Gets Harvey's changes

1 files changed, 134 insertions, 0 deletions

diff --git a/src/javax/media/j3d/ScreenViewCache.java b/src/javax/media/j3d/ScreenViewCache.java
new file mode 100644
index 0000000..bc4cdd1
--- /dev/null
+++ b/src/javax/media/j3d/ScreenViewCache.java
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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;
+
+
+/**
+ * The ScreenViewCache class is used to cache all API data
+ * from the Screen3D object.
+ */
+class ScreenViewCache extends Object {
+    // The screen associated with this screen view cache
+    Screen3D screen;
+
+    //
+    // API/INPUT DATA
+    //
+
+    // The width and height of the screen in meters.
+    double physicalScreenWidth;
+    double physicalScreenHeight;
+
+    // The width and height of the screen in pixels.
+    int screenWidth;
+    int screenHeight;
+
+    // Mask that indicates Screen3D view dependence info. has changed,
+    // and CanvasViewCache may need to recompute the final view matries.
+    // Issue 163: Array of dirty bits is used because the Renderer and
+    // RenderBin run asynchronously. Now that they each have a separate
+    // instance of CanvasViewCache (due to the fix for Issue 109), they
+    // need separate dirty bits. Array element 0 is used for the Renderer and
+    // element 1 is used for the RenderBin.
+    int[] scrvcDirtyMask = new int[2];
+
+    //
+    // Tracker-base coordinate system to image-plate 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 only in SCREEN_VIEW mode.
+    //
+    Transform3D trackerBaseToImagePlate = new Transform3D();
+
+    //
+    // Head-tracker coordinate system to left and right image-plate coordinate
+    // system transforms.  If head tracking is enabled, these transforms
+    // are calibration constants.  If head tracking is not enabled,
+    // these transforms are not used.
+    // These are used only in HMD_VIEW mode.
+    //
+    Transform3D headTrackerToLeftImagePlate = new Transform3D();
+    Transform3D headTrackerToRightImagePlate = new Transform3D();
+
+
+    //
+    // DERIVED DATA
+    //
+
+    // Meters per pixel in the X and Y dimension
+    double metersPerPixelX;
+    double metersPerPixelY;
+
+
+    /**
+     * Take snapshot of all per-screen API parameters.
+     */
+    synchronized void snapshot() {
+
+        // accumulate the dirty bits for offscreen because
+        // the dirty bits will not be processed until renderOffScreen
+        // or triggered by RenderBin at some little time
+        if (screen.offScreen) {
+            scrvcDirtyMask[0] |= screen.scrDirtyMask;
+            scrvcDirtyMask[1] |= screen.scrDirtyMask;
+        } else {
+            scrvcDirtyMask[0] = screen.scrDirtyMask;
+            scrvcDirtyMask[1] = screen.scrDirtyMask;
+        }
+        screen.scrDirtyMask = 0;
+
+        physicalScreenWidth = screen.physicalScreenWidth;
+	physicalScreenHeight = screen.physicalScreenHeight;
+	screenWidth = screen.screenSize.width;
+	screenHeight = screen.screenSize.height;
+
+	screen.trackerBaseToImagePlate.getWithLock(trackerBaseToImagePlate);
+
+	screen.headTrackerToLeftImagePlate.getWithLock
+	    (headTrackerToLeftImagePlate);
+	screen.headTrackerToRightImagePlate.getWithLock
+	    (headTrackerToRightImagePlate);
+
+	// This isn't really API data, but since we have no other derived
+	// data, and it's a simple calculation, it's easier if we just do
+	// it here.
+	metersPerPixelX = physicalScreenWidth / (double) screenWidth;
+	metersPerPixelY = physicalScreenHeight / (double) screenHeight;
+    }
+
+
+    /**
+     * Constructs and initializes a ScreenViewCache object.
+     */
+    ScreenViewCache(Screen3D screen) {
+	this.screen = screen;
+
+	if (false)
+	    System.err.println("Constructed a ScreenViewCache");
+    }
+}