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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#cogl-2.0-experimental-Offscreen-Framebuffers.description" class="shortcut">Description</a>
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<a name="cogl-2.0-experimental-Offscreen-Framebuffers"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-Offscreen-Framebuffers.top_of_page"></a>Offscreen Framebuffers</span></h2>
<p>Offscreen Framebuffers — Fuctions for creating and manipulating offscreen
                    framebuffers.</p>
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<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-Offscreen-Framebuffers.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><span class="returnvalue">CoglOffscreen</span> *     <a class="link" href="cogl-2.0-experimental-Offscreen-Framebuffers.html#cogl-offscreen-new-to-texture" title="cogl_offscreen_new_to_texture ()">cogl_offscreen_new_to_texture</a>       (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a> *texture</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="cogl-2.0-experimental-Offscreen-Framebuffers.html#cogl-is-offscreen" title="cogl_is_offscreen ()">cogl_is_offscreen</a>                   (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Offscreen-Framebuffers.description"></a><h2>Description</h2>
<p>
Cogl allows creating and operating on offscreen framebuffers.
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Offscreen-Framebuffers.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="cogl-offscreen-new-to-texture"></a><h3>cogl_offscreen_new_to_texture ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglOffscreen</span> *     cogl_offscreen_new_to_texture       (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a> *texture</code></em>);</pre>
<p>
This creates an offscreen buffer object using the given <em class="parameter"><code>texture</code></em> as the
primary color buffer. It doesn't just initialize the contents of the
offscreen buffer with the <em class="parameter"><code>texture</code></em>; they are tightly bound so that
drawing to the offscreen buffer effectivly updates the contents of the
given texture. You don't need to destroy the offscreen buffer before
you can use the <em class="parameter"><code>texture</code></em> again.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>This only works with low-level <a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a> types such as
<a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>, <a class="link" href="cogl-2.0-experimental-3D-textures.html#CoglTexture3D" title="CoglTexture3D"><span class="type">CoglTexture3D</span></a> and <a class="link" href="cogl-2.0-experimental-Rectangle-textures-(non-normalized-coordinates).html#CoglTextureRectangle" title="CoglTextureRectangle"><span class="type">CoglTextureRectangle</span></a>, and not
with meta-texture types such as <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>.</div>
<p>
</p>
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<td><p><span class="term"><em class="parameter"><code>texture</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Texture-Interface.html#CoglTexture" title="CoglTexture"><span class="type">CoglTexture</span></a> pointer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly instantiated <span class="type">CoglOffscreen</span>
framebuffer or <code class="literal">NULL</code> if it wasn't possible to create the
buffer. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
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<hr>
<div class="refsect2">
<a name="cogl-is-offscreen"></a><h3>cogl_is_offscreen ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            cogl_is_offscreen                   (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Determines whether the given <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> references an offscreen
framebuffer object.
</p>
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>A pointer to a <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if <em class="parameter"><code>object</code></em> is a <span class="type">CoglOffscreen</span> framebuffer,
<code class="literal">FALSE</code> otherwise</td>
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