clCreateFromD3D10BufferKHR

Creates an OpenCL buffer object from a Direct3D 10 buffer.

cl_mem clCreateFromD3D10BufferKHR ( cl_context context,
  cl_mem_flags flags,
  ID3D10Buffer *resource,
  cl_int  *errcode_ret )

Parameters

context

A valid OpenCL context created from a Direct3D 10 device.

flags

A bit-field that is used to specify usage information. May be CL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY, or CL_MEM_READ_WRITE. (See the table for clCreateBuffer for more information.)

resource

A pointer to the Direct3D 10 buffer to share.

errcode_ret

An appropriate error code. If errcode_ret is NULL, no error code is returned.

Notes

The size of the returned OpenCL buffer object is the same as the size of resource. This call will increment the internal Direct3D reference count on resource. The internal Direct3D reference count on resource will be decremented when the OpenCL reference count on the returned OpenCL memory object drops to zero.

General information about sharing memory objects with Direct3D 10 follows.

The goal of this extension is to provide interoperability between OpenCL and Direct3D 10. This is designed to function analogously to the OpenGL interoperability as defined in sections 9.7 and 9.8. If this extension is supported by an implementation, the string "cl_khr_d3d10_sharing" will be present in the CL_PLATFORM_EXTENSIONS (see clGetPlatformInfo) or CL_DEVICE_EXTENSIONS (see clGetDeviceInfo).

As currently proposed the interfaces for this extension would be provided in cl_d3d10.h.

The OpenCL functions enabled by the cl_khr_d3d10_sharing extension allow applications to use Direct3D 10 resources as OpenCL memory objects. This allows efficient sharing of data between OpenCL and Direct3D 10. The OpenCL API may be used to execute kernels that read and/or write memory objects that are also Direct3D 10 resources. An OpenCL image object may be created from a Direct3D 10 texture resource. An OpenCL buffer object may be created from a Direct3D 10 buffer resource. OpenCL memory objects may be created from Direct3D 10 objects if and only if the OpenCL context has been created from a Direct3D 10 device.

Lifetime of Shared [D3D10] Objects

An OpenCL memory object created from a Direct3D 10 resource remains valid as long as the corresponding Direct3D 10 resource has not been deleted. If the Direct3D 10 resource is deleted through the Direct3D 10 API, subsequent use of the OpenCL memory object will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination.

The successful creation of a cl_context against a Direct3D 10 device specified via the context create parameter CL_CONTEXT_D3D10_DEVICE_KHR will increment the internal Direct3D reference count on the specified Direct3D 10 device. The internal Direct3D reference count on that Direct3D 10 device will be decremented when the OpenCL reference count on the returned OpenCL context drops to zero.

The OpenCL context and corresponding command-queues are dependent on the existence of the Direct3D 10 device from which the OpenCL context was created. If the Direct3D 10 device is deleted through the Direct3D 10 API, subsequent use of the OpenCL context will result in undefined behavior, including but not limited to possible OpenCL errors, data corruption, and program termination.

Errors

Returns a valid non-zero OpenCL buffer object and errcode_ret is set to CL_SUCCESS if the buffer object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in errcode_ret:

  • CL_INVALID_CONTEXT if context is not a valid context.
  • CL_INVALID_VALUE if values specified in flags are not valid.
  • CL_INVALID_D3D10_RESOURCE_KHR if resource is not a Direct3D 10 buffer resource, if resource was created with the D3D10_USAGE flag D3D10_USAGE_IMMUTABLE, if a cl_mem from resource has already been created using clCreateFromD3D10BufferKHR, or if context was not created against the same Direct3D 10 device from which resource was created.
  • CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

Specification

OpenCL Specification

Also see

cl_khr_d3d10_sharing

Copyright © 2007-2013 The Khronos Group Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.