* Added String(FileExtension) property to ITerrainLoader to allow us to determine which file extension this loader is capable of handling.

* Added ITerrainLoader import capability to Terrain Plugins module - this allows you to write new terrain format plugins without modifying the terrain module directly.

OpenSim/Region/Environment/Modules/Terrain/FileLoaders/GenericSystemDrawing.cs

@@ -42,6 +42,11 @@ namespace OpenSim.Region.Environment.Modules.Terrain.FileLoaders
     {
         #region ITerrainLoader Members
 
+        public string FileExtension
+        {
+            get { return ".gsd"; }
+        }
+
         /// <summary>
         /// Loads a file from a specified filename on the disk,
         /// parses the image using the System.Drawing parsers

OpenSim/Region/Environment/Modules/Terrain/FileLoaders/JPEG.cs

@@ -36,6 +36,11 @@ namespace OpenSim.Region.Environment.Modules.Terrain.FileLoaders
     {
         #region ITerrainLoader Members
 
+        public string FileExtension
+        {
+            get { return ".jpg"; }
+        }
+
         public ITerrainChannel LoadFile(string filename)
         {
             throw new NotImplementedException();

OpenSim/Region/Environment/Modules/Terrain/FileLoaders/LLRAW.cs

@@ -132,6 +132,12 @@ namespace OpenSim.Region.Environment.Modules.Terrain.FileLoaders
             s.Close();
         }
 
+
+        public string FileExtension
+        {
+            get { return ".raw"; }
+        }
+
         #endregion
 
         public override string ToString()

OpenSim/Region/Environment/Modules/Terrain/FileLoaders/RAW32.cs

@@ -34,6 +34,11 @@ namespace OpenSim.Region.Environment.Modules.Terrain.FileLoaders
     {
         #region ITerrainLoader Members
 
+        public string FileExtension
+        {
+            get { return ".r32"; }
+        }
+
         public ITerrainChannel LoadFile(string filename)
         {
             TerrainChannel retval = new TerrainChannel();

OpenSim/Region/Environment/Modules/Terrain/FileLoaders/Terragen.cs

@@ -107,6 +107,11 @@ namespace OpenSim.Region.Environment.Modules.Terrain.FileLoaders
             throw new NotImplementedException();
         }
 
+        public string FileExtension
+        {
+            get { return ".ter"; }
+        }
+
         public ITerrainChannel LoadFile(string filename, int x, int y, int fileWidth, int fileHeight, int w, int h)
         {
             throw new NotImplementedException();

OpenSim/Region/Environment/Modules/Terrain/ITerrainLoader.cs

@@ -31,6 +31,7 @@ namespace OpenSim.Region.Environment.Modules.Terrain
 {
     public interface ITerrainLoader
     {
+        string FileExtension { get; }
         ITerrainChannel LoadFile(string filename);
         ITerrainChannel LoadFile(string filename, int fileStartX, int fileStartY, int fileWidth, int fileHeight, int sectionWidth, int sectionHeight);
         void SaveFile(string filename, ITerrainChannel map);

OpenSim/Region/Environment/Modules/Terrain/TerrainException.cs

@@ -31,15 +31,15 @@ namespace OpenSim.Region.Environment.Modules.Terrain
 {
     public class TerrainException : Exception
     {
-        public TerrainException(): base()
+        public TerrainException() : base()
         {
         }
 
-        public TerrainException(string msg): base(msg)
+        public TerrainException(string msg) : base(msg)
         {
         }
 
-        public TerrainException(string msg, Exception e): base(msg, e)
+        public TerrainException(string msg, Exception e) : base(msg, e)
         {
         }
     }

OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs

@@ -185,7 +185,8 @@ namespace OpenSim.Region.Environment.Modules.Terrain
                         {
                             m_log.Error(
                                 "[TERRAIN]: Unable to load heightmap, file not found. (A directory permissions error may also cause this)");
-                            throw new TerrainException(String.Format("unable to load heightmap: file {0} not found (or permissions do not allow access", filename));
+                            throw new TerrainException(
+                                String.Format("unable to load heightmap: file {0} not found (or permissions do not allow access", filename));
                         }
                     }
                     CheckForTerrainUpdates();
@@ -244,8 +245,20 @@ namespace OpenSim.Region.Environment.Modules.Terrain
                             if (pluginType.GetInterface("ITerrainEffect", false) != null)
                             {
                                 ITerrainEffect terEffect = (ITerrainEffect) Activator.CreateInstance(library.GetType(pluginType.ToString()));
-                                m_plugineffects.Add(pluginType.Name, terEffect);
+                                if (!m_plugineffects.ContainsKey(pluginType.Name))
-                                m_log.Info("... " + pluginType.Name);
+                                {
+                                    m_plugineffects.Add(pluginType.Name, terEffect);
+                                    m_log.Info("E ... " + pluginType.Name);
+                                } else
+                                {
+                                    m_log.Warn("E ... " + pluginType.Name + " (Already added)");
+                                }
+                            }
+                            else if (pluginType.GetInterface("ITerrainLoader", false) != null)
+                            {
+                                ITerrainLoader terLoader = (ITerrainLoader) Activator.CreateInstance(library.GetType(pluginType.ToString()));
+                                m_loaders[terLoader.FileExtension] = terLoader;
+                                m_log.Info("L ... " + pluginType.Name);
                             }
                         }
                         catch (AmbiguousMatchException)