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

   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

   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

   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

   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

   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

   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

Author

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