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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Main loop integration</title>
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                  <a href="#cogl-2.0-experimental-Main-loop-integration.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="cogl-2.0-experimental-Main-loop-integration"></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-integration.top_of_page"></a>Main loop integration</span></h2>
<p>Main loop integration — 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-integration.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">enum                <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#CoglPollFDEvent" title="enum CoglPollFDEvent">CoglPollFDEvent</a>;
                    <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#CoglPollFD" title="CoglPollFD">CoglPollFD</a>;
<span class="returnvalue">int</span>                 <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-get-info" title="cogl_poll_renderer_get_info ()">cogl_poll_renderer_get_info</a>         (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</code></em>,
                                                         <em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Main-loop-integration.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">int64_t</span> *timeout</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-dispatch" title="cogl_poll_renderer_dispatch ()">cogl_poll_renderer_dispatch</a>         (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="cogl-2.0-experimental-Main-loop-integration.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-integration.html#cogl-glib-source-new" title="cogl_glib_source_new ()">cogl_glib_source_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">int</span> priority</code></em>);
<span class="returnvalue">GSource</span> *           <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-glib-renderer-source-new" title="cogl_glib_renderer_source_new ()">cogl_glib_renderer_source_new</a>       (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</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-integration.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-integration.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-integration.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>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-IN:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_IN</code></span></p></td>
<td>there is data to read
</td>
</tr>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-PRI:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_PRI</code></span></p></td>
<td>data can be written (without blocking)
</td>
</tr>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-OUT:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_OUT</code></span></p></td>
<td>there is urgent data to read.
</td>
</tr>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-ERR:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_ERR</code></span></p></td>
<td>error condition
</td>
</tr>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-HUP:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_HUP</code></span></p></td>
<td>hung up (the connection has been broken, usually
                         for pipes and sockets).
</td>
</tr>
<tr>
<td><p><a name="COGL-POLL-FD-EVENT-NVAL:CAPS"></a><span class="term"><code class="literal">COGL_POLL_FD_EVENT_NVAL</code></span></p></td>
<td>invalid request. The file descriptor is not open.
</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="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-integration.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-integration.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" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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-renderer-get-info"></a><h3>cogl_poll_renderer_get_info ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 cogl_poll_renderer_get_info         (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</code></em>,
                                                         <em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Main-loop-integration.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">int64_t</span> *timeout</code></em>);</pre>
<p>
Is used to integrate Cogl with an application mainloop that is based
on the unix poll(2) api (or <code class="function">select()</code> or something equivalent). This
api should be called whenever an application is about to go idle so
that Cogl has a chance to describe what file descriptor events it
needs to be woken up for.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>If your application is using the Glib mainloop then you
should jump to the <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-glib-source-new" title="cogl_glib_source_new ()"><code class="function">cogl_glib_source_new()</code></a> api as a more convenient
way of integrating Cogl with the mainloop.</div>
<p>
</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-integration.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.
</p>
<p>
When the application mainloop returns from calling poll(2) (or its
equivalent) then it should call <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-dispatch" title="cogl_poll_renderer_dispatch ()"><code class="function">cogl_poll_renderer_dispatch()</code></a>
passing a pointer the array of CoglPollFDs with updated
revent values.
</p>
<p>
When using the <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#COGL-WINSYS-ID-WGL:CAPS"><code class="literal">COGL_WINSYS_ID_WGL</code></a> winsys (where file descriptors
don't make any sense) or <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#COGL-WINSYS-ID-SDL:CAPS"><code class="literal">COGL_WINSYS_ID_SDL</code></a> (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 if
Cogl needs to be woken up immediately.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>renderer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a>
</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-integration.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>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A "poll fd state age" that changes whenever the set
of poll_fds has changed. If this API is being used to
integrate with another system mainloop api then
knowing if the set of file descriptors and events has
really changed can help avoid redundant work
depending the api. The age isn't guaranteed to change
when the timeout changes.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.16</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-poll-renderer-dispatch"></a><h3>cogl_poll_renderer_dispatch ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                cogl_poll_renderer_dispatch         (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</code></em>,
                                                         <em class="parameter"><code>const <a class="link" href="cogl-2.0-experimental-Main-loop-integration.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 when calling
<a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-get-info" title="cogl_poll_renderer_get_info ()"><code class="function">cogl_poll_renderer_get_info()</code></a> or a shorter array missing some file
descriptors that Cogl requested.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>If your application didn't originally create a <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a>
manually then you can easily get a <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> pointer by calling
<code class="function">cogl_get_renderer()</code>.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>renderer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a>
</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-integration.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 1.16</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><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">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-integration.html#cogl-poll-renderer-get-info" title="cogl_poll_renderer_get_info ()"><code class="function">cogl_poll_renderer_get_info()</code></a> and <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-dispatch" title="cogl_poll_renderer_dispatch ()"><code class="function">cogl_poll_renderer_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>
<p>
Applications that manually connect to a <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> before they
create a <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> should instead use
<a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-glib-renderer-source-new" title="cogl_glib_renderer_source_new ()"><code class="function">cogl_glib_renderer_source_new()</code></a> so that events may be dispatched
before a context has been created. In that case you don't need to
use this api in addition later, it is simply enough to use
<a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-glib-renderer-source-new" title="cogl_glib_renderer_source_new ()"><code class="function">cogl_glib_renderer_source_new()</code></a> instead.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>This api is actually just a thin convenience wrapper around
<a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-glib-renderer-source-new" title="cogl_glib_renderer_source_new ()"><code class="function">cogl_glib_renderer_source_new()</code></a>
</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<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>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>
<hr>
<div class="refsect2">
<a name="cogl-glib-renderer-source-new"></a><h3>cogl_glib_renderer_source_new ()</h3>
<pre class="programlisting"><span class="returnvalue">GSource</span> *           cogl_glib_renderer_source_new       (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> *renderer</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-integration.html#cogl-poll-renderer-get-info" title="cogl_poll_renderer_get_info ()"><code class="function">cogl_poll_renderer_get_info()</code></a> and <a class="link" href="cogl-2.0-experimental-Main-loop-integration.html#cogl-poll-renderer-dispatch" title="cogl_poll_renderer_dispatch ()"><code class="function">cogl_poll_renderer_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" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>renderer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a>
</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 1.16</p>
<p class="stability">Stability Level: Unstable</p>
</div>
</div>
</div>
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