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<title>SDL Integration: Cogl 2.0 Reference Manual</title>
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<a name="cogl-2.0-experimental-SDL-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-SDL-Integration.top_of_page"></a>SDL Integration</span></h2>
<p>SDL Integration — Integration api for the Simple DirectMedia
Layer library.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-2.0-experimental-SDL-Integration.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="returnvalue">CoglContext</span></a> *
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-context-new" title="cogl_sdl_context_new ()">cogl_sdl_context_new</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-2.0-experimental-SDL-Integration.html#cogl-sdl-renderer-set-event-type" title="cogl_sdl_renderer_set_event_type ()">cogl_sdl_renderer_set_event_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-renderer-get-event-type" title="cogl_sdl_renderer_get_event_type ()">cogl_sdl_renderer_get_event_type</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-2.0-experimental-SDL-Integration.html#cogl-sdl-handle-event" title="cogl_sdl_handle_event ()">cogl_sdl_handle_event</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-2.0-experimental-SDL-Integration.html#cogl-sdl-idle" title="cogl_sdl_idle ()">cogl_sdl_idle</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">SDL_Window</span> *
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-onscreen-get-window" title="cogl_sdl_onscreen_get_window ()">cogl_sdl_onscreen_get_window</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-SDL-Integration.description"></a><h2>Description</h2>
<p>Cogl is a portable graphics api that can either be used standalone
or alternatively integrated with certain existing frameworks. This
api enables Cogl to be used in conjunction with the Simple
DirectMedia Layer library.</p>
<p>Using this API a typical SDL application would look something like
this:</p>
<div class="informalexample"><pre class="programlisting">
MyAppData data;
CoglError *error = NULL;
data.ctx = cogl_sdl_context_new (SDL_USEREVENT, &error);
if (!data.ctx)
{
fprintf (stderr, "Failed to create context: %s\n",
error->message);
return 1;
}
my_application_setup (&data);
data.redraw_queued = TRUE;
while (!data.quit)
{
while (!data.quit)
{
if (!SDL_PollEvent (&event))
{
if (data.redraw_queued)
break;
cogl_sdl_idle (ctx);
if (!SDL_WaitEvent (&event))
{
fprintf (stderr, "Error waiting for SDL events");
return 1;
}
}
handle_event (&data, &event);
cogl_sdl_handle_event (ctx, &event);
}
data.redraw_queued = redraw (&data);
}
</pre></div>
<p></p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-SDL-Integration.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-sdl-context-new"></a><h3>cogl_sdl_context_new ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="returnvalue">CoglContext</span></a> *
cogl_sdl_context_new (<em class="parameter"><code><span class="type">int</span> type</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);</pre>
<p>This is a convenience function for creating a new <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> for
use with SDL and specifying what SDL user event type Cogl can use
as a way to interrupt <code class="function">SDL_WaitEvent()</code>.</p>
<p>This function is equivalent to the following code:</p>
<div class="informalexample"><pre class="programlisting">
CoglRenderer *renderer = cogl_renderer_new ();
CoglDisplay *display;
cogl_renderer_set_winsys_id (renderer, COGL_WINSYS_ID_SDL);
cogl_sdl_renderer_set_event_type (renderer, type);
if (!cogl_renderer_connect (renderer, error))
return NULL;
display = cogl_display_new (renderer, NULL);
if (!cogl_display_setup (display, error))
return NULL;
return cogl_context_new (display, error);
</pre></div>
<p></p>
<div class="note">SDL applications are required to either use this API or
to manually 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> and call
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-renderer-set-event-type" title="cogl_sdl_renderer_set_event_type ()"><code class="function">cogl_sdl_renderer_set_event_type()</code></a>.</div>
<div class="refsect3">
<a name="id-1.2.14.2.5.2.9"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>type</p></td>
<td class="parameter_description">
<p>An SDL user event type between <code class="constant">SDL_USEREVENT</code> and</p>
<code class="constant">SDL_NUMEVENTS</code> - 1</td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>A CoglError return location.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 2.0</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-sdl-renderer-set-event-type"></a><h3>cogl_sdl_renderer_set_event_type ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_sdl_renderer_set_event_type (<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> type</code></em>);</pre>
<p>Tells Cogl what SDL user event type it can use as a way to
interrupt <code class="function">SDL_WaitEvent()</code> to ensure that <a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-handle-event" title="cogl_sdl_handle_event ()"><code class="function">cogl_sdl_handle_event()</code></a>
will be called in a finite amount of time.</p>
<div class="note">This should only be called on an un-connected
<em class="parameter"><code>renderer</code></em>.</div>
<div class="note">For convenience most simple applications can use
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-context-new" title="cogl_sdl_context_new ()"><code class="function">cogl_sdl_context_new()</code></a> if they don't want to manually create
<a class="link" href="cogl-2.0-experimental-CoglRenderer---Connect-to-a-backend-renderer.html#CoglRenderer" title="CoglRenderer"><span class="type">CoglRenderer</span></a> and <a class="link" href="cogl-2.0-experimental-CoglDisplay---Setup-a-display-pipeline.html#CoglDisplay" title="CoglDisplay"><span class="type">CoglDisplay</span></a> objects during
initialization.</div>
<div class="refsect3">
<a name="id-1.2.14.2.5.3.7"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>renderer</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description">
<p>An SDL user event type between <code class="constant">SDL_USEREVENT</code> and</p>
<code class="constant">SDL_NUMEVENTS</code> - 1</td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 2.0</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-sdl-renderer-get-event-type"></a><h3>cogl_sdl_renderer_get_event_type ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
cogl_sdl_renderer_get_event_type (<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>);</pre>
<p>Queries what SDL user event type Cogl is using as a way to
interrupt <code class="function">SDL_WaitEvent()</code>. This is set either using
cogl_sdl_context_new or by using
<a class="link" href="cogl-2.0-experimental-SDL-Integration.html#cogl-sdl-renderer-set-event-type" title="cogl_sdl_renderer_set_event_type ()"><code class="function">cogl_sdl_renderer_set_event_type()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.14.2.5.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>renderer</p></td>
<td class="parameter_description"><p>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></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 2.0</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-sdl-handle-event"></a><h3>cogl_sdl_handle_event ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_sdl_handle_event (<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">SDL_Event</span> *event</code></em>);</pre>
<p>Passes control to Cogl so that it may dispatch any internal event
callbacks in response to the given SDL <em class="parameter"><code>event</code></em>
. This function must
be called for every SDL event.</p>
<div class="refsect3">
<a name="id-1.2.14.2.5.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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 <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>event</p></td>
<td class="parameter_description"><p>An SDL event</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 2.0</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-sdl-idle"></a><h3>cogl_sdl_idle ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_sdl_idle (<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>);</pre>
<p>Notifies Cogl that the application is idle and about to call
<code class="function">SDL_WaitEvent()</code>. Cogl may use this to run low priority book keeping
tasks.</p>
<div class="refsect3">
<a name="id-1.2.14.2.5.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table 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 <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 2.0</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-sdl-onscreen-get-window"></a><h3>cogl_sdl_onscreen_get_window ()</h3>
<pre class="programlisting"><span class="returnvalue">SDL_Window</span> *
cogl_sdl_onscreen_get_window (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-CoglOnscreen---The-Onscreen-Framebuffer-Interface.html#CoglOnscreen" title="CoglOnscreen"><span class="type">CoglOnscreen</span></a> *onscreen</code></em>);</pre>
<div class="refsect3">
<a name="id-1.2.14.2.5.7.4"></a><h4>Parameters</h4>
<div class="informaltable"><table 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>onscreen</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-CoglOnscreen---The-Onscreen-Framebuffer-Interface.html#CoglOnscreen" title="CoglOnscreen"><span class="type">CoglOnscreen</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.14.2.5.7.5"></a><h4>Returns</h4>
<p> the underlying SDL_Window associated with an onscreen framebuffer.</p>
</div>
<p class="since">Since: 2.0</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-2.0-experimental-SDL-Integration.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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