From 4c04337f46470180312812634beb0e39a04bcf9f Mon Sep 17 00:00:00 2001
From: Wim Vriend <facetracknoir@gmail.com>
Date: Fri, 26 Nov 2010 19:55:00 +0000
Subject: Changed update-sequence for FSX and FS2004. No data is written, if
 the headpose-data has not changed. This way, it is possible to use the
 HAT-switch, if tracking is OFF. The FTIRServer now also starts the dummy
 TrackIR.exe process, which is required by some clients, like EZCA.

git-svn-id: svn+ssh://svn.code.sf.net/p/facetracknoir/code@29 19e81ba0-9b1a-49c3-bd6c-561e1906d5fb
---
 FaceTrackNoIR/SCServer.cpp | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

(limited to 'FaceTrackNoIR/SCServer.cpp')

diff --git a/FaceTrackNoIR/SCServer.cpp b/FaceTrackNoIR/SCServer.cpp
index 30b0b2e9..fbbd92a3 100644
--- a/FaceTrackNoIR/SCServer.cpp
+++ b/FaceTrackNoIR/SCServer.cpp
@@ -76,6 +76,8 @@ importSimConnect_Open simconnect_open;							// SimConnect function(s) in DLL
 importSimConnect_Close simconnect_close;
 importSimConnect_CameraSetRelative6DOF simconnect_set6DOF;
 
+float prevPosX, prevPosY, prevPosZ, prevRotX, prevRotY, prevRotZ;
+
 	//
 	// Get the SimConnect_Open function from the DLL and use it!
 	//
@@ -97,6 +99,13 @@ importSimConnect_CameraSetRelative6DOF simconnect_set6DOF;
 
 	qDebug() << "SCServer::run() says: SimConnect functions resolved in DLL!";
 
+	prevPosX = 0.0f;
+	prevPosY = 0.0f;
+	prevPosZ = 0.0f;
+	prevRotX = 0.0f;
+	prevRotY = 0.0f;
+	prevRotZ = 0.0f;
+
 	forever
 	{
 	    // Check event for stop thread
@@ -122,10 +131,22 @@ importSimConnect_CameraSetRelative6DOF simconnect_set6DOF;
 			//
 			// Write the 6DOF-data to FSX
 			//
-			if (S_OK == simconnect_set6DOF(hSimConnect, virtPosX, virtPosY, virtPosZ, virtRotX, virtRotZ, virtRotY)) {
-//				qDebug() << "SCServer::run() says: SimConnect data written!";
+			// Only do this when the data has changed. This way, the HAT-switch can be used when tracking is OFF.
+			//
+			if ((prevPosX != virtPosX) || (prevPosY != virtPosY) || (prevPosZ != virtPosZ) ||
+				(prevRotX != virtRotX) || (prevRotY != virtRotY) || (prevRotZ != virtRotZ)) {
+				if (S_OK == simconnect_set6DOF(hSimConnect, virtPosX, virtPosY, virtPosZ, virtRotX, virtRotZ, virtRotY)) {
+//					qDebug() << "SCServer::run() says: SimConnect data written!";
+				}
 			}
 
+			prevPosX = virtPosX;
+			prevPosY = virtPosY;
+			prevPosZ = virtPosZ;
+			prevRotX = virtRotX;
+			prevRotY = virtRotY;
+			prevRotZ = virtRotZ;
+
 			// just for lower cpu load
 			msleep(15);	
 			yieldCurrentThread();
-- 
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