sdk/docs/man/xhtml/eglQueryContext.html - external/github.com/KhronosGroup/EGL-Registry - Git at Google

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 </style>
     <title>eglQueryContext</title>
     <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
   </head>
   <body>
     <div class="refentry">
       <a id="eglQueryContext"></a>
       <div class="titlepage"></div>
       <div xmlns="" class="refnamediv">
         <h1>eglQueryContext</h1>
         <p>
             return <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> rendering context information
         </p>
       </div>
       <div class="refsynopsisdiv">
         <h2>C Specification</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">EGLBoolean <strong class="fsfunc">eglQueryContext</strong>(</code>
                 <td>EGLDisplay  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">display</var>, </td>
               </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLContext  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLint  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attribute</var>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLint *  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">value</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">
                 <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">
         <a id="description"></a>
         <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 class="itemizedlist" style="list-style-type: disc; ">
                   <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">
         <a id="notes"></a>
         <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">
         <a id="errors"></a>
         <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">
         <a id="seealso"></a>
         <h2>See Also</h2>
         <p>
             <a class="citerefentry" href="eglCreateContext.html"><span class="citerefentry"><span class="refentrytitle">eglCreateContext</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 © 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.
 </div>
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	<title>eglQueryContext</title>
	<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
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	<body>
	<div class="refentry">
	<a id="eglQueryContext"></a>
	<div class="titlepage"></div>
	<div xmlns="" class="refnamediv">
	<h1>eglQueryContext</h1>
	<p>
	return <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> rendering context information
	</p>
	</div>
	<div class="refsynopsisdiv">
	<h2>C Specification</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">EGLBoolean <strong class="fsfunc">eglQueryContext</strong>(</code>
	<td>EGLDisplay <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">display</var>, </td>
	</td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLContext <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attribute</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLint * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">value</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">
	<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">
	<a id="description"></a>
	<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 class="itemizedlist" style="list-style-type: disc; ">
	<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">
	<a id="notes"></a>
	<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">
	<a id="errors"></a>
	<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">
	<a id="seealso"></a>
	<h2>See Also</h2>
	<p>
	<a class="citerefentry" href="eglCreateContext.html"><span class="citerefentry"><span class="refentrytitle">eglCreateContext</span></span></a>
	</p>
	</div>
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	Copyright © 2003-2014 The Khronos Group Inc.
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	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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