Multithreading 使用共享ID3D11设备的多线程环境中的D2D1和D3D11互操作性问题

在D2D下，我使用ID2D1RenderTarget对象在单独的线程中绘制线和图像，甚至渲染到同一线程中的另一个ID2D1RenderTarget对象，它总是可以正常工作

<>但在需要支持多线程D3/Media基金会的情况下，我使用了全局ID3D3D11设备，并进行了D2D/D3D互操作。p> 如果只运行一个线程，它工作得很好；bug如果同时运行两个线程（每个线程都有一个CDxRender窗口），则会报告一个错误，我不知道如何解决：

D2D DEBUG ERROR - An attempt to draw to an inaccessible target has been detected.

出现MFVerifDemo.exe调试断点

Then press F5, continue to run:

D3D11 ERROR: ID3D11DeviceContext::Draw: A Vertex Shader is always required when drawing, but none is currently bound. [ EXECUTION ERROR #341: DEVICE_DRAW_VERTEX_SHADER_NOT_SET]
D3D11 ERROR: ID3D11DeviceContext::Draw: Rasterization Unit is enabled (PixelShader is not NULL or Depth/Stencil test is enabled and RasterizedStream is not D3D11_SO_NO_RASTERIZED_STREAM) but position is not provided by the last shader before the Rasterization Unit. [ EXECUTION ERROR #362: DEVICE_DRAW_POSITION_NOT_PRESENT]
D3D11: Removing Device.

1，使用d3d11createdevice创建全局变量_d3d11_device，并打包executecommandlist：

CComPtr<id3d11device>  _d3d11_device

HRESULT CreateD3DDevice(ID3D11Device** d3d11_device)
{
    CComPtr<ID3D11DeviceContext> d3d11_immedContex;

    //Describe our Buffer
    DXGI_MODE_DESC bufferDesc;
    ZeroMemory(&bufferDesc, sizeof(DXGI_MODE_DESC));
    bufferDesc.Width = 0;
    bufferDesc.Height = 0;
    bufferDesc.RefreshRate.Numerator = 60;
    bufferDesc.RefreshRate.Denominator = 1;
    bufferDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
    bufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
    bufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;

    //Create our _swap_chain1   
    HRESULT hr = D3D11CreateDevice(NULL, D3D_DRIVER_TYPE_HARDWARE , NULL, D3D11_CREATE_DEVICE_DEBUG | D3D11_CREATE_DEVICE_BGRA_SUPPORT, NULL, NULL, D3D11_SDK_VERSION, d3d11_device, NULL, &d3d11_immedContex);
    RETURN_ON_FAIL(hr);

    CComPtr<ID3D11Multithread> D3DDevMT;
    hr = (*d3d11_device)->QueryInterface(IID_PPV_ARGS(&D3DDevMT));
    RETURN_ON_FAIL(hr);
    D3DDevMT->SetMultithreadProtected(TRUE);

    return hr;
}
void ExecuteCommandList(CComPtr<ID3D11DeviceContext>    deferred_context)
{
    CComPtr<ID3D11CommandList> command_list;
    HRESULT hr = deferred_context->FinishCommandList(FALSE, &command_list);
    RETURN_ON_FAIL2(hr);

    CComPtr<ID3D11DeviceContext> immediate_context;
    _d3d11_device->GetImmediateContext(&immediate_context);

    if (immediate_context)
    {
        std::unique_lock <std::mutex> lck(_mutex);
        immediate_context->ExecuteCommandList(command_list, FALSE);
    }
}

5，VertexShader.hlsl：

struct PS_Input
{
    float4 pos:SV_POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

Texture2D objTexture :register(t0);
SamplerState objSamplerState;

float4 main(PS_Input input) : SV_TARGET
{
    /*float4 retColor = 0;
    retColor = objTexture.Sample(objSamplerState, input.texCoord) * input.color;
    clip(retColor.a - 0.3);
    return retColor;*/
    return input.color;
}

struct VS_Input
{
    float4 pos:POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

struct VS_Output
{
    float4 pos:SV_POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

VS_Output main(VS_Input input)
{
    VS_Output output;
    output.pos = input.pos;/*mul(input.pos, WVP);*/
    output.color = input.color;
    output.texCoord = input.texCoord;
    return output;
}

---

我看不到在代码中使用

ID3D11多线程。是否启用多线程操作保护？是的，创建ID3D11Device，然后查询ID3D11Multithread并设置MultithreadProtected（TRUE）。解决方案是通过idxgikeyedmutex共享，D2D和D3D在单个线程中互操作。实际上需要不需要全局和跨线程共享的ID3D11设备，我看不到在代码中使用
ID3D11多线程。是否启用多线程操作保护？是的，创建ID3D11Device，然后查询ID3D11Multithread并设置MultithreadProtected（TRUE）。解决方案是通过idxgikeyedmutex共享，D2D和D3D在单个线程中互操作。实际上需要不需要全局和跨线程共享的ID3D11设备
struct PS_Input
{
    float4 pos:SV_POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

Texture2D objTexture :register(t0);
SamplerState objSamplerState;

float4 main(PS_Input input) : SV_TARGET
{
    /*float4 retColor = 0;
    retColor = objTexture.Sample(objSamplerState, input.texCoord) * input.color;
    clip(retColor.a - 0.3);
    return retColor;*/
    return input.color;
}

struct VS_Input
{
    float4 pos:POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

struct VS_Output
{
    float4 pos:SV_POSITION;
    float4 color:COLOR;
    float2 texCoord:TEXCOORD;
};

VS_Output main(VS_Input input)
{
    VS_Output output;
    output.pos = input.pos;/*mul(input.pos, WVP);*/
    output.color = input.color;
    output.texCoord = input.texCoord;
    return output;
}