compositor-drm: deliver frame seq for feedback
Add 'msc' field to weston_output to maintain the refresh counter, and
use it in presentation_feedback.presented.
Make compositor-drm update the per-output refresh counter with the
values reported by DRM. If the DRM reported value jumps backwards,
assume it wrapped around once.
Other backends do not update weston_output::msc, and there
presentation_feedback will always deliver refresh counter as zero.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
v3 Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index 626a2de..07b83a7 100644
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -726,6 +726,17 @@
}
static void
+drm_output_update_msc(struct drm_output *output, unsigned int seq)
+{
+ uint64_t msc_hi = output->base.msc >> 32;
+
+ if (seq < (output->base.msc & 0xffffffff))
+ msc_hi++;
+
+ output->base.msc = (msc_hi << 32) + seq;
+}
+
+static void
vblank_handler(int fd, unsigned int frame, unsigned int sec, unsigned int usec,
void *data)
{
@@ -733,6 +744,7 @@
struct drm_output *output = s->output;
struct timespec ts;
+ drm_output_update_msc(output, frame);
output->vblank_pending = 0;
drm_output_release_fb(output, s->current);
@@ -756,6 +768,8 @@
struct drm_output *output = (struct drm_output *) data;
struct timespec ts;
+ drm_output_update_msc(output, frame);
+
/* We don't set page_flip_pending on start_repaint_loop, in that case
* we just want to page flip to the current buffer to get an accurate
* timestamp */