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output: allow tearing with atomic mode setting

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Additionally, track errors and abandon the tearing allowance when it
cannot be set for two-seconds' worth of consecutive frames.
This commit is contained in:
Christopher Snowhill 2024-07-17 17:10:04 -07:00 • committed by Andrew J. Hesford
parent 14d9bbab90
commit d033a2fbf6
4 changed files with 42 additions and 15 deletions
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37
src/output.c
View file

@ -30,6 +30,14 @@
#include "view.h"
#include "xwayland.h"
static unsigned int
get_tearing_retry_count(struct output *output)
{
/* Two seconds worth of frames, guessing 60Hz if refresh is invalid */
int refresh = output->wlr_output->refresh;
return refresh > 0 ? refresh / 500 : 120;
}
static bool
get_tearing_preference(struct output *output)
{
@ -45,6 +53,11 @@ get_tearing_preference(struct output *output)
return false;
}
/* Tearing should not have failed too many times */
if (output->nr_tearing_failures >= get_tearing_retry_count(output)) {
return false;
}
/* If the active view requests tearing, or it is toggled on with action, allow it */
return server->active_view->tearing_hint;
}
@ -112,11 +125,27 @@ output_frame_notify(struct wl_listener *listener, void *data)
*/
output_apply_gamma(output);
} else {
output->pending.tearing_page_flip =
get_tearing_preference(output);
struct wlr_scene_output *scene_output = output->scene_output;
struct wlr_output_state *pending = &output->pending;
lab_wlr_scene_output_commit(output->scene_output,
&output->pending);
pending->tearing_page_flip = get_tearing_preference(output);
bool committed =
lab_wlr_scene_output_commit(scene_output, pending);
if (pending->tearing_page_flip) {
if (committed) {
output->nr_tearing_failures = 0;
} else {
if (++output->nr_tearing_failures >=
get_tearing_retry_count(output)) {
wlr_log(WLR_INFO, "setting tearing allowance failed "
"for two consecutive seconds, disabling");
}
pending->tearing_page_flip = false;
lab_wlr_scene_output_commit(scene_output, pending);
}
}
}
struct timespec now = { 0 };