This is the O3D source tree's initial commit to the Chromium tree. It

is not built or referenced at all by the chrome build yet, and doesn't 
yet build in it's new home.  We'll change that shortly.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17035 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 364 insertions, 0 deletions

diff --git a/o3d/samples/o3djs/camera.js b/o3d/samples/o3djs/camera.js
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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/**
+ * @fileoverview This file contains various camera utility functions for
+ * o3d.  It puts them in the "camera" module on the o3djs object.
+ *
+ *     Note: This library is only a sample. It is not meant to be some official
+ *     library. It is provided only as example code.
+ *
+ */
+
+o3djs.provide('o3djs.camera');
+
+o3djs.require('o3djs.util');
+o3djs.require('o3djs.math');
+
+/**
+ * A Module for camera utilites.
+ * @namespace
+ */
+o3djs.camera = o3djs.camera || {};
+
+/**
+ * Class to hold Camera information.
+ * @constructor
+ * @param {!o3djs.math.Matrix4} view The 4-by-4 view matrix.
+ * @param {number} zNear near z plane.
+ * @param {number} zFar far z plane.
+ * @param {!o3djs.math.Vector3} opt_eye The eye position.
+ * @param {!o3djs.math.Vector3} opt_target The target position.
+ * @param {!o3djs.math.Vector3} opt_up The up vector.
+ */
+o3djs.camera.CameraInfo = function(view,
+                                   zNear,
+                                   zFar,
+                                   opt_eye,
+                                   opt_target,
+                                   opt_up) {
+  /**
+   * View Matrix.
+   * @type {!o3djs.math.Matrix4}
+   */
+  this.view = view;
+
+  /**
+   * Projection Matrix.
+   * @type {!o3djs.math.Matrix4}
+   */
+  this.projection = o3djs.math.matrix4.identity();
+
+  /**
+   * Projection is orthographic.
+   * @type {boolean}
+   */
+  this.orthographic = false;
+
+  /**
+   * Near z plane.
+   * @type {number}
+   */
+  this.zNear = zNear;
+
+  /**
+   * Far z plane.
+   * @type {number}
+   */
+  this.zFar = zFar;
+
+  /**
+   * Field of view in radians.
+   * @type {number}
+   */
+  this.fieldOfViewRadians = o3djs.math.degToRad(30);
+
+  /**
+   * Eye position.
+   * @type {(!o3djs.math.Vector3|undefined)}
+   */
+  this.eye = opt_eye;
+
+  /**
+   * Target position.
+   * @type {(!o3djs.math.Vector3|undefined)}
+   */
+  this.target = opt_target;
+
+  /**
+   * Up Vector.
+   * @type {(!o3djs.math.Vector3|undefined)}
+   */
+  this.up = opt_up;
+
+  /**
+   * horizontal magnification for an orthographic view.
+   * @type {(number|undefined)}
+   */
+  this.magX = undefined;
+
+  /**
+   * vertical magnification for an orthographic view.
+   * @type {(number|undefined)}
+   */
+  this.magY = undefined;
+};
+
+/**
+ * Sets the CameraInfo to an orthographic camera.
+ * @param {number} magX horizontal magnification.
+ * @param {number} magY vertical magnification.
+ */
+o3djs.camera.CameraInfo.prototype.setAsOrthographic = function(
+    magX, magY) {
+  this.orthographic = true
+  this.magX = magX;
+  this.magY = magY;
+};
+
+/**
+ * Sets the CameraInfo to an orthographic camera.
+ * @param {number} fieldOfView Field of view in radians.
+ */
+o3djs.camera.CameraInfo.prototype.setAsPerspective = function(
+    fieldOfView) {
+  this.orthographic = false;
+  this.fieldOfViewRadians = fieldOfView;
+};
+
+/**
+ * Computes a projection matrix for this CameraInfo using the areaWidth
+ * and areaHeight passed in.
+ *
+ * @param {number} areaWidth width of client area.
+ * @param {number} areaHeight heigh of client area.
+ * @return {!o3djs.math.Matrix4} The computed projection matrix.
+ */
+o3djs.camera.CameraInfo.prototype.computeProjection = function(
+    areaWidth,
+    areaHeight) {
+  if (this.orthographic) {
+    // TODO: figure out if there is a way to make this take the areaWidth
+    //     and areaHeight into account. As it is, magX and magY from the
+    //     collada file are relative to the aspect ratio of Maya's render
+    //     settings which are not available here.
+    // var magX = areaWidth * 0.5 / this.magX;
+    // var magY = areaHeight * 0.5 / this.magY;
+    var magX = /** @type {number} */ (this.magX);
+    var magY = /** @type {number} */ (this.magY);
+    this.projection = o3djs.math.matrix4.orthographic(
+        -magX, magX, -magY, magY, this.zNear, this.zFar);
+  } else {
+    this.projection = o3djs.math.matrix4.perspective(
+        this.fieldOfViewRadians,  // field of view.
+        areaWidth / areaHeight,   // Aspect ratio.
+        this.zNear,               // Near plane.
+        this.zFar);               // Far plane.
+  }
+  return this.projection;
+};
+
+/**
+ * Searches for all nodes with a "o3d.tags" ParamString
+ * that contains the word "camera" assuming comma separated
+ * words.
+ * @param {!o3d.Transform} treeRoot Root of tree to search for cameras.
+ * @return {!Array.<!o3d.Transform>} Array of camera transforms.
+ */
+o3djs.camera.findCameras = function(treeRoot) {
+  return o3djs.util.getTransformsInTreeByTags(treeRoot, 'camera');
+};
+
+/**
+ * Creates a object with view and projection matrices using paramters found on
+ * the camera 'o3d.projection_near_z', 'o3d.projection_far_z', and
+ * 'o3d.perspective_fov_y' as well as the areaWidth and areaHeight passed
+ * in.
+ * @param {!o3d.Transform} camera Transform with camera information on it.
+ * @param {number} areaWidth width of client area.
+ * @param {number} areaHeight height of client area.
+ * @return {!o3djs.camera.CameraInfo} A CameraInfo object.
+ */
+o3djs.camera.getViewAndProjectionFromCamera = function(camera,
+                                                       areaWidth,
+                                                       areaHeight) {
+  var fieldOfView = 30;
+  var zNear = 1;
+  var zFar = 5000;
+  var eye = undefined;
+  var target = undefined;
+  var up = undefined;
+  var view;
+  var math = o3djs.math;
+  var cameraInfo;
+
+  // Check if any LookAt elements were found for the camera and use their
+  // values to compute a view matrix.
+  var eyeParam = camera.getParam('collada.eyePosition');
+  var targetParam = camera.getParam('collada.targetPosition');
+  var upParam = camera.getParam('collada.upVector');
+  if (eyeParam != null && targetParam != null && upParam != null) {
+    eye = eyeParam.value;
+    target = targetParam.value;
+    up = upParam.value;
+    view = math.matrix4.lookAt(eye, target, up);
+  } else {
+    // Set it to the orientation of the camera.
+    view = math.inverse(camera.getUpdatedWorldMatrix());
+  }
+
+  var projectionType = camera.getParam('collada.projectionType');
+  if (projectionType) {
+    zNear = camera.getParam('collada.projectionNearZ').value;
+    zFar = camera.getParam('collada.projectionFarZ').value;
+
+    if (projectionType.value == 'orthographic') {
+      var magX = camera.getParam('collada.projectionMagX').value;
+      var magY = camera.getParam('collada.projectionMagY').value;
+
+      cameraInfo = new o3djs.camera.CameraInfo(view, zNear, zFar);
+      cameraInfo.setAsOrthographic(magX, magY);
+    } else if (projectionType.value == 'perspective') {
+      fieldOfView = camera.getParam('collada.perspectiveFovY').value;
+    }
+  }
+
+  if (!cameraInfo) {
+    cameraInfo = new o3djs.camera.CameraInfo(view, zNear, zFar,
+                                                  eye, target, up);
+    cameraInfo.setAsPerspective(math.degToRad(fieldOfView));
+  }
+
+  cameraInfo.computeProjection(areaWidth, areaHeight);
+  return cameraInfo;
+};
+
+/**
+ * Get CameraInfo that represents a view of the bounding box that encompasses
+ * a tree of transforms.
+ * @param {!o3d.Transform} treeRoot Root of sub tree to get extents from.
+ * @param {number} clientWidth width of client area.
+ * @param {number} clientHeight height of client area.
+ * @return {!o3djs.camera.CameraInfo} A CameraInfo object.
+ */
+o3djs.camera.getCameraFitToScene = function(treeRoot,
+                                            clientWidth,
+                                            clientHeight) {
+  var math = o3djs.math;
+  var box = o3djs.util.getBoundingBoxOfTree(treeRoot);
+  var target = math.lerpVector(box.minExtent, box.maxExtent, 0.5);
+  var boxDimensions = math.subVector(box.maxExtent, box.minExtent);
+  var diag = o3djs.math.distance(box.minExtent, box.maxExtent);
+  var eye = math.addVector(target, [boxDimensions[0] * 0.3,
+                                    boxDimensions[1] * 0.7,
+                                    diag * 1.5]);
+  var nearPlane = diag / 1000;
+  var farPlane = diag * 10;
+
+  var up = [0, 1, 0];
+  var cameraInfo = new o3djs.camera.CameraInfo(
+      math.matrix4.lookAt(eye, target, up),
+      nearPlane,
+      farPlane);
+
+  cameraInfo.setAsPerspective(math.degToRad(45));
+  cameraInfo.computeProjection(clientWidth, clientHeight);
+  return cameraInfo;
+};
+
+/**
+ * Calls findCameras and takes the first camera. Then calls
+ * o3djs.camera.getViewAndProjectionFromCamera. If no camera is found it
+ * sets up some defaults.
+ * @param {!o3d.Transform} treeRoot Root of tree to search for cameras.
+ * @param {number} areaWidth Width of client area.
+ * @param {number} areaHeight Height of client area.
+ * @return {!o3djs.camera.CameraInfo} A CameraInfo object.
+ */
+o3djs.camera.getViewAndProjectionFromCameras = function(treeRoot,
+                                                        areaWidth,
+                                                        areaHeight) {
+  var cameras = o3djs.camera.findCameras(treeRoot);
+
+  if (cameras.length > 0) {
+    return o3djs.camera.getViewAndProjectionFromCamera(cameras[0],
+                                                       areaWidth,
+                                                       areaHeight);
+  } else {
+    // There was no camera in the file so make up a hopefully resonable default.
+    return o3djs.camera.getCameraFitToScene(treeRoot,
+                                            areaWidth,
+                                            areaHeight);
+  }
+};
+
+/**
+ * Calls findCameras and creates an array of CameraInfos for each camera found.
+ * @param {!o3d.Transform} treeRoot Root of tree to search for cameras.
+ * @param {number} areaWidth Width of client area.
+ * @param {number} areaHeight Height of client area.
+ * @return {!Array.<!o3djs.camera.CameraInfo>} A CameraInfo object.
+ */
+o3djs.camera.getCameraInfos = function(treeRoot, areaWidth, areaHeight) {
+  var cameras = o3djs.camera.findCameras(treeRoot);
+  var cameraInfos = [];
+
+  for (var cc = 0; cc < cameras.length; ++cc) {
+    cameraInfos.push(o3djs.camera.getViewAndProjectionFromCamera(
+        cameras[cc], areaWidth, areaHeight));
+  }
+  return cameraInfos;
+};
+
+/**
+ * Sets the view and projection of a DrawContext to view the bounding box
+ * that encompasses the tree of transforms passed.
+ *
+ * This function is here to help debug a program by providing an easy way to
+ * attempt to get your content in front of the camera.
+ *
+ * @param {!o3d.Transform} treeRoot Root of sub tree to get extents from.
+ * @param {number} clientWidth width of client area.
+ * @param {number} clientHeight height of client area.
+ * @param {!o3d.DrawContext} drawContext DrawContext to set view and
+ *     projection on.
+ */
+o3djs.camera.fitContextToScene = function(treeRoot,
+                                          clientWidth,
+                                          clientHeight,
+                                          drawContext) {
+  var cameraInfo = o3djs.camera.getCameraFitToScene(treeRoot,
+                                                    clientWidth,
+                                                    clientHeight);
+  drawContext.view = cameraInfo.view;
+  drawContext.projection = cameraInfo.projection;
+};