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    <title>clCreateFromGLTexture3D</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="clCreateFromGLTexture3D"></a>
        <h1>clCreateFromGLTexture3D</h1>
        <p>
            Creates an OpenCL 3D image object from an OpenGL 3D 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">                   
                        clCreateFromGLTexture3D
                    </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 3D 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
<code class="function"><a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a></code>
for a description of <code class="varname">flags</code>. Only the valuesCL_MEM_READ_ONLY, CL_MEM_WRITE_ONLY and CL_MEM_READ_WRITE  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>
is used only to define the image type of <code class="varname">texture</code>. Must be GL_TEXTURE_3D. No reference to a bound GL texture object
is made or implied by this parameter.

                   </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        miplevel
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        The mipmap level to be used.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        texture
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        The name of a GL 3D 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 3D 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
<span class="type"><a class="citerefentry" href="cl_image_format.html"><span class="citerefentry"><span class="refentrytitle">cl_image_format</span></span></a></span>
can be used to create the 3D 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="description"></a>
        <h2>Description</h2>
        <p>
If the state of a GL texture object is modified through the GL API (e.g. the OpenGL functions
<code class="function">glTexImage2D</code> or <code class="function">glTexImage3D</code>, 
or the values of the texture parameters GL_TEXTURE_BASE_LEVEL or
GL_TEXTURE_MAX_LEVEL 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"><code class="function">clRetainMemObject</code></span></span></a>
and
<a class="citerefentry" href="clReleaseMemObject.html"><span class="citerefentry"><span class="refentrytitle"><code class="function">clReleaseMemObject</code></span></span></a>
functions can be used to retain and release
the image objects.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
OpenCL 1.0 supports read-only 3D image memory objects. Writes to 3D image objects that are GL 3D textures
are supported if the OpenCL implementation supports the <a class="citerefentry" href="cl_khr_3d_image_writes.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_3d_image_writes</span></span></a> extension. 3D images
are optional in the embedded profile. If 3D images are not supported by the OpenCL embedded profile, the
<code class="varname">errcode_ret</code> argument to <code class="function">clCreateFromGLTexture3D</code> will return CL_INVALID_OPERATION.
        </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_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.
            </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=282" 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="clCreateFromGLTexture2D.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromGLTexture2D</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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