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<title>eglCreatePbufferSurface</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
</head>
<body>
<div class="refentry">
<a id="eglCreatePbufferSurface"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<h1>eglCreatePbufferSurface</h1>
<p>
create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> pixel buffer 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">eglCreatePbufferSurface</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>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>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">eglCreatePbufferSurface</code> creates an
off-screen pixel buffer surface and returns its handle. If
<code class="function">eglCreatePbufferSurface</code> fails to create
a pixel buffer 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_HEIGHT</code>
</span>
</dt>
<dd>
<p>
Specifies the required height of the pixel buffer
surface. The default value is
<code class="constant">0</code>.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">EGL_LARGEST_PBUFFER</code>
</span>
</dt>
<dd>
<p>
Requests the largest available pixel buffer surface
when the allocation would otherwise fail. 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. The default value is
<code class="constant">EGL_FALSE</code>.
</p>
</dd>
<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>
<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>
<dt>
<span class="term">
<code class="constant">EGL_WIDTH</code>
</span>
</dt>
<dd>
<p>
Specifies the required width of the pixel buffer
surface. The default value is
<code class="constant">0</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>
Attributes
<code class="constant">EGL_RENDERABLE_TYPE</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>
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>
</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_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_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
<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
<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
<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>
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"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
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in all copies or substantial portions of the Materials.
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