X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fshadowmap.h;h=11407462c3e1922c48cd9bb0b3725829e207f595;hb=8c24084524198e23d65058454001ffb0bf20e94f;hp=17e17ca9ce940344713c558f8339d9c809fdef92;hpb=41339bc44d076569c680b2c24c75b30ef1254c1b;p=libs%2Fgl.git

diff --git a/source/shadowmap.h b/source/shadowmap.h
index 17e17ca9..11407462 100644
--- a/source/shadowmap.h
+++ b/source/shadowmap.h
@@ -1,10 +1,3 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2009  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef SHADOWMAP_H_
 #define SHADOWMAP_H_
 
@@ -19,24 +12,36 @@ namespace GL {
 class Light;
 class Scene;
 
+/**
+Creates shadows on a Scene through a shadow map texture.  In the preparation
+phase, the scene is rendered to a depth texture from the point of view of the
+lightsource.  This texture is then used in the rendering phase together with
+texture coordinate generation to determine whether each fragment is lit.
+*/
 class ShadowMap: public Effect
 {
 private:
 	unsigned size;
-	const Scene &scene;
 	const Light &light;
-	Framebuffer fbo;
-public:
+	mutable Framebuffer fbo;
+	unsigned unit;
 	Texture2D depth_buf;
-private:
 	Vector3 target;
 	float radius;
 
 public:
-	ShadowMap(unsigned, const Scene &, const Light &);
+	ShadowMap(unsigned, const Renderable &, const Light &);
+
+	/** Sets the ShadowMap target point and radius.  The transformation matrix is
+	computed so that a sphere with the specified parameters will be completely
+	covered by the ShadowMap. */
 	void set_target(const Vector3 &, float);
-	virtual void prepare();
-	virtual void cleanup();
+
+	/** Sets the texture unit to bind the shadow map to during the rendering
+	phase.  The default is texture unit 3. */
+	void set_texture_unit(unsigned);
+
+	virtual void render(Renderer &, const Tag &) const;
 };
 
 } // namespace GL