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 "clutter-main.h"
#include "clutter-feature.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 <dlfcn.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;
} ClutterFeatures;
static ClutterFeatures* __features = 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 */
/* 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;
val = getenv("CLUTTER_VBLANK");
if (val && !strcasecmp(val, name))
return TRUE;
return FALSE;
}
void
clutter_feature_init (void)
{
const gchar *gl_extensions, *glx_extensions;
if (__features != NULL)
{
g_warning ("You should never call clutter_feature_init() "
"more than once.");
return;
}
__features = g_new0 (ClutterFeatures, 1);
memset(&__features->funcs, 0, sizeof(ClutterFeatureFuncs));
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;
/* vblank */
__features->vblank_type = CLUTTER_VBLANK_NONE;
if (getenv("__GL_SYNC_TO_VBLANK") || check_vblank_env("none"))
{
CLUTTER_DBG("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_DBG("vblank sync: using glx");
__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_DBG("vblank sync: using dri");
__features->vblank_type = CLUTTER_VBLANK_DRI;
__features->flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
}
if (!(__features->flags & CLUTTER_FEATURE_SYNC_TO_VBLANK))
CLUTTER_DBG("vblank sync: no use-able mechanism found");
}
}
/**
* 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)
{
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.
2006-11-15 23:37:53 +00:00
* clutter_feature_get_all:
*
* Returns all the suppoerted 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.
2006-11-15 23:37:53 +00:00
clutter_feature_get_all (void)
{
return __features->flags;
}
void
clutter_feature_wait_for_vblank (void)
{
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;
drm_wait_vblank (__features->dri_fd, &blank);
}
break;
case CLUTTER_VBLANK_NONE:
default:
break;
}
}