Direct3D 11 Interoperability

enum cudaD3D11DeviceList

CUDA devices corresponding to a D3D11 device

Enumerator:

cudaD3D11DeviceListAll

The CUDA devices for all GPUs used by a D3D11 device

cudaD3D11DeviceListCurrentFrame

The CUDA devices for the GPUs used by a D3D11 device in its currently rendering frame

cudaD3D11DeviceListNextFrame

The CUDA devices for the GPUs to be used by a D3D11 device in the next frame

cudaError_t cudaD3D11GetDevice (int * device, IDXGIAdapter * pAdapter)

Returns in *device the CUDA-compatible device corresponding to the adapter pAdapter obtained from IDXGIFactory::EnumAdapters. This call will succeed only if a device on adapter pAdapter is CUDA-compatible.

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cudaError_t cudaD3D11GetDevices (unsigned int * pCudaDeviceCount, int * pCudaDevices, unsigned int cudaDeviceCount, ID3D11Device * pD3D11Device, enum cudaD3D11DeviceList deviceList)

Returns in *pCudaDeviceCount the number of CUDA-compatible devices corresponding to the Direct3D 11 device pD3D11Device. Also returns in *pCudaDevices at most cudaDeviceCount of the the CUDA-compatible devices corresponding to the Direct3D 11 device pD3D11Device.

If any of the GPUs being used to render pDevice are not CUDA capable then the call will return cudaErrorNoDevice.

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cudaError_t cudaGraphicsD3D11RegisterResource (struct cudaGraphicsResource ** resource, ID3D11Resource * pD3DResource, unsigned int flags)

Registers the Direct3D 11 resource pD3DResource for access by CUDA.

If this call is successful, then the application will be able to map and unmap this resource until it is unregistered through cudaGraphicsUnregisterResource(). Also on success, this call will increase the internal reference count on pD3DResource. This reference count will be decremented when this resource is unregistered through cudaGraphicsUnregisterResource().

This call potentially has a high-overhead and should not be called every frame in interactive applications.

The type of pD3DResource must be one of the following.

• ID3D11Buffer: may be accessed via a device pointer
• ID3D11Texture1D: individual subresources of the texture may be accessed via arrays
• ID3D11Texture2D: individual subresources of the texture may be accessed via arrays
• ID3D11Texture3D: individual subresources of the texture may be accessed via arrays

The flags argument may be used to specify additional parameters at register time. The valid values for this parameter are

• cudaGraphicsRegisterFlagsNone: Specifies no hints about how this resource will be used.
• cudaGraphicsRegisterFlagsSurfaceLoadStore: Specifies that CUDA will bind this resource to a surface reference.
• cudaGraphicsRegisterFlagsTextureGather: Specifies that CUDA will perform texture gather operations on this resource.

Not all Direct3D resources of the above types may be used for interoperability with CUDA. The following are some limitations.

• The primary rendertarget may not be registered with CUDA.
• Textures which are not of a format which is 1, 2, or 4 channels of 8, 16, or 32-bit integer or floating-point data cannot be shared.
• Surfaces of depth or stencil formats cannot be shared.

A complete list of supported DXGI formats is as follows. For compactness the notation A_{B,C,D} represents A_B, A_C, and A_D.

• DXGI_FORMAT_A8_UNORM
• DXGI_FORMAT_B8G8R8A8_UNORM
• DXGI_FORMAT_B8G8R8X8_UNORM
• DXGI_FORMAT_R16_FLOAT
• DXGI_FORMAT_R16G16B16A16_{FLOAT,SINT,SNORM,UINT,UNORM}
• DXGI_FORMAT_R16G16_{FLOAT,SINT,SNORM,UINT,UNORM}
• DXGI_FORMAT_R16_{SINT,SNORM,UINT,UNORM}
• DXGI_FORMAT_R32_FLOAT
• DXGI_FORMAT_R32G32B32A32_{FLOAT,SINT,UINT}
• DXGI_FORMAT_R32G32_{FLOAT,SINT,UINT}
• DXGI_FORMAT_R32_{SINT,UINT}
• DXGI_FORMAT_R8G8B8A8_{SINT,SNORM,UINT,UNORM,UNORM_SRGB}
• DXGI_FORMAT_R8G8_{SINT,SNORM,UINT,UNORM}
• DXGI_FORMAT_R8_{SINT,SNORM,UINT,UNORM}

If pD3DResource is of incorrect type or is already registered, then cudaErrorInvalidResourceHandle is returned. If pD3DResource cannot be registered, then cudaErrorUnknown is returned.

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