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+</style>
+ <title>eglMakeCurrent</title>
+ <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
+ </head>
+ <body>
+ <div class="refentry">
+ <a id="eglMakeCurrent"></a>
+ <div class="titlepage"></div>
+ <div xmlns="" class="refnamediv">
+ <h1>eglMakeCurrent</h1>
+ <p>
+ attach an EGL rendering context to EGL surfaces
+ </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">eglMakeCurrent</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>EGLSurface  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">draw</var>, </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLSurface  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">read</var>, </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLContext  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</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>draw</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>Specifies the <acronym class="acronym">EGL</acronym> draw surface.</p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>read</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>Specifies the <acronym class="acronym">EGL</acronym> read surface.</p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>context</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>Specifies the <acronym class="acronym">EGL</acronym> rendering context
+ to be attached to the surfaces.
+ </p>
+ </dd>
+ </dl>
+ </div>
+ </div>
+ <div class="refsect1">
+ <a id="description"></a>
+ <h2>Description</h2>
+ <p>
+ <code class="function">eglMakeCurrent</code> binds <em class="parameter"><code>context</code></em>
+ to the current rendering thread and to the <em class="parameter"><code>draw</code></em>
+ and <em class="parameter"><code>read</code></em> surfaces. <em class="parameter"><code>draw</code></em>
+ is used for all GL operations except for any pixel data read back
+ (<a class="citerefentry" href="glReadPixels.html"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
+ <a class="citerefentry" href="glCopyTexImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>, and
+ <a class="citerefentry" href="glCopyTexSubImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>),
+ which is taken from the frame buffer values of
+ <em class="parameter"><code>read</code></em>.
+ </p>
+ <p>
+ If the calling thread has already a current rendering context, that
+ context is flushed and marked as no longer current.
+ </p>
+ <p>
+ The first time that <em class="parameter"><code>context</code></em> is made current,
+ the viewport and scissor dimensions are set to the size of the
+ <em class="parameter"><code>draw</code></em> surface. The viewport and
+ scissor are not modified when <em class="parameter"><code>context</code></em> is
+ subsequently made current.
+ </p>
+ <p>
+ To release the current context without assigning a new one, call
+ <code class="function">eglMakeCurrent</code> with <em class="parameter"><code>draw</code></em>
+ and <em class="parameter"><code>read</code></em> set to
+ <code class="constant">EGL_NO_SURFACE</code> and <em class="parameter"><code>context</code></em>
+ set to <code class="constant">EGL_NO_CONTEXT</code>.
+ </p>
+ <p>
+ Use
+ <a class="citerefentry" href="eglGetCurrentContext.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentContext</span></span></a>,
+ <a class="citerefentry" href="eglGetCurrentDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentDisplay</span></span></a>, and
+ <a class="citerefentry" href="eglGetCurrentSurface.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentSurface</span></span></a>
+ to query the current rendering context and associated display connection and surfaces.
+ </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. If <code class="constant">EGL_FALSE</code>
+ is returned, the previously current rendering context and
+ surfaces (if any) remain unchanged.
+ </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_SURFACE</code> is generated if
+ <em class="parameter"><code>draw</code></em> or <em class="parameter"><code>read</code></em> is not an
+ EGL surface.
+ </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_MATCH</code> is generated if
+ <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em>
+ are not compatible with
+ <em class="parameter"><code>context</code></em>, or if
+ <em class="parameter"><code>context</code></em> is set to
+ <code class="constant">EGL_NO_CONTEXT</code> and
+ <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em>
+ are not set to
+ <code class="constant">EGL_NO_SURFACE</code>, or if
+ <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em> are set to
+ <code class="constant">EGL_NO_SURFACE</code> and
+ <em class="parameter"><code>context</code></em> is not set to
+ <code class="constant">EGL_NO_CONTEXT</code>.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ACCESS</code> is generated if
+ <em class="parameter"><code>context</code></em>
+ is current to some other thread.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_NATIVE_PIXMAP</code> may be generated if
+ a native pixmap underlying either
+ <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em>
+ is no longer valid.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_NATIVE_WINDOW</code> may be generated if
+ a native window underlying either
+ <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em>
+ is no longer valid.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_CURRENT_SURFACE</code> is generated if
+ the previous context has unflushed commands and the previous surface
+ is no longer valid.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ALLOC</code> may be generated if
+ allocation of ancillary buffers for <em class="parameter"><code>draw</code></em> or
+ <em class="parameter"><code>read</code></em> were delayed until
+ <code class="function">eglMakeCurrent</code> is called, and there are not
+ enough resources to allocate them.
+ </p>
+ <p>
+ <code class="constant">EGL_CONTEXT_LOST</code> is generated if a power management
+ event has occurred. The application must destroy all contexts and
+ reinitialise OpenGL ES state and objects to continue rendering.
+ </p>
+ </div>
+ <div class="refsect1">
+ <a id="seealso"></a>
+ <h2>See Also</h2>
+ <p>
+ <a class="citerefentry" href="glReadPixels.html"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
+ <a class="citerefentry" href="glCopyTexImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>,
+ <a class="citerefentry" href="glCopyTexSubImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexSubImage2D</span></span></a>,
+ <a class="citerefentry" href="eglCreateContext.html"><span class="citerefentry"><span class="refentrytitle">eglCreateContext</span></span></a>,
+ <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>,
+ <a class="citerefentry" href="eglCreatePixmapSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePixmapSurface</span></span></a>,
+ <a class="citerefentry" href="eglCreateWindowSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreateWindowSurface</span></span></a>,
+ <a class="citerefentry" href="eglGetCurrentContext.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentContext</span></span></a>,
+ <a class="citerefentry" href="eglGetCurrentDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentDisplay</span></span></a>,
+ <a class="citerefentry" href="eglGetCurrentSurface.html"><span class="citerefentry"><span class="refentrytitle">eglGetCurrentSurface</span></span></a>,
+ <a class="citerefentry" href="eglGetDisplay.html"><span class="citerefentry"><span class="refentrytitle">eglGetDisplay</span></span></a>,
+ <a class="citerefentry" href="eglInitialize.html"><span class="citerefentry"><span class="refentrytitle">eglInitialize</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>
+ </div>
+ </body>
+</html>