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mutter/clutter/cogl/clutter-stage-cogl.c
Emmanuele Bassi 253292802c Drop the UProf dependency 
Nobody has been compiling Clutter with profiling enabled in a long time.

UProf itself hasn't been updated in 5 years, and it still depends on
deprecated components like dbus-glib, with no port to GDBus in sight.

The profiling code was moderately useful in the past, but these days
it's probably better to profile Cogl than Clutter itself; timing
information can be extracted by the timestamp on each diagnostic message
that is now available by default in the CLUTTER_NOTE macro, and we can
add ad hoc counters where needed.
2015-03-03 17:44:15 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2007,2008,2009,2010,2011 Intel Corporation.
*
* 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, see <http://www.gnu.org/licenses/>.
* Authors:
* Matthew Allum
* Robert Bragg
* Neil Roberts
* Emmanuele Bassi
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-config.h"
#include "clutter-stage-cogl.h"
#include "clutter-actor-private.h"
#include "clutter-backend-private.h"
#include "clutter-debug.h"
#include "clutter-event.h"
#include "clutter-enum-types.h"
#include "clutter-feature.h"
#include "clutter-main.h"
#include "clutter-private.h"
#include "clutter-stage-private.h"
static void clutter_stage_window_iface_init (ClutterStageWindowIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterStageCogl,
_clutter_stage_cogl,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_STAGE_WINDOW,
clutter_stage_window_iface_init));
enum {
PROP_0,
PROP_WRAPPER,
PROP_BACKEND,
PROP_LAST
};
static void
clutter_stage_cogl_unrealize (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
CLUTTER_NOTE (BACKEND, "Unrealizing Cogl stage [%p]", stage_cogl);
if (stage_cogl->onscreen != NULL)
{
cogl_onscreen_remove_frame_callback (stage_cogl->onscreen,
stage_cogl->frame_closure);
stage_cogl->frame_closure = NULL;
cogl_object_unref (stage_cogl->onscreen);
stage_cogl->onscreen = NULL;
}
}
static void
frame_cb (CoglOnscreen *onscreen,
CoglFrameEvent event,
CoglFrameInfo *info,
void *user_data)
{
ClutterStageCogl *stage_cogl = user_data;
if (event == COGL_FRAME_EVENT_SYNC)
{
/* Early versions of the swap_event implementation in Mesa
* deliver BufferSwapComplete event when not selected for,
* so if we get a swap event we aren't expecting, just ignore it.
*
* https://bugs.freedesktop.org/show_bug.cgi?id=27962
*
* FIXME: This issue can be hidden inside Cogl so we shouldn't
* need to care about this bug here.
*/
if (stage_cogl->pending_swaps > 0)
stage_cogl->pending_swaps--;
}
else if (event == COGL_FRAME_EVENT_COMPLETE)
{
gint64 presentation_time_cogl = cogl_frame_info_get_presentation_time (info);
if (presentation_time_cogl != 0)
{
CoglContext *context = cogl_framebuffer_get_context (COGL_FRAMEBUFFER (onscreen));
gint64 current_time_cogl = cogl_get_clock_time (context);
gint64 now = g_get_monotonic_time ();
stage_cogl->last_presentation_time =
now + (presentation_time_cogl - current_time_cogl) / 1000;
}
stage_cogl->refresh_rate = cogl_frame_info_get_refresh_rate (info);
}
}
static gboolean
clutter_stage_cogl_realize (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
ClutterBackend *backend;
CoglFramebuffer *framebuffer;
GError *error = NULL;
gfloat width = 800;
gfloat height = 600;
CLUTTER_NOTE (BACKEND, "Realizing stage '%s' [%p]",
G_OBJECT_TYPE_NAME (stage_cogl),
stage_cogl);
backend = clutter_get_default_backend ();
if (stage_cogl->onscreen == NULL)
{
stage_cogl->onscreen = cogl_onscreen_new (backend->cogl_context,
width, height);
}
cogl_onscreen_set_swap_throttled (stage_cogl->onscreen,
_clutter_get_sync_to_vblank ());
framebuffer = COGL_FRAMEBUFFER (stage_cogl->onscreen);
if (!cogl_framebuffer_allocate (framebuffer, &error))
{
g_warning ("Failed to allocate stage: %s", error->message);
g_error_free (error);
cogl_object_unref (stage_cogl->onscreen);
stage_cogl->onscreen = NULL;
return FALSE;
}
/* FIXME: for fullscreen Cogl platforms then the size we gave
* will be ignored, so we need to make sure the stage size is
* updated to this size. */
stage_cogl->frame_closure =
cogl_onscreen_add_frame_callback (stage_cogl->onscreen,
frame_cb,
stage_cogl,
NULL);
return TRUE;
}
static void
clutter_stage_cogl_schedule_update (ClutterStageWindow *stage_window,
gint sync_delay)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
gint64 now;
float refresh_rate;
gint64 refresh_interval;
if (stage_cogl->update_time != -1)
return;
now = g_get_monotonic_time ();
if (sync_delay < 0)
{
stage_cogl->update_time = now;
return;
}
/* We only extrapolate presentation times for 150ms - this is somewhat
* arbitrary. The reasons it might not be accurate for larger times are
* that the refresh interval might be wrong or the vertical refresh
* might be downclocked if nothing is going on onscreen.
*/
if (stage_cogl->last_presentation_time == 0||
stage_cogl->last_presentation_time < now - 150000)
{
stage_cogl->update_time = now;
return;
}
refresh_rate = stage_cogl->refresh_rate;
if (refresh_rate == 0.0)
refresh_rate = 60.0;
refresh_interval = (gint64) (0.5 + 1000000 / refresh_rate);
if (refresh_interval == 0)
refresh_interval = 16667; /* 1/60th second */
stage_cogl->update_time = stage_cogl->last_presentation_time + 1000 * sync_delay;
while (stage_cogl->update_time < now)
stage_cogl->update_time += refresh_interval;
}
static gint64
clutter_stage_cogl_get_update_time (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
if (stage_cogl->pending_swaps)
return -1; /* in the future, indefinite */
return stage_cogl->update_time;
}
static void
clutter_stage_cogl_clear_update_time (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
stage_cogl->update_time = -1;
}
static ClutterActor *
clutter_stage_cogl_get_wrapper (ClutterStageWindow *stage_window)
{
return CLUTTER_ACTOR (CLUTTER_STAGE_COGL (stage_window)->wrapper);
}
static void
clutter_stage_cogl_show (ClutterStageWindow *stage_window,
gboolean do_raise)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
clutter_actor_map (CLUTTER_ACTOR (stage_cogl->wrapper));
}
static void
clutter_stage_cogl_hide (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
clutter_actor_unmap (CLUTTER_ACTOR (stage_cogl->wrapper));
}
static void
clutter_stage_cogl_get_geometry (ClutterStageWindow *stage_window,
cairo_rectangle_int_t *geometry)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
int window_scale;
window_scale = _clutter_stage_window_get_scale_factor (stage_window);
if (geometry != NULL)
{
if (stage_cogl->onscreen)
{
CoglFramebuffer *framebuffer =
COGL_FRAMEBUFFER (stage_cogl->onscreen);
geometry->x = geometry->y = 0;
geometry->width = cogl_framebuffer_get_width (framebuffer) / window_scale;
geometry->height = cogl_framebuffer_get_height (framebuffer) / window_scale;
}
else
{
geometry->x = geometry->y = 0;
geometry->width = 800;
geometry->height = 600;
}
}
}
static void
clutter_stage_cogl_resize (ClutterStageWindow *stage_window,
gint width,
gint height)
{
}
static gboolean
clutter_stage_cogl_has_redraw_clips (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
/* NB: at the start of each new frame there is an implied clip that
* clips everything (i.e. nothing would be drawn) so we need to make
* sure we return True in the un-initialized case here.
*
* NB: a clip width of 0 means a full stage redraw has been queued
* so we effectively don't have any redraw clips in that case.
*/
if (!stage_cogl->initialized_redraw_clip ||
(stage_cogl->initialized_redraw_clip &&
stage_cogl->bounding_redraw_clip.width != 0))
return TRUE;
else
return FALSE;
}
static gboolean
clutter_stage_cogl_ignoring_redraw_clips (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
/* NB: a clip width of 0 means a full stage redraw is required */
if (stage_cogl->initialized_redraw_clip &&
stage_cogl->bounding_redraw_clip.width == 0)
return TRUE;
else
return FALSE;
}
/* A redraw clip represents (in stage coordinates) the bounding box of
* something that needs to be redraw. Typically they are added to the
* StageWindow as a result of clutter_actor_queue_clipped_redraw() by
* actors such as ClutterGLXTexturePixmap. All redraw clips are
* discarded after the next paint.
*
* A NULL stage_clip means the whole stage needs to be redrawn.
*
* What we do with this information:
* - we keep track of the bounding box for all redraw clips
* - when we come to redraw; we scissor the redraw to that box and use
* glBlitFramebuffer to present the redraw to the front
* buffer.
*/
static void
clutter_stage_cogl_add_redraw_clip (ClutterStageWindow *stage_window,
cairo_rectangle_int_t *stage_clip)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
/* If we are already forced to do a full stage redraw then bail early */
if (clutter_stage_cogl_ignoring_redraw_clips (stage_window))
return;
/* A NULL stage clip means a full stage redraw has been queued and
* we keep track of this by setting a zero width
* stage_cogl->bounding_redraw_clip */
if (stage_clip == NULL)
{
stage_cogl->bounding_redraw_clip.width = 0;
stage_cogl->initialized_redraw_clip = TRUE;
return;
}
/* Ignore requests to add degenerate/empty clip rectangles */
if (stage_clip->width == 0 || stage_clip->height == 0)
return;
if (!stage_cogl->initialized_redraw_clip)
{
stage_cogl->bounding_redraw_clip = *stage_clip;
}
else if (stage_cogl->bounding_redraw_clip.width > 0)
{
_clutter_util_rectangle_union (&stage_cogl->bounding_redraw_clip,
stage_clip,
&stage_cogl->bounding_redraw_clip);
}
stage_cogl->initialized_redraw_clip = TRUE;
}
static gboolean
clutter_stage_cogl_get_redraw_clip_bounds (ClutterStageWindow *stage_window,
cairo_rectangle_int_t *stage_clip)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
if (stage_cogl->using_clipped_redraw)
{
*stage_clip = stage_cogl->bounding_redraw_clip;
return TRUE;
}
return FALSE;
}
/* XXX: This is basically identical to clutter_stage_glx_redraw */
static void
clutter_stage_cogl_redraw (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
cairo_rectangle_int_t geom;
gboolean have_clip;
gboolean may_use_clipped_redraw;
gboolean use_clipped_redraw;
gboolean can_blit_sub_buffer;
gboolean has_buffer_age;
ClutterActor *wrapper;
cairo_rectangle_int_t *clip_region;
gboolean force_swap;
int window_scale;
wrapper = CLUTTER_ACTOR (stage_cogl->wrapper);
if (!stage_cogl->onscreen)
return;
can_blit_sub_buffer =
cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION);
has_buffer_age = cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE);
_clutter_stage_window_get_geometry (stage_window, &geom);
/* NB: a zero width redraw clip == full stage redraw */
have_clip = (stage_cogl->bounding_redraw_clip.width != 0 &&
!(stage_cogl->bounding_redraw_clip.x == 0 &&
stage_cogl->bounding_redraw_clip.y == 0 &&
stage_cogl->bounding_redraw_clip.width == geom.width &&
stage_cogl->bounding_redraw_clip.height == geom.height));
may_use_clipped_redraw = FALSE;
if (_clutter_stage_window_can_clip_redraws (stage_window) &&
(can_blit_sub_buffer || has_buffer_age) &&
have_clip &&
/* some drivers struggle to get going and produce some junk
* frames when starting up... */
stage_cogl->frame_count > 3)
{
may_use_clipped_redraw = TRUE;
clip_region = &stage_cogl->bounding_redraw_clip;
}
else
clip_region = NULL;
if (may_use_clipped_redraw &&
G_LIKELY (!(clutter_paint_debug_flags & CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS)))
use_clipped_redraw = TRUE;
else
use_clipped_redraw = FALSE;
force_swap = FALSE;
window_scale = _clutter_stage_window_get_scale_factor (stage_window);
if (use_clipped_redraw)
{
if (has_buffer_age)
{
int age = cogl_onscreen_get_buffer_age (stage_cogl->onscreen);
cairo_rectangle_int_t *current_damage;
current_damage = g_new0 (cairo_rectangle_int_t, 1);
current_damage->x = clip_region->x;
current_damage->y = clip_region->y;
current_damage->width = clip_region->width;
current_damage->height = clip_region->height;
stage_cogl->damage_history = g_slist_prepend (stage_cogl->damage_history, current_damage);
if (age != 0 && !stage_cogl->dirty_backbuffer && g_slist_length (stage_cogl->damage_history) > age)
{
int i = 0;
GSList *tmp = NULL;
/* We skip the first entry because it is the clip_region itself */
for (tmp = stage_cogl->damage_history->next; tmp; tmp = tmp->next)
{
_clutter_util_rectangle_union (clip_region, tmp->data, clip_region);
i++;
if (i == age)
{
g_slist_free_full (tmp->next, g_free);
tmp->next = NULL;
}
}
force_swap = TRUE;
CLUTTER_NOTE (CLIPPING, "Reusing back buffer - repairing region: x=%d, y=%d, width=%d, height=%d\n",
clip_region->x,
clip_region->y,
clip_region->width,
clip_region->height);
}
else if (age == 0 || stage_cogl->dirty_backbuffer)
{
CLUTTER_NOTE (CLIPPING, "Invalid back buffer: Resetting damage history list.\n");
g_slist_free_full (stage_cogl->damage_history, g_free);
stage_cogl->damage_history = NULL;
}
}
}
else if (has_buffer_age)
{
CLUTTER_NOTE (CLIPPING, "Unclipped redraw: Resetting damage history list.\n");
g_slist_free_full (stage_cogl->damage_history, g_free);
stage_cogl->damage_history = NULL;
}
if (has_buffer_age && !force_swap)
use_clipped_redraw = FALSE;
if (use_clipped_redraw)
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (stage_cogl->onscreen);
CLUTTER_NOTE (CLIPPING,
"Stage clip pushed: x=%d, y=%d, width=%d, height=%d\n",
clip_region->x,
clip_region->y,
clip_region->width,
clip_region->height);
stage_cogl->using_clipped_redraw = TRUE;
cogl_framebuffer_push_scissor_clip (fb,
clip_region->x * window_scale,
clip_region->y * window_scale,
clip_region->width * window_scale,
clip_region->height * window_scale);
_clutter_stage_do_paint (CLUTTER_STAGE (wrapper), clip_region);
cogl_framebuffer_pop_clip (fb);
stage_cogl->using_clipped_redraw = FALSE;
}
else
{
CLUTTER_NOTE (CLIPPING, "Unclipped stage paint\n");
/* If we are trying to debug redraw issues then we want to pass
* the bounding_redraw_clip so it can be visualized */
if (G_UNLIKELY (clutter_paint_debug_flags & CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS) &&
may_use_clipped_redraw)
{
_clutter_stage_do_paint (CLUTTER_STAGE (wrapper), clip_region);
}
else
_clutter_stage_do_paint (CLUTTER_STAGE (wrapper), NULL);
}
if (may_use_clipped_redraw &&
G_UNLIKELY ((clutter_paint_debug_flags & CLUTTER_DEBUG_REDRAWS)))
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (stage_cogl->onscreen);
CoglContext *ctx = cogl_framebuffer_get_context (fb);
static CoglPipeline *outline = NULL;
cairo_rectangle_int_t *clip = &stage_cogl->bounding_redraw_clip;
ClutterActor *actor = CLUTTER_ACTOR (wrapper);
float x_1 = clip->x * window_scale;
float x_2 = clip->x + clip->width * window_scale;
float y_1 = clip->y * window_scale;
float y_2 = clip->y + clip->height * window_scale;
CoglVertexP2 quad[4] = {
{ x_1, y_1 },
{ x_2, y_1 },
{ x_2, y_2 },
{ x_1, y_2 }
};
CoglPrimitive *prim;
CoglMatrix modelview;
if (outline == NULL)
{
outline = cogl_pipeline_new (ctx);
cogl_pipeline_set_color4ub (outline, 0xff, 0x00, 0x00, 0xff);
}
prim = cogl_primitive_new_p2 (ctx,
COGL_VERTICES_MODE_LINE_LOOP,
4, /* n_vertices */
quad);
cogl_framebuffer_push_matrix (fb);
cogl_matrix_init_identity (&modelview);
_clutter_actor_apply_modelview_transform (actor, &modelview);
cogl_framebuffer_set_modelview_matrix (fb, &modelview);
cogl_framebuffer_draw_primitive (COGL_FRAMEBUFFER (stage_cogl->onscreen),
outline,
prim);
cogl_framebuffer_pop_matrix (fb);
cogl_object_unref (prim);
}
/* push on the screen */
if (use_clipped_redraw && !force_swap)
{
cairo_rectangle_int_t *clip = clip_region;
int copy_area[4];
/* XXX: It seems there will be a race here in that the stage
* window may be resized before the cogl_onscreen_swap_region
* is handled and so we may copy the wrong region. I can't
* really see how we can handle this with the current state of X
* but at least in this case a full redraw should be queued by
* the resize anyway so it should only exhibit temporary
* artefacts.
*/
copy_area[0] = clip->x * window_scale;
copy_area[1] = clip->y * window_scale;
copy_area[2] = clip->width * window_scale;
copy_area[3] = clip->height * window_scale;
CLUTTER_NOTE (BACKEND,
"cogl_onscreen_swap_region (onscreen: %p, "
"x: %d, y: %d, "
"width: %d, height: %d)",
stage_cogl->onscreen,
copy_area[0], copy_area[1], copy_area[2], copy_area[3]);
cogl_onscreen_swap_region (stage_cogl->onscreen, copy_area, 1);
}
else
{
CLUTTER_NOTE (BACKEND, "cogl_onscreen_swap_buffers (onscreen: %p)",
stage_cogl->onscreen);
/* If we have swap buffer events then cogl_onscreen_swap_buffers
* will return immediately and we need to track that there is a
* swap in progress... */
if (clutter_feature_available (CLUTTER_FEATURE_SWAP_EVENTS))
stage_cogl->pending_swaps++;
cogl_onscreen_swap_buffers (stage_cogl->onscreen);
}
/* reset the redraw clipping for the next paint... */
stage_cogl->initialized_redraw_clip = FALSE;
/* We have repaired the backbuffer */
stage_cogl->dirty_backbuffer = FALSE;
stage_cogl->frame_count++;
}
static CoglFramebuffer *
clutter_stage_cogl_get_active_framebuffer (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
return COGL_FRAMEBUFFER (stage_cogl->onscreen);
}
static void
clutter_stage_cogl_dirty_back_buffer (ClutterStageWindow *stage_window)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
stage_cogl->dirty_backbuffer = TRUE;
}
static void
clutter_stage_cogl_get_dirty_pixel (ClutterStageWindow *stage_window,
int *x,
int *y)
{
ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
gboolean has_buffer_age = cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE);
if ((stage_cogl->damage_history == NULL && has_buffer_age) || !has_buffer_age)
{
*x = 0;
*y = 0;
}
else
{
cairo_rectangle_int_t *rect;
rect = (cairo_rectangle_int_t *) (stage_cogl->damage_history->data);
*x = rect->x;
*y = rect->y;
}
}
static void
clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
{
iface->realize = clutter_stage_cogl_realize;
iface->unrealize = clutter_stage_cogl_unrealize;
iface->get_wrapper = clutter_stage_cogl_get_wrapper;
iface->get_geometry = clutter_stage_cogl_get_geometry;
iface->resize = clutter_stage_cogl_resize;
iface->show = clutter_stage_cogl_show;
iface->hide = clutter_stage_cogl_hide;
iface->schedule_update = clutter_stage_cogl_schedule_update;
iface->get_update_time = clutter_stage_cogl_get_update_time;
iface->clear_update_time = clutter_stage_cogl_clear_update_time;
iface->add_redraw_clip = clutter_stage_cogl_add_redraw_clip;
iface->has_redraw_clips = clutter_stage_cogl_has_redraw_clips;
iface->ignoring_redraw_clips = clutter_stage_cogl_ignoring_redraw_clips;
iface->get_redraw_clip_bounds = clutter_stage_cogl_get_redraw_clip_bounds;
iface->redraw = clutter_stage_cogl_redraw;
iface->get_active_framebuffer = clutter_stage_cogl_get_active_framebuffer;
iface->dirty_back_buffer = clutter_stage_cogl_dirty_back_buffer;
iface->get_dirty_pixel = clutter_stage_cogl_get_dirty_pixel;
}
static void
clutter_stage_cogl_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterStageCogl *self = CLUTTER_STAGE_COGL (gobject);
switch (prop_id)
{
case PROP_WRAPPER:
self->wrapper = g_value_get_object (value);
break;
case PROP_BACKEND:
self->backend = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
_clutter_stage_cogl_class_init (ClutterStageCoglClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = clutter_stage_cogl_set_property;
g_object_class_override_property (gobject_class, PROP_WRAPPER, "wrapper");
g_object_class_override_property (gobject_class, PROP_BACKEND, "backend");
}
static void
_clutter_stage_cogl_init (ClutterStageCogl *stage)
{
stage->last_presentation_time = 0;
stage->refresh_rate = 0.0;
stage->update_time = -1;
}
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