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<a href="#cogl-2.0-experimental-Main-loop-integeration.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="cogl-2.0-experimental-Main-loop-integeration"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-Main-loop-integeration.top_of_page"></a>Main loop integeration</span></h2>
<p>Main loop integeration — Functions for integrating Cogl with an
application's main loop</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-Main-loop-integeration.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">enum <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFDEvent" title="enum CoglPollFDEvent">CoglPollFDEvent</a>;
<a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD">CoglPollFD</a>;
<span class="returnvalue">void</span> <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-poll-get-info" title="cogl_poll_get_info ()">cogl_poll_get_info</a> (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a> **poll_fds</code></em>,
<em class="parameter"><code><span class="type">int</span> *n_poll_fds</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *timeout</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-poll-dispatch" title="cogl_poll_dispatch ()">cogl_poll_dispatch</a> (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a> *poll_fds</code></em>,
<em class="parameter"><code><span class="type">int</span> n_poll_fds</code></em>);
<span class="returnvalue">GSource</span> * <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-glib-source-new" title="cogl_glib_source_new ()">cogl_glib_source_new</a> (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code><span class="type">int</span> priority</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Main-loop-integeration.description"></a><h2>Description</h2>
<p>
Cogl needs to integrate with the application's main loop so that it
can internally handle some events from the driver. All Cogl
applications must use these functions. They provide enough
information to describe the state that Cogl will need to wake up
on. An application using the GLib main loop can instead use
<a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-glib-source-new" title="cogl_glib_source_new ()"><code class="function">cogl_glib_source_new()</code></a> which provides a <span class="type">GSource</span> ready to be added
to the main loop.
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Main-loop-integeration.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglPollFDEvent"></a><h3>enum CoglPollFDEvent</h3>
<pre class="programlisting">typedef enum {
COGL_POLL_FD_EVENT_IN = COGL_SYSDEF_POLLIN,
COGL_POLL_FD_EVENT_PRI = COGL_SYSDEF_POLLPRI,
COGL_POLL_FD_EVENT_OUT = COGL_SYSDEF_POLLOUT,
COGL_POLL_FD_EVENT_ERR = COGL_SYSDEF_POLLERR,
COGL_POLL_FD_EVENT_HUP = COGL_SYSDEF_POLLHUP,
COGL_POLL_FD_EVENT_NVAL = COGL_SYSDEF_POLLNVAL
} CoglPollFDEvent;
</pre>
<p>
A bitmask of events that Cogl may need to wake on for a file
descriptor. Note that these all have the same values as the
corresponding defines for the poll function call on Unix so they
may be directly passed to poll.
</p>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglPollFD"></a><h3>CoglPollFD</h3>
<pre class="programlisting">typedef struct {
int fd;
short int events;
short int revents;
} CoglPollFD;
</pre>
<p>
A struct for describing the state of a file descriptor that Cogl
needs to block on. The <em class="parameter"><code>events</code></em> field contains a bitmask of
<a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFDEvent" title="enum CoglPollFDEvent"><span class="type">CoglPollFDEvent</span></a>s that should cause the application to wake
up. After the application is woken up from idle it should pass back
an array of <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a>s to Cogl and update the <em class="parameter"><code>revents</code></em>
mask to the actual events that occurred on the file descriptor.
</p>
<p>
Note that CoglPollFD is deliberately exactly the same as struct
pollfd on Unix so that it can simply be cast when calling poll.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="CoglPollFD.fd"></a>fd</code></em>;</span></p></td>
<td>The file descriptor to block on</td>
</tr>
<tr>
<td><p><span class="term">short <span class="type">int</span> <em class="structfield"><code><a name="CoglPollFD.events"></a>events</code></em>;</span></p></td>
<td>A bitmask of events to block on</td>
</tr>
<tr>
<td><p><span class="term">short <span class="type">int</span> <em class="structfield"><code><a name="CoglPollFD.revents"></a>revents</code></em>;</span></p></td>
<td>A bitmask of returned events</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-poll-get-info"></a><h3>cogl_poll_get_info ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_poll_get_info (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a> **poll_fds</code></em>,
<em class="parameter"><code><span class="type">int</span> *n_poll_fds</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *timeout</code></em>);</pre>
<p>
This should be called whenever an application is about to go idle
so that Cogl has a chance to describe what state it needs to be
woken up on. The assumption is that the application is using a main
loop with something like the poll function call on Unix or the GLib
main loop.
</p>
<p>
After the function is called *<em class="parameter"><code>poll_fds</code></em> will contain a pointer to
an array of <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a> structs describing the file descriptors
that Cogl expects. The fd and events members will be updated
accordingly. After the application has completed its idle it is
expected to either update the revents members directly in this
array or to create a copy of the array and update them
there. Either way it should pass a pointer to either array back to
Cogl when calling <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-poll-dispatch" title="cogl_poll_dispatch ()"><code class="function">cogl_poll_dispatch()</code></a>.
</p>
<p>
When using the <code class="literal">COGL_WINSYS_ID_WGL</code> winsys (where file descriptors
don't make any sense) or <code class="literal">COGL_WINSYS_ID_SDL</code> (where the event
handling functions of SDL don't allow blocking on a file
descriptor) *n_poll_fds is guaranteed to be zero.
</p>
<p>
<em class="parameter"><code>timeout</code></em> will contain a maximum amount of time to wait in
microseconds before the application should wake up or -1 if the
application should wait indefinitely. This can also be 0 zero if
Cogl needs to be woken up immediately.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>poll_fds</code></em> :</span></p></td>
<td>A return location for a pointer to an array
of <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a>s</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_poll_fds</code></em> :</span></p></td>
<td>A return location for the number of entries in *<em class="parameter"><code>poll_fds</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timeout</code></em> :</span></p></td>
<td>A return location for the maximum length of time to wait
in microseconds, or -1 to wait indefinitely.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-poll-dispatch"></a><h3>cogl_poll_dispatch ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_poll_dispatch (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a> *poll_fds</code></em>,
<em class="parameter"><code><span class="type">int</span> n_poll_fds</code></em>);</pre>
<p>
This should be called whenever an application is woken up from
going idle in its main loop. The <em class="parameter"><code>poll_fds</code></em> array should contain a
list of file descriptors matched with the events that occurred in
revents. The events field is ignored. It is safe to pass in extra
file descriptors that Cogl didn't request from
<code class="function">cogl_context_begin_idle()</code> or a shorter array missing some file
descriptors that Cogl requested.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>poll_fds</code></em> :</span></p></td>
<td>An array of <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#CoglPollFD" title="CoglPollFD"><span class="type">CoglPollFD</span></a>s describing the events
that have occurred since the application went idle.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_poll_fds</code></em> :</span></p></td>
<td>The length of the <em class="parameter"><code>poll_fds</code></em> array.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-glib-source-new"></a><h3>cogl_glib_source_new ()</h3>
<pre class="programlisting"><span class="returnvalue">GSource</span> * cogl_glib_source_new (<em class="parameter"><code><span class="type">CoglContext</span> *context</code></em>,
<em class="parameter"><code><span class="type">int</span> priority</code></em>);</pre>
<p>
Creates a <span class="type">GSource</span> which handles Cogl's internal system event
processing. This can be used as a convenience instead of
<a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-poll-get-info" title="cogl_poll_get_info ()"><code class="function">cogl_poll_get_info()</code></a> and <a class="link" href="cogl-2.0-experimental-Main-loop-integeration.html#cogl-poll-dispatch" title="cogl_poll_dispatch ()"><code class="function">cogl_poll_dispatch()</code></a> in applications that
are already using the GLib main loop. After this is called the
<span class="type">GSource</span> should be attached to the main loop using
<code class="function">g_source_attach()</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>priority</code></em> :</span></p></td>
<td>The priority of the <span class="type">GSource</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <span class="type">GSource</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
</div>
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