void StartRenderLoop()
{
// If the render loop is already running then do not start another thread.
if (mRenderLoopWorker != null && mRenderLoopWorker.Status == AsyncStatus.Started)
{
return;
}
//var throttler = new Helpers.EventThrottler<TextChangedEventArgs>(Constants.TypingTimeout, handler => SearchField.TextChanged += new TextChangedEventHandler(handler));
//throttler.Invoked += (s, args) =>
//{
// // s is SearchField
// // args is TextChangedEventArgs
//};
// Create a task for rendering that will be run on a background thread.
var workItemHandler =
new Windows.System.Threading.WorkItemHandler(action =>
{
lock (mRenderSurfaceCriticalSection)
{
mOpenGLES.MakeCurrent(mRenderSurface);
//var renderer = new RendererBase();
var renderer = RendererInit();
while (action.Status == AsyncStatus.Started)
{
int panelWidth = 0;
int panelHeight = 0;
mOpenGLES.GetSurfaceDimensions(mRenderSurface, ref panelWidth, ref panelHeight);
// Logic to update the scene could go here
renderer.UpdateWindowSize(panelWidth, panelHeight);
renderer.Draw();
// 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.
if (mOpenGLES.SwapBuffers(mRenderSurface) != EGL.TRUE)
{
// XAML objects like the SwapChainPanel must only be manipulated on the UI thread.
#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
swapChainPanel.Dispatcher.RunAsync(CoreDispatcherPriority.High,
new DispatchedHandler(() =>
{
RecoverFromLostDevice();
}));
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
return;
}
}
}
});
// Run task on a dedicated high priority background thread.
mRenderLoopWorker = Windows.System.Threading.ThreadPool.RunAsync(workItemHandler,
Windows.System.Threading.WorkItemPriority.High,
Windows.System.Threading.WorkItemOptions.TimeSliced);
}
void StartRenderLoop()
{
// If the render loop is already running then do not start another thread.
if (_renderLoopWorker != null && _renderLoopWorker.Status == Windows.Foundation.AsyncStatus.Started)
{
return;
}
// Create a task for rendering that will be run on a background thread.
var workItemHandler = new Windows.System.Threading.WorkItemHandler((Windows.Foundation.IAsyncAction action) => {
lock (_renderSurfaceLock) {
_eglContext.MakeCurrent(_renderSurface);
int oldPanelWidth = -1;
int oldPanelHeight = -1;
while (action.Status == Windows.Foundation.AsyncStatus.Started)
{
int panelWidth = 0;
int panelHeight = 0;
GetSwapChainPanelSize(out panelWidth, out panelHeight);
if (panelWidth != oldPanelWidth || panelHeight != oldPanelHeight)
{
_baseMapView.OnSurfaceChanged(panelWidth, panelHeight);
oldPanelWidth = panelWidth;
oldPanelHeight = panelHeight;
}
_baseMapView.OnDrawFrame();
// 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.
if (!_eglContext.SwapBuffers(_renderSurface))
{
// XAML objects like the SwapChainPanel must only be manipulated on the UI thread.
var worker = _swapChainPanel.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new Windows.UI.Core.DispatchedHandler(() => {
RecoverFromLostDevice();
}));
worker.Close();
return;
}
_swapChainEvent.WaitOne();
_swapChainEvent.Reset();
}
}
});
// Run task on a dedicated high priority background thread.
_renderLoopWorker = Windows.System.Threading.ThreadPool.RunAsync(workItemHandler, Windows.System.Threading.WorkItemPriority.Normal, Windows.System.Threading.WorkItemOptions.TimeSliced);
}
void StartRenderLoop()
{
// If the render loop is already running then do not start another thread.
if (mRenderLoopWorker != null && mRenderLoopWorker.Status == Windows.Foundation.AsyncStatus.Started)
{
return;
}
// Create a task for rendering that will be run on a background thread.
var workItemHandler = new Windows.System.Threading.WorkItemHandler(action =>
{
lock (mRenderSurfaceCriticalSection)
{
mOpenGLES.MakeCurrent(mRenderSurface);
// ANGLE seems to take a few frames to get itself up and running. This manifests as
// calls to glGenTextures returning 0 as a texture name. I don't know why this is,
// but we wait until glGenTextures gives us a nonzero texture name before declaring
// ANGLE initialized, and only then do we continue onto the main draw loop, meaning
// that the user can remain blissfully unaware of this wrinkle.
while (action.Status == AsyncStatus.Started)
{
var tex = GL.GenTexture();
if (tex != 0)
{
GL.DeleteTexture(tex);
break;
}
}
while (action.Status == AsyncStatus.Started)
{
int panelWidth = 0;
int panelHeight = 0;
mOpenGLES.GetSurfaceDimensions(mRenderSurface, ref panelWidth, ref panelHeight);
GL.Viewport(0, 0, panelWidth, panelHeight);
try
{
OnDraw(EventArgs.Empty);
}
catch (Exception e)
{
Debug.WriteLine($"Exception during OnDraw: {e}");
}
// 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.
if (mOpenGLES.SwapBuffers(mRenderSurface) != EGL.TRUE)
{
// XAML objects like the SwapChainPanel must only be manipulated on the UI thread.
_ = Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High,
new Windows.UI.Core.DispatchedHandler(() =>
{
RecoverFromLostDevice();
}));
return;
}
}
}
});
// Run task on a dedicated high priority background thread.
mRenderLoopWorker = Windows.System.Threading.ThreadPool.RunAsync(workItemHandler,
Windows.System.Threading.WorkItemPriority.High,
Windows.System.Threading.WorkItemOptions.TimeSliced);
}