gstreamer/gst-libs/gst/gl/wayland/wayland_event_source.c

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/*
* GStreamer
* Copyright (C) 2010 Intel Corporation.
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* Authors:
* Matthew Allum
* Robert Bragg
* Kristian Høgsberg
*/
/* code originally from clutter's wayland backend found here
* http://git.gnome.org/browse/clutter/tree/clutter/wayland/clutter-event-wayland.c
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdint.h>
#include <stdlib.h>
#include <wayland-client.h>
#include <gst/gst.h>
#include "wayland_event_source.h"
#define GST_CAT_DEFAULT gst_gl_wayland_event_source_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static void
init_debug (void)
{
static volatile gsize _debug;
if (g_once_init_enter (&_debug)) {
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glwaylandeventsource", 0,
"OpenGL Wayland event source");
g_once_init_leave (&_debug, 1);
}
}
typedef struct _WaylandEventSource
{
GSource source;
GPollFD pfd;
uint32_t mask;
struct wl_display *display;
struct wl_event_queue *queue;
gboolean reading;
} WaylandEventSource;
static gboolean
wayland_event_source_prepare (GSource * base, gint * timeout)
{
WaylandEventSource *source = (WaylandEventSource *) base;
*timeout = -1;
/* we may be called multiple times for prepare */
if (source->reading)
wl_display_cancel_read (source->display);
if (source->queue) {
if (wl_display_prepare_read_queue (source->display, source->queue) != 0)
return TRUE;
} else {
if (wl_display_prepare_read (source->display) != 0)
return TRUE;
}
source->reading = TRUE;
/* FIXME: this may return EAGAIN if the fd is full */
if (wl_display_flush (source->display) < 0)
g_critical ("Failed to flush Wayland connection\n");
return FALSE;
}
static gboolean
wayland_event_source_check (GSource * base)
{
WaylandEventSource *source = (WaylandEventSource *) base;
source->reading = FALSE;
if (source->pfd.revents & G_IO_IN) {
if (wl_display_read_events (source->display) == 0)
return TRUE;
} else {
wl_display_cancel_read (source->display);
}
return FALSE;
}
static gboolean
wayland_event_source_dispatch (GSource * base,
GSourceFunc callback, gpointer data)
{
WaylandEventSource *source = (WaylandEventSource *) base;
if (source->queue) {
wl_display_dispatch_queue_pending (source->display, source->queue);
} else {
wl_display_dispatch_pending (source->display);
}
source->pfd.revents = 0;
if (callback)
callback (data);
return TRUE;
}
static void
wayland_event_source_finalize (GSource * base)
{
WaylandEventSource *source = (WaylandEventSource *) base;
if (source->reading) {
wl_display_cancel_read (source->display);
}
source->reading = FALSE;
}
static GSourceFuncs wayland_event_source_funcs = {
wayland_event_source_prepare,
wayland_event_source_check,
wayland_event_source_dispatch,
wayland_event_source_finalize
};
GSource *
wayland_event_source_new (struct wl_display *display,
struct wl_event_queue *queue)
{
WaylandEventSource *source;
init_debug ();
source = (WaylandEventSource *)
g_source_new (&wayland_event_source_funcs, sizeof (WaylandEventSource));
source->display = display;
source->queue = queue;
source->pfd.fd = wl_display_get_fd (display);
source->pfd.events = G_IO_IN | G_IO_ERR;
g_source_add_poll (&source->source, &source->pfd);
return &source->source;
}