private SurfaceWithInfo WaitForNewFrame()
{
_currentFrame?.Dispose();
_frameEvent.Reset();//获取新帧
var whiteRegion = new SharpDX.Direct3D11.ResourceRegion(0, 0, 0, 1920, 1080, 1);
var signaledEvent = _events[WaitHandle.WaitAny(_events)];
if (signaledEvent == _closedEvent)
{
Cleanup();
return(null);
}
var result = new SurfaceWithInfo {
SystemRelativeTime = _currentFrame.SystemRelativeTime
};
using (var multithreadLock = new MultithreadLock(_multithread))
using (var sourceTexture = Direct3D11Helpers.CreateSharpDXTexture2D(_currentFrame.Surface))
{
_d3dDevice.ImmediateContext.ClearRenderTargetView(_composeRenderTargetView, new SharpDX.Mathematics.Interop.RawColor4(0, 0, 0, 1));
var region = new SharpDX.Direct3D11.ResourceRegion(LocationX > 0?LocationX:0, LocationY > 0?LocationY:0, 0,
(LocationX + 1920 > sourceTexture.Description.Width ? sourceTexture.Description.Width : LocationX + 1920),
(LocationY + 1080 > sourceTexture.Description.Height ? sourceTexture.Description.Height : LocationY + 1080), 1);
_d3dDevice.ImmediateContext.CopySubresourceRegion(sourceTexture, 0, whiteRegion, _blankComposeTexture, 0); //覆盖掉原本区域
_d3dDevice.ImmediateContext.CopySubresourceRegion(sourceTexture, 0, region, _tarComposeTexture, LocationX >= 0?0:(1920 + LocationX > 0? 1920 + LocationX - 1:0),
LocationY >= 0?0:(1080 + LocationY - 1 > 0? 1080 + LocationY - 1:0), 0); //_targetTexture为剪切后的区域
//https://stackoverflow.com/questions/64130136/texture2d-from-byte-array-sharpdx
//实现空白区域
var description = _tarComposeTexture.Description;
description.Usage = SharpDX.Direct3D11.ResourceUsage.Default;
description.BindFlags = SharpDX.Direct3D11.BindFlags.ShaderResource | SharpDX.Direct3D11.BindFlags.RenderTarget;
description.CpuAccessFlags = SharpDX.Direct3D11.CpuAccessFlags.None;
description.OptionFlags = SharpDX.Direct3D11.ResourceOptionFlags.None;
using (var copyTexture = new SharpDX.Direct3D11.Texture2D(_d3dDevice, description))
{
_d3dDevice.ImmediateContext.CopyResource(_tarComposeTexture, copyTexture);
result.Surface = Direct3D11Helpers.CreateDirect3DSurfaceFromSharpDXTexture(copyTexture);
}
}
return(result);
}
private void OnFrameArrived(Direct3D11CaptureFramePool sender, object args)
{
var newSize = false;
using (var frame = sender.TryGetNextFrame())
{
if (frame.ContentSize.Width != _lastSize.Width ||
frame.ContentSize.Height != _lastSize.Height)
{
// 源已改变,故需要变换抓取大小,首先改变swap chain,之后是Texture
newSize = true;
_lastSize = frame.ContentSize;
_swapChain.ResizeBuffers(
2,
_lastSize.Width,
_lastSize.Height,
SharpDX.DXGI.Format.B8G8R8A8_UNorm,
SharpDX.DXGI.SwapChainFlags.None);
}
using (var sourceTexture = Direct3D11Helpers.CreateSharpDXTexture2D(frame.Surface))
using (var backBuffer = _swapChain.GetBackBuffer <SharpDX.Direct3D11.Texture2D>(0))
using (var renderTargetView = new SharpDX.Direct3D11.RenderTargetView(_d3dDevice, backBuffer))
{
_d3dDevice.ImmediateContext.ClearRenderTargetView(renderTargetView, new SharpDX.Mathematics.Interop.RawColor4(0, 0, 0, 1));
_d3dDevice.ImmediateContext.CopyResource(sourceTexture, backBuffer);
}
}
_swapChain.Present(1, SharpDX.DXGI.PresentFlags.None);
if (newSize)//帧池重构
{
_framePool.Recreate(
_device,
DirectXPixelFormat.B8G8R8A8UIntNormalized,
2,
_lastSize);
}
}
