device/vr/openvr/openvr_device.cc - chromium/src - Git at Google

 // Copyright (c) 2017 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/openvr/openvr_device.h"

 #include <math.h>

 #include <utility>

 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/numerics/math_constants.h"
 #include "build/build_config.h"
 #include "device/vr/openvr/openvr_render_loop.h"
 #include "device/vr/openvr/openvr_type_converters.h"
 #include "third_party/openvr/src/headers/openvr.h"
 #include "ui/gfx/geometry/angle_conversions.h"

 namespace device {

 void OpenVRDevice::RecordRuntimeAvailability() {
   XrRuntimeAvailable runtime = XrRuntimeAvailable::NONE;
   if (vr::VR_IsRuntimeInstalled())
     runtime = XrRuntimeAvailable::OPENVR;
   UMA_HISTOGRAM_ENUMERATION("XR.RuntimeAvailable", runtime);
 }

 namespace {

 constexpr base::TimeDelta kPollingInterval =
     base::TimeDelta::FromSecondsD(0.25);

 mojom::VRFieldOfViewPtr OpenVRFovToWebVRFov(vr::IVRSystem* vr_system,
                                             vr::Hmd_Eye eye) {
   auto out = mojom::VRFieldOfView::New();
   float up_tan, down_tan, left_tan, right_tan;
   vr_system->GetProjectionRaw(eye, &left_tan, &right_tan, &up_tan, &down_tan);

   // TODO(billorr): Plumb the expected projection matrix over mojo instead of
   // using angles. Up and down are intentionally swapped to account for
   // differences in expected projection matrix format for GVR and OpenVR.
   out->up_degrees = gfx::RadToDeg(atanf(down_tan));
   out->down_degrees = -gfx::RadToDeg(atanf(up_tan));
   out->left_degrees = -gfx::RadToDeg(atanf(left_tan));
   out->right_degrees = gfx::RadToDeg(atanf(right_tan));
   return out;
 }

 gfx::Transform HmdMatrix34ToTransform(const vr::HmdMatrix34_t& mat) {
   // Disable formatting so that the 4x4 matrix is more readable
   // clang-format off
   return gfx::Transform(
      mat.m[0][0], mat.m[0][1], mat.m[0][2], mat.m[0][3],
      mat.m[1][0], mat.m[1][1], mat.m[1][2], mat.m[1][3],
      mat.m[2][0], mat.m[2][1], mat.m[2][2], mat.m[2][3],
      0.0f,        0.0f,        0.0f,        1.0f);
   // clang-format on
 }

 // OpenVR uses A_to_B convention for naming transformation matrices, but we pass
 // matrices through mojo using the B_from_A naming convention since that what
 // blink uses.
 gfx::Transform HeadFromEyeTransform(vr::IVRSystem* vr_system, vr::Hmd_Eye eye) {
   return HmdMatrix34ToTransform(vr_system->GetEyeToHeadTransform(eye));
 }

 mojom::VRDisplayInfoPtr CreateVRDisplayInfo(vr::IVRSystem* vr_system,
                                             device::mojom::XRDeviceId id) {
   mojom::VRDisplayInfoPtr display_info = mojom::VRDisplayInfo::New();
   display_info->id = id;
   display_info->display_name =
       GetOpenVRString(vr_system, vr::Prop_ManufacturerName_String) + " " +
       GetOpenVRString(vr_system, vr::Prop_ModelNumber_String);
   display_info->capabilities = mojom::VRDisplayCapabilities::New();
   display_info->capabilities->has_position = true;
   display_info->capabilities->has_external_display = true;
   display_info->capabilities->can_present = true;
   display_info->webvr_default_framebuffer_scale = 1.0;
   display_info->webxr_default_framebuffer_scale = 1.0;

   display_info->left_eye = mojom::VREyeParameters::New();
   display_info->right_eye = mojom::VREyeParameters::New();
   mojom::VREyeParametersPtr& left_eye = display_info->left_eye;
   mojom::VREyeParametersPtr& right_eye = display_info->right_eye;

   left_eye->field_of_view = OpenVRFovToWebVRFov(vr_system, vr::Eye_Left);
   right_eye->field_of_view = OpenVRFovToWebVRFov(vr_system, vr::Eye_Right);

   left_eye->head_from_eye = HeadFromEyeTransform(vr_system, vr::Eye_Left);
   right_eye->head_from_eye = HeadFromEyeTransform(vr_system, vr::Eye_Right);

   uint32_t width, height;
   vr_system->GetRecommendedRenderTargetSize(&width, &height);
   left_eye->render_width = width;
   left_eye->render_height = height;
   right_eye->render_width = left_eye->render_width;
   right_eye->render_height = left_eye->render_height;

   display_info->stage_parameters = mojom::VRStageParameters::New();
   vr::HmdMatrix34_t mat =
       vr_system->GetSeatedZeroPoseToStandingAbsoluteTrackingPose();
   display_info->stage_parameters->standing_transform =
       HmdMatrix34ToTransform(mat);

   vr::IVRChaperone* chaperone = vr::VRChaperone();
   if (chaperone) {
     chaperone->GetPlayAreaSize(&display_info->stage_parameters->size_x,
                                &display_info->stage_parameters->size_z);
   } else {
     display_info->stage_parameters->size_x = 0.0f;
     display_info->stage_parameters->size_z = 0.0f;
   }

   return display_info;
 }


 }  // namespace

 OpenVRDevice::OpenVRDevice()
     : VRDeviceBase(device::mojom::XRDeviceId::OPENVR_DEVICE_ID),
       main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       exclusive_controller_binding_(this),
       gamepad_provider_factory_binding_(this),
       compositor_host_binding_(this) {
   render_loop_ = std::make_unique<OpenVRRenderLoop>();

   OnPollingEvents();
 }

 bool OpenVRDevice::IsHwAvailable() {
   return vr::VR_IsHmdPresent();
 }

 bool OpenVRDevice::IsApiAvailable() {
   return vr::VR_IsRuntimeInstalled();
 }

 mojom::IsolatedXRGamepadProviderFactoryPtr OpenVRDevice::BindGamepadFactory() {
   mojom::IsolatedXRGamepadProviderFactoryPtr ret;
   gamepad_provider_factory_binding_.Bind(mojo::MakeRequest(&ret));
   return ret;
 }

 mojom::XRCompositorHostPtr OpenVRDevice::BindCompositorHost() {
   mojom::XRCompositorHostPtr ret;
   compositor_host_binding_.Bind(mojo::MakeRequest(&ret));
   return ret;
 }

 OpenVRDevice::~OpenVRDevice() {
   Shutdown();
 }

 void OpenVRDevice::Shutdown() {
   // Wait for the render loop to stop before completing destruction. This will
   // ensure that the IVRSystem doesn't get shutdown until the render loop is no
   // longer referencing it.
   if (render_loop_ && render_loop_->IsRunning())
     render_loop_->Stop();
 }

 void OpenVRDevice::RequestSession(
     mojom::XRRuntimeSessionOptionsPtr options,
     mojom::XRRuntime::RequestSessionCallback callback) {
   if (!EnsureValidDisplayInfo()) {
     std::move(callback).Run(nullptr, nullptr);
     return;
   }

   DCHECK(options->immersive);

   if (!render_loop_->IsRunning()) {
     render_loop_->Start();

     if (!render_loop_->IsRunning()) {
       std::move(callback).Run(nullptr, nullptr);
       return;
     }

     if (provider_request_) {
       render_loop_->task_runner()->PostTask(
           FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestGamepadProvider,
                                     base::Unretained(render_loop_.get()),
                                     std::move(provider_request_)));
     }

     if (overlay_request_) {
       render_loop_->task_runner()->PostTask(
           FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestOverlay,
                                     base::Unretained(render_loop_.get()),
                                     std::move(overlay_request_)));
     }
   }

   // We are done using OpenVR until the presentation session ends.
   openvr_ = nullptr;

   auto my_callback =
       base::BindOnce(&OpenVRDevice::OnRequestSessionResult,
                      weak_ptr_factory_.GetWeakPtr(), std::move(callback));

   auto on_presentation_ended = base::BindOnce(
       &OpenVRDevice::OnPresentationEnded, weak_ptr_factory_.GetWeakPtr());

   render_loop_->task_runner()->PostTask(
       FROM_HERE,
       base::BindOnce(&XRCompositorCommon::RequestSession,
                      base::Unretained(render_loop_.get()),
                      std::move(on_presentation_ended),
                      base::DoNothing::Repeatedly<mojom::XRVisibilityState>(),
                      std::move(options), std::move(my_callback)));
   outstanding_session_requests_count_++;
 }

 void OpenVRDevice::EnsureInitialized(EnsureInitializedCallback callback) {
   EnsureValidDisplayInfo();
   std::move(callback).Run();
 }

 bool OpenVRDevice::EnsureValidDisplayInfo() {
   // Ensure we have had a valid display_info set at least once.
   if (!have_real_display_info_) {
     DCHECK(!openvr_);
     // Initialize OpenVR.
     openvr_ = std::make_unique<OpenVRWrapper>(false /* presenting */);
     if (!openvr_->IsInitialized()) {
       openvr_ = nullptr;
       return false;
     }

     SetVRDisplayInfo(CreateVRDisplayInfo(openvr_->GetSystem(), GetId()));
     have_real_display_info_ = true;
   }
   return have_real_display_info_;
 }

 void OpenVRDevice::OnPresentationEnded() {
   if (!openvr_ && outstanding_session_requests_count_ == 0) {
     openvr_ = std::make_unique<OpenVRWrapper>(false /* presenting */);
     if (!openvr_->IsInitialized()) {
       openvr_ = nullptr;
       return;
     }
   }
 }

 void OpenVRDevice::OnRequestSessionResult(
     mojom::XRRuntime::RequestSessionCallback callback,
     bool result,
     mojom::XRSessionPtr session) {
   outstanding_session_requests_count_--;
   if (!result) {
     OnPresentationEnded();
     std::move(callback).Run(nullptr, nullptr);
     return;
   }

   OnStartPresenting();

   mojom::XRSessionControllerPtr session_controller;
   exclusive_controller_binding_.Bind(mojo::MakeRequest(&session_controller));

   // Use of Unretained is safe because the callback will only occur if the
   // binding is not destroyed.
   exclusive_controller_binding_.set_connection_error_handler(
       base::BindOnce(&OpenVRDevice::OnPresentingControllerMojoConnectionError,
                      base::Unretained(this)));

   session->display_info = display_info_.Clone();

   std::move(callback).Run(std::move(session), std::move(session_controller));
 }

 bool OpenVRDevice::IsAvailable() {
   return vr::VR_IsRuntimeInstalled() && vr::VR_IsHmdPresent();
 }

 void OpenVRDevice::GetIsolatedXRGamepadProvider(
     mojom::IsolatedXRGamepadProviderRequest provider_request) {
   if (render_loop_->IsRunning()) {
     render_loop_->task_runner()->PostTask(
         FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestGamepadProvider,
                                   base::Unretained(render_loop_.get()),
                                   std::move(provider_request)));
   } else {
     provider_request_ = std::move(provider_request);
   }
 }

 void OpenVRDevice::CreateImmersiveOverlay(
     mojom::ImmersiveOverlayRequest overlay_request) {
   if (render_loop_->IsRunning()) {
     render_loop_->task_runner()->PostTask(
         FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestOverlay,
                                   base::Unretained(render_loop_.get()),
                                   std::move(overlay_request)));
   } else {
     overlay_request_ = std::move(overlay_request);
   }
 }

 // XRSessionController
 void OpenVRDevice::SetFrameDataRestricted(bool restricted) {
   // Presentation sessions can not currently be restricted.
   DCHECK(false);
 }

 void OpenVRDevice::OnPresentingControllerMojoConnectionError() {
   render_loop_->task_runner()->PostTask(
       FROM_HERE, base::BindOnce(&XRCompositorCommon::ExitPresent,
                                 base::Unretained(render_loop_.get())));
   // Don't stop the render loop here. We need to keep the gamepad provider alive
   // so that we don't lose a pending mojo gamepad_callback_.
   // TODO(https://crbug.com/875187): Alternatively, we could recreate the
   // provider on the next session, or look into why the callback gets lost.
   OnExitPresent();
   exclusive_controller_binding_.Close();
 }

 // Only deal with events that will cause displayInfo changes for now.
 void OpenVRDevice::OnPollingEvents() {
   main_thread_task_runner_->PostDelayedTask(
       FROM_HERE,
       base::BindOnce(&OpenVRDevice::OnPollingEvents,
                      weak_ptr_factory_.GetWeakPtr()),
       kPollingInterval);

   if (!openvr_)
     return;

   vr::VREvent_t event;
   bool is_changed = false;
   while (openvr_->GetSystem()->PollNextEvent(&event, sizeof(event))) {
     if (event.trackedDeviceIndex != vr::k_unTrackedDeviceIndex_Hmd &&
         event.trackedDeviceIndex != vr::k_unTrackedDeviceIndexInvalid) {
       continue;
     }

     switch (event.eventType) {
       case vr::VREvent_TrackedDeviceUpdated:
       case vr::VREvent_IpdChanged:
       case vr::VREvent_ChaperoneDataHasChanged:
       case vr::VREvent_ChaperoneSettingsHaveChanged:
       case vr::VREvent_ChaperoneUniverseHasChanged:
         is_changed = true;
         break;

       default:
         break;
     }
   }

   if (is_changed)
     SetVRDisplayInfo(CreateVRDisplayInfo(openvr_->GetSystem(), GetId()));
 }

 }  // namespace device
	// Copyright (c) 2017 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/openvr/openvr_device.h"

	#include <math.h>

	#include <utility>

	#include "base/bind.h"
	#include "base/macros.h"
	#include "base/memory/ptr_util.h"
	#include "base/metrics/histogram_macros.h"
	#include "base/numerics/math_constants.h"
	#include "build/build_config.h"
	#include "device/vr/openvr/openvr_render_loop.h"
	#include "device/vr/openvr/openvr_type_converters.h"
	#include "third_party/openvr/src/headers/openvr.h"
	#include "ui/gfx/geometry/angle_conversions.h"

	namespace device {

	void OpenVRDevice::RecordRuntimeAvailability() {
	XrRuntimeAvailable runtime = XrRuntimeAvailable::NONE;
	if (vr::VR_IsRuntimeInstalled())
	runtime = XrRuntimeAvailable::OPENVR;
	UMA_HISTOGRAM_ENUMERATION("XR.RuntimeAvailable", runtime);
	}

	namespace {

	constexpr base::TimeDelta kPollingInterval =
	base::TimeDelta::FromSecondsD(0.25);

	mojom::VRFieldOfViewPtr OpenVRFovToWebVRFov(vr::IVRSystem* vr_system,
	vr::Hmd_Eye eye) {
	auto out = mojom::VRFieldOfView::New();
	float up_tan, down_tan, left_tan, right_tan;
	vr_system->GetProjectionRaw(eye, &left_tan, &right_tan, &up_tan, &down_tan);

	// TODO(billorr): Plumb the expected projection matrix over mojo instead of
	// using angles. Up and down are intentionally swapped to account for
	// differences in expected projection matrix format for GVR and OpenVR.
	out->up_degrees = gfx::RadToDeg(atanf(down_tan));
	out->down_degrees = -gfx::RadToDeg(atanf(up_tan));
	out->left_degrees = -gfx::RadToDeg(atanf(left_tan));
	out->right_degrees = gfx::RadToDeg(atanf(right_tan));
	return out;
	}

	gfx::Transform HmdMatrix34ToTransform(const vr::HmdMatrix34_t& mat) {
	// Disable formatting so that the 4x4 matrix is more readable
	// clang-format off
	return gfx::Transform(
	mat.m[0][0], mat.m[0][1], mat.m[0][2], mat.m[0][3],
	mat.m[1][0], mat.m[1][1], mat.m[1][2], mat.m[1][3],
	mat.m[2][0], mat.m[2][1], mat.m[2][2], mat.m[2][3],
	0.0f, 0.0f, 0.0f, 1.0f);
	// clang-format on
	}

	// OpenVR uses A_to_B convention for naming transformation matrices, but we pass
	// matrices through mojo using the B_from_A naming convention since that what
	// blink uses.
	gfx::Transform HeadFromEyeTransform(vr::IVRSystem* vr_system, vr::Hmd_Eye eye) {
	return HmdMatrix34ToTransform(vr_system->GetEyeToHeadTransform(eye));
	}

	mojom::VRDisplayInfoPtr CreateVRDisplayInfo(vr::IVRSystem* vr_system,
	device::mojom::XRDeviceId id) {
	mojom::VRDisplayInfoPtr display_info = mojom::VRDisplayInfo::New();
	display_info->id = id;
	display_info->display_name =
	GetOpenVRString(vr_system, vr::Prop_ManufacturerName_String) + " " +
	GetOpenVRString(vr_system, vr::Prop_ModelNumber_String);
	display_info->capabilities = mojom::VRDisplayCapabilities::New();
	display_info->capabilities->has_position = true;
	display_info->capabilities->has_external_display = true;
	display_info->capabilities->can_present = true;
	display_info->webvr_default_framebuffer_scale = 1.0;
	display_info->webxr_default_framebuffer_scale = 1.0;

	display_info->left_eye = mojom::VREyeParameters::New();
	display_info->right_eye = mojom::VREyeParameters::New();
	mojom::VREyeParametersPtr& left_eye = display_info->left_eye;
	mojom::VREyeParametersPtr& right_eye = display_info->right_eye;

	left_eye->field_of_view = OpenVRFovToWebVRFov(vr_system, vr::Eye_Left);
	right_eye->field_of_view = OpenVRFovToWebVRFov(vr_system, vr::Eye_Right);

	left_eye->head_from_eye = HeadFromEyeTransform(vr_system, vr::Eye_Left);
	right_eye->head_from_eye = HeadFromEyeTransform(vr_system, vr::Eye_Right);

	uint32_t width, height;
	vr_system->GetRecommendedRenderTargetSize(&width, &height);
	left_eye->render_width = width;
	left_eye->render_height = height;
	right_eye->render_width = left_eye->render_width;
	right_eye->render_height = left_eye->render_height;

	display_info->stage_parameters = mojom::VRStageParameters::New();
	vr::HmdMatrix34_t mat =
	vr_system->GetSeatedZeroPoseToStandingAbsoluteTrackingPose();
	display_info->stage_parameters->standing_transform =
	HmdMatrix34ToTransform(mat);

	vr::IVRChaperone* chaperone = vr::VRChaperone();
	if (chaperone) {
	chaperone->GetPlayAreaSize(&display_info->stage_parameters->size_x,
	&display_info->stage_parameters->size_z);
	} else {
	display_info->stage_parameters->size_x = 0.0f;
	display_info->stage_parameters->size_z = 0.0f;
	}

	return display_info;
	}


	} // namespace

	OpenVRDevice::OpenVRDevice()
	: VRDeviceBase(device::mojom::XRDeviceId::OPENVR_DEVICE_ID),
	main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
	exclusive_controller_binding_(this),
	gamepad_provider_factory_binding_(this),
	compositor_host_binding_(this) {
	render_loop_ = std::make_unique<OpenVRRenderLoop>();

	OnPollingEvents();
	}

	bool OpenVRDevice::IsHwAvailable() {
	return vr::VR_IsHmdPresent();
	}

	bool OpenVRDevice::IsApiAvailable() {
	return vr::VR_IsRuntimeInstalled();
	}

	mojom::IsolatedXRGamepadProviderFactoryPtr OpenVRDevice::BindGamepadFactory() {
	mojom::IsolatedXRGamepadProviderFactoryPtr ret;
	gamepad_provider_factory_binding_.Bind(mojo::MakeRequest(&ret));
	return ret;
	}

	mojom::XRCompositorHostPtr OpenVRDevice::BindCompositorHost() {
	mojom::XRCompositorHostPtr ret;
	compositor_host_binding_.Bind(mojo::MakeRequest(&ret));
	return ret;
	}

	OpenVRDevice::~OpenVRDevice() {
	Shutdown();
	}

	void OpenVRDevice::Shutdown() {
	// Wait for the render loop to stop before completing destruction. This will
	// ensure that the IVRSystem doesn't get shutdown until the render loop is no
	// longer referencing it.
	if (render_loop_ && render_loop_->IsRunning())
	render_loop_->Stop();
	}

	void OpenVRDevice::RequestSession(
	mojom::XRRuntimeSessionOptionsPtr options,
	mojom::XRRuntime::RequestSessionCallback callback) {
	if (!EnsureValidDisplayInfo()) {
	std::move(callback).Run(nullptr, nullptr);
	return;
	}

	DCHECK(options->immersive);

	if (!render_loop_->IsRunning()) {
	render_loop_->Start();

	if (!render_loop_->IsRunning()) {
	std::move(callback).Run(nullptr, nullptr);
	return;
	}

	if (provider_request_) {
	render_loop_->task_runner()->PostTask(
	FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestGamepadProvider,
	base::Unretained(render_loop_.get()),
	std::move(provider_request_)));
	}

	if (overlay_request_) {
	render_loop_->task_runner()->PostTask(
	FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestOverlay,
	base::Unretained(render_loop_.get()),
	std::move(overlay_request_)));
	}
	}

	// We are done using OpenVR until the presentation session ends.
	openvr_ = nullptr;

	auto my_callback =
	base::BindOnce(&OpenVRDevice::OnRequestSessionResult,
	weak_ptr_factory_.GetWeakPtr(), std::move(callback));

	auto on_presentation_ended = base::BindOnce(
	&OpenVRDevice::OnPresentationEnded, weak_ptr_factory_.GetWeakPtr());

	render_loop_->task_runner()->PostTask(
	FROM_HERE,
	base::BindOnce(&XRCompositorCommon::RequestSession,
	base::Unretained(render_loop_.get()),
	std::move(on_presentation_ended),
	base::DoNothing::Repeatedly<mojom::XRVisibilityState>(),
	std::move(options), std::move(my_callback)));
	outstanding_session_requests_count_++;
	}

	void OpenVRDevice::EnsureInitialized(EnsureInitializedCallback callback) {
	EnsureValidDisplayInfo();
	std::move(callback).Run();
	}

	bool OpenVRDevice::EnsureValidDisplayInfo() {
	// Ensure we have had a valid display_info set at least once.
	if (!have_real_display_info_) {
	DCHECK(!openvr_);
	// Initialize OpenVR.
	openvr_ = std::make_unique<OpenVRWrapper>(false /* presenting */);
	if (!openvr_->IsInitialized()) {
	openvr_ = nullptr;
	return false;
	}

	SetVRDisplayInfo(CreateVRDisplayInfo(openvr_->GetSystem(), GetId()));
	have_real_display_info_ = true;
	}
	return have_real_display_info_;
	}

	void OpenVRDevice::OnPresentationEnded() {
	if (!openvr_ && outstanding_session_requests_count_ == 0) {
	openvr_ = std::make_unique<OpenVRWrapper>(false /* presenting */);
	if (!openvr_->IsInitialized()) {
	openvr_ = nullptr;
	return;
	}
	}
	}

	void OpenVRDevice::OnRequestSessionResult(
	mojom::XRRuntime::RequestSessionCallback callback,
	bool result,
	mojom::XRSessionPtr session) {
	outstanding_session_requests_count_--;
	if (!result) {
	OnPresentationEnded();
	std::move(callback).Run(nullptr, nullptr);
	return;
	}

	OnStartPresenting();

	mojom::XRSessionControllerPtr session_controller;
	exclusive_controller_binding_.Bind(mojo::MakeRequest(&session_controller));

	// Use of Unretained is safe because the callback will only occur if the
	// binding is not destroyed.
	exclusive_controller_binding_.set_connection_error_handler(
	base::BindOnce(&OpenVRDevice::OnPresentingControllerMojoConnectionError,
	base::Unretained(this)));

	session->display_info = display_info_.Clone();

	std::move(callback).Run(std::move(session), std::move(session_controller));
	}

	bool OpenVRDevice::IsAvailable() {
	return vr::VR_IsRuntimeInstalled() && vr::VR_IsHmdPresent();
	}

	void OpenVRDevice::GetIsolatedXRGamepadProvider(
	mojom::IsolatedXRGamepadProviderRequest provider_request) {
	if (render_loop_->IsRunning()) {
	render_loop_->task_runner()->PostTask(
	FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestGamepadProvider,
	base::Unretained(render_loop_.get()),
	std::move(provider_request)));
	} else {
	provider_request_ = std::move(provider_request);
	}
	}

	void OpenVRDevice::CreateImmersiveOverlay(
	mojom::ImmersiveOverlayRequest overlay_request) {
	if (render_loop_->IsRunning()) {
	render_loop_->task_runner()->PostTask(
	FROM_HERE, base::BindOnce(&XRCompositorCommon::RequestOverlay,
	base::Unretained(render_loop_.get()),
	std::move(overlay_request)));
	} else {
	overlay_request_ = std::move(overlay_request);
	}
	}

	// XRSessionController
	void OpenVRDevice::SetFrameDataRestricted(bool restricted) {
	// Presentation sessions can not currently be restricted.
	DCHECK(false);
	}

	void OpenVRDevice::OnPresentingControllerMojoConnectionError() {
	render_loop_->task_runner()->PostTask(
	FROM_HERE, base::BindOnce(&XRCompositorCommon::ExitPresent,
	base::Unretained(render_loop_.get())));
	// Don't stop the render loop here. We need to keep the gamepad provider alive
	// so that we don't lose a pending mojo gamepad_callback_.
	// TODO(https://crbug.com/875187): Alternatively, we could recreate the
	// provider on the next session, or look into why the callback gets lost.
	OnExitPresent();
	exclusive_controller_binding_.Close();
	}

	// Only deal with events that will cause displayInfo changes for now.
	void OpenVRDevice::OnPollingEvents() {
	main_thread_task_runner_->PostDelayedTask(
	FROM_HERE,
	base::BindOnce(&OpenVRDevice::OnPollingEvents,
	weak_ptr_factory_.GetWeakPtr()),
	kPollingInterval);

	if (!openvr_)
	return;

	vr::VREvent_t event;
	bool is_changed = false;
	while (openvr_->GetSystem()->PollNextEvent(&event, sizeof(event))) {
	if (event.trackedDeviceIndex != vr::k_unTrackedDeviceIndex_Hmd &&
	event.trackedDeviceIndex != vr::k_unTrackedDeviceIndexInvalid) {
	continue;
	}

	switch (event.eventType) {
	case vr::VREvent_TrackedDeviceUpdated:
	case vr::VREvent_IpdChanged:
	case vr::VREvent_ChaperoneDataHasChanged:
	case vr::VREvent_ChaperoneSettingsHaveChanged:
	case vr::VREvent_ChaperoneUniverseHasChanged:
	is_changed = true;
	break;

	default:
	break;
	}
	}

	if (is_changed)
	SetVRDisplayInfo(CreateVRDisplayInfo(openvr_->GetSystem(), GetId()));
	}

	} // namespace device