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/* 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;
}
}
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