src/platform/win32_clock.c

@@ -18,6 +18,8 @@ extern "C"
 
     static u64 __performanceCounterFreq = 0;
 
+    const u64 WIN_EPOCH_TO_UNIX_EPOCH_100NS = 116444736000000000; // number of 100ns from Jan 1, 1601 (windows epoch) to  Jan 1, 1970 (unix epoch)
+
     void oc_clock_init()
     {
         LARGE_INTEGER freq;
@@ -26,6 +28,10 @@ extern "C"
     }
 
     f64 oc_clock_time(oc_clock_kind clock)
+    {
+        switch(clock)
+        {
+            case OC_CLOCK_MONOTONIC:
             {
                 LARGE_INTEGER counter;
                 QueryPerformanceCounter(&counter);
@@ -34,6 +40,33 @@ extern "C"
                 return (time);
             }
 
+            case OC_CLOCK_UPTIME:
+            {
+                LONGLONG unbiasedTime100Ns;
+                if(QueryUnbiasedInterruptTime(&unbiasedTime100Ns))
+                {
+                    f64 unbiasedTimeSecs = ((f64)unbiasedTime100Ns) / (10 * 1000 * 1000);
+                    return unbiasedTimeSecs;
+                }
+                oc_log_error("OC_CLOCK_UPTIME syscall failed with error: %d", GetLastError());
+                return 0;
+            }
+
+            case OC_CLOCK_DATE:
+            {
+                FILETIME ft;
+                GetSystemTimeAsFileTime(&ft);
+
+                u64 systemTime100Ns = ((u64)ft.dwHighDateTime << 32) | (u64)ft.dwLowDateTime;
+                u64 timestamp100Ns = systemTime100Ns - WIN_EPOCH_TO_UNIX_EPOCH_100NS;
+                f64 timeSecs = ((f64)timestamp100Ns) / (10 * 1000 * 1000);
+                return timeSecs;
+            }
+        }
+
+        return 0.0;
+    }
+
 #ifdef __cplusplus
 } // extern "C"
 #endif