onscreen: Add CoglFrameInfo and _add_frame_callback() api

Add a CoglFrameInfo object that tracks timing information for frames
that are drawn. We track a frame counter and frame timing information
for each CoglOnscreen. Internally a CoglFrameInfo is automatically
created for each frame, delimited by cogl_onscreen_swap_buffers() or
cogl_onscreen_swap_region() calls.

CoglFrameInfos are delivered to applications via frame event callbacks
that can be registered with a new cogl_onscreen_add_frame_callback()
api. Two initial event types (dispatched on all platforms) have been
defined; a _SYNC event used for throttling the frame rate of
applications and a _COMPLETE event used so signify the end of a frame.

Note: This new _add_frame_callback() api makes the
cogl_onscreen_add_swap_complete_callback() api redundant and so it
should be considered deprecated. Since the _add_swap_complete_callback()
api is still experimental api, we will be looking to quickly migrate
users to the new api so we can remove the old api.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 700401667db2522045e4623d78797b17f9184501)

1 files changed, 3 insertions, 0 deletions

diff --git a/cogl/cogl-types.h b/cogl/cogl-types.h
index f1f281da..227b7ec8 100644
--- a/cogl/cogl-types.h
+++ b/cogl/cogl-types.h
@@ -832,6 +832,9 @@ typedef enum _CoglWinsysFeature
   /* Avaiable if the age of the back buffer can be queried */
   COGL_WINSYS_FEATURE_BUFFER_AGE,
 
+  /* Avaiable if the winsys directly handles _SYNC and _COMPLETE events */
+  COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT,
+
   COGL_WINSYS_FEATURE_N_FEATURES
 } CoglWinsysFeature;