Hololens port

2025-08-03 12:40:06 +01:00 · 2019-06-22 00:05:35 +02:00 · 2019-06-22 00:05:35 +02:00 · acde7e04cb
commit acde7e04cb
parent 5beac079f6
27 changed files with 1501 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -44,3 +44,42 @@ capture_webrender/
 /unminified-js
 # Hololens artifacts
 support/hololens/x64/
 support/hololens/ARM/
 support/hololens/Generated\ Files
 # Ignore thumbnails created by Windows
 support/hololens/Thumbs.db
 # Ignore files built by Visual Studio
 support/hololens/*.obj
 support/hololens/*.exe
 support/hololens/*.pdb
 support/hololens/*.user
 support/hololens/*.aps
 support/hololens/*.pch
 support/hololens/*.vspscc
 support/hololens/*_i.c
 support/hololens/*_p.c
 support/hololens/*.ncb
 support/hololens/*.suo
 support/hololens/*.tlb
 support/hololens/*.tlh
 support/hololens/*.bak
 support/hololens/*.cache
 support/hololens/*.ilk
 support/hololens/*.log
 support/hololens/[Bb]in
 support/hololens/[Dd]ebug*/
 support/hololens/*.lib
 support/hololens/*.sbr
 support/hololens/obj/
 support/hololens/[Rr]elease*/
 support/hololens/_ReSharper*/
 support/hololens/[Tt]est[Rr]esult*
 support/hololens/.vs/
 # Nuget packages folder
 support/hololens/packages/
--- a/support/hololens/App.xaml
+++ b/support/hololens/App.xaml
@ -0,0 +1,7 @@
 <Application
    x:Class="hlservo.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:hlservo">
 </Application>
--- a/support/hololens/App.xaml.cpp
+++ b/support/hololens/App.xaml.cpp
@ -0,0 +1,29 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #include "pch.h"
 #include "App.xaml.h"
 using namespace hlservo;
 App::App()
 {
    InitializeComponent();
 }
 void App::OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs ^ e)
 {
 #if _DEBUG
    if (IsDebuggerPresent()) {
        DebugSettings->EnableFrameRateCounter = true;
    }
 #endif
    if (mPage == nullptr) {
        mPage = ref new OpenGLESPage(&mOpenGLES);
    }
    Windows::UI::Xaml::Window::Current->Content = mPage;
    Windows::UI::Xaml::Window::Current->Activate();
 }
--- a/support/hololens/App.xaml.h
+++ b/support/hololens/App.xaml.h
@ -0,0 +1,21 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #pragma once
 #include "OpenGLES.h"
 #include "app.g.h"
 #include "openglespage.xaml.h"
 namespace hlservo {
 ref class App sealed {
 public:
    App();
    virtual void OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs ^ e) override;
 private:
    OpenGLESPage ^ mPage;
    OpenGLES mOpenGLES;
 };
 }
--- a/support/hololens/Assets/LockScreenLogo.scale-200.png
+++ b/support/hololens/Assets/LockScreenLogo.scale-200.png
--- a/support/hololens/Assets/SplashScreen.scale-200.png
+++ b/support/hololens/Assets/SplashScreen.scale-200.png
--- a/support/hololens/Assets/Square150x150Logo.scale-200.png
+++ b/support/hololens/Assets/Square150x150Logo.scale-200.png
--- a/support/hololens/Assets/Square44x44Logo.scale-200.png
+++ b/support/hololens/Assets/Square44x44Logo.scale-200.png
--- a/support/hololens/Assets/Square44x44Logo.targetsize-24_altform-unplated.png
+++ b/support/hololens/Assets/Square44x44Logo.targetsize-24_altform-unplated.png
--- a/support/hololens/Assets/StoreLogo.png
+++ b/support/hololens/Assets/StoreLogo.png
--- a/support/hololens/Assets/Wide310x150Logo.scale-200.png
+++ b/support/hololens/Assets/Wide310x150Logo.scale-200.png
--- a/support/hololens/OpenGLES.cpp
+++ b/support/hololens/OpenGLES.cpp
@ -0,0 +1,232 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #include "pch.h"
 #include "OpenGLES.h"
 using namespace Platform;
 using namespace Windows::UI::Xaml::Controls;
 using namespace Windows::Foundation;
 using namespace Windows::Foundation::Collections;
 OpenGLES::OpenGLES()
    : mEglConfig(nullptr)
    , mEglDisplay(EGL_NO_DISPLAY)
    , mEglContext(EGL_NO_CONTEXT)
 {
    Initialize();
 }
 OpenGLES::~OpenGLES()
 {
    Cleanup();
 }
 void OpenGLES::Initialize()
 {
    const EGLint configAttributes[] = {
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_RED_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_BLUE_SIZE, 8,
        EGL_ALPHA_SIZE, 8,
        EGL_DEPTH_SIZE, 24,
        EGL_STENCIL_SIZE, 8,
        EGL_NONE
    };
    const EGLint contextAttributes[] = {
        EGL_CONTEXT_CLIENT_VERSION, 3,
        EGL_NONE
    };
    // Based on Angle MS template.
    const EGLint defaultDisplayAttributes[] = {
        // These are the default display attributes, used to request ANGLE's D3D11 renderer.
        // eglInitialize will only succeed with these attributes if the hardware supports D3D11 Feature Level 10_0+.
        EGL_PLATFORM_ANGLE_TYPE_ANGLE,
        EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
        // EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER is an optimization that can have large performance benefits on
        // mobile devices. Its syntax is subject to change, though. Please update your Visual Studio templates if you
        // experience compilation issues with it.
        EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER,
        EGL_TRUE,
        // EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE is an option that enables ANGLE to automatically call
        // the IDXGIDevice3::Trim method on behalf of the application when it gets suspended.
        // Calling IDXGIDevice3::Trim when an application is suspended is a Windows Store application certification
        // requirement.
        EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE,
        EGL_TRUE,
        EGL_NONE,
    };
    const EGLint fl9_3DisplayAttributes[] = {
        // These can be used to request ANGLE's D3D11 renderer, with D3D11 Feature Level 9_3.
        // These attributes are used if the call to eglInitialize fails with the default display attributes.
        EGL_PLATFORM_ANGLE_TYPE_ANGLE,
        EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
        EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE,
        9,
        EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE,
        3,
        EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER,
        EGL_TRUE,
        EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE,
        EGL_TRUE,
        EGL_NONE,
    };
    const EGLint warpDisplayAttributes[] = {
        // These attributes can be used to request D3D11 WARP.
        // They are used if eglInitialize fails with both the default display attributes and the 9_3 display attributes.
        EGL_PLATFORM_ANGLE_TYPE_ANGLE,
        EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE,
        EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE,
        EGL_PLATFORM_ANGLE_DEVICE_TYPE_WARP_ANGLE,
        EGL_ANGLE_DISPLAY_ALLOW_RENDER_TO_BACK_BUFFER,
        EGL_TRUE,
        EGL_PLATFORM_ANGLE_ENABLE_AUTOMATIC_TRIM_ANGLE,
        EGL_TRUE,
        EGL_NONE,
    };
    EGLConfig config = NULL;
    // eglGetPlatformDisplayEXT is an alternative to eglGetDisplay.
    // It allows us to pass in display attributes, used to configure D3D11.
    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT =
      reinterpret_cast<PFNEGLGETPLATFORMDISPLAYEXTPROC>(eglGetProcAddress("eglGetPlatformDisplayEXT"));
    if (!eglGetPlatformDisplayEXT) {
        throw Exception::CreateException(E_FAIL, L"Failed to get function eglGetPlatformDisplayEXT");
    }
    //
    // To initialize the display, we make three sets of calls to eglGetPlatformDisplayEXT and eglInitialize,
    // with varying parameters passed to eglGetPlatformDisplayEXT:
    // 1) The first calls uses "defaultDisplayAttributes" as a parameter. This corresponds to D3D11 Feature Level 10_0+.
    // 2) If eglInitialize fails for step 1 (e.g. because 10_0+ isn't supported by the default GPU), then we try again
    //    using "fl9_3DisplayAttributes". This corresponds to D3D11 Feature Level 9_3.
    // 3) If eglInitialize fails for step 2 (e.g. because 9_3+ isn't supported by the default GPU), then we try again
    //    using "warpDisplayAttributes".  This corresponds to D3D11 Feature Level 11_0 on WARP, a D3D11 software
    //    rasterizer.
    //
    // This tries to initialize EGL to D3D11 Feature Level 10_0+. See above comment for details.
    mEglDisplay = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY, defaultDisplayAttributes);
    if (mEglDisplay == EGL_NO_DISPLAY) {
        throw Exception::CreateException(E_FAIL, L"Failed to get EGL display");
    }
    if (eglInitialize(mEglDisplay, NULL, NULL) == EGL_FALSE) {
        // This tries to initialize EGL to D3D11 Feature Level 9_3, if 10_0+ is unavailable (e.g. on some mobile
        // devices).
        mEglDisplay = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY, fl9_3DisplayAttributes);
        if (mEglDisplay == EGL_NO_DISPLAY) {
            throw Exception::CreateException(E_FAIL, L"Failed to get EGL display");
        }
        if (eglInitialize(mEglDisplay, NULL, NULL) == EGL_FALSE) {
            // This initializes EGL to D3D11 Feature Level 11_0 on WARP, if 9_3+ is unavailable on the default GPU.
            mEglDisplay = eglGetPlatformDisplayEXT(EGL_PLATFORM_ANGLE_ANGLE, EGL_DEFAULT_DISPLAY,
                warpDisplayAttributes);
            if (mEglDisplay == EGL_NO_DISPLAY) {
                throw Exception::CreateException(E_FAIL, L"Failed to get EGL display");
            }
            if (eglInitialize(mEglDisplay, NULL, NULL) == EGL_FALSE) {
                // If all of the calls to eglInitialize returned EGL_FALSE then an error has occurred.
                throw Exception::CreateException(E_FAIL, L"Failed to initialize EGL");
            }
        }
    }
    EGLint numConfigs = 0;
    if ((eglChooseConfig(mEglDisplay, configAttributes, &mEglConfig, 1, &numConfigs) == EGL_FALSE) ||
        (numConfigs == 0)) {
        throw Exception::CreateException(E_FAIL, L"Failed to choose first EGLConfig");
    }
    mEglContext = eglCreateContext(mEglDisplay, mEglConfig, EGL_NO_CONTEXT, contextAttributes);
    if (mEglContext == EGL_NO_CONTEXT) {
        throw Exception::CreateException(E_FAIL, L"Failed to create EGL context");
    }
 }
 void OpenGLES::Cleanup()
 {
    if (mEglDisplay != EGL_NO_DISPLAY && mEglContext != EGL_NO_CONTEXT) {
        eglDestroyContext(mEglDisplay, mEglContext);
        mEglContext = EGL_NO_CONTEXT;
    }
    if (mEglDisplay != EGL_NO_DISPLAY) {
        eglTerminate(mEglDisplay);
        mEglDisplay = EGL_NO_DISPLAY;
    }
 }
 void OpenGLES::Reset()
 {
    Cleanup();
    Initialize();
 }
 EGLSurface OpenGLES::CreateSurface(SwapChainPanel ^ panel)
 {
    if (!panel) {
        throw Exception::CreateException(E_INVALIDARG, L"SwapChainPanel parameter is invalid");
    }
    EGLSurface surface = EGL_NO_SURFACE;
    const EGLint surfaceAttributes[] = {
        EGL_ANGLE_SURFACE_RENDER_TO_BACK_BUFFER, EGL_TRUE,
        EGL_NONE
    };
    PropertySet ^ surfaceCreationProperties = ref new PropertySet();
    surfaceCreationProperties->Insert(ref new String(EGLNativeWindowTypeProperty), panel);
    // How to set size and or scale:
    // surfaceCreationProperties->Insert(ref new String(EGLRenderSurfaceSizeProperty),
    //  PropertyValue::CreateSize(*renderSurfaceSize));
    // surfaceCreationProperties->Insert(ref new String(EGLRenderResolutionScaleProperty),
    //  PropertyValue::CreateSingle(*resolutionScale));
    surface = eglCreateWindowSurface(mEglDisplay, mEglConfig,
        reinterpret_cast<IInspectable*>(surfaceCreationProperties), surfaceAttributes);
    if (surface == EGL_NO_SURFACE) {
        throw Exception::CreateException(E_FAIL, L"Failed to create EGL surface");
    }
    return surface;
 }
 void OpenGLES::GetSurfaceDimensions(const EGLSurface surface, EGLint* width, EGLint* height)
 {
    eglQuerySurface(mEglDisplay, surface, EGL_WIDTH, width);
    eglQuerySurface(mEglDisplay, surface, EGL_HEIGHT, height);
 }
 void OpenGLES::DestroySurface(const EGLSurface surface)
 {
    if (mEglDisplay != EGL_NO_DISPLAY && surface != EGL_NO_SURFACE) {
        eglDestroySurface(mEglDisplay, surface);
    }
 }
 void OpenGLES::MakeCurrent(const EGLSurface surface)
 {
    if (eglMakeCurrent(mEglDisplay, surface, surface, mEglContext) == EGL_FALSE) {
        throw Exception::CreateException(E_FAIL, L"Failed to make EGLSurface current");
    }
 }
 EGLBoolean OpenGLES::SwapBuffers(const EGLSurface surface)
 {
    return (eglSwapBuffers(mEglDisplay, surface));
 }
--- a/support/hololens/OpenGLES.h
+++ b/support/hololens/OpenGLES.h
@ -0,0 +1,27 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #pragma once
 class OpenGLES {
 public:
    OpenGLES();
    ~OpenGLES();
    EGLSurface CreateSurface(Windows::UI::Xaml::Controls::SwapChainPanel ^ panel);
    void GetSurfaceDimensions(const EGLSurface surface, EGLint* width, EGLint* height);
    void DestroySurface(const EGLSurface surface);
    void MakeCurrent(const EGLSurface surface);
    EGLBoolean SwapBuffers(const EGLSurface surface);
    void Reset();
 private:
    void Initialize();
    void Cleanup();
 private:
    EGLDisplay mEglDisplay;
    EGLContext mEglContext;
    EGLConfig mEglConfig;
 };
--- a/support/hololens/OpenGLESPage.xaml
+++ b/support/hololens/OpenGLESPage.xaml
@ -0,0 +1,13 @@
 <Page
    x:Class="hlservo.OpenGLESPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:hlservo"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
  <SwapChainPanel x:Name="swapChainPanel">
    <TextBlock Text="OpenGL ES and XAML" Foreground="White" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" />
  </SwapChainPanel>
 </Page>
--- a/support/hololens/OpenGLESPage.xaml.cpp
+++ b/support/hololens/OpenGLESPage.xaml.cpp
@ -0,0 +1,154 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #include "pch.h"
 #include "OpenGLESPage.xaml.h"
 #include "Servo.h"
 using namespace hlservo;
 using namespace Platform;
 using namespace Concurrency;
 using namespace Windows::Foundation;
 static char sWakeupEvent[] = "SIGNAL_WAKEUP";
 OpenGLESPage::OpenGLESPage()
    : OpenGLESPage(nullptr)
 {
 }
 OpenGLESPage::OpenGLESPage(OpenGLES* openGLES)
    : mOpenGLES(openGLES)
    , mRenderSurface(EGL_NO_SURFACE)
 {
    InitializeComponent();
    Windows::UI::Core::CoreWindow ^ window = Windows::UI::Xaml::Window::Current->CoreWindow;
    window->VisibilityChanged += ref new Windows::Foundation::TypedEventHandler<Windows::UI::Core::CoreWindow ^,
      Windows::UI::Core::VisibilityChangedEventArgs ^>(this, &OpenGLESPage::OnVisibilityChanged);
    this->Loaded += ref new Windows::UI::Xaml::RoutedEventHandler(this, &OpenGLESPage::OnPageLoaded);
 }
 OpenGLESPage::~OpenGLESPage()
 {
    StopRenderLoop();
    DestroyRenderSurface();
 }
 void OpenGLESPage::OnPageLoaded(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e)
 {
    CreateRenderSurface();
    StartRenderLoop();
 }
 void OpenGLESPage::OnVisibilityChanged(Windows::UI::Core::CoreWindow ^ sender,
    Windows::UI::Core::VisibilityChangedEventArgs ^ args)
 {
    if (args->Visible && mRenderSurface != EGL_NO_SURFACE) {
        StartRenderLoop();
    } else {
        StopRenderLoop();
    }
 }
 void OpenGLESPage::CreateRenderSurface()
 {
    if (mOpenGLES && mRenderSurface == EGL_NO_SURFACE) {
        mRenderSurface = mOpenGLES->CreateSurface(swapChainPanel);
    }
 }
 void OpenGLESPage::DestroyRenderSurface()
 {
    if (mOpenGLES) {
        mOpenGLES->DestroySurface(mRenderSurface);
    }
    mRenderSurface = EGL_NO_SURFACE;
 }
 void OpenGLESPage::RecoverFromLostDevice()
 {
    StopRenderLoop();
    {
        critical_section::scoped_lock lock(mRenderSurfaceCriticalSection);
        DestroyRenderSurface();
        mOpenGLES->Reset();
        CreateRenderSurface();
    }
    StartRenderLoop();
 }
 void OpenGLESPage::StartRenderLoop()
 {
    if (mRenderLoopWorker != nullptr && mRenderLoopWorker->Status == Windows::Foundation::AsyncStatus::Started) {
        return;
    }
    auto loop = [this](Windows::Foundation::IAsyncAction ^ action) {
      critical_section::scoped_lock lock(mRenderSurfaceCriticalSection);
      HANDLE hEvent = ::CreateEventA(nullptr, FALSE, FALSE, sWakeupEvent);
      // Called by Servo
      Servo::sMakeCurrent = [this]() {
        /* EGLint panelWidth = 0; */
        /* EGLint panelHeight = 0; */
        /* mOpenGLES->GetSurfaceDimensions(mRenderSurface, &panelWidth, &panelHeight); */
        /* glViewport(0, 0, panelWidth, panelHeight); */
        /* mServo->SetSize(panelWidth, panelHeight); */
        mOpenGLES->MakeCurrent(mRenderSurface);
      };
      // Called by Servo
      Servo::sFlush = [this]() {
        if (mOpenGLES->SwapBuffers(mRenderSurface) != GL_TRUE) {
          // The call to eglSwapBuffers might not be successful (i.e. due to Device Lost)
          // If the call fails, then we must reinitialize EGL and the GL resources.
          swapChainPanel->Dispatcher->RunAsync(Windows::UI::Core::CoreDispatcherPriority::High,
              ref new Windows::UI::Core::DispatchedHandler([=]() {
                RecoverFromLostDevice();
          }, CallbackContext::Any));
        }
      };
      mOpenGLES->MakeCurrent(mRenderSurface);
      EGLint panelWidth = 0;
      EGLint panelHeight = 0;
      mOpenGLES->GetSurfaceDimensions(mRenderSurface, &panelWidth, &panelHeight);
      glViewport(0, 0, panelWidth, panelHeight);
      mServo = new Servo(panelWidth, panelHeight);
      while (action->Status == Windows::Foundation::AsyncStatus::Started) {
        // Block until Servo::sWakeUp is called.
        // Or run full speed if animating (see on_animating_changed),
        // it will endup blocking on SwapBuffers to limit rendering to 60FPS
        if (!Servo::sAnimating) {
           ::WaitForSingleObject(hEvent, INFINITE);
        }
        mServo->PerformUpdates();
      }
    };
    auto workItemHandler = ref new Windows::System::Threading::WorkItemHandler(loop);
    // Run Servo task in a high priority background thread.
    mRenderLoopWorker = Windows::System::Threading::ThreadPool::RunAsync(
      workItemHandler,
      Windows::System::Threading::WorkItemPriority::High,
      Windows::System::Threading::WorkItemOptions::TimeSliced);
    Servo::sWakeUp = []() {
      HANDLE hEvent = ::OpenEventA(EVENT_ALL_ACCESS, FALSE, sWakeupEvent);
      ::SetEvent(hEvent);
    };
 }
 void OpenGLESPage::StopRenderLoop()
 {
    if (mRenderLoopWorker) {
        mRenderLoopWorker->Cancel();
        mRenderLoopWorker = nullptr;
    }
 }
--- a/support/hololens/OpenGLESPage.xaml.h
+++ b/support/hololens/OpenGLESPage.xaml.h
@ -0,0 +1,37 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #pragma once
 #include "OpenGLES.h"
 #include "OpenGLESPage.g.h"
 #include "Servo.h"
 namespace hlservo {
 public
 ref class OpenGLESPage sealed {
 public:
    OpenGLESPage();
    virtual ~OpenGLESPage();
    internal : OpenGLESPage(OpenGLES* openGLES);
 private:
    void OnPageLoaded(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
    void OnVisibilityChanged(Windows::UI::Core::CoreWindow ^ sender,
        Windows::UI::Core::VisibilityChangedEventArgs ^ args);
    void CreateRenderSurface();
    void DestroyRenderSurface();
    void RecoverFromLostDevice();
    void StartRenderLoop();
    void StopRenderLoop();
    OpenGLES* mOpenGLES;
    EGLSurface mRenderSurface;
    Concurrency::critical_section mRenderSurfaceCriticalSection;
    Windows::Foundation::IAsyncAction ^ mRenderLoopWorker;
    Servo* mServo;
 };
 }
--- a/support/hololens/Package.appxmanifest
+++ b/support/hololens/Package.appxmanifest
@ -0,0 +1,46 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Package
  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
  IgnorableNamespaces="uap mp">
  <Identity Publisher="CN=allizom" Version="1.0.23.0"  Name="ServoApp"/>
  <mp:PhoneIdentity PhoneProductId="763af792-8716-4528-af46-5e364a20e6aa" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
  <Properties>
    <DisplayName>Servo</DisplayName>
    <PublisherDisplayName>Allizom</PublisherDisplayName>
    <Logo>Assets\StoreLogo.png</Logo>
  </Properties>
  <Dependencies>
    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
  </Dependencies>
  <Resources>
    <Resource Language="x-generate"/>
  </Resources>
  <Applications>
    <Application Id="App"
      Executable="$targetnametoken$.exe"
      EntryPoint="hlservo.App">
      <uap:VisualElements
        DisplayName="hlservo"
        Square150x150Logo="Assets\Square150x150Logo.png"
        Square44x44Logo="Assets\Square44x44Logo.png"
        Description="hlservo"
        BackgroundColor="transparent">
        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
        <uap:SplashScreen Image="Assets\SplashScreen.png" />
      </uap:VisualElements>
    </Application>
  </Applications>
  <Capabilities>
    <Capability Name="internetClient" />
  </Capabilities>
 </Package>
--- a/support/hololens/ProjectDefaultFilters.vcxproj.filters
+++ b/support/hololens/ProjectDefaultFilters.vcxproj.filters
@ -0,0 +1,30 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup>
    <Filter Include="Assets">
      <UniqueIdentifier>d64db011-1240-48ad-a857-7af0ffd781dc</UniqueIdentifier>
      <Extensions>bmp;fbx;gif;jpg;jpeg;tga;tiff;tif;png</Extensions>
    </Filter>
    <Filter Include="Binaries">
      <Extensions>dll;</Extensions>
    </Filter>
    <Image Include="Assets\LockScreenLogo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\SplashScreen.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Square150x150Logo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Square44x44Logo.scale-200.png">
      <Filter>Assets</Filter>
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      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Wide310x150Logo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
  </ItemGroup>
 </Project>
--- a/support/hololens/Servo.cpp
+++ b/support/hololens/Servo.cpp
@ -0,0 +1,83 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #include "pch.h"
 #include "Servo.h"
 extern "C" {
 #include <simpleservo.h>
 }
 using namespace hlservo;
 void on_load_started() {}
 void on_load_ended() {}
 void on_title_changed(const char* title) {}
 void on_url_changed(const char* url) {}
 void on_history_changed(bool back, bool fwd) {}
 void on_shutdown_complete() {}
 std::function<void()> Servo::sFlush = [](){};
 std::function<void()> Servo::sMakeCurrent = [](){};
 std::function<void()> Servo::sWakeUp = [](){};
 bool Servo::sAnimating = false;
 void flush() {
  Servo::sFlush();
 }
 void make_current() {
  Servo::sMakeCurrent();
 }
 void wakeup() {
  Servo::sWakeUp();
 }
 void on_animating_changed(bool aAnimating) {
  Servo::sAnimating = aAnimating;
 }
 Servo::Servo(GLsizei width, GLsizei height)
  : mAnimating(false)
  , mWindowHeight(height)
  , mWindowWidth(width) {
  CInitOptions o;
  o.args = NULL;
  o.url = "http://example.com";
  o.width = mWindowWidth;
  o.height = mWindowHeight;
  o.density = 1.0;
  o.enable_subpixel_text_antialiasing = false;
  CHostCallbacks c;
  c.flush = &flush;
  c.make_current = &make_current;
  c.on_load_started = &on_load_started;
  c.on_load_ended = &on_load_ended;
  c.on_title_changed = &on_title_changed;
  c.on_url_changed = &on_url_changed;
  c.on_history_changed = &on_history_changed;
  c.on_animating_changed = &on_animating_changed;
  c.on_shutdown_complete = &on_shutdown_complete;
  init_with_egl(o, &wakeup, c);
 }
 Servo::~Servo() {
  deinit();
 }
 void Servo::PerformUpdates() {
  perform_updates();
 }
 void Servo::SetSize(GLsizei width, GLsizei height) {
  if (width != mWindowWidth || height != mWindowHeight) {
    mWindowWidth = width;
    mWindowHeight = height;
    resize(mWindowWidth, mWindowHeight);
  }
 }
--- a/support/hololens/Servo.h
+++ b/support/hololens/Servo.h
@ -0,0 +1,31 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #pragma once
 #include "pch.h"
 namespace hlservo {
 class Servo {
 public:
    Servo(GLsizei width, GLsizei height);
    ~Servo();
    void PerformUpdates();
    void SetSize(GLsizei width, GLsizei height);
    // Static lambas called by Servo callbacks.
    // Will be called from any thead
    static std::function<void()> sWakeUp;
    // Will be called from GL thread
    static std::function<void()> sFlush;
    static std::function<void()> sMakeCurrent;
    static bool sAnimating;
 private:
    GLsizei mWindowWidth;
    GLsizei mWindowHeight;
    bool mAnimating;
 };
 }
--- a/support/hololens/ServoApp.sln
+++ b/support/hololens/ServoApp.sln
@ -0,0 +1,43 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
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 VisualStudioVersion = 16.0.28803.352
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ServoApp", "ServoApp.vcxproj", "{7134432A-49F2-4DC7-8F72-06F873A683EC}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM = Debug|ARM
 		Debug|x64 = Debug|x64
 		Debug|x86 = Debug|x86
 		Release|ARM = Release|ARM
 		Release|x64 = Release|x64
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{7134432A-49F2-4DC7-8F72-06F873A683EC}.Debug|ARM.ActiveCfg = Debug|ARM
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 		{7134432A-49F2-4DC7-8F72-06F873A683EC}.Release|x86.Build.0 = Release|Win32
 		{7134432A-49F2-4DC7-8F72-06F873A683EC}.Release|x86.Deploy.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {58EFB63D-FFA2-4263-AE6A-6764E4E04CCA}
 	EndGlobalSection
 EndGlobal
--- a/support/hololens/ServoApp.vcxproj
+++ b/support/hololens/ServoApp.vcxproj
@ -0,0 +1,436 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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    <DefaultLanguage>en-US</DefaultLanguage>
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    <WindowsTargetPlatformMinVersion>10.0.17763.0</WindowsTargetPlatformMinVersion>
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  <PropertyGroup>
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    <Link>
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      <DeploymentContent Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</DeploymentContent>
    </None>
    <None Include="packages.config" />
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  </ItemGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
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  </Target>
 </Project>
--- a/support/hololens/ServoApp.vcxproj.filters
+++ b/support/hololens/ServoApp.vcxproj.filters
@ -0,0 +1,245 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup>
    <ClCompile Include="$(MSBuildThisFileDirectory)OpenGLES.cpp">
      <Filter>src</Filter>
    </ClCompile>
    <ClCompile Include="$(MSBuildThisFileDirectory)pch.cpp">
      <Filter>src</Filter>
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    <ClCompile Include="Servo.cpp">
      <Filter>src</Filter>
    </ClCompile>
    <ClCompile Include="App.xaml.cpp" />
    <ClCompile Include="OpenGLESPage.xaml.cpp" />
  </ItemGroup>
  <ItemGroup>
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      <Filter>src</Filter>
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    </ClInclude>
    <ClInclude Include="Servo.h">
      <Filter>src</Filter>
    </ClInclude>
    <ClInclude Include="App.xaml.h" />
    <ClInclude Include="OpenGLESPage.xaml.h" />
  </ItemGroup>
  <ItemGroup>
    <Image Include="Assets\SplashScreen.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Square44x44Logo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Square44x44Logo.targetsize-24_altform-unplated.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Square150x150Logo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\StoreLogo.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\Wide310x150Logo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
    <Image Include="Assets\LockScreenLogo.scale-200.png">
      <Filter>Assets</Filter>
    </Image>
  </ItemGroup>
  <ItemGroup>
    <AppxManifest Include="Package.appxmanifest" />
  </ItemGroup>
  <ItemGroup>
    <None Include="ServoApp_TemporaryKey.pfx" />
    <None Include="packages.config" />
    <None Include="..\..\target\debug\api-ms-win-crt-runtime-l1-1-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\ffi-7.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gio-2.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\glib-2.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gmodule-2.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gobject-2.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstapp-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstaudio-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstbase-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstgl-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstpbutils-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstplayer-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstreamer-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstrtp-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstsdp-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gsttag-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstvideo-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\gstwebrtc-1.0-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\intl-8.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\libeay32.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\libwinpthread-1.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\msvcp140.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\orc-0.4-0.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\simpleservo.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\ssleay32.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\vcruntime140.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\debug\z-1.dll">
      <Filter>ServoDLLsDebug</Filter>
    </None>
    <None Include="..\..\target\release\z-1.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\vcruntime140.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\ssleay32.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\simpleservo.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\orc-0.4-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\msvcp140.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\libwinpthread-1.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\libeay32.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\intl-8.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstwebrtc-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstvideo-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gsttag-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstsdp-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstrtp-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstreamer-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstplayer-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstpbutils-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstgl-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstbase-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstaudio-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gstapp-1.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gobject-2.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gmodule-2.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\glib-2.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\gio-2.0-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\ffi-7.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
    <None Include="..\..\target\release\api-ms-win-crt-runtime-l1-1-0.dll">
      <Filter>ServoDLLsRelease</Filter>
    </None>
  </ItemGroup>
  <ItemGroup>
    <Filter Include="Assets">
      <UniqueIdentifier>{f663883d-5302-4e09-82e3-094b0a4fa9bc}</UniqueIdentifier>
    </Filter>
    <Filter Include="src">
      <UniqueIdentifier>{45140811-c74b-4497-ba07-a7610fe2fef9}</UniqueIdentifier>
    </Filter>
    <Filter Include="ServoDLLsDebug">
      <UniqueIdentifier>{851a4628-484c-4859-bb9b-3153914487f5}</UniqueIdentifier>
    </Filter>
    <Filter Include="ServoDLLsRelease">
      <UniqueIdentifier>{96a56d11-301b-46ec-b081-50010b467ebf}</UniqueIdentifier>
    </Filter>
  </ItemGroup>
  <ItemGroup>
    <ApplicationDefinition Include="App.xaml">
      <Filter>src</Filter>
    </ApplicationDefinition>
  </ItemGroup>
  <ItemGroup>
    <Page Include="OpenGLESPage.xaml">
      <Filter>src</Filter>
    </Page>
  </ItemGroup>
 </Project>
--- a/support/hololens/ServoApp_TemporaryKey.pfx
+++ b/support/hololens/ServoApp_TemporaryKey.pfx
--- a/support/hololens/packages.config
+++ b/support/hololens/packages.config
@ -0,0 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
  <package id="ANGLE.WindowsStore" version="2.1.13" targetFramework="native" />
 </packages>
--- a/support/hololens/pch.cpp
+++ b/support/hololens/pch.cpp
@ -0,0 +1,5 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #include "pch.h"
--- a/support/hololens/pch.h
+++ b/support/hololens/pch.h
@ -0,0 +1,19 @@
 /* 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 https://mozilla.org/MPL/2.0/. */
 #pragma once
 #include <concrt.h>
 #include <ppltasks.h>
 #define GL_GLEXT_PROTOTYPES
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #include <EGL/eglplatform.h>
 #include <angle_windowsstore.h>