'\" t
.\"     Title: clEnqueueCopyBuffer
.\"    Author: The Khronos Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/14/2021
.\"    Manual: OpenCL Manual
.\"    Source: The Khronos Group
.\"  Language: English
.\"
.TH "CLENQUEUECOPYBUFFER" "3clc" "01/14/2021" "The Khronos Group" "OpenCL Manual"
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.nh
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.SH "NAME"
clEnqueueCopyBuffer \- Enqueues a command to copy from one buffer object to another\&.
.SH ""
.HP \w'cl_int\ clEnqueueCopyBuffer('u
.BI "cl_int clEnqueueCopyBuffer(cl_command_queue\ " "command_queue" ", cl_mem\ " "src_buffer" ", cl_mem\ " "dst_buffer" ", size_t\ " "src_offset" ", size_t\ " "dst_offset" ", size_t\ " "size" ", cl_uint\ " "num_events_in_wait_list" ", const\ cl_event\ *" "event_wait_list" ", cl_event\ *" "event" ");"
.SH "PARAMETERS"
.PP
\fI command_queue \fR
.RS 4
The command\-queue in which the copy command will be queued\&. The OpenCL context associated with
\fIcommand_queue\fR,
\fIsrc_buffer\fR, and
\fIdst_buffer\fR
must be the same\&.
.RE
.PP
\fI src_offset \fR
.RS 4
The offset where to begin copying data from
\fIsrc_buffer\fR\&.
.RE
.PP
\fI dst_offset \fR
.RS 4
The offset where to begin copying data into
\fIdst_buffer\fR\&.
.RE
.PP
\fIsize\fR
.RS 4
Refers to the size in bytes to copy\&.
.RE
.PP
\fI event_wait_list \fR, \fI num_events_in_wait_list \fR
.RS 4
Specify events that need to complete before this particular command can be executed\&. If
\fIevent_wait_list\fR
is NULL, then this particular command does not wait on any event to complete\&. If
\fIevent_wait_list\fR
is NULL,
\fInum_events_in_wait_list\fR
must be 0\&. If
\fIevent_wait_list\fR
is not NULL, the list of events pointed to by
\fIevent_wait_list\fR
must be valid and
\fInum_events_in_wait_list\fR
must be greater than 0\&. The events specified in
\fIevent_wait_list\fR
act as synchronization points\&. The context associated with events in
\fIevent_wait_list\fR
and
\fIcommand_queue\fR
must be the same\&. The memory associated with
\fIevent_wait_list\fR
can be reused or freed after the function returns\&.
.RE
.PP
\fI event \fR
.RS 4
Returns an event object that identifies this particular copy command and can be used to query or queue a wait for this particular command to complete\&.
\fIevent\fR
can be NULL in which case it will not be possible for the application to query the status of this command or queue a wait for this command to complete\&.
\fBclEnqueueBarrierWithWaitList\fR(3clc)
can be used instead\&. If the
\fIevent_wait_list\fR
and the
\fIevent\fR
arguments are not NULL, the
\fIevent\fR
argument should not refer to an element of the
\fIevent_wait_list\fR
array\&.
.RE
.SH "ERRORS"
.PP
Returns
CL_SUCCESS
if the function is executed successfully\&. Otherwise, it returns one of the following errors:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_COMMAND_QUEUE if \fIcommand_queue\fR
is not a valid command\-queue\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_CONTEXT if the context associated
with \fIcommand_queue\fR, \fIsrc_buffer\fR, and
\fIdst_buffer\fR are not the same or if the context associated with
\fIcommand_queue\fR and events in \fIevent_wait_list\fR
are not the same\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_MEM_OBJECT if \fIsrc_buffer\fR
and \fIdst_buffer\fR are not valid buffer objects\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_VALUE if \fIsrc_offset\fR,
\fIdst_offset\fR, \fIsize\fR, \fIsrc_offset\fR
+ \fIsize\fR, or \fIdst_offset\fR + \fIsize\fR
require accessing elements outside the \fIsrc_buffer\fR and
\fIdst_buffer\fR buffer objects respectively\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_VALUE if \fIsize\fR is 0\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_EVENT_WAIT_LIST
if \fIevent_wait_list\fR is NULL and
\fInum_events_in_wait_list\fR is >
0, or \fIevent_wait_list\fR is not NULL and
\fInum_events_in_wait_list\fR is 0, or if event objects in
\fIevent_wait_list\fR are not valid events\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_MISALIGNED_SUB_BUFFER_OFFSET  if
\fIsrc_buffer\fR is a sub\-buffer object and \fIoffset\fR
specified when the sub\-buffer object is created is not aligned to
\fBCL_DEVICE_MEM_BASE_ADDR_ALIGN\fR value for device associated
with queue\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_MISALIGNED_SUB_BUFFER_OFFSET  if
\fIdst_buffer\fR is a sub\-buffer object and \fIoffset\fR
specified when the sub\-buffer object is created is not aligned to
\fBCL_DEVICE_MEM_BASE_ADDR_ALIGN\fR value for device associated
with \fIqueue\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_MEM_COPY_OVERLAP if \fIsrc_buffer\fR
and \fIdst_buffer\fR are the same buffer or subbuffer object and
the source and destination regions overlap or if \fIsrc_buffer\fR
and \fIdst_buffer\fR are different sub\-buffers of the same associated
buffer object and they overlap\&. The regions overlap if \fIsrc_offset\fR
≤ to \fIdst_offset\fR ≤ to \fIsrc_offset\fR + size \-
1, or if \fIdst_offset\fR ≤ to \fIsrc_offset\fR ≤
to \fIdst_offset\fR + size \- 1\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_MEM_OBJECT_ALLOCATION_FAILURE if there is a failure
to allocate memory for data store associated with \fIsrc_buffer\fR
or \fIdst_buffer\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_OUT_OF_RESOURCES if there is a failure to allocate
resources required by the OpenCL implementation on the device\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_OUT_OF_HOST_MEMORY if there is a failure to allocate
resources required by the OpenCL implementation on the host\&.
.RE
.SH "SPECIFICATION"
.PP
\m[blue]\fBOpenCL Specification\fR\m[]\&\s-2\u[1]\d\s+2
.SH "SEE ALSO"
.PP
\fBclEnqueueReadBuffer\fR(3clc),
\fBclEnqueueWriteBuffer\fR(3clc),
\fBclCreateBuffer\fR(3clc),
\fBclCreateSubBuffer\fR(3clc),
\fBclEnqueueCopyBufferToImage\fR(3clc),
\fBclEnqueueCopyImageToBuffer\fR(3clc)
.SH "AUTHORS"
.PP
\fBThe Khronos Group\fR
.SH "COPYRIGHT"
.br
Copyright \(co 2007-2011 The Khronos Group Inc.
.br
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.
.sp
.SH "NOTES"
.IP " 1." 4
OpenCL Specification
.RS 4
\%page 79, section 5.2.2 - Reading, Writing, Copying Buffer Objects
.RE