102f4aeb0Sopenharmony_ci<?xml version="1.0" encoding="UTF-8" standalone="no"?> 202f4aeb0Sopenharmony_ci<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"> 302f4aeb0Sopenharmony_ci <head> 402f4aeb0Sopenharmony_ci <title xmlns:xlink="http://www.w3.org/1999/xlink">eglGetProcAddress - EGL Reference Pages</title> 502f4aeb0Sopenharmony_ci <link rel="stylesheet" type="text/css" href="khronos-man.css"/> 602f4aeb0Sopenharmony_ci <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"/> 702f4aeb0Sopenharmony_ci </head> 802f4aeb0Sopenharmony_ci <body> 902f4aeb0Sopenharmony_ci <header/> 1002f4aeb0Sopenharmony_ci <div class="refentry" id="eglGetProcAddress"> 1102f4aeb0Sopenharmony_ci <div class="titlepage"/> 1202f4aeb0Sopenharmony_ci <div class="refnamediv"> 1302f4aeb0Sopenharmony_ci <h2>Name</h2> 1402f4aeb0Sopenharmony_ci <p>eglGetProcAddress — 1502f4aeb0Sopenharmony_ci return a <abbr class="acronym">GL</abbr> or an <abbr class="acronym">EGL</abbr> 1602f4aeb0Sopenharmony_ci extension function 1702f4aeb0Sopenharmony_ci </p> 1802f4aeb0Sopenharmony_ci </div> 1902f4aeb0Sopenharmony_ci <div class="refsynopsisdiv"> 2002f4aeb0Sopenharmony_ci <h2>C Specification</h2> 2102f4aeb0Sopenharmony_ci <div class="funcsynopsis"> 2202f4aeb0Sopenharmony_ci <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table"> 2302f4aeb0Sopenharmony_ci <tr> 2402f4aeb0Sopenharmony_ci <td> 2502f4aeb0Sopenharmony_ci <code class="funcdef">void (* <strong class="fsfunc">eglGetProcAddress</strong>(</code> 2602f4aeb0Sopenharmony_ci </td> 2702f4aeb0Sopenharmony_ci <td>char const * <var class="pdparam">procname</var>))(void<code>)</code>;</td> 2802f4aeb0Sopenharmony_ci </tr> 2902f4aeb0Sopenharmony_ci </table> 3002f4aeb0Sopenharmony_ci <div class="funcprototype-spacer"> </div> 3102f4aeb0Sopenharmony_ci </div> 3202f4aeb0Sopenharmony_ci </div> 3302f4aeb0Sopenharmony_ci <div class="refsect1" id="parameters"> 3402f4aeb0Sopenharmony_ci <h2>Parameters</h2> 3502f4aeb0Sopenharmony_ci <div class="variablelist"> 3602f4aeb0Sopenharmony_ci <dl class="variablelist"> 3702f4aeb0Sopenharmony_ci <dt> 3802f4aeb0Sopenharmony_ci <span class="term"> 3902f4aeb0Sopenharmony_ci <em class="parameter"> 4002f4aeb0Sopenharmony_ci <code>procname</code> 4102f4aeb0Sopenharmony_ci </em> 4202f4aeb0Sopenharmony_ci </span> 4302f4aeb0Sopenharmony_ci </dt> 4402f4aeb0Sopenharmony_ci <dd> 4502f4aeb0Sopenharmony_ci <p> 4602f4aeb0Sopenharmony_ci Specifies the name of the function to return. 4702f4aeb0Sopenharmony_ci </p> 4802f4aeb0Sopenharmony_ci </dd> 4902f4aeb0Sopenharmony_ci </dl> 5002f4aeb0Sopenharmony_ci </div> 5102f4aeb0Sopenharmony_ci </div> 5202f4aeb0Sopenharmony_ci <div class="refsect1" id="description"> 5302f4aeb0Sopenharmony_ci <h2>Description</h2> 5402f4aeb0Sopenharmony_ci <p> 5502f4aeb0Sopenharmony_ci <code class="function">eglGetProcAddress</code> returns the address of 5602f4aeb0Sopenharmony_ci the client API or EGL function named by 5702f4aeb0Sopenharmony_ci <em class="parameter"><code>procname</code></em>. <em class="parameter"><code>procname</code></em> 5802f4aeb0Sopenharmony_ci must be a null-terminated string. The pointer returned should be 5902f4aeb0Sopenharmony_ci cast to a function pointer matching the function's definition in 6002f4aeb0Sopenharmony_ci the corresponding API or extension specification. A return value 6102f4aeb0Sopenharmony_ci of <code class="constant">NULL</code> indicates that the specific 6202f4aeb0Sopenharmony_ci function does not exist for the implementation. 6302f4aeb0Sopenharmony_ci </p> 6402f4aeb0Sopenharmony_ci <p> 6502f4aeb0Sopenharmony_ci A non-<code class="constant">NULL</code> return value does not guarantee 6602f4aeb0Sopenharmony_ci that an extension function is actually supported at runtime. The 6702f4aeb0Sopenharmony_ci client must also make a corresponding query, such as 6802f4aeb0Sopenharmony_ci <code class="function">glGetString</code>(<code class="constant">GL_EXTENSIONS</code>) 6902f4aeb0Sopenharmony_ci for OpenGL and OpenGL ES extensions; 7002f4aeb0Sopenharmony_ci <code class="function">vgGetString</code>(<code class="constant">VG_EXTENSIONS</code>) 7102f4aeb0Sopenharmony_ci for OpenVG extensions; 7202f4aeb0Sopenharmony_ci <code class="function">eglQueryString</code>(<em class="parameter"><code>display</code></em>, 7302f4aeb0Sopenharmony_ci <code class="constant">EGL_EXTENSIONS</code>); or query the EGL or client 7402f4aeb0Sopenharmony_ci API version for non-extension functions, to determine if a 7502f4aeb0Sopenharmony_ci function is supported by EGL or a specific client API context. 7602f4aeb0Sopenharmony_ci </p> 7702f4aeb0Sopenharmony_ci <p> 7802f4aeb0Sopenharmony_ci Client API function pointers returned by 7902f4aeb0Sopenharmony_ci <code class="function">eglGetProcAddress</code> are independent of the 8002f4aeb0Sopenharmony_ci display and the currently bound client API context, and may be 8102f4aeb0Sopenharmony_ci used by any client API context which supports the function. 8202f4aeb0Sopenharmony_ci </p> 8302f4aeb0Sopenharmony_ci <p> 8402f4aeb0Sopenharmony_ci <code class="function">eglGetProcAddress</code> may be queried for all 8502f4aeb0Sopenharmony_ci EGL and client API functions supported by the implementation 8602f4aeb0Sopenharmony_ci (whether those functions are extensions or not, and whether they 8702f4aeb0Sopenharmony_ci are supported by the current client API context or not). 8802f4aeb0Sopenharmony_ci </p> 8902f4aeb0Sopenharmony_ci <p> 9002f4aeb0Sopenharmony_ci For functions that are queryable with 9102f4aeb0Sopenharmony_ci <code class="function">eglGetProcAddress</code>, implementations may 9202f4aeb0Sopenharmony_ci choose to also export those functions statically from the object 9302f4aeb0Sopenharmony_ci libraries implementing those functions. However, portable 9402f4aeb0Sopenharmony_ci clients cannot rely on this behavior. 9502f4aeb0Sopenharmony_ci </p> 9602f4aeb0Sopenharmony_ci </div> 9702f4aeb0Sopenharmony_ci <div class="refsect1" id="notes"> 9802f4aeb0Sopenharmony_ci <h2>Notes</h2> 9902f4aeb0Sopenharmony_ci <p> 10002f4aeb0Sopenharmony_ci If the EGL version is not 1.5 or greater, only queries of EGL 10102f4aeb0Sopenharmony_ci and client API <span class="emphasis"><em>extension</em></span> functions will 10202f4aeb0Sopenharmony_ci succeed. 10302f4aeb0Sopenharmony_ci </p> 10402f4aeb0Sopenharmony_ci </div> 10502f4aeb0Sopenharmony_ci <div class="refsect1" id="seealso"> 10602f4aeb0Sopenharmony_ci <h2>See Also</h2> 10702f4aeb0Sopenharmony_ci <p> 10802f4aeb0Sopenharmony_ci <code class="function">glGetString</code> 10902f4aeb0Sopenharmony_ci <a class="citerefentry" href="eglQueryString.xhtml"><span class="citerefentry"><span class="refentrytitle">eglQueryString</span></span></a> </p> 11002f4aeb0Sopenharmony_ci <code class="function">vgGetString</code> 11102f4aeb0Sopenharmony_ci </div> 11202f4aeb0Sopenharmony_ci <p> 11302f4aeb0Sopenharmony_ci </p> 11402f4aeb0Sopenharmony_ci <div class="refsect3" id="copyright"> 11502f4aeb0Sopenharmony_ci <img src="KhronosLogo.jpg"/> 11602f4aeb0Sopenharmony_ci <p> 11702f4aeb0Sopenharmony_ci Copyright © 2003-2014 The Khronos Group Inc. 11802f4aeb0Sopenharmony_ci Permission is hereby granted, free of charge, to any person obtaining a 11902f4aeb0Sopenharmony_ci copy of this software and/or associated documentation files (the 12002f4aeb0Sopenharmony_ci "Materials"), to deal in the Materials without restriction, including 12102f4aeb0Sopenharmony_ci without limitation the rights to use, copy, modify, merge, publish, 12202f4aeb0Sopenharmony_ci distribute, sublicense, and/or sell copies of the Materials, and to 12302f4aeb0Sopenharmony_ci permit persons to whom the Materials are furnished to do so, subject to 12402f4aeb0Sopenharmony_ci the condition that this copyright notice and permission notice shall be included 12502f4aeb0Sopenharmony_ci in all copies or substantial portions of the Materials. 12602f4aeb0Sopenharmony_ci </p> 12702f4aeb0Sopenharmony_ci </div> 12802f4aeb0Sopenharmony_ci <p> 12902f4aeb0Sopenharmony_ci</p> 13002f4aeb0Sopenharmony_ci </div> 13102f4aeb0Sopenharmony_ci <footer/> 13202f4aeb0Sopenharmony_ci </body> 13302f4aeb0Sopenharmony_ci</html> 134
