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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 javax.vecmath.Point3d;
/**
* ViewPlatform object (retained side)
*/
class ViewPlatformRetained extends LeafRetained {
// different types of IndexedUnorderedSet that use in BehaviorStructure
static final int VP_IN_BS_LIST = 0;
// total number of different IndexedUnorderedSet types
static final int TOTAL_INDEXED_UNORDER_SET_TYPES = 1;
/**
* This variable specifies the policy Java 3D will use in placing the
* user's eye point as a function of head position. The variable can
* contain one of NOMINAL_SCREEN, NOMINAL_HEAD, or NOMINAL_FEET.
*/
int viewAttachPolicy = View.NOMINAL_HEAD;
/**
* The list of views associated with this view platform.
* Use getViewList() to access this variable.
*/
private ArrayList viewList = new ArrayList();
/**
* Cached list of viewList for synchronization
*/
private View views[] = null;
// The locale that this node is decended from
Locale locale = null;
// dirty flag for viewList
boolean viewListDirty = true;
/**
* The current cached view platform transform (vworldToVpc) and
* its inverse (vpcToVworld).
*/
Transform3D vworldToVpc = null;
Transform3D vpcToVworld = new Transform3D();
/**
* The activation radius. The value is chosen so that when using a
* default screen scale and field of view, the entire view frustum
* is enclosed.
*/
/**
* Position used for placing this view platform.
*/
BoundingSphere sphere =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 62.0f);
/**
* This is the cached bounding sphere used for the activation volume.
*/
BoundingSphere schedSphere;
Point3d center = new Point3d();
final static Point3d zeroPoint = new Point3d();
// Mask that indicates this ViewPlatformRetained's view dependence info. has changed,
// and CanvasViewCache may need to recompute the final view matries.
int vprDirtyMask = (View.VPR_VIEW_ATTACH_POLICY_DIRTY
| View.VPR_VIEWPLATFORM_DIRTY);
static final Object emptyObj[] = new Object[0];
static final Transform3D identity = new Transform3D();
ViewPlatformRetained() {
this.nodeType = NodeRetained.VIEWPLATFORM;
localBounds = new BoundingBox((Bounds)null);
IndexedUnorderSet.init(this, TOTAL_INDEXED_UNORDER_SET_TYPES);
schedSphere = (BoundingSphere) sphere.clone();
}
/**
* Sets the coexistence center in virtual world policy.
* This setting determines how Java 3D places the
* user's eye point as a function of head position. The variable can
* contain one of NOMINAL_SCREEN, NOMINAL_HEAD, or NOMINAL_FEET.
* @param policy the new policy, one of NOMINAL_SCREEN, NOMINAL_HEAD,
* or NOMINAL_FEET
*/
void setViewAttachPolicy(int policy) {
synchronized(this) {
this.viewAttachPolicy = policy;
vprDirtyMask |= View.VPR_VIEW_ATTACH_POLICY_DIRTY;
}
if (source != null && source.isLive()) {
repaint();
}
}
void repaint() {
View views[] = getViewList();
for (int i=views.length-1; i >=0; i--) {
views[i].repaint();
}
}
/**
* Returns the current coexistence center in virtual-world policy.
* @return one of: NOMINAL_SCREEN, NOMINAL_HEAD, or NOMINAL_FEET
*/
int getViewAttachPolicy() {
return this.viewAttachPolicy;
}
/**
* Set the ViewPlatform's activation radius
*/
void setActivationRadius(float activationRadius) {
sphere.setRadius(activationRadius);
if (source != null && source.isLive()) {
repaint();
}
// Notify behavior scheduler & RenderBin
if (source.isLive()) {
J3dMessage message = new J3dMessage();
message.type = J3dMessage.UPDATE_VIEWPLATFORM;
message.threads = J3dThread.UPDATE_RENDER|J3dThread.UPDATE_BEHAVIOR;
message.universe = universe;
message.args[0] = this;
message.args[1] = new Float(activationRadius);
VirtualUniverse.mc.processMessage(message);
} else {
schedSphere.setRadius(activationRadius);
}
}
/**
* Get the ViewPlatform's activation radius
*/
float getActivationRadius() {
return (float) sphere.getRadius();
}
/**
* This sets the view that is associated with this view platform.
*/
void setView(View v) {
synchronized (viewList) {
if (!viewList.contains(v)) {
viewList.add(v);
viewListDirty = true;
}
}
}
void removeView(View v) {
synchronized (viewList) {
if (viewList.remove(v))
viewListDirty = true;
}
}
Transform3D getVworldToVpc() {
if (vworldToVpc == null)
vworldToVpc = new Transform3D();
vworldToVpc.set(getCurrentLocalToVworld(null));
vworldToVpc.invert();
return vworldToVpc;
}
Transform3D getVpcToVworld() {
vpcToVworld .set(getCurrentLocalToVworld(null));
return vpcToVworld;
}
void evaluateViewPlatformTransform() {
// clear cache so that next time getVworldToVpc() can recompute
vworldToVpc = null;
}
/**
* Evaluate the view platform transform by traversing *up* the tree from
* this ViewPlatform node, computing the composite model transform
* along the way. Because we are traversing bottom to top, we must
* multiply each TransformGroup's matrix on the left by the
* composite transform on the right (rather than the other way
* around as is usually done). Once we have the composite model
* transform for this ViewPlatform--the vpcToVworld transform--we
* simply invert it to get the vworldToVpc transform.
*/
void evaluateInitViewPlatformTransform(NodeRetained node, Transform3D trans) {
if (node instanceof TransformGroupRetained) {
Transform3D tmpTrans = new Transform3D();
TransformGroupRetained tgr = (TransformGroupRetained)node;
tgr.transform.getWithLock(tmpTrans);
trans.mul(tmpTrans, trans);
}
NodeRetained parent = node.getParent();
if (parent != null) {
// Not at the top yet.
evaluateInitViewPlatformTransform(parent, trans);
}
}
void evaluateInitViewPlatformTransform() {
Transform3D lastLocalToVworld;
synchronized (this) {
lastLocalToVworld = getLastLocalToVworld();
if (lastLocalToVworld.equals(identity)) {
// lastLocalToVworld not yet updated
// for Renderer viewCache when startup
evaluateInitViewPlatformTransform((NodeRetained)this,
lastLocalToVworld);
}
}
}
// This is invoke from BehaviorStructure
void updateActivationRadius(float radius) {
schedSphere.setCenter(zeroPoint);
schedSphere.setRadius(radius);
schedSphere.transform(getCurrentLocalToVworld(null));
}
// This is invoke from BehaviorStructure when TransformGroup
// above this viewplatform changed
void updateTransformRegion() {
Transform3D tr = getCurrentLocalToVworld(null);
schedSphere.setCenter(zeroPoint);
schedSphere.transform(tr);
tr.transform(zeroPoint, center);
}
/**
* This setLive routine first calls the superclass's method, then
* it evaluates the view platform transform, and then it activates
* all canvases that are associated with the attached view.
*/
@Override
void setLive(SetLiveState s) {
View views[] = getViewList();
for (int i = views.length-1; i>=0; i--) {
views[i].checkView();
}
super.doSetLive(s);
if (inBackgroundGroup) {
throw new
IllegalSceneGraphException(J3dI18N.getString("ViewPlatformRetained1"));
}
if (inSharedGroup) {
throw new
IllegalSharingException(J3dI18N.getString("ViewPlatformRetained2"));
}
if (s.viewLists != null) {
throw new
IllegalSceneGraphException(J3dI18N.getString("ViewPlatformRetained3"));
}
/*
if (false) {
System.err.println("setLive: vworldToVpc = ");
System.err.println(this.vworldToVpc);
System.err.println("setLive: vpcToVworld = ");
System.err.println(this.vpcToVworld);
}
*/
this.locale = s.locale;
if (s.transformTargets != null && s.transformTargets[0] != null) {
s.transformTargets[0].addNode(this, Targets.VPF_TARGETS);
s.notifyThreads |= J3dThread.UPDATE_TRANSFORM;
}
// process switch leaf
if (s.switchTargets != null &&
s.switchTargets[0] != null) {
s.switchTargets[0].addNode(this, Targets.VPF_TARGETS);
}
switchState = s.switchStates.get(0);
s.nodeList.add(this);
s.notifyThreads |= (J3dThread.UPDATE_BEHAVIOR);
super.markAsLive();
for (int i = views.length-1; i>=0; i--) {
views[i].setUniverse(s.universe);
views[i].evaluateActive();
}
universe.addViewPlatform(this);
s.traverseFlags |= NodeRetained.CONTAINS_VIEWPLATFORM;
}
/**
* This clearLive routine first calls the superclass's method, then
* it deactivates all canvases that are associated with the attached
* view.
*/
@Override
void clearLive(SetLiveState s) {
super.clearLive(s);
if (s.switchTargets != null &&
s.switchTargets[0] != null) {
s.switchTargets[0].addNode(this, Targets.VPF_TARGETS);
}
View views[] = getViewList();
for (int i = views.length-1; i>=0; i--) {
views[i].evaluateActive();
}
s.nodeList.add(this);
if (s.transformTargets != null && s.transformTargets[0] != null) {
s.transformTargets[0].addNode(this, Targets.VPF_TARGETS);
s.notifyThreads |= J3dThread.UPDATE_TRANSFORM;
}
s.notifyThreads |= (J3dThread.UPDATE_BEHAVIOR |
J3dThread.SOUND_SCHEDULER);
universe.removeViewPlatform(this);
}
/**
* Re-evaluate all View active status reference to this view
* platform. This procedure is called from RenderBin when switch
* above a view platform changed.
*/
void reEvaluateView() {
View views[] = getViewList();
for (int i=views.length-1; i >=0; i--) {
views[i].evaluateActive();
}
}
/**
* Get a copy of cached view list
*/
View[] getViewList() {
synchronized (viewList) {
if (viewListDirty) {
views = viewList.toArray(new View[viewList.size()]);
viewListDirty = false;
}
return views;
}
}
/**
* Use by BehaviorStructure to determine whether current
* ViewPlatform is active or not.
*/
boolean isActiveViewPlatform() {
View v[] = getViewList();
for (int i = 0; i < v.length; i++) {
if (v[i].active) {
return true;
}
}
return false;
}
void processSwitchChanged() {
reEvaluateView();
}
@Override
void compile(CompileState compState) {
super.compile(compState);
// keep the parent transform group. It's not worth
// to push the static transform here.
compState.keepTG = true;
}
}
