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output: add max_render_time

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Ivan Molodetskikh 2019-09-25 13:58:27 +03:00 • committed by Simon Ser
parent cb905effde
commit 022df2542b
10 changed files with 166 additions and 22 deletions
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sway/sway-output.5.scd
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@ -107,6 +107,30 @@ must be separated by one space. For example:
Enables or disables the specified output via DPMS. To turn an output off
(ie. blank the screen but keep workspaces as-is), one can set DPMS to off.
*output* <name> max_render_time off|<msec>
When set to a positive number of milliseconds, enables delaying output
rendering to reduce latency. The rendering is delayed in such a way as
to leave the specified number of milliseconds before the next
presentation for rendering.
The output rendering normally takes place immediately after a
presentation (vblank, buffer flip, etc.) and the frame callbacks are
sent to surfaces immediately after the rendering to give surfaces the
most time to draw their next frame. This results in slightly below 2
frames of latency between the surface rendering and committing new
contents, and the contents being shown on screen, on average. When the
output rendering is delayed, the frame callbacks are sent immediately
after presentation, and the surfaces have a small timespan (1 /
(refresh rate) - max_render_time) to render and commit new contents to
be shown on the next presentation, resulting in below 1 frame of
latency.
To set this up for optimal latency:
. Launch some _full-screen_ application that renders continuously, like
*glxgears*.
. Start with *max_render_time 1*. Increment by *1* if you see frame
drops.
# SEE ALSO
*sway*(5) *sway-input*(5)