Add a render_statistics type to encapsulate all the statistics done on
rendering times. And use that to estimate the time budget for rendering
and frame pacing.
Tweak the rolling window utilities a bit so we can reuse one rolling
window for multiple statistics.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
We only checked render time. If we don't have frame time estimates, we
would divide by zero and end up with wild scheduling delays.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
So when the screen is off, we calls queue_redraw, hoping draw_callback
will be called and unredirects the screen. However, queue_redraw doesn't
queue another redraw when one is already queued. Redraws can be queued
in two ways: one is timer based, which is fine, because it will be
triggered no matter what; the other is frame based, which is triggered
by Present events.
When the screen is off, X server, depends on the driver, could send
abnormal Present events, which we ignore. But that also means queued
frame based redraw will stop being triggered.
Those two factors combined means sometimes unredirection does not happen
when the screen is off. Which means we aren't going to free the GL
context, which are still receiving Present events, but can't handle
them, because we are not rendering anything with GL. In the end all
these causes memory usage to balloon, until the screen is turned on and
we start rendering again.
And all these is not caught by leak checkers because this technically is
not a leak, as everything is eventually freed.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Sometimes X sends bogus complete notifies with invalid msc number.
Instead use a saved msc number to get the next complete notify.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Timer can sometimes drift randomly, like when the system is suspended.
we don't want to disable frame pacing for that
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
When the screen turns off, X sometimes sends present complete notify for
the same frame multiple times, or even events with invalid msc/ust
number.
This will cause us to ignore it and not send a subsequent NotifyMsc
request, causing the complete notify to stop.
Now we send NotifyMsc regardless to keep the events going.
Also detect when the complete notifies skip frames, divide the interval
by frame count to estimate frame time in that case.
Upstream bug report:
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1418
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Use frame timing and render time statistic to pace frames.
Right now the criteria are simple:
* Don't render multiple frames in one vblank cycle. Otherwise the
rendered frame will be delay multiple cycles, which isn't ideal.
* Start rendering as late as possible while still hitting vblank.
Refresh rate is estimated from a rolling average of frame timing. Render
time is predicted from the rolling maximum of past 128 frames. The
window size still needs to be investigated.
Remove glFinish calls and GL_MaxFramesAllowed=1, frame pacing superseeds
them.
Professionals might laugh at how rudimentary this is, but hopefully this
is better than what we had before. Which is absolutely nothing at all.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
We only considered residual in the positive direction, i.e. we would set
dithering to zero if the color is (whole number + 0.0001). But we should
also set dithering to zero if color is (whole number - 0.0001).
Fixes#1064
This option accepts a list of patterns and overrides the corner radii of
matching windows
Authored-by: oofsauce <alanpanayotov@gmail.com>
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
there are two x extensions for working with monitors (especially
multiple): xinerama and randr. xinerama is old, feature-poor and in
general isn't used anymore compared to the randr: new, feature-rich and
widely-used. for some reason we were using both of them, so let's drop
xinerama to keep things simple, clean and small. and to be modern.
the drop was done in three steps:
* first step was to replace all the xinerama-based code with the
randr-based one and to replace or remove all the xinerama mentions;
* second step was to replace the xinerama's terminology with the
randr's one. xinerama was referring only to the word "screen", while
randr refers to multiple words and i think the word "monitor" is the
most suitable for us and, hopefully, clear both to a contributor and
to an end user;
* third step was to refactor the new randr-based code if needed and to
address related todo's (mostly about moving related functions
elsewhere).
all the steps were done well except addressing a leftover todo about
moving the win_update_monitor function to the x.c which wasn't done.
the xinerama-shadow-crop option was renamed to crop-shadow-to-monitor,
but it's previous name is still accepted, has effect and the
deprecation message is printed to preserve backwards-compatibility.
Use the DPMS extension to detect if screen is turned off, and unredirect
if it is. This also helps working around the problem where OpenGL
buffers lose data when screen is turned off, causing screen to flicker
later when it turns back on if use-damage is enabled.
Unfortunately the DPMS extension doesn't define an event, so we have to
periodically poll the screen state.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
