Refactor Vr activity into ChromeTabbedActivity.

chrome/browser/android/vr_shell/ui_elements.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/android/vr_shell/ui_elements.h"
+
+#include <cmath>
+#include <vector>
+
+#include "base/logging.h"
+
+namespace vr_shell {
+
+namespace {
+
+float getRayPlaneIntersection(gvr::Vec3f rayOrigin,
+                              gvr::Vec3f rayVector,
+                              gvr::Vec3f planeOrigin,
+                              gvr::Vec3f planeNormal) {
+  float denom = vr_shell::VectorDot(rayVector, planeNormal);
+  if (denom == 0) {
+    return -std::numeric_limits<float>::infinity();
+  }
+  gvr::Vec3f rel;
+  rel.x = rayOrigin.x - planeOrigin.x;
+  rel.y = rayOrigin.y - planeOrigin.y;
+  rel.z = rayOrigin.z - planeOrigin.z;
+
+  return -vr_shell::VectorDot(planeNormal, rel) / denom;
+}
+
+}  // namespace
+
+ReversibleTransform::ReversibleTransform() { SetIdentity(); }
+
+void ReversibleTransform::SetIdentity() {
+  setIdentityM(mToWorld);
+  setIdentityM(mFromWorld);
+  mOrientation.qx = mOrientation.qy = mOrientation.qz = 0.0f;
+  mOrientation.qw = 1.0f;
+}
+
+void ReversibleTransform::Rotate(gvr::Quatf quat) {
+  mOrientation = QuatMultiply(quat, mOrientation);
+
+  // TODO(klausw): use specialized rotation code? Constructing the matrix
+  // via axis-angle quaternion is inefficient.
+  gvr::Mat4f forward = QuatToMatrix(quat);
+  mToWorld = MatrixMul(forward, mToWorld);
+  gvr::Mat4f reverse = MatrixTranspose(forward);
+  mFromWorld = MatrixMul(mFromWorld, reverse);
+}
+
+void ReversibleTransform::Rotate(float ax, float ay, float az, float rad) {
+  // TODO(klausw): use specialized rotation code? Constructing the matrix
+  // via axis-angle quaternion is inefficient.
+  Rotate(QuatFromAxisAngle(ax, ay, az, rad));
+}
+
+void ReversibleTransform::Translate(float tx, float ty, float tz) {
+  translateM(mToWorld, mToWorld, tx, ty, tz);
+  translateMRight(mFromWorld, mFromWorld, -tx, -ty, -tz);
+}
+
+void ReversibleTransform::Scale(float sx, float sy, float sz) {
+  scaleM(mToWorld, mToWorld, sx, sy, sz);
+  scaleMRight(mFromWorld, mFromWorld, 1.0f / sx, 1.0f / sy, 1.0f / sz);
+}
+
+gvr::Vec3f WorldRectangle::getCenter() const {
+  const gvr::Vec3f origin = {0.0f, 0.0f, 0.0f};
+  return MatrixVectorMul(mTransform.mToWorld, origin);
+}
+
+gvr::Vec3f WorldRectangle::getNormal() const {
+  const gvr::Vec3f normalOrig = {0.0f, 0.0f, -1.0f};
+  return MatrixVectorRotate(mTransform.mToWorld, normalOrig);
+}
+
+float WorldRectangle::getRayDistance(gvr::Vec3f rayOrigin,
+                                     gvr::Vec3f rayVector) const {
+  return getRayPlaneIntersection(rayOrigin, rayVector, getCenter(),
+                                 getNormal());
+}
+
+ContentRectangle::ContentRectangle() {}
+
+ContentRectangle::~ContentRectangle() {}
+
+}  // namespace vr_shell
+