get());
     d->_commonRoot->setCullingActive(false);