From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 3 Sep 2012 15:58:31 +0000 (+0300)
Subject: Add a method of getting the model matrix of a Renderable
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=f2592f0e67d92043952eb7a2e39df182720cd990

Add a method of getting the model matrix of a Renderable

This can be used for various position-dependent rendering techniques, such
as certain effects and frustum culling.
---

diff --git a/source/animatedobject.h b/source/animatedobject.h
index df0b15eb..6bcd37ce 100644
--- a/source/animatedobject.h
+++ b/source/animatedobject.h
@@ -26,6 +26,8 @@ public:
 	void set_matrix(const Matrix &);
 	void set_pose_matrix(unsigned, const Matrix &);
 
+	virtual const Matrix *get_matrix() const { return &matrix; }
+
 	virtual void setup_render(Renderer &, const Tag &) const;
 };
 
diff --git a/source/effect.h b/source/effect.h
index 7eeae682..7c943ae6 100644
--- a/source/effect.h
+++ b/source/effect.h
@@ -24,6 +24,8 @@ public:
 
 	void enable_for_pass(const Tag &);
 	void disable_for_pass(const Tag &);
+
+	virtual const Matrix *get_matrix() const { return renderable.get_matrix(); }
 };
 
 } // namespace GL
diff --git a/source/renderable.h b/source/renderable.h
index 2342ae28..3432a87e 100644
--- a/source/renderable.h
+++ b/source/renderable.h
@@ -7,6 +7,7 @@
 namespace Msp {
 namespace GL {
 
+class Matrix;
 class Renderer;
 
 /**
@@ -27,6 +28,10 @@ public:
 	returned value is treated as opaque. */
 	virtual long get_instance_key() const { return 0; }
 
+	/** Returns the model matrix of the Renderable.  Null is returned if no such
+	matrix exists. */
+	virtual const Matrix *get_matrix() const { return 0; }
+
 	/** Renders the renderable without a renderer.  This can be convenient in
 	some simple cases, but most renderables don't need to implement this
 	method. */