[client] report presentation cadence over LGMP

client/displayservers/Wayland/presentation.c

@@ -56,6 +56,8 @@ static void presentationFeedbackPresented(void * opaque,
     uint32_t tvNsec, uint32_t refresh, uint32_t seqHi, uint32_t seqLo, uint32_t flags)
 {
   struct FrameData * data = opaque;
+  if (refresh)
+    atomic_store(&wlWm.presentationPeriod, refresh);
   struct timespec present = {
     .tv_sec = (uint64_t) tvSecHi << 32 | tvSecLo,
     .tv_nsec = tvNsec,
@@ -69,6 +71,16 @@ static void presentationFeedbackPresented(void * opaque,
   wp_presentation_feedback_destroy(feedback);
 }
 
+bool waylandGetFramePeriod(uint64_t * period)
+{
+  const uint64_t value = atomic_load(&wlWm.presentationPeriod);
+  if (!value)
+    return false;
+
+  *period = value;
+  return true;
+}
+
 static void presentationFeedbackDiscarded(void * data,
     struct wp_presentation_feedback * feedback)
 {

client/displayservers/Wayland/wayland.c

@@ -314,6 +314,7 @@ struct LG_DisplayServerOps LGDS_Wayland =
   .waitFrame           = waylandWaitFrame,
   .skipFrame           = waylandSkipFrame,
   .stopWaitFrame       = waylandStopWaitFrame,
+  .getFramePeriod      = waylandGetFramePeriod,
   .guestPointerUpdated = waylandGuestPointerUpdated,
   .setPointer          = waylandSetPointer,
   .grabPointer         = waylandGrabPointer,

client/displayservers/Wayland/wayland.h

@@ -158,6 +158,7 @@ struct WaylandDSState
 
   struct wp_presentation * presentation;
   clockid_t clkId;
+  _Atomic(uint64_t) presentationPeriod;
   RingBuffer photonTimings;
   GraphHandle photonGraph;
 
@@ -399,6 +400,7 @@ bool waylandPollUnregister(int fd);
 bool waylandPresentationInit(void);
 void waylandPresentationFrame(void);
 void waylandPresentationFree(void);
+bool waylandGetFramePeriod(uint64_t * period);
 
 // registry module
 bool waylandRegistryInit(void);

client/displayservers/X11/x11.c

@@ -1487,6 +1487,15 @@ static void x11XPresentEvent(XGenericEventCookie *cookie)
     case PresentCompleteNotify:
     {
       XPresentCompleteNotifyEvent * e = cookie->data;
+      const uint64_t previousMsc = atomic_load(&x11.presentMsc);
+      const uint64_t previousUst = atomic_load(&x11.presentUst);
+      if (previousMsc && e->msc > previousMsc && e->ust > previousUst)
+      {
+        const uint64_t period =
+          (e->ust - previousUst) * 1000 / (e->msc - previousMsc);
+        if (period)
+          atomic_store(&x11.presentPeriod, period);
+      }
       x11DoPresent(e->msc);
       atomic_store(&x11.presentMsc, e->msc);
       atomic_store(&x11.presentUst, e->ust);
@@ -1496,6 +1505,16 @@ static void x11XPresentEvent(XGenericEventCookie *cookie)
   }
 }
 
+static bool x11GetFramePeriod(uint64_t * period)
+{
+  const uint64_t value = atomic_load(&x11.presentPeriod);
+  if (!value)
+    return false;
+
+  *period = value;
+  return true;
+}
+
 #ifdef ENABLE_EGL
 static EGLDisplay x11GetEGLDisplay(void)
 {
@@ -2025,6 +2044,7 @@ struct LG_DisplayServerOps LGDS_X11 =
 #endif
   .waitFrame           = x11WaitFrame,
   .stopWaitFrame       = x11StopWaitFrame,
+  .getFramePeriod      = x11GetFramePeriod,
   .guestPointerUpdated = x11GuestPointerUpdated,
   .setPointer          = x11SetPointer,
   .grabPointer         = x11GrabPointer,

client/displayservers/X11/x11.h

@@ -75,6 +75,7 @@ struct X11DSState
   int               xpresentOp;
   bool              jitRender;
   _Atomic(uint64_t) presentMsc, presentUst;
+  _Atomic(uint64_t) presentPeriod;
   uint32_t          presentSerial;
   Pixmap            presentPixmap;
   XserverRegion     presentRegion;