From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 2 Jul 2018 21:00:28 +0000 (+0300)
Subject: Have Object provide an identity matrix from get_matrix
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=af0ba2af0167247bcda74e76f3c83c0c0e89650a

Have Object provide an identity matrix from get_matrix

It's often useful to have static geometry in a scene directly as an Object
without creating an instance.  Many features such as Z-sorting and culling
require a matrix to be available.
---

diff --git a/source/object.cpp b/source/object.cpp
index bdb292bb..1852f91b 100644
--- a/source/object.cpp
+++ b/source/object.cpp
@@ -17,6 +17,8 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+Matrix Object::identity_matrix;
+
 Object::Object():
 	lods(1),
 	lod0_watched(false)
diff --git a/source/object.h b/source/object.h
index c8e37260..48e30459 100644
--- a/source/object.h
+++ b/source/object.h
@@ -74,6 +74,8 @@ private:
 	Geometry::BoundingSphere<float, 3> bounding_sphere;
 	bool lod0_watched;
 
+	static Matrix identity_matrix;
+
 public:
 	Object();
 	Object(const Mesh *, const Technique *);
@@ -105,6 +107,7 @@ public:
 	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;