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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <title xmlns:xlink="http://www.w3.org/1999/xlink">eglQueryContext - EGL Reference Pages</title>
+ <link rel="stylesheet" type="text/css" href="khronos-man.css"/>
+ <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"/>
+ </head>
+ <body>
+ <header/>
+ <div class="refentry" id="eglQueryContext">
+ <div class="titlepage"/>
+ <div class="refnamediv">
+ <h2>Name</h2>
+ <p>eglQueryContext —
+ return <abbr class="acronym">EGL</abbr> rendering context information
+ </p>
+ </div>
+ <div class="refsynopsisdiv">
+ <h2>C Specification</h2>
+ <div class="funcsynopsis">
+ <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
+ <tr>
+ <td>
+ <code class="funcdef">EGLBoolean <strong class="fsfunc">eglQueryContext</strong>(</code>
+ </td>
+ <td>EGLDisplay <var class="pdparam">display</var>, </td>
+ </tr>
+ <tr>
+ <td> </td>
+ <td>EGLContext <var class="pdparam">context</var>, </td>
+ </tr>
+ <tr>
+ <td> </td>
+ <td>EGLint <var class="pdparam">attribute</var>, </td>
+ </tr>
+ <tr>
+ <td> </td>
+ <td>EGLint * <var class="pdparam">value</var><code>)</code>;</td>
+ </tr>
+ </table>
+ <div class="funcprototype-spacer"> </div>
+ </div>
+ </div>
+ <div class="refsect1" id="parameters">
+ <h2>Parameters</h2>
+ <div class="variablelist">
+ <dl class="variablelist">
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>display</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the EGL display connection.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>context</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the EGL rendering context to query.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>attribute</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the EGL rendering context attribute to be returned.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>value</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Returns the requested value.
+ </p>
+ </dd>
+ </dl>
+ </div>
+ </div>
+ <div class="refsect1" id="description">
+ <h2>Description</h2>
+ <p>
+ <code class="function">eglQueryContext</code> returns in
+ <em class="parameter"><code>value</code></em> the value of
+ <em class="parameter"><code>attribute</code></em> for <em class="parameter"><code>context</code></em>.
+ <em class="parameter"><code>attribute</code></em> can be one of the following:
+ </p>
+ <div class="variablelist">
+ <dl class="variablelist">
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_CONFIG_ID</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Returns the ID of the EGL frame buffer configuration
+ with respect to which the context was created.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_CONTEXT_CLIENT_TYPE</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Returns the type of client API which the context
+ supports (one of
+ <code class="constant">EGL_OPENGL_API</code>,
+ <code class="constant">EGL_OPENGL_ES_API</code>, or
+ <code class="constant">EGL_OPENVG_API</code>).
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Returns the version of the client API which the
+ context supports, as specified at context creation
+ time. The resulting value is only meaningful for an
+ OpenGL ES context.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_RENDER_BUFFER</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Returns the buffer which client API rendering
+ via the context will use. The value returned
+ depends on properties of both the context, and
+ the surface to which the context is bound:
+ </p>
+ <div class="itemizedlist">
+ <ul style="list-style-type: disc; " class="itemizedlist">
+ <li class="listitem">
+ <p>
+ If the context is bound to a pixmap surface,
+ then <code class="constant">EGL_SINGLE_BUFFER</code> will
+ be returned.
+ </p>
+ </li>
+ <li class="listitem">
+ <p>
+ If the context is bound to a pbuffer surface,
+ then <code class="constant">EGL_BACK_BUFFER</code> will
+ be returned.
+ </p>
+ </li>
+ <li class="listitem">
+ <p>
+ If the context is bound to a window surface,
+ then either <code class="constant">EGL_BACK_BUFFER</code>
+ or <code class="constant">EGL_SINGLE_BUFFER</code> may be
+ returned. The value returned depends on both the
+ buffer requested by the setting of the
+ <code class="constant">EGL_RENDER_BUFFER</code> property
+ of the surface (which may be queried by calling
+ <code class="function">eglQuerySurface</code>), and on
+ the client API (not all client APIs support
+ single-buffer rendering to window surfaces).
+ </p>
+ </li>
+ <li class="listitem">
+ <p>
+ If the context is not bound to a surface, such
+ as an OpenGL ES context bound to a framebuffer
+ object, then <code class="constant">EGL_NONE</code> will
+ be returned.
+ </p>
+ </li>
+ </ul>
+ </div>
+ </dd>
+ </dl>
+ </div>
+ </div>
+ <div class="refsect1" id="notes">
+ <h2>Notes</h2>
+ <p>
+ Attributes <code class="constant">EGL_CONTEXT_CLIENT_TYPE</code> and
+ <code class="constant">EGL_RENDER_BUFFER</code> are supported only if
+ the EGL version is 1.2 or greater.
+ </p>
+ <p>
+ Attribute <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code> is
+ supported only if the EGL version is 1.3 or greater.
+ </p>
+ </div>
+ <div class="refsect1" id="errors">
+ <h2>Errors</h2>
+ <p>
+ <code class="constant">EGL_FALSE</code> is returned on failure,
+ <code class="constant">EGL_TRUE</code> otherwise.
+ <em class="parameter"><code>value</code></em> is not modified when
+ <code class="constant">EGL_FALSE</code> is returned.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_DISPLAY</code> is generated if
+ <em class="parameter"><code>display</code></em> is not an EGL display connection.
+ </p>
+ <p>
+ <code class="constant">EGL_NOT_INITIALIZED</code> is generated if
+ <em class="parameter"><code>display</code></em> has not been initialized.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_CONTEXT</code> is generated if
+ <em class="parameter"><code>context</code></em> is not an EGL rendering context.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
+ <em class="parameter"><code>attribute</code></em> is not a valid context attribute.
+ </p>
+ </div>
+ <div class="refsect1" id="seealso">
+ <h2>See Also</h2>
+ <p>
+ <a class="citerefentry" href="eglCreateContext.xhtml"><span class="citerefentry"><span class="refentrytitle">eglCreateContext</span></span></a>
+ </p>
+ </div>
+ <p>
+ </p>
+ <div class="refsect3" id="copyright">
+ <img src="KhronosLogo.jpg"/>
+ <p>
+ Copyright © 2003-2014 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.
+ </p>
+ </div>
+ <p>
+</p>
+ </div>
+ <footer/>
+ </body>
+</html>
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