mutter/clutter/clutter-feature.c

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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-feature
* @short_description: functions to query available GL features ay runtime
*
* Functions to query available GL features ay runtime
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <GL/glx.h>
#include <GL/gl.h>
2006-11-21 Emmanuele Bassi <ebassi@openedhand.com> * configure.ac: Enable debug messages also when --enable-debug is set to "minimum". * clutter/Makefile.am: * clutter/clutter-debug.h: Move all debugging macros inside this private header; make all debug macros depend on the CLUTTER_ENABLE_DEBUG compile time define, controlled by the --enable-debug configure switch; add G_LOG_DOMAIN define. * clutter/clutter-main.c: Clean up the debug stuff; add command line argument parsing using GOption; the debug messages now are triggered like this: CLUTTER_DEBUG=section:section:... clutter-app or like this: clutter-app --clutter-debug=section:section:... where "section" is one of the sections listed in clutter-main.c, or "all", for all sections; each section is bound to a flag, which can be used to define a domain when adding a debug note using the CLUTTER_NOTE() macro; the old CLUTTER_DBG() macro is just a wrapper around that, under the CLUTTER_DEBUG_MISC domain; CLUTTER_NOTE() is used like this: CLUTTER_NOTE (DOMAIN, log-function); where log function is g_printerr(), g_message(), g_warning(), g_critical() or directly g_log() - for instance: CLUTTER_NOTE (PANGO, g_warning ("Cache miss: %d", glyph)); will print the warning only if the "pango" flag has been set to the CLUTTER_DEBUG envvar or passed to the --clutter-debug command line argument. similar to CLUTTER_SHOW_FPS, there's also the --clutter-show-fps command line switch; also, the --display and --screen command line switches have been added: the first overrides the DISPLAY envvar and the second controls the X screen used by Clutter to get the root window on the display. * clutter/clutter-main.h: * clutter/clutter-main.c: Add extended support for GOption in Clutter; use clutter_init_with_args() to let Clutter parse your own command line arguments; use instead clutter_get_option_group() to get the GOptionGroup used by Clutter if you want to do the parsing yourself with g_option_context_parse(). The init sequence has been verified, updated and moved into common functions where possible. * clutter/pango/pangoclutter-render.c: * clutter/*.c: Include "clutter-debug.h" where needed; use CLUTTER_NOTE() instead of CLUTTER_DBG(). * examples/super-oh.c: Use the new clutter_init_with_args() function, and add a --num-hands command line switch to the SuperOH example code controlling the number of hands at runtime.
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#include <dlfcn.h>
#include "clutter-feature.h"
#include "clutter-main.h"
#include "clutter-private.h"
#include "clutter-debug.h"
typedef void (*FuncPtr) (void);
typedef int (*GLXGetVideoSyncProc) (unsigned int *count);
typedef int (*GLXWaitVideoSyncProc) (int divisor,
int remainder,
unsigned int *count);
typedef FuncPtr (*GLXGetProcAddressProc) (const guint8 *procName);
typedef struct ClutterFeatureFuncs
{
GLXGetVideoSyncProc get_video_sync;
GLXWaitVideoSyncProc wait_video_sync;
} ClutterFeatureFuncs;
typedef enum ClutterVBlankType
{
CLUTTER_VBLANK_NONE = 0,
CLUTTER_VBLANK_GLX,
CLUTTER_VBLANK_DRI
} ClutterVBlankType;
typedef struct ClutterFeatures
{
ClutterFeatureFlags flags;
ClutterFeatureFuncs funcs;
gint dri_fd;
ClutterVBlankType vblank_type;
guint features_set : 1;
} ClutterFeatures;
static ClutterFeatures* __features = NULL;
G_LOCK_DEFINE_STATIC (__features);
/* #ifdef linux */
#define DRM_VBLANK_RELATIVE 0x1;
struct drm_wait_vblank_request {
int type;
unsigned int sequence;
unsigned long signal;
};
struct drm_wait_vblank_reply {
int type;
unsigned int sequence;
long tval_sec;
long tval_usec;
};
typedef union drm_wait_vblank {
struct drm_wait_vblank_request request;
struct drm_wait_vblank_reply reply;
} drm_wait_vblank_t;
#define DRM_IOCTL_BASE 'd'
#define DRM_IOWR(nr,type) _IOWR(DRM_IOCTL_BASE,nr,type)
#define DRM_IOCTL_WAIT_VBLANK DRM_IOWR(0x3a, drm_wait_vblank_t)
static int drm_wait_vblank(int fd, drm_wait_vblank_t *vbl)
{
int ret, rc;
do
{
ret = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, vbl);
vbl->request.type &= ~DRM_VBLANK_RELATIVE;
rc = errno;
}
while (ret && rc == EINTR);
return rc;
}
/* #endif */
/* Note must be called after context created */
static gboolean
check_gl_extension (const gchar *name,
const gchar *ext)
{
gchar *end;
gint name_len, n;
if (name == NULL || ext == NULL)
return FALSE;
end = (gchar*)(ext + strlen(ext));
name_len = strlen(name);
while (ext < end)
{
n = strcspn(ext, " ");
if ((name_len == n) && (!strncmp(name, ext, n)))
return TRUE;
ext += (n + 1);
}
return FALSE;
}
static FuncPtr
get_proc_address (const gchar *name)
{
static GLXGetProcAddressProc get_proc_func = NULL;
static void *dlhand = NULL;
if (get_proc_func == NULL && dlhand == NULL)
{
dlhand = dlopen (NULL, RTLD_LAZY);
if (dlhand)
{
dlerror ();
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddress");
if (dlerror () != NULL)
{
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddressARB");
}
if (dlerror () != NULL)
{
get_proc_func = NULL;
g_warning ("failed to bind GLXGetProcAddress "
"or GLXGetProcAddressARB");
}
}
}
if (get_proc_func)
return get_proc_func ((unsigned char*) name);
return NULL;
}
static gboolean
check_vblank_env (const char *name)
{
const char *val;
#if 0
val = getenv("CLUTTER_VBLANK");
#endif
val = clutter_vblank_method ();
if (val && !strcasecmp(val, name))
return TRUE;
return FALSE;
}
/* clutter_feature_init:
* must be called with the static lock on __features held, to keep it
* mt-safe.
*
* XXX - here we need a bit of weird machinery in place. the features
* are checked at run time, each time we try to access them - unless
* we already checked them once. unfortunately, we need an open
* X display if we want to check them, so ideally we'd need to call
* clutter_init() before checking for any feature. the generator for
* the api documentation, and more in general every tool relying on the
* introspection API provided by GObject, may well not be able to call
* clutter_init() (and neither they should be, as we might be running
* them on a headless build box). so, we need a way to get the features
* without explicitely calling clutter_feature_init() inside clutter_init()
* and we also need to have an open X display when we test for the features.
* __features is dynamically allocated, and applications tend to badly
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* crash when trying to access __features components if we did not allocate
* it; so when can't use a NULL check to know whether we already invoked
* clutter_feature_init() once; hence, we must allocate it anyway, and have
* a flag to let us know when the features have been set - that is when
* clutter_feature_init() has been successfully completed with an open
* X display.
*/
static void
clutter_feature_init (void)
{
const gchar *gl_extensions, *glx_extensions;
CLUTTER_NOTE (MISC, "checking features");
if (!__features)
{
CLUTTER_NOTE (MISC, "allocating features data");
__features = g_new0 (ClutterFeatures, 1);
memset(&__features->funcs, 0, sizeof(ClutterFeatureFuncs));
__features->features_set = FALSE; /* don't rely on zero-ing */
}
if (!clutter_glx_display ())
return;
if (__features->features_set)
return;
gl_extensions = (const gchar*) glGetString (GL_EXTENSIONS);
glx_extensions = glXQueryExtensionsString (clutter_glx_display (),
clutter_glx_screen ());
if (check_gl_extension ("GL_ARB_texture_rectangle", gl_extensions)
|| check_gl_extension ("GL_EXT_texture_rectangle", gl_extensions))
__features->flags |= CLUTTER_FEATURE_TEXTURE_RECTANGLE;
/* vblank */
__features->vblank_type = CLUTTER_VBLANK_NONE;
if (getenv("__GL_SYNC_TO_VBLANK") || check_vblank_env("none"))
{
CLUTTER_NOTE (MISC, "vblank sync: disabled at user request");
}
else
{
if (!check_vblank_env("dri") &&
check_gl_extension ("GLX_SGI_video_sync", glx_extensions))
{
__features->funcs.get_video_sync =
(GLXGetVideoSyncProc) get_proc_address ("glXGetVideoSyncSGI");
__features->funcs.wait_video_sync =
(GLXWaitVideoSyncProc) get_proc_address ("glXWaitVideoSyncSGI");
if ((__features->funcs.get_video_sync != NULL) &&
(__features->funcs.wait_video_sync != NULL))
{
CLUTTER_NOTE (MISC, "vblank sync: using glx");
2006-11-21 Emmanuele Bassi <ebassi@openedhand.com> * configure.ac: Enable debug messages also when --enable-debug is set to "minimum". * clutter/Makefile.am: * clutter/clutter-debug.h: Move all debugging macros inside this private header; make all debug macros depend on the CLUTTER_ENABLE_DEBUG compile time define, controlled by the --enable-debug configure switch; add G_LOG_DOMAIN define. * clutter/clutter-main.c: Clean up the debug stuff; add command line argument parsing using GOption; the debug messages now are triggered like this: CLUTTER_DEBUG=section:section:... clutter-app or like this: clutter-app --clutter-debug=section:section:... where "section" is one of the sections listed in clutter-main.c, or "all", for all sections; each section is bound to a flag, which can be used to define a domain when adding a debug note using the CLUTTER_NOTE() macro; the old CLUTTER_DBG() macro is just a wrapper around that, under the CLUTTER_DEBUG_MISC domain; CLUTTER_NOTE() is used like this: CLUTTER_NOTE (DOMAIN, log-function); where log function is g_printerr(), g_message(), g_warning(), g_critical() or directly g_log() - for instance: CLUTTER_NOTE (PANGO, g_warning ("Cache miss: %d", glyph)); will print the warning only if the "pango" flag has been set to the CLUTTER_DEBUG envvar or passed to the --clutter-debug command line argument. similar to CLUTTER_SHOW_FPS, there's also the --clutter-show-fps command line switch; also, the --display and --screen command line switches have been added: the first overrides the DISPLAY envvar and the second controls the X screen used by Clutter to get the root window on the display. * clutter/clutter-main.h: * clutter/clutter-main.c: Add extended support for GOption in Clutter; use clutter_init_with_args() to let Clutter parse your own command line arguments; use instead clutter_get_option_group() to get the GOptionGroup used by Clutter if you want to do the parsing yourself with g_option_context_parse(). The init sequence has been verified, updated and moved into common functions where possible. * clutter/pango/pangoclutter-render.c: * clutter/*.c: Include "clutter-debug.h" where needed; use CLUTTER_NOTE() instead of CLUTTER_DBG(). * examples/super-oh.c: Use the new clutter_init_with_args() function, and add a --num-hands command line switch to the SuperOH example code controlling the number of hands at runtime.
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__features->vblank_type = CLUTTER_VBLANK_GLX;
__features->flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
}
if (!(__features->flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
{
__features->dri_fd = open("/dev/dri/card0", O_RDWR);
if (__features->dri_fd >= 0)
{
CLUTTER_NOTE (MISC, "vblank sync: using dri");
2006-11-21 Emmanuele Bassi <ebassi@openedhand.com> * configure.ac: Enable debug messages also when --enable-debug is set to "minimum". * clutter/Makefile.am: * clutter/clutter-debug.h: Move all debugging macros inside this private header; make all debug macros depend on the CLUTTER_ENABLE_DEBUG compile time define, controlled by the --enable-debug configure switch; add G_LOG_DOMAIN define. * clutter/clutter-main.c: Clean up the debug stuff; add command line argument parsing using GOption; the debug messages now are triggered like this: CLUTTER_DEBUG=section:section:... clutter-app or like this: clutter-app --clutter-debug=section:section:... where "section" is one of the sections listed in clutter-main.c, or "all", for all sections; each section is bound to a flag, which can be used to define a domain when adding a debug note using the CLUTTER_NOTE() macro; the old CLUTTER_DBG() macro is just a wrapper around that, under the CLUTTER_DEBUG_MISC domain; CLUTTER_NOTE() is used like this: CLUTTER_NOTE (DOMAIN, log-function); where log function is g_printerr(), g_message(), g_warning(), g_critical() or directly g_log() - for instance: CLUTTER_NOTE (PANGO, g_warning ("Cache miss: %d", glyph)); will print the warning only if the "pango" flag has been set to the CLUTTER_DEBUG envvar or passed to the --clutter-debug command line argument. similar to CLUTTER_SHOW_FPS, there's also the --clutter-show-fps command line switch; also, the --display and --screen command line switches have been added: the first overrides the DISPLAY envvar and the second controls the X screen used by Clutter to get the root window on the display. * clutter/clutter-main.h: * clutter/clutter-main.c: Add extended support for GOption in Clutter; use clutter_init_with_args() to let Clutter parse your own command line arguments; use instead clutter_get_option_group() to get the GOptionGroup used by Clutter if you want to do the parsing yourself with g_option_context_parse(). The init sequence has been verified, updated and moved into common functions where possible. * clutter/pango/pangoclutter-render.c: * clutter/*.c: Include "clutter-debug.h" where needed; use CLUTTER_NOTE() instead of CLUTTER_DBG(). * examples/super-oh.c: Use the new clutter_init_with_args() function, and add a --num-hands command line switch to the SuperOH example code controlling the number of hands at runtime.
2006-11-21 16:27:53 -05:00
__features->vblank_type = CLUTTER_VBLANK_DRI;
__features->flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
}
if (!(__features->flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
2006-11-21 Emmanuele Bassi <ebassi@openedhand.com> * configure.ac: Enable debug messages also when --enable-debug is set to "minimum". * clutter/Makefile.am: * clutter/clutter-debug.h: Move all debugging macros inside this private header; make all debug macros depend on the CLUTTER_ENABLE_DEBUG compile time define, controlled by the --enable-debug configure switch; add G_LOG_DOMAIN define. * clutter/clutter-main.c: Clean up the debug stuff; add command line argument parsing using GOption; the debug messages now are triggered like this: CLUTTER_DEBUG=section:section:... clutter-app or like this: clutter-app --clutter-debug=section:section:... where "section" is one of the sections listed in clutter-main.c, or "all", for all sections; each section is bound to a flag, which can be used to define a domain when adding a debug note using the CLUTTER_NOTE() macro; the old CLUTTER_DBG() macro is just a wrapper around that, under the CLUTTER_DEBUG_MISC domain; CLUTTER_NOTE() is used like this: CLUTTER_NOTE (DOMAIN, log-function); where log function is g_printerr(), g_message(), g_warning(), g_critical() or directly g_log() - for instance: CLUTTER_NOTE (PANGO, g_warning ("Cache miss: %d", glyph)); will print the warning only if the "pango" flag has been set to the CLUTTER_DEBUG envvar or passed to the --clutter-debug command line argument. similar to CLUTTER_SHOW_FPS, there's also the --clutter-show-fps command line switch; also, the --display and --screen command line switches have been added: the first overrides the DISPLAY envvar and the second controls the X screen used by Clutter to get the root window on the display. * clutter/clutter-main.h: * clutter/clutter-main.c: Add extended support for GOption in Clutter; use clutter_init_with_args() to let Clutter parse your own command line arguments; use instead clutter_get_option_group() to get the GOptionGroup used by Clutter if you want to do the parsing yourself with g_option_context_parse(). The init sequence has been verified, updated and moved into common functions where possible. * clutter/pango/pangoclutter-render.c: * clutter/*.c: Include "clutter-debug.h" where needed; use CLUTTER_NOTE() instead of CLUTTER_DBG(). * examples/super-oh.c: Use the new clutter_init_with_args() function, and add a --num-hands command line switch to the SuperOH example code controlling the number of hands at runtime.
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{
CLUTTER_NOTE (MISC,
"vblank sync: no use-able mechanism found");
2006-11-21 Emmanuele Bassi <ebassi@openedhand.com> * configure.ac: Enable debug messages also when --enable-debug is set to "minimum". * clutter/Makefile.am: * clutter/clutter-debug.h: Move all debugging macros inside this private header; make all debug macros depend on the CLUTTER_ENABLE_DEBUG compile time define, controlled by the --enable-debug configure switch; add G_LOG_DOMAIN define. * clutter/clutter-main.c: Clean up the debug stuff; add command line argument parsing using GOption; the debug messages now are triggered like this: CLUTTER_DEBUG=section:section:... clutter-app or like this: clutter-app --clutter-debug=section:section:... where "section" is one of the sections listed in clutter-main.c, or "all", for all sections; each section is bound to a flag, which can be used to define a domain when adding a debug note using the CLUTTER_NOTE() macro; the old CLUTTER_DBG() macro is just a wrapper around that, under the CLUTTER_DEBUG_MISC domain; CLUTTER_NOTE() is used like this: CLUTTER_NOTE (DOMAIN, log-function); where log function is g_printerr(), g_message(), g_warning(), g_critical() or directly g_log() - for instance: CLUTTER_NOTE (PANGO, g_warning ("Cache miss: %d", glyph)); will print the warning only if the "pango" flag has been set to the CLUTTER_DEBUG envvar or passed to the --clutter-debug command line argument. similar to CLUTTER_SHOW_FPS, there's also the --clutter-show-fps command line switch; also, the --display and --screen command line switches have been added: the first overrides the DISPLAY envvar and the second controls the X screen used by Clutter to get the root window on the display. * clutter/clutter-main.h: * clutter/clutter-main.c: Add extended support for GOption in Clutter; use clutter_init_with_args() to let Clutter parse your own command line arguments; use instead clutter_get_option_group() to get the GOptionGroup used by Clutter if you want to do the parsing yourself with g_option_context_parse(). The init sequence has been verified, updated and moved into common functions where possible. * clutter/pango/pangoclutter-render.c: * clutter/*.c: Include "clutter-debug.h" where needed; use CLUTTER_NOTE() instead of CLUTTER_DBG(). * examples/super-oh.c: Use the new clutter_init_with_args() function, and add a --num-hands command line switch to the SuperOH example code controlling the number of hands at runtime.
2006-11-21 16:27:53 -05:00
}
}
CLUTTER_NOTE (MISC, "features checked");
__features->features_set = TRUE;
}
static inline void
clutter_feature_do_init (void)
{
if (G_UNLIKELY (__features == NULL) ||
G_UNLIKELY (__features->features_set == FALSE))
{
G_LOCK (__features);
clutter_feature_init ();
G_UNLOCK (__features);
}
}
/**
* clutter_feature_available:
* @feature: a #ClutterFeatureFlags
*
* Checks whether @feature is available. @feature can be a logical
* OR of #ClutterFeatureFlags.
*
* Return value: %TRUE if a feature is available
*
* Since: 0.1.1
*/
gboolean
clutter_feature_available (ClutterFeatureFlags feature)
{
clutter_feature_do_init ();
return (__features->flags & feature);
}
/**
2006-11-15 Emmanuele Bassi <ebassi@openedhand.com> * clutter/clutter-alpha.h: * clutter/clutter-alpha.c: Add a data parameter to the ClutterAlphaFunc; add a data+destroy parameter to clutter_alpha_set_func() and to clutter_alpha_new(), and turned the latter into clutter_alpha_new_full(); add a simple, empty constructor clutter_alpha_new(). These changes makes writing bindings a tad more easy, as bindings require passing their own functions in order to call the real alpha function. * clutter/clutter-behaviour.h: Clean up the header. * clutter/clutter-behaviours.[ch]: * clutter/clutter-behaviour-opacity.[ch]: * clutter/clutter-behaviour-path.[ch]: * clutter/clutter-behaviour-scale.[ch]: Split the ClutterBehaviourPath, ClutterBehaviourOpacity and ClutterBehaviourScale into their own files as they have been growing a bit. Fix ClutterBehaviourPath API. * clutter/clutter-media.h: Remove the commented "metadata_available" signal: gtk-doc chokes up on that. * clutter/clutter-timeline.h: * clutter/clutter-timeline.c: Remove the useless ClutterTimelineAlphaFunc signature; add missing accessor methods for the properties; clean up a bit. * clutter/clutter-util.h: * clutter/clutter-util.c: Remove unneeded function clutter_util_can_create_texture(). * clutter/clutter-feature.h: Sync the name of clutter_feature_get_all() with the name declared in clutter-feature.h. * clutter/Makefile.am: * clutter/clutter.h: Update. * examples/behave.c: Update to the new ClutterAlpha constructor. * examples/super-oh.c: Use the right pointer and avoid the compiler making a fuss about it.
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* clutter_feature_get_all:
*
* Returns all the supported features.
*
* Return value: a logical OR of all the supported features.
*
* Since: 0.1.1
*/
ClutterFeatureFlags
2006-11-15 Emmanuele Bassi <ebassi@openedhand.com> * clutter/clutter-alpha.h: * clutter/clutter-alpha.c: Add a data parameter to the ClutterAlphaFunc; add a data+destroy parameter to clutter_alpha_set_func() and to clutter_alpha_new(), and turned the latter into clutter_alpha_new_full(); add a simple, empty constructor clutter_alpha_new(). These changes makes writing bindings a tad more easy, as bindings require passing their own functions in order to call the real alpha function. * clutter/clutter-behaviour.h: Clean up the header. * clutter/clutter-behaviours.[ch]: * clutter/clutter-behaviour-opacity.[ch]: * clutter/clutter-behaviour-path.[ch]: * clutter/clutter-behaviour-scale.[ch]: Split the ClutterBehaviourPath, ClutterBehaviourOpacity and ClutterBehaviourScale into their own files as they have been growing a bit. Fix ClutterBehaviourPath API. * clutter/clutter-media.h: Remove the commented "metadata_available" signal: gtk-doc chokes up on that. * clutter/clutter-timeline.h: * clutter/clutter-timeline.c: Remove the useless ClutterTimelineAlphaFunc signature; add missing accessor methods for the properties; clean up a bit. * clutter/clutter-util.h: * clutter/clutter-util.c: Remove unneeded function clutter_util_can_create_texture(). * clutter/clutter-feature.h: Sync the name of clutter_feature_get_all() with the name declared in clutter-feature.h. * clutter/Makefile.am: * clutter/clutter.h: Update. * examples/behave.c: Update to the new ClutterAlpha constructor. * examples/super-oh.c: Use the right pointer and avoid the compiler making a fuss about it.
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clutter_feature_get_all (void)
{
clutter_feature_do_init ();
return __features->flags;
}
/**
* clutter_feature_wait_for_vblank:
*
* FIXME
*
* Since: 0.2
*/
void
clutter_feature_wait_for_vblank (void)
{
clutter_feature_do_init ();
switch (__features->vblank_type)
{
case CLUTTER_VBLANK_GLX:
{
unsigned int retraceCount;
__features->funcs.get_video_sync (&retraceCount);
__features->funcs.wait_video_sync (2,
(retraceCount + 1) % 2,
&retraceCount);
}
break;
case CLUTTER_VBLANK_DRI:
{
drm_wait_vblank_t blank;
blank.request.type = DRM_VBLANK_RELATIVE;
blank.request.sequence = 1;
blank.request.signal = 0;
drm_wait_vblank (__features->dri_fd, &blank);
}
break;
case CLUTTER_VBLANK_NONE:
default:
break;
}
}