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<title>clCreateFromDX9MediaSurfaceKHR</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="clCreateFromDX9MediaSurfaceKHR" />
</head>
<body>
<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clCreateFromDX9MediaSurfaceKHR"></a>
<h1>clCreateFromDX9MediaSurfaceKHR</h1>
<p>Creates an OpenCL image object from a media surface.</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a>
<strong class="fsfunc">clCreateFromDX9MediaSurfaceKHR</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_flags" target="pagedisplay">cl_mem_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>cl_dx9_media_adapter_type_khr <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">adapter_type</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*surface_info</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">plane</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_ret</var>
<code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">context</code>
</span>
</dt>
<dd>
<p>
A valid OpenCL context created from a media adapter.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">flags</code>
</span>
</dt>
<dd>
<p>
A bit-field that is used to specify usage information. Refer
to the table of allowed values for <code class="varname">flags</code> for
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>. Only
<code class="constant">CL_MEM_READ_ONLY</code>, <code class="constant">CL_MEM_WRITE_ONLY</code>,
and <code class="constant">CL_MEM_READ_WRITE</code> values specified
in the table of allowed values for <code class="varname">flags</code> for
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>
can be used.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">adapter_type</code>
</span>
</dt>
<dd>
<p>
A value from enumeration of supported adapters described in the
table of <code class="varname">cl_dx9_media_adapter_type_khr</code> values for
<a class="citerefentry" href="clGetDeviceIDsFromDX9MediaAdapterKHR.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDsFromDX9MediaAdapterKHR</span></span></a>.
The type of <code class="varname">surface_info</code> is determined by the adapter
type. The implementation does not need to support all adapter types. This
approach provides flexibility to support additional adapter types in the
future. Supported adapter types are <code class="constant">CL_ADAPTER_D3D9_KHR</code>,
<code class="constant">CL_ADAPTER_D3D9EX_KHR</code>, and
<code class="constant">CL_ADAPTER_DXVA_KHR</code>.
</p>
<p>
If <code class="varname">adapter_type</code> is <code class="constant">CL_ADAPTER_D3D9_KHR</code>,
<code class="constant">CL_ADAPTER_D3D9EX_KHR</code>, or
<code class="constant">CL_ADAPTER_DXVA_KHR</code>, the <code class="varname">surface_info</code>
points to the following structure:
</p>
<p> <code class="code"><div class="literallayout"><p><br />
typedef struct _cl_dx9_surface_info_khr<br />
{<br />
    IDirect3DSurface9 *resource; <br />
    HANDLE shared_handle;<br />
} cl_dx9_surface_info_khr;<br />
                    </p></div></code>
</p>
<p>
For D3D9 surfaces, we need both the handle to the resource and the resource
itself to have a sufficient amount of information to eliminate a copy of the
surface for sharing in cases where this is possible. Elimination of the copy
is driver dependent. <code class="varname">shared_handle</code> may be NULL and this
may result in sub-optimal performance.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">surface_info</code>
</span>
</dt>
<dd>
<p>
A pointer to one of the structures defined in the <code class="varname">adapter_type</code>
description above passed in as a <span class="type">void</span> *.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">plane</code>
</span>
</dt>
<dd>
<p>
The plane of resource to share for planar surface formats. For planar formats,
we use the plane parameter to obtain a handle to thie specific plane (Y, U or
V for example). For nonplanar formats used by media, <code class="varname">plane</code>
must be 0.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">errcode_ret</code>
</span>
</dt>
<dd>
<p>
An appropriate error code. If <code class="varname">errcode_ret</code> is NULL, no
error code is returned.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
The width and height of the returned OpenCL 2D image object are determined by the
width and height of the plane of resource. The channel type and order of the returned
image object is determined by the format and plane of resource and are described in
tables 9.10.3 and 9.10.4.
</p>
<p>
This call will increment the internal media surface count on
<code class="varname">resource</code>. The internal media surface reference count on
<code class="varname">resource</code> will be decremented when the OpenCL reference count on
the returned OpenCL memory object drops to zero.
</p>
<p>
General information about sharing memory objects with DX9 follows.
</p>
<p>
The goal of this extension is to allow applications to use media surfaces as OpenCL memory
objects. This allows efficient sharing of data between OpenCL and selected adapter APIs (only
DX9 for now). If this extension is supported, an OpenCL image object can be created from a
media surface and the OpenCL API can be used to execute kernels that read and/or write
memory objects that are media surfaces. Note that OpenCL memory objects may be created
from the adapter media surface if and only if the OpenCL context has been created from that
adapter.
</p>
<p>
If this extension is supported by an implementation, the string "cl_khr_dx9_media_sharing"
will be present in the <code class="constant">CL_PLATFORM_EXTENSIONS</code>
(see <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>)
or <code class="constant">CL_DEVICE_EXTENSIONS</code>
(see <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>).
</p>
<p>
As currently proposed the interfaces for this extension would be provided in
<code class="code">cl_dx9_media_sharing.h</code>.
</p>
<h4><a id="id-1.6.8"></a>Surface formats for Media Surface Sharing</h4>
<p>
This section includes the D3D surface formats
that are supported when the adapter type is one of the Direct 3D lineage. Using a D3D
surface format not listed here is an error. To extend the use of this extension to support
media adapters beyond DirectX9 tables similar to the ones in this section will need to be
defined for the surface formats supported by the new media adapter. All implementations
that support this extension are required to support the NV12 surface format, the other
surface formats supported are the same surface formats that the adapter you are sharing
with supports as long as they are listed in the tables below (Tables 9.10.3 and 9.10.4).
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="center" class="col1" />
<col align="center" class="col2" />
</colgroup>
<thead>
<tr>
<th align="center">FOUR CC code</th>
<th align="center">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">FOURCC('N', 'V', '1', '2'), Plane 0</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">FOURCC('N', 'V', '1', '2'), Plane 1</td>
<td align="center">
<code class="constant">CL_RG, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">FOURCC('Y', 'V', '1', '2'), Plane 0</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">FOURCC('Y', 'V', '1', '2'), Plane 1</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">FOURCC('Y', 'V', '1', '2'), Plane 2</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
In the table above, NV12 Plane 0 corresponds to the luminance (Y) channel and Plane 1
corresponds to the UV channels. The YV12 Plane 0 corresponds to the Y channel, Plane
1 to the U channel and Plane 2 to the V channel. Note that the YUV formats map to
<code class="constant">CL_R</code> and <code class="constant">CL_RG</code> but do not perform any YUV to
RGB conversion and vice-versa.
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="center" class="col1" />
<col align="center" class="col2" />
</colgroup>
<thead>
<tr>
<th align="center">D3D format</th>
<th align="center">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">D3DFMT_R32F</td>
<td align="center">
<code class="constant">CL_R, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_R16F</td>
<td align="center">
<code class="constant">CL_R, CL_HALF_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_L16</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A8</td>
<td align="center">
<code class="constant">CL_A, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_L8</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_G32R32F</td>
<td align="center">
<code class="constant">CL_RG, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_G16R16F</td>
<td align="center">
<code class="constant">CL_RG, CL_HALF_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_G16R16</td>
<td align="center">
<code class="constant">CL_RG, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A8L8</td>
<td align="center">
<code class="constant">CL_RG, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A32B32G32R32F</td>
<td align="center">
<code class="constant">CL_RGBA, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A16B16G16R16F</td>
<td align="center">
<code class="constant">CL_RGBA, CL_HALF_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A16B16G16R16</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A8B8G8R8</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_X8B8G8R8</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_A8R8G8B8</td>
<td align="center">
<code class="constant">CL_BGRA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">D3DFMT_X8R8G8B8</td>
<td align="center">
<code class="constant">CL_BGRA, CL_UNORM_INT8</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
Note that D3D9 format names seem to imply that the order of the color channels are switched
relative to OpenCL but this is not the case. For example, layout of channels for each pixel
for <code class="constant">D3DFMT_A32FB32FG32FR32F</code> is the same as
<code class="constant">CL_RGBA</code>, <code class="constant">CL_FLOAT</code>.
</p>
<p>
Properties of media surface objects may be queried using
<a class="citerefentry" href="clGetMemObjectInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetMemObjectInfo</span></span></a>
and <a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a> with
<code class="varname">param_name</code> <code class="constant">CL_MEM_DX9_MEDIA_ADAPTER_TYPE_KHR</code>,
<code class="constant">CL_MEM_DX9_MEDIA_SURFACE_INFO_KHR</code> and
<code class="constant">CL_IMAGE_DX9_MEDIA_SURFACE_PLANE_KHR</code>.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns a valid non-zero 2D image object and
<code class="varname">errcode_ret</code> is set to <span class="errorname">CL_SUCCESS</span> if the 2D
image object is created successfully. Otherwise, it returns a NULL value with one
of the following error values returned in <code class="varname">errcode_ret</code>:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not
a valid context.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in
<code class="varname">flags</code> are not valid or if
<code class="varname">plane</code> is not a valid plane of
<code class="varname">resource</code> specified in <code class="varname">surface_info</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DX9_MEDIA_SURFACE_KHR</span> if
<code class="varname">resource</code> specified in <code class="varname">surface_info</code> is not
a valid resource or is not associated with <code class="varname">adapter_type</code> (e.g.,
<code class="varname">adapter_type</code> is set to <code class="constant">CL_ADAPTER_D3D9_KHR</code>
and <code class="varname">resource</code> is not a Direct3D 9 surface created in
<code class="constant">D3DPOOL_DEFAULT</code>).
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DX9_MEDIA_SURFACE_KHR</span> if
<code class="varname">shared_handle</code> specified in <code class="varname">surface_info</code>
is not NULL or a valid handle value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DX9_MEDIA_SURFACE_KHR</span> if
<code class="varname">adapter_type</code> is set to a media
adapter and the <code class="varname">surface_info</code> does
not reference a media surface of the required type, or if
<code class="varname">adapter_type</code> is set to a media
adapter type and <code class="varname">surface_info</code>
does not contain a valid reference to
a media surface on that adapter, by
<a class="citerefentry" href="clGetMemObjectInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetMemObjectInfo</span></span></a>
when <code class="varname">param_name</code> is a surface or
handle when the image was not created from an
appropriate media surface, and from
<a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a>
when <code class="varname">param_name</code> is
<code class="constant">CL_IMAGE_DX9_MEDIA_PLANE_KHR</code> and image was
not created from an appropriate media surface.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</span> if the texture format
of <code class="varname">resource</code> is not listed in tables 9.10.3 and 9.10.4.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if there are no devices in
<code class="varname">context</code> that support <code class="varname">adapter_type</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p><img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-extensions.pdf#namedest=clCreateFromDX9MediaSurfaceKHR" target="OpenCL Spec">OpenCL Specification</a>
</p>
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<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="cl_khr_dx9_media_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_dx9_media_sharing</span></span></a>,
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>,
</p>
</div>
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