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rpsathe

CompuateShaders and Swap Chain for Present()

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Hello,
First the context:
I am trying to profile a Compute Shader app ComputeShaderSort11 using Perf Studio 2.0. To be able to use Perf Studio 2.0 - I need to have an infinite loop with a Present() called on a Swap Chain.

Questions -

What does swap-chain for a compute device mean?

If I try to initialize the swap chain with following desc. and pass that to D3D11CreateDeviceAndSwapChain, the D3D11CreateDeviceAndSwapChain call fails.

// Populate the Swap chain desc.
void SetSwapChainDesc( DXGI_SWAP_CHAIN_DESC &swapChainDesc )
{
ZeroMemory(&swapChainDesc, sizeof(swapChainDesc));
//set buffer dimensions and format
swapChainDesc.BufferCount = 2;
swapChainDesc.BufferDesc.Width = 1;
swapChainDesc.BufferDesc.Height = 1;
swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT/*DXGI_USAGE_UNORDERED_ACCESS*/;
swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM/*DXGI_FORMAT_UNKNOWN*/;

//set refresh rate
swapChainDesc.BufferDesc.RefreshRate.Numerator = 60;
swapChainDesc.BufferDesc.RefreshRate.Denominator = 1;

//sampling settings
swapChainDesc.SampleDesc.Quality = 0;
swapChainDesc.SampleDesc.Count = 1;
//output window handle
swapChainDesc.OutputWindow = NULL;
swapChainDesc.Windowed = false;
}


As you can see in the commented part of the above code, I did try setting fields that I thought were appropriate for compute shader, but my D3D11CreateDeviceAndSwapChain still fails.

Any pointers on how to fix this?

Thanks

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Like the docs say...

OutputWindow
HWND

An HWND handle to the output window. This member must not be NULL.


The whole point of a swap chain is to manage a queue of buffers used for taking your final rendered output and copying it to a window. So it doesn't make any sense to have a swap chain without a window to bind it to.

You can just create a window as initially hidden and never show it, if you don't actually want to display anything.

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