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<title>clCreateFromDX9MediaSurfaceKHR</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
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</head>
<body>
<div class="refentry">
<a id="idp38119580"></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>typedef struct _cl_dx9_surface_info_khr<br />
{<br />
IDirect3DSurface9 *resource; 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>
<h4><a id="idp38033756"></a>DX9 Media Surface Sharing</h4>
<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_media_sharing" will be present in the
<code class="constant">CL_PLATFORM_EXTENSIONS</code> or <code class="constant">CL_DEVICE_EXTENSIONS</code>
string described in the table of allowed values for <code class="varname">param_name</code> for
<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>
<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 two tables below.
</p>
<div class="informaltable">
<table 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 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 D3DFMT_A32FB32FG32FR32F 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_MEDIA_ADAPTER_TYPE_KHR</code>,
<code class="constant">CL_MEM_MEDIA_SURFACE_INFO_KHR</code> and
<code class="constant">CL_IMAGE_MEDIA_SURFACE_PLANE_KHR</code> as described for
<a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a> and in the
information below about accessing mapped regions of a memory object.
</p>
<h4><a id="idp42459212"></a>Accessing mapped regions of a memory object</h4>
<p>
This section describes the behavior of OpenCL commands that access
mapped regions of a memory object.
</p>
<p>
The contents of the region of a memory object and associated memory objects
(sub-buffer objects or 1D image buffer objects that overlap this region) mapped
for writing (i.e. <code class="constant">CL_MAP_WRITE</code> or
<code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code> is set in <code class="varname">map_flags</code>
argument to <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>
or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>) are
considered to be undefined until this region is unmapped.
</p>
<p>
Multiple commands in command-queues can map a region or overlapping regions of a memory
object and associated memory objects (sub-buffer objects or 1D image buffer objects that
overlap this region) for reading (i.e. <code class="varname">map_flags</code> = <code class="constant">CL_MAP_READ</code>).
The contents of the regions of a memory object mapped for reading can also be read by kernels
and other OpenCL commands (such as
<a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>) executing on a device(s).
</p>
<p>
Mapping (and unmapping) overlapped regions in a memory object and/or associated memory
objects (sub-buffer objects or 1D image buffer objects that overlap this region) for writing
is an error and will result in <code class="constant">CL_INVALID_OPERATION</code> error returned by
<a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>
or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>.
</p>
<p>
If a memory object is currently mapped for writing, the application must ensure that the memory
object is unmapped before any enqueued kernels or commands that read from or write to this
memory object or any of its associated memory objects (sub-buffer or 1D image buffer objects)
or its parent object (if the memory object is a sub-buffer or 1D image buffer object) begin
execution; otherwise the behavior is undefined.
</p>
<p>
If a memory object is currently mapped for reading, the application must ensure that the memory
object is unmapped before any enqueued kernels or commands that write to this memory object
or any of its associated memory objects (sub-buffer or 1D image buffer objects) or its parent
object (if the memory object is a sub-buffer or 1D image buffer object) begin execution;
otherwise the behavior is undefined.
</p>
<p>
Accessing the contents of the memory region referred to by the mapped pointer that has
been unmapped is undefined.
</p>
<p>
The mapped pointer returned by
<a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>
or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> can be used as
<code class="varname">ptr</code> argument value to
<a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>,
<a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>,
<a class="citerefentry" href="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</span></span></a>,
<a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>,
<a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>, and
<a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>,
provided the rules described above are adhered to.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns <span class="errorname">CL_SUCCESS</span> 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 plane 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_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="http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf#page=89" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<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="clGetDeviceIDsFromDX9MediaAdapterKHR.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDsFromDX9MediaAdapterKHR</span></span></a>,
<a class="citerefentry" href="clEnqueueAcquireDX9MediaSurfacesKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueAcquireDX9MediaSurfacesKHR</span></span></a>,
<a class="citerefentry" href="clEnqueueReleaseDX9MediaSurfacesKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseDX9MediaSurfacesKHR</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>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.
</div>
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