X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fobject.h;h=48e3045930559fd354af6d868a935100a2fab09d;hp=bff41bf108e3f153fb6383f8fd09eb8dc91ec3bc;hb=49f1812b3e5ad73748015df52d0e4dee17246036;hpb=b617c5d7b5283ad260a77f01e42e6170cabbc03d

diff --git a/source/object.h b/source/object.h
index bff41bf1..48e30459 100644
--- a/source/object.h
+++ b/source/object.h
@@ -1,10 +1,3 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007-2008, 2010  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_GL_OBJECT_H_
 #define MSP_GL_OBJECT_H_
 
@@ -12,6 +5,7 @@ Distributed under the LGPL
 #include "bindable.h"
 #include "renderable.h"
 #include "renderpass.h"
+#include "resourceobserver.h"
 
 namespace Msp {
 namespace GL {
@@ -23,72 +17,114 @@ class Technique;
 class Texture;
 
 /**
-Stores a Mesh together with a Technique to determine its appearance.
+Combines a Mesh with a Technique to give it an appearance.  The Technique will
+define which render passes the Object supports.
 
-It is possible to use a single Object for rendering multiple identical or
-similar objects.  See class ObjectInstance.
+In many cases, it's desirable to include multiple copies of an Object in a
+Scene, with different model matrices.  ObjectInstances can be used to alter the
+rendering of an object on a per-instance basis.
+
+Objects can have multiple levels of detail.  The most detailed level has index
+0, with increasing indices having less detail.  When rendering an instance, the
+instance's get_level_of_detail method is called to determine which LoD to use.
 */
-class Object: public Renderable
+class Object: public Renderable, private ResourceObserver
 {
 private:
-	std::vector<Mesh *> meshes;
-	Technique *technique;
-	bool own_mesh:1;
-	bool own_technique:1;
+	struct LevelOfDetail;
+
+	class LodLoader: public DataFile::CollectionObjectLoader<Object>
+	{
+	private:
+		unsigned index;
+		LevelOfDetail &lod;
+
+	public:
+		LodLoader(Object &, unsigned, Collection *);
+
+	private:
+		void mesh(const std::string &);
+		void mesh_inline();
+		void technique(const std::string &);
+		void technique_inline();
+	};
 
 public:
-	class Loader: public DataFile::CollectionObjectLoader<Object>
+	class Loader: public LodLoader
 	{
 	public:
 		Loader(Object &);
 		Loader(Object &, Collection &);
 	private:
 		void init();
+		virtual void finish();
 
-	private:
-		void lod_mesh(unsigned, const std::string &);
-		void mesh();
-		void mesh(const std::string &);
-		void technique();
+		void bounding_sphere_hint(float, float, float, float);
+		void level_of_detail(unsigned);
 	};
 
+private:
+	struct LevelOfDetail
+	{
+		RefPtr<const Mesh> mesh;
+		RefPtr<const Technique> technique;
+	};
+
+	std::vector<LevelOfDetail> lods;
+	Geometry::BoundingSphere<float, 3> bounding_sphere;
+	bool lod0_watched;
+
+	static Matrix identity_matrix;
+
+public:
 	Object();
+	Object(const Mesh *, const Technique *);
 	~Object();
 
-	const Technique *get_technique() const { return technique; }
-
-	/**
-	Renders the object.  A tag can be provided to render a non-default pass.
-	*/
-	virtual void render(const Tag &tag = Tag()) const;
-
-	/**
-	Renders the object with an instance.  The instance's hook functions are
-	called before and after drawing the mesh.  A tag may also be given to render
-	a non-default pass.
-	*/
-	virtual void render(const ObjectInstance &, const Tag &tag = Tag()) const;
-
-	/**
-	Renders multiple instances of the object in one go.  This may improve
-	performance, as the object-specific render setup only has to be done once.
-	Each instance's hook functions will be called before and after drawing the
-	mesh.
-	*/
-	template<typename Iter>
-	void render(Iter begin, Iter end, const Tag &tag = Tag()) const
-	{
-		const RenderPass *pass = get_pass(tag);
-		if(!pass)
-			return;
-
-		Bind bind(*pass);
-		for(Iter i=begin; i!=end; ++i)
-			render_instance(**i, tag);
-	}
 private:
-	const RenderPass *get_pass(const Tag &) const;
-	void render_instance(const ObjectInstance &, const Tag &) const;
+	LevelOfDetail &get_lod(unsigned, const char *);
+
+public:
+	/** Sets the mesh for the highest level of detail (index 0). */
+	void set_mesh(const Mesh *m) { set_mesh(0, m); }
+
+	/** Sets the mesh for a given level of detail.  Previous LoDs must have been
+	defined. */
+	void set_mesh(unsigned, const Mesh *);
+
+private:
+	void update_bounding_sphere();
+public:
+	const Mesh *get_mesh(unsigned = 0) const;
+
+	/** Sets the technique for the highest level of detail (index 0). */
+	void set_technique(const Technique *t) { set_technique(0, t); }
+
+	/** Sets the technique for a given level of detail.  Previous LoDs must have
+	been defined. */
+	void set_technique(unsigned, const Technique *);
+
+	const Technique *get_technique(unsigned = 0) const;
+	unsigned get_n_lods() const { return lods.size(); }
+
+	virtual const Matrix *get_matrix() const { return &identity_matrix; }
+	virtual const Geometry::BoundingSphere<float, 3> *get_bounding_sphere() const { return &bounding_sphere; }
+
+	virtual void render(Renderer &, const Tag & = Tag()) const;
+
+	/** Renders an instance of the object.  The instance's hook functions are
+	called before and after drawing the mesh. */
+	virtual void render(Renderer &, const ObjectInstance &, const Tag & = Tag()) const;
+
+protected:
+	virtual void setup_render(Renderer &, const Tag &) const { }
+	virtual void finish_render(Renderer &, const Tag &) const { }
+
+private:
+	const RenderPass *get_pass(const Tag &, unsigned) const;
+
+	virtual void resource_loaded(Resource &);
+	virtual void resource_removed(Resource &);
 };
 
 } // namespace GL