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skia / external / github.com / KhronosGroup / OpenCL-Registry / refs/heads/246-enums / . / sdk / 2.2 / docs / man / html / clCreateBuffer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.8">
<title>clCreateBuffer(3)</title>
<style>
/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
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<body class="manpage">
<div id="header">
<h1>clCreateBuffer(3) Manual Page</h1>
<h2 id="_name">Name</h2>
<div class="sectionbody">
<p>clCreateBuffer - Creates a buffer object.</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_c_specification">C Specification</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A <strong>buffer object</strong> is created using the following function</p>
</div>
<div id="clCreateBuffer" class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c++" data-lang="c++">cl_mem clCreateBuffer(
cl_context context,
cl_mem_flags flags,
size_t size,
void* host_ptr,
cl_int* errcode_ret);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_parameters">Parameters</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><em>context</em> is a valid OpenCL context used to create the buffer object.</p>
</li>
<li>
<p><em>flags</em> is 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 <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#memory-flags-table" target="_blank" rel="noopener">Memory Flags</a> table describes the possible values
for <em>flags</em>.
If the value specified for <em>flags</em> is 0, the default is used which is
<code>CL_&#8203;MEM_&#8203;READ_&#8203;WRITE</code>.</p>
</li>
<li>
<p><em>size</em> is the size in bytes of the buffer memory object to be allocated.</p>
</li>
<li>
<p><em>host_ptr</em> is a pointer to the buffer data that may already be allocated
by the application.
The size of the buffer that <em>host_ptr</em> points to must be ≥ <em>size</em>
bytes.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<table id="memory-flags-table" class="tableblock frame-all grid-all stretch">
<caption class="title">Table 1. List of supported memory flag values</caption>
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"><strong>cl_mem_flags</strong></th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;READ_&#8203;WRITE</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the memory object will be read
and written by a kernel.
This is the default.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;WRITE_&#8203;ONLY</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the memory object will be
written but not read by a kernel.</p>
<p class="tableblock"> Reading from a buffer or image object created with <code>CL_&#8203;MEM_&#8203;WRITE_&#8203;ONLY</code>
inside a kernel is undefined.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;READ_&#8203;WRITE</code> and <code>CL_&#8203;MEM_&#8203;WRITE_&#8203;ONLY</code> are mutually exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;READ_&#8203;ONLY</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the memory object is a
readonly memory object when used inside a kernel.</p>
<p class="tableblock"> Writing to a buffer or image object created with <code>CL_&#8203;MEM_&#8203;READ_&#8203;ONLY</code> inside
a kernel is undefined.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;READ_&#8203;WRITE</code> or <code>CL_&#8203;MEM_&#8203;WRITE_&#8203;ONLY</code> and <code>CL_&#8203;MEM_&#8203;READ_&#8203;ONLY</code> are mutually
exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag is valid only if host_ptr is not <code>NULL</code>.
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.</p>
<p class="tableblock"> The contents of the memory pointed to by host_ptr at the time of the
<strong>clCreateBuffer</strong> call define the initial contents of the buffer object.</p>
<p class="tableblock"> 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.</p>
<p class="tableblock"> The result of OpenCL commands that operate on multiple buffer objects
created with the same host_ptr or from overlapping host or SVM regions
is considered to be undefined.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;ALLOC_&#8203;HOST_&#8203;PTR</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the application wants the OpenCL implementation
to allocate memory from host accessible memory.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;ALLOC_&#8203;HOST_&#8203;PTR</code> and <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> are mutually exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;COPY_&#8203;HOST_&#8203;PTR</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag is valid only if host_ptr is not <code>NULL</code>.
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.
The implementation will copy the memory immediately and host_ptr is
available for reuse by the application when the <strong>clCreateBuffer</strong>,
<strong>clCreateImage</strong>, <strong>clCreateImage2D</strong> or <strong>clCreateImage3D</strong> operation returns.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;COPY_&#8203;HOST_&#8203;PTR</code> and <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> are mutually exclusive.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;COPY_&#8203;HOST_&#8203;PTR</code> can be used with <code>CL_&#8203;MEM_&#8203;ALLOC_&#8203;HOST_&#8203;PTR</code> to
initialize the contents of the cl_mem object allocated using
host-accessible (e.g. PCIe) memory.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;HOST_&#8203;WRITE_&#8203;ONLY</code></p>
<p class="tableblock"><a href="#unified-spec">Missing before</a> version 1.2.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">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).</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;HOST_&#8203;READ_&#8203;ONLY</code></p>
<p class="tableblock"><a href="#unified-spec">Missing before</a> version 1.2.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the host will only read
the memory object (using OpenCL APIs that enqueue a read or a map for
read).</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;HOST_&#8203;WRITE_&#8203;ONLY</code> and <code>CL_&#8203;MEM_&#8203;HOST_&#8203;READ_&#8203;ONLY</code> are mutually exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;HOST_&#8203;NO_&#8203;ACCESS</code></p>
<p class="tableblock"><a href="#unified-spec">Missing before</a> version 1.2.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the host will not read or
write the memory object.</p>
<p class="tableblock"> <code>CL_&#8203;MEM_&#8203;HOST_&#8203;WRITE_&#8203;ONLY</code> or <code>CL_&#8203;MEM_&#8203;HOST_&#8203;READ_&#8203;ONLY</code> and
<code>CL_&#8203;MEM_&#8203;HOST_&#8203;NO_&#8203;ACCESS</code> are mutually exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;MEM_&#8203;KERNEL_&#8203;READ_&#8203;AND_&#8203;WRITE</code></p>
<p class="tableblock"><a href="#unified-spec">Missing before</a> version 2.0.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag is only used by <strong>clGetSupportedImageFormats</strong> to query image
formats that may be both read from and written to by the same kernel
instance.
To create a memory object that may be read from and written to use
<code>CL_&#8203;MEM_&#8203;READ_&#8203;WRITE</code>.</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>The user is responsible for ensuring that data passed into and out of OpenCL
images are natively aligned relative to the start of the buffer as per
kernel language or IL requirements.
OpenCL buffers created with <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> need to provide an
appropriately aligned host memory pointer that is aligned to the data types
used to access these buffers in a kernel(s).</p>
</div>
<div class="paragraph">
<p><em>errcode_ret</em> will return an appropriate error code.
If <em>errcode_ret</em> is <code>NULL</code>, no error code is returned.</p>
</div>
<div class="paragraph">
<p>If <strong>clCreateBuffer</strong> is called with <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> set in its <em>flags</em>
argument, the contents of the memory pointed to by <em>host_ptr</em> at the time
of the <strong>clCreateBuffer</strong> call define the initial contents of the
buffer object.</p>
</div>
<div class="paragraph">
<p>If <strong>clCreateBuffer</strong> is called with a pointer returned by <strong>clSVMAlloc</strong> as its
<em>host_ptr</em> argument, and <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> is set in its <em>flags</em> argument,
<strong>clCreateBuffer</strong> will succeed and return a valid non-zero buffer object as
long as the <em>size</em> argument to <strong>clCreateBuffer</strong> is no larger than the <em>size</em>
argument passed in the original <strong>clSVMAlloc</strong> call.
The new buffer object returned has the shared memory as the underlying
storage.
Locations in the buffers underlying shared memory can be operated on using
atomic operations to the devices level of support as defined in the memory
model.</p>
</div>
<div class="paragraph">
<p><strong>clCreateBuffer</strong> returns a valid non-zero buffer object and <em>errcode_ret</em> is
set to <code>CL_&#8203;SUCCESS</code> if the buffer object is created successfully.
Otherwise, it returns a <code>NULL</code> value with one of the following error values
returned in <em>errcode_ret</em>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>CL_&#8203;INVALID_&#8203;CONTEXT</code> if <em>context</em> is not a valid context.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;VALUE</code> if values specified in <em>flags</em> are not valid as defined
in the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#memory-flags-table" target="_blank" rel="noopener">Memory Flags</a> table.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;BUFFER_&#8203;SIZE</code> if <em>size</em> is 0<sup>4</sup>.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;HOST_&#8203;PTR</code> if <em>host_ptr</em> is <code>NULL</code> and <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> or
<code>CL_&#8203;MEM_&#8203;COPY_&#8203;HOST_&#8203;PTR</code> are set in <em>flags</em> or if <em>host_ptr</em> is not <code>NULL</code>
but <code>CL_&#8203;MEM_&#8203;COPY_&#8203;HOST_&#8203;PTR</code> or <code>CL_&#8203;MEM_&#8203;USE_&#8203;HOST_&#8203;PTR</code> are not set in <em>flags</em>.</p>
</li>
<li>
<p><code>CL_&#8203;MEM_&#8203;OBJECT_&#8203;ALLOCATION_&#8203;FAILURE</code> if there is a failure to allocate
memory for buffer object.</p>
</li>
<li>
<p><code>CL_&#8203;OUT_&#8203;OF_&#8203;RESOURCES</code> if there is a failure to allocate resources required
by the OpenCL implementation on the device.</p>
</li>
<li>
<p><code>CL_&#8203;OUT_&#8203;OF_&#8203;HOST_&#8203;MEMORY</code> if there is a failure to allocate resources
required by the OpenCL implementation on the host.</p>
<div class="dlist">
<dl>
<dt class="hdlist1">4</dt>
<dd>
<p>Implementations may return <code>CL_&#8203;INVALID_&#8203;BUFFER_&#8203;SIZE</code> if size is greater
than <code>CL_&#8203;DEVICE_&#8203;MAX_&#8203;MEM_&#8203;ALLOC_&#8203;SIZE</code> value specified in the
<a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#device-queries-table" target="_blank" rel="noopener">Device Queries</a> table for all devices in
context.</p>
</dd>
</dl>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See Also</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="cl_context.html">cl_context</a>, <a href="cl_int.html">cl_int</a>, <a href="cl_mem_flags.html">cl_mem_flags</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_document_notes">Document Notes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clCreateBuffer" target="_blank" rel="noopener">OpenCL Specification</a></p>
</div>
<div class="paragraph">
<p>This page is extracted from the OpenCL Specification.
Fixes and changes should be made to the Specification, not directly.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_copyright">Copyright</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2014-2020 Khronos Group. This work is licensed under a
<a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
Attribution 4.0 International License</a>.</p>
</div>
</div>
</div>
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