table of contents
CLCREATEBUFFER(3clc) | OpenCL Manual | CLCREATEBUFFER(3clc) |
NAME¶
clCreateBuffer - Creates a buffer object.¶
cl_mem
clCreateBuffer(cl_context context,
cl_mem_flags flags, size_t size,
void *host_ptr,
cl_int *errcode_ret);
PARAMETERS¶
contextA valid OpenCL context used to create the buffer
object.
flags
A bit-field that is used to specify allocation and usage
information such as the memory arena that should be used to allocate the
buffer object and how it will be used. The following table describes the
possible values for flags. If value specified for flags is 0,
the default is used which is CL_MEM_READ_WRITE.
size
cl_mem_flags | Description |
CL_MEM_READ_WRITE | This flag specifies that the memory object will be read and written by a kernel. This is the default. |
CL_MEM_WRITE_ONLY | This flags specifies that the memory object will be written but not read by a kernel. Reading from a buffer or image object created with CL_MEM_WRITE_ONLY inside a kernel is undefined. CL_MEM_READ_WRITE and CL_MEM_WRITE_ONLY are mutually exclusive. |
CL_MEM_READ_ONLY | This flag specifies that the memory object is a read-only memory object when used inside a kernel. Writing to a buffer or image object created with CL_MEM_READ_ONLY inside a kernel is undefined. CL_MEM_READ_WRITE or CL_MEM_WRITE_ONLY and CL_MEM_READ_ONLY are mutually exclusive. |
CL_MEM_USE_HOST_PTR | This flag is valid only if host_ptr is not NULL. If specified, it indicates that the application wants the OpenCL implementation to use memory referenced by host_ptr as the storage bits for the memory object. OpenCL implementations are allowed to cache the buffer contents pointed to by host_ptr in device memory. This cached copy can be used when kernels are executed on a device. The result of OpenCL commands that operate on multiple buffer objects created with the same host_ptr or overlapping host regions is considered to be undefined. Refer to the dataTypes(3clc) for host_ptr for memory objects (buffer and images) created using CL_MEM_USE_HOST_PTR. |
CL_MEM_ALLOC_HOST_PTR | This flag specifies that the application wants the OpenCL implementation to allocate memory from host accessible memory. CL_MEM_ALLOC_HOST_PTR and CL_MEM_USE_HOST_PTR are mutually exclusive. |
CL_MEM_COPY_HOST_PTR | This flag is valid only if host_ptr is not NULL. If specified, it indicates that the application wants the OpenCL implementation to allocate memory for the memory object and copy the data from memory referenced by host_ptr. CL_MEM_COPY_HOST_PTR and CL_MEM_USE_HOST_PTR are mutually exclusive. CL_MEM_COPY_HOST_PTR can be used with CL_MEM_ALLOC_HOST_PTR to initialize the contents of the cl_mem object allocated using host-accessible (e.g. PCIe) memory. |
CL_MEM_HOST_WRITE_ONLY | This flag specifies that the host will only write to the memory object (using OpenCL APIs that enqueue a write or a map for write). This can be used to optimize write access from the host (e.g. enable write combined allocations for memory objects for devices that communicate with the host over a system bus such as PCIe). |
CL_MEM_HOST_READ_ONLY | This flag specifies that the host will only read the memory object (using OpenCL APIs that enqueue a read or a map for read). CL_MEM_HOST_WRITE_ONLY and CL_MEM_HOST_READ_ONLY are mutually exclusive. |
CL_MEM_HOST_NO_ACCESS | This flag specifies that the host will not read or write the memory object. CL_MEM_HOST_WRITE_ONLY or CL_MEM_HOST_READ_ONLY and CL_MEM_HOST_NO_ACCESS are mutually exclusive. |
The size in bytes of the buffer memory object to be
allocated.
host_ptr
A pointer to the buffer data that may already be
allocated by the application. The size of the buffer that host_ptr
points to must be ≥ size bytes.
errcode_ret
Returns an appropriate error code. If errcode_ret
is NULL, no error code is returned.
ERRORS¶
Returns a valid non-zero 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 as defined in the table above.
•CL_INVALID_BUFFER_SIZE if size is 0.
Implementations may return CL_INVALID_BUFFER_SIZE if size is greater
than the CL_DEVICE_MAX_MEM_ALLOC_SIZE value specified in the table of
allowed values for param_name for clGetDeviceInfo(3clc) for all
devices in context.
•CL_INVALID_HOST_PTR if host_ptr is NULL
and CL_MEM_USE_HOST_PTR or CL_MEM_COPY_HOST_PTR are set in
flags or if host_ptr is not NULL but CL_MEM_COPY_HOST_PTR
or CL_MEM_USE_HOST_PTR are not set in flags.
•CL_MEM_OBJECT_ALLOCATION_FAILURE if there is a
failure to allocate memory for buffer 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.
SPECIFICATION¶
OpenCL Specification[1]SEE ALSO¶
clEnqueueReadBuffer(3clc), clEnqueueWriteBuffer(3clc), clEnqueueCopyBuffer(3clc), clCreateSubBuffer(3clc), classDiagram(3clc)AUTHORS¶
The Khronos GroupCOPYRIGHT¶
Copyright © 2007-2011 The Khronos Group Inc.NOTES¶
- 1.
- OpenCL Specification
page 66, section 5.2.1 - Creating Buffer Objects
06/18/2014 | The Khronos Group |