* Prohibit DataContainer from storing DataHandles with empty name

* Introducing sigslot::signal::has_connections() to check whether a signal has listeners
* Fixed default OpenGL texture wrapping

Conflicts:
	modules/pipelinefactory.h

core/datastructures/datacontainer.cpp

@@ -25,6 +25,7 @@
 #include "datacontainer.h"
 
 #include "tgt/assert.h"
+#include "tgt/logmanager.h"
 #include "core/datastructures/abstractdata.h"
 
 namespace campvis {
@@ -41,14 +42,27 @@ namespace campvis {
     }
 
     DataHandle DataContainer::addData(const std::string& name, AbstractData* data) {
+        if (name.empty()) {
+            LERROR("Tried to add data with empty name to DataContainer.");
+            return DataHandle(0);
+        }
+
         tgtAssert(data != 0, "The Data must not be 0.");
+        tgtAssert(!name.empty(), "The data's name must not be empty.");
+
         DataHandle dh(data);
         addDataHandle(name, dh);
         return dh;
     }
 
     void DataContainer::addDataHandle(const std::string& name, const DataHandle& dh) {
+        if (name.empty()) {
+            LERROR("Tried to add data with empty name to DataContainer.");
+            return;
+        }
+
         tgtAssert(dh.getData() != 0, "The data in the DataHandle must not be 0!");
+        tgtAssert(!name.empty(), "The data's name must not be empty.");
         {
             //tbb::spin_mutex::scoped_lock lock(_localMutex);
             tbb::concurrent_unordered_map<std::string, DataHandle>::iterator it = _handles.find(name);

core/datastructures/imagerepresentationgl.cpp

@@ -186,7 +186,7 @@ namespace campvis {
         }
 
         _texture->uploadTexture();
-        _texture->setWrapping(tgt::Texture::CLAMP);
+        _texture->setWrapping(tgt::Texture::CLAMP_TO_EDGE);
 
         if (isInteger && isSigned) {
             // restore default

ext/sigslot/sigslot.h

@@ -458,6 +458,11 @@ namespace sigslot {
                 ++it;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -555,6 +560,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
         
     protected:
@@ -654,6 +664,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -753,6 +768,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -854,6 +874,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -957,6 +982,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -1060,6 +1090,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -1162,6 +1197,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;   
@@ -1265,6 +1305,11 @@ namespace sigslot {
                 it = itNext;
             }
         }
+
+        bool has_connections() const
+        {
+            return !m_connected_slots.empty();
+        }
         
     protected:
         connections_list m_connected_slots;