X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Frenderable.h;h=78879a3d8030fb15fcd41136c16ec7c831541972;hb=900cf40469972b1f32a6dbac95c42f46c3726fa8;hp=8e31d5a7ac79e0f4a379b581da4b68ef37823c05;hpb=25c81b4953dd38993250321b9407ce8b0139cbeb;p=libs%2Fgl.git

diff --git a/source/renderable.h b/source/renderable.h
index 8e31d5a7..78879a3d 100644
--- a/source/renderable.h
+++ b/source/renderable.h
@@ -1,10 +1,3 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007, 2011  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_GL_RENDERABLE_H_
 #define MSP_GL_RENDERABLE_H_
 
@@ -16,6 +9,10 @@ namespace GL {
 
 class Renderer;
 
+/**
+Base class for renderable objects.  All Renderables must support rendering with
+a Renderer, and may optionally provide support for standalone rendering.
+*/
 class Renderable
 {
 protected:
@@ -23,8 +20,11 @@ protected:
 public:
 	virtual ~Renderable() { }
 
+	/** Returns a key used for grouping Renderables in an InstanceScene. */
+	virtual long get_instance_key() const { return 0; }
+
 	virtual void render(const Tag & = Tag()) const;
-	virtual void render(Renderer &, const Tag & = Tag()) const;
+	virtual void render(Renderer &, const Tag & = Tag()) const = 0;
 };
 
 } // namespace Msp