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    <title>eglCreateWindowSurface</title>
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    <div class="refentry">
      <a id="eglCreateWindowSurface"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <h1>eglCreateWindowSurface</h1>
        <p>
            create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> window surface
        </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">EGLSurface <strong class="fsfunc">eglCreateWindowSurface</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>EGLConfig  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">config</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>NativeWindowType  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">native_window</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>EGLint const *  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attrib_list</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>config</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Specifies the EGL frame buffer configuration that defines the
                    frame buffer resource available to the surface.</p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>native_window</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>Specifies the native window.</p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>attrib_list</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies window surface attributes.
                    May be <code class="constant">NULL</code> or empty
                    (first attribute is <code class="constant">EGL_NONE</code>).
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
            <code class="function">eglCreateWindowSurface</code> creates an EGL
            window surface and returns its handle. If
            <code class="function">eglCreateWindowSurface</code> fails to create
            a window surface, <code class="constant">EGL_NO_SURFACE</code> is
            returned.
        </p>
        <p>
            Surface attributes are specified as a list of
            attribute-value pairs, terminated with
            <code class="constant">EGL_NONE</code>. Accepted attributes
            are:
        </p>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="constant">EGL_RENDER_BUFFER</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies which buffer should be used for client API
                    rendering to the window. If its value is
                    <code class="constant">EGL_SINGLE_BUFFER</code>, then client
                    APIs should render directly into the visible window.
                    If its value is
                    <code class="constant">EGL_BACK_BUFFER</code>, then client
                    APIs should render into the back buffer. The default
                    value of <code class="constant">EGL_RENDER_BUFFER</code> is
                    <code class="constant">EGL_BACK_BUFFER</code>.
                </p>
              <p>
                    Client APIs may not be able to respect the requested
                    rendering buffer. 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_VG_ALPHA_FORMAT</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies how alpha values are interpreted by OpenVG
                    when rendering to the surface. If its value is
                    <code class="constant">EGL_VG_ALPHA_FORMAT_NONPRE</code>,
                    then alpha values are not premultipled. If its value
                    is <code class="constant">EGL_VG_ALPHA_FORMAT_PRE</code>,
                    then alpha values are premultiplied. The default
                    value of <code class="constant">EGL_VG_ALPHA_FORMAT</code> is
                    <code class="constant">EGL_VG_ALPHA_FORMAT_NONPRE</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">EGL_VG_COLORSPACE</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the color space used by OpenVG when
                    rendering to the surface. If its value is
                    <code class="constant">EGL_VG_COLORSPACE_sRGB</code>, then a
                    non-linear, perceptually uniform color space is
                    assumed, with a corresponding
                    <span class="type">VGImageFormat</span> of form
                    <code class="constant">VG_s*</code>. If its value is
                    <code class="constant">EGL_VG_COLORSPACE_LINEAR</code>, then
                    a linear color space is assumed, with a
                    corresponding <span class="type">VGImageFormat</span> of form
                    <code class="constant">VG_l*</code>. The default value of
                    <code class="constant">EGL_VG_COLORSPACE</code> is
                    <code class="constant">EGL_VG_COLORSPACE_sRGB</code>.
                </p>
            </dd>
          </dl>
        </div>
        <p>
            Any EGL rendering context that was created with respect to
            <em class="parameter"><code>config</code></em> can be used to render into the
            surface. Use
            <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>
            to attach an EGL rendering context to the surface.
        </p>
        <p>
            Use
            <a class="citerefentry" href="eglQuerySurface.html"><span class="citerefentry"><span class="refentrytitle">eglQuerySurface</span></span></a>
            to retrieve the ID of <em class="parameter"><code>config</code></em>.
        </p>
        <p>
            Use
            <a class="citerefentry" href="eglDestroySurface.html"><span class="citerefentry"><span class="refentrytitle">eglDestroySurface</span></span></a>
            to destroy the surface.
        </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
            Attributes <code class="constant">EGL_RENDER_BUFFER</code>,
            <code class="constant">EGL_VG_ALPHA_FORMAT</code>, and
            <code class="constant">EGL_VG_COLORSPACE</code>, and the
            corresponding attribute values, are supported only if the
            EGL version is 1.2 or greater.
        </p>
        <p>
            The <code class="constant">EGL_VG_ALPHA_FORMAT</code> and
            <code class="constant">EGL_VG_COLORSPACE</code> attributes are used
            only by OpenVG. EGL itself, and other client APIs such as
            OpenGL and OpenGL ES , do not distinguish multiple
            colorspace models. Refer to section 11.2 of the OpenVG 1.0
            specification for more information. The native window
            system's use and interpretation of alpha values is outside
            the scope of EGL, although the preferred behavior is for the
            window system to ignore the value of
            <code class="constant">EGL_VG_ALPHA_FORMAT</code> when compositing
            window surfaces.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
            <code class="constant">EGL_NO_SURFACE</code> is returned if creation of
            the context fails.
        </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_CONFIG</code> is generated if
            <em class="parameter"><code>config</code></em> is not an EGL frame buffer configuration.
        </p>
        <p>
            <code class="constant">EGL_BAD_NATIVE_WINDOW</code> may be generated if
            <em class="parameter"><code>native_window</code></em> is not a valid native window.
        </p>
        <p>
            <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
            <em class="parameter"><code>attrib_list</code></em> contains an invalid window attribute
            or if an attribute value is not recognized or is out of range.
        </p>
        <p>
            <code class="constant">EGL_BAD_ALLOC</code> is generated if there are not
            enough resources to allocate the new surface.
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if the attributes of
            <em class="parameter"><code>native_window</code></em> do not correspond to
            <em class="parameter"><code>config</code></em> or if
            <em class="parameter"><code>config</code></em> does not support rendering to windows
            (the <code class="constant">EGL_SURFACE_TYPE</code> attribute does not contain
            <code class="constant">EGL_WINDOW_BIT</code>).
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if
            <em class="parameter"><code>config</code></em> does not support the specified
            OpenVG alpha format attribute (the value of
            <code class="constant">EGL_VG_ALPHA_FORMAT</code> is
            <code class="constant">EGL_VG_ALPHA_FORMAT_PRE</code> and the
            <code class="constant">EGL_VG_ALPHA_FORMAT_PRE_BIT</code> is not set
            in the <code class="constant">EGL_SURFACE_TYPE</code> attribute of
            <em class="parameter"><code>config</code></em>) or colorspace attribute (the
            value of <code class="constant">EGL_VG_COLORSPACE</code> is
            <code class="constant">EGL_VG_COLORSPACE_LINEAR</code> and the
            <code class="constant">EGL_VG_COLORSPACE_LINEAR_IT</code> is not set
            in the <code class="constant">EGL_SURFACE_TYPE</code> attribute of
            <em class="parameter"><code>config</code></em>).
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="eglDestroySurface.html"><span class="citerefentry"><span class="refentrytitle">eglDestroySurface</span></span></a>,
            <a class="citerefentry" href="eglChooseConfig.html"><span class="citerefentry"><span class="refentrytitle">eglChooseConfig</span></span></a>,
            <a class="citerefentry" href="eglGetConfigs.html"><span class="citerefentry"><span class="refentrytitle">eglGetConfigs</span></span></a>,
            <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>,
            <a class="citerefentry" href="eglQuerySurface.html"><span class="citerefentry"><span class="refentrytitle">eglQuerySurface</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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