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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/browser/vr/android/cardboard/cardboard_vr_device.h" |
| 6 |
| 7 #include <math.h> |
| 8 #include <algorithm> |
| 9 |
| 10 #include "base/android/jni_android.h" |
| 11 #include "base/android/jni_array.h" |
| 12 #include "base/android/jni_string.h" |
| 13 #include "base/strings/string_util.h" |
| 14 #include "base/strings/utf_string_conversions.h" |
| 15 #include "base/time/time.h" |
| 16 #include "jni/CardboardVRDevice_jni.h" |
| 17 |
| 18 using base::android::AttachCurrentThread; |
| 19 |
| 20 namespace content { |
| 21 |
| 22 namespace { |
| 23 |
| 24 // Source: http://www.euclideanspace.com/maths/geometry/rotations/conversions/ma
trixToQuaternion/ |
| 25 VRVector4Ptr MatrixToOrientationQuat(const float m[16]) { |
| 26 VRVector4Ptr out = VRVector4::New(); |
| 27 float trace = m[0] + m[5] + m[10]; |
| 28 float root; |
| 29 if (trace > 0.0f) { |
| 30 root = sqrtf(1.0f + trace) * 2.0f; |
| 31 out->x = (m[9] - m[6]) / root; |
| 32 out->y = (m[2] - m[8]) / root; |
| 33 out->z = (m[4] - m[1]) / root; |
| 34 out->w = 0.25f * root; |
| 35 } else if ((m[0] > m[5]) && (m[0] > m[10])) { |
| 36 root = sqrtf(1.0f + m[0] - m[5] - m[10]) * 2.0f; |
| 37 out->x = 0.25f * root; |
| 38 out->y = (m[1] + m[4]) / root; |
| 39 out->z = (m[2] + m[8]) / root; |
| 40 out->w = (m[9] - m[6]) / root; |
| 41 } else if (m[5] > m[10]) { |
| 42 root = sqrtf(1.0f + m[5] - m[0] - m[10]) * 2.0f; |
| 43 out->x = (m[1] + m[4]) / root; |
| 44 out->y = 0.25f * root; |
| 45 out->z = (m[6] + m[9]) / root; |
| 46 out->w = (m[2] - m[8]) / root; |
| 47 } else { |
| 48 root = sqrtf(1.0f + m[10] - m[0] - m[5]) * 2.0f; |
| 49 out->x = (m[2] + m[8]) / root; |
| 50 out->y = (m[6] + m[9]) / root; |
| 51 out->z = 0.25f * root; |
| 52 out->w = (m[4] - m[1]) / root; |
| 53 } |
| 54 |
| 55 return out.Pass(); |
| 56 } |
| 57 |
| 58 } // namespace |
| 59 |
| 60 bool CardboardVRDevice::RegisterCardboardVRDevice(JNIEnv* env) { |
| 61 return RegisterNativesImpl(env); |
| 62 } |
| 63 |
| 64 CardboardVRDevice::CardboardVRDevice(VRDeviceProvider* provider) |
| 65 : VRDevice(provider), frame_index_(0) { |
| 66 j_cardboard_device_.Reset(Java_CardboardVRDevice_create( |
| 67 AttachCurrentThread(), base::android::GetApplicationContext())); |
| 68 } |
| 69 |
| 70 CardboardVRDevice::~CardboardVRDevice() { |
| 71 Java_CardboardVRDevice_stopTracking(AttachCurrentThread(), |
| 72 j_cardboard_device_.obj()); |
| 73 } |
| 74 |
| 75 VRDeviceInfoPtr CardboardVRDevice::GetVRDevice() { |
| 76 VRDeviceInfoPtr device = VRDeviceInfo::New(); |
| 77 |
| 78 JNIEnv* env = AttachCurrentThread(); |
| 79 |
| 80 ScopedJavaLocalRef<jstring> j_device_name = |
| 81 Java_CardboardVRDevice_getDeviceName(env, j_cardboard_device_.obj()); |
| 82 device->deviceName = base::android::ConvertJavaStringToUTF8(env, |
| 83 j_device_name.obj()); |
| 84 |
| 85 ScopedJavaLocalRef<jfloatArray> j_fov(env, env->NewFloatArray(4)); |
| 86 Java_CardboardVRDevice_getFieldOfView(env, j_cardboard_device_.obj(), |
| 87 j_fov.obj()); |
| 88 |
| 89 std::vector<float> fov; |
| 90 base::android::JavaFloatArrayToFloatVector(env, j_fov.obj(), &fov); |
| 91 |
| 92 device->hmdInfo = VRHMDInfo::New(); |
| 93 VRHMDInfoPtr& hmdInfo = device->hmdInfo; |
| 94 |
| 95 hmdInfo->leftEye = VREyeParameters::New(); |
| 96 hmdInfo->rightEye = VREyeParameters::New(); |
| 97 VREyeParametersPtr& leftEye = hmdInfo->leftEye; |
| 98 VREyeParametersPtr& rightEye = hmdInfo->rightEye; |
| 99 |
| 100 leftEye->recommendedFieldOfView = VRFieldOfView::New(); |
| 101 leftEye->recommendedFieldOfView->upDegrees = fov[0]; |
| 102 leftEye->recommendedFieldOfView->downDegrees = fov[1]; |
| 103 leftEye->recommendedFieldOfView->leftDegrees = fov[2]; |
| 104 leftEye->recommendedFieldOfView->rightDegrees = fov[3]; |
| 105 |
| 106 // Cardboard devices always assume a mirrored FOV, so this is just the left |
| 107 // eye FOV with the left and right degrees swapped. |
| 108 rightEye->recommendedFieldOfView = VRFieldOfView::New(); |
| 109 rightEye->recommendedFieldOfView->upDegrees = fov[0]; |
| 110 rightEye->recommendedFieldOfView->downDegrees = fov[1]; |
| 111 rightEye->recommendedFieldOfView->leftDegrees = fov[3]; |
| 112 rightEye->recommendedFieldOfView->rightDegrees = fov[2]; |
| 113 |
| 114 // Cardboard does not support configurable FOV. |
| 115 leftEye->maximumFieldOfView = leftEye->recommendedFieldOfView.Clone(); |
| 116 rightEye->maximumFieldOfView = rightEye->recommendedFieldOfView.Clone(); |
| 117 leftEye->minimumFieldOfView = leftEye->recommendedFieldOfView.Clone(); |
| 118 rightEye->minimumFieldOfView = rightEye->recommendedFieldOfView.Clone(); |
| 119 |
| 120 float ipd = Java_CardboardVRDevice_getIpd(env, j_cardboard_device_.obj()); |
| 121 |
| 122 leftEye->eyeTranslation = VRVector3::New(); |
| 123 leftEye->eyeTranslation->x = ipd * -0.5f; |
| 124 leftEye->eyeTranslation->y = 0.0f; |
| 125 leftEye->eyeTranslation->z = 0.0f; |
| 126 |
| 127 rightEye->eyeTranslation = VRVector3::New(); |
| 128 rightEye->eyeTranslation->x = ipd * 0.5f; |
| 129 rightEye->eyeTranslation->y = 0.0f; |
| 130 rightEye->eyeTranslation->z = 0.0f; |
| 131 |
| 132 ScopedJavaLocalRef<jintArray> j_screen_size(env, env->NewIntArray(2)); |
| 133 Java_CardboardVRDevice_getScreenSize(env, j_cardboard_device_.obj(), |
| 134 j_screen_size.obj()); |
| 135 |
| 136 std::vector<int> screen_size; |
| 137 base::android::JavaIntArrayToIntVector(env, j_screen_size.obj(), |
| 138 &screen_size); |
| 139 |
| 140 leftEye->renderRect = VRRect::New(); |
| 141 leftEye->renderRect->x = 0; |
| 142 leftEye->renderRect->y = 0; |
| 143 leftEye->renderRect->width = screen_size[0] / 2.0; |
| 144 leftEye->renderRect->height = screen_size[1]; |
| 145 |
| 146 rightEye->renderRect = VRRect::New(); |
| 147 rightEye->renderRect->x = screen_size[0] / 2.0; |
| 148 rightEye->renderRect->y = 0; |
| 149 rightEye->renderRect->width = screen_size[0] / 2.0; |
| 150 rightEye->renderRect->height = screen_size[1]; |
| 151 |
| 152 return device.Pass(); |
| 153 } |
| 154 |
| 155 VRSensorStatePtr CardboardVRDevice::GetSensorState() { |
| 156 VRSensorStatePtr state = VRSensorState::New(); |
| 157 |
| 158 state->timestamp = base::Time::Now().ToJsTime(); |
| 159 state->frameIndex = frame_index_; |
| 160 |
| 161 JNIEnv* env = AttachCurrentThread(); |
| 162 ScopedJavaLocalRef<jfloatArray> j_head_matrix(env, env->NewFloatArray(16)); |
| 163 Java_CardboardVRDevice_getSensorState(env, j_cardboard_device_.obj(), |
| 164 j_head_matrix.obj()); |
| 165 |
| 166 std::vector<float> head_matrix; |
| 167 base::android::JavaFloatArrayToFloatVector(env, j_head_matrix.obj(), |
| 168 &head_matrix); |
| 169 |
| 170 state->orientation = MatrixToOrientationQuat(&head_matrix[0]); |
| 171 |
| 172 state->position = VRVector3::New(); |
| 173 state->position->x = -head_matrix[12]; |
| 174 state->position->y = head_matrix[13]; |
| 175 state->position->z = head_matrix[14]; |
| 176 |
| 177 frame_index_++; |
| 178 |
| 179 return state.Pass(); |
| 180 } |
| 181 |
| 182 void CardboardVRDevice::ResetSensor() { |
| 183 Java_CardboardVRDevice_resetSensor(AttachCurrentThread(), |
| 184 j_cardboard_device_.obj()); |
| 185 } |
| 186 |
| 187 } // namespace content |
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