X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fobjectinstance.h;h=6094517b6d5c062ca220b14e686e5dade8802335;hb=6afbace895a7bbcf216ab8e48280ea0303ab5892;hp=d665851fbb5d40fb0201d17c255ea8667572a04c;hpb=25c81b4953dd38993250321b9407ce8b0139cbeb;p=libs%2Fgl.git

diff --git a/source/objectinstance.h b/source/objectinstance.h
index d665851f..6094517b 100644
--- a/source/objectinstance.h
+++ b/source/objectinstance.h
@@ -1,10 +1,3 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007-2008, 2010-2011  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_GL_OBJETCINSTANCE_H_
 #define MSP_GL_OBJETCINSTANCE_H_
 
@@ -18,9 +11,12 @@ class Object;
 class ProgramData;
 
 /**
-Represents a single instance of an Object.  An application can derive another
-class from this and overload the hook functions to specify location and other
-instance-specific parameters for the rendered objects.
+Represents a single instance of an Object.  A derived class can overload the
+hook functions to specify a model matrix and other instance-specific parameters
+for the rendered objects.
+
+ObjectInstances can benefit from being put in an InstanceScene, which will
+render all instances of the same object consecutively.
 */
 class ObjectInstance: public Renderable
 {
@@ -31,6 +27,7 @@ public:
 	ObjectInstance(const Object &);
 
 	const Object &get_object() const { return object; }
+	virtual long get_instance_key() const { return reinterpret_cast<long>(&object); }
 
 	virtual void render(const Tag &tag = Tag()) const;
 	virtual void render(Renderer &, const Tag & = Tag()) const;
@@ -44,7 +41,7 @@ public:
 	anything. */
 	virtual void finish_render(Renderer &, const Tag &) const { }
 
-	virtual unsigned get_level_of_detail() const { return 0; }
+	virtual unsigned get_level_of_detail(const Renderer &) const { return 0; }
 };
 
 } // namespace GL