Migrate WebVR Cardboard implementation to GVR

device/vr/android/cardboard/cardboard_vr_device.cc

-// Copyright 2015 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 "device/vr/android/cardboard/cardboard_vr_device.h"
-
-#include <math.h>
-#include <algorithm>
-
-#include "base/android/context_utils.h"
-#include "base/android/jni_android.h"
-#include "base/android/jni_array.h"
-#include "base/android/jni_string.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/time/time.h"
-#include "base/trace_event/trace_event.h"
-#include "jni/CardboardVRDevice_jni.h"
-#include "ui/gfx/transform.h"
-#include "ui/gfx/transform_util.h"
-
-using base::android::AttachCurrentThread;
-using base::android::ScopedJavaLocalRef;
-
-namespace device {
-
-CardboardVRDevice::CardboardVRDevice(VRDeviceProvider* provider)
-    : VRDevice(provider) {
-  JNIEnv* env = AttachCurrentThread();
-  j_cardboard_device_.Reset(Java_CardboardVRDevice_create(
-      env, base::android::GetApplicationContext()));
-  j_head_matrix_.Reset(env, env->NewFloatArray(16));
-}
-
-CardboardVRDevice::~CardboardVRDevice() {
-  Java_CardboardVRDevice_stopTracking(AttachCurrentThread(),
-                                      j_cardboard_device_.obj());
-}
-
-VRDisplayPtr CardboardVRDevice::GetVRDevice() {
-  TRACE_EVENT0("input", "CardboardVRDevice::GetVRDevice");
-  VRDisplayPtr device = VRDisplay::New();
-
-  JNIEnv* env = AttachCurrentThread();
-
-  ScopedJavaLocalRef<jstring> j_device_name =
-      Java_CardboardVRDevice_getDeviceName(env, j_cardboard_device_.obj());
-  device->displayName =
-      base::android::ConvertJavaStringToUTF8(env, j_device_name.obj());
-
-  ScopedJavaLocalRef<jfloatArray> j_fov(env, env->NewFloatArray(4));
-  Java_CardboardVRDevice_getFieldOfView(env, j_cardboard_device_.obj(),
-                                        j_fov.obj());
-
-  std::vector<float> fov;
-  base::android::JavaFloatArrayToFloatVector(env, j_fov.obj(), &fov);
-
-  device->capabilities = VRDisplayCapabilities::New();
-  device->capabilities->hasOrientation = true;
-  device->capabilities->hasPosition = false;
-  device->capabilities->hasExternalDisplay = false;
-  device->capabilities->canPresent = false;
-
-  device->leftEye = VREyeParameters::New();
-  device->rightEye = VREyeParameters::New();
-  VREyeParametersPtr& left_eye = device->leftEye;
-  VREyeParametersPtr& right_eye = device->rightEye;
-
-  left_eye->fieldOfView = VRFieldOfView::New();
-  left_eye->fieldOfView->upDegrees = fov[0];
-  left_eye->fieldOfView->downDegrees = fov[1];
-  left_eye->fieldOfView->leftDegrees = fov[2];
-  left_eye->fieldOfView->rightDegrees = fov[3];
-
-  // Cardboard devices always assume a mirrored FOV, so this is just the left
-  // eye FOV with the left and right degrees swapped.
-  right_eye->fieldOfView = VRFieldOfView::New();
-  right_eye->fieldOfView->upDegrees = fov[0];
-  right_eye->fieldOfView->downDegrees = fov[1];
-  right_eye->fieldOfView->leftDegrees = fov[3];
-  right_eye->fieldOfView->rightDegrees = fov[2];
-
-  float ipd = Java_CardboardVRDevice_getIpd(env, j_cardboard_device_.obj());
-
-  left_eye->offset = mojo::Array<float>::New(3);
-  left_eye->offset[0] = ipd * -0.5f;
-  left_eye->offset[1] = 0.0f;
-  left_eye->offset[2] = 0.0f;
-
-  right_eye->offset = mojo::Array<float>::New(3);
-  right_eye->offset[0] = ipd * 0.5f;
-  right_eye->offset[1] = 0.0f;
-  right_eye->offset[2] = 0.0f;
-
-  ScopedJavaLocalRef<jintArray> j_screen_size(env, env->NewIntArray(2));
-  Java_CardboardVRDevice_getScreenSize(env, j_cardboard_device_.obj(),
-                                       j_screen_size.obj());
-
-  std::vector<int> screen_size;
-  base::android::JavaIntArrayToIntVector(env, j_screen_size.obj(),
-                                         &screen_size);
-
-  left_eye->renderWidth = screen_size[0] / 2.0;
-  left_eye->renderHeight = screen_size[1];
-
-  right_eye->renderWidth = screen_size[0] / 2.0;
-  right_eye->renderHeight = screen_size[1];
-
-  return device;
-}
-
-VRPosePtr CardboardVRDevice::GetPose() {
-  TRACE_EVENT0("input", "CardboardVRDevice::GetSensorState");
-  VRPosePtr pose = VRPose::New();
-
-  pose->timestamp = base::Time::Now().ToJsTime();
-
-  JNIEnv* env = AttachCurrentThread();
-  Java_CardboardVRDevice_getSensorState(env, j_cardboard_device_.obj(),
-                                        j_head_matrix_.obj());
-
-  std::vector<float> head_matrix;
-  base::android::JavaFloatArrayToFloatVector(env, j_head_matrix_.obj(),
-                                             &head_matrix);
-
-  gfx::Transform transform(
-      head_matrix[0], head_matrix[1], head_matrix[2], head_matrix[3],
-      head_matrix[4], head_matrix[5], head_matrix[6], head_matrix[7],
-      head_matrix[8], head_matrix[9], head_matrix[10], head_matrix[11],
-      head_matrix[12], head_matrix[13], head_matrix[14], head_matrix[15]);
-
-  gfx::DecomposedTransform decomposed_transform;
-  gfx::DecomposeTransform(&decomposed_transform, transform);
-
-  pose->orientation = mojo::Array<float>::New(4);
-  pose->orientation[0] = decomposed_transform.quaternion[0];
-  pose->orientation[1] = decomposed_transform.quaternion[1];
-  pose->orientation[2] = decomposed_transform.quaternion[2];
-  pose->orientation[3] = decomposed_transform.quaternion[3];
-
-  pose->position = mojo::Array<float>::New(3);
-  pose->position[0] = decomposed_transform.translate[0];
-  pose->position[1] = decomposed_transform.translate[1];
-  pose->position[2] = decomposed_transform.translate[2];
-
-  return pose;
-}
-
-void CardboardVRDevice::ResetPose() {
-  Java_CardboardVRDevice_resetSensor(AttachCurrentThread(),
-                                     j_cardboard_device_.obj());
-}
-
-}  // namespace device