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2006-12-04 Emmanuele Bassi <ebassi@openedhand.com>

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Avoid clutter segfaulting when used without invoking
	clutter_init().  This is needed when using api documentation
	tools and every other tool relying on the GObject
	introspection API (esp. on a headless box).  see the
	note in clutter/clutter-feature.c:clutter_feature_init
	for a full explanation.

	* clutter/clutter-feature.c: Call clutter_feature_init()
	when needed by one of the accessors of the features
	structure.

	* clutter/clutter-main.c:
	* clutter/clutter-private.h: Remove clutter_feature_init()
	public declaration: the features support check is done the
	first time a feature is needed.

	* clutter/clutter-main.c: Do not ever access the clutter
	main context pointer directly; instead, obtain a pointer
	to it via clutter_context_get_default(), which will always
	return something valid.
This commit is contained in:
Emmanuele Bassi
2006-12-04 19:19:53 +00:00
parent f83ffa3520
commit 6d87b1479c
6 changed files with 136 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

112
clutter/clutter-feature.c
View File

@ -76,9 +76,11 @@ typedef struct ClutterFeatures
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;
@ -125,10 +127,11 @@ static int drm_wait_vblank(int fd, drm_wait_vblank_t *vbl)
/* Note must be called after context created */
static gboolean
check_gl_extension (const gchar *name, const gchar *ext)
check_gl_extension (const gchar *name,
const gchar *ext)
{
gchar *end;
gint name_len, n;
gchar *end;
gint name_len, n;
if (name == NULL || ext == NULL)
return FALSE;
@ -162,22 +165,27 @@ get_proc_address (const gchar *name)
if (dlhand)
{
dlerror ();
get_proc_func
= (GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddress");
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddress");
if (dlerror () != NULL)
get_proc_func
= (GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddressARB");
{
get_proc_func =
(GLXGetProcAddressProc) dlsym (dlhand, "glXGetProcAddressARB");
}
if (dlerror () != NULL)
{
get_proc_func = NULL;
g_warning
("failed to bind GLXGetProcAddress or GLXGetProcAddressARB");
g_warning ("failed to bind GLXGetProcAddress "
"or GLXGetProcAddressARB");
}
}
}
if (get_proc_func)
return get_proc_func ((unsigned char*)name);
return get_proc_func ((unsigned char*) name);
return NULL;
}
@ -196,25 +204,54 @@ check_vblank_env (const char *name)
return FALSE;
}
void
/* 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
* crash when trying to access __features; 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 != NULL)
if (!__features)
{
g_warning ("You should never call clutter_feature_init() "
"more than once.");
return;
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 */
}
__features = g_new0 (ClutterFeatures, 1);
memset(&__features->funcs, 0, sizeof(ClutterFeatureFuncs));
if (!clutter_xdisplay ())
return;
gl_extensions = (const gchar*)glGetString(GL_EXTENSIONS);
glx_extensions = glXQueryExtensionsString (clutter_xdisplay(),
clutter_xscreen());
if (__features->features_set)
return;
gl_extensions = (const gchar*) glGetString (GL_EXTENSIONS);
glx_extensions = glXQueryExtensionsString (clutter_xdisplay (),
clutter_xscreen ());
if (check_gl_extension ("GL_ARB_texture_rectangle", gl_extensions))
__features->flags |= CLUTTER_FEATURE_TEXTURE_RECTANGLE;
@ -228,8 +265,8 @@ clutter_feature_init (void)
}
else
{
if (!check_vblank_env("dri")
&& check_gl_extension ("GLX_SGI_video_sync", glx_extensions))
if (!check_vblank_env("dri") &&
check_gl_extension ("GLX_SGI_video_sync", glx_extensions))
{
__features->funcs.get_video_sync =
(GLXGetVideoSyncProc) get_proc_address ("glXGetVideoSyncSGI");
@ -237,8 +274,8 @@ clutter_feature_init (void)
__features->funcs.wait_video_sync =
(GLXWaitVideoSyncProc) get_proc_address ("glXWaitVideoSyncSGI");
if (__features->funcs.get_video_sync != NULL
&& __features->funcs.wait_video_sync != NULL)
if ((__features->funcs.get_video_sync != NULL) &&
(__features->funcs.wait_video_sync != NULL))
{
CLUTTER_NOTE (MISC, "vblank sync: using glx");
@ -265,6 +302,18 @@ clutter_feature_init (void)
"vblank sync: no use-able mechanism found");
}
}
CLUTTER_NOTE (MISC, "features checked");
__features->features_set = TRUE;
}
static void
clutter_feature_do_init (void)
{
G_LOCK (__features);
clutter_feature_init ();
G_UNLOCK (__features);
}
/**
@ -281,13 +330,15 @@ clutter_feature_init (void)
gboolean
clutter_feature_available (ClutterFeatureFlags feature)
{
clutter_feature_do_init ();
return (__features->flags & feature);
}
/**
* clutter_feature_get_all:
*
* Returns all the suppoerted features.
* Returns all the supported features.
*
* Return value: a logical OR of all the supported features.
*
@ -296,6 +347,8 @@ clutter_feature_available (ClutterFeatureFlags feature)
ClutterFeatureFlags
clutter_feature_get_all (void)
{
clutter_feature_do_init ();
return __features->flags;
}
@ -309,14 +362,17 @@ clutter_feature_get_all (void)
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);
__features->funcs.get_video_sync (&retraceCount);
__features->funcs.wait_video_sync (2,
(retraceCount + 1) % 2,
&retraceCount);
}
break;
case CLUTTER_VBLANK_DRI: