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mutter-performance-source/clutter/clutter-main.c
Matthew Allum 83700e97c7 2007-01-04 Matthew Allum <mallum@openedhand.com> 
* clutter/clutter-actor.c:
        * clutter/clutter-actor.h:
        Add new set_width/height API calls.
        Tweak scaling by reseting matrix.
        Make set_opactiy() take parent opacity into account.
        Fix clipping.

        * clutter/clutter-alpha.c:
        Add more sine functionality.

        * clutter/clutter-behaviour-opacity.c:
        Dont make a copy of all applied actors but use a foreach()

        * clutter/clutter-behaviour-scale.c:
        Give correct limits to propertys.
        Tweak gravity a little more.
        Update docs.
:
        * clutter/clutter-behaviour.c: (clutter_behaviour_remove):
        Minor warning text change.

        * clutter/clutter-feature.c: (clutter_feature_wait_for_vblank):
        Minor dri ioctl tweak.

        * clutter/clutter-label.c:
        * clutter/clutter-label.h:
        Add new label_full api call.
2007-01-04 19:56:01 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-main
* @short_description: Various 'global' clutter functions.
*
* Functions to retrieve various global Clutter resources and other utility
* functions for mainloops, events and threads
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include "clutter-main.h"
#include "clutter-feature.h"
#include "clutter-actor.h"
#include "clutter-stage.h"
#include "clutter-private.h"
#include "clutter-debug.h"
static gboolean clutter_is_initialized = FALSE;
static gboolean clutter_show_fps = FALSE;
static gboolean clutter_fatal_warnings = FALSE;
static gchar *clutter_display_name = NULL;
static int clutter_screen = 0;
guint clutter_debug_flags = 0; /* global clutter debug flag */
#ifdef CLUTTER_ENABLE_DEBUG
static const GDebugKey clutter_debug_keys[] = {
{ "misc", CLUTTER_DEBUG_MISC },
{ "actor", CLUTTER_DEBUG_ACTOR },
{ "texture", CLUTTER_DEBUG_TEXTURE },
{ "event", CLUTTER_DEBUG_EVENT },
{ "paint", CLUTTER_DEBUG_PAINT },
{ "gl", CLUTTER_DEBUG_GL },
{ "alpha", CLUTTER_DEBUG_ALPHA },
{ "behaviour", CLUTTER_DEBUG_BEHAVIOUR },
{ "pango", CLUTTER_DEBUG_PANGO },
};
#endif /* CLUTTER_ENABLE_DEBUG */
typedef struct
{
GSource source;
Display *display;
GPollFD event_poll_fd;
}
ClutterXEventSource;
typedef void (*ClutterXEventFunc) (XEvent *xev, gpointer user_data);
static ClutterMainContext *ClutterCntx = NULL;
static gboolean
x_event_prepare (GSource *source,
gint *timeout)
{
Display *display = ((ClutterXEventSource*)source)->display;
*timeout = -1;
return XPending (display);
}
static gboolean
x_event_check (GSource *source)
{
ClutterXEventSource *display_source = (ClutterXEventSource*)source;
gboolean retval;
if (display_source->event_poll_fd.revents & G_IO_IN)
retval = XPending (display_source->display);
else
retval = FALSE;
return retval;
}
static gboolean
x_event_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
Display *display = ((ClutterXEventSource*)source)->display;
ClutterXEventFunc event_func = (ClutterXEventFunc) callback;
XEvent xev;
if (XPending (display))
{
XNextEvent (display, &xev);
if (event_func)
(*event_func) (&xev, user_data);
}
return TRUE;
}
static const GSourceFuncs x_event_funcs = {
x_event_prepare,
x_event_check,
x_event_dispatch,
NULL
};
static void
translate_key_event (ClutterKeyEvent *event,
XEvent *xevent)
{
event->type = xevent->xany.type == KeyPress ? CLUTTER_KEY_PRESS
: CLUTTER_KEY_RELEASE;
event->time = xevent->xkey.time;
event->modifier_state = xevent->xkey.state; /* FIXME: handle modifiers */
event->hardware_keycode = xevent->xkey.keycode;
event->keyval = XKeycodeToKeysym(xevent->xkey.display,
xevent->xkey.keycode,
0 ); /* FIXME: index with modifiers */
}
static void
translate_button_event (ClutterButtonEvent *event,
XEvent *xevent)
{
/* FIXME: catch double click */
CLUTTER_NOTE (EVENT, " button event at %ix%i",
xevent->xbutton.x,
xevent->xbutton.y);
event->type = xevent->xany.type == ButtonPress ? CLUTTER_BUTTON_PRESS
: CLUTTER_BUTTON_RELEASE;
event->time = xevent->xbutton.time;
event->x = xevent->xbutton.x;
event->y = xevent->xbutton.y;
event->modifier_state = xevent->xbutton.state; /* includes button masks */
event->button = xevent->xbutton.button;
}
static void
translate_motion_event (ClutterMotionEvent *event,
XEvent *xevent)
{
event->type = CLUTTER_MOTION;
event->time = xevent->xbutton.time;
event->x = xevent->xmotion.x;
event->y = xevent->xmotion.y;
event->modifier_state = xevent->xmotion.state;
}
static void
clutter_dispatch_x_event (XEvent *xevent,
gpointer data)
{
ClutterMainContext *ctx = CLUTTER_CONTEXT ();
ClutterEvent event;
ClutterStage *stage = ctx->stage;
gboolean emit_input_event = FALSE;
switch (xevent->type)
{
case Expose:
{
XEvent foo_xev;
/* Cheap compress */
while (XCheckTypedWindowEvent(ctx->xdpy,
xevent->xexpose.window,
Expose,
&foo_xev));
/* FIXME: need to make stage an 'actor' so can que
* a paint direct from there rather than hack here...
*/
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
}
break;
case KeyPress:
translate_key_event ((ClutterKeyEvent *) &event, xevent);
g_signal_emit_by_name (stage, "key-press-event", &event);
emit_input_event = TRUE;
break;
case KeyRelease:
translate_key_event ((ClutterKeyEvent *) &event, xevent);
g_signal_emit_by_name (stage, "key-release-event", &event);
emit_input_event = TRUE;
break;
case ButtonPress:
translate_button_event ((ClutterButtonEvent *) &event, xevent);
g_signal_emit_by_name (stage, "button-press-event", &event);
emit_input_event = TRUE;
break;
case ButtonRelease:
translate_button_event ((ClutterButtonEvent *) &event, xevent);
g_signal_emit_by_name (stage, "button-release-event", &event);
emit_input_event = TRUE;
break;
case MotionNotify:
translate_motion_event ((ClutterMotionEvent *) &event, xevent);
g_signal_emit_by_name (stage, "motion-event", &event);
emit_input_event = TRUE;
break;
}
if (emit_input_event)
g_signal_emit_by_name (stage, "input-event", &event);
}
static void
events_init()
{
ClutterMainContext *clutter_context;
GMainContext *gmain_context;
int connection_number;
GSource *source;
ClutterXEventSource *display_source;
clutter_context = clutter_context_get_default ();
gmain_context = g_main_context_default ();
g_main_context_ref (gmain_context);
connection_number = ConnectionNumber (clutter_context->xdpy);
source = g_source_new ((GSourceFuncs *)&x_event_funcs,
sizeof (ClutterXEventSource));
display_source = (ClutterXEventSource *)source;
display_source->event_poll_fd.fd = connection_number;
display_source->event_poll_fd.events = G_IO_IN;
display_source->display = clutter_context->xdpy;
g_source_add_poll (source, &display_source->event_poll_fd);
g_source_set_can_recurse (source, TRUE);
g_source_set_callback (source,
(GSourceFunc) clutter_dispatch_x_event,
NULL /* no userdata */, NULL);
g_source_attach (source, gmain_context);
g_source_unref (source);
}
static gboolean
clutter_want_fps (void)
{
return clutter_show_fps;
}
/**
* clutter_redraw:
*
* FIXME
*/
void
clutter_redraw (void)
{
ClutterMainContext *ctx = CLUTTER_CONTEXT();
ClutterStage *stage = ctx->stage;
ClutterColor stage_color;
static GTimer *timer = NULL;
static guint timer_n_frames = 0;
/* FIXME: Should move all this into stage...
*/
CLUTTER_NOTE (PAINT, " Redraw enter");
if (clutter_want_fps ())
{
if (!timer)
timer = g_timer_new ();
}
clutter_stage_get_color (stage, &stage_color);
glClearColor(((float) stage_color.red / 0xff * 1.0),
((float) stage_color.green / 0xff * 1.0),
((float) stage_color.blue / 0xff * 1.0),
0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
clutter_actor_paint (CLUTTER_ACTOR (stage));
if (clutter_stage_get_xwindow (stage))
{
clutter_feature_wait_for_vblank ();
glXSwapBuffers(ctx->xdpy, clutter_stage_get_xwindow (stage));
}
else
{
glXWaitGL();
CLUTTER_GLERR();
}
if (clutter_want_fps ())
{
timer_n_frames++;
if (g_timer_elapsed (timer, NULL) >= 1.0)
{
g_print ("*** FPS: %i ***\n", timer_n_frames);
timer_n_frames = 0;
g_timer_start (timer);
}
}
CLUTTER_NOTE (PAINT, "Redraw leave");
}
/**
* clutter_main_quit:
*
* Terminates the Clutter mainloop.
*/
void
clutter_main_quit (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
g_return_if_fail (context->main_loops != NULL);
g_main_loop_quit (context->main_loops->data);
}
/**
* clutter_main_level:
*
* Retrieves the depth of the Clutter mainloop.
*
* Return value: The level of the mainloop.
*/
gint
clutter_main_level (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
return context->main_loop_level;
}
/**
* clutter_main:
*
* Starts the Clutter mainloop.
*/
void
clutter_main (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
GMainLoop *loop;
if (!clutter_is_initialized)
{
g_warning ("Called clutter_main() but Clutter wasn't initialised. "
"You must call clutter_init() first.");
return;
}
context->main_loop_level++;
loop = g_main_loop_new (NULL, TRUE);
context->main_loops = g_slist_prepend (context->main_loops, loop);
if (g_main_loop_is_running (context->main_loops->data))
{
g_main_loop_run (loop);
}
context->main_loops = g_slist_remove (context->main_loops, loop);
g_main_loop_unref (loop);
context->main_loop_level--;
if (context->main_loop_level == 0)
{
clutter_actor_destroy (CLUTTER_ACTOR (context->stage));
g_free (context);
}
}
/**
* clutter_threads_enter:
*
* Locks the Clutter thread lock.
*/
void
clutter_threads_enter(void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
g_mutex_lock (context->gl_lock);
}
/**
* clutter_threads_leave:
*
* Unlocks the Clutter thread lock.
*/
void
clutter_threads_leave (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
g_mutex_unlock (context->gl_lock);
}
/**
* clutter_xdisplay:
*
* Retrieves the X display that Clutter is using
*
* Return value: A pointer to an X Display structure.
*/
Display*
clutter_xdisplay (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
return context->xdpy;
}
/**
* clutter_xscreen:
*
* Retrieves the X screen that Clutter is using.
*
* Return value: the X screen ID
*/
int
clutter_xscreen (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
return context->xscreen;
}
/**
* clutter_root_xwindow:
*
* FIXME
*
* Return value: FIXME
*/
Window
clutter_root_xwindow (void)
{
ClutterMainContext *context = CLUTTER_CONTEXT ();
return context->xwin_root;
}
/**
* clutter_want_debug:
*
* Check if clutter has debugging turned on.
*
* Return value: TRUE if debugging is turned on, FALSE otherwise.
*/
gboolean
clutter_want_debug (void)
{
return clutter_debug_flags != 0;
}
ClutterMainContext*
clutter_context_get_default (void)
{
if (!ClutterCntx)
{
ClutterMainContext *ctx;
ctx = g_new0 (ClutterMainContext, 1);
ctx->is_initialized = FALSE;
ClutterCntx = ctx;
}
return ClutterCntx;
}
static gboolean
is_gl_version_at_least_12 (void)
{
#define NON_VENDOR_VERSION_MAX_LEN 32
gchar non_vendor_version[NON_VENDOR_VERSION_MAX_LEN];
const gchar *version;
gint i = 0;
version = (const gchar*) glGetString (GL_VERSION);
while ( ((version[i] <= '9' && version[i] >= '0') || version[i] == '.')
&& i < NON_VENDOR_VERSION_MAX_LEN)
{
non_vendor_version[i] = version[i];
i++;
}
non_vendor_version[i] = '\0';
if (strstr (non_vendor_version, "1.0") == NULL
&& strstr (non_vendor_version, "1.0") == NULL)
return TRUE;
return FALSE;
}
#ifdef CLUTTER_ENABLE_DEBUG
static gboolean
clutter_arg_debug_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_debug_flags |=
g_parse_debug_string (value,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
return TRUE;
}
static gboolean
clutter_arg_no_debug_cb (const char *key,
const char *value,
gpointer user_data)
{
clutter_debug_flags &=
~g_parse_debug_string (value,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
return TRUE;
}
#endif /* CLUTTER_ENABLE_DEBUG */
static GOptionEntry clutter_args[] = {
{ "display", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_STRING, &clutter_display_name,
"X display to use", "DISPLAY" },
{ "screen", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_INT, &clutter_screen,
"X screen to use", "SCREEN" },
{ "clutter-show-fps", 0, 0, G_OPTION_ARG_NONE, &clutter_show_fps,
"Show frames per second", NULL },
{ "g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &clutter_fatal_warnings,
"Make all warnings fatal", NULL },
#ifdef CLUTTER_ENABLE_DEBUG
{ "clutter-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_debug_cb,
"Clutter debugging flags to set", "FLAGS" },
{ "clutter-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_no_debug_cb,
"Clutter debugging flags to unset", "FLAGS" },
#endif /* CLUTTER_ENABLE_DEBUG */
{ NULL, },
};
/* pre_parse_hook: initialise variables depending on environment
* variables; these variables might be overridden by the command
* line arguments that are going to be parsed after.
*/
static gboolean
pre_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
const char *env_string;
if (clutter_is_initialized)
return TRUE;
g_type_init ();
if (!g_thread_supported ())
g_thread_init (NULL);
#ifdef CLUTTER_ENABLE_DEBUG
env_string = g_getenv ("CLUTTER_DEBUG");
if (env_string != NULL)
{
clutter_debug_flags =
g_parse_debug_string (env_string,
clutter_debug_keys,
G_N_ELEMENTS (clutter_debug_keys));
env_string = NULL;
}
#endif /* CLUTTER_ENABLE_DEBUG */
env_string = g_getenv ("CLUTTER_SHOW_FPS");
if (env_string)
clutter_show_fps = TRUE;
env_string = g_getenv ("DISPLAY");
if (env_string)
clutter_display_name = g_strdup (env_string);
return TRUE;
}
/* post_parse_hook: initialise the context and data structures
* and opens the X display
*/
static gboolean
post_parse_hook (GOptionContext *context,
GOptionGroup *group,
gpointer data,
GError **error)
{
ClutterMainContext *clutter_context;
if (clutter_is_initialized)
return TRUE;
if (clutter_fatal_warnings)
{
GLogLevelFlags fatal_mask;
fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
g_log_set_always_fatal (fatal_mask);
}
clutter_context = clutter_context_get_default ();
clutter_context->main_loops = NULL;
clutter_context->main_loop_level = 0;
/* either we got this with the DISPLAY envvar or via the
* --display command line switch; if both failed, then
* we'll fail later when we return in clutter_init()
*/
if (clutter_display_name)
clutter_context->xdpy = XOpenDisplay (clutter_display_name);
if (clutter_context->xdpy)
{
if (clutter_screen == 0)
clutter_context->xscreen = DefaultScreen (clutter_context->xdpy);
else
{
Screen *xscreen;
xscreen = ScreenOfDisplay (clutter_context->xdpy, clutter_screen);
clutter_context->xscreen = XScreenNumberOfScreen (xscreen);
}
clutter_context->xwin_root = RootWindow (clutter_context->xdpy,
clutter_context->xscreen);
/* we don't need it anymore */
g_free (clutter_display_name);
}
clutter_context->font_map = PANGO_FT2_FONT_MAP (pango_ft2_font_map_new ());
pango_ft2_font_map_set_resolution (clutter_context->font_map, 96.0, 96.0);
clutter_context->gl_lock = g_mutex_new ();
clutter_is_initialized = TRUE;
return TRUE;
}
/**
* clutter_get_option_group:
*
* Returns a #GOptionGroup for the command line arguments recognized
* by Clutter. You should add this group to your #GOptionContext with
* g_option_context_add_group(), if you are using g_option_context_parse()
* to parse your commandline arguments.
*
* Return value: a GOptionGroup for the commandline arguments
* recognized by Clutter
*
* Since: 0.2
*/
GOptionGroup *
clutter_get_option_group (void)
{
GOptionGroup *group;
group = g_option_group_new ("clutter",
"Clutter Options",
"Show Clutter Options",
NULL,
NULL);
g_option_group_set_parse_hooks (group, pre_parse_hook, post_parse_hook);
g_option_group_add_entries (group, clutter_args);
return group;
}
static gboolean
clutter_parse_args (int *argc,
char ***argv)
{
GOptionContext *option_context;
GOptionGroup *clutter_group;
GError *error = NULL;
if (clutter_is_initialized)
return TRUE;
option_context = g_option_context_new (NULL);
g_option_context_set_ignore_unknown_options (option_context, TRUE);
g_option_context_set_help_enabled (option_context, FALSE);
clutter_group = clutter_get_option_group ();
g_option_context_set_main_group (option_context, clutter_group);
if (!g_option_context_parse (option_context, argc, argv, &error))
{
g_warning ("%s", error->message);
g_error_free (error);
}
g_option_context_free (option_context);
return TRUE;
}
GQuark
clutter_init_error_quark (void)
{
return g_quark_from_static_string ("clutter-init-error-quark");
}
static gboolean
clutter_stage_init (ClutterMainContext *context,
GError **error)
{
context->stage = CLUTTER_STAGE (clutter_stage_get_default ());
if (!CLUTTER_IS_STAGE (context->stage))
{
g_set_error (error, clutter_init_error_quark (),
CLUTTER_INIT_ERROR_INTERNAL,
"Unable to create the main stage");
return FALSE;
}
g_object_ref_sink (context->stage);
/* Realize to get context */
clutter_actor_realize (CLUTTER_ACTOR (context->stage));
if (!CLUTTER_ACTOR_IS_REALIZED (CLUTTER_ACTOR (context->stage)))
{
g_set_error (error, clutter_init_error_quark (),
CLUTTER_INIT_ERROR_INTERNAL,
"Unable to realize the main stage");
return FALSE;
}
return TRUE;
}
/**
* clutter_init_with_args:
* @argc: a pointer to the number of command line arguments
* @argv: a pointer to the array of comman line arguments
* @parameter_string: a string which is displayed in the
* first line of <option>--help</option> output, after
* <literal><replaceable>programname</replaceable> [OPTION...]</literal>
* @entries: a %NULL terminated array of #GOptionEntry<!-- -->s
* describing the options of your program
* @translation_domain: a translation domain to use for translating
* the <option>--help</option> output for the options in @entries
* with gettext(), or %NULL
* @error: a return location for a #GError
*
* This function does the same work as clutter_init(). Additionally,
* it allows you to add your own command line options, and it
* automatically generates nicely formatted <option>--help</option>
* output. Note that your program will be terminated after writing
* out the help output. Also note that, in case of error, the
* error message will be placed inside @error instead of being
* printed on the display.
*
* Return value: %CLUTTER_INIT_SUCCESS if Clutter has been successfully
* initialised, or other values or #ClutterInitError in case of
* error.
*
* Since: 0.2
*/
ClutterInitError
clutter_init_with_args (int *argc,
char ***argv,
char *parameter_string,
GOptionEntry *entries,
char *translation_domain,
GError **error)
{
ClutterMainContext *clutter_context;
GOptionContext *context;
GOptionGroup *group;
gboolean res;
GError *stage_error;
if (clutter_is_initialized)
return CLUTTER_INIT_SUCCESS;
if (!XInitThreads())
{
g_set_error (error, clutter_init_error_quark (),
CLUTTER_INIT_ERROR_THREADS,
"Unable to initialise the X threading");
return CLUTTER_INIT_ERROR_THREADS;
}
group = clutter_get_option_group ();
context = g_option_context_new (parameter_string);
g_option_context_add_group (context, group);
if (entries)
g_option_context_add_main_entries (context, entries, translation_domain);
res = g_option_context_parse (context, argc, argv, error);
g_option_context_free (context);
/* if res is FALSE, the error is filled for
* us by g_option_context_parse()
*/
if (!res)
return CLUTTER_INIT_ERROR_INTERNAL;
clutter_context = clutter_context_get_default ();
if (!clutter_context->xdpy)
{
g_set_error (error, clutter_init_error_quark (),
CLUTTER_INIT_ERROR_DISPLAY,
"Unable to connect to X DISPLAY. You should either "
"set the DISPLAY environment variable or use the "
"--display command line switch");
return CLUTTER_INIT_ERROR_DISPLAY;
}
stage_error = NULL;
if (!clutter_stage_init (clutter_context, &stage_error))
{
g_propagate_error (error, stage_error);
return CLUTTER_INIT_ERROR_INTERNAL;
}
/* At least GL 1.2 is needed for CLAMP_TO_EDGE */
if (!is_gl_version_at_least_12 ())
{
g_set_error (error, clutter_init_error_quark (),
CLUTTER_INIT_ERROR_OPENGL,
"Clutter needs at least version 1.2 of OpenGL");
return CLUTTER_INIT_ERROR_OPENGL;
}
events_init ();
return CLUTTER_INIT_SUCCESS;
}
/**
* clutter_init:
* @argc: The number of arguments in @argv
* @argv: A pointer to an array of arguments.
*
* It will initialise everything needed to operate with Clutter and
* parses some standard command line options. @argc and @argv are
* adjusted accordingly so your own code will never see those standard
* arguments.
*
* Return value: 1 on success, < 0 on failure.
*/
ClutterInitError
clutter_init (int *argc,
char ***argv)
{
ClutterMainContext *context;
GError *stage_error;
if (clutter_is_initialized)
return CLUTTER_INIT_SUCCESS;
if (!XInitThreads())
return CLUTTER_INIT_ERROR_THREADS;
clutter_parse_args (argc, argv);
context = clutter_context_get_default ();
if (!context->xdpy)
{
g_critical ("Unable to connect to X DISPLAY. You should either "
"set the DISPLAY environment variable or use the "
"--display command line switch");
return CLUTTER_INIT_ERROR_DISPLAY;
}
stage_error = NULL;
if (!clutter_stage_init (context, &stage_error))
{
g_critical (stage_error->message);
g_error_free (stage_error);
return CLUTTER_INIT_ERROR_INTERNAL;
}
/* At least GL 1.2 is needed for CLAMP_TO_EDGE */
if (!is_gl_version_at_least_12 ())
{
g_critical ("Clutter needs at least version 1.2 of OpenGL");
return CLUTTER_INIT_ERROR_OPENGL;
}
events_init ();
return 1;
}
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