mutter/cogl/cogl-glib-source.c

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-glib-source.h"
#include "cogl-poll.h"
typedef struct _CoglGLibSource
{
GSource source;
CoglRenderer *renderer;
GArray *poll_fds;
int poll_fds_age;
int64_t expiration_time;
} CoglGLibSource;
static CoglBool
cogl_glib_source_prepare (GSource *source, int *timeout)
{
CoglGLibSource *cogl_source = (CoglGLibSource *) source;
CoglPollFD *poll_fds;
int n_poll_fds;
int64_t cogl_timeout;
int age;
int i;
age = cogl_poll_renderer_get_info (cogl_source->renderer,
&poll_fds,
&n_poll_fds,
&cogl_timeout);
/* We have to be careful not to call g_source_add/remove_poll unless
* the FDs have changed because it will cause the main loop to
* immediately wake up. If we call it every time the source is
* prepared it will effectively never go idle. */
if (age != cogl_source->poll_fds_age)
{
/* Remove any existing polls before adding the new ones */
for (i = 0; i < cogl_source->poll_fds->len; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
g_source_remove_poll (source, poll_fd);
}
g_array_set_size (cogl_source->poll_fds, n_poll_fds);
for (i = 0; i < n_poll_fds; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
poll_fd->fd = poll_fds[i].fd;
g_source_add_poll (source, poll_fd);
}
}
cogl_source->poll_fds_age = age;
/* Update the events */
for (i = 0; i < n_poll_fds; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
poll_fd->events = poll_fds[i].events;
poll_fd->revents = 0;
}
if (cogl_timeout == -1)
{
*timeout = -1;
cogl_source->expiration_time = -1;
}
else
{
/* Round up to ensure that we don't try again too early */
*timeout = (cogl_timeout + 999) / 1000;
cogl_source->expiration_time = (g_source_get_time (source) +
cogl_timeout);
}
return *timeout == 0;
}
static CoglBool
cogl_glib_source_check (GSource *source)
{
CoglGLibSource *cogl_source = (CoglGLibSource *) source;
int i;
if (cogl_source->expiration_time >= 0 &&
g_source_get_time (source) >= cogl_source->expiration_time)
return TRUE;
for (i = 0; i < cogl_source->poll_fds->len; i++)
{
GPollFD *poll_fd = &g_array_index (cogl_source->poll_fds, GPollFD, i);
if (poll_fd->revents != 0)
return TRUE;
}
return FALSE;
}
static CoglBool
cogl_glib_source_dispatch (GSource *source,
GSourceFunc callback,
void *user_data)
{
CoglGLibSource *cogl_source = (CoglGLibSource *) source;
CoglPollFD *poll_fds =
(CoglPollFD *) &g_array_index (cogl_source->poll_fds, GPollFD, 0);
cogl_poll_renderer_dispatch (cogl_source->renderer,
poll_fds,
cogl_source->poll_fds->len);
return TRUE;
}
static void
cogl_glib_source_finalize (GSource *source)
{
CoglGLibSource *cogl_source = (CoglGLibSource *) source;
g_array_free (cogl_source->poll_fds, TRUE);
}
static GSourceFuncs
cogl_glib_source_funcs =
{
cogl_glib_source_prepare,
cogl_glib_source_check,
cogl_glib_source_dispatch,
cogl_glib_source_finalize
};
GSource *
cogl_glib_renderer_source_new (CoglRenderer *renderer,
int priority)
{
GSource *source;
CoglGLibSource *cogl_source;
source = g_source_new (&cogl_glib_source_funcs,
sizeof (CoglGLibSource));
cogl_source = (CoglGLibSource *) source;
cogl_source->renderer = renderer;
cogl_source->poll_fds = g_array_new (FALSE, FALSE, sizeof (GPollFD));
if (priority != G_PRIORITY_DEFAULT)
g_source_set_priority (source, priority);
return source;
}
GSource *
cogl_glib_source_new (CoglContext *context,
int priority)
{
return cogl_glib_renderer_source_new (cogl_context_get_renderer (context),
priority);
}