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| <title>clGetExtensionFunctionAddress</title> |
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| <body> |
| <div class="refentry"> |
| <a id="idm1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clGetExtensionFunctionAddress"></a> |
| <h1>clGetExtensionFunctionAddress</h1> |
| <p> |
| Returns the address of the extension function named by <code xmlns="http://www.w3.org/1999/xhtml" class="varname">funcname</code>. |
| </p> |
| </div> |
| <div class="refsynopsisdiv"> |
| <h2></h2> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
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| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <strong class="fsfunc"> |
| clGetExtensionFunctionAddress |
| </strong> |
| (</code> |
| <td> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">funcname</var><code>)</code></td> |
| </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"> |
| funcname |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Name of an extension function. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The macro <code class="function">clGetExtensionFunctionAddress</code> |
| returns the address of the extension function named by <code class="varname">funcname</code>. The pointer returned should be cast to a function pointer type matching the extension function's definition defined in the |
| appropriate extension specification and header file. A return value of NULL indicates that the |
| specified function does not exist for the implementation. A non-NULL return value for |
| <code class="function">clGetExtensionFunctionAddress</code> does not guarantee that an extension function is actually supported. The application must also make a corresponding query using |
| <a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>(platform, <code class="constant">CL_PLATFORM_EXTENSIONS</code>, ... ) or <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>(device, |
| <code class="constant">CL_DEVICE_EXTENSIONS</code>, ... ) to determine if an extension is supported by the OpenCL |
| implementation. |
| </p> |
| <p> |
| <code class="function">clGetExtensionFunctionAddress</code> may not be queried for core (non-extension) functions in OpenCL. For functions that are queryable with <code class="function">clGetExtensionFunctionAddress</code>, |
| implementations may choose to also export those functions statically from the object libraries |
| implementing those functions. However, portable applications cannot rely on this behavior. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| Since there is no way to qualify the query with a device, the function pointer returned must work for all implementations of that extension on different devices. The behavior of calling a device extension function on a device not supporting that extension is undefined. |
| </p> |
| </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=224" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</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 |
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| in all copies or substantial portions of the Materials. |
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