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

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 </style>
     <title>eglCreateContext</title>
     <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
   </head>
   <body>
     <div class="refentry">
       <a id="eglCreateContext"></a>
       <div class="titlepage"></div>
       <div xmlns="" class="refnamediv">
         <h1>eglCreateContext</h1>
         <p>
             create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> rendering context
         </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">EGLContext <strong class="fsfunc">eglCreateContext</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>EGLConfig  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">config</var>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLContext  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">share_context</var>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLint const *  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attrib_list</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
                     <acronym class="acronym">EGL</acronym>
                     display connection.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <em class="parameter">
                   <code>config</code>
                 </em>
               </span>
             </dt>
             <dd>
               <p>Specifies the EGL frame buffer configuration that
                     defines the frame buffer resource available to the rendering context.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <em class="parameter">
                   <code>share_context</code>
                 </em>
               </span>
             </dt>
             <dd>
               <p>
                     Specifies another
                     <acronym class="acronym">EGL</acronym>
                     rendering context with which to share data, as
                     defined by the client API corresponding to the
                     contexts. Data is also shared with all other
                     contexts with which
                     <em class="parameter"><code>share_context</code></em> shares data.
                     <code class="constant">EGL_NO_CONTEXT</code> indicates that
                     no sharing is to take place.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <em class="parameter">
                   <code>attrib_list</code>
                 </em>
               </span>
             </dt>
             <dd>
               <p>
                     Specifies attributes and attribute values for the
                     context being created. Only the attribute
                     <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code> may
                     be specified.
                 </p>
             </dd>
           </dl>
         </div>
       </div>
       <div class="refsect1">
         <a id="description"></a>
         <h2>Description</h2>
         <p>
             <code class="function">eglCreateContext</code> creates an EGL
             rendering context for the current rendering API (as set with
             <code class="function">eglBindAPI</code>) and returns a handle to the
             context. The context can then be used to render into an EGL
             drawing surface. If <code class="function">eglCreateContext</code>
             fails to create a rendering context,
             <code class="constant">EGL_NO_CONTEXT</code> is returned.
         </p>
         <p>
             If <em class="parameter"><code>share_context</code></em> is not
             <code class="constant">EGL_NO_CONTEXT</code>, then all shareable data
             in the context (as defined by the client API specification
             for the current rendering API) are shared by context
             <em class="parameter"><code>share_context</code></em>, all other contexts
             <em class="parameter"><code>share_context</code></em> already shares with,
             and the newly created context. An arbitrary number of
             rendering contexts can share data. However, all rendering
             contexts that share data must themselves exist in the same
             address space. Two rendering contexts share an address space
             if both are owned by a single process.
         </p>
         <p>
             <em class="parameter"><code>attrib_list</code></em> specifies a list of
             attributes for the context. The list has the same structure
             as described for <code class="function">eglChooseConfig</code>. The
             attributes and attribute values which may be specified are
             as follows:
         </p>
         <div class="variablelist">
           <dl class="variablelist">
             <dt>
               <span class="term">
                 <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code>
               </span>
             </dt>
             <dd>
               <p>
                     Must be followed by an integer that determines which
                     version of an OpenGL ES context to create. A value
                     of 1 specifies creation of an OpenGL ES 1.x context.
                     An attribute value of 2 specifies creation of an
                     OpenGL ES 2.x context. The default value is 1. This
                     attribute can only be specified when creating a
                     OpenGL ES context (e.g. when the current rendering
                     API is <code class="constant">EGL_OPENGL_ES_API</code>).
                 </p>
             </dd>
           </dl>
         </div>
       </div>
       <div class="refsect1">
         <a id="notes"></a>
         <h2>Notes</h2>
         <p>
             The current rendering API is only respected if the EGL
             version is 1.2 or greater. Otherwise, an OpenGL ES context
             will always be created.
         </p>
         <p>
             The <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code>
             attribute is only supported if the EGL version is 1.3 or
             greater.
         </p>
         <p>
             A <em class="firstterm">process</em> is a single execution environment,
             implemented in a single address space, consisting of one or more threads.
         </p>
         <p>
             A <em class="firstterm">thread</em> is one of a set of subprocesses that
             share a single address space, but maintain separate program counters,
             stack spaces, and other related global data.
             A thread is the only member of its subprocess group is equivalent to a
             process.
         </p>
       </div>
       <div class="refsect1">
         <a id="errors"></a>
         <h2>Errors</h2>
         <p>
             <code class="constant">EGL_NO_CONTEXT</code> is returned if creation of
             the context fails.
         </p>
         <p>
             <code class="constant">EGL_BAD_MATCH</code> is generated if the
             current rendering API is <code class="constant">EGL_NONE</code> (this
             can only arise in an EGL implementation which does not
             support OpenGL ES, prior to the first call to
             <code class="function">eglBindAPI</code>).
         </p>
         <p>
             <code class="constant">EGL_BAD_MATCH</code> is generated if the
             server context state for
             <em class="parameter"><code>share_context</code></em> exists in an address
             space which cannot be shared with the newly created context,
             if <em class="parameter"><code>share_context</code></em> was created on a
             different display than the one referenced by
             <em class="parameter"><code>config</code></em>, or if the contexts are
             otherwise incompatible.
         </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_CONFIG</code> is generated if
             <em class="parameter"><code>config</code></em> is not an EGL frame buffer
             configuration, or does not support the current rendering
             API. This includes requesting creation of an OpenGL ES 1.x
             context when the <code class="constant">EGL_RENDERABLE_TYPE</code>
             attribute of <em class="parameter"><code>config</code></em> does not contain
             <code class="constant">EGL_OPENGL_ES_BIT</code>, or creation of an
             OpenGL ES 2.x context when the attribute does not contain
             <code class="constant">EGL_OPENGL_ES2_BIT</code>.
         </p>
         <p>
             <code class="constant">EGL_BAD_CONTEXT</code> is generated if
             <em class="parameter"><code>share_context</code></em> is not an EGL rendering
             context of the same client API type as the newly created
             context and is not <code class="constant">EGL_NO_CONTEXT</code>.
         </p>
         <p>
             <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
             <em class="parameter"><code>attrib_list</code></em> contains an invalid
             context attribute or if an attribute is not recognized or
             out of range. Note that attribute
             <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code> is
             only valid when the current rendering API is
             <code class="constant">EGL_OPENGL_ES_API</code>.
         </p>
         <p>
             <code class="constant">EGL_BAD_ALLOC</code> is generated if there are not
             enough resources to allocate the new context.
         </p>
       </div>
       <div class="refsect1">
         <a id="seealso"></a>
         <h2>See Also</h2>
         <p>
             <a class="citerefentry" href="eglDestroyContext.html"><span class="citerefentry"><span class="refentrytitle">eglDestroyContext</span></span></a>,
             <a class="citerefentry" href="eglChooseConfig.html"><span class="citerefentry"><span class="refentrytitle">eglChooseConfig</span></span></a>,
             <a class="citerefentry" href="eglGetConfigs.html"><span class="citerefentry"><span class="refentrytitle">eglGetConfigs</span></span></a>,
             <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</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>eglCreateContext</title>
	<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
	</head>
	<body>
	<div class="refentry">
	<a id="eglCreateContext"></a>
	<div class="titlepage"></div>
	<div xmlns="" class="refnamediv">
	<h1>eglCreateContext</h1>
	<p>
	create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> rendering context
	</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">EGLContext <strong class="fsfunc">eglCreateContext</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>EGLConfig <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">config</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLContext <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">share_context</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLint const * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attrib_list</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
	<acronym class="acronym">EGL</acronym>
	display connection.
	</p>
	</dd>
	<dt>
	<span class="term">
	<em class="parameter">
	<code>config</code>
	</em>
	</span>
	</dt>
	<dd>
	<p>Specifies the EGL frame buffer configuration that
	defines the frame buffer resource available to the rendering context.
	</p>
	</dd>
	<dt>
	<span class="term">
	<em class="parameter">
	<code>share_context</code>
	</em>
	</span>
	</dt>
	<dd>
	<p>
	Specifies another
	<acronym class="acronym">EGL</acronym>
	rendering context with which to share data, as
	defined by the client API corresponding to the
	contexts. Data is also shared with all other
	contexts with which
	<em class="parameter"><code>share_context</code></em> shares data.
	<code class="constant">EGL_NO_CONTEXT</code> indicates that
	no sharing is to take place.
	</p>
	</dd>
	<dt>
	<span class="term">
	<em class="parameter">
	<code>attrib_list</code>
	</em>
	</span>
	</dt>
	<dd>
	<p>
	Specifies attributes and attribute values for the
	context being created. Only the attribute
	<code class="constant">EGL_CONTEXT_CLIENT_VERSION</code> may
	be specified.
	</p>
	</dd>
	</dl>
	</div>
	</div>
	<div class="refsect1">
	<a id="description"></a>
	<h2>Description</h2>
	<p>
	<code class="function">eglCreateContext</code> creates an EGL
	rendering context for the current rendering API (as set with
	<code class="function">eglBindAPI</code>) and returns a handle to the
	context. The context can then be used to render into an EGL
	drawing surface. If <code class="function">eglCreateContext</code>
	fails to create a rendering context,
	<code class="constant">EGL_NO_CONTEXT</code> is returned.
	</p>
	<p>
	If <em class="parameter"><code>share_context</code></em> is not
	<code class="constant">EGL_NO_CONTEXT</code>, then all shareable data
	in the context (as defined by the client API specification
	for the current rendering API) are shared by context
	<em class="parameter"><code>share_context</code></em>, all other contexts
	<em class="parameter"><code>share_context</code></em> already shares with,
	and the newly created context. An arbitrary number of
	rendering contexts can share data. However, all rendering
	contexts that share data must themselves exist in the same
	address space. Two rendering contexts share an address space
	if both are owned by a single process.
	</p>
	<p>
	<em class="parameter"><code>attrib_list</code></em> specifies a list of
	attributes for the context. The list has the same structure
	as described for <code class="function">eglChooseConfig</code>. The
	attributes and attribute values which may be specified are
	as follows:
	</p>
	<div class="variablelist">
	<dl class="variablelist">
	<dt>
	<span class="term">
	<code class="constant">EGL_CONTEXT_CLIENT_VERSION</code>
	</span>
	</dt>
	<dd>
	<p>
	Must be followed by an integer that determines which
	version of an OpenGL ES context to create. A value
	of 1 specifies creation of an OpenGL ES 1.x context.
	An attribute value of 2 specifies creation of an
	OpenGL ES 2.x context. The default value is 1. This
	attribute can only be specified when creating a
	OpenGL ES context (e.g. when the current rendering
	API is <code class="constant">EGL_OPENGL_ES_API</code>).
	</p>
	</dd>
	</dl>
	</div>
	</div>
	<div class="refsect1">
	<a id="notes"></a>
	<h2>Notes</h2>
	<p>
	The current rendering API is only respected if the EGL
	version is 1.2 or greater. Otherwise, an OpenGL ES context
	will always be created.
	</p>
	<p>
	The <code class="constant">EGL_CONTEXT_CLIENT_VERSION</code>
	attribute is only supported if the EGL version is 1.3 or
	greater.
	</p>
	<p>
	A <em class="firstterm">process</em> is a single execution environment,
	implemented in a single address space, consisting of one or more threads.
	</p>
	<p>
	A <em class="firstterm">thread</em> is one of a set of subprocesses that
	share a single address space, but maintain separate program counters,
	stack spaces, and other related global data.
	A thread is the only member of its subprocess group is equivalent to a
	process.
	</p>
	</div>
	<div class="refsect1">
	<a id="errors"></a>
	<h2>Errors</h2>
	<p>
	<code class="constant">EGL_NO_CONTEXT</code> is returned if creation of
	the context fails.
	</p>
	<p>
	<code class="constant">EGL_BAD_MATCH</code> is generated if the
	current rendering API is <code class="constant">EGL_NONE</code> (this
	can only arise in an EGL implementation which does not
	support OpenGL ES, prior to the first call to
	<code class="function">eglBindAPI</code>).
	</p>
	<p>
	<code class="constant">EGL_BAD_MATCH</code> is generated if the
	server context state for
	<em class="parameter"><code>share_context</code></em> exists in an address
	space which cannot be shared with the newly created context,
	if <em class="parameter"><code>share_context</code></em> was created on a
	different display than the one referenced by
	<em class="parameter"><code>config</code></em>, or if the contexts are
	otherwise incompatible.
	</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_CONFIG</code> is generated if
	<em class="parameter"><code>config</code></em> is not an EGL frame buffer
	configuration, or does not support the current rendering
	API. This includes requesting creation of an OpenGL ES 1.x
	context when the <code class="constant">EGL_RENDERABLE_TYPE</code>
	attribute of <em class="parameter"><code>config</code></em> does not contain
	<code class="constant">EGL_OPENGL_ES_BIT</code>, or creation of an
	OpenGL ES 2.x context when the attribute does not contain
	<code class="constant">EGL_OPENGL_ES2_BIT</code>.
	</p>
	<p>
	<code class="constant">EGL_BAD_CONTEXT</code> is generated if
	<em class="parameter"><code>share_context</code></em> is not an EGL rendering
	context of the same client API type as the newly created
	context and is not <code class="constant">EGL_NO_CONTEXT</code>.
	</p>
	<p>
	<code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
	<em class="parameter"><code>attrib_list</code></em> contains an invalid
	context attribute or if an attribute is not recognized or
	out of range. Note that attribute
	<code class="constant">EGL_CONTEXT_CLIENT_VERSION</code> is
	only valid when the current rendering API is
	<code class="constant">EGL_OPENGL_ES_API</code>.
	</p>
	<p>
	<code class="constant">EGL_BAD_ALLOC</code> is generated if there are not
	enough resources to allocate the new context.
	</p>
	</div>
	<div class="refsect1">
	<a id="seealso"></a>
	<h2>See Also</h2>
	<p>
	<a class="citerefentry" href="eglDestroyContext.html"><span class="citerefentry"><span class="refentrytitle">eglDestroyContext</span></span></a>,
	<a class="citerefentry" href="eglChooseConfig.html"><span class="citerefentry"><span class="refentrytitle">eglChooseConfig</span></span></a>,
	<a class="citerefentry" href="eglGetConfigs.html"><span class="citerefentry"><span class="refentrytitle">eglGetConfigs</span></span></a>,
	<a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</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
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