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NAME
clGetMemObjectInfo - Get information that is common to all memory objects (buffer and image objects).
cl_int clGetMemObjectInfo(cl_mem memobj, cl_mem_info param_name, size_t param_value_size,
void *param_value, size_t *param_value_size_ret);
PARAMETERS
memobj
Specifies the memory object being queried.
param_name
Specifies the information to query. The list of supported param_name types and the information
returned in param_value by clGetMemObjectInfo is described in the table below.
┌──────────────────────────┬───────────────────────────┬──────────────────────────────────────┐
│cl_mem_info │ Return Type │ Info. returned in │
│ │ │ param_value │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_TYPE │ cl_mem_object_type │ Returns one of the following │
│ │ │ values: │
│ │ │ │
│ │ │ CL_MEM_OBJECT_BUFFER if │
│ │ │ memobj is created with │
│ │ │ clCreateBuffer(3clc) or │
│ │ │ clCreateSubBuffer(3clc). │
│ │ │ │
│ │ │ cl_image_desc.image_type │
│ │ │ argument value if memobj is │
│ │ │ created with │
│ │ │ clCreateImage(3clc). │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_FLAGS │ cl_mem_flags │ Returns the flags argument │
│ │ │ value specified when memobj │
│ │ │ is created with │
│ │ │ clCreateBuffer(3clc), │
│ │ │ clCreateSubBuffer(3clc), or │
│ │ │ clCreateImage(3clc). If │
│ │ │ memobj is a sub-buffer the │
│ │ │ memory access qualifiers │
│ │ │ inherited from parent buffer │
│ │ │ is also returned │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_SIZE │ size_t │ Return actual size of the │
│ │ │ data store associated with │
│ │ │ memobj in bytes. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_HOST_PTR │ void * │ If memobj is created with │
│ │ │ clCreateBuffer(3clc) or │
│ │ │ clCreateImage(3clc) and │
│ │ │ CL_MEM_USE_HOST_PTR is │
│ │ │ specified in mem_flags, │
│ │ │ return the host_ptr argument │
│ │ │ value specified when memobj │
│ │ │ is created. Otherwise a NULL │
│ │ │ value is returned. │
│ │ │ │
│ │ │ If memobj is created with │
│ │ │ clCreateSubBuffer(3clc), │
│ │ │ return the host_ptr + origin │
│ │ │ value specified when memobj │
│ │ │ is created. host_ptr is the │
│ │ │ argument value specified to │
│ │ │ clCreateBuffer(3clc) and │
│ │ │ CL_MEM_USE_HOST_PTR is │
│ │ │ specified in mem_flags for │
│ │ │ memory object from which │
│ │ │ memobj is created. Otherwise │
│ │ │ a NULL value is returned. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_MAP_COUNT │ cl_uint │ Map count. The map count │
│ │ │ returned should be │
│ │ │ considered immediately │
│ │ │ stale. It is unsuitable for │
│ │ │ general use in applications. │
│ │ │ This feature is provided for │
│ │ │ debugging. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_REFERENCE_COUNT │ cl_uint │ Return memobj reference │
│ │ │ count. The reference count │
│ │ │ returned should be │
│ │ │ considered immediately │
│ │ │ stale. It is unsuitable for │
│ │ │ general use in applications. │
│ │ │ This feature is provided for │
│ │ │ identifying memory leaks. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_CONTEXT │ cl_context │ Return context specified │
│ │ │ when memory object is │
│ │ │ created. If memobj is │
│ │ │ created using │
│ │ │ clCreateSubBuffer(3clc), the │
│ │ │ context associated with the │
│ │ │ memory object specified as │
│ │ │ the buffer argument to │
│ │ │ clCreateSubBuffer(3clc) is │
│ │ │ returned. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_ASSOCIATED_- │ cl_mem │ Return memory object from │
│MEMOBJECT │ │ which memobj is created. │
│ │ │ │
│ │ │ This returns the memory │
│ │ │ object specified as buffer │
│ │ │ argument to │
│ │ │ clCreateSubBuffer(3clc). │
│ │ │ │
│ │ │ Otherwise a NULL value is │
│ │ │ returned. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_OFFSET │ size_t │ Return offset if memobj is a │
│ │ │ sub-buffer object created │
│ │ │ using │
│ │ │ clCreateSubBuffer(3clc). │
│ │ │ │
│ │ │ This returns 0 if memobj is │
│ │ │ not a subbuffer object. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_D3D10_RESOURCE_KHR │ ID3D10Resource * │ The property being queried │
│ │ │ (if the │
│ │ │ cl_khr_d3d10_sharing(3clc) │
│ │ │ extension is enabled). If │
│ │ │ memobj was created using │
│ │ │ clCreateFromD3D10BufferKHR(3clc), │
│ │ │ clCreateFromD3D10Texture2DKHR(3clc), │
│ │ │ or │
│ │ │ clCreateFromD3D10Texture3DKHR(3clc), │
│ │ │ returns the resource │
│ │ │ argument specified when │
│ │ │ memobj was created. │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_DX9_MEDIA_- │ cl_dx9_media_- │ Returns the │
│ADAPTER_TYPE_KHR │ adapter_type_khr │ cl_dx9_media_adapter_type_khr │
│ │ │ argument value specified when memobj │
│ │ │ is created using │
│ │ │ clCreateFromDX9MediaSurfaceKHR(3clc) │
│ │ │ (If the │
│ │ │ cl_khr_dx9_media_sharing(3clc) │
│ │ │ extension is supported) │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_DX9_MEDIA_- │ cl_dx9_- surface_info_khr │ Returns the cl_dx9_surface_info_khr │
│SURFACE_INFO_KHR │ │ argument value specified when memobj │
│ │ │ is created using │
│ │ │ clCreateFromDX9MediaSurfaceKHR(3clc) │
│ │ │ (If the │
│ │ │ cl_khr_dx9_media_sharing(3clc) │
│ │ │ extension is supported) │
├──────────────────────────┼───────────────────────────┼──────────────────────────────────────┤
│CL_MEM_D3D11_RESOURCE_KHR │ ID3D11Resource * │ If the cl_khr_d3d11_sharing │
│ │ │ extension is supported, If memobj │
│ │ │ was created using │
│ │ │ clCreateFromD3D11BufferKHR(3clc), │
│ │ │ clCreateFromD3D11Texture2DKHR(3clc), │
│ │ │ or │
│ │ │ clCreateFromD3D11Texture3DKHR(3clc), │
│ │ │ returns the resource argument │
│ │ │ specified when memobj was created. │
└──────────────────────────┴───────────────────────────┴──────────────────────────────────────┘
param_value
A pointer to memory where the appropriate result being queried is returned. If param_value is NULL,
it is ignored.
param_value_size
Used to specify the size in bytes of memory pointed to by param_value. This size must be ≥ size of
return type as described in the table above.
param_value_size_ret
Returns the actual size in bytes of data being queried by param_value. If param_value_size_ret is
NULL, it is ignored.
ERRORS
Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of the following
errors:
• CL_INVALID_VALUE if param_name is not valid, or if size in bytes specified by param_value_size is <
the size of return type as described in the table above and param_value is not NULL.
• CL_INVALID_MEM_OBJECT if memobj is a not a valid memory object.
• CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL implementation
on the device.
• CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the OpenCL
implementation on the host.
• CL_INVALID_D3D10_RESOURCE_KHR If the cl_khr_d3d10_sharing(3clc) extension is enabled and if
param_name is CL_MEM_D3D10_RESOURCE_KHR and memobj was not created by the function
clCreateFromD3D10BufferKHR(3clc), clCreateFromD3D10Texture2DKHR(3clc), or
clCreateFromD3D10Texture3DKHR(3clc).
• CL_INVALID_DX9_MEDIA_SURFACE_KHR if param_name is CL_MEM_DX9_MEDIA_SURFACE_INFO_KHR and memobj was
not created by the function clCreateFromDX9MediaSurfaceKHR(3clc) from a Direct3D9 surface. (If the
cl_khr_dx9_media_sharing(3clc) extension is supported)
• CL_INVALID_D3D11_RESOURCE_KHR If the cl_khr_d3d11_sharing extension is supported, if param_name is
CL_MEM_D3D11_RESOURCE_KHR and memobj was not created by the function
clCreateFromD3D11BufferKHR(3clc), clCreateFromD3D11Texture2DKHR(3clc), or
clCreateFromD3D11Texture3DKHR(3clc)."
SPECIFICATION
OpenCL Specification[1]
SEE ALSO
clGetImageInfo(3clc)
AUTHORS
The Khronos Group
COPYRIGHT
Copyright © 2007-2011 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.
NOTES
1. OpenCL Specification
page 125, section 5.4.5 - Memory Object Queries