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

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     <title>eglQuerySurface</title>
     <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
   </head>
   <body>
     <div class="refentry">
       <a id="eglQuerySurface"></a>
       <div class="titlepage"></div>
       <div xmlns="" class="refnamediv">
         <h1>eglQuerySurface</h1>
         <p>
             return <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> surface information
         </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">eglQuerySurface</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>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLint  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attribute</var>, </td>
             </tr>
             <tr valign="top">
               <td> </td>
               <td>EGLint *  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">value</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 surface to query.
                     </p>
             </dd>
             <dt>
               <span class="term">
                 <em class="parameter">
                   <code>attribute</code>
                 </em>
               </span>
             </dt>
             <dd>
               <p>
                         Specifies the EGL surface attribute to be returned.
                     </p>
             </dd>
             <dt>
               <span class="term">
                 <em class="parameter">
                   <code>value</code>
                 </em>
               </span>
             </dt>
             <dd>
               <p>
                         Returns the requested value.
                     </p>
             </dd>
           </dl>
         </div>
       </div>
       <div class="refsect1">
         <a id="description"></a>
         <h2>Description</h2>
         <p>
             <code class="function">eglQuerySurface</code> returns in
             <em class="parameter"><code>value</code></em> the value of
             <em class="parameter"><code>attribute</code></em> for <em class="parameter"><code>surface</code></em>.
             <em class="parameter"><code>attribute</code></em> can be one of the following:
         </p>
         <div class="variablelist">
           <dl class="variablelist">
             <dt>
               <span class="term">
                 <code class="constant">EGL_CONFIG_ID</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the ID of the EGL frame buffer configuration
                     with respect to which the surface was created.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_HEIGHT</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the height of the surface in pixels.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_HORIZONTAL_RESOLUTION</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the horizontal dot pitch of the display on
                     which a window surface is visible. The value
                     returned is equal to the actual dot pitch, in
                     pixels/meter, multiplied by the constant value
                     <code class="constant">EGL_DISPLAY_SCALING</code>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_LARGEST_PBUFFER</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the same attribute value specified when the
                     surface was created with
                     <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>.
                     For a window or pixmap surface,
                     <em class="parameter"><code>value</code></em> is not modified.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_MIPMAP_LEVEL</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns which level of the mipmap to render to, if
                     texture has mipmaps.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_MIPMAP_TEXTURE</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns <code class="constant">EGL_TRUE</code> if texture has
                     mipmaps, <code class="constant">EGL_FALSE</code> otherwise.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_MULTISAMPLE_RESOLVE</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the filter used when resolving the
                     multisample buffer. The filter may be either
                     <code class="constant">EGL_MULTISAMPLE_RESOLVE_DEFAULT</code>
                     or <code class="constant">EGL_MULTISAMPLE_RESOLVE_BOX</code>,
                     as described for
                     <a class="citerefentry" href="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_PIXEL_ASPECT_RATIO</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the aspect ratio of an individual pixel (the
                     ratio of a pixel's width to its height). The value
                     returned is equal to the actual aspect ratio
                     multiplied by the constant value
                     <code class="constant">EGL_DISPLAY_SCALING</code>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_RENDER_BUFFER</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the buffer which client API rendering is
                     requested to use. For a window surface, this is the
                     same attribute value specified when the surface was
                     created. For a pbuffer surface, it is always
                     <code class="constant">EGL_BACK_BUFFER</code>. For a pixmap
                     surface, it is always
                     <code class="constant">EGL_SINGLE_BUFFER</code>. To determine
                     the actual buffer being rendered to by a context,
                     call
                     <a class="citerefentry" href="eglQueryContext.html"><span class="citerefentry"><span class="refentrytitle">eglQueryContext</span></span></a>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_SWAP_BEHAVIOR</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the effect on the color buffer when posting
                     a surface with
                     <a class="citerefentry" href="eglSwapBuffers.html"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a>.
                     Swap behavior may be either
                     <code class="constant">EGL_BUFFER_PRESERVED</code> or
                     <code class="constant">EGL_BUFFER_DESTROYED</code>, as
                     described for
                     <a class="citerefentry" href="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_TEXTURE_FORMAT</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns format of texture. Possible values are
                     <code class="constant">EGL_NO_TEXTURE</code>,
                     <code class="constant">EGL_TEXTURE_RGB</code>, and
                     <code class="constant">EGL_TEXTURE_RGBA</code>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_TEXTURE_TARGET</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns type of texture. Possible values are
                     <code class="constant">EGL_NO_TEXTURE</code>, or
                     <code class="constant">EGL_TEXTURE_2D</code>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_VERTICAL_RESOLUTION</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the vertical dot pitch of the display on
                     which a window surface is visible. The value
                     returned is equal to the actual dot pitch, in
                     pixels/meter, multiplied by the constant value
                     <code class="constant">EGL_DISPLAY_SCALING</code>.
                 </p>
             </dd>
             <dt>
               <span class="term">
                 <code class="constant">EGL_WIDTH</code>
               </span>
             </dt>
             <dd>
               <p>
                     Returns the width of the surface in pixels.
                 </p>
             </dd>
           </dl>
         </div>
       </div>
       <div class="refsect1">
         <a id="notes"></a>
         <h2>Notes</h2>
         <p>
             Attribute <code class="constant">EGL_MULTISAMPLE_RESOLVE</code> is
             supported only if the EGL version is 1.4 or greater.
         </p>
         <p>
             Attributes <code class="constant">EGL_DISPLAY_SCALING</code>.
             <code class="constant">EGL_HORIZONTAL_RESOLUTION</code>,
             <code class="constant">EGL_PIXEL_ASPECT_RATIO</code>,
             <code class="constant">EGL_RENDER_BUFFER</code>,
             <code class="constant">EGL_SWAP_BEHAVIOR</code>, and
             <code class="constant">EGL_VERTICAL_RESOLUTION</code> are supported
             only if the EGL version is 1.2 or greater.
         </p>
         <p>
             Querying attributes <code class="constant">EGL_TEXTURE_FORMAT</code>,
             <code class="constant">EGL_TEXTURE_TARGET</code>,
             <code class="constant">EGL_MIPMAP_TEXTURE</code>, or
             <code class="constant">EGL_MIPMAP_LEVEL</code> for a non-pbuffer
             surface is not an error, but <em class="parameter"><code>value</code></em> is
             not modified.
         </p>
         <p>
             <code class="constant">EGL_DISPLAY_SCALING</code> is the constant
             value 10000. Floating-point values such as resolution and
             pixel aspect ratio are scaled by this value before being
             returned as integers so that sufficient precision to be
             meaningful will be retained in the returned value.
         </p>
         <p>
             For an offscreen (pbuffer or pixmap) surface, or a surface
             whose pixel dot pitch or aspect ratio are unknown, querying
             <code class="constant">EGL_HORIZONTAL_RESOLUTION</code>,
             <code class="constant">EGL_PIXEL_ASPECT_RATIO</code>, or
             <code class="constant">EGL_VERTICAL_RESOLUTION</code> will return the
             constant value <code class="constant">EGL_UNKNOWN</code> (-1).
         </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.
             <em class="parameter"><code>value</code></em> is not modified when
             <code class="constant">EGL_FALSE</code> is returned.
         </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 surface.
         </p>
         <p>
             <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
             <em class="parameter"><code>attribute</code></em> is not a valid surface attribute.
         </p>
       </div>
       <div class="refsect1">
         <a id="seealso"></a>
         <h2>See Also</h2>
         <p>
             <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="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>,
             <a class="citerefentry" href="eglSwapBuffers.html"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</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.
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	</style>
	<title>eglQuerySurface</title>
	<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
	</head>
	<body>
	<div class="refentry">
	<a id="eglQuerySurface"></a>
	<div class="titlepage"></div>
	<div xmlns="" class="refnamediv">
	<h1>eglQuerySurface</h1>
	<p>
	return <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> surface information
	</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">eglQuerySurface</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>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLint <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attribute</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>EGLint * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">value</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 surface to query.
	</p>
	</dd>
	<dt>
	<span class="term">
	<em class="parameter">
	<code>attribute</code>
	</em>
	</span>
	</dt>
	<dd>
	<p>
	Specifies the EGL surface attribute to be returned.
	</p>
	</dd>
	<dt>
	<span class="term">
	<em class="parameter">
	<code>value</code>
	</em>
	</span>
	</dt>
	<dd>
	<p>
	Returns the requested value.
	</p>
	</dd>
	</dl>
	</div>
	</div>
	<div class="refsect1">
	<a id="description"></a>
	<h2>Description</h2>
	<p>
	<code class="function">eglQuerySurface</code> returns in
	<em class="parameter"><code>value</code></em> the value of
	<em class="parameter"><code>attribute</code></em> for <em class="parameter"><code>surface</code></em>.
	<em class="parameter"><code>attribute</code></em> can be one of the following:
	</p>
	<div class="variablelist">
	<dl class="variablelist">
	<dt>
	<span class="term">
	<code class="constant">EGL_CONFIG_ID</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the ID of the EGL frame buffer configuration
	with respect to which the surface was created.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_HEIGHT</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the height of the surface in pixels.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_HORIZONTAL_RESOLUTION</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the horizontal dot pitch of the display on
	which a window surface is visible. The value
	returned is equal to the actual dot pitch, in
	pixels/meter, multiplied by the constant value
	<code class="constant">EGL_DISPLAY_SCALING</code>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_LARGEST_PBUFFER</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the same attribute value specified when the
	surface was created with
	<a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>.
	For a window or pixmap surface,
	<em class="parameter"><code>value</code></em> is not modified.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_MIPMAP_LEVEL</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns which level of the mipmap to render to, if
	texture has mipmaps.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_MIPMAP_TEXTURE</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns <code class="constant">EGL_TRUE</code> if texture has
	mipmaps, <code class="constant">EGL_FALSE</code> otherwise.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_MULTISAMPLE_RESOLVE</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the filter used when resolving the
	multisample buffer. The filter may be either
	<code class="constant">EGL_MULTISAMPLE_RESOLVE_DEFAULT</code>
	or <code class="constant">EGL_MULTISAMPLE_RESOLVE_BOX</code>,
	as described for
	<a class="citerefentry" href="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_PIXEL_ASPECT_RATIO</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the aspect ratio of an individual pixel (the
	ratio of a pixel's width to its height). The value
	returned is equal to the actual aspect ratio
	multiplied by the constant value
	<code class="constant">EGL_DISPLAY_SCALING</code>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_RENDER_BUFFER</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the buffer which client API rendering is
	requested to use. For a window surface, this is the
	same attribute value specified when the surface was
	created. For a pbuffer surface, it is always
	<code class="constant">EGL_BACK_BUFFER</code>. For a pixmap
	surface, it is always
	<code class="constant">EGL_SINGLE_BUFFER</code>. To determine
	the actual buffer being rendered to by a context,
	call
	<a class="citerefentry" href="eglQueryContext.html"><span class="citerefentry"><span class="refentrytitle">eglQueryContext</span></span></a>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_SWAP_BEHAVIOR</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the effect on the color buffer when posting
	a surface with
	<a class="citerefentry" href="eglSwapBuffers.html"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a>.
	Swap behavior may be either
	<code class="constant">EGL_BUFFER_PRESERVED</code> or
	<code class="constant">EGL_BUFFER_DESTROYED</code>, as
	described for
	<a class="citerefentry" href="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_TEXTURE_FORMAT</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns format of texture. Possible values are
	<code class="constant">EGL_NO_TEXTURE</code>,
	<code class="constant">EGL_TEXTURE_RGB</code>, and
	<code class="constant">EGL_TEXTURE_RGBA</code>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_TEXTURE_TARGET</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns type of texture. Possible values are
	<code class="constant">EGL_NO_TEXTURE</code>, or
	<code class="constant">EGL_TEXTURE_2D</code>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_VERTICAL_RESOLUTION</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the vertical dot pitch of the display on
	which a window surface is visible. The value
	returned is equal to the actual dot pitch, in
	pixels/meter, multiplied by the constant value
	<code class="constant">EGL_DISPLAY_SCALING</code>.
	</p>
	</dd>
	<dt>
	<span class="term">
	<code class="constant">EGL_WIDTH</code>
	</span>
	</dt>
	<dd>
	<p>
	Returns the width of the surface in pixels.
	</p>
	</dd>
	</dl>
	</div>
	</div>
	<div class="refsect1">
	<a id="notes"></a>
	<h2>Notes</h2>
	<p>
	Attribute <code class="constant">EGL_MULTISAMPLE_RESOLVE</code> is
	supported only if the EGL version is 1.4 or greater.
	</p>
	<p>
	Attributes <code class="constant">EGL_DISPLAY_SCALING</code>.
	<code class="constant">EGL_HORIZONTAL_RESOLUTION</code>,
	<code class="constant">EGL_PIXEL_ASPECT_RATIO</code>,
	<code class="constant">EGL_RENDER_BUFFER</code>,
	<code class="constant">EGL_SWAP_BEHAVIOR</code>, and
	<code class="constant">EGL_VERTICAL_RESOLUTION</code> are supported
	only if the EGL version is 1.2 or greater.
	</p>
	<p>
	Querying attributes <code class="constant">EGL_TEXTURE_FORMAT</code>,
	<code class="constant">EGL_TEXTURE_TARGET</code>,
	<code class="constant">EGL_MIPMAP_TEXTURE</code>, or
	<code class="constant">EGL_MIPMAP_LEVEL</code> for a non-pbuffer
	surface is not an error, but <em class="parameter"><code>value</code></em> is
	not modified.
	</p>
	<p>
	<code class="constant">EGL_DISPLAY_SCALING</code> is the constant
	value 10000. Floating-point values such as resolution and
	pixel aspect ratio are scaled by this value before being
	returned as integers so that sufficient precision to be
	meaningful will be retained in the returned value.
	</p>
	<p>
	For an offscreen (pbuffer or pixmap) surface, or a surface
	whose pixel dot pitch or aspect ratio are unknown, querying
	<code class="constant">EGL_HORIZONTAL_RESOLUTION</code>,
	<code class="constant">EGL_PIXEL_ASPECT_RATIO</code>, or
	<code class="constant">EGL_VERTICAL_RESOLUTION</code> will return the
	constant value <code class="constant">EGL_UNKNOWN</code> (-1).
	</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.
	<em class="parameter"><code>value</code></em> is not modified when
	<code class="constant">EGL_FALSE</code> is returned.
	</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 surface.
	</p>
	<p>
	<code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
	<em class="parameter"><code>attribute</code></em> is not a valid surface attribute.
	</p>
	</div>
	<div class="refsect1">
	<a id="seealso"></a>
	<h2>See Also</h2>
	<p>
	<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="eglSurfaceAttrib.html"><span class="citerefentry"><span class="refentrytitle">eglSurfaceAttrib</span></span></a>,
	<a class="citerefentry" href="eglSwapBuffers.html"><span class="citerefentry"><span class="refentrytitle">eglSwapBuffers</span></span></a>
	</p>
	</div>
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	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,
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