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    <title>clCreateFromGLTexture2D</title>
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    <div class="refentry">
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      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateFromGLTexture2D"></a>
        <h1>clCreateFromGLTexture2D</h1>
        <p>
            Creates an OpenCL 2D image object from an OpenGL 2D texture 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">
                        cl_mem
                    <strong class="fsfunc">                   
                        clCreateFromGLTexture2D
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">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="_top">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="_top">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 at
<a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle"><code class="function">clCreateBuffer</code></span></span></a>
for a description of flags. Only CL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY and CL_MEM_READ_WRITE
values specified in the table at <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle"><code class="function">clCreateBuffer</code></span></span></a>
may be used.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        texture_target
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        Must be one of GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_TEXTURE_RECTANGLE. <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>
Using GL_TEXTURE_RECTANGLE for texture_target requires OpenGL 3.1. Alternatively, GL_TEXTURE_RECTANGLE_ARB may be specified if the OpenGL extension GL_ARB_texture_rectangle is supported.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        miplevel
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        The mipmap level to be used. Implementations may return CL_INVALID_OPERATION for miplevel values greater than 0.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        texture
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        The name of a GL 2D, cubemap or rectangle 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 2D image object. Only GL texture objects with an internal format that maps to appropriate image channel order and data type specified in the table of supported Image Channel Order Values and the table of supported Image Channel Data Types at <a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle"><span class="type">cl_image_format</span></span></span></a> may be used to create a 2D image 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="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_MIPLEVEL</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 specification.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MIPLEVEL</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.
            </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_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-1.0.pdf#page=281" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>, 
            <a class="citerefentry" href="clCreateFromGLTexture3D.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLTexture3D</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 © 2007-2009 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. 
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