mutter/clutter/glx/clutter-backend-glx.c
Emmanuele Bassi 65d1a65b49 2007-03-23 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-backend.c: Clear the event queue when
	disposing the backend object; remove the initialisation
	of the backend structure members...

	* clutter/glx/clutter-backend-glx.c: ... and keep it here
	in the backends where it belongs.
2007-03-23 23:57:24 +00:00

439 lines
11 KiB
C

/* Clutter.
* An OpenGL based 'interactive canvas' library.
* Authored By Matthew Allum <mallum@openedhand.com>
* Copyright (C) 2006-2007 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "clutter-backend-glx.h"
#include "clutter-stage-glx.h"
#include "../clutter-event.h"
#include "../clutter-main.h"
#include "../clutter-debug.h"
#include "../clutter-private.h"
G_DEFINE_TYPE (ClutterBackendGlx, clutter_backend_glx, CLUTTER_TYPE_BACKEND);
/* singleton object */
static ClutterBackendGlx *backend_singleton = NULL;
/* options */
static gchar *clutter_display_name = NULL;
static gint clutter_screen = 0;
/* X error trap */
static int TrappedErrorCode = 0;
static int (*old_error_handler) (Display *, XErrorEvent *);
static gboolean
clutter_backend_glx_pre_parse (ClutterBackend *backend,
GError **error)
{
const gchar *env_string;
/* we don't fail here if DISPLAY is not set, as the user
* might pass the --display command line switch
*/
env_string = g_getenv ("DISPLAY");
if (env_string)
{
clutter_display_name = g_strdup (env_string);
env_string = NULL;
}
return TRUE;
}
static gboolean
clutter_backend_glx_post_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendGlx *backend_glx = CLUTTER_BACKEND_GLX (backend);
if (clutter_display_name)
{
CLUTTER_NOTE (MISC, "XOpenDisplay on `%s'", clutter_display_name);
backend_glx->xdpy = XOpenDisplay (clutter_display_name);
}
else
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to open display. You have to set the DISPLAY "
"environment variable, or use the --display command "
"line argument");
return FALSE;
}
if (backend_glx->xdpy)
{
CLUTTER_NOTE (MISC, "Getting the X screen");
if (clutter_screen == 0)
backend_glx->xscreen = DefaultScreen (backend_glx->xdpy);
else
{
Screen *xscreen;
xscreen = ScreenOfDisplay (backend_glx->xdpy, clutter_screen);
backend_glx->xscreen = XScreenNumberOfScreen (xscreen);
}
backend_glx->xwin_root = RootWindow (backend_glx->xdpy,
backend_glx->xscreen);
backend_glx->display_name = g_strdup (clutter_display_name);
}
g_free (clutter_display_name);
CLUTTER_NOTE (MISC, "X Display `%s' [%p] opened (screen:%d, root:%u)",
backend_glx->display_name,
backend_glx->xdpy,
backend_glx->xscreen,
(unsigned int) backend_glx->xwin_root);
return TRUE;
}
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;
}
static gboolean
clutter_backend_glx_init_stage (ClutterBackend *backend,
GError **error)
{
ClutterBackendGlx *backend_glx = CLUTTER_BACKEND_GLX (backend);
if (!backend_glx->stage)
{
ClutterStageGlx *stage_glx;
ClutterActor *stage;
stage = g_object_new (CLUTTER_TYPE_STAGE_GLX, NULL);
/* copy backend data into the stage */
stage_glx = CLUTTER_STAGE_GLX (stage);
stage_glx->xdpy = backend_glx->xdpy;
stage_glx->xwin_root = backend_glx->xwin_root;
stage_glx->xscreen = backend_glx->xscreen;
CLUTTER_NOTE (MISC, "GLX stage created (display:%p, screen:%d, root:%u)",
stage_glx->xdpy,
stage_glx->xscreen,
(unsigned int) stage_glx->xwin_root);
g_object_set_data (G_OBJECT (stage), "clutter-backend", backend);
backend_glx->stage = g_object_ref_sink (stage);
}
clutter_actor_realize (backend_glx->stage);
if (!CLUTTER_ACTOR_IS_REALIZED (backend_glx->stage))
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_INTERNAL,
"Unable to realize the main stage");
return FALSE;
}
/* 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,
CLUTTER_INIT_ERROR_BACKEND,
"Clutter needs at least version 1.2 of OpenGL");
return FALSE;
}
return TRUE;
}
static void
clutter_backend_glx_init_events (ClutterBackend *backend)
{
CLUTTER_NOTE (EVENT, "initialising the event loop");
_clutter_events_init (backend);
}
static ClutterActor *
clutter_backend_glx_get_stage (ClutterBackend *backend)
{
ClutterBackendGlx *backend_glx = CLUTTER_BACKEND_GLX (backend);
return backend_glx->stage;
}
static const GOptionEntry entries[] =
{
{
"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"
},
{ NULL }
};
static void
clutter_backend_glx_add_options (ClutterBackend *backend,
GOptionGroup *group)
{
g_option_group_add_entries (group, entries);
}
static void
clutter_backend_glx_finalize (GObject *gobject)
{
ClutterBackendGlx *backend_glx = CLUTTER_BACKEND_GLX (gobject);
g_free (backend_glx->display_name);
XCloseDisplay (backend_glx->xdpy);
if (backend_singleton)
backend_singleton = NULL;
G_OBJECT_CLASS (clutter_backend_glx_parent_class)->finalize (gobject);
}
static void
clutter_backend_glx_dispose (GObject *gobject)
{
ClutterBackendGlx *backend_glx = CLUTTER_BACKEND_GLX (gobject);
_clutter_events_uninit (CLUTTER_BACKEND (backend_glx));
if (backend_glx->stage)
{
g_object_unref (backend_glx->stage);
backend_glx->stage = NULL;
}
G_OBJECT_CLASS (clutter_backend_glx_parent_class)->dispose (gobject);
}
static GObject *
clutter_backend_glx_constructor (GType gtype,
guint n_params,
GObjectConstructParam *params)
{
GObjectClass *parent_class;
GObject *retval;
if (!backend_singleton)
{
parent_class = G_OBJECT_CLASS (clutter_backend_glx_parent_class);
retval = parent_class->constructor (gtype, n_params, params);
backend_singleton = CLUTTER_BACKEND_GLX (retval);
return retval;
}
g_warning ("Attempting to create a new backend object. This should "
"never happen, so we return the singleton instance.");
return g_object_ref (backend_singleton);
}
static void
clutter_backend_glx_class_init (ClutterBackendGlxClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
gobject_class->constructor = clutter_backend_glx_constructor;
gobject_class->dispose = clutter_backend_glx_dispose;
gobject_class->finalize = clutter_backend_glx_finalize;
backend_class->pre_parse = clutter_backend_glx_pre_parse;
backend_class->post_parse = clutter_backend_glx_post_parse;
backend_class->init_stage = clutter_backend_glx_init_stage;
backend_class->init_events = clutter_backend_glx_init_events;
backend_class->get_stage = clutter_backend_glx_get_stage;
backend_class->add_options = clutter_backend_glx_add_options;
}
static void
clutter_backend_glx_init (ClutterBackendGlx *backend_glx)
{
ClutterBackend *backend = CLUTTER_BACKEND (backend_glx);
backend->events_queue = g_queue_new ();
backend->button_click_time[0] = backend->button_click_time[1] = 0;
backend->button_number[0] = backend->button_number[1] = -1;
backend->button_x[0] = backend->button_x[1] = 0;
backend->button_y[0] = backend->button_y[1] = 0;
/* FIXME - find a way to set this stuff from XSettings */
backend->double_click_time = 250;
backend->double_click_distance = 5;
}
/* every backend must implement this function */
GType
_clutter_backend_impl_get_type (void)
{
return clutter_backend_glx_get_type ();
}
static int
error_handler(Display *xdpy,
XErrorEvent *error)
{
TrappedErrorCode = error->error_code;
return 0;
}
/**
* clutter_glx_trap_x_errors:
*
* FIXME
*
* Since: 0.4
*/
void
clutter_glx_trap_x_errors (void)
{
TrappedErrorCode = 0;
old_error_handler = XSetErrorHandler (error_handler);
}
/**
* clutter_glx_untrap_x_errors:
*
* FIXME
*
* Return value: FIXME
*
* Since: 0.4
*/
gint
clutter_glx_untrap_x_errors (void)
{
XSetErrorHandler (old_error_handler);
return TrappedErrorCode;
}
/**
* clutter_glx_get_default_display:
*
* FIXME
*
* Return value: FIXME
*
* Since: 0.4
*/
Display *
clutter_glx_get_default_display (void)
{
if (!backend_singleton)
{
g_critical ("GLX backend has not been initialised");
return NULL;
}
return backend_singleton->xdpy;
}
/**
* clutter_glx_get_default_screen:
*
* FIXME
*
* Return value: FIXME
*
* Since: 0.4
*/
gint
clutter_glx_get_default_screen (void)
{
if (!backend_singleton)
{
g_critical ("GLX backend has not been initialised");
return -1;
}
return backend_singleton->xscreen;
}
/**
* clutter_glx_get_root_window:
*
* FIXME
*
* Return value: FIXME
*
* Since: 0.4
*/
Window
clutter_glx_get_root_window (void)
{
if (!backend_singleton)
{
g_critical ("GLX backend has not been initialised");
return None;
}
return backend_singleton->xwin_root;
}