/// <summary>
/// Create a new instance of <see cref="SwapChain"/> class.
/// </summary>
/// <param name="device">The creation <see cref="GraphicsDevice"/></param>
/// <param name="descriptor">The <see cref="SwapChainDescriptor"/></param>
protected SwapChain(GraphicsDevice device, SwapChainDescriptor descriptor)
: base(device, GraphicsResourceType.SwapChain, GraphicsResourceUsage.Default)
{
Guard.NotNull(device, nameof(device), $"{nameof(GraphicsDevice)} cannot be null");
}
protected unsafe SwapChainDXGI(
GraphicsDevice device,
SwapChainDescriptor descriptor,
IDXGIFactory1 dxgiFactory,
ComObject deviceOrCommandQueue,
int bufferCount,
int backBufferCount)
: base(device, descriptor)
{
BackBufferCount = backBufferCount;
var width = Math.Max(descriptor.Width, 1);
var height = Math.Max(descriptor.Height, 1);
switch (descriptor.Handle)
{
case Win32SwapChainHandle win32Handle:
{
// Check tearing support.
var dxgiFactory5 = dxgiFactory.QueryInterfaceOrNull <IDXGIFactory5>();
var allowTearing = false;
if (dxgiFactory5 != null)
{
if (dxgiFactory5.PresentAllowTearing)
{
// Recommended to always use tearing if supported when using a sync interval of 0.
_syncInterval = 0;
_presentFlags |= PresentFlags.AllowTearing;
allowTearing = true;
}
dxgiFactory5.Dispose();
}
var dxgiFactory2 = dxgiFactory.QueryInterfaceOrNull <IDXGIFactory2>();
if (dxgiFactory2 != null)
{
var swapchainDesc = new SwapChainDescription1()
{
Width = width,
Height = height,
Format = BackBufferFormat,
Stereo = false,
SampleDescription = new SampleDescription(1, 0),
Usage = Usage.RenderTargetOutput,
BufferCount = bufferCount,
Scaling = Scaling.Stretch,
SwapEffect = allowTearing ? SwapEffect.FlipDiscard : SwapEffect.Discard,
AlphaMode = AlphaMode.Ignore,
Flags = allowTearing ? SwapChainFlags.AllowTearing : SwapChainFlags.None,
};
var fullscreenDescription = new SwapChainFullscreenDescription
{
Windowed = true
};
_swapChain = dxgiFactory2.CreateSwapChainForHwnd(
deviceOrCommandQueue,
win32Handle.HWnd,
swapchainDesc,
fullscreenDescription);
dxgiFactory2.Dispose();
}
else
{
SwapChainDescription dxgiSCDesc = new SwapChainDescription
{
BufferCount = bufferCount,
IsWindowed = true,
BufferDescription = new ModeDescription(width, height, BackBufferFormat),
OutputWindow = win32Handle.HWnd,
SampleDescription = new SampleDescription(1, 0),
SwapEffect = SwapEffect.Discard,
Usage = Usage.Backbuffer | Usage.RenderTargetOutput
};
_swapChain = dxgiFactory.CreateSwapChain(deviceOrCommandQueue, dxgiSCDesc);
}
dxgiFactory.MakeWindowAssociation(win32Handle.HWnd, WindowAssociationFlags.IgnoreAll);
}
break;
//case CoreWindow coreWindowHandle:
// {
// var coreWindow = coreWindowHandle.CoreWindow;
// var swapchainDesc = new DXGI.SwapChainDescription1()
// {
// Width = width,
// Height = height,
// Format = DXGI.Format.B8G8R8A8_UNorm,
// Stereo = false,
// SampleDescription = new DXGI.SampleDescription(1, 0),
// Usage = DXGI.Usage.RenderTargetOutput,
// BufferCount = FrameCount,
// Scaling = DXGI.Scaling.AspectRatioStretch,
// SwapEffect = DXGI.SwapEffect.FlipDiscard,
// AlphaMode = DXGI.AlphaMode.Ignore,
// Flags = DXGI.SwapChainFlags.None,
// };
// using (var comCoreWindow = new ComObject(coreWindow))
// {
// _swapChain = new DXGI.SwapChain1(
// factory,
// device.D3DDevice,
// comCoreWindow,
// ref swapchainDesc);
// }
// }
// break;
}
}