157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2008 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-frame-source.h"
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typedef struct _ClutterFrameSource ClutterFrameSource;
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struct _ClutterFrameSource
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{
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GSource source;
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GTimeVal start_time;
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guint last_time, frame_time;
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};
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static gboolean clutter_frame_source_prepare (GSource *source, gint *timeout);
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static gboolean clutter_frame_source_check (GSource *source);
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static gboolean clutter_frame_source_dispatch (GSource *source,
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GSourceFunc callback,
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gpointer user_data);
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static GSourceFuncs clutter_frame_source_funcs =
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{
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clutter_frame_source_prepare,
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clutter_frame_source_check,
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clutter_frame_source_dispatch,
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NULL
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};
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guint
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clutter_frame_source_add_full (gint priority,
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guint interval,
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GSourceFunc function,
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gpointer data,
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GDestroyNotify notify)
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{
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guint ret;
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GSource *source = g_source_new (&clutter_frame_source_funcs,
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sizeof (ClutterFrameSource));
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ClutterFrameSource *frame_source = (ClutterFrameSource *) source;
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frame_source->last_time = 0;
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frame_source->frame_time = interval;
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g_get_current_time (&frame_source->start_time);
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if (priority != G_PRIORITY_DEFAULT)
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g_source_set_priority (source, priority);
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g_source_set_callback (source, function, data, notify);
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ret = g_source_attach (source, NULL);
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g_source_unref (source);
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return ret;
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}
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guint
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clutter_frame_source_add (guint interval,
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GSourceFunc function,
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gpointer data)
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{
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return clutter_frame_source_add_full (G_PRIORITY_DEFAULT,
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interval, function, data, NULL);
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}
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static guint
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clutter_frame_source_get_ticks (ClutterFrameSource *frame_source)
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{
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GTimeVal time_now;
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g_source_get_current_time ((GSource *) frame_source, &time_now);
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return (time_now.tv_sec - frame_source->start_time.tv_sec) * 1000
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+ (time_now.tv_usec - frame_source->start_time.tv_usec) / 1000;
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}
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static gboolean
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clutter_frame_source_prepare (GSource *source, gint *timeout)
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{
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ClutterFrameSource *frame_source = (ClutterFrameSource *) source;
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guint now = clutter_frame_source_get_ticks (frame_source);
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/* If time has gone backwards or the time since the last frame is
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greater than the two frames worth then reset the time and do a
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frame now */
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if (frame_source->last_time > now || now - frame_source->last_time
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> frame_source->frame_time * 2)
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{
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frame_source->last_time = now - frame_source->frame_time;
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if (timeout)
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*timeout = 0;
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return TRUE;
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}
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else if (now - frame_source->last_time >= frame_source->frame_time)
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{
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if (timeout)
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*timeout = 0;
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return TRUE;
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}
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else
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{
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if (timeout)
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*timeout = frame_source->frame_time + frame_source->last_time - now;
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return FALSE;
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}
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}
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static gboolean
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clutter_frame_source_check (GSource *source)
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{
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return clutter_frame_source_prepare (source, NULL);
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}
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static gboolean
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clutter_frame_source_dispatch (GSource *source,
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GSourceFunc callback,
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gpointer user_data)
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{
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ClutterFrameSource *frame_source = (ClutterFrameSource *) source;
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if ((* callback) (user_data))
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{
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frame_source->last_time += frame_source->frame_time;
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return TRUE;
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}
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else
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return FALSE;
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}
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