Updated Blink WebVR interfaces to WebVR v1 spec

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

+// 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 "modules/vr/VRDisplay.h"
+
+#include "core/dom/DOMException.h"
+#include "core/inspector/ConsoleMessage.h"
+#include "modules/vr/NavigatorVR.h"
+#include "modules/vr/VRController.h"
+#include "modules/vr/VRDisplayCapabilities.h"
+#include "modules/vr/VREyeParameters.h"
+#include "modules/vr/VRLayer.h"
+#include "modules/vr/VRPose.h"
+#include "modules/vr/VRStageParameters.h"
+#include "modules/webgl/WebGLRenderingContextBase.h"
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+namespace {
+
+VREye stringToVREye(const String& whichEye)
+{
+    if (whichEye == "left")
+        return VREyeLeft;
+    if (whichEye == "right")
+        return VREyeRight;
+    return VREyeNone;
+}
+
+} // namepspace
+
+VRDisplay::VRDisplay(NavigatorVR* navigatorVR)
+    : m_navigatorVR(navigatorVR)
+    , m_displayId(0)
+    , m_isConnected(false)
+    , m_isPresenting(false)
+    , m_canUpdateFramePose(true)
+    , m_capabilities(new VRDisplayCapabilities())
+    , m_eyeParametersLeft(new VREyeParameters())
+    , m_eyeParametersRight(new VREyeParameters())
+{
+}
+
+VRDisplay::~VRDisplay()
+{
+}
+
+VRController* VRDisplay::controller()
+{
+    return m_navigatorVR->controller();
+}
+
+void VRDisplay::updateFromWebVRDevice(const WebVRDevice& device)
+{
+    m_displayId = device.index;
+    m_displayName = device.deviceName;
+    m_isConnected = true;
+
+    // Defaults until the VR service has been update to query these.
+    m_capabilities->setHasOrientation(true);
+    m_capabilities->setHasPosition(false);
+    m_capabilities->setHasExternalDisplay(false);
+    m_capabilities->setCanPresent(false);
+    m_capabilities->setMaxLayers(0);
+
+    if (device.flags & WebVRDeviceTypeHMD) {
+        m_eyeParametersLeft->update(device.hmdInfo.leftEye);
+        m_eyeParametersRight->update(device.hmdInfo.rightEye);
+    }
+
+    m_stageParameters = nullptr;
+}
+
+VRPose* VRDisplay::getPose()
+{
+    if (m_canUpdateFramePose) {
+        m_framePose = getImmediatePose();
+        Platform::current()->currentThread()->addTaskObserver(this);
+        m_canUpdateFramePose = false;
+    }
+
+    return m_framePose;
+}
+
+VRPose* VRDisplay::getImmediatePose()
+{
+    WebHMDSensorState webPose;
+    controller()->getSensorState(m_displayId, webPose);
+
+    VRPose* pose = VRPose::create();
+    pose->setPose(webPose);
+    return pose;
+}
+
+void VRDisplay::resetPose()
+{
+    controller()->resetSensor(m_displayId);
+}
+
+VREyeParameters* VRDisplay::getEyeParameters(const String& whichEye)
+{
+    switch (stringToVREye(whichEye)) {
+    case VREyeLeft:
+        return m_eyeParametersLeft;
+    case VREyeRight:
+        return m_eyeParametersRight;
+    default:
+        return nullptr;
+    }
+}
+
+int VRDisplay::requestAnimationFrame(FrameRequestCallback* callback)
+{
+    // TODO: Use HMD-specific rAF when an external display is present.
+    callback->m_useLegacyTimeBase = false;
+    if (Document* doc = m_navigatorVR->document())
+        return doc->requestAnimationFrame(callback);
+    return 0;
+}
+
+void VRDisplay::cancelAnimationFrame(int id)
+{
+    if (Document* document = m_navigatorVR->document())
+        document->cancelAnimationFrame(id);
+}
+
+ScriptPromise VRDisplay::requestPresent(ScriptState* scriptState, const HeapVector<VRLayer>& layers)
+{
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+
+    if (!m_capabilities->canPresent()) {
+        DOMException* exception = DOMException::create(InvalidStateError, "VRDisplay cannot present");
+        resolver->reject(exception);
+        return promise;
+    }
+
+    if (layers.size() == 0 || layers.size() > m_capabilities->maxLayers()) {
+        DOMException* exception = DOMException::create(InvalidStateError, "Invalid number of layers.");
+        if (m_isPresenting) {
+            exitPresent(scriptState);
+        }
+        resolver->reject(exception);
+        return promise;
+    }
+
+    // TODO: Implement VR presentation
+    NOTIMPLEMENTED();
+
+    DOMException* exception = DOMException::create(InvalidStateError, "VR Presentation not implemented");
+    resolver->reject(exception);
+
+    return promise;
+}
+
+ScriptPromise VRDisplay::exitPresent(ScriptState* scriptState)
+{
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+
+    // Can't stop presenting if we're not presenting.
+    DOMException* exception = DOMException::create(InvalidStateError, "VRDisplay is not presenting");
+    resolver->reject(exception);
+    return promise;
+}
+
+HeapVector<VRLayer> VRDisplay::getLayers()
+{
+    HeapVector<VRLayer> layers;
+    return layers;
+}
+
+void VRDisplay::submitFrame(VRPose* pose)
+{
+    NOTIMPLEMENTED();
+}
+
+void VRDisplay::didProcessTask()
+{
+    // Pose should be stable until control is returned to the user agent.
+    if (!m_canUpdateFramePose) {
+        Platform::current()->currentThread()->removeTaskObserver(this);
+        m_canUpdateFramePose = true;
+    }
+}
+
+DEFINE_TRACE(VRDisplay)
+{
+    visitor->trace(m_navigatorVR);
+    visitor->trace(m_capabilities);
+    visitor->trace(m_stageParameters);
+    visitor->trace(m_eyeParametersLeft);
+    visitor->trace(m_eyeParametersRight);
+    visitor->trace(m_framePose);
+}
+
+} // namespace blink