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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 javax.vecmath.Point3d;
/**
* The ViewCache class is used to cache all data, both API data and derived
* data, that is independent of the Canvas3D and Screen3D.
*/
class ViewCache extends Object {
// The view associated with this view cache
View view;
//
// API/INPUT DATA
//
// *********************
// * From ViewPlatform *
// *********************
int viewAttachPolicy;
// *********************
// * From PhysicalBody *
// *********************
/**
* The user's left eye's position in head coordinates.
*/
Point3d leftEyePosInHead = new Point3d();
/**
* The user's right eye's position in head coordinates.
*/
Point3d rightEyePosInHead = new Point3d();
/**
* The user's left ear's position in head coordinates.
*/
Point3d leftEarPosInHead = new Point3d();
/**
* The user's right ear's position in head coordinates.
*/
Point3d rightEarPosInHead = new Point3d();
/**
* The user's nominal eye height as measured
* from the ground plane.
*/
double nominalEyeHeightFromGround;
/**
* The amount to offset the system's
* viewpoint from the user's current eye-point. This offset
* distance allows an "Over the shoulder" view of the scene
* as seen by the user.
*/
double nominalEyeOffsetFromNominalScreen;
// Head to head-tracker 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 only used in SCREEN_VIEW mode.
Transform3D headToHeadTracker = new Transform3D();
// ****************************
// * From PhysicalEnvironment *
// ****************************
// 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();
// Transform generated by the head tracker to transform
// from tracker base to head tracker coordinates (and the inverse).
Transform3D headTrackerToTrackerBase = new Transform3D();
Transform3D trackerBaseToHeadTracker = new Transform3D();
//
// Indicates whether the underlying hardware implementation
// supports tracking.
//
boolean trackingAvailable;
// Sensor index for head tracker
int headIndex;
//
// 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.
//
int coexistenceCenterInPworldPolicy;
// *************
// * From View *
// *************
// View model compatibility mode flag
boolean compatibilityModeEnable;
// coexistenceCenteringEnable flag
boolean coexistenceCenteringEnable;
Point3d leftManualEyeInCoexistence = new Point3d();
Point3d rightManualEyeInCoexistence = new Point3d();
// Indicates which major mode of view computation to use:
// HMD mode or screen/fish-tank-VR mode.
int viewPolicy;
// The current projection policy (parallel versus perspective)
int projectionPolicy;
// The current screen scale policy and scale value
int screenScalePolicy;
double screenScale;
// The current window resize, movement and eyepoint policies
int windowResizePolicy;
int windowMovementPolicy;
int windowEyepointPolicy;
// The current monoscopic view policy
int monoscopicViewPolicy;
// The view model's field of view.
double fieldOfView;
// The distance away from the clip origin
// in the direction of gaze for the front and back clip planes.
double frontClipDistance;
double backClipDistance;
// Front and back clip policies
int frontClipPolicy;
int backClipPolicy;
// ViewPlatform of this view
ViewPlatformRetained vpRetained;
/**
* Defines the visibility policy.
*/
int visibilityPolicy;
// Flag to enable tracking, if so allowed by the trackingAvailable flag.
boolean trackingEnable;
// This setting enables the continuous updating by Java 3D of the
// userHeadToVworld transform.
boolean userHeadToVworldEnable;
// The current compatibility mode view transform
Transform3D compatVpcToEc = new Transform3D();
// The current compatibility mode projection transforms
Transform3D compatLeftProjection = new Transform3D();
Transform3D compatRightProjection = new Transform3D();
// Mask that indicates ViewCache's view dependence info. has changed,
// and CanvasViewCache may need to recompute the final view matries.
int vcDirtyMask = 0;
//
// DERIVED DATA
//
// Flag indicating that head tracking will be used
private boolean doHeadTracking;
//
// Matrix to transform from user-head to
// virtual-world coordinates. This matrix is a read-only
// value that Java 3D generates continuously, but only if enabled
// by userHeadToVworldEnableFlag.
//
Transform3D userHeadToVworld = new Transform3D();
/**
* Take snapshot of all per-view API parameters and input values.
*/
synchronized void snapshot() {
// View parameters
vcDirtyMask = view.vDirtyMask;
view.vDirtyMask = 0;
compatibilityModeEnable = view.compatibilityModeEnable;
coexistenceCenteringEnable = view.coexistenceCenteringEnable;
leftManualEyeInCoexistence.set(view.leftManualEyeInCoexistence);
rightManualEyeInCoexistence.set(view.rightManualEyeInCoexistence);
viewPolicy = view.viewPolicy;
projectionPolicy = view.projectionPolicy;
screenScalePolicy = view.screenScalePolicy;
windowResizePolicy = view.windowResizePolicy;
windowMovementPolicy = view.windowMovementPolicy;
windowEyepointPolicy = view.windowEyepointPolicy;
monoscopicViewPolicy = view.monoscopicViewPolicy;
fieldOfView = view.fieldOfView;
screenScale = view.screenScale;
frontClipDistance = view.frontClipDistance;
backClipDistance = view.backClipDistance;
frontClipPolicy = view.frontClipPolicy;
backClipPolicy = view.backClipPolicy;
visibilityPolicy = view.visibilityPolicy;
trackingEnable = view.trackingEnable;
userHeadToVworldEnable = view.userHeadToVworldEnable;
view.compatVpcToEc.getWithLock(compatVpcToEc);
view.compatLeftProjection.getWithLock(compatLeftProjection);
view.compatRightProjection.getWithLock(compatRightProjection);
// ViewPlatform parameters
ViewPlatform vpp = view.getViewPlatform();
if (vpp == null) {
// This happens when user attach a null viewplatform
// and MC still call updateViewCache() in run before
// the viewDeactivate request get.
return;
}
vpRetained = (ViewPlatformRetained) vpp.retained;
synchronized(vpRetained) {
vcDirtyMask |= vpRetained.vprDirtyMask;
vpRetained.vprDirtyMask = 0;
viewAttachPolicy = vpRetained.viewAttachPolicy;
// System.err.println("ViewCache snapshot vcDirtyMask " + vcDirtyMask );
}
// PhysicalEnvironment parameters
PhysicalEnvironment env = view.getPhysicalEnvironment();
synchronized(env) {
vcDirtyMask |= env.peDirtyMask;
env.peDirtyMask = 0;
env.coexistenceToTrackerBase.getWithLock(coexistenceToTrackerBase);
trackingAvailable = env.trackingAvailable;
coexistenceCenterInPworldPolicy = env.coexistenceCenterInPworldPolicy;
// NOTE: this is really derived data, but we need it here in order
// to avoid reading head tracked data when no tracker is available
// and enabled.
doHeadTracking = trackingEnable && trackingAvailable;
if (doHeadTracking) {
headIndex = env.getHeadIndex();
env.getSensor(headIndex).getRead(headTrackerToTrackerBase);
vcDirtyMask |= View.TRACKING_ENABLE_DIRTY;
}
else {
headTrackerToTrackerBase.setIdentity();
}
}
// PhysicalBody parameters
PhysicalBody body = view.getPhysicalBody();
synchronized(body) {
vcDirtyMask |= body.pbDirtyMask;
body.pbDirtyMask = 0;
leftEyePosInHead.set(body.leftEyePosition);
rightEyePosInHead.set(body.rightEyePosition);
leftEarPosInHead.set(body.leftEarPosition);
rightEarPosInHead.set(body.rightEarPosition);
nominalEyeHeightFromGround = body.nominalEyeHeightFromGround;
nominalEyeOffsetFromNominalScreen =
body.nominalEyeOffsetFromNominalScreen;
}
body.headToHeadTracker.getWithLock(headToHeadTracker);
}
/**
* Compute derived data using the snapshot of the per-view data.
*/
synchronized void computeDerivedData() {
if (doHeadTracking) {
trackerBaseToHeadTracker.invert(headTrackerToTrackerBase);
//System.err.println("trackerBaseToHeadTracker: ");
//System.err.println(trackerBaseToHeadTracker);
}
else {
trackerBaseToHeadTracker.setIdentity();
}
// XXXX: implement head to vworld tracking if userHeadToVworldEnable is set
userHeadToVworld.setIdentity();
}
// Get methods for returning derived data values.
// Eventually, these get functions will cause some of the parameters
// to be lazily evaluated.
//
// NOTE that in the case of Transform3D, and Tuple objects, a reference
// to the actual derived data is returned. In these cases, the caller
// must ensure that the returned data is not modified.
boolean getDoHeadTracking() {
return doHeadTracking;
}
/**
* Constructs and initializes a ViewCache object.
*/
ViewCache(View view) {
this.view = view;
if (false)
System.err.println("Constructed a ViewCache");
}
}
