Adapt ISWAManager and KameleonWrapper to removal of singleton

modules/iswa/util/iswamanager.cpp

@@ -94,6 +94,8 @@ namespace {
 
 namespace openspace {
 
+IswaManager* IswaManager::_instance = nullptr;
+
 IswaManager::IswaManager()
     : properties::PropertyOwner({ "IswaManager" })
     , _baseUrl("https://iswa-demo-server.herokuapp.com/")
@@ -118,6 +120,27 @@ IswaManager::~IswaManager() {
     _cygnetInformation.clear();
 }
 
+
+void IswaManager::initialize() {
+    ghoul_assert(!isInitialized(), "IswaManager is already initialized");
+    _instance = new IswaManager;
+}
+
+void IswaManager::deinitialize() {
+    ghoul_assert(isInitialized(), "IswaManager is not initialized");
+    delete _instance;
+    _instance = nullptr;
+}
+
+bool IswaManager::isInitialized() {
+    return _instance != nullptr;
+}
+
+IswaManager& IswaManager::ref() {
+    ghoul_assert(isInitialized(), "IswaManager is not initialized");
+    return *_instance;
+}
+
 void IswaManager::addIswaCygnet(int id, const std::string& type, std::string group) {
     if (id > 0) {
         createScreenSpace(id);

modules/iswa/util/iswamanager.h

@@ -26,7 +26,6 @@
 #define __OPENSPACE_MODULE_ISWA___ISWAMANAGER___H__
 
 #include <openspace/properties/propertyowner.h>
-#include <ghoul/designpattern/singleton.h>
 
 #include <openspace/engine/downloadmanager.h>
 #include <ghoul/designpattern/event.h>
@@ -68,10 +67,7 @@ struct MetadataFuture {
     bool isFinished;
 };
 
-class IswaManager : public ghoul::Singleton<IswaManager>, public properties::PropertyOwner
-{
-    friend class ghoul::Singleton<IswaManager>;
-
+class IswaManager : public properties::PropertyOwner {
 public:
     enum CygnetType { Texture, Data, Kameleon, NoType };
     enum CygnetGeometry { Plane, Sphere };
@@ -79,6 +75,11 @@ public:
     IswaManager();
     ~IswaManager();
 
+    static void initialize();
+    static void deinitialize();
+    static bool isInitialized();
+    static IswaManager& ref();
+
     void addIswaCygnet(int id, const std::string& type = "Texture",
         std::string group = "");
     void addKameleonCdf(std::string group, int pos);
@@ -127,6 +128,8 @@ private:
     ghoul::Event<> _iswaEvent;
 
     std::string _baseUrl;
+
+    static IswaManager* _instance;
 };
 
 } //namespace openspace

modules/kameleon/src/kameleonwrapper.cpp

@@ -29,6 +29,7 @@
 #include <ghoul/logging/logmanager.h>
 #include <ghoul/fmt.h>
 #include <ghoul/glm.h>
+#include <ghoul/misc/assert.h>
 #include <ghoul/misc/misc.h>
 
 #ifdef WIN32