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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>
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