Restored glass model that implements the uv shift.

Added a way to register built-in models to support this.

src/main/java/appeng/client/render/model/BuiltInModelLoader.java

@@ -0,0 +1,58 @@
+package appeng.client.render.model;
+
+
+import java.util.Map;
+
+import com.google.common.collect.ImmutableMap;
+
+import net.minecraft.client.resources.IResourceManager;
+import net.minecraft.client.resources.IResourceManagerReloadListener;
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.client.model.ICustomModelLoader;
+import net.minecraftforge.client.model.IModel;
+
+import appeng.core.AppEng;
+
+
+/**
+ * Manages built-in models.
+ */
+public class BuiltInModelLoader implements ICustomModelLoader
+{
+
+	private final Map<String, IModel> builtInModels;
+
+	public BuiltInModelLoader( Map<String, IModel> builtInModels )
+	{
+		this.builtInModels = ImmutableMap.copyOf( builtInModels );
+	}
+
+	@Override
+	public boolean accepts( ResourceLocation modelLocation )
+	{
+		if( !modelLocation.getResourceDomain().equals( AppEng.MOD_ID ) )
+		{
+			return false;
+		}
+
+		return builtInModels.containsKey( modelLocation.getResourcePath() );
+	}
+
+	@Override
+	public IModel loadModel( ResourceLocation modelLocation ) throws Exception
+	{
+		return builtInModels.get( modelLocation.getResourcePath() );
+	}
+
+	@Override
+	public void onResourceManagerReload( IResourceManager resourceManager )
+	{
+		for( IModel model : builtInModels.values() )
+		{
+			if( model instanceof IResourceManagerReloadListener )
+			{
+				( (IResourceManagerReloadListener) model ).onResourceManagerReload( resourceManager );
+			}
+		}
+	}
+}