From 697c2e06a90574c4526afe2d7d57edca099d2ceb Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 6 Oct 2016 20:08:51 +0300
Subject: [PATCH] Add a getter and signal to indicate if a controller is
 tracked

---
 Build                              | 1 +
 source/motioncontroller.h          | 4 ++++
 source/openvr/openvrcontroller.cpp | 2 ++
 source/openvr/openvrcontroller.h   | 1 +
 4 files changed, 8 insertions(+)

diff --git a/Build b/Build
index fa837ec..43581de 100644
--- a/Build
+++ b/Build
@@ -3,6 +3,7 @@ package "mspvr"
 	description "OpenGL-based virtual reality library";
 	version "0.1";
 
+	require "sigc++-2.0";
 	require "mspcore";
 	require "mspgl";
 	require "mspgui";
diff --git a/source/motioncontroller.h b/source/motioncontroller.h
index 9cdd622..959e056 100644
--- a/source/motioncontroller.h
+++ b/source/motioncontroller.h
@@ -11,6 +11,9 @@ class StereoView;
 
 class MotionController: public Input::Device
 {
+public:
+	sigc::signal<void, bool> signal_tracking_state_changed;
+
 protected:
 	StereoView *view;
 	Msp::GL::Matrix matrix;
@@ -21,6 +24,7 @@ public:
 
 	void attach_to_view(StereoView &);
 	void detach_from_view();
+	virtual bool is_tracked() const = 0;
 	const GL::Matrix &get_matrix() const { return matrix; }
 	virtual void update() = 0;
 protected:
diff --git a/source/openvr/openvrcontroller.cpp b/source/openvr/openvrcontroller.cpp
index 9ab957d..405cd2f 100644
--- a/source/openvr/openvrcontroller.cpp
+++ b/source/openvr/openvrcontroller.cpp
@@ -58,9 +58,11 @@ void OpenVRController::event(const Event &ev)
 	{
 	case vr::VREvent_TrackedDeviceActivated:
 		index = ev.trackedDeviceIndex;
+		signal_tracking_state_changed.emit(true);
 		break;
 	case vr::VREvent_TrackedDeviceDeactivated:
 		index = -1;
+		signal_tracking_state_changed.emit(false);
 		break;
 	case vr::VREvent_ButtonPress:
 		set_button_state(ev.data.controller.button, true, true);
diff --git a/source/openvr/openvrcontroller.h b/source/openvr/openvrcontroller.h
index 18c5774..00ae1c0 100644
--- a/source/openvr/openvrcontroller.h
+++ b/source/openvr/openvrcontroller.h
@@ -26,6 +26,7 @@ public:
 	virtual std::string get_axis_name(unsigned) const;
 
 	int get_index() const { return index; }
+	virtual bool is_tracked() const { return index>=0; }
 
 	void event(const Event &);
 	virtual void update();
-- 
2.43.0