glx/dri3: Implement LIBGL_SHOW_FPS=1 for DRI3/Present.

v2: Use the UST value provided in the PRESENT_COMPLETE_NOTIFY event
    rather than gettimeofday(), which gives us the presentation time
    instead of the time when SwapBuffers was called.  Suggested by
    Keith Packard.  This relies on the fact that the X DRI3/Present
    implementations use microseconds for UST.

v3: Properly ignore PresentCompleteKindMSCNotify; multiply in 64 bits
    (caught by Keith Packard).

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Keith Packard <[email protected]> [v3]
Reviewed-by: Marek Olšák <[email protected]> [v1]

1 files changed, 5 insertions, 1 deletions

diff --git a/src/glx/dri3_priv.h b/src/glx/dri3_priv.h
index bdfe224fed0..8e466407b89 100644
--- a/src/glx/dri3_priv.h
+++ b/src/glx/dri3_priv.h
@@ -138,7 +138,7 @@ struct dri3_screen {
    int fd;
    int is_different_gpu;
 
-   Bool show_fps;
+   int show_fps_interval;
 };
 
 struct dri3_context
@@ -198,6 +198,10 @@ struct dri3_drawable {
    xcb_present_event_t eid;
    xcb_gcontext_t gc;
    xcb_special_event_t *special_event;
+
+   /* LIBGL_SHOW_FPS support */
+   uint64_t previous_ust;
+   unsigned frames;
 };