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| <title>eglSwapBuffers</title> |
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| </head> |
| <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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