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<a href="#cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.description" class="shortcut">Description</a>
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<a name="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.top_of_page"></a>CoglAttributeBuffer: Buffers of vertex attributes</span></h2>
<p>CoglAttributeBuffer: Buffers of vertex attributes — Functions for creating and manipulating attribute
buffers</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer">CoglAttributeBuffer</a>;
<a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="returnvalue">CoglAttributeBuffer</span></a> * <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#cogl-attribute-buffer-new-with-size" title="cogl_attribute_buffer_new_with_size ()">cogl_attribute_buffer_new_with_size</a>
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *context</code></em>,
<em class="parameter"><code><span class="type">size_t</span> bytes</code></em>);
<a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="returnvalue">CoglAttributeBuffer</span></a> * <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#cogl-attribute-buffer-new" title="cogl_attribute_buffer_new ()">cogl_attribute_buffer_new</a> (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *context</code></em>,
<em class="parameter"><code><span class="type">size_t</span> bytes</code></em>,
<em class="parameter"><code>const <span class="type">void</span> *data</code></em>);
<a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a> <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#cogl-is-attribute-buffer" title="cogl_is_attribute_buffer ()">cogl_is_attribute_buffer</a> (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.description"></a><h2>Description</h2>
<p>
FIXME
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglAttributeBuffer"></a><h3>CoglAttributeBuffer</h3>
<pre class="programlisting">typedef struct _CoglAttributeBuffer CoglAttributeBuffer;</pre>
</div>
<hr>
<div class="refsect2">
<a name="cogl-attribute-buffer-new-with-size"></a><h3>cogl_attribute_buffer_new_with_size ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="returnvalue">CoglAttributeBuffer</span></a> * cogl_attribute_buffer_new_with_size
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *context</code></em>,
<em class="parameter"><code><span class="type">size_t</span> bytes</code></em>);</pre>
<p>
Describes a new <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a> of <em class="parameter"><code>size</code></em> bytes to contain
arrays of vertex attribute data. Afterwards data can be set using
<a class="link" href="cogl-2.0-experimental-CoglBuffer---The-Buffer-Interface.html#cogl-buffer-set-data" title="cogl_buffer_set_data ()"><code class="function">cogl_buffer_set_data()</code></a> or by mapping it into the application's
address space using <a class="link" href="cogl-2.0-experimental-CoglBuffer---The-Buffer-Interface.html#cogl-buffer-map" title="cogl_buffer_map ()"><code class="function">cogl_buffer_map()</code></a>.
</p>
<p>
The underlying storage of this buffer isn't allocated by this
function so that you have an opportunity to use the
<a class="link" href="cogl-2.0-experimental-CoglBuffer---The-Buffer-Interface.html#cogl-buffer-set-update-hint" title="cogl_buffer_set_update_hint ()"><code class="function">cogl_buffer_set_update_hint()</code></a> and <code class="function">cogl_buffer_set_usage_hint()</code>
functions which may influence how the storage is allocated. The
storage will be allocated once you upload data to the buffer.
</p>
<p>
Note: You can assume this function always succeeds and won't return
<code class="literal">NULL</code>
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bytes</code></em> :</span></p></td>
<td>The number of bytes to allocate for vertex attribute data.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a>. Never <code class="literal">NULL</code>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
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</tbody>
</table></div>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-attribute-buffer-new"></a><h3>cogl_attribute_buffer_new ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="returnvalue">CoglAttributeBuffer</span></a> * cogl_attribute_buffer_new (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *context</code></em>,
<em class="parameter"><code><span class="type">size_t</span> bytes</code></em>,
<em class="parameter"><code>const <span class="type">void</span> *data</code></em>);</pre>
<p>
Describes a new <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a> of <em class="parameter"><code>size</code></em> bytes to contain
arrays of vertex attribute data and also uploads <em class="parameter"><code>size</code></em> bytes read
from <em class="parameter"><code>data</code></em> to the new buffer.
</p>
<p>
You should never pass a <code class="literal">NULL</code> data pointer.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>This function does not report out-of-memory errors back to
the caller by returning <code class="literal">NULL</code> and so you can assume this function
always succeeds.</div>
<p>
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>In the unlikely case that there is an out of memory problem
then Cogl will abort the application with a message. If your
application needs to gracefully handle out-of-memory errors then
you can use <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#cogl-attribute-buffer-new-with-size" title="cogl_attribute_buffer_new_with_size ()"><code class="function">cogl_attribute_buffer_new_with_size()</code></a> and then
explicitly catch errors with <a class="link" href="cogl-2.0-experimental-CoglBuffer---The-Buffer-Interface.html#cogl-buffer-set-data" title="cogl_buffer_set_data ()"><code class="function">cogl_buffer_set_data()</code></a> or
<a class="link" href="cogl-2.0-experimental-CoglBuffer---The-Buffer-Interface.html#cogl-buffer-map" title="cogl_buffer_map ()"><code class="function">cogl_buffer_map()</code></a>.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bytes</code></em> :</span></p></td>
<td>The number of bytes to allocate for vertex attribute data.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>An optional pointer to vertex data to
upload immediately. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=bytes]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a> (never <code class="literal">NULL</code>). <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-attribute-buffer"></a><h3>cogl_is_attribute_buffer ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a> cogl_is_attribute_buffer (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Gets whether the given object references a <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
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<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>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> references a <a class="link" href="cogl-2.0-experimental-CoglAttributeBuffer---Buffers-of-vertex-attributes.html#CoglAttributeBuffer" title="CoglAttributeBuffer"><span class="type">CoglAttributeBuffer</span></a>,
<code class="literal">FALSE</code> otherwise</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
<p class="stability">Stability Level: Unstable</p>
</div>
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