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<title>clCreateFromGLTexture</title>
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<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="clCreateFromGLTexture"></a>
<h1>clCreateFromGLTexture</h1>
<p>
Creates an OpenCL image object, image array object, or image buffer object from an OpenGL texture object,
texture array object, texture buffer object, or a single face of an OpenGL cubemap texture object.
</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">
clCreateFromGLTexture
</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>GLenum <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">texture_target</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>GLint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">miplevel</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td>GLuint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">texture</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 an OpenGL context.
</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 for
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>
for a description of <code class="varname">flags</code>. Only the values
<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> can be used.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> texture_target </code> </span>
</dt>
<dd>
<p>
<code class="varname">texture_target</code>
This value must be one of <code class="constant">GL_TEXTURE_1D</code>,
<code class="constant">GL_TEXTURE_1D_ARRAY</code>,
<code class="constant">GL_TEXTURE_BUFFER</code>, <code class="constant">GL_TEXTURE_2D</code>,
<code class="constant">GL_TEXTURE_2D_ARRAY</code>, <code class="constant">GL_TEXTURE_3D</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_X</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Y</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_POSITIVE_Z</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_X</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Y</code>,
<code class="constant">GL_TEXTURE_CUBE_MAP_NEGATIVE_Z</code>, or
<code class="constant">GL_TEXTURE_RECTANGLE</code>.
(<code class="constant">GL_TEXTURE_RECTANGLE</code> requires OpenGL 3.1.
Alternatively, <code class="constant">GL_TEXTURE_RECTANGLE_ARB</code> may be
specified if the OpenGL extension <code class="code">GL_ARB_texture_rectangle</code> is supported.)
<code class="varname">texture_target</code> is used only to define the image type
of <code class="varname">texture</code>. No reference to a bound GL texture object
is made or implied by this parameter.
</p>
<p>
If the <a class="citerefentry" href="cl_khr_gl_msaa_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_msaa_sharing</span></span></a>
extension is enabled, <code class="varname">texture_target</code>
may be
<code class="constant">GL_TEXTURE_2D_MULTISAMPLE</code> or
<code class="constant">GL_TEXTURE_2D_MULTISAMPLE_ARRAY</code>.
</p>
<p>
If <code class="varname">texture_target</code> is
<code class="constant">GL_TEXTURE_2D_MULTISAMPLE</code>,
<code class="function">clCreateFromGLTexture</code>
creates an
OpenCL 2D multi-sample image object from
an OpenGL 2D multi-sample texture
</p>
<p>
If <code class="varname">texture_target</code> is
<code class="constant">GL_TEXTURE_2D_MULTISAMPLE_ARRAY</code>,
<code class="function">clCreateFromGLTexture</code>
creates an OpenCL 2D multi-sample array
image object from an OpenGL 2D multi-sample
texture.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> miplevel </code> </span>
</dt>
<dd>
<p>
The mipmap level to be used. If
<code class="varname">texture_target</code> is <code class="constant">GL_TEXTURE_BUFFER</code>,
miplevel must be 0. Implementations may return
<code class="constant">CL_INVALID_OPERATION</code> for miplevel values &gt; 0
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> texture </code> </span>
</dt>
<dd>
<p>
The name of a GL 1D, 2D, 3D, 1D array,
2D array, cubemap, rectangle or buffer texture object. The texture object
must be a complete texture as per OpenGL rules on texture completeness. The
<code class="varname">texture</code> format and dimensions defined by OpenGL for the
specified <code class="varname">miplevel</code> of the texture will be used to create
the OpenCL image memory object. Only GL texture objects with an internal
format that maps to appropriate image channel order and data type specified
in tables 5.5 and 5.6 (see
<a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a>)
may be used to create the OpenCL image memory object.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> errcode_ret </code> </span>
</dt>
<dd>
<p>
Returns an appropriate error code as described
below. 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>
If the state of a GL texture object is modified through the GL API
(e.g. <code class="function">glTexImage2D</code>, <code class="function">glTexImage3D</code> or
the values of the texture parameters <code class="constant">GL_TEXTURE_BASE_LEVEL</code>
or <code class="constant">GL_TEXTURE_MAX_LEVEL</code> are modified) while there exists a
corresponding CL image object, subsequent use of the CL image object will result in
undefined behavior.
</p>
<p>
The <a class="citerefentry" href="clRetainMemObject.html"><span class="citerefentry"><span class="refentrytitle">clRetainMemObject</span></span></a>
and <a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle">clReleaseMemObject</span></span></a>
functions can be used to retain and release the image objects.
</p>
<p>
General information about GL sharing follows.
</p>
<p>
The OpenCL specification in section 9.7 defines how to
share data with texture and buffer objects in a parallel OpenGL implementation,
but does not define how the association between an OpenCL context and an OpenGL
context or share group is established. This extension defines optional attributes
to OpenCL context creation routines which associate a GL context or share group
object with a newly created OpenCL context. If this extension is supported
by an implementation, the string "cl_khr_gl_sharing" will be present in the
<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>
or in the <code class="constant">CL_PLATFORM_EXTENSIONS</code>
string described in the table of allowed values for <code class="varname">param_name</code>
for <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>.
</p>
<p>
This section discusses OpenCL functions that allow applications
to use OpenGL buffer, texture, and renderbuffer objects as OpenCL memory objects. This
allows efficient sharing of data between OpenCL and OpenGL. The OpenCL API may be used
to execute kernels that read and/or write memory objects that are also OpenGL objects.
</p>
<p>
An OpenCL image object may be created from an OpenGL texture or
renderbuffer object. An OpenCL buffer object may be created from an OpenGL buffer object.
</p>
<p>
Any supported OpenGL object defined within the GL share
group object, or the share group associated with the GL context from which the CL
context is created, may be shared, with the exception of the default OpenGL objects
(i.e. objects named zero), which may not be shared.
</p>
<h4><a id="id-1.6.9"></a>OpenGL and Corresponding OpenCL Image Formats</h4>
<p>
The table below (Table 9.4) describes
the list of GL texture internal formats and the corresponding CL image formats. If a GL
texture object with an internal format from the table below is successfully created by
OpenGL, then there is guaranteed to be a mapping to one of the corresponding CL image
format(s) in that table. Texture objects created with other OpenGL internal formats may
(but are not guaranteed to) have a mapping to a CL image format; if such mappings exist,
they are guaranteed to preserve all color components, data types, and at least the number
of bits/component actually allocated by OpenGL for that format.
</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">GL internal format</th>
<th align="center">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">
<code class="constant">GL_RGBA8</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT8 or CL_BGRA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_SRGBA8_ALPHA8</code>
</td>
<td align="center">
<code class="constant">CL_sRGBA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center"><code class="constant">GL_RGBA</code>, <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code></td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center"><code class="constant">GL_BGRA</code>, <code class="constant">GL_UNSIGNED_INT_8_8_8_8_REV</code></td>
<td align="center">
<code class="constant">CL_BGRA, CL_UNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA8I, GL_RGBA8I_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_SIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA16I, GL_RGBA16I_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_SIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA32I, GL_RGBA32I_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_SIGNED_INT32</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA8UI, GL_RGBA8UI_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNSIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA16UI, GL_RGBA16UI_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNSIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA32UI, GL_RGBA32UI_EXT</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNSIGNED_INT32</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA8_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_SNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA16</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA16_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_SNORM_INT166</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA16F, GL_RGBA16F_ARB</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_HALF_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RGBA32F, GL_RGBA32F_ARB</code>
</td>
<td align="center">
<code class="constant">CL_RGBA, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R8</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT8 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R8_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_SNORM_INT8 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R16</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_UNORM_INT16 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R16_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_SNORM_INT16 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R16F</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_HALF_FLOAT </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R32F</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_FLOAT </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R8I</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_SIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R16I</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_SIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R32I</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_SIGNED_INT32</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R8UI</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_UNSIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R16UI</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_UNSIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_R32UI</code>
</td>
<td align="center">
<code class="constant">CL_R, CL_UNSIGNED_INT32</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG8</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_UNORM_INT8 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG8_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_SNORM_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG16</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG16_SNORM</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_SNORM_INT16 </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG16F</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_HALF_FLOAT </code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG32F</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG8I</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_SIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG16I</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_SIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG32I</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_SIGNED_INT32</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG8UI</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_UNSIGNED_INT8</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG16UI</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_UNSIGNED_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_RG32UI</code>
</td>
<td align="center">
<code class="constant">CL_RG, CL_UNSIGNED_INT32</code>
</td>
</tr>
</tbody>
</table>
</div>
<p>
If the <a class="citerefentry" href="cl_khr_gl_depth_images.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_depth_images</span></span></a>
extension is enabled, the
following new image formats are added to table 9.4 in section 9.6.3.1 of the OpenCL 2.0
extension specification. If a GL texture object with an internal format from table 9.4 is
successfully created by OpenGL, then there is guaranteed to be a mapping to one of the
corresponding CL image format(s) in that table.
</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">GL internal format</th>
<th align="center">CL image format (channel order, channel data type)</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center">
<code class="constant">GL_DEPTH_COMPONENT32F</code>
</td>
<td align="center">
<code class="constant">CL_DEPTH, CL_FLOAT</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_DEPTH_COMPONENT16</code>
</td>
<td align="center">
<code class="constant">CL_DEPTH, CL_UNORM_INT16</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_DEPTH24_STENCIL8</code>
</td>
<td align="center">
<code class="constant">CL_DEPTH_STENCIL, CL_UNORM_INT24</code>
</td>
</tr>
<tr>
<td align="center">
<code class="constant">GL_DEPTH32F_STENCIL8</code>
</td>
<td align="center">
<code class="constant">CL_DEPTH_STENCIL, CL_FLOAT</code>
</td>
</tr>
</tbody>
</table>
</div>
<h4><a id="id-1.6.14"></a>Lifetime of [GL] Shared Objects</h4>
<p>
An OpenCL memory object created from an OpenGL object
(hereinafter refered to as a "shared CL/GL object") remains valid as long as the
corresponding GL object has not been deleted. If the GL object is deleted through the GL
API (e.g. <code class="function">glDeleteBuffers</code>, <code class="function">glDeleteTextures</code>,
or <code class="function">glDeleteRenderbuffers</code>), subsequent use of the CL buffer or image
object will result in undefined behavior, including but not limited to possible CL errors
and data corruption, but may not result in program termination.
</p>
<p>
The CL context and corresponding command-queues are dependent
on the existence of the GL share group object, or the share group associated with the
GL context from which the CL context is created. If the GL share group object or all GL
contexts in the share group are destroyed, any use of the CL context or command-queue(s)
will result in undefined behavior, which may include program termination. Applications
should destroy the CL command-queue(s) and CL context before destroying the corresponding
GL share group or contexts.
</p>
<h4><a id="id-1.6.17"></a>Synchronizing OpenCL and OpenGL Access</h4>
<p>
In order to ensure data integrity, the application is responsible
for synchronizing access to shared CL/GL objects by their respective APIs. Failure to
provide such synchronization may result in race conditions and other undefined behavior
including non-portability between implementations.
</p>
<p>
Prior to calling <code class="function">clEnqueueAcquireGLObjects</code>,
the application must ensure that any pending GL operations which access the objects
specified in <code class="varname">mem_objects</code> have completed. This may be accomplished
portably by issuing and waiting for completion of a <code class="function">glFinish</code>
command on all GL contexts with pending references to these objects. Implementations
may offer more efficient synchronization methods; for example on some platforms calling
<code class="function">glFlush</code> may be sufficient, or synchronization may be implicit within
a thread, or there may be vendor-specific extensions that enable placing a fence in the
GL command stream and waiting for completion of that fence in the CL command queue. Note
that no synchronization methods other than <code class="function">glFinish</code> are portable
between OpenGL implementations at this time.
</p>
<p>
When the extension
<a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a>
is supported: Prior to calling
<code class="function">clEnqueueAcquireGLObjects</code>,
the application must ensure that any pending
EGL or EGL client API operations which access
the objects specified in <code class="varname">mem_objects</code> have
completed.
If the
<a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a>
extension is supported and the EGL context in question supports fence
sync objects, <span class="emphasis"><em>explicit synchronisation</em></span> can be achieved
as set out in section 5.7.1.
If the
<a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a>
extension is not supported, completion of EGL client API commands
may be determined by issuing and waiting for completion of commands such as
<code class="function">glFinish</code> or
<code class="function">vgFinish</code> on all client API
contexts with pending references to these objects. Some
implementations may offer other efficient
synchronization methods. If such methods exist they
will be described in platform-specific documentation.
Note that no synchronization methods other than
<code class="function">glFinish</code> and <code class="function">vgFinish</code>
are portable between all
EGL client API implementations and all OpenCL
implementations. While this is the only way to
ensure completion that is portable to all platforms,
these are expensive operation and their use
should be avoided if the
<a class="citerefentry" href="cl_khr_egl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_egl_event</span></span></a> extension
is supported on a platform.
</p>
<p>
Similarly, after calling
<code class="function">clEnqueueReleaseGLObjects</code>, the application is responsible
for ensuring that any pending OpenCL operations which access the objects specified
in <code class="varname">mem_objects</code> have completed prior to executing subsequent GL
commands which reference these objects. This may be accomplished portably by calling
<a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a> with the
event object returned by <code class="function">clEnqueueReleaseGLObjects</code>, or by calling
<a class="citerefentry" href="clFinish.html"><span class="citerefentry"><span class="refentrytitle">clFinish</span></span></a>. As above, some
implementations may offer more efficient methods.
</p>
<p>
The application is responsible for maintaining the proper order
of operations if the CL and GL contexts are in separate threads.
</p>
<p>
If a GL context is bound to a thread other than the one in which
<code class="function">clEnqueueReleaseGLObjects</code> is called, changes to any of the objects in
<code class="varname">mem_objects</code> may not be visible to that context without additional steps
being taken by the application. For an OpenGL 3.1 (or later) context, the requirements
are described in Appendix D ("Shared Objects and Multiple Contexts") of the OpenGL 3.1
Specification. For prior versions of OpenGL, the requirements are implementation-dependent.
</p>
<p>
Attempting to access the data store of an OpenGL object after
it has been acquired by OpenCL and before it has been released will result in undefined
behavior. Similarly, attempting to access a shared CL/GL object from OpenCL before it
has been acquired by the OpenCL command queue, or after it has been released, will result
in undefined behavior.
</p>
<p>
If the
<a class="citerefentry" href="cl_khr_gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</span></span></a> extension
is supported, then the OpenCL implementation will ensure that any such pending OpenGL
operations are complete for an OpenGL context bound to the same thread as the OpenCL
context. This is referred to as implicit synchronization.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns a valid non-zero OpenCL image object and <code class="varname">errcode_ret</code>
is set to <span class="errorname">CL_SUCCESS</span> if the 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 or was not created from a GL 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 value specified in
<code class="varname">texture_target</code> is not one of the values specified in the
description of <code class="varname">texture_target</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MIP_LEVEL</span> if <code class="varname">miplevel</code>
is less than the value of <code class="varname">level<sub>base</sub></code>
(for OpenGL implementations) or zero (for OpenGL ES implementations); or
greater than the value of <code class="varname">q</code> (for both OpenGL and OpenGL
ES). <code class="varname">level<sub>base</sub></code> and <code class="varname">q</code>
are defined for the texture in section 3.8.10 (Texture Completeness) of the OpenGL
2.1 specification and section 3.7.10 of the OpenGL ES 2.0.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MIP_LEVEL</span> if <code class="varname">miplevel</code> is
greater than zero and the OpenGL implementation does not support creating from
non-zero mipmap levels.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GL_OBJECT</span> if <code class="varname">texture</code> is not
a GL texture object whose type matches <code class="varname">texture_target</code>, if the
specified <code class="varname">miplevel</code> of <code class="varname">texture</code> is not defined,
or if the width or height of the specified <code class="varname">miplevel</code> is zero
or if the GL texture object is incomplete.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_FORMAT_DESCRIPTOR</span> if the OpenGL texture
internal format does not map to a supported OpenCL image format.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if <code class="varname">texture</code> is a GL texture object
created with a border width value greater than zero.
</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=clCreateFromGLTexture" 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_gl_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_sharing</span></span></a>,
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>,
<a class="citerefentry" href="clCreateFromGLBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLBuffer</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" />Copyright © 2007-2015 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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