added functionality to use front mounted vive camera

jme3-vr/src/main/java/com/jme3/input/vr/OpenVR.java

@@ -18,6 +18,7 @@ import com.jme3.system.jopenvr.OpenVRUtil;
 import com.jme3.system.jopenvr.TrackedDevicePose_t;
 import com.jme3.system.jopenvr.VR_IVRCompositor_FnTable;
 import com.jme3.system.jopenvr.VR_IVRSystem_FnTable;
+import com.jme3.system.jopenvr.VR_IVRTrackedCamera_FnTable;
 import com.jme3.util.VRUtil;
 import com.sun.jna.Memory;
 import com.sun.jna.Pointer;
@@ -41,19 +42,20 @@ public class OpenVR implements VRAPI {
 	private static final Logger logger = Logger.getLogger(OpenVR.class.getName());
 	
     private static VR_IVRCompositor_FnTable compositorFunctions;
+    private static VR_IVRTrackedCamera_FnTable cameraFunctions;
     private static VR_IVRSystem_FnTable vrsystemFunctions;
     
     private static boolean initSuccess = false;
     private static boolean flipEyes    = false;
     
-    private IntBuffer hmdDisplayFrequency;
-    private TrackedDevicePose_t.ByReference hmdTrackedDevicePoseReference;
-    protected TrackedDevicePose_t[] hmdTrackedDevicePoses;
+    private static IntBuffer hmdDisplayFrequency;
+    private static TrackedDevicePose_t.ByReference hmdTrackedDevicePoseReference;
+    protected static TrackedDevicePose_t[] hmdTrackedDevicePoses;
     
-    protected IntByReference hmdErrorStore;
+    protected static IntByReference hmdErrorStore;
     
-    private final Quaternion rotStore = new Quaternion();
-    private final Vector3f posStore = new Vector3f();
+    private static final Quaternion rotStore = new Quaternion();
+    private static final Vector3f posStore = new Vector3f();
     
     private static FloatByReference tlastVsync;
     
@@ -65,21 +67,20 @@ public class OpenVR implements VRAPI {
     // for debugging latency
     private int frames = 0;    
     
-    protected Matrix4f[] poseMatrices;
+    protected static Matrix4f[] poseMatrices;
     
-    private final Matrix4f hmdPose = Matrix4f.IDENTITY.clone();
-    private Matrix4f hmdProjectionLeftEye;
-    private Matrix4f hmdProjectionRightEye;
-    private Matrix4f hmdPoseLeftEye;
-    private Matrix4f hmdPoseRightEye;
+    private static final Matrix4f hmdPose = Matrix4f.IDENTITY.clone();
+    private static Matrix4f hmdProjectionLeftEye;
+    private static Matrix4f hmdProjectionRightEye;
+    private static Matrix4f hmdPoseLeftEye;
+    private static Matrix4f hmdPoseRightEye;
     
-    private Vector3f hmdPoseLeftEyeVec, hmdPoseRightEyeVec, hmdSeatToStand;
-    
-    private float vsyncToPhotons;
-    private double timePerFrame, frameCountRun;
-    private long frameCount;
-    private OpenVRInput VRinput;
+    private static Vector3f hmdPoseLeftEyeVec, hmdPoseRightEyeVec, hmdSeatToStand;
     
+    private static float vsyncToPhotons;
+    private static double timePerFrame, frameCountRun;
+    private static long frameCount;
+    private static OpenVRInput VRinput;
     
     private VREnvironment environment = null;
     
@@ -107,6 +108,10 @@ public class OpenVR implements VRAPI {
         return compositorFunctions;
     }
     
+    public VR_IVRTrackedCamera_FnTable getTrackedCamera(){
+        return cameraFunctions;
+    }
+    
     @Override
     public String getName() {
         return "OpenVR";
@@ -235,6 +240,21 @@ public class OpenVR implements VRAPI {
         }
         return compositorFunctions != null;
     }
+    
+    public void initCamera(boolean allowed) {
+        hmdErrorStore.setValue(0); // clear the error store
+        if( allowed && vrsystemFunctions != null ) {
+        	IntByReference intptr = JOpenVRLibrary.VR_GetGenericInterface(JOpenVRLibrary.IVRTrackedCamera_Version, hmdErrorStore);
+                if (intptr != null){
+                    cameraFunctions = new VR_IVRTrackedCamera_FnTable(intptr.getPointer());
+                    if(cameraFunctions != null && hmdErrorStore.getValue() == 0 ){
+                        cameraFunctions.setAutoSynch(false);
+                        cameraFunctions.read();
+                        logger.config("OpenVR Camera initialized");
+                    }
+                }
+        }
+    }
 
     @Override
     public void destroy() {