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mutter/clutter/glx/clutter-backend-glx.c
Robert Bragg 0057755854 profiling: Adds initial UProf support across clutter 
UProf is a small library that aims to help applications/libraries provide
domain specific reports about performance.  It currently provides high
precision timer primitives (rdtsc on x86) and simple counters, the ability
to link statistics between optional components at runtime and makes report
generation easy.

This adds initial accounting for:
- Total mainloop time
- Painting
- Picking
- Layouting
- Idle time

The timing done by uprof is of wall clock time. It's not based on stochastic
samples we simply sample a counter at the start and end.  When dealing with
the complexities of GPU drivers and with various kinds of IO this form of
profiling can be quite enlightening as it will be able to represent where
your application is blocking unlike tools such as sysprof.

To enable uprof accounting you must configure Clutter with --enable-profile
and have uprof-0.2 installed from git://git.moblin.org/uprof

If you want to see a report of statistics when Clutter applications exit you
should export CLUTTER_PROFILE_OUTPUT_REPORT=1 before running them.

Just a final word of caution; this stuff is new and the manual nature of
adding uprof instrumentation means it is prone to some errors when modifying
code.  This just means that when you question strange results don't rule out
a mistake in the instrumentation.  Obviously though we hope the benfits out
weigh e.g.  by focusing on very key stats and by having automatic reporting.
2010-01-08 20:19:49 +00:00

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/* 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 <glib/gi18n-lib.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <GL/glx.h>
#include <GL/gl.h>
#include "clutter-backend-glx.h"
#include "clutter-stage-glx.h"
#include "clutter-glx.h"
#include "clutter-profile.h"
#include "../clutter-event.h"
#include "../clutter-main.h"
#include "../clutter-debug.h"
#include "../clutter-private.h"
#include "../clutter-version.h"
#include "cogl/cogl.h"
G_DEFINE_TYPE (ClutterBackendGLX, clutter_backend_glx, CLUTTER_TYPE_BACKEND_X11);
/* singleton object */
static ClutterBackendGLX *backend_singleton = NULL;
static gchar *clutter_vblank_name = NULL;
#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
G_CONST_RETURN gchar*
clutter_backend_glx_get_vblank_method (void)
{
return clutter_vblank_name;
}
static gboolean
clutter_backend_glx_pre_parse (ClutterBackend *backend,
GError **error)
{
const gchar *env_string;
env_string = g_getenv ("CLUTTER_VBLANK");
if (env_string)
{
clutter_vblank_name = g_strdup (env_string);
env_string = NULL;
}
return clutter_backend_x11_pre_parse (backend, error);
}
static gboolean
clutter_backend_glx_post_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
int glx_major, glx_minor;
if (clutter_backend_x11_post_parse (backend, error))
{
if (!glXQueryVersion (backend_x11->xdpy, &glx_major, &glx_minor)
|| !(glx_major > 1 || glx_minor > 1))
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"XServer appears to lack required GLX support");
return FALSE;
}
}
else
return FALSE;
return TRUE;
}
static const GOptionEntry entries[] =
{
{ "vblank", 0,
0,
G_OPTION_ARG_STRING, &clutter_vblank_name,
N_("VBlank method to be used (none, dri or glx)"), "METHOD"
},
{ NULL }
};
static void
clutter_backend_glx_add_options (ClutterBackend *backend,
GOptionGroup *group)
{
g_option_group_add_entries (group, entries);
clutter_backend_x11_add_options (backend, group);
}
static void
clutter_backend_glx_finalize (GObject *gobject)
{
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);
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject);
/* Unrealize all shaders, since the GL context is going away */
_clutter_shader_release_all ();
if (backend_glx->gl_context)
{
glXDestroyContext (backend_x11->xdpy, backend_glx->gl_context);
backend_glx->gl_context = None;
}
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 gboolean
check_vblank_env (const char *name)
{
if (clutter_vblank_name && !g_ascii_strcasecmp (clutter_vblank_name, name))
return TRUE;
return FALSE;
}
static ClutterFeatureFlags
clutter_backend_glx_get_features (ClutterBackend *backend)
{
ClutterBackendGLX *backend_glx = CLUTTER_BACKEND_GLX (backend);
const gchar *glx_extensions = NULL;
ClutterFeatureFlags flags;
flags = clutter_backend_x11_get_features (backend);
flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
/* this will make sure that the GL context exists and
* it's bound to a drawable
*/
g_assert (backend_glx->gl_context != None);
g_assert (glXGetCurrentDrawable () != None);
CLUTTER_NOTE (BACKEND, "Checking features\n"
"GL_VENDOR: %s\n"
"GL_RENDERER: %s\n"
"GL_VERSION: %s\n"
"GL_EXTENSIONS: %s\n",
glGetString (GL_VENDOR),
glGetString (GL_RENDERER),
glGetString (GL_VERSION),
glGetString (GL_EXTENSIONS));
glx_extensions =
glXQueryExtensionsString (clutter_x11_get_default_display (),
clutter_x11_get_default_screen ());
CLUTTER_NOTE (BACKEND, "GLX Extensions: %s", glx_extensions);
/* First check for explicit disabling or it set elsewhere (eg NVIDIA) */
if (getenv("__GL_SYNC_TO_VBLANK") || check_vblank_env ("none"))
{
CLUTTER_NOTE (BACKEND, "vblank sync: disabled at user request");
}
else
{
/* We try two GL vblank syncing mechanisms.
* glXSwapIntervalSGI is tried first, then glXGetVideoSyncSGI.
*
* glXSwapIntervalSGI is known to work with Mesa and in particular
* the Intel drivers. glXGetVideoSyncSGI has serious problems with
* Intel drivers causing terrible frame rate so it only tried as a
* fallback.
*
* How well glXGetVideoSyncSGI works with other driver (ATI etc) needs
* to be investigated. glXGetVideoSyncSGI on ATI at least seems to have
* no effect.
*/
if (!check_vblank_env ("dri") &&
cogl_check_extension ("GLX_SGI_swap_control", glx_extensions))
{
backend_glx->swap_interval =
(SwapIntervalProc) cogl_get_proc_address ("glXSwapIntervalSGI");
CLUTTER_NOTE (BACKEND, "attempting glXSwapIntervalSGI vblank setup");
if (backend_glx->swap_interval != NULL)
{
if (backend_glx->swap_interval (1) == 0)
{
backend_glx->vblank_type = CLUTTER_VBLANK_GLX_SWAP;
flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
CLUTTER_NOTE (BACKEND, "glXSwapIntervalSGI setup success");
}
}
if (!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
CLUTTER_NOTE (BACKEND, "glXSwapIntervalSGI vblank setup failed");
}
if (!check_vblank_env ("dri") &&
!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK) &&
cogl_check_extension ("GLX_SGI_video_sync", glx_extensions))
{
CLUTTER_NOTE (BACKEND, "attempting glXGetVideoSyncSGI vblank setup");
backend_glx->get_video_sync =
(GetVideoSyncProc) cogl_get_proc_address ("glXGetVideoSyncSGI");
backend_glx->wait_video_sync =
(WaitVideoSyncProc) cogl_get_proc_address ("glXWaitVideoSyncSGI");
if ((backend_glx->get_video_sync != NULL) &&
(backend_glx->wait_video_sync != NULL))
{
CLUTTER_NOTE (BACKEND,
"glXGetVideoSyncSGI vblank setup success");
backend_glx->vblank_type = CLUTTER_VBLANK_GLX;
flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
if (!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
CLUTTER_NOTE (BACKEND, "glXGetVideoSyncSGI vblank setup failed");
}
#ifdef __linux__
/*
* DRI is really an extreme fallback -rumoured to work with Via chipsets
*/
if (!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
{
CLUTTER_NOTE (BACKEND, "attempting DRI vblank setup");
backend_glx->dri_fd = open("/dev/dri/card0", O_RDWR);
if (backend_glx->dri_fd >= 0)
{
CLUTTER_NOTE (BACKEND, "DRI vblank setup success");
backend_glx->vblank_type = CLUTTER_VBLANK_DRI;
flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
if (!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
CLUTTER_NOTE (BACKEND, "DRI vblank setup failed");
}
#endif
if (!(flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
{
CLUTTER_NOTE (BACKEND,
"no use-able vblank mechanism found");
}
}
CLUTTER_NOTE (MISC, "backend features checked");
return flags;
}
/* It seems the GLX spec never defined an invalid GLXFBConfig that
* we could overload as an indication of error, so we have to return
* an explicit boolean status. */
gboolean
_clutter_backend_glx_get_fbconfig (ClutterBackendGLX *backend_glx,
GLXFBConfig *config)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend_glx);
GLXFBConfig *configs = NULL;
gboolean use_argb = clutter_x11_get_use_argb_visual ();
int n_configs, i;
static const int attributes[] = {
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DOUBLEBUFFER, GL_TRUE,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_ALPHA_SIZE, 1,
GLX_DEPTH_SIZE, 1,
GLX_STENCIL_SIZE, 1,
None
};
if (backend_x11->xdpy == None || backend_x11->xscreen == None)
return FALSE;
/* If we don't already have a cached config then try to get one */
if (!backend_glx->found_fbconfig)
{
CLUTTER_NOTE (BACKEND,
"Retrieving GL fbconfig, dpy: %p, xscreen; %p (%d)",
backend_x11->xdpy,
backend_x11->xscreen,
backend_x11->xscreen_num);
configs = glXChooseFBConfig (backend_x11->xdpy,
backend_x11->xscreen_num,
attributes,
&n_configs);
if (configs)
{
if (use_argb)
{
for (i = 0; i < n_configs; i++)
{
XVisualInfo *vinfo;
vinfo = glXGetVisualFromFBConfig (backend_x11->xdpy,
configs[i]);
if (vinfo == None)
continue;
if (vinfo->depth == 32 &&
(vinfo->red_mask == 0xff0000 &&
vinfo->green_mask == 0x00ff00 &&
vinfo->blue_mask == 0x0000ff))
{
CLUTTER_NOTE (BACKEND,
"Found GLX visual ARGB [index:%d]", i);
backend_glx->found_fbconfig = TRUE;
backend_glx->fbconfig = configs[i];
goto out;
}
}
/* If we make it here then we didn't find an RGBA config so
we'll fall back to using an RGB config */
CLUTTER_NOTE (BACKEND, "ARGB visual requested, but none found");
}
if (n_configs >= 1)
{
backend_glx->found_fbconfig = TRUE;
backend_glx->fbconfig = configs[0];
}
out:
XFree (configs);
}
}
if (backend_glx->found_fbconfig)
{
*config = backend_glx->fbconfig;
return TRUE;
}
else
return FALSE;
}
static XVisualInfo *
clutter_backend_glx_get_visual_info (ClutterBackendX11 *backend_x11)
{
ClutterBackendGLX *backend_glx = CLUTTER_BACKEND_GLX (backend_x11);
GLXFBConfig config;
if (!_clutter_backend_glx_get_fbconfig (backend_glx, &config))
return NULL;
return glXGetVisualFromFBConfig (backend_x11->xdpy, config);
}
static gboolean
clutter_backend_glx_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendGLX *backend_glx = CLUTTER_BACKEND_GLX (backend);
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
if (backend_glx->gl_context == None)
{
GLXFBConfig config;
gboolean is_direct;
if (!_clutter_backend_glx_get_fbconfig (backend_glx, &config))
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to find a suitable GLXFBConfig for "
"the GLX context");
return FALSE;
}
CLUTTER_NOTE (GL, "Creating GLX Context (display: %p)",
backend_x11->xdpy);
backend_glx->gl_context =
glXCreateNewContext (backend_x11->xdpy,
config,
GLX_RGBA_TYPE,
NULL,
True);
if (backend_glx->gl_context == None)
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Unable to create suitable GL context");
return FALSE;
}
is_direct = glXIsDirect (backend_x11->xdpy,
backend_glx->gl_context);
CLUTTER_NOTE (GL,
"Setting %s context",
is_direct ? "direct" : "indirect");
_cogl_set_indirect_context (!is_direct);
}
return TRUE;
}
static void
clutter_backend_glx_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterStageWindow *impl;
/* if there is no stage, the stage is being destroyed or it has no
* implementation attached to it then we clear the GL context
*/
if (stage == NULL ||
(CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_IN_DESTRUCTION) ||
((impl = _clutter_stage_get_window (stage)) == NULL))
{
ClutterBackendX11 *backend_x11;
backend_x11 = CLUTTER_BACKEND_X11 (backend);
CLUTTER_NOTE (MULTISTAGE, "Clearing all context");
glXMakeContextCurrent (backend_x11->xdpy, None, None, NULL);
}
else
{
ClutterBackendGLX *backend_glx;
ClutterBackendX11 *backend_x11;
ClutterStageGLX *stage_glx;
ClutterStageX11 *stage_x11;
g_assert (impl != NULL);
CLUTTER_NOTE (MULTISTAGE, "Setting context for stage of type %s [%p]",
g_type_name (G_OBJECT_TYPE (impl)),
impl);
stage_glx = CLUTTER_STAGE_GLX (impl);
stage_x11 = CLUTTER_STAGE_X11 (impl);
backend_glx = CLUTTER_BACKEND_GLX (backend);
backend_x11 = CLUTTER_BACKEND_X11 (backend);
/* no GL context to set */
if (backend_glx->gl_context == None)
return;
clutter_x11_trap_x_errors ();
/* we might get here inside the final dispose cycle, so we
* need to handle this gracefully
*/
if (stage_x11->xwin == None)
{
CLUTTER_NOTE (MULTISTAGE,
"Received a stale stage, clearing all context");
glXMakeContextCurrent (backend_x11->xdpy, None, None, NULL);
}
else
{
CLUTTER_NOTE (BACKEND,
"MakeContextCurrent dpy: %p, window: 0x%x (%s), context: %p",
backend_x11->xdpy,
(int) stage_x11->xwin,
stage_x11->is_foreign_xwin ? "foreign" : "native",
backend_glx->gl_context);
glXMakeContextCurrent (backend_x11->xdpy,
stage_x11->xwin,
stage_x11->xwin,
backend_glx->gl_context);
}
if (clutter_x11_untrap_x_errors ())
g_critical ("Unable to make the stage window 0x%x the current "
"GLX drawable",
(int) stage_x11->xwin);
}
}
static void
glx_wait_for_vblank (ClutterBackendGLX *backend_glx)
{
/* If we are going to wait for VBLANK manually, we not only need
* to flush out pending drawing to the GPU before we sleep, we
* need to wait for it to finish. Otherwise, we may end up with
* the situation:
*
* - We finish drawing - GPU drawing continues
* - We go to sleep - GPU drawing continues
* VBLANK - We call glXSwapBuffers - GPU drawing continues
* - GPU drawing continues
* - Swap buffers happens
*
* Producing a tear. Calling glFinish() first will cause us to properly
* wait for the next VBLANK before we swap. This obviously does not
* happen when we use GLX_SWAP and let the driver do the right thing
*/
switch (backend_glx->vblank_type)
{
case CLUTTER_VBLANK_GLX_SWAP:
/* Nothing */
break;
case CLUTTER_VBLANK_GLX:
{
unsigned int retraceCount;
glFinish ();
backend_glx->get_video_sync (&retraceCount);
backend_glx->wait_video_sync (2,
(retraceCount + 1) % 2,
&retraceCount);
}
break;
case CLUTTER_VBLANK_DRI:
#ifdef __linux__
{
drm_wait_vblank_t blank;
glFinish ();
blank.request.type = DRM_VBLANK_RELATIVE;
blank.request.sequence = 1;
blank.request.signal = 0;
drm_wait_vblank (backend_glx->dri_fd, &blank);
}
#endif
break;
case CLUTTER_VBLANK_NONE:
default:
break;
}
}
static void
clutter_backend_glx_redraw (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterBackendX11 *backend_x11;
ClutterStageGLX *stage_glx;
ClutterStageX11 *stage_x11;
ClutterStageWindow *impl;
CLUTTER_STATIC_TIMER (painting_timer,
"Redrawing", /* parent */
"Painting actors",
"The time spent painting actors",
0 /* no application private data */);
CLUTTER_STATIC_TIMER (swapbuffers_timer,
"Redrawing", /* parent */
"glXSwapBuffers",
"The time spent blocked by glXSwapBuffers",
0 /* no application private data */);
impl = _clutter_stage_get_window (stage);
if (G_UNLIKELY (impl == NULL))
{
CLUTTER_NOTE (BACKEND, "Stage [%p] has no implementation", stage);
return;
}
g_assert (CLUTTER_IS_STAGE_GLX (impl));
backend_x11 = CLUTTER_BACKEND_X11 (backend);
stage_x11 = CLUTTER_STAGE_X11 (impl);
stage_glx = CLUTTER_STAGE_GLX (impl);
CLUTTER_TIMER_START (_clutter_uprof_context, painting_timer);
/* this will cause the stage implementation to be painted */
clutter_actor_paint (CLUTTER_ACTOR (stage));
cogl_flush ();
CLUTTER_TIMER_STOP (_clutter_uprof_context, painting_timer);
if (stage_x11->xwin != None)
{
/* wait for the next vblank */
CLUTTER_NOTE (BACKEND, "Waiting for vblank");
glx_wait_for_vblank (CLUTTER_BACKEND_GLX (backend));
/* push on the screen */
CLUTTER_NOTE (BACKEND, "glXSwapBuffers (display: %p, window: 0x%lx)",
backend_x11->xdpy,
(unsigned long) stage_x11->xwin);
CLUTTER_TIMER_START (_clutter_uprof_context, swapbuffers_timer);
glXSwapBuffers (backend_x11->xdpy, stage_x11->xwin);
CLUTTER_TIMER_STOP (_clutter_uprof_context, swapbuffers_timer);
}
}
static ClutterStageWindow *
clutter_backend_glx_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
ClutterStageWindow *stage_window;
ClutterStageX11 *stage_x11;
CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
g_type_name (CLUTTER_STAGE_TYPE));
stage_window = g_object_new (CLUTTER_TYPE_STAGE_GLX, NULL);
/* copy backend data into the stage */
stage_x11 = CLUTTER_STAGE_X11 (stage_window);
stage_x11->wrapper = wrapper;
CLUTTER_NOTE (BACKEND,
"GLX stage created[%p] (dpy:%p, screen:%d, root:%u, wrap:%p)",
stage_window,
backend_x11->xdpy,
backend_x11->xscreen_num,
(unsigned int) backend_x11->xwin_root,
wrapper);
return stage_window;
}
static void
clutter_backend_glx_class_init (ClutterBackendGLXClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
ClutterBackendX11Class *backendx11_class = CLUTTER_BACKEND_X11_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->create_stage = clutter_backend_glx_create_stage;
backend_class->add_options = clutter_backend_glx_add_options;
backend_class->get_features = clutter_backend_glx_get_features;
backend_class->redraw = clutter_backend_glx_redraw;
backend_class->create_context = clutter_backend_glx_create_context;
backend_class->ensure_context = clutter_backend_glx_ensure_context;
backendx11_class->get_visual_info = clutter_backend_glx_get_visual_info;
}
static void
clutter_backend_glx_init (ClutterBackendGLX *backend_glx)
{
}
/* every backend must implement this function */
GType
_clutter_backend_impl_get_type (void)
{
return clutter_backend_glx_get_type ();
}
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