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This section describes the Direct3D 11 interoperability functions of the CUDA runtime application programming interface. Note that mapping of Direct3D 11 resources is performed with the graphics API agnostic, resource mapping interface described inGraphics Interopability.

Enumerations

enum cudaD3D11DeviceList

CUDA devices corresponding to a D3D11 device

Values

cudaD3D11DeviceListAll =1

The CUDA devices for all GPUs used by a D3D11 device

cudaD3D11DeviceListCurrentFrame =2

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

cudaD3D11DeviceListNextFrame =3

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

Functions

__host__ ​cudaError_t cudaD3D11GetDevice ( int* device, IDXGIAdapter* pAdapter )

Gets the device number for an adapter.

Parameters

device

- Returns the device corresponding to pAdapter

pAdapter

- D3D11 adapter to get device for

Returns

cudaSuccess,cudaErrorInvalidValue,cudaErrorUnknown

Description

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

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaGraphicsUnregisterResource,cudaGraphicsMapResources,cudaGraphicsSubResourceGetMappedArray,cudaGraphicsResourceGetMappedPointer,cuD3D11GetDevice

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

Gets the CUDA devices corresponding to a Direct3D 11 device.

Parameters

pCudaDeviceCount

- Returned number of CUDA devices corresponding topD3D11Device

pCudaDevices

- Returned CUDA devices corresponding topD3D11Device

cudaDeviceCount

- The size of the output device arraypCudaDevices

pD3D11Device

- Direct3D 11 device to query for CUDA devices

deviceList

- The set of devices to return. This set may becudaD3D11DeviceListAll for all devices,cudaD3D11DeviceListCurrentFrame for the devices used to render the current frame (in SLI), orcudaD3D11DeviceListNextFrame for the devices used to render the next frame (in SLI).

Returns

cudaSuccess,cudaErrorNoDevice,cudaErrorUnknown

Description

Returns in*pCudaDeviceCount the number of CUDA-compatible devices corresponding to the Direct3D 11 devicepD3D11Device. Also returns in*pCudaDevices at mostcudaDeviceCount of the the CUDA-compatible devices corresponding to the Direct3D 11 devicepD3D11Device.

If any of the GPUs being used to renderpDevice are not CUDA capable then the call will returncudaErrorNoDevice.

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaGraphicsUnregisterResource,cudaGraphicsMapResources,cudaGraphicsSubResourceGetMappedArray,cudaGraphicsResourceGetMappedPointer,cuD3D11GetDevices

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

Register a Direct3D 11 resource for access by CUDA.

Parameters

resource

- Pointer to returned resource handle

pD3DResource

- Direct3D resource to register

flags

- Parameters for resource registration

Returns

cudaSuccess,cudaErrorInvalidDevice,cudaErrorInvalidValue,cudaErrorInvalidResourceHandle,cudaErrorUnknown

Description

Registers the Direct3D 11 resourcepD3DResource 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 throughcudaGraphicsUnregisterResource(). Also on success, this call will increase the internal reference count onpD3DResource. This reference count will be decremented when this resource is unregistered throughcudaGraphicsUnregisterResource().

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

The type ofpD3DResource 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

Theflags 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}

IfpD3DResource is of incorrect type or is already registered, thencudaErrorInvalidResourceHandle is returned. IfpD3DResource cannot be registered, thencudaErrorUnknown is returned.

Note:

Note that this function may also return error codes from previous, asynchronous launches.

See also:

cudaGraphicsUnregisterResource,cudaGraphicsMapResources,cudaGraphicsSubResourceGetMappedArray,cudaGraphicsResourceGetMappedPointer,cuGraphicsD3D11RegisterResource