public override bool BeginDraw()
{
if (GraphicsDevice != null && Window.Visible)
{
savedPresenter = GraphicsDevice.Presenter;
savedViewport = GraphicsDevice.Viewport;
CreateOrUpdatePresenter();
if (isBackBufferToResize || windowUserResized)
{
PixelFormat resizeFormat;
var size = GetRequestedSize(out resizeFormat);
Presenter.Resize(size.Width, size.Height, resizeFormat);
isBackBufferToResize = false;
windowUserResized = false;
}
GraphicsDevice.Presenter = Presenter;
GraphicsDevice.SetViewport(Presenter.DefaultViewport);
GraphicsDevice.SetRenderTargets(Presenter.DepthStencilBuffer, Presenter.BackBuffer);
beginDrawOk = true;
return true;
}
beginDrawOk = false;
return false;
}
/// <summary>
/// Prepares control surface for rendering.
/// </summary>
private void StartRendering()
{
Debug.Assert(_presenter == null);
Debug.Assert(_graphicsDevice.Presenter == null);
Debug.Assert(_graphicsDevice != null);
Redraw();
var parameters = new PresentationParameters((int)ActualWidth, (int)ActualHeight, swapChainPanel);
_presenter = _disposeCollector.Collect(new SwapChainGraphicsPresenter(_graphicsDevice, parameters));
_graphicsDevice.Presenter = _presenter;
Debug.Assert(_bitmapTarget == null);
CreateD2DRenderTarget();
CompositionTarget.Rendering += HandleRendering;
}
public void ResizePresenter()
{
int width = m_host.HostedWindowWidth;
int height = m_host.HostedWindowHeight;
if (width == 0 || height == 0)
{
RemoveAndDispose(ref m_presenter);
return;
}
bool sizeChanged;
if (m_presenter == null)
{
var presentParams = new PresentationParameters(width, height, m_host.Handle, m_pixelFormat)
{
PresentationInterval = PresentInterval.Immediate,
};
m_presenter = ToDispose(new SwapChainGraphicsPresenter(m_device, presentParams));
sizeChanged = true;
}
else
{
// Resize is a no-op if the size hasn't changed
sizeChanged = m_presenter.Resize(width, height, m_pixelFormat);
}
if (sizeChanged)
{
if (this.SizeChanged != null)
this.SizeChanged(width, height);
}
}
/// <summary>
/// Unloads content and disposes all unmanaged resources.
/// </summary>
private void DisposeAndUnloadContent()
{
_disposeCollector.DisposeAndClear();
_d2dDeviceContext = null;
_d2dDevice = null;
_dwFactory = null;
_presenter = null;
_graphicsDevice = null;
}
