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gecko-dev/dom/vr/VRDisplay.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsWrapperCache.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/UserActivation.h"
#include "mozilla/dom/VRDisplay.h"
#include "mozilla/dom/VRDisplayBinding.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/Base64.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "Navigator.h"
#include "gfxUtils.h"
#include "gfxVR.h"
#include "VRDisplayClient.h"
#include "VRManagerChild.h"
#include "VRDisplayPresentation.h"
#include "nsIObserverService.h"
#include "nsISupportsPrimitives.h"
#include "nsGlobalWindowInner.h"
using namespace mozilla::gfx;
namespace mozilla::dom {
VRFieldOfView::VRFieldOfView(nsISupports* aParent, double aUpDegrees,
double aRightDegrees, double aDownDegrees,
double aLeftDegrees)
: mParent(aParent),
mUpDegrees(aUpDegrees),
mRightDegrees(aRightDegrees),
mDownDegrees(aDownDegrees),
mLeftDegrees(aLeftDegrees) {}
VRFieldOfView::VRFieldOfView(nsISupports* aParent,
const gfx::VRFieldOfView& aSrc)
: mParent(aParent),
mUpDegrees(aSrc.upDegrees),
mRightDegrees(aSrc.rightDegrees),
mDownDegrees(aSrc.downDegrees),
mLeftDegrees(aSrc.leftDegrees) {}
bool VRDisplayCapabilities::HasPosition() const {
return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
}
bool VRDisplayCapabilities::HasOrientation() const {
return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
}
bool VRDisplayCapabilities::HasExternalDisplay() const {
return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_External);
}
bool VRDisplayCapabilities::CanPresent() const {
return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Present);
}
uint32_t VRDisplayCapabilities::MaxLayers() const {
return CanPresent() ? 1 : 0;
}
void VRDisplay::UpdateDisplayClient(
already_AddRefed<gfx::VRDisplayClient> aClient) {
mClient = std::move(aClient);
}
/*static*/
bool VRDisplay::RefreshVRDisplays(uint64_t aWindowId) {
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
return vm && vm->RefreshVRDisplaysWithCallback(aWindowId);
}
/*static*/
void VRDisplay::UpdateVRDisplays(nsTArray<RefPtr<VRDisplay>>& aDisplays,
nsPIDOMWindowInner* aWindow) {
nsTArray<RefPtr<VRDisplay>> displays;
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
nsTArray<RefPtr<gfx::VRDisplayClient>> updatedDisplays;
if (vm) {
vm->GetVRDisplays(updatedDisplays);
for (size_t i = 0; i < updatedDisplays.Length(); i++) {
RefPtr<gfx::VRDisplayClient> display = updatedDisplays[i];
bool isNewDisplay = true;
for (size_t j = 0; j < aDisplays.Length(); j++) {
if (aDisplays[j]->GetClient()->GetDisplayInfo().GetDisplayID() ==
display->GetDisplayInfo().GetDisplayID()) {
displays.AppendElement(aDisplays[j]);
isNewDisplay = false;
} else {
RefPtr<gfx::VRDisplayClient> ref = display;
aDisplays[j]->UpdateDisplayClient(do_AddRef(display));
displays.AppendElement(aDisplays[j]);
isNewDisplay = false;
}
}
if (isNewDisplay) {
displays.AppendElement(new VRDisplay(aWindow, display));
}
}
}
aDisplays = std::move(displays);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRFieldOfView, mParent)
JSObject* VRFieldOfView::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRFieldOfView_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WITH_JS_MEMBERS(VREyeParameters,
(mParent, mFOV),
(mOffset))
VREyeParameters::VREyeParameters(nsISupports* aParent,
const gfx::Point3D& aEyeTranslation,
const gfx::VRFieldOfView& aFOV,
const gfx::IntSize& aRenderSize)
: mParent(aParent),
mEyeTranslation(aEyeTranslation),
mRenderSize(aRenderSize) {
mFOV = new VRFieldOfView(aParent, aFOV);
mozilla::HoldJSObjects(this);
}
VREyeParameters::~VREyeParameters() { mozilla::DropJSObjects(this); }
VRFieldOfView* VREyeParameters::FieldOfView() { return mFOV; }
void VREyeParameters::GetOffset(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
if (!mOffset) {
// Lazily create the Float32Array
mOffset =
dom::Float32Array::Create(aCx, this, mEyeTranslation.components, aRv);
if (aRv.Failed()) {
return;
}
}
aRetval.set(mOffset);
}
JSObject* VREyeParameters::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VREyeParameters_Binding::Wrap(aCx, this, aGivenProto);
}
VRStageParameters::VRStageParameters(
nsISupports* aParent, const gfx::Matrix4x4& aSittingToStandingTransform,
const gfx::Size& aSize)
: mParent(aParent),
mSittingToStandingTransform(aSittingToStandingTransform),
mSittingToStandingTransformArray(nullptr),
mSize(aSize) {
mozilla::HoldJSObjects(this);
}
VRStageParameters::~VRStageParameters() { mozilla::DropJSObjects(this); }
JSObject* VRStageParameters::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRStageParameters_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(VRStageParameters)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRStageParameters)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
tmp->mSittingToStandingTransformArray = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRStageParameters)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRStageParameters)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(
mSittingToStandingTransformArray)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
void VRStageParameters::GetSittingToStandingTransform(
JSContext* aCx, JS::MutableHandle<JSObject*> aRetval, ErrorResult& aRv) {
if (!mSittingToStandingTransformArray) {
// Lazily create the Float32Array
mSittingToStandingTransformArray = dom::Float32Array::Create(
aCx, this, mSittingToStandingTransform.components, aRv);
if (aRv.Failed()) {
return;
}
}
aRetval.set(mSittingToStandingTransformArray);
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRDisplayCapabilities, mParent)
JSObject* VRDisplayCapabilities::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRDisplayCapabilities_Binding::Wrap(aCx, this, aGivenProto);
}
VRPose::VRPose(nsISupports* aParent, const gfx::VRHMDSensorState& aState)
: Pose(aParent), mVRState(aState) {
mozilla::HoldJSObjects(this);
}
VRPose::VRPose(nsISupports* aParent) : Pose(aParent) {
mVRState.inputFrameID = 0;
mVRState.timestamp = 0.0;
mVRState.flags = gfx::VRDisplayCapabilityFlags::Cap_None;
mozilla::HoldJSObjects(this);
}
VRPose::~VRPose() { mozilla::DropJSObjects(this); }
void VRPose::GetPosition(JSContext* aCx, JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid =
bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
bool(mVRState.flags &
gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
SetFloat32Array(aCx, this, aRetval, mPosition,
valid ? mVRState.pose.position.data() : nullptr, 3, aRv);
}
void VRPose::GetLinearVelocity(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid =
bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
bool(mVRState.flags &
gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
SetFloat32Array(aCx, this, aRetval, mLinearVelocity,
valid ? mVRState.pose.linearVelocity.data() : nullptr, 3,
aRv);
}
void VRPose::GetLinearAcceleration(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid = bool(
mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_LinearAcceleration);
SetFloat32Array(aCx, this, aRetval, mLinearAcceleration,
valid ? mVRState.pose.linearAcceleration.data() : nullptr, 3,
aRv);
}
void VRPose::GetOrientation(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid =
bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
SetFloat32Array(aCx, this, aRetval, mOrientation,
valid ? mVRState.pose.orientation.data() : nullptr, 4, aRv);
}
void VRPose::GetAngularVelocity(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid =
bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
SetFloat32Array(aCx, this, aRetval, mAngularVelocity,
valid ? mVRState.pose.angularVelocity.data() : nullptr, 3,
aRv);
}
void VRPose::GetAngularAcceleration(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
const bool valid = bool(
mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_AngularAcceleration);
SetFloat32Array(aCx, this, aRetval, mAngularAcceleration,
valid ? mVRState.pose.angularAcceleration.data() : nullptr, 3,
aRv);
}
void VRPose::Update(const gfx::VRHMDSensorState& aState) { mVRState = aState; }
JSObject* VRPose::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRPose_Binding::Wrap(aCx, this, aGivenProto);
}
/* virtual */
JSObject* VRDisplay::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRDisplay_Binding::Wrap(aCx, this, aGivenProto);
}
VRDisplay::VRDisplay(nsPIDOMWindowInner* aWindow, gfx::VRDisplayClient* aClient)
: DOMEventTargetHelper(aWindow),
mClient(aClient),
mDepthNear(0.01f) // Default value from WebVR Spec
,
mDepthFar(10000.0f) // Default value from WebVR Spec
,
mVRNavigationEventDepth(0),
mShutdown(false) {
const gfx::VRDisplayInfo& info = aClient->GetDisplayInfo();
mCapabilities = new VRDisplayCapabilities(aWindow, info.GetCapabilities());
if (info.GetCapabilities() &
gfx::VRDisplayCapabilityFlags::Cap_StageParameters) {
mStageParameters = new VRStageParameters(
aWindow, info.GetSittingToStandingTransform(), info.GetStageSize());
}
mozilla::HoldJSObjects(this);
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (MOZ_LIKELY(obs)) {
obs->AddObserver(this, "inner-window-destroyed", false);
}
}
VRDisplay::~VRDisplay() {
MOZ_ASSERT(mShutdown);
mozilla::DropJSObjects(this);
}
void VRDisplay::LastRelease() {
// We don't want to wait for the CC to free up the presentation
// for use in other documents, so we do this in LastRelease().
Shutdown();
}
already_AddRefed<VREyeParameters> VRDisplay::GetEyeParameters(VREye aEye) {
gfx::VRDisplayState::Eye eye = aEye == VREye::Left
? gfx::VRDisplayState::Eye_Left
: gfx::VRDisplayState::Eye_Right;
RefPtr<VREyeParameters> params = new VREyeParameters(
GetParentObject(), mClient->GetDisplayInfo().GetEyeTranslation(eye),
mClient->GetDisplayInfo().GetEyeFOV(eye),
mClient->GetDisplayInfo().SuggestedEyeResolution());
return params.forget();
}
VRDisplayCapabilities* VRDisplay::Capabilities() { return mCapabilities; }
VRStageParameters* VRDisplay::GetStageParameters() { return mStageParameters; }
uint32_t VRDisplay::DisplayId() const {
const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
return info.GetDisplayID();
}
void VRDisplay::GetDisplayName(nsAString& aDisplayName) const {
const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
CopyUTF8toUTF16(MakeStringSpan(info.GetDisplayName()), aDisplayName);
}
void VRDisplay::UpdateFrameInfo() {
/**
* The WebVR 1.1 spec Requires that VRDisplay.getPose and
* VRDisplay.getFrameData must return the same values until the next
* VRDisplay.submitFrame.
*
* mFrameInfo is marked dirty at the end of the frame or start of a new
* composition and lazily created here in order to receive mid-frame
* pose-prediction updates while still ensuring conformance to the WebVR spec
* requirements.
*
* If we are not presenting WebVR content, the frame will never end and we
* should return the latest frame data always.
*/
mFrameInfo.Clear();
if ((mFrameInfo.IsDirty() && IsPresenting()) ||
mClient->GetDisplayInfo().GetPresentingGroups() == 0) {
const gfx::VRHMDSensorState& state = mClient->GetSensorState();
const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
mFrameInfo.Update(info, state, mDepthNear, mDepthFar);
}
}
bool VRDisplay::GetFrameData(VRFrameData& aFrameData) {
UpdateFrameInfo();
if (!(mFrameInfo.mVRState.flags &
gfx::VRDisplayCapabilityFlags::Cap_Orientation)) {
// We must have at minimum Cap_Orientation for a valid pose.
return false;
}
aFrameData.Update(mFrameInfo);
return true;
}
already_AddRefed<VRPose> VRDisplay::GetPose() {
UpdateFrameInfo();
RefPtr<VRPose> obj = new VRPose(GetParentObject(), mFrameInfo.mVRState);
return obj.forget();
}
void VRDisplay::ResetPose() {
// ResetPose is deprecated and unimplemented
// We must keep this stub function around as its referenced by
// VRDisplay.webidl. Not asserting here, as that could break existing web
// content.
}
void VRDisplay::StartVRNavigation() { mClient->StartVRNavigation(); }
void VRDisplay::StartHandlingVRNavigationEvent() {
mHandlingVRNavigationEventStart = TimeStamp::Now();
++mVRNavigationEventDepth;
TimeDuration timeout =
TimeDuration::FromMilliseconds(StaticPrefs::dom_vr_navigation_timeout());
// A 0 or negative TimeDuration indicates that content may take
// as long as it wishes to respond to the event, as long as
// it happens before the event exits.
if (timeout.ToMilliseconds() > 0) {
mClient->StopVRNavigation(timeout);
}
}
void VRDisplay::StopHandlingVRNavigationEvent() {
MOZ_ASSERT(mVRNavigationEventDepth > 0);
--mVRNavigationEventDepth;
if (mVRNavigationEventDepth == 0) {
mClient->StopVRNavigation(TimeDuration::FromMilliseconds(0));
}
}
bool VRDisplay::IsHandlingVRNavigationEvent() {
if (mVRNavigationEventDepth == 0) {
return false;
}
if (mHandlingVRNavigationEventStart.IsNull()) {
return false;
}
TimeDuration timeout =
TimeDuration::FromMilliseconds(StaticPrefs::dom_vr_navigation_timeout());
return timeout.ToMilliseconds() <= 0 ||
(TimeStamp::Now() - mHandlingVRNavigationEventStart) <= timeout;
}
void VRDisplay::OnPresentationGenerationChanged() { ExitPresentInternal(); }
already_AddRefed<Promise> VRDisplay::RequestPresent(
const nsTArray<VRLayer>& aLayers, CallerType aCallerType,
ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = GetParentObject();
if (!global) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
RefPtr<Promise> promise = Promise::Create(global, aRv);
NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
bool isChromePresentation = aCallerType == CallerType::System;
uint32_t presentationGroup =
isChromePresentation ? gfx::kVRGroupChrome : gfx::kVRGroupContent;
mClient->SetXRAPIMode(gfx::VRAPIMode::WebVR);
if (!UserActivation::IsHandlingUserInput() && !isChromePresentation &&
!IsHandlingVRNavigationEvent() && StaticPrefs::dom_vr_require_gesture() &&
!IsPresenting()) {
// The WebVR API states that if called outside of a user gesture, the
// promise must be rejected. We allow VR presentations to start within
// trusted events such as vrdisplayactivate, which triggers in response to
// HMD proximity sensors and when navigating within a VR presentation.
// This user gesture requirement is not enforced for chrome/system code.
promise->MaybeRejectWithUndefined();
} else if (!IsPresenting() && IsAnyPresenting(presentationGroup)) {
// Only one presentation allowed per VRDisplay on a
// first-come-first-serve basis.
// If this Javascript context is presenting, then we can replace our
// presentation with a new one containing new layers but we should never
// replace the presentation of another context.
// Simultaneous presentations in other groups are allowed in separate
// Javascript contexts to enable browser UI from chrome/system contexts.
// Eventually, this restriction will be loosened to enable multitasking
// use cases.
promise->MaybeRejectWithUndefined();
} else {
if (mPresentation) {
mPresentation->UpdateLayers(aLayers);
} else {
mPresentation = mClient->BeginPresentation(aLayers, presentationGroup);
}
mFrameInfo.Clear();
promise->MaybeResolve(JS::UndefinedHandleValue);
}
return promise.forget();
}
NS_IMETHODIMP
VRDisplay::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(NS_IsMainThread());
if (strcmp(aTopic, "inner-window-destroyed") == 0) {
nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
uint64_t innerID;
nsresult rv = wrapper->GetData(&innerID);
NS_ENSURE_SUCCESS(rv, rv);
if (!GetOwnerWindow() || GetOwnerWindow()->WindowID() == innerID) {
Shutdown();
}
return NS_OK;
}
// This should not happen.
return NS_ERROR_FAILURE;
}
already_AddRefed<Promise> VRDisplay::ExitPresent(ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = GetParentObject();
if (!global) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
RefPtr<Promise> promise = Promise::Create(global, aRv);
NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
if (!IsPresenting()) {
// We can not exit a presentation outside of the context that
// started the presentation.
promise->MaybeRejectWithUndefined();
} else {
promise->MaybeResolve(JS::UndefinedHandleValue);
ExitPresentInternal();
}
return promise.forget();
}
void VRDisplay::ExitPresentInternal() { mPresentation = nullptr; }
void VRDisplay::Shutdown() {
mShutdown = true;
ExitPresentInternal();
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (MOZ_LIKELY(obs)) {
obs->RemoveObserver(this, "inner-window-destroyed");
}
}
void VRDisplay::GetLayers(nsTArray<VRLayer>& result) {
if (mPresentation) {
mPresentation->GetDOMLayers(result);
} else {
result = nsTArray<VRLayer>();
}
}
void VRDisplay::SubmitFrame() {
AUTO_PROFILER_TRACING_MARKER("VR", "SubmitFrameAtVRDisplay", OTHER);
if (mClient && !mClient->IsPresentationGenerationCurrent()) {
mPresentation = nullptr;
mClient->MakePresentationGenerationCurrent();
}
if (mPresentation) {
mPresentation->SubmitFrame();
}
mFrameInfo.Clear();
}
int32_t VRDisplay::RequestAnimationFrame(FrameRequestCallback& aCallback,
ErrorResult& aError) {
if (mShutdown) {
return 0;
}
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
int32_t handle;
aError = vm->ScheduleFrameRequestCallback(aCallback, &handle);
return handle;
}
void VRDisplay::CancelAnimationFrame(int32_t aHandle, ErrorResult& aError) {
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
vm->CancelFrameRequestCallback(aHandle);
}
bool VRDisplay::IsPresenting() const {
// IsPresenting returns true only if this Javascript context is presenting
// and will return false if another context is presenting.
return mPresentation != nullptr;
}
bool VRDisplay::IsAnyPresenting(uint32_t aGroupMask) const {
// IsAnyPresenting returns true if either this VRDisplay object or any other
// from anther Javascript context is presenting with a group matching
// aGroupMask.
if (mPresentation && (mPresentation->GetGroup() & aGroupMask)) {
return true;
}
if (mClient->GetDisplayInfo().GetPresentingGroups() & aGroupMask) {
return true;
}
return false;
}
bool VRDisplay::IsConnected() const { return mClient->GetIsConnected(); }
uint32_t VRDisplay::PresentingGroups() const {
return mClient->GetDisplayInfo().GetPresentingGroups();
}
uint32_t VRDisplay::GroupMask() const {
return mClient->GetDisplayInfo().GetGroupMask();
}
void VRDisplay::SetGroupMask(const uint32_t& aGroupMask) {
mClient->SetGroupMask(aGroupMask);
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(VRDisplay, DOMEventTargetHelper,
mCapabilities, mStageParameters)
NS_IMPL_ADDREF_INHERITED(VRDisplay, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(VRDisplay, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(VRDisplay)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, EventTarget)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_CLASS(VRFrameData)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRFrameData)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mPose)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
tmp->mLeftProjectionMatrix = nullptr;
tmp->mLeftViewMatrix = nullptr;
tmp->mRightProjectionMatrix = nullptr;
tmp->mRightViewMatrix = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRFrameData)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mPose)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRFrameData)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftProjectionMatrix)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftViewMatrix)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightProjectionMatrix)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightViewMatrix)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
VRFrameData::VRFrameData(nsISupports* aParent)
: mParent(aParent),
mLeftProjectionMatrix(nullptr),
mLeftViewMatrix(nullptr),
mRightProjectionMatrix(nullptr),
mRightViewMatrix(nullptr) {
mozilla::HoldJSObjects(this);
mPose = new VRPose(aParent);
}
VRFrameData::~VRFrameData() { mozilla::DropJSObjects(this); }
/* static */
already_AddRefed<VRFrameData> VRFrameData::Constructor(
const GlobalObject& aGlobal) {
RefPtr<VRFrameData> obj = new VRFrameData(aGlobal.GetAsSupports());
return obj.forget();
}
JSObject* VRFrameData::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return VRFrameData_Binding::Wrap(aCx, this, aGivenProto);
}
VRPose* VRFrameData::Pose() { return mPose; }
double VRFrameData::Timestamp() const {
// Converting from seconds to milliseconds
return mFrameInfo.mVRState.timestamp * 1000.0f;
}
void VRFrameData::GetLeftProjectionMatrix(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
Pose::SetFloat32Array(aCx, this, aRetval, mLeftProjectionMatrix,
mFrameInfo.mLeftProjection.components, 16, aRv);
}
void VRFrameData::GetLeftViewMatrix(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
Pose::SetFloat32Array(aCx, this, aRetval, mLeftViewMatrix,
mFrameInfo.mLeftView.components, 16, aRv);
}
void VRFrameData::GetRightProjectionMatrix(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
Pose::SetFloat32Array(aCx, this, aRetval, mRightProjectionMatrix,
mFrameInfo.mRightProjection.components, 16, aRv);
}
void VRFrameData::GetRightViewMatrix(JSContext* aCx,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
Pose::SetFloat32Array(aCx, this, aRetval, mRightViewMatrix,
mFrameInfo.mRightView.components, 16, aRv);
}
void VRFrameData::Update(const VRFrameInfo& aFrameInfo) {
mFrameInfo = aFrameInfo;
mPose->Update(mFrameInfo.mVRState);
}
void VRFrameInfo::Update(const gfx::VRDisplayInfo& aInfo,
const gfx::VRHMDSensorState& aState, float aDepthNear,
float aDepthFar) {
mVRState = aState;
if (mTimeStampOffset == 0.0f) {
/**
* A mTimeStampOffset value of 0.0f indicates that this is the first
* iteration and an offset has not yet been set.
*
* Generate a value for mTimeStampOffset such that if aState.timestamp is
* monotonically increasing, aState.timestamp + mTimeStampOffset will never
* be a negative number and will start at a pseudo-random offset
* between 1000.0f and 11000.0f seconds.
*
* We use a pseudo random offset rather than 0.0f just to discourage users
* from making the assumption that the timestamp returned in the WebVR API
* has a base of 0, which is not necessarily true in all UA's.
*/
mTimeStampOffset =
float(rand()) / float(RAND_MAX) * 10000.0f + 1000.0f - aState.timestamp;
}
mVRState.timestamp = aState.timestamp + mTimeStampOffset;
// Avoid division by zero within ConstructProjectionMatrix
const float kEpsilon = 0.00001f;
if (fabs(aDepthFar - aDepthNear) < kEpsilon) {
aDepthFar = aDepthNear + kEpsilon;
}
const gfx::VRFieldOfView leftFOV =
aInfo.mDisplayState.eyeFOV[gfx::VRDisplayState::Eye_Left];
mLeftProjection =
leftFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
const gfx::VRFieldOfView rightFOV =
aInfo.mDisplayState.eyeFOV[gfx::VRDisplayState::Eye_Right];
mRightProjection =
rightFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
memcpy(mLeftView.components, aState.leftViewMatrix.data(),
sizeof(aState.leftViewMatrix));
memcpy(mRightView.components, aState.rightViewMatrix.data(),
sizeof(aState.rightViewMatrix));
}
VRFrameInfo::VRFrameInfo() : mTimeStampOffset(0.0f) {
mVRState.inputFrameID = 0;
mVRState.timestamp = 0.0;
mVRState.flags = gfx::VRDisplayCapabilityFlags::Cap_None;
}
bool VRFrameInfo::IsDirty() { return mVRState.timestamp == 0; }
void VRFrameInfo::Clear() { mVRState.Clear(); }
} // namespace mozilla::dom
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