This allows to enable freedreno and intel backends at the same time
building the prerequisites for adding further ones.
[Pekka: fix configure.ac if statements]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
If dbus support is explicitly disabled, $have_dbus should be no, but was
empty. systemd-login support depends on dbus, but the check does not
trigger correctly, if $have_dbus is empty.
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This is already done when weston_output_init_geometry() is called.
Actually this is a fix for 8564a0d, because without this patch, the
compositor sometimes crashes when setting output transform
Signed-off-by: Ilia Bozhinov <ammen99@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Add the respective CFLAGS to the build, otherwise it will error out as
seen below.
src/libinput-seat.c:30:22: fatal error: libinput.h: No such file or directory
v2: add the CFLAGS only as needed, suggested by Pekka
Cc: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Cc: Jan Engelhardt <jengelh@inai.de>
[Emil Velikov: polish commit message, v2]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
The timestamp could be either NULL if there's no mode set, or 0 when output gets
awaken. It either crashes weston or we get vblanks at [0, 0] for that output.
Signed-off-by: Marius Vlad <marius-cristian.vlad@nxp.com>
CC: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
[Pekka: note, most start_repaint_loop pass in current time, not 0]
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
When a surface has a buffer at creation time we send an error, which results
in a disconnection and all resources being destroyed.
Since we send that error and return before performing the configure_list init
weston_desktop_xdg_surface_destroy() will walk an uninitialized list and
dereference a NULL pointer.
Initializing the list earlier prevents this from happening.
Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Continue moving bits to use toytimer instead of carelessly open-coded
equivalent. Many of the copies were flawed against the race mentioned
in toytimer_fire().
This patch handles window.c's key repeat, confine demo, and
desktop-shell panel clock.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>
There are multiple copies for the timerfd handling code, and I need a
timer in one more app. Consolidate all the timerfd code into window.c to
reduce the duplication. Many of the copies were also flawed against the
race mentioned in toytimer_fire().
This patch handles clickdot and window.c's tooltip timer and cursor
timer.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Due to race conditions, it is (vanishingly unlikely but) possible to
receive a wl_pointer.enter event referring to a wl_surface we have just
destroyed. If this happens, wl_surface will be NULL. Detect this, clear
out our focus, and return.
Other pointer and keyboard events are robust against destroyed surfaces.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
[Pekka: remove call to input_set_cursor()]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Do not attempt to set keyboard focus to a surface that has no
wl_resource. The destroy listener hangs off the wl_resource, so if that
is not present, nothing will clean up the pointer when the
weston_surface gets destroyed and it goes stale.
As keyboard_focus_resource_destroyed() sets the focus to NULL, this
patch should be enough to guarantee that the keyboard focus surface will
always have a wl_resource.
I have confirmed the added branch in weston_keyboard_set_focus() can be
hit, but doing so is hard.
My test case has weston/x11 with two outputs, and weston/wayland
--sprawl running on top of that, then closing the parent compositor
output windows one by one. Sometimes it hits, often it does not. Having
the window closing animation enabled may help to hit it.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Destroying an output (wl_surface) can race against the parent compositor
sending wl_keyboard.enter. When this race is lost, wayland-backend
receives wl_keyboard.enter with a NULL wl_surface for the surface it
just destroyed.
Handle this case by ignoring such enter events. Since it is
theoretically possible to follow enter with key events, drop those too.
The modifiers event is sent before enter, so we cannot drop that on the
same condition.
wl_keyboard.leave handler seems to already handle the NULL focus case,
but there is a question if the notify_keyboard_focus_out() call should
be avoided.
This patch fixes a hard to reproduce crash. I was running weston/x11
with two outputs, and weston/wayland --sprawl inside that, then closing
the parent compositor windows one by one. Sometimes it would trigger
this crash.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
EGL_IMG_context_priority allows the client to request that their
rendering be considered high priority. For ourselves, this is important
as we are interactive and any delay in our rendering causes input-output
jitter; a less than smooth user interactive. So if the driver supports
setting the context priority, try and create our EGLContext as high
priority. The driver may reject our request due to system restrictions,
in which case it will fallback to normal priority, but if successful it
will reschedule our rendering and all of its dependencies to execute
earlier, especially important when the GPU is being hogged by background
clients.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
If AddFB2 ever fails for any reason, we fall back to legacy AddFB, which
doesn't support the same swathe of formats, or multi-planar formats, or
modifiers.
This can happen with arbitrary client buffers, condemning us to the
fallback forever more. Remove this, at the cost of an unnecessary ioctl
for users on old kernels without AddFB2; unfortunately, we cannot detect
the complete absence of the ioctl, as the return here is -EINVAL rather
than -ENOTTY.
A check for whether or not the format is valid has been replaced with an
assert, as its callers either check that the format is non-zero, return
a FourCC format code from GBM, or use a static FourCC format.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Make it a bit more clear what the purpose of the variable is.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Nothing in this loop reorders views within the compositor's view_list.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
The direction of scrolling in the RDP compositor appears to be inverted.
When using Weston directly in X, sending X11 button 4 cuases window
contents to scroll up and button 4 to be reported to xwayland clients.
Conversely, when using Weston through RDP (xfreerdp client), sending
X11 button 4 causes window contents to scroll down and button 5 to be
reported to xwayland clients. The xfreerdp client does not seem to be
the cause of this since scrolling works correctly when connecting to
a Windows host.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: David Fort <contact@hardening-consulting.com>
Implement the zwp_input_timestamps_manager_v1.get_touch_timestamps
request to subscribe to timestamp events for wl_touch resources. Ensure
that the request handling code can gracefully handle inert touch
resources.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Implement the zwp_input_timestamps_manager_v1.get_pointer_timestamps
request to subscribe to timestamp events for wl_pointer resources.
Ensure that the request handling code can gracefully handle inert
pointer resources.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Implement the zwp_input_timestamps_manager_v1.get_keyboard_timestamps
request to subscribe to timestamp events for wl_keyboard resources.
Ensure that the request handling code can gracefully handle inert
keyboard resources.
This commit introduces a few internal helper functions which will also
be useful in the implementation of the remaining
zwp_input_timestamps_manager_v1 requests.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Introduce code to support the implementation of the
input_timestamps_unstable_v1 protocol in libweston. This commit does not
implement the actual timestamp subscriptions, but sets up the
zwp_input_timestamps_manager_v1 object and introduces dummy request
handling functions for it, laying the foundation for timestamp
subscriptions for keyboard/pointer/touch to be added cleanly in upcoming
commits.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Introduce helper test code to implement the client side of the
input_timestamps_unstable_v1 protocol. This helper will be used in
upcoming commits to test the server side implementation of the protocol
in libweston.
The input_timestamps_unstable_v1 protocol was introduced in version 1.13
of wayland-protocols, so this commit updates the version dependency in
configure.ac accordingly.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Add a helper function to check if two struct timespec values are equal.
This helper function will be used in upcoming commits that implement the
input_timestamps_unstable_v1 protocol.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
... to get the user_data. Like everywhere else through weston.
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Add a test to check that we can destroy and create the test seat. Since
after test seat destruction the test client releases any associated
input resources, this test also checks that libweston properly handles
release requests for inert input resources.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Use the weston-test-desktop-shell to run the devices tests, instead of
the currently used desktop-shell. The test desktop shell doesn't
interact with temporary globals (e.g. wl_seat), thus avoiding an
inherent race in the current wayland protocol when removing globals.
This will allow us to safely add tests which add/remove such globals in
upcoming commits.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
The current test client code waits for all wl_seat globals to arrive
before checking them and deciding which one is the test seat global to
use for the input object. Test code that needs to add/remove test seats
would have to call the client_set_input() function for any seat changes
to take effect. Although we could allow this by making
client_set_input() public, we would be exposing unecessary
implementation details.
This commit applies any seat changes immediately upon arrival of the
seat name, freeing test code from needing to call extra functions like
client_set_input(). To achieve this the call to input_data_devices() is
moved from client_set_input() to the seat name event handler.
This commit also moves the check that all seats have names to an
explicit test. To support this test, inputs corresponding to non-test
seats are not destroyed (unless their seat global is removed), as
was previously the case.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
The current test client code completely ignores removal of globals.
This commit updates the code to properly handle removal of globals in
general, and of seat globals in particular. This ensures that the test
client objects are in sync with the server and any relevant resources
are released accordingly.
This update will be used by upcoming tests to check that seat removal
and re-addition is working properly.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Ensure the server can safely handle client requests for wl_seat resource
that have become inert due to weston_seat object release and subsequent
destruction.
The clean-up involves, among other things, unsetting the destroyed
weston_seat object from the user data of wl_seat resources, and handling
this NULL user data case where required.
The list of sites extracting and using weston_seat object from wl_seat
resources which were audited for this patch are:
Legend:
N/A = Not Applicable (not implemented by weston)
FIXED = Fixed in the commit
OK = Already works correctly
== keyboard_shortcuts_inhibit_unstable_v1 ==
[N/A] zwp_keyboard_shortcuts_inhibit_manager_v1.inhibit_shortcuts
== tablet_input_unstable_v{1,2} ==
[N/A] zwp_tablet_manager_v{1,2}.get_tablet_seat
== text_input_unstable_v1 ==
[FIXED] zwp_text_input_v1.activate
[FIXED] zwp_text_input_v1.deactivate
== wl_data_device ==
[FIXED] wl_data_device_manager.get_data_device
[OK] wl_data_device.start_drag
[FIXED] wl_data_device.set_selection
[OK] wl_data_device.release
== wl_shell ==
[FIXED] wl_shell_surface.move
[FIXED] wl_shell_surface.resize
[FIXED] wl_shell_surface.set_popup
== xdg_shell and xdg_shell_unstable_v6 ==
[FIXED] xdg_toplevel.show_window_menu
[FIXED] xdg_toplevel.move
[FIXED] xdg_toplevel.resize
[FIXED] xdg_popup.grab
== xdg_shell_unstable_v5 ==
[FIXED] xdg_shell.get_xdg_popup
[FIXED] xdg_surface.show_window_menu
[FIXED] xdg_surface.move
[FIXED] xdg_surface.resize
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Properly clean up all sub-objects (e.g., weston_pointer_client objects)
when a weston_pointer object is destroyed. The clean-up ensures that the
server is able to safely handle client requests to any associated
pointer resources, which, as a consenquence of a weston_pointer
destruction, have now become inert.
The clean-up involves, among other things, unsetting the destroyed
weston_pointer object from the user data of pointer resources, and
handling this NULL user data case where required. Note that in many
sites affected by this change the existing code already properly handles
NULL weston_pointer (e.g. in init_pointer_constraint), so there is no
need for additional updates there.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Fix init_pointer_constraint so that it creates a valid, but inert,
resource if a NULL weston_pointer value is passed in. In that case no
constraint object is associated with the resource, but this is not an
issue since affected code can already handle NULL constraint objects.
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
ivi-shell tests load their own controller plugin
for testing purposes. Tests also uses the generated
weston-ivi.in config file, which causes weston to
load hmi-controller and its helper client.
Existence of hmi-controller and its helper client
confuses test plugins. Because they are creating
surfaces and layers which are not expected by
test plugins.
We can start ivi-shell tests without config file
to solve this problem. Then, weston will not load
hmi-controller plugin.
Reported-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Acked-by: Daniel Stone <daniels@collabora.com>
Drop support for the obsolete xdg-shell v5 protocol. This clears the
path to properly support xdg-shell stable, since xdg-shell stable and
xdg-shell v5 can't currently co-exist in the same compositor, as both
define structures with the same name (such as struct
xdg_surface_interface).
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
Proposed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Acked-by: Jonas Ådahl <jadahl@gmail.com>
/home/pq/git/weston/desktop-shell/shell.c: In function ‘shell_output_destroy_move_layer’:
/home/pq/git/weston/desktop-shell/shell.c:4718:24: warning: unused variable ‘output’ [-Wunused-variable]
struct weston_output *output = data;
Since the data pointer is not used for anything, decided to also set it
to NULL in the caller. This caused another variable to become unused.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Marius-Vlad <marius-cristian.vlad@nxp.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Leaks spotted by Valgrind.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Spotted by Valgrind.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Fixes the following Valgrind error:
==21607== Syscall param ioctl(generic) points to uninitialised byte(s)
==21607== at 0x5E8C787: ioctl (in /lib64/libc-2.25.so)
==21607== by 0x8220C17: drmIoctl (in /usr/lib64/libdrm.so.2.4.0)
==21607== by 0x82263CD: drmModeSetCrtc (in /usr/lib64/libdrm.so.2.4.0)
==21607== by 0x7B22095: drm_output_apply_state_legacy (compositor-drm.c:2107)
==21607== by 0x7B2335D: drm_pending_state_apply (compositor-drm.c:2539)
==21607== by 0x7B23AEB: drm_repaint_flush (compositor-drm.c:2773)
==21607== by 0x4E4A3E4: output_repaint_timer_handler (compositor.c:2500)
==21607== by 0x5081496: wl_event_source_timer_dispatch (event-loop.c:235)
==21607== by 0x5081B61: wl_event_loop_dispatch (event-loop.c:633)
==21607== by 0x50803A4: wl_display_run (wayland-server.c:1245)
==21607== by 0x409DD8: main (main.c:2644)
==21607== Address 0xffefff59a is on thread 1's stack
==21607== in frame #2, created by drmModeSetCrtc (???:)
==21607== Uninitialised value was created by a stack allocation
==21607== at 0x7B2782F: drm_output_choose_initial_mode (compositor-drm.c:4842)
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
[Pekka: switch to memset]
Reviewed-by: Daniel Stone <daniels@collabora.com>
Move it into to a new function. Following patches want to compute it
elsewhere as well.
No functional changes.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This function needs to reset the structures to NULL, otherwise it is not
possible to re-use a once "freed" property info array.
Being able to re-use an array is useful when the memory allocation and
array lifetimes do not match. A specific example is drm_output that is
changed to allocate the CRTC on enable() and deallocate it on disable().
A drm_output might be enabled and disabled multiple times.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
I need to destroy the list from more places, so factor out the common
bits. No functional changes.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Factor out drm_output_init_crtc() and drm_output_fini_crtc(), so that
the call sites can later be moved easily.
On fini, reset scanout_plane and cursor_plane to NULL, so that in the
future when the drm_output is not longer destroyed immediately after, we
free the planes for other use.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
[Pekka: set crtc_id/pipe at top, reset both on error]
Reviewed-by: Daniel Stone <daniels@collabora.com>
Move this bit of code into its own function. The caller of this already
cluttered and origcrtc is not used for anything else.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Let drm_output_enable() remove the CRTC and the connector from the
unused id arrays.
In the future when a list of drm_heads supersedes unused_connectors
array, the usedness of a connector will be determined by the enabled
state of the output the connector (head) is attached to. The enabled
state is turned on by drm_output_enable(). If unused_crtcs array was
still updated in drm_output_repaint(), the CRTC and connector usedness
would be tracked in different places. Logically the two belong together.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
In shared-CRTC clone mode there are several wl_output globals for one
weston_output. Only one panel and background is needed per
weston_output, so the extra wl_outputs do not get their own panel and
background.
When a head is unplugged, the corresponding wl_output is removed. If
that was the wl_output associated with the background and panel
surfaces, we must transfer the ownership to a remaining wl_output that
was a clone to avoid losing the background and panel completely.
The transfer relies on desktop-shell.so implementation to register
background and panel surfaces with the weston_output, not the
weston_head, so it does not actually matter the wl_output used to bind
the surfaces is going away.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
If for some reason the helper client weston-desktop-shell would create
more than one panel surface for the same weston_output, this code would
corrupt the surface destroy listener list by adding a link already in
one list into another list.
Instead, do not store the new, redundant panel surface and do not
subscribe to its destruction. Also, tell the helper that the surface is
redundant by configuring it with a 0x0 size, so that we don't waste
memory on a panel that is never used.
(Clone mode is a valid reason why weston-desktop-shell could do that.)
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
If for some reason the helper client weston-desktop-shell would create
more than one background surface for the same weston_output, this code
would corrupt the surface destroy listener list by adding a link already
in one list into another list.
Instead, do not store the new, redundant background surface and do not
subscribe to its destruction. Also, tell the helper that the surface is
redundant by configuring it with a 0x0 size, so that we don't waste
memory on a background that is never used.
(Clone mode is a valid reason why weston-desktop-shell could do that.)
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Guido Günther
Michael Tretter
Ilia Bozhinov
Jan Engelhardt
Marius Vlad
Derek Foreman
Pekka Paalanen
Daniel Stone
Emmanuel Gil Peyrot
Chris Wilson
Jason Gerecke
Greg V
Alexandros Frantzis
Emil Velikov
Emre Ucan