From 2acdfcc95c317f30e725e17f0d372fce050830ef Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 6 Oct 2016 02:43:47 +0300
Subject: [PATCH] Receive events from OpenVR

---
 source/openvr/openvrsystem.cpp | 16 ++++++++++++++++
 source/openvr/openvrsystem.h   |  2 ++
 source/system.h                |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/source/openvr/openvrsystem.cpp b/source/openvr/openvrsystem.cpp
index 8c3188c..d631f48 100644
--- a/source/openvr/openvrsystem.cpp
+++ b/source/openvr/openvrsystem.cpp
@@ -101,6 +101,22 @@ OpenVRCombiner *OpenVRSystem::create_combiner(GL::View &v)
 	return new OpenVRCombiner(*this, v);
 }
 
+void OpenVRSystem::tick()
+{
+	vr::IVRSystem *vr_sys = vr::VRSystem();
+
+	vr::VREvent_t event;
+	while(vr_sys->PollNextEvent(&event, sizeof(event)))
+	{
+		if(event.eventType==vr::VREvent_TrackedDeviceActivated)
+			if(event.trackedDeviceIndex>=n_tracked_devices)
+			{
+				n_tracked_devices = event.trackedDeviceIndex+1;
+				tracking_matrices.resize(n_tracked_devices);
+			}
+	}
+}
+
 void OpenVRSystem::update_pose_matrices()
 {
 	vector<vr::TrackedDevicePose_t> poses;
diff --git a/source/openvr/openvrsystem.h b/source/openvr/openvrsystem.h
index ca5411e..119eb16 100644
--- a/source/openvr/openvrsystem.h
+++ b/source/openvr/openvrsystem.h
@@ -31,6 +31,8 @@ public:
 	virtual OpenVRCamera *create_camera(const GL::Camera &);
 	virtual OpenVRCombiner *create_combiner(GL::View &);
 
+	virtual void tick();
+
 	void update_pose_matrices();
 	const GL::Matrix &get_tracking_matrix(unsigned) const;
 	const GL::Matrix &get_hmd_matrix() const;
diff --git a/source/system.h b/source/system.h
index 69b93a1..b7187b9 100644
--- a/source/system.h
+++ b/source/system.h
@@ -29,6 +29,8 @@ public:
 	virtual bool get_absolute_tracking() const { return false; }
 	virtual HeadTrackingCamera *create_camera(const GL::Camera &) = 0;
 	virtual StereoCombiner *create_combiner(GL::View &) = 0;
+
+	virtual void tick() { }
 };
 
 } // namespace VR
-- 
2.43.0