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, 6 insertions, 0 deletions

diff --git a/cogl/cogl-context-private.h b/cogl/cogl-context-private.h
index 2780a59d..4c383545 100644
--- a/cogl/cogl-context-private.h
+++ b/cogl/cogl-context-private.h
@@ -50,6 +50,7 @@
 #include "cogl-gpu-info-private.h"
 #include "cogl-gl-header.h"
 #include "cogl-framebuffer-private.h"
+#include "cogl-onscreen-private.h"
 
 typedef struct
 {
@@ -190,6 +191,11 @@ struct _CoglContext
   gboolean have_last_offscreen_allocate_flags;
   CoglOffscreenAllocateFlags last_offscreen_allocate_flags;
 
+  GHashTable *swap_callback_closures;
+  int next_swap_callback_id;
+
+  CoglOnscreenEventList onscreen_events_queue;
+
   CoglGLES2Context *current_gles2_context;
   GQueue gles2_context_stack;