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    <div class="refentry">
      <a id="eglCreatePbufferFromClientBuffer"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <h1>eglCreatePbufferFromClientBuffer</h1>
        <p>
            create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> pixel buffer surface
            bound to an OpenVG image
        </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">eglCreatePbufferFromClientBuffer</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>EGLenum  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buftype</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>EGLClientBuffer  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buffer</var>, </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>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>buftype</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the type of client API buffer to be bound.
                    Must be <code class="constant">EGL_OPENVG_IMAGE</code>,
                    corresponding to an OpenVG <span class="type">VGImage</span>
                    buffer.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>buffer</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the OpenVG <span class="type">VGImage</span> handle of
                    the buffer to be bound.
                </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>attrib_list</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies pixel buffer 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">eglCreatePbufferFromClientBuffer</code> creates an
            off-screen pixel buffer surface and returns its handle. If
            <code class="function">eglCreatePbufferFromClientBuffer</code> fails to create
            a pixel buffer surface, <code class="constant">EGL_NO_SURFACE</code>
            is returned.
        </p>
        <p>
            The new pixel buffer surface is similar to a pixel buffer
            created with
            <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>,
            but storage for the color buffer is provided by a client API
            buffer. Other buffer required by
            <em class="parameter"><code>config</code></em>, such as depth, stencil, and
            alpha mask, are allocated by EGL.
        </p>
        <p>
            <em class="parameter"><code>buftype</code></em> must be
            <code class="constant">EGL_OPENVG_IMAGE</code>, corresponding to an
            OpenVG <span class="type">VGImage</span> buffer.
            <em class="parameter"><code>buffer</code></em> must be a valid
            <span class="type">VGImage</span> handle in the current OpenVG context,
            cast into the type <span class="type">EGLClientBuffer</span>.
        </p>
        <p>
            The height, width,, OpenVG alpha format, and OpenVG
            colorspace (surface attributes
            <code class="constant">EGL_HEIGHT</code>,
            <code class="constant">EGL_WIDTH</code>,
            <code class="constant">EGL_VG_ALPHA_FORMAT</code>, and
            <code class="constant">EGL_VG_COLORSPACE</code>, respectively) of the
            resulting surface are determined by the size and format of
            <em class="parameter"><code>buffer</code></em>.
        </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_MIPMAP_TEXTURE</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies whether storage for mipmaps should be
                    allocated. Space for mipmaps will be set aside if
                    the attribute value is <code class="constant">EGL_TRUE</code>
                    and <code class="constant">EGL_TEXTURE_FORMAT</code> is not
                    <code class="constant">EGL_NO_TEXTURE</code>. The default
                    value is <code class="constant">EGL_FALSE</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">EGL_TEXTURE_FORMAT</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the format of the texture that will be
                    created when a pbuffer is bound to a texture map.
                    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>. The default
                    value is <code class="constant">EGL_NO_TEXTURE</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="constant">EGL_TEXTURE_TARGET</code>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the target for the texture that will be
                    created when the pbuffer is created with a texture
                    format of <code class="constant">EGL_TEXTURE_RGB</code> or
                    <code class="constant">EGL_TEXTURE_RGBA</code>. Possible
                    values are <code class="constant">EGL_NO_TEXTURE</code>, or
                    <code class="constant">EGL_TEXTURE_2D</code>. The default
                    value is <code class="constant">EGL_NO_TEXTURE</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 dimensions of the allocated pixel buffer
            surface or 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>
            <code class="function">eglCreatePbufferFromClientBuffer</code> is
            supported only if the EGL version is 1.2 or greater, and if
            the EGL implementation supports the OpenVG client API.
        </p>
        <p>
            Currently
            <code class="function">eglCreatePbufferFromClientBuffer</code> only
            supports binding OpenVG <span class="type">VGImage</span> buffers to
            pixel buffers. While other client API resources could be
            supported in the future, mechanisms such as OpenGL ES
            framebuffer objects, and the family of EGL and client API
            extensions for defining and using <span class="type">EGLImageKHR</span>
            images, are a more flexible and general framework to satisfy
            most of the same needs.
        </p>
        <p>
            If the value of <em class="parameter"><code>config</code></em> attribute
            <code class="constant">EGL_TEXTURE_FORMAT</code> is not
            <code class="constant">EGL_NO_TEXTURE</code>, then the pbuffer width
            and height specify the size of the level zero texture image
        </p>
        <p>
            If <code class="constant">EGL_LARGEST_PBUFFER</code> is specified and
            if the pbuffer will be used as a texture (i.e. the value of
            <code class="constant">EGL_TEXTURE_TARGET</code> is
            <code class="constant">EGL_TEXTURE_2D</code>, and the value of
            <code class="constant">EGL_TEXTURE FORMAT</code> is
            <code class="constant">EGL_TEXTURE_RGB</code> or
            <code class="constant">EGL_TEXTURE_RGBA</code>), then the aspect
            ratio will be preserved and the new width and height will be
            valid sizes for the texture target (e.g. if the underlying
            OpenGL ES implementation does not support non-power-of-two
            textures, both the width and height will be a power of 2).
        </p>
        <p>
            The contents of the depth and stencil buffers may not be
            preserved when rendering a texture to the pbuffer and
            switching which image of the texture is rendered to (e.g.,
            switching from rendering one mipmap level to rendering
            another).
        </p>
        <p>
            Binding client API buffers to EGL pbuffers create the
            possibility of race conditions, and of buffers being deleted
            through one API while still in use in another API. To avoid
            these problems, a number of constraints apply to bound
            client API buffers:
            </p>
        <div class="orderedlist">
          <ol class="orderedlist" type="1">
            <li class="listitem">
              <p>
                    Bound buffers may be used exclusively by either EGL,
                    or the client API that originally created them. For
                    example, if a <span class="type">VGImage</span> is bound to a
                    pbuffer, and that pbuffer is bound to any client API
                    rendering context, then the <span class="type">VGImage</span> may
                    not be used as the explicit source or destination of
                    any OpenVG operation. Errors resulting from such use
                    are described in client API specifications.
                    Similarly, while a <span class="type">VGImage</span> is in use by
                    OpenVG, the pbuffer it is bound to may not be made
                    current to any client API context using
                    <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>.
                </p>
            </li>
            <li class="listitem">
              <p>
                    Binding a buffer creates an additional reference to
                    it, and implementations must respect outstanding
                    references when destroying objects. For example, if
                    a <span class="type">VGImage</span> is bound to a pbuffer,
                    destroying the image with
                    <code class="function">vgDestroyImage</code> will not free
                    the underlying buffer, because it is still in use by
                    EGL. However, following
                    <code class="function">vgDestroyImage</code> the buffer may
                    only be referred to via the EGL pbuffer handle,
                    since the OpenVG handle to that buffer no longer
                    exists. Similarly, destroying the pbuffer with
                    <code class="function">eglDestroySurface</code> will not free
                    the underlying buffer, because it is still in use by
                    OpenVG . However, following
                    <code class="function">eglDestroySurface</code> the buffer
                    may only be referred to via the OpenVG
                    <span class="type">VGImage</span> handle, since the EGL pbuffer
                    handle no longer exists.
                </p>
            </li>
          </ol>
        </div>
        <p>
        </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_PARAMETER</code> is generated if
            <em class="parameter"><code>buftype</code></em> is not
            <code class="constant">EGL_OPENVG_IMAGE</code>, or if
            <em class="parameter"><code>buffer</code></em> is not a valid handle to a
            <span class="type">VGImage</span> object in the currently bound OpenVG
            context.
        </p>
        <p>
            <code class="constant">EGL_BAD_ACCESS</code> is generated if there is
            no current OpenVG context, or if
            <em class="parameter"><code>buffer</code></em> is already bound to another
            pixel buffer or in use by OpenVG as discussed in the Notes
            section above.
        </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_ATTRIBUTE</code> is generated if
            <em class="parameter"><code>attrib_list</code></em> contains an invalid pixel
            buffer attribute or if an attribute value is not recognized
            or out of range.
        </p>
        <p>
            <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
            <em class="parameter"><code>attrib_list</code></em> contains any of the
            attributes <code class="constant">EGL_MIPMAP_TEXTURE</code>,
            <code class="constant">EGL_TEXTURE_FORMAT</code>, or
            <code class="constant">EGL_TEXTURE_TARGET</code>, and
            <em class="parameter"><code>config</code></em> does not support OpenGL ES
            rendering (e.g. the EGL version is 1.2 or later, and the
            <code class="constant">EGL_RENDERABLE_TYPE</code> attribute of
            <em class="parameter"><code>config</code></em> does not include at least one
            of <code class="constant">EGL_OPENGL_ES_BIT</code> or
            <code class="constant">EGL_OPENGL_ES2_BIT</code>).
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if
            <em class="parameter"><code>config</code></em> does not support rendering to pixel buffers
            (the <code class="constant">EGL_SURFACE_TYPE</code> attribute does not contain
            <code class="constant">EGL_PBUFFER_BIT</code>).
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if the
            buffers contained in <em class="parameter"><code>buffer</code></em> do not
            match the bit depths for those buffers specified by
            <em class="parameter"><code>config</code></em>.
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if the
            <code class="constant">EGL_TEXTURE_FORMAT</code> attribute is not
            <code class="constant">EGL_NO_TEXTURE</code>, and
            <code class="constant">EGL_WIDTH</code> and/or
            <code class="constant">EGL_HEIGHT</code> specify an invalid size
            (e.g., the texture size is not a power of 2, and the
            underlying OpenGL ES implementation does not support
            non-power-of-two textures).
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if
            the <code class="constant">EGL_TEXTURE_FORMAT</code> attribute is
            <code class="constant">EGL_NO_TEXTURE</code>, and
            <code class="constant">EGL_TEXTURE_TARGET</code> is something other
            than <code class="constant">EGL_NO_TEXTURE</code>; or,
            <code class="constant">EGL_TEXTURE_FORMAT</code> is something other
            than <code class="constant">EGL_NO_TEXTURE</code>, and
            <code class="constant">EGL_TEXTURE_TARGET</code> is
            <code class="constant">EGL_NO_TEXTURE</code>.
        </p>
        <p>
            <code class="constant">EGL_BAD_MATCH</code> is generated if the
            implementation has additional constraints on which types of
            client API buffers may be bound to pixel buffer surfaces.
            For example, it is possible that the OpenVG implementation
            might not support a <span class="type">VGImage</span> being bound to a
            pixel buffer which will be used as a mipmapped OpenGL ES
            texture (e.g. whose <code class="constant">EGL_MIPMAP_TEXTURE</code>
            attribute is <code class="constant">TRUE</code>). Any such
            constraints should be documented by the implementation
            release notes.
        </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="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</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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