From c895aa82dd405146f648e5ca3fcfaa326eab9b87 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 5 Jul 2018 21:29:29 +0300
Subject: [PATCH 1/1] Add a utility class for switching renderables

---
 source/slot.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 source/slot.h   | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 source/slot.cpp
 create mode 100644 source/slot.h

diff --git a/source/slot.cpp b/source/slot.cpp
new file mode 100644
index 00000000..07dabf07
--- /dev/null
+++ b/source/slot.cpp
@@ -0,0 +1,45 @@
+#include <msp/gl/renderer.h>
+#include "slot.h"
+
+namespace Msp {
+namespace GL {
+
+Slot::Slot():
+	renderable(0)
+{ }
+
+void Slot::set(Renderable *r)
+{
+	renderable = r;
+}
+
+const Matrix *Slot::get_matrix() const
+{
+	return renderable ? renderable->get_matrix() : 0;
+}
+
+const Geometry::BoundingSphere<float, 3> *Slot::get_bounding_sphere() const
+{
+	return renderable ? renderable->get_bounding_sphere() : 0;
+}
+
+void Slot::setup_frame(Renderer &renderer)
+{
+	if(renderable)
+		renderable->setup_frame(renderer);
+}
+
+void Slot::finish_frame()
+{
+	if(renderable)
+		renderable->finish_frame();
+}
+
+void Slot::render(Renderer &renderer, const Tag &tag) const
+{
+	if(renderable)
+		renderer.render(*renderable, tag);
+}
+
+} // namespace GL
+} // namespace Msp
diff --git a/source/slot.h b/source/slot.h
new file mode 100644
index 00000000..ad863017
--- /dev/null
+++ b/source/slot.h
@@ -0,0 +1,34 @@
+#ifndef MSP_GL_SLOT_H_
+#define MSP_GL_SLOT_H_
+
+#include "renderable.h"
+
+namespace Msp {
+namespace GL {
+
+/**
+A container for a single renderable.  Can be used if a part of the scene graph
+needs to be switched without affecting the rest.
+*/
+class Slot: public Renderable
+{
+private:
+	Renderable *renderable;
+
+public:
+	Slot();
+
+	void set(Renderable *);
+	Renderable *get() const { return renderable; }
+
+	virtual const Matrix *get_matrix() const;
+	virtual const Geometry::BoundingSphere<float, 3> *get_bounding_sphere() const;
+	virtual void setup_frame(Renderer &);
+	virtual void finish_frame();
+	virtual void render(Renderer &, const Tag &) const;
+};
+
+} // namespace GL
+} // namespace Msp
+
+#endif
-- 
2.43.0