NAME

       Graphics Interoperability -

   Functions
       cudaError_t cudaGraphicsMapResources (int count, cudaGraphicsResource_t *resources, cudaStream_t
           stream=0)
           Map graphics resources for access by CUDA.
       cudaError_t cudaGraphicsResourceGetMappedMipmappedArray (cudaMipmappedArray_t *mipmappedArray,
           cudaGraphicsResource_t resource)
           Get a mipmapped array through which to access a mapped graphics resource.
       cudaError_t cudaGraphicsResourceGetMappedPointer (void **devPtr, size_t *size, cudaGraphicsResource_t
           resource)
           Get an device pointer through which to access a mapped graphics resource.
       cudaError_t cudaGraphicsResourceSetMapFlags (cudaGraphicsResource_t resource, unsigned int flags)
           Set usage flags for mapping a graphics resource.
       cudaError_t cudaGraphicsSubResourceGetMappedArray (cudaArray_t *array, cudaGraphicsResource_t resource,
           unsigned int arrayIndex, unsigned int mipLevel)
           Get an array through which to access a subresource of a mapped graphics resource.
       cudaError_t cudaGraphicsUnmapResources (int count, cudaGraphicsResource_t *resources, cudaStream_t
           stream=0)
           Unmap graphics resources.
       cudaError_t cudaGraphicsUnregisterResource (cudaGraphicsResource_t resource)
           Unregisters a graphics resource for access by CUDA.

Detailed Description

       \brief graphics interoperability functions of the CUDA runtime API (cuda_runtime_api.h)

       This section describes the graphics interoperability functions of the CUDA runtime application
       programming interface.

Function Documentation

   cudaError_t cudaGraphicsMapResources (int count, cudaGraphicsResource_t * resources, cudaStream_t stream = 0)
       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
       cudaGraphicsMapResources() will complete before any subsequent CUDA work issued in stream begins.

       If resources contains any duplicate entries then cudaErrorInvalidResourceHandle is returned. If any of
       resources are presently mapped for access by CUDA then cudaErrorUnknown is returned.

       Parameters:
           count - Number of resources to map
           resources - Resources to map for CUDA
           stream - Stream for synchronization

       Returns:
           cudaSuccess, cudaErrorInvalidResourceHandle, cudaErrorUnknown

       Note:
           This function uses standard  semantics.

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

       See also:
           cudaGraphicsResourceGetMappedPointer, cudaGraphicsSubResourceGetMappedArray,
           cudaGraphicsUnmapResources, cuGraphicsMapResources

   cudaError_t cudaGraphicsResourceGetMappedMipmappedArray (cudaMipmappedArray_t * mipmappedArray,
       cudaGraphicsResource_t resource)
       Returns in *mipmappedArray a mipmapped array through which the mapped graphics resource resource may be
       accessed. The value set in mipmappedArray may change every time that resource is mapped.

       If resource is not a texture then it cannot be accessed via an array and cudaErrorUnknown is returned. If
       resource is not mapped then cudaErrorUnknown is returned.

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

       Returns:
           cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidResourceHandle, cudaErrorUnknown

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

       See also:
           cudaGraphicsResourceGetMappedPointer, cuGraphicsResourceGetMappedMipmappedArray

   cudaError_t cudaGraphicsResourceGetMappedPointer (void ** devPtr, size_t * size, cudaGraphicsResource_t
       resource)
       Returns in *devPtr a pointer through which the mapped graphics resource resource may be accessed. Returns
       in *size the size of the memory in bytes which may be accessed from that pointer. The value set in devPtr
       may change every time that resource is mapped.

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

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

       Returns:
           cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidResourceHandle, cudaErrorUnknown

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

       See also:
           cudaGraphicsMapResources, cudaGraphicsSubResourceGetMappedArray, cuGraphicsResourceGetMappedPointer

   cudaError_t cudaGraphicsResourceSetMapFlags (cudaGraphicsResource_t 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:

       • cudaGraphicsMapFlagsNone: Specifies no hints about how resource will be used. It is therefore assumed
         that CUDA may read from or write to resource.

       • cudaGraphicsMapFlagsReadOnly: Specifies that CUDA will not write to resource.

       • cudaGraphicsMapFlagsWriteDiscard: Specifies CUDA will not read from resource and will write over the
         entire contents of resource, so none of the data previously stored in resource will be preserved.

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

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

       Returns:
           cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidResourceHandle, cudaErrorUnknown,

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

       See also:
           cudaGraphicsMapResources, cuGraphicsResourceSetMapFlags

   cudaError_t cudaGraphicsSubResourceGetMappedArray (cudaArray_t * array, cudaGraphicsResource_t resource,
       unsigned int arrayIndex, unsigned int mipLevel)
       Returns in *array 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 array
       may change every time that resource is mapped.

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

       Parameters:
           array - 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 cudaGraphicsCubeFace
           for cubemap textures for the subresource to access
           mipLevel - Mipmap level for the subresource to access

       Returns:
           cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidResourceHandle, cudaErrorUnknown

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

       See also:
           cudaGraphicsResourceGetMappedPointer, cuGraphicsSubResourceGetMappedArray

   cudaError_t cudaGraphicsUnmapResources (int count, cudaGraphicsResource_t * resources, cudaStream_t stream =
       0)
       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
       cudaGraphicsUnmapResources() will complete before any subsequently issued graphics work begins.

       If resources contains any duplicate entries then cudaErrorInvalidResourceHandle is returned. If any of
       resources are not presently mapped for access by CUDA then cudaErrorUnknown is returned.

       Parameters:
           count - Number of resources to unmap
           resources - Resources to unmap
           stream - Stream for synchronization

       Returns:
           cudaSuccess, cudaErrorInvalidResourceHandle, cudaErrorUnknown

       Note:
           This function uses standard  semantics.

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

       See also:
           cudaGraphicsMapResources, cuGraphicsUnmapResources

   cudaError_t cudaGraphicsUnregisterResource (cudaGraphicsResource_t resource)
       Unregisters the graphics resource resource so it is not accessible by CUDA unless registered again.

       If resource is invalid then cudaErrorInvalidResourceHandle is returned.

       Parameters:
           resource - Resource to unregister

       Returns:
           cudaSuccess, cudaErrorInvalidResourceHandle, cudaErrorUnknown

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

       See also:
           cudaGraphicsD3D9RegisterResource, cudaGraphicsD3D10RegisterResource,
           cudaGraphicsD3D11RegisterResource, cudaGraphicsGLRegisterBuffer, cudaGraphicsGLRegisterImage,
           cuGraphicsUnregisterResource

Author

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