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/*
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
/**
* This object contains a specification of the physical environment in
* which the view will be generated. It is used to set up input
* devices (sensors) for head-tracking and other uses, and the audio
* output device. Sensors are indexed starting at zero.
*
* @see View
*/
public class PhysicalEnvironment extends Object {
/**
* The Sensor Index associated with the Head
*/
int HeadIndex = 0;
// The Sensor index associated with the Right Hand
int RightHandIndex = 1;
// The Sensor index associated with the Left Hand
int LeftHandIndex = 2;
// The current Dominant Hand Sensor Index
int DominantHandIndex = 1;
// The current Non Dominant Hand Sensor Index
int NonDominantHandIndex = 2;
//
// Coexistence coordinate system to tracker-base coordinate
// system transform. If head tracking is enabled, this transform
// is a calibration constant. If head tracking is not enabled,
// this transform is not used.
// This is used in both SCREEN_VIEW and HMD_VIEW modes.
//
Transform3D coexistenceToTrackerBase = new Transform3D();
//
// Indicates whether the underlying hardware implementation
// supports tracking.
//
boolean trackingAvailable = false;
// The view associated with this physical environment
// View view;
//
// This variable specifies the policy Java 3D will use in placing
// the user's eye position relative to the user's head position
// (NOMINAL_SCREEN, NOMINAL_HEAD, or NOMINAL_FEET).
// It is used in the calibration process.
//
// TODO: this needs better explanation in the spec
int coexistenceCenterInPworldPolicy = View.NOMINAL_SCREEN;
// Mask that indicates this PhysicalEnv's view dependence info. has changed,
// and CanvasViewCache may need to recompute the final view matries.
int peDirtyMask = (View.PE_COE_TO_TRACKER_BASE_DIRTY
| View.PE_TRACKING_AVAILABLE_DIRTY
| View.PE_COE_CENTER_IN_PWORLD_POLICY_DIRTY);
//// /**
//// * The offset in the user's dominant-hand-tracker coordinates
//// * to that hand's hot spot. This value is a calibration constant.
//// */
//// Vector3d dominantHandTrackerHotspotOffset;
////
//// /**
//// * The offset in the user's non-dominant-hand-tracker coordinates
//// * to that hand's hot spot. This value is a calibration constant.
//// */
//// Vector3d nondominantHandTrackerHotspotOffset;
//
// The number of sensor stored within the PhysicalEnvironment
//
int sensorCount;
//
// Array of sensors
//
Sensor[] sensors;
// Audio device associated with this PhysicalEnvironment
AudioDevice audioDevice = null;
boolean sensorListChanged = false;
Sensor[] sensorList = null;
// A list of View Objects that refer to this
ArrayList users = new ArrayList();
// Scheduler for input devices
InputDeviceScheduler inputsched;
// store all inputDevices
Vector devices = new Vector(1);
// Number of active view users
int activeViewRef = 0;
// Hashtable that maps a PhysicalEnvironment to its InputDeviceScheduler
static final Hashtable physicalEnvMap;
static {
physicalEnvMap = new Hashtable();
}
/**
* Constructs a PhysicalEnvironment object with default parameters.
* The default values are as follows:
*
* sensor count : 3
* sensors : null (for all array elements)
* head index : 0
* right hand index : 1
* left hand index : 2
* dominant hand index : 1
* nondominant hand index : 2
* tracking available : false
* audio device : null
* input device list : empty
* coexistence to tracker base transform : identity
* coexistence center in pworld policy : View.NOMINAL_SCREEN
*
*/
public PhysicalEnvironment() {
this(3);
}
// Add a user to the list of users
synchronized void removeUser(View view) {
users.remove(view);
}
// Add a user to the list of users
synchronized void addUser(View view) {
if (!users.contains(view))
users.add(view);
}
// Add a user to the list of users
synchronized void notifyUsers() {
for (int i = users.size() - 1; i >= 0; i--) {
users.get(i).repaint();
}
}
/**
* Constructs and initializes a PhysicalEnvironment object with
* the specified number of sensors.
* @param sensorCount the number of sensors to create.
*/
public PhysicalEnvironment(int sensorCount) {
this.sensorCount = sensorCount;
sensors = new Sensor[sensorCount];
for(int i=sensorCount-1; i>=0; i--) {
sensors[i] = null;
}
}
/**
* Returns copy of Sensor references. Returns null for zero
* sensors, so user of method must check for null. Also, any of
* these sensors could be null.
*/
Sensor[] getSensorList() {
synchronized(sensors) {
if(sensorListChanged) { // note: this is a rare case
sensorList = new Sensor[sensors.length];
for(int i=0 ; i getAllInputDevices() {
return devices.elements();
}
/**
* Add an input device to the list of input devices. User is
* responsible for initializing the device and setting the
* processing mode (streaming or polling).
* @param device the device to be added to the list of input devices
* @exception IllegalArgumentException if InputDevice.getProcessingMode()
* does not return one of BLOCKING, NON_BLOCKING, or DEMAND_DRIVEN.
*/
public void addInputDevice(InputDevice device) {
int driver_type = device.getProcessingMode();
if ((driver_type == InputDevice.BLOCKING) ||
(driver_type == InputDevice.NON_BLOCKING) ||
(driver_type == InputDevice.DEMAND_DRIVEN)) {
synchronized (devices) {
devices.add(device);
if (inputsched != null) {
inputsched.addInputDevice(device);
}
}
} else {
throw new IllegalArgumentException(J3dI18N.getString("PhysicalEnvironment0"));
}
}
/**
* Remove an input device from the list of input devices.
* User is responsible for closing out the device and releasing
* the device resources.
* @param device the device to be removed
*/
public void removeInputDevice(InputDevice device) {
synchronized (devices) {
devices.remove(device);
if (inputsched != null) {
inputsched.removeInputDevice(device);
}
}
}
/**
* Sets the index of the head to the specified sensor index.
* @param index the new sensor index of the head
*/
public void setHeadIndex(int index) {
HeadIndex = index;
synchronized(this) {
computeTrackingAvailable();
peDirtyMask |= View.PE_TRACKING_AVAILABLE_DIRTY;
}
notifyUsers();
}
/**
* Gets the sensor index of the head.
* @return the sensor index of the head
*/
public int getHeadIndex() {
return HeadIndex;
}
/**
* Sets the index of the right hand to the specified sensor index.
* @param index the new sensor index of the right hand
*/
public void setRightHandIndex(int index) {
RightHandIndex = index;
notifyUsers();
}
/**
* Gets the sensor index of the right hand.
* @return the sensor index of the right hand
*/
public int getRightHandIndex() {
return RightHandIndex;
}
/**
* Sets the index of the left hand to the specified sensor index.
* @param index the new sensor index of the left hand
*/
public void setLeftHandIndex(int index) {
LeftHandIndex = index;
notifyUsers();
}
/**
* Gets the sensor index of the left hand.
* @return the sensor index of the left hand
*/
public int getLeftHandIndex() {
return LeftHandIndex;
}
/**
* Sets the index of the dominant hand to the specified sensor index.
* @param index the new sensor index of the dominant hand
*/
public void setDominantHandIndex(int index) {
DominantHandIndex = index;
notifyUsers();
}
/**
* Gets the sensor index of the dominant hand.
* @return the sensor index of the dominant hand
*/
public int getDominantHandIndex() {
return DominantHandIndex;
}
/**
* Sets the index of the non-dominant hand to the specified sensor index.
* @param index the new sensor index of the non dominant hand
*/
public void setNonDominantHandIndex(int index) {
NonDominantHandIndex = index;
notifyUsers();
}
/**
* Gets the sensor index of the non-dominant hand.
* @return the sensor index of the non dominant hand
*/
public int getNonDominantHandIndex() {
return NonDominantHandIndex;
}
/**
* Set the sensor specified by the index to sensor provided; sensors are
* indexed starting at 0. All sensors must be registered via this
* method.
* @param index the sensor's index
* @param sensor the new sensor
*/
public void setSensor(int index, Sensor sensor) {
synchronized(sensors) {
sensors[index] = sensor;
sensorListChanged = true;
}
synchronized(this) {
computeTrackingAvailable();
peDirtyMask |= View.PE_TRACKING_AVAILABLE_DIRTY;
}
notifyUsers();
}
/**
* Gets the sensor specified by the index; sensors are indexed starting
* at 0.
* @param index the sensor's index
*/
public Sensor getSensor(int index){
// not synchronized, since the only way to write to sensors is
// via a public API call, and user shouldn't call Sensor with
// two threads
return sensors[index];
}
/**
* Sets the coexistence coordinate system to tracker-base coordinate
* system transform. If head tracking is enabled, this transform
* is a calibration constant. If head tracking is not enabled,
* this transform is not used.
* This is used in both SCREEN_VIEW and HMD_VIEW modes.
* @param t the new transform
* @exception BadTransformException if the transform is not rigid
*/
public void setCoexistenceToTrackerBase(Transform3D t) {
if (!t.isRigid()) {
throw new BadTransformException(J3dI18N.getString("PhysicalEnvironment1"));
}
synchronized(this) {
coexistenceToTrackerBase.setWithLock(t);
peDirtyMask |= View.PE_COE_TO_TRACKER_BASE_DIRTY;
}
notifyUsers();
}
/**
* Retrieves the coexistence coordinate system to tracker-base
* coordinate system transform and copies it into the specified
* Transform3D object.
* @param t the object that will receive the transform
*/
public void getCoexistenceToTrackerBase(Transform3D t) {
t.set(coexistenceToTrackerBase);
}
/**
* Returns a status flag indicating whether or not tracking
* is available.
* @return a flag telling whether tracking is available
*/
public boolean getTrackingAvailable() {
return this.trackingAvailable;
}
/**
* Sets the coexistence center in physical world policy.
* This setting determines how Java 3D places the
* user's eye point as a function of head position during the
* calibration process, one of View.NOMINAL_SCREEN,
* View.NOMINAL_HEAD, or View.NOMINAL_FEET.
* The default policy is View.NOMINAL_SCREEN.
* @param policy the new policy
*/
public void setCoexistenceCenterInPworldPolicy(int policy) {
switch (policy) {
case View.NOMINAL_SCREEN:
case View.NOMINAL_HEAD:
case View.NOMINAL_FEET:
break;
default:
throw new IllegalArgumentException(J3dI18N.getString("PhysicalEnvironment2"));
}
synchronized(this) {
this.coexistenceCenterInPworldPolicy = policy;
peDirtyMask |= View.PE_COE_CENTER_IN_PWORLD_POLICY_DIRTY;
}
notifyUsers();
}
/**
* Returns the current coexistence center in physical world policy.
* @return one of: View.NOMINAL_SCREEN, View.NOMINAL_HEAD, or
* View.NOMINAL_FEET
*/
public int getCoexistenceCenterInPworldPolicy() {
return this.coexistenceCenterInPworldPolicy;
}
/**
* Get the current sensor count.
* @return the number of sensor objects per PhysicalEnvironment object
*/
public int getSensorCount() {
return sensorCount;
}
/**
* Set the number of sensor objects per PhysicalEnvironmnet. This is a
* calibration parameter that should be set before setting any sensors
* in the PhysicalEnvironment object. This call associates 'count'
* Sensors with this object, and they are indexed from 0 to count-1.
* @param count the new sensor count
*/
public void setSensorCount(int count) {
Sensor[] tmp = new Sensor[count];
int i=0;
synchronized(sensors) {
int min = Math.min(count, sensorCount);
while(i < min) {
tmp[i] = sensors[i++];
}
while(i < count) {
tmp[i++] = null;
}
sensorCount = count;
sensorListChanged = true;
sensors = tmp;
}
notifyUsers();
}
// (re-)compute the tracking available flag
private void computeTrackingAvailable() {
synchronized(sensors) {
trackingAvailable = ((HeadIndex < sensors.length) &&
(sensors[HeadIndex] != null));
}
}
}
