NAME

       Graphics Interoperability -

   Functions
       CUresult cuGraphicsMapResources (unsigned int count, CUgraphicsResource *resources, CUstream hStream)
           Map graphics resources for access by CUDA.
       CUresult cuGraphicsResourceGetMappedMipmappedArray (CUmipmappedArray *pMipmappedArray, CUgraphicsResource
           resource)
           Get a mipmapped array through which to access a mapped graphics resource.
       CUresult cuGraphicsResourceGetMappedPointer (CUdeviceptr *pDevPtr, size_t *pSize, CUgraphicsResource
           resource)
           Get a device pointer through which to access a mapped graphics resource.
       CUresult cuGraphicsResourceSetMapFlags (CUgraphicsResource resource, unsigned int flags)
           Set usage flags for mapping a graphics resource.
       CUresult cuGraphicsSubResourceGetMappedArray (CUarray *pArray, CUgraphicsResource resource, unsigned int
           arrayIndex, unsigned int mipLevel)
           Get an array through which to access a subresource of a mapped graphics resource.
       CUresult cuGraphicsUnmapResources (unsigned int count, CUgraphicsResource *resources, CUstream hStream)
           Unmap graphics resources.
       CUresult cuGraphicsUnregisterResource (CUgraphicsResource resource)
           Unregisters a graphics resource for access by CUDA.

Detailed Description

       \brief graphics interoperability functions of the low-level CUDA driver API (cuda.h)

       This section describes the graphics interoperability functions of the low-level CUDA driver application
       programming interface.

Function Documentation

   CUresult cuGraphicsMapResources (unsigned int count, CUgraphicsResource * resources, CUstream hStream)
       Maps the count graphics resources in resources for access by CUDA.

       The resources in resources may be accessed by CUDA until they are unmapped. The graphics API from which
       resources were registered should not access any resources while they are mapped by CUDA. If an
       application does so, the results are undefined.

       This function provides the synchronization guarantee that any graphics calls issued before
       cuGraphicsMapResources() will complete before any subsequent CUDA work issued in stream begins.

       If resources includes any duplicate entries then CUDA_ERROR_INVALID_HANDLE is returned. If any of
       resources are presently mapped for access by CUDA then CUDA_ERROR_ALREADY_MAPPED is returned.

       Parameters:
           count - Number of resources to map
           resources - Resources to map for CUDA usage
           hStream - Stream with which to synchronize

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_ALREADY_MAPPED, CUDA_ERROR_UNKNOWN

       Note:
           This function uses standard  semantics.

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

       See also:
           cuGraphicsResourceGetMappedPointer, cuGraphicsSubResourceGetMappedArray, cuGraphicsUnmapResources,
           cudaGraphicsMapResources

   CUresult cuGraphicsResourceGetMappedMipmappedArray (CUmipmappedArray * pMipmappedArray, CUgraphicsResource
       resource)
       Returns in *pMipmappedArray a mipmapped array through which the mapped graphics resource resource. The
       value set in *pMipmappedArray may change every time that resource is mapped.

       If resource is not a texture then it cannot be accessed via a mipmapped array and
       CUDA_ERROR_NOT_MAPPED_AS_ARRAY is returned. If resource is not mapped then CUDA_ERROR_NOT_MAPPED is
       returned.

       Parameters:
           pMipmappedArray - Returned mipmapped array through which resource may be accessed
           resource - Mapped resource to access

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_VALUE, CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_NOT_MAPPED,
           CUDA_ERROR_NOT_MAPPED_AS_ARRAY

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

       See also:
           cuGraphicsResourceGetMappedPointer, cudaGraphicsResourceGetMappedMipmappedArray

   CUresult cuGraphicsResourceGetMappedPointer (CUdeviceptr * pDevPtr, size_t * pSize, CUgraphicsResource
       resource)
       Returns in *pDevPtr a pointer through which the mapped graphics resource resource may be accessed.
       Returns in pSize the size of the memory in bytes which may be accessed from that pointer. The value set
       in pPointer may change every time that resource is mapped.

       If resource is not a buffer then it cannot be accessed via a pointer and CUDA_ERROR_NOT_MAPPED_AS_POINTER
       is returned. If resource is not mapped then CUDA_ERROR_NOT_MAPPED is returned. *

       Parameters:
           pDevPtr - Returned pointer through which resource may be accessed
           pSize - Returned size of the buffer accessible starting at *pPointer
           resource - Mapped resource to access

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_VALUE, CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_NOT_MAPPED,
           CUDA_ERROR_NOT_MAPPED_AS_POINTER

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

       See also:
           cuGraphicsMapResources, cuGraphicsSubResourceGetMappedArray, cudaGraphicsResourceGetMappedPointer

   CUresult cuGraphicsResourceSetMapFlags (CUgraphicsResource resource, unsigned int flags)
       Set flags for mapping the graphics resource resource.

       Changes to flags will take effect the next time resource is mapped. The flags argument may be any of the
       following:

       • CU_GRAPHICS_MAP_RESOURCE_FLAGS_NONE: Specifies no hints about how this resource will be used. It is
         therefore assumed that this resource will be read from and written to by CUDA kernels. This is the
         default value.

       • CU_GRAPHICS_MAP_RESOURCE_FLAGS_READONLY: Specifies that CUDA kernels which access this resource will
         not write to this resource.

       • CU_GRAPHICS_MAP_RESOURCE_FLAGS_WRITEDISCARD: Specifies that CUDA kernels which access this resource
         will not read from this resource and will write over the entire contents of the resource, so none of
         the data previously stored in the resource will be preserved.

       If resource is presently mapped for access by CUDA then CUDA_ERROR_ALREADY_MAPPED is returned. If flags
       is not one of the above values then CUDA_ERROR_INVALID_VALUE is returned.

       Parameters:
           resource - Registered resource to set flags for
           flags - Parameters for resource mapping

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_VALUE, CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_ALREADY_MAPPED

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

       See also:
           cuGraphicsMapResources, cudaGraphicsResourceSetMapFlags

   CUresult cuGraphicsSubResourceGetMappedArray (CUarray * pArray, CUgraphicsResource resource, unsigned int
       arrayIndex, unsigned int mipLevel)
       Returns in *pArray an array through which the subresource of the mapped graphics resource resource which
       corresponds to array index arrayIndex and mipmap level mipLevel may be accessed. The value set in *pArray
       may change every time that resource is mapped.

       If resource is not a texture then it cannot be accessed via an array and CUDA_ERROR_NOT_MAPPED_AS_ARRAY
       is returned. If arrayIndex is not a valid array index for resource then CUDA_ERROR_INVALID_VALUE is
       returned. If mipLevel is not a valid mipmap level for resource then CUDA_ERROR_INVALID_VALUE is returned.
       If resource is not mapped then CUDA_ERROR_NOT_MAPPED is returned.

       Parameters:
           pArray - Returned array through which a subresource of resource may be accessed
           resource - Mapped resource to access
           arrayIndex - Array index for array textures or cubemap face index as defined by CUarray_cubemap_face
           for cubemap textures for the subresource to access
           mipLevel - Mipmap level for the subresource to access

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_VALUE, CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_NOT_MAPPED,
           CUDA_ERROR_NOT_MAPPED_AS_ARRAY

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

       See also:
           cuGraphicsResourceGetMappedPointer, cudaGraphicsSubResourceGetMappedArray

   CUresult cuGraphicsUnmapResources (unsigned int count, CUgraphicsResource * resources, CUstream hStream)
       Unmaps the count graphics resources in resources.

       Once unmapped, the resources in resources may not be accessed by CUDA until they are mapped again.

       This function provides the synchronization guarantee that any CUDA work issued in stream before
       cuGraphicsUnmapResources() will complete before any subsequently issued graphics work begins.

       If resources includes any duplicate entries then CUDA_ERROR_INVALID_HANDLE is returned. If any of
       resources are not presently mapped for access by CUDA then CUDA_ERROR_NOT_MAPPED is returned.

       Parameters:
           count - Number of resources to unmap
           resources - Resources to unmap
           hStream - Stream with which to synchronize

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_NOT_MAPPED, CUDA_ERROR_UNKNOWN

       Note:
           This function uses standard  semantics.

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

       See also:
           cuGraphicsMapResources, cudaGraphicsUnmapResources

   CUresult cuGraphicsUnregisterResource (CUgraphicsResource resource)
       Unregisters the graphics resource resource so it is not accessible by CUDA unless registered again.

       If resource is invalid then CUDA_ERROR_INVALID_HANDLE is returned.

       Parameters:
           resource - Resource to unregister

       Returns:
           CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED, CUDA_ERROR_INVALID_CONTEXT,
           CUDA_ERROR_INVALID_HANDLE, CUDA_ERROR_UNKNOWN

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

       See also:
           cuGraphicsD3D9RegisterResource, cuGraphicsD3D10RegisterResource, cuGraphicsD3D11RegisterResource,
           cuGraphicsGLRegisterBuffer, cuGraphicsGLRegisterImage, cudaGraphicsUnregisterResource

Author

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