This implements a variation of frustum culling whereby we convert screen
space clip rectangles into eye space mini-frustums so that we don't have
to repeatedly transform actor paint-volumes all the way into screen
coordinates to perform culling, we just have to apply the modelview
transform and then determine each points distance from the planes that
make up the clip frustum.
By avoiding the projective transform, perspective divide and viewport
scale for each point culled this makes culling much cheaper.
ClutterX11TexturePixmap watches for configure events to tell when it
needs to name a new pixmap for the window. However, ConfigureEvents
occur on moves in addition to resizes, and doing round trips and
naming new pixmaps every time a window is moved is a real performance
killer.
Add clutter_x11_texture_pixmap_sync_window_internal() that takes the
size/position of the window as arguments rather than always calling
XGetWindowAttributes. This allows us to bypass all work other than
notifying the window-x/window-y properties when we get a ConfigurEvent
for a move.
The last received width/height is saved to allow us to also omit
XGetWindowAttributes on MapNotify events.
The public clutter_x11_texture_pixmap_sync_window() becomes a bit less
efficient since we no longer combine the roundtrips for
XGetWindowAttributes() and XCompositeNameWindowPixmap(), but it appears
to have no callers in current publicly available code.
Several FIXME's are added for areas where there are still weird things
going on in the code or improvements could be made.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2356
Since we allow compiling Clutter without the XComposite extension
available, we need to protect the calls to the XComposite API with
the guards provided by the configure script.
One of the later changes made on the paint volume branch before merging
with master was to make paint volumes opt in only since we couldn't make
any safe assumptions about how custom actors may constrain their
painting. We added very conservative implementations for the existing
Clutter actors - including for ClutterTexture which
ClutterX11TexturePixmap is a sub-class of - but we were conservative to
the extent of explicitly checking the GType of the actor so we would
avoid making any assumptions about sub-classes. The upshot was that we
neglected to implement the get_paint_volume vfunc for
ClutterX11TexturePixmap.
This patch provides an implementation that simply reports the actor's
allocation as its paint volume. Also unlike for other core actors it
doesn't explicitly check the GType so we are assuming that all existing
sub-classes of ClutterX11TexturePixmap constrain their drawing to the
actor's transformed allocation. If anyone does want to draw outside the
allocation in future sub-classes, then they should also provide an
updated get_paint_volume implementation.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2349
There is an internal _clutter_actor_queue_redraw_with_clip API that gets
used for texture-from-pixmap to minimize what we redraw in response to
Damage events. It was previously working in terms of a ClutterActorBox
but it has now been changed so an actor can queue a redraw of volume
instead.
The plan is that clutter_actor_queue_redraw will start to transparently
use _clutter_actor_queue_redraw_with_clip when it can determine a paint
volume for the actor.
I think this is what commit 2cf1405506 intended to do since it
specifically mentioned cleaning up the trap in
clutter_x11_texture_pixmap_set_pixmap, but although it moved the untrap
to only be done in the case where Pixmap != None it left the position of
the trap itself unchanged. This meant the error trapping wouldn't be
balanced if pixmap == None since the untrap wouldn't be done. We now
only trap and untrap around the XGetGeometry call done when pixmap !=
None.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2303
With currently distributed versions of Mesa, calling XFreePixmap()
before glxDestroyPixmap() will cause an X error from DRI. So, we
need to make sure that we get rid of the CoglTexturePixmapX11 before
we XFreePixmap().
clutter_x11_texture_pixmap_dispose(): Call
clutter_x11_texture_pixmap_set_pixmap() instead of using XFreePixmap
directly so that we leverage the text-clearing hack and destroy
things in the right order.
clutter_x11_texture_pixmap_set_pixmap(): Don't do a pointless roundtrip
and trap a pointless error when setting pixmap to None.
clutter_x11_texture_pixmap_set_pixmap(): Free damage resources when
we are setting Pixmap to None.
clutter_x11_texture_pixmap_set_window(): When setting a new window
or setting the window to None, immedediately call
cluter_x11_texture_pixmap_set_pixmap(). This means that set_window(None)
immediately will free any referenced resources related to the window.
http://bugzilla.clutter-project.org/show_bug.cgi?id=2303
The pixmap handling of both of the texture pixmap actors in Clutter is
now removed and instead it just creates a CoglTexturePixmapX11. Both
actors are now equivalent so there is no need to choose between the
two.
The marshallers we use for the signals are declared in a private header,
and it stands to reason that they should also be hidden in the shared
object by using the common '_' prefix. We are also using some direct
g_cclosure_marshal_* symbol from GLib, instead of consistently use the
clutter_marshal_* symbol.
While this is totally fine (0 in the pointer context will be converted
in the right internal NULL representation, which could be a value with
some bits to 1), I believe it's clearer to use NULL in the pointer
context.
It seems that, in most case, it's more an overlook than a deliberate
choice to use FALSE/0 as NULL, eg. copying a _COGL_GET_CONTEXT (ctx, 0)
or a g_return_val_if_fail (cond, 0) from a function returning a
gboolean.
ClutterX11TexturePixmap calls get_allocation_box() when queueing a
clipped redraw. If the allocation is not valid, and if we queue a
lot of redraws in response to a series of damage events, the net
result is that we spend all our time in a re-layout. We can
short-circuit this by checking if the actor has a valid allocation, and
if not, just queue a redraw - the actor will be allocated by the time it
is going to be painted.
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
A new (internal only currently) API, _clutter_actor_queue_clipped_redraw
can be used to queue a redraw along with a clip rectangle in actor
coordinates. This clip rectangle propagates up to the stage and clutter
backend which may optionally use the information to optimize stage
redraws. The GLX backend in particular may scissor the next redraw to
the clip rectangle and use GLX_MESA_copy_sub_buffer to present the stage
subregion.
The intention is that any actors that can naturally determine the bounds
of updates should queue clipped redraws to reduce the cost of updating
small regions of the screen.
Notes:
» If GLX_MESA_copy_sub_buffer isn't available then the GLX backend
ignores any clip rectangles.
» queuing multiple clipped redraws will result in the bounding box of
each clip rectangle being used.
» If a clipped redraw has a height > 300 pixels then it's promoted into
a full stage redraw, so that the GPU doesn't end up blocking too long
waiting for the vsync to reach the optimal position to avoid tearing.
» Note: no empirical data was used to come up with this threshold so
we may need to tune this.
» Currently only ClutterX11TexturePixmap makes use of this new API. This
is done via a new "queue-damage-redraw" signal that is emitted when
the pixmap is updated. The default handler queues a clipped redraw
with the assumption that the pixmap is being painted as a rectangle
covering the actors transformed allocation. If you subclass
ClutterX11TexturePixmap and change how it's painted you now also
need to override the signal handler and queue your own redraw.
Technically this is a semantic break, but it's assumed that no one
is currently doing this.
This still leaves a few unsolved issues with regards to optimizing sub
stage redraws that need to be addressed in further work so this can only
be considered a stepping stone a this point:
» Because we have no reliable way to determine if the painting of any
given actor is being modified any optimizations implemented using
_clutter_actor_queue_redraw_with_clip must be overridable by a
subclass, and technically must be opt-in for existing classes to avoid
a change in semantics. E.g. consider that a user connects to the paint
signal for ClutterTexture and paints a circle instead of a rectangle.
In this case any original logic to queue clipped redraws would be
incorrect.
» Currently only the implementation of an actor has enough information
with which to queue clipped redraws. E.g. It is not possible for
generic code in clutter-actor.c to queue a clipped redraw when hiding
an actor because actors have no way to report a "paint box". (remember
actors can draw outside their allocation and actors with depth may
also be projected outside of their allocation)
» The current plan is to add a actor_class->get_paint_cuboid()
virtual so actors can report a bounding cube for everything they
would draw in their current state and use that to queue clipped
redraws against the stage by projecting the paint cube into stage
coordinates.
» Our heuristics for promoting clipped redraws into full redraws to
avoid blocking the GPU while we wait for the vsync need improving:
» vsync issues aren't relevant for redirected/composited applications
so they should use different heuristics. In this case we instead
need to trade off the cost of blitting when using glXCopySubBuffer
vs promoting to a full redraw and flipping instead.
Since using addresses that might change is something that finally
the FSF acknowledge as a plausible scenario (after changing address
twice), the license blurb in the source files should use the URI
for getting the license in case the library did not come with it.
Not that URIs cannot possibly change, but at least it's easier to
set up a redirection at the same place.
As a side note: this commit closes the oldes bug in Clutter's bug
report tool.
http://bugzilla.openedhand.com/show_bug.cgi?id=521
Destroy the dummy XImage we create even on success.
http://bugzilla.openedhand.com/show_bug.cgi?id=1918
Based on a patch by: Carlos Martín Nieto <carlos@cmartin.tk>
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
If clutter_x11_texture_set_window() was called after
clutter_x11_texture_pixmap_set_automatic(), then the Damage object would
not be properly created so updates to the window were ignored.
Refactor creation of the damage object to a separate function, and
call it from clutter_x11_texture_set_window() and clutter_x11_texture_set_pixmap()
as appropriate. Addition and removal of the filter function is made
conditional on priv->damage to make free_damage_resources() cleanly
idempotent.
See: http://bugzilla.gnome.org/show_bug.cgi?id=587189 for the original
bug report.
http://bugzilla.openedhand.com/show_bug.cgi?id=1710
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
If we have an not-visible texture pixmap, we need to:
- Still update it if it is realized, since it won't be
updated when shown. And it might be also be cloned.
- Queue a redraw if even if not visible, since it
it might be cloned.
http://bugzilla.openedhand.com/show_bug.cgi?id=1647
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
RGBA data in X pixmaps and in FBOs is already premultiplied; use
the right format when creating cogl textures.
http://bugzilla.openedhand.com/show_bug.cgi?id=1406
Signed-off-by: Robert Bragg <robert@linux.intel.com>
An implementaton of realize() never needs to set the
CLUTTER_ACTOR_REALIZED flag, though it can unset the flag if
things fail unexpectedly. (Previously, stage backend implementations
had to do this since clutter_actor_realize() wasn't used; this
is no longer the case.)
http://bugzilla.openedhand.com/show_bug.cgi?id=1634
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
A lockup was reported by fargoilas on #clutter and removing the server grab in
clutter_x11_texture_pixmap_sync_window fixed the problem.
We were doing an x server grab to guarantee that if the XGetWindowAttributes
request reported that our redirected window was viewable then we would also
be able to get a valid pixmap name. (the composite protocol says it's an
error to request a name for a window if it's not viewable) Without the grab
there would be a race condition.
Instead we now handle error conditions gracefully.
While X11 Pixmap and Window types only have 32-bits of data, they
are actually 'unsigned long'. Change the "window" and "pixmap"
property of ClutterX11TexturePixmaps to be ulong.
This fixes 64-bit bugs where ClutterGLXTexturePixmap passed a
reference to Pixmap to g_object_get("pixmap", &pixmap, ...);
http://bugzilla.openedhand.com/show_bug.cgi?id=1405
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
* clutter/clutter-actor.c:
* clutter/clutter-actor.h:
* clutter/clutter-clone-texture.c:
* clutter/clutter-private.h:
* clutter/clutter-texture.c:
* clutter/x11/clutter-x11-texture-pixmap.c:
Attempt to lower overhead of updating TFP's (particularly mipmaped).
Compresses mipmap updates only for visible TFPs.
Avoiding updates for non visible TFP's whilst keeping visible
clones working ok.
* clutter/glx/clutter-glx-texture-pixmap.c:
* clutter/x11/clutter-x11-texture-pixmap.c:
TFP resyncing on MapNotify/ConfigureNotify (bug 1020; patch by
Andy Wingo <wingo@pobox.com>).
Bug 1007 - Fix TFP fallback mechanism
* clutter/glx/clutter-glx-texture-pixmap.c:
* clutter/x11/clutter-x11-texture-pixmap.c:
Add some extra safety to glx pixmap creations and tidy up some notes.
Patch from Gwenole Beauchesne.
Bug 997 - automatic updates not working for named TFP pixmaps,
at least in x11
* clutter/glx/clutter-glx-texture-pixmap.c:
* clutter/glx/clutter-glx-texture-pixmap.h:
* clutter/x11/clutter-backend-x11.c:
* clutter/x11/clutter-x11-texture-pixmap.c:
* clutter/x11/clutter-x11-texture-pixmap.h:
* clutter/x11/clutter-x11.h:
* configure.ac:
* tests/test-pixmap.c:
Rework Andy Wingos patch a little adding more safety for now also
handling redirect Windows (as well as pixmaps)
* clutter/glx/clutter-glx-texture-pixmap.c:
Dont always fallback to x11 (slow) updates for a single
failed pixmap.
Minor cleanups.
* clutter/x11/clutter-x11-texture-pixmap.c:
Move shm allocation to only area updates.
* clutter/x11/clutter-x11-texture-pixmap.c:
* configure.ac:
* tests/Makefile.am:
Remove the XComposite dep from Clutter itself, just use
in test-pixmap (if available)
* clutter/x11/clutter-x11-texture-pixmap.c:
In clutter_x11_texture_pixmap_set_pixmap, dont assume that the actor
size should be changed to match the size of the pixmap.
Work related to #873;
* clutter/glx/clutter-backend-glx.c:
* clutter/glx/clutter-backend-glx.h:
* clutter/x11/clutter-x11-texture-pixmap.c:
* clutter/x11/clutter-x11-texture-pixmap.h:
General cleanup of texture pixmap code, adding;
- Pixmap dimentions and depth now auto probed, read only props.
- More X safety traps
- Add support for optionally tracking damage and automatically
updating texture.
* clutter/glx/clutter-glx-texture-pixmap.c:
* clutter/glx/clutter-glx-texture-pixmap.h:
General cleanup and some safety additions. Needs more work so
'proper' subclass - dependent on new COGL.
* clutter/x11/clutter-backend-x11.c: (clutter_x11_remove_filter):
Invert g_return_if check.
* configure.ac:
Pull in XComposite and XDamage (at least for now)
* tests/Makefile.am:
* tests/test-pixmap.c:
Add a modified test from Johan for above.
