Source Code Cross Referenced for ViewCache.java in  » 6.0-JDK-Modules » java-3d » javax » media » j3d » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » javax.media.j3d 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: ViewCache.java,v $
003:         *
004:         * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
006:         *
007:         * This code is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU General Public License version 2 only, as
009:         * published by the Free Software Foundation.  Sun designates this
010:         * particular file as subject to the "Classpath" exception as provided
011:         * by Sun in the LICENSE file that accompanied this code.
012:         *
013:         * This code is distributed in the hope that it will be useful, but WITHOUT
014:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:         * version 2 for more details (a copy is included in the LICENSE file that
017:         * accompanied this code).
018:         *
019:         * You should have received a copy of the GNU General Public License version
020:         * 2 along with this work; if not, write to the Free Software Foundation,
021:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
022:         *
023:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
024:         * CA 95054 USA or visit www.sun.com if you need additional information or
025:         * have any questions.
026:         *
027:         * $Revision: 1.7 $
028:         * $Date: 2008/02/28 20:17:32 $
029:         * $State: Exp $
030:         */
031:
032:        package javax.media.j3d;
033:
034:        import javax.vecmath.*;
035:
036:        /**
037:         * The ViewCache class is used to cache all data, both API data and derived
038:         * data, that is independent of the Canvas3D and Screen3D.
039:         */
040:        class ViewCache extends Object {
041:            // The view associated with this view cache
042:            View view;
043:
044:            //
045:            // API/INPUT DATA
046:            //
047:
048:            // *********************
049:            // * From ViewPlatform *
050:            // *********************
051:            int viewAttachPolicy;
052:
053:            // *********************
054:            // * From PhysicalBody *
055:            // *********************
056:
057:            /**
058:             * The user's left eye's position in head coordinates.
059:             */
060:            Point3d leftEyePosInHead = new Point3d();
061:
062:            /**
063:             * The user's right eye's position in head coordinates.
064:             */
065:            Point3d rightEyePosInHead = new Point3d();
066:
067:            /**
068:             * The user's left ear's position in head coordinates.
069:             */
070:            Point3d leftEarPosInHead = new Point3d();
071:
072:            /**
073:             * The user's right ear's position in head coordinates.
074:             */
075:            Point3d rightEarPosInHead = new Point3d();
076:
077:            /**
078:             * The user's nominal eye height as measured
079:             * from the ground plane.
080:             */
081:            double nominalEyeHeightFromGround;
082:
083:            /**
084:             * The amount to offset the system's
085:             * viewpoint from the user's current eye-point.  This offset
086:             * distance allows an "Over the shoulder" view of the scene
087:             * as seen by the user.
088:             */
089:            double nominalEyeOffsetFromNominalScreen;
090:
091:            // Head to head-tracker coordinate system transform.
092:            // If head tracking is enabled, this transform is a calibration
093:            // constant.  If head tracking is not enabled, this transform is
094:            // not used.
095:            // This is only used in SCREEN_VIEW mode.
096:            Transform3D headToHeadTracker = new Transform3D();
097:
098:            // ****************************
099:            // * From PhysicalEnvironment *
100:            // ****************************
101:
102:            // Coexistence coordinate system to tracker-base coordinate
103:            // system transform.  If head tracking is enabled, this transform
104:            // is a calibration constant.  If head tracking is not enabled,
105:            // this transform is not used.
106:            // This is used in both SCREEN_VIEW and HMD_VIEW modes.
107:            Transform3D coexistenceToTrackerBase = new Transform3D();
108:
109:            // Transform generated by the head tracker to transform
110:            // from tracker base to head tracker coordinates (and the inverse).
111:            Transform3D headTrackerToTrackerBase = new Transform3D();
112:            Transform3D trackerBaseToHeadTracker = new Transform3D();
113:
114:            //
115:            // Indicates whether the underlying hardware implementation
116:            // supports tracking.
117:            //
118:            boolean trackingAvailable;
119:
120:            // Sensor index for head tracker
121:            int headIndex;
122:
123:            //
124:            // This variable specifies the policy Java 3D will use in placing
125:            // the user's eye position relative to the user's head position
126:            // (NOMINAL_SCREEN, NOMINAL_HEAD, or NOMINAL_FEET).
127:            // It is used in the calibration process.
128:            //
129:            int coexistenceCenterInPworldPolicy;
130:
131:            // *************
132:            // * From View *
133:            // *************
134:
135:            // View model compatibility mode flag
136:            boolean compatibilityModeEnable;
137:
138:            // coexistenceCenteringEnable flag
139:            boolean coexistenceCenteringEnable;
140:
141:            Point3d leftManualEyeInCoexistence = new Point3d();
142:            Point3d rightManualEyeInCoexistence = new Point3d();
143:
144:            // Indicates which major mode of view computation to use:
145:            // HMD mode or screen/fish-tank-VR mode.
146:            int viewPolicy;
147:
148:            // The current projection policy (parallel versus perspective)
149:            int projectionPolicy;
150:
151:            // The current screen scale policy and scale value
152:            int screenScalePolicy;
153:            double screenScale;
154:
155:            // The current window resize, movement and eyepoint policies
156:            int windowResizePolicy;
157:            int windowMovementPolicy;
158:            int windowEyepointPolicy;
159:
160:            // The current monoscopic view policy
161:            int monoscopicViewPolicy;
162:
163:            // The view model's field of view.
164:            double fieldOfView;
165:
166:            // The distance away from the clip origin
167:            // in the direction of gaze for the front and back clip planes.
168:            double frontClipDistance;
169:            double backClipDistance;
170:
171:            // Front and back clip policies
172:            int frontClipPolicy;
173:            int backClipPolicy;
174:
175:            // ViewPlatform of this view
176:            ViewPlatformRetained vpRetained;
177:
178:            /**
179:             * Defines the visibility policy.
180:             */
181:            int visibilityPolicy;
182:
183:            // Flag to enable tracking, if so allowed by the trackingAvailable flag.
184:            boolean trackingEnable;
185:
186:            // This setting enables the continuous updating by Java 3D of the
187:            // userHeadToVworld transform.
188:            boolean userHeadToVworldEnable;
189:
190:            // The current compatibility mode view transform
191:            Transform3D compatVpcToEc = new Transform3D();
192:
193:            // The current compatibility mode projection transforms
194:            Transform3D compatLeftProjection = new Transform3D();
195:            Transform3D compatRightProjection = new Transform3D();
196:
197:            // Mask that indicates ViewCache's view dependence info. has changed,
198:            // and CanvasViewCache may need to recompute the final view matries. 
199:            int vcDirtyMask = 0;
200:
201:            //
202:            // DERIVED DATA
203:            //
204:
205:            // Flag indicating that head tracking will be used
206:            private boolean doHeadTracking;
207:
208:            //
209:            // Matrix to transform from user-head to
210:            // virtual-world coordinates. This matrix is a read-only
211:            // value that Java 3D generates continuously, but only if enabled
212:            // by userHeadToVworldEnableFlag.
213:            //
214:            Transform3D userHeadToVworld = new Transform3D();
215:
216:            /**
217:             * Take snapshot of all per-view API parameters and input values.
218:             */
219:            synchronized void snapshot() {
220:
221:                // View parameters
222:                vcDirtyMask = view.vDirtyMask;
223:                view.vDirtyMask = 0;
224:                compatibilityModeEnable = view.compatibilityModeEnable;
225:                coexistenceCenteringEnable = view.coexistenceCenteringEnable;
226:                leftManualEyeInCoexistence.set(view.leftManualEyeInCoexistence);
227:                rightManualEyeInCoexistence
228:                        .set(view.rightManualEyeInCoexistence);
229:                viewPolicy = view.viewPolicy;
230:                projectionPolicy = view.projectionPolicy;
231:                screenScalePolicy = view.screenScalePolicy;
232:                windowResizePolicy = view.windowResizePolicy;
233:                windowMovementPolicy = view.windowMovementPolicy;
234:                windowEyepointPolicy = view.windowEyepointPolicy;
235:                monoscopicViewPolicy = view.monoscopicViewPolicy;
236:
237:                fieldOfView = view.fieldOfView;
238:                screenScale = view.screenScale;
239:
240:                frontClipDistance = view.frontClipDistance;
241:                backClipDistance = view.backClipDistance;
242:                frontClipPolicy = view.frontClipPolicy;
243:                backClipPolicy = view.backClipPolicy;
244:
245:                visibilityPolicy = view.visibilityPolicy;
246:
247:                trackingEnable = view.trackingEnable;
248:                userHeadToVworldEnable = view.userHeadToVworldEnable;
249:
250:                view.compatVpcToEc.getWithLock(compatVpcToEc);
251:                view.compatLeftProjection.getWithLock(compatLeftProjection);
252:                view.compatRightProjection.getWithLock(compatRightProjection);
253:
254:                // ViewPlatform parameters
255:                ViewPlatform vpp = view.getViewPlatform();
256:
257:                if (vpp == null) {
258:                    // This happens when user attach a null viewplatform
259:                    // and MC still call updateViewCache() in run before
260:                    // the viewDeactivate request get.
261:                    return;
262:                }
263:
264:                vpRetained = (ViewPlatformRetained) vpp.retained;
265:
266:                synchronized (vpRetained) {
267:                    vcDirtyMask |= vpRetained.vprDirtyMask;
268:                    vpRetained.vprDirtyMask = 0;
269:                    viewAttachPolicy = vpRetained.viewAttachPolicy;
270:                    // System.err.println("ViewCache snapshot vcDirtyMask " + vcDirtyMask );
271:                }
272:
273:                // PhysicalEnvironment parameters
274:                PhysicalEnvironment env = view.getPhysicalEnvironment();
275:
276:                synchronized (env) {
277:                    vcDirtyMask |= env.peDirtyMask;
278:                    env.peDirtyMask = 0;
279:
280:                    env.coexistenceToTrackerBase
281:                            .getWithLock(coexistenceToTrackerBase);
282:                    trackingAvailable = env.trackingAvailable;
283:                    coexistenceCenterInPworldPolicy = env.coexistenceCenterInPworldPolicy;
284:
285:                    // NOTE: this is really derived data, but we need it here in order
286:                    // to avoid reading head tracked data when no tracker is available
287:                    // and enabled.
288:                    doHeadTracking = trackingEnable && trackingAvailable;
289:
290:                    if (doHeadTracking) {
291:                        headIndex = env.getHeadIndex();
292:                        env.getSensor(headIndex).getRead(
293:                                headTrackerToTrackerBase);
294:                        vcDirtyMask |= View.TRACKING_ENABLE_DIRTY;
295:                    } else {
296:                        headTrackerToTrackerBase.setIdentity();
297:                    }
298:                }
299:
300:                // PhysicalBody parameters
301:                PhysicalBody body = view.getPhysicalBody();
302:
303:                synchronized (body) {
304:                    vcDirtyMask |= body.pbDirtyMask;
305:                    body.pbDirtyMask = 0;
306:
307:                    leftEyePosInHead.set(body.leftEyePosition);
308:                    rightEyePosInHead.set(body.rightEyePosition);
309:                    leftEarPosInHead.set(body.leftEarPosition);
310:                    rightEarPosInHead.set(body.rightEarPosition);
311:
312:                    nominalEyeHeightFromGround = body.nominalEyeHeightFromGround;
313:                    nominalEyeOffsetFromNominalScreen = body.nominalEyeOffsetFromNominalScreen;
314:                }
315:
316:                body.headToHeadTracker.getWithLock(headToHeadTracker);
317:            }
318:
319:            /**
320:             * Compute derived data using the snapshot of the per-view data.
321:             */
322:            synchronized void computeDerivedData() {
323:                if (doHeadTracking) {
324:                    trackerBaseToHeadTracker.invert(headTrackerToTrackerBase);
325:                    //System.err.println("trackerBaseToHeadTracker: ");
326:                    //System.err.println(trackerBaseToHeadTracker);
327:                } else {
328:                    trackerBaseToHeadTracker.setIdentity();
329:                }
330:
331:                // XXXX: implement head to vworld tracking if userHeadToVworldEnable is set
332:                userHeadToVworld.setIdentity();
333:            }
334:
335:            // Get methods for returning derived data values.
336:            // Eventually, these get functions will cause some of the parameters
337:            // to be lazily evaluated.
338:            //
339:            // NOTE that in the case of Transform3D, and Tuple objects, a reference
340:            // to the actual derived data is returned.  In these cases, the caller
341:            // must ensure that the returned data is not modified.
342:
343:            boolean getDoHeadTracking() {
344:                return doHeadTracking;
345:            }
346:
347:            /**
348:             * Constructs and initializes a ViewCache object.
349:             */
350:            ViewCache(View view) {
351:                this .view = view;
352:
353:                if (false)
354:                    System.err.println("Constructed a ViewCache");
355:            }
356:
357:        }
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