001: /*
002: * $RCSfile: ScreenViewCache.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 20:17:29 $
029: * $State: Exp $
030: */
031:
032: package javax.media.j3d;
033:
034: import java.awt.Dimension;
035: import javax.vecmath.*;
036:
037: /**
038: * The ScreenViewCache class is used to cache all API data
039: * from the Screen3D object.
040: */
041: class ScreenViewCache extends Object {
042: // The screen associated with this screen view cache
043: Screen3D screen;
044:
045: //
046: // API/INPUT DATA
047: //
048:
049: // The width and height of the screen in meters.
050: double physicalScreenWidth;
051: double physicalScreenHeight;
052:
053: // The width and height of the screen in pixels.
054: int screenWidth;
055: int screenHeight;
056:
057: // Mask that indicates Screen3D view dependence info. has changed,
058: // and CanvasViewCache may need to recompute the final view matries.
059: // Issue 163: Array of dirty bits is used because the Renderer and
060: // RenderBin run asynchronously. Now that they each have a separate
061: // instance of CanvasViewCache (due to the fix for Issue 109), they
062: // need separate dirty bits. Array element 0 is used for the Renderer and
063: // element 1 is used for the RenderBin.
064: int[] scrvcDirtyMask = new int[2];
065:
066: //
067: // Tracker-base coordinate system to image-plate coordinate
068: // system transform. If head tracking is enabled, this transform
069: // is a calibration constant. If head tracking is not enabled,
070: // this transform is not used.
071: // This is used only in SCREEN_VIEW mode.
072: //
073: Transform3D trackerBaseToImagePlate = new Transform3D();
074:
075: //
076: // Head-tracker coordinate system to left and right image-plate coordinate
077: // system transforms. If head tracking is enabled, these transforms
078: // are calibration constants. If head tracking is not enabled,
079: // these transforms are not used.
080: // These are used only in HMD_VIEW mode.
081: //
082: Transform3D headTrackerToLeftImagePlate = new Transform3D();
083: Transform3D headTrackerToRightImagePlate = new Transform3D();
084:
085: //
086: // DERIVED DATA
087: //
088:
089: // Meters per pixel in the X and Y dimension
090: double metersPerPixelX;
091: double metersPerPixelY;
092:
093: /**
094: * Take snapshot of all per-screen API parameters.
095: */
096: synchronized void snapshot() {
097:
098: // accumulate the dirty bits for offscreen because
099: // the dirty bits will not be processed until renderOffScreen
100: // or triggered by RenderBin at some little time
101: if (screen.offScreen) {
102: scrvcDirtyMask[0] |= screen.scrDirtyMask;
103: scrvcDirtyMask[1] |= screen.scrDirtyMask;
104: } else {
105: scrvcDirtyMask[0] = screen.scrDirtyMask;
106: scrvcDirtyMask[1] = screen.scrDirtyMask;
107: }
108: screen.scrDirtyMask = 0;
109:
110: physicalScreenWidth = screen.physicalScreenWidth;
111: physicalScreenHeight = screen.physicalScreenHeight;
112: screenWidth = screen.screenSize.width;
113: screenHeight = screen.screenSize.height;
114:
115: screen.trackerBaseToImagePlate
116: .getWithLock(trackerBaseToImagePlate);
117:
118: screen.headTrackerToLeftImagePlate
119: .getWithLock(headTrackerToLeftImagePlate);
120: screen.headTrackerToRightImagePlate
121: .getWithLock(headTrackerToRightImagePlate);
122:
123: // This isn't really API data, but since we have no other derived
124: // data, and it's a simple calculation, it's easier if we just do
125: // it here.
126: metersPerPixelX = physicalScreenWidth / (double) screenWidth;
127: metersPerPixelY = physicalScreenHeight / (double) screenHeight;
128: }
129:
130: /**
131: * Constructs and initializes a ScreenViewCache object.
132: */
133: ScreenViewCache(Screen3D screen) {
134: this .screen = screen;
135:
136: if (false)
137: System.err.println("Constructed a ScreenViewCache");
138: }
139: }
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