Reduced the amount of time SK's framerate limiter spends busy-waiting for common FPS targets.

Author: Kaldaien

CHANGELOG.txt

@@ -1,4 +1,9 @@
-26.4.17.1
+26.4.17.2
+=========
+ + Reduced the amount of time SK's framerate limiter spends busy-waiting for
+     common FPS targets (very high framerates always require busy-wait).
+
+26.4.17.1
 =========
  + Fixed Reflex Low Latency mode not working to limit VRR
      framerate in Unity games.

include/SpecialK/DLL_VERSION.H

@@ -3,8 +3,8 @@
 #define SK_YEAR  26
 #define SK_MONTH 4
 #define SK_DATE  17
-#define SK_REV_N 1
-#define SK_REV   1
+#define SK_REV_N 2
+#define SK_REV   2
 
 #ifndef _A2
 #define _A2(a)     #a

src/framerate.cpp

@@ -82,7 +82,7 @@ enum class SK_LimitApplicationSite {
   EndOfFrame // = 4 (Default)
 };
 
-float fSwapWaitRatio = 3.33f;
+float fSwapWaitRatio = 1.125f;
 float fSwapWaitFract = 0.66f;
 
 float
@@ -2545,14 +2545,9 @@ SK::Framerate::Limiter::wait (void)
       LARGE_INTEGER
         liDelay
           { .QuadPart =
-              std::min (
                 static_cast <LONGLONG> (
                   to_next_in_secs * 1000.0 - timer_res_ms * fSwapWaitRatio
-                                       ),
-                static_cast <LONGLONG> (
-                  to_next_in_secs * 1000.0 * fSwapWaitFract
                                        )
-                       )
           };
 
         liDelay.QuadPart =
@@ -2597,7 +2592,7 @@ SK::Framerate::Limiter::wait (void)
           to_next_in_secs =
             std::max (0.0, SK_RecalcTimeToNextFrame ());
 
-          if (static_cast <double> (-liDelay.QuadPart) / 10000.0 > timer_res_ms * 2.0)
+          if (static_cast <double> (-liDelay.QuadPart) / 10000.0 > timer_res_ms * 1.333)
             hWaitObjs [iWaitObjs++] = timer_wait.m_h;
 
           if (iWaitObjs == 0)
@@ -4923,14 +4918,9 @@ SK_Framerate_WaitUntilQPC (LONGLONG llQPC, HANDLE& hTimer)
     LARGE_INTEGER
       liDelay
         { .QuadPart =
-            std::min (
               static_cast <LONGLONG> (
                 to_next_in_secs * 1000.0 - SK::Framerate::Limiter::timer_res_ms * fSwapWaitRatio
-                                     ),
-              static_cast <LONGLONG> (
-                to_next_in_secs * 1000.0 * fSwapWaitFract
                                      )
-                     )
         };
 
       liDelay.QuadPart =
@@ -4946,7 +4936,7 @@ SK_Framerate_WaitUntilQPC (LONGLONG llQPC, HANDLE& hTimer)
                                           0, nullptr, nullptr,
                                              FALSE ) )
     { 
-      if (static_cast <double> (-liDelay.QuadPart) / 10000.0 > SK::Framerate::Limiter::timer_res_ms * 2.0)
+      if (static_cast <double> (-liDelay.QuadPart) / 10000.0 > SK::Framerate::Limiter::timer_res_ms * 1.333)
       {
         to_next_in_secs =
           static_cast <double> (llQPC - SK_QueryPerf ().QuadPart) /