public SwapChain(GraphicsDevice graphicsDevice)
{
GraphicsDevice = graphicsDevice;
Description = graphicsDevice.NativeParameters;
CreateSwapChain();
BackBufferIndex = NativeSwapChain.GetCurrentBackBufferIndex();
BackBuffer = new Texture(GraphicsDevice);
BackBuffer.InitializeFromImpl(NativeSwapChain.GetBuffer <ID3D12Resource>(BackBufferIndex));
}
private void CreateDXGI()
{
var res = CreateDXGIFactory1 <IDXGIFactory4>(out factory);
device = CreateDevice(factory);
if (device == null)
{
throw new InvalidOperationException("device cannot be null");
}
commandQueue = CreateCommandQueue(device);
swapChain = CreateSwapChain(factory, commandQueue, Format.R8G8B8A8_UNorm);
rtvHeap.usedEntries = 0;
rtvHeap.Heap = CreateDescriptorHeap(device, rtvHeapSize, DescriptorHeapType.RenderTargetView, false);
frameObjects = new FrameObject[DefaultSwapChainBuffers];
for (int i = 0; i < DefaultSwapChainBuffers; i++)
{
frameObjects[i] = new FrameObject();
frameObjects[i].cmdAllocator = device.CreateCommandAllocator(CommandListType.Direct);
frameObjects[i].swapChainBuffer = swapChain.GetBuffer <ID3D12Resource>(i);
frameObjects[i].rtvHandle = CreateRenderTargetView(device, frameObjects[i].swapChainBuffer, rtvHeap.Heap,
ref rtvHeap.usedEntries, Format.R8G8B8A8_UNorm_SRgb);
}
var cmdList = device.CreateCommandList(0, CommandListType.Direct, frameObjects[0].cmdAllocator, null);
commandList = cmdList.QueryInterface <ID3D12GraphicsCommandList4>();
fence = device.CreateFence(0, FenceFlags.None);
fenceEvent = new EventWaitHandle(false, EventResetMode.AutoReset);
}
internal void Resize()
{
// 等到以前的所有 GPU 工作完成。
device.WaitForGpu();
// 清除特定于先前窗口大小的内容。
for (int n = 0; n < c_frameCount; n++)
{
m_renderTargets[n]?.Dispose();
m_renderTargets[n] = null;
renderTargetResourceStates[n] = ResourceStates.Common;
}
if (m_swapChain != null)
{
// 如果交换链已存在，请调整其大小。
Result hr = m_swapChain.ResizeBuffers(c_frameCount, this.width, this.height, format, SwapChainFlags.AllowTearing);
ThrowIfFailed(hr);
}
else
{
// 否则，使用与现有 Direct3D 设备相同的适配器新建一个。
SwapChainDescription1 swapChainDescription1 = new SwapChainDescription1();
swapChainDescription1.Width = this.width; // 匹配窗口的大小。
swapChainDescription1.Height = this.height;
swapChainDescription1.Format = format;
swapChainDescription1.Stereo = false;
swapChainDescription1.SampleDescription.Count = 1; // 请不要使用多采样。
swapChainDescription1.SampleDescription.Quality = 0;
swapChainDescription1.BufferUsage = Usage.RenderTargetOutput;
swapChainDescription1.BufferCount = c_frameCount; // 使用三重缓冲最大程度地减小延迟。
swapChainDescription1.SwapEffect = SwapEffect.FlipSequential;
swapChainDescription1.Flags = SwapChainFlags.AllowTearing;
swapChainDescription1.Scaling = Scaling.Stretch;
swapChainDescription1.AlphaMode = AlphaMode.Ignore;
var swapChain = device.m_dxgiFactory.CreateSwapChainForHwnd(device.commandQueue, hwnd, swapChainDescription1);
m_swapChain?.Dispose();
m_swapChain = swapChain.QueryInterface <IDXGISwapChain3>();
swapChain.Dispose();
}
for (int n = 0; n < c_frameCount; n++)
{
ThrowIfFailed(m_swapChain.GetBuffer(n, out m_renderTargets[n]));
}
}
private void InitDXR(IntPtr winHandle, int winWidth, int winHeight)
{
mHwnd = winHandle;
this.mSwapChainRect = new Rect(0, 0, winWidth, winHeight);
// Initialize the debug layer for debug builds
#if DEBUG
if (D3D12.D3D12GetDebugInterface <ID3D12Debug>(out var pDx12Debug).Success)
{
pDx12Debug.EnableDebugLayer();
}
#endif
// Create the DXGI factory
IDXGIFactory4 pDXGIFactory;
DXGI.CreateDXGIFactory1 <IDXGIFactory4>(out pDXGIFactory);
mpDevice = this.context.CreateDevice(pDXGIFactory);
mpCmdQueue = this.context.CreateCommandQueue(mpDevice);
mpSwapChain = this.context.CreateDXGISwapChain(pDXGIFactory, mHwnd, winWidth, winHeight, Format.R8G8B8A8_UNorm, mpCmdQueue);
// Create a RTV descriptor heap
mRtvHeap.Heap = this.context.CreateDescriptorHeap(mpDevice, kRtvHeapSize, DescriptorHeapType.RenderTargetView, false);
// Create the per-frame objects
this.mFrameObjects = new FrameObject[this.context.kDefaultSwapChainBuffers];
for (int i = 0; i < this.context.kDefaultSwapChainBuffers; i++)
{
mFrameObjects[i].pCmdAllocator = mpDevice.CreateCommandAllocator(CommandListType.Direct);
mFrameObjects[i].pSwapChainBuffer = mpSwapChain.GetBuffer <ID3D12Resource>(i);
mFrameObjects[i].rtvHandle = context.CreateRTV(mpDevice, mFrameObjects[i].pSwapChainBuffer, mRtvHeap.Heap, ref mRtvHeap.usedEntries, Format.R8G8B8A8_UNorm_SRgb);
}
// Create the command-list
var cmdList = mpDevice.CreateCommandList(0, CommandListType.Direct, mFrameObjects[0].pCmdAllocator, null);
this.mpCmdList = cmdList.QueryInterface <ID3D12GraphicsCommandList4>();
// Create a fence and the event
this.mpFence = mpDevice.CreateFence(0, FenceFlags.None);
this.mFenceEvent = new EventWaitHandle(false, EventResetMode.AutoReset);
}