added IUnknown::getReferenceCount and IMeshCache::clearUnusedMeshes to flush unused meshes from the mesh cache.

Fixed CGUIModalScreen, which I broke with the IGUIElement changes. Also fixed a small bug with the tooltip appearing directly under the mouse cursor.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@760 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -1,5 +1,11 @@
 Changes in version 1.4 (... 2007)
 
+ - Added IMeshCache::clearUnusedMeshes(). This allows the user to remove 
+   meshes that are sitting in the mesh cache but aren't used by any scene nodes. 
+   This is useful for example when changing levels.
+
+ - Added IUnknown::getReferenceCount()
+
  - createDevice now reports errors if the driverType is unknown, previously it 
    created a window but populated it with a null driver without any warning.
 

include/IMeshCache.h

@@ -112,8 +112,15 @@ namespace scene
 
 		//! Clears the whole mesh cache, removing all meshes.
 		/** All meshes will be reloaded completely when using ISceneManager::getMesh()
-		after calling this method. */
+		after calling this method. 
+		Warning: If you have pointers to meshes that were loaded with ISceneManager::getMesh() 
+		and you did not grab them, then they may become invalid. */
 		virtual void clear() = 0;
+
+		//! Clears all meshes that are held in the mesh cache but not used anywhere else.
+		/** Warning: If you have pointers to meshes that were loaded with ISceneManager::getMesh() 
+		and you did not grab them, then they may become invalid. */
+		virtual void clearUnusedMeshes() = 0;
 	};
 
 

include/IUnknown.h

@@ -123,13 +123,19 @@ namespace irr
 			return false;
 		}
 
+		//! Returns the reference counter.
+		s32 getReferenceCount() const
+		{
+			return ReferenceCounter;
+		}
+
 		//! Returns the debug name of the object. The Debugname may only be set and
 		//! changed by the object itself. This method should only be used in Debug mode.
 		//! \return Returns a string, previously set by setDebugName();
 		const c8* getDebugName() const
 		{
 			return DebugName;
-		} 
+		}
 
 	protected:
 

source/Irrlicht/CGUIEnvironment.cpp

@@ -328,7 +328,7 @@ void CGUIEnvironment::OnPostRender( u32 time )
 		dim.Width += getSkin()->getSize(EGDS_TEXT_DISTANCE_X)*2;
 		dim.Height += getSkin()->getSize(EGDS_TEXT_DISTANCE_Y)*2;
 
-		pos.UpperLeftCorner.Y -= dim.Height-1;
+		pos.UpperLeftCorner.Y -= dim.Height+1;
 		pos.LowerRightCorner.Y = pos.UpperLeftCorner.Y + dim.Height-1;
 		pos.LowerRightCorner.X = pos.UpperLeftCorner.X + dim.Width;
 

source/Irrlicht/CGUIModalScreen.cpp

@@ -43,6 +43,9 @@ bool CGUIModalScreen::OnEvent(SEvent event)
 			MouseDownTime = os::Timer::getTime();
 		}
 	}
+	
+	if (Parent)
+		Parent->OnEvent(event);
 
 	return true;	
 }

source/Irrlicht/CMeshCache.cpp

@@ -219,6 +219,21 @@ void CMeshCache::clear()
 	Meshes.clear();
 }
 
+//! Clears all meshes that are held in the mesh cache but not used anywhere else.
+void CMeshCache::clearUnusedMeshes()
+{
+	for (u32 i=0; i<Meshes.size(); ++i)
+	{
+		if (Meshes[i].Mesh->getReferenceCount() == 1)
+		{
+			Meshes[i].Mesh->drop();
+			Meshes.erase(i);
+			--i;
+		}
+	}
+}
+
+
 } // end namespace scene
 } // end namespace irr
 

source/Irrlicht/CMeshCache.h

@@ -92,6 +92,9 @@ namespace scene
 		//! Clears the whole mesh cache, removing all meshes.
 		virtual void clear();
 
+		//! Clears all meshes that are held in the mesh cache but not used anywhere else.
+		virtual void clearUnusedMeshes();
+
 	protected:
 
 		struct MeshEntry