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<title>eglSwapBuffers</title>
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<body>
<div class="refentry">
<a id="eglSwapBuffers"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<h1>eglSwapBuffers</h1>
<p>
post <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> surface color buffer to a native window
</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">eglSwapBuffers</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">surface</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>surface</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the EGL drawing surface whose buffers are to be swapped.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
If <em class="parameter"><code>surface</code></em> is a window surface,
<code class="function">eglSwapBuffers</code> posts its color buffer
to the associated native window.
</p>
<p>
The contents of ancillary buffers are always undefined after
calling <code class="function">eglSwapBuffers</code>. The contents of
the color buffer are left unchanged if the value of the
<code class="constant">EGL_SWAP_BEHAVIOR</code> attribute of
<em class="parameter"><code>surface</code></em> is
<code class="constant">EGL_BUFFER_PRESERVED</code>, and are undefined
if the value is <code class="constant">EGL_BUFFER_DESTROYED</code>.
The value of <code class="constant">EGL_SWAP_BEHAVIOR</code> can be
set for some surfaces using
<a class="citerefentry" href="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>.
</p>
<p>
<code class="function">eglSwapBuffers</code> performs an implicit
flush operation on the context (<code class="function">glFlush</code>
for an OpenGL ES or OpenGL context,
<code class="function">vgFlush</code> for an OpenVG context) bound to
<em class="parameter"><code>surface</code></em> before swapping. Subsequent
client API commands may be issued on that context
immediately after calling
<code class="function">eglSwapBuffers</code>, but are not executed
until the buffer exchange is completed.
</p>
<p>
If <em class="parameter"><code>surface</code></em> is a pixel buffer or a pixmap,
<code class="function">eglSwapBuffers</code>
has no effect, and no error is generated.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Attribute <code class="constant">EGL_SWAP_BEHAVIOR</code> is
supported only if the EGL version is 1.2 or greater. In
earlier versions, behavior is as though the attribute
exists, and always has the value
<code class="constant">EGL_BUFFER_DESTROYED</code>.
</p>
<p>
The EGL 1.4 specification was updated to acknowledge that
ancillary buffers are not necessarily preserved after a
swap, and that the <code class="constant">EGL_SWAP_BEHAVIOR</code>
attribute applies only to the color buffer. This change in
the specification acknowledged the behavior of many shipping
implementations, and is not intended to result in behavior
changes in any existing implementation. Applications which
require preservation of ancillary buffers across a swap
should be aware that not all implementations can preserve
them, and that EGL 1.4 has no way to query whether or not
they are preserved.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="constant">EGL_FALSE</code> is returned if swapping of the
surface buffers fails, <code class="constant">EGL_TRUE</code> otherwise.
</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>surface</code></em> is not an EGL drawing surface.
</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="glFlush.html"><span class="citerefentry"><span class="refentrytitle">glFlush</span></span></a>,
<a class="citerefentry" href="eglCopyBuffers.html"><span class="citerefentry"><span class="refentrytitle">eglCopyBuffers</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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