Do not synchronize Unity game thread to SwapChain thread if the game thread is already running behind schedule.

Author: Kaldaien

CHANGELOG.txt

@@ -1,4 +1,9 @@
-26.4.15.3
+26.4.15.4
+=========
+ + Do not synchronize Unity game thread to SwapChain thread if the game thread
+     is already running behind schedule.
+
+26.4.15.3
 =========
  + Eliminate potential hitch during asset loads when Unity Game Thread Pacing
      is enabled.

include/SpecialK/DLL_VERSION.H

@@ -3,8 +3,8 @@
 #define SK_YEAR  26
 #define SK_MONTH 4
 #define SK_DATE  15
-#define SK_REV_N 3
-#define SK_REV   3
+#define SK_REV_N 4
+#define SK_REV   4
 
 #ifndef _A2
 #define _A2(a)     #a

src/render/dxgi/dxgi_swapchain.cpp

@@ -1210,12 +1210,15 @@ IWrapDXGISwapChain::GetFrameStatistics (DXGI_FRAME_STATISTICS *pStats)
           const auto next_tick =
             pLimiter->get_next_tick ();
 
-          WaitForSingleObject (SK_Unity_GetFrameStatsWaitEvent, 2UL);
+          // Do not sync to SwapChain thread if the game thread is already behind schedule.
+          if (SK_QueryPerf ().QuadPart < next_tick)
+            WaitForSingleObject (SK_Unity_GetFrameStatsWaitEvent, 3UL);
 
           const auto ticks_per_half_ms =
             static_cast <LONG64> (SK_QpcTicksPerMs) / 2LL;
 
-          if (next_tick - ticks_per_half_ms / 2LL > SK_QueryPerf ().QuadPart)
+          // This needs cleaning up.
+          if (  next_tick - ticks_per_half_ms / 2LL > SK_QueryPerf ().QuadPart)
           { if (next_tick > SK_QueryPerf ().QuadPart + ticks_per_half_ms / 2LL)
               SK_Framerate_WaitUntilQPC ( next_tick  - ticks_per_half_ms / 2LL, hTimer );
           }