From 7da609f539040d11cccc61b838f4b74e06135552 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 27 Aug 2016 02:29:16 +0300
Subject: [PATCH] Do not attempt to unwatch a mesh that was already removed

---
 source/object.cpp | 20 ++++++++++++++++----
 source/object.h   |  2 ++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/source/object.cpp b/source/object.cpp
index f043f614..a27553a6 100644
--- a/source/object.cpp
+++ b/source/object.cpp
@@ -18,11 +18,13 @@ namespace Msp {
 namespace GL {
 
 Object::Object():
-	lods(1)
+	lods(1),
+	lod0_watched(false)
 { }
 
 Object::Object(const Mesh *m, const Technique *t):
-	lods(1)
+	lods(1),
+	lod0_watched(false)
 {
 	set_mesh(m);
 	set_technique(t);
@@ -30,7 +32,7 @@ Object::Object(const Mesh *m, const Technique *t):
 
 Object::~Object()
 {
-	if(lods[0].mesh)
+	if(lods[0].mesh && lod0_watched)
 		if(ResourceManager *rm = lods[0].mesh->get_manager())
 			rm->unwatch_resource(*lods[0].mesh, *this);
 }
@@ -51,15 +53,19 @@ Object::LevelOfDetail &Object::get_lod(unsigned i, const char *caller)
 void Object::set_mesh(unsigned i, const Mesh *m)
 {
 	RefPtr<const Mesh> &ptr = get_lod(i, "Object::set_mesh").mesh;
-	if(i==0 && ptr)
+	if(i==0 && ptr && lod0_watched)
 		if(ResourceManager *rm = ptr->get_manager())
 			rm->unwatch_resource(*ptr, *this);
 	ptr = m;
 	ptr.keep();
+	lod0_watched = false;
 
 	if(i==0 && m)
 		if(ResourceManager *rm = m->get_manager())
+		{
 			rm->watch_resource(*m, *this);
+			lod0_watched = true;
+		}
 
 	update_bounding_sphere();
 }
@@ -186,6 +192,12 @@ void Object::resource_loaded(Resource &res)
 		update_bounding_sphere();
 }
 
+void Object::resource_removed(Resource &res)
+{
+	if(&res==lods.front().mesh.get())
+		lod0_watched = false;
+}
+
 
 Object::Loader::Loader(Object &o):
 	LodLoader(o, 0, 0)
diff --git a/source/object.h b/source/object.h
index a11bfd9b..3d0415c6 100644
--- a/source/object.h
+++ b/source/object.h
@@ -72,6 +72,7 @@ private:
 
 	std::vector<LevelOfDetail> lods;
 	Geometry::BoundingSphere<float, 3> bounding_sphere;
+	bool lod0_watched;
 
 public:
 	Object();
@@ -122,6 +123,7 @@ private:
 	const RenderPass *get_pass(const Tag &, unsigned) const;
 
 	virtual void resource_loaded(Resource &);
+	virtual void resource_removed(Resource &);
 };
 
 } // namespace GL
-- 
2.43.0