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<title>Buffers: Cogl Reference Manual</title>
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<div class="refentry">
<a name="cogl-Buffers"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-Buffers.top_of_page"></a>Buffers</span></h2>
<p>Buffers — Common buffer functions, including data upload APIs</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-Buffers.stability-level"></a><h2>Stability Level</h2>
<acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="cogl-Buffers.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-is-buffer" title="cogl_is_buffer ()">cogl_is_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">unsigned <span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-get-size" title="cogl_buffer_get_size ()">cogl_buffer_get_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-set-update-hint" title="cogl_buffer_set_update_hint ()">cogl_buffer_set_update_hint</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint"><span class="returnvalue">CoglBufferUpdateHint</span></a>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-get-update-hint" title="cogl_buffer_get_update_hint ()">cogl_buffer_get_update_hint</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-map" title="cogl_buffer_map ()">cogl_buffer_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-unmap" title="cogl_buffer_unmap ()">cogl_buffer_unmap</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-buffer-set-data" title="cogl_buffer_set_data ()">cogl_buffer_set_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglPixelBuffer</span> *
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-pixel-buffer-new" title="cogl_pixel_buffer_new ()">cogl_pixel_buffer_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">CoglBool</span>
</td>
<td class="function_name">
<a class="link" href="cogl-Buffers.html#cogl-is-pixel-buffer" title="cogl_is_pixel_buffer ()">cogl_is_pixel_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-Buffers.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint">CoglBufferUpdateHint</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cogl-Buffers.html#CoglBufferAccess" title="enum CoglBufferAccess">CoglBufferAccess</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-Buffers.description"></a><h2>Description</h2>
<p>The CoglBuffer API provides a common interface to manipulate
buffers that have been allocated either via <a class="link" href="cogl-Buffers.html#cogl-pixel-buffer-new" title="cogl_pixel_buffer_new ()"><code class="function">cogl_pixel_buffer_new()</code></a>
or <code class="function">cogl_attribute_buffer_new()</code>. The API allows you to upload data
to these buffers and define usage hints that help Cogl manage your
buffer optimally.</p>
<p>Data can either be uploaded by supplying a pointer and size so Cogl
can copy your data, or you can <code class="function">mmap()</code> a CoglBuffer and then you can
copy data to the buffer directly.</p>
<p>One of the most common uses for CoglBuffers is to upload texture
data asynchronously since the ability to mmap the buffers into
the CPU makes it possible for another thread to handle the IO
of loading an image file and unpacking it into the mapped buffer
without blocking other Cogl operations.</p>
</div>
<div class="refsect1">
<a name="cogl-Buffers.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-is-buffer"></a><h3>cogl_is_buffer ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_is_buffer (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>Checks whether <em class="parameter"><code>buffer</code></em>
is a buffer object.</p>
<div class="refsect3">
<a name="cogl-is-buffer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-is-buffer.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the handle is a CoglBuffer, and <code class="literal">FALSE</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-get-size"></a><h3>cogl_buffer_get_size ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">int</span>
cogl_buffer_get_size (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>);</pre>
<p>Retrieves the size of buffer</p>
<div class="refsect3">
<a name="cogl-buffer-get-size.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-buffer-get-size.returns"></a><h4>Returns</h4>
<p> the size of the buffer in bytes</p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-set-update-hint"></a><h3>cogl_buffer_set_update_hint ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_buffer_set_update_hint (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint"><span class="type">CoglBufferUpdateHint</span></a> hint</code></em>);</pre>
<p>Sets the update hint on a buffer. See <a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint"><span class="type">CoglBufferUpdateHint</span></a> for a description
of the available hints.</p>
<div class="refsect3">
<a name="cogl-buffer-set-update-hint.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>hint</p></td>
<td class="parameter_description"><p>the new hint</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-get-update-hint"></a><h3>cogl_buffer_get_update_hint ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint"><span class="returnvalue">CoglBufferUpdateHint</span></a>
cogl_buffer_get_update_hint (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>);</pre>
<p>Retrieves the update hints set using <a class="link" href="cogl-Buffers.html#cogl-buffer-set-update-hint" title="cogl_buffer_set_update_hint ()"><code class="function">cogl_buffer_set_update_hint()</code></a></p>
<div class="refsect3">
<a name="cogl-buffer-get-update-hint.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-buffer-get-update-hint.returns"></a><h4>Returns</h4>
<p> the <a class="link" href="cogl-Buffers.html#CoglBufferUpdateHint" title="enum CoglBufferUpdateHint"><span class="type">CoglBufferUpdateHint</span></a> currently used by the buffer</p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-map"></a><h3>cogl_buffer_map ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
cogl_buffer_map (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Buffers.html#CoglBufferAccess" title="enum CoglBufferAccess"><span class="type">CoglBufferAccess</span></a> access</code></em>,
<em class="parameter"><code><span class="type">CoglBufferMapHint</span> hints</code></em>);</pre>
<p>Maps the buffer into the application address space for direct
access. This is equivalent to calling <code class="function">cogl_buffer_map_range()</code> with
zero as the offset and the size of the entire buffer as the size.</p>
<p>It is strongly recommended that you pass
<code class="literal">COGL_BUFFER_MAP_HINT_DISCARD</code> as a hint if you are going to replace
all the buffer's data. This way if the buffer is currently being
used by the GPU then the driver won't have to stall the CPU and
wait for the hardware to finish because it can instead allocate a
new buffer to map.</p>
<p>The behaviour is undefined if you access the buffer in a way
conflicting with the <em class="parameter"><code>access</code></em>
mask you pass. It is also an error to
release your last reference while the buffer is mapped.</p>
<div class="refsect3">
<a name="cogl-buffer-map.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>access</p></td>
<td class="parameter_description"><p>how the mapped buffer will be used by the application</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>hints</p></td>
<td class="parameter_description"><p>A mask of <span class="type">CoglBufferMapHint</span>s that tell Cogl how
the data will be modified once mapped.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-buffer-map.returns"></a><h4>Returns</h4>
<p> A pointer to the mapped memory or
<code class="literal">NULL</code> is the call fails. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-unmap"></a><h3>cogl_buffer_unmap ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_buffer_unmap (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>);</pre>
<p>Unmaps a buffer previously mapped by <a class="link" href="cogl-Buffers.html#cogl-buffer-map" title="cogl_buffer_map ()"><code class="function">cogl_buffer_map()</code></a>.</p>
<div class="refsect3">
<a name="cogl-buffer-unmap.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-buffer-set-data"></a><h3>cogl_buffer_set_data ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_buffer_set_data (<em class="parameter"><code><span class="type">CoglBuffer</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">size_t</span> offset</code></em>,
<em class="parameter"><code>const <span class="type">void</span> *data</code></em>,
<em class="parameter"><code><span class="type">size_t</span> size</code></em>);</pre>
<p>Updates part of the buffer with new data from <em class="parameter"><code>data</code></em>
. Where to put this new
data is controlled by <em class="parameter"><code>offset</code></em>
and <em class="parameter"><code>offset</code></em>
+ <em class="parameter"><code>data</code></em>
should be less than the
buffer size.</p>
<div class="refsect3">
<a name="cogl-buffer-set-data.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>destination offset (in bytes) in the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>a pointer to the data to be copied into the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>number of bytes to copy</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-buffer-set-data.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> is the operation succeeded, <code class="literal">FALSE</code> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-pixel-buffer-new"></a><h3>cogl_pixel_buffer_new ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglPixelBuffer</span> *
cogl_pixel_buffer_new (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code><span class="type">size_t</span> size</code></em>,
<em class="parameter"><code>const <span class="type">void</span> *data</code></em>);</pre>
<p>Declares a new <span class="type">CoglPixelBuffer</span> of <em class="parameter"><code>size</code></em>
bytes to contain arrays of
pixels. Once declared, data can be set using <a class="link" href="cogl-Buffers.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-Buffers.html#cogl-buffer-map" title="cogl_buffer_map ()"><code class="function">cogl_buffer_map()</code></a>.</p>
<p>If <em class="parameter"><code>data</code></em>
isn't <code class="literal">NULL</code> then <em class="parameter"><code>size</code></em>
bytes will be read from <em class="parameter"><code>data</code></em>
and
immediately copied into the new buffer.</p>
<div class="refsect3">
<a name="cogl-pixel-buffer-new.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>context</p></td>
<td class="parameter_description"><p>A <span class="type">CoglContext</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>The number of bytes to allocate for the pixel data.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>An optional pointer to vertex data to upload immediately</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-pixel-buffer-new.returns"></a><h4>Returns</h4>
<p> a newly allocated <span class="type">CoglPixelBuffer</span>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.10</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-pixel-buffer"></a><h3>cogl_is_pixel_buffer ()</h3>
<pre class="programlisting"><span class="returnvalue">CoglBool</span>
cogl_is_pixel_buffer (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>Checks whether <em class="parameter"><code>object</code></em>
is a pixel buffer.</p>
<div class="refsect3">
<a name="cogl-is-pixel-buffer.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>a <a class="link" href="cogl-General-API.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cogl-is-pixel-buffer.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the <em class="parameter"><code>object</code></em>
is a pixel buffer, and <code class="literal">FALSE</code>
otherwise</p>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
</div>
<div class="refsect1">
<a name="cogl-Buffers.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglBufferUpdateHint"></a><h3>enum CoglBufferUpdateHint</h3>
<p>The update hint on a buffer allows the user to give some detail on how often
the buffer data is going to be updated.</p>
<div class="refsect3">
<a name="CoglBufferUpdateHint.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-UPDATE-HINT-STATIC:CAPS"></a>COGL_BUFFER_UPDATE_HINT_STATIC</p></td>
<td class="enum_member_description">
<p>the buffer will not change over time</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-UPDATE-HINT-DYNAMIC:CAPS"></a>COGL_BUFFER_UPDATE_HINT_DYNAMIC</p></td>
<td class="enum_member_description">
<p>the buffer will change from time to time</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-UPDATE-HINT-STREAM:CAPS"></a>COGL_BUFFER_UPDATE_HINT_STREAM</p></td>
<td class="enum_member_description">
<p>the buffer will be used once or a couple of
times</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="CoglBufferAccess"></a><h3>enum CoglBufferAccess</h3>
<p>The access hints for <a class="link" href="cogl-Buffers.html#cogl-buffer-set-update-hint" title="cogl_buffer_set_update_hint ()"><code class="function">cogl_buffer_set_update_hint()</code></a></p>
<div class="refsect3">
<a name="CoglBufferAccess.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-ACCESS-READ:CAPS"></a>COGL_BUFFER_ACCESS_READ</p></td>
<td class="enum_member_description">
<p>the buffer will be read</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-ACCESS-WRITE:CAPS"></a>COGL_BUFFER_ACCESS_WRITE</p></td>
<td class="enum_member_description">
<p>the buffer will written to</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-BUFFER-ACCESS-READ-WRITE:CAPS"></a>COGL_BUFFER_ACCESS_READ_WRITE</p></td>
<td class="enum_member_description">
<p>the buffer will be used for both reading and
writing</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix05.html#api-index-1.2">1.2</a></p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
</div>
</div>
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