Adding WebVR interface to Blink

Source/modules/vr/VRHardwareUnit.cpp

Index: Source/modules/vr/VRHardwareUnit.cpp
diff --git a/Source/modules/vr/VRHardwareUnit.cpp b/Source/modules/vr/VRHardwareUnit.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e5864d0c8ae38d4c14f40c0ae58cb2f554d2110b
--- /dev/null
+++ b/Source/modules/vr/VRHardwareUnit.cpp
@@ -0,0 +1,114 @@
+// Copyright 2014 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 "config.h"
+#include "modules/vr/VRHardwareUnit.h"
+
+#include "modules/vr/HMDVRDevice.h"
+#include "modules/vr/PositionSensorVRDevice.h"
+#include "modules/vr/VRDevice.h"
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+VRHardwareUnit::VRHardwareUnit()
+    : m_frameIndex(0)
+{
+    m_positionState = VRPositionState::create();
+    m_currentFOVLeft = new VRFieldOfView();
+    m_currentFOVRight = new VRFieldOfView();
+}
+
+VRHardwareUnit::~VRHardwareUnit()
+{
+}
+
+void VRHardwareUnit::updateFromWebVRDevice(const WebVRDevice& device)
+{
+    m_index = device.index;
+    m_hardwareUnitId = device.deviceId;
+
+    if (device.flags & WebVRDeviceTypeHMD) {
+        if (!m_hmd.get())

[sof, 2015/02/24 12:35:29]

get() is redundant (here and for other Member<> boolean uses here.)

+            m_hmd = new HMDVRDevice(this);
+        m_hmd->updateFromWebVRDevice(device);
+    } else if (m_hmd.get()) {
+        m_hmd.clear();
+    }
+
+    if (device.flags & WebVRDeviceTypePosition) {
+        if (!m_positionSensor.get())
+            m_positionSensor = new PositionSensorVRDevice(this);
+        m_positionSensor->updateFromWebVRDevice(device);
+    } else if (m_positionSensor.get()) {
+        m_positionSensor.clear();
+    }
+}
+
+void VRHardwareUnit::addDevicesToVector(HeapVector<Member<VRDevice>>& vrDevices)

[Ken Russell (switch to Gerrit), 2015/02/23 19:39:32]

Please make sure to get a review from someone who works on Oilpan regarding the
HeapVector and Member use here and throughout.

+{
+    if (m_hmd.get())
+        vrDevices.append(m_hmd);
+
+    if (m_positionSensor.get())
+        vrDevices.append(m_positionSensor);
+}
+
+VRPositionState* VRHardwareUnit::getPositionState(double timeOffset)
+{
+    blink::WebHMDSensorState state;
+    blink::Platform::current()->getHMDSensorState(m_index, timeOffset, state);
+
+    m_positionState->setState(state);
+    m_frameIndex = state.frameIndex;
+
+    return m_positionState;
+}
+
+void VRHardwareUnit::setFieldOfView(unsigned eyeIndex, VRFieldOfView* fov)
+{
+    switch (eyeIndex) {
+    case 0:
+        m_currentFOVLeft->setFromVRFieldOfView(*fov);
+        break;
+    case 1:
+        m_currentFOVRight->setFromVRFieldOfView(*fov);
+        break;
+    }

[sof, 2015/02/24 12:35:29]

Appropriate to have a default: case here?

+}
+
+VRFieldOfView* VRHardwareUnit::getCurrentEyeFieldOfView(unsigned eyeIndex) const
+{
+    switch (eyeIndex) {
+    case 0:
+        return new VRFieldOfView(*m_currentFOVLeft);
+    case 1:
+        return new VRFieldOfView(*m_currentFOVRight);
+    default:
+        return 0;
+    }
+}
+
+WebVRFieldOfView VRHardwareUnit::getFieldOfView(unsigned eyeIndex) const
+{
+    VRFieldOfView* srcFov = eyeIndex == 0 ? m_currentFOVLeft : m_currentFOVRight;
+
+    blink::WebVRFieldOfView fov;
+    fov.upDegrees = srcFov->upDegrees();
+    fov.downDegrees = srcFov->downDegrees();
+    fov.leftDegrees = srcFov->leftDegrees();
+    fov.rightDegrees = srcFov->rightDegrees();
+    return fov;
+}
+
+void VRHardwareUnit::trace(Visitor* visitor)
+{
+    visitor->trace(m_positionState);
+    visitor->trace(m_currentFOVLeft);
+    visitor->trace(m_currentFOVRight);
+    visitor->trace(m_hmd);
+    visitor->trace(m_positionSensor);
+}
+
+} // namespace blink