clients: add presentation-shm demo

This started as a copy of simple-shm.c before it was converted to
xdg_shell.

This demo excercises the presentation feedback interface in five
different modes:

- A continuous repaint loop triggered by frame callbacks, and using
  immediate commits, just gathering presentation feedback and computing
  some time intervals for statistics.

- The same as above, except with 1s sleep before actually repainting as
  a response to frame callback. This tests how well the compositor can
  do a repaint from idle state (not continuously repainting), assuming
  nothing else is causing repaints.

- A continuous repaint loop triggered by 'presented' events rather than
  by frame callbacks. If Weston uses an appropriate scheduling
  algorithm, this mode achieves the smallest possible frame latency
  (below one output refresh period).

In all modes, all frames are pre-rendered at startup, so no rendering
happens during the animation.

[Louis-Francis Ratté-Boulianne: split queuing feature]

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index fbffaa5b..d521bcc4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,6 +45,7 @@ weston-gears
 weston-image
 weston-nested
 weston-nested-client
+weston-presentation-shm
 weston-resizor
 weston-scaler
 weston-simple-egl