1 files changed, 100 insertions, 0 deletions
diff --git a/compat/timer.hpp b/compat/timer.hpp
new file mode 100644
index 00000000..300a883c
--- /dev/null
+++ b/compat/timer.hpp
@@ -0,0 +1,100 @@
+/* Copyright (c) 2014-2015, Stanislaw Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this
+ * software for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice and this permission
+ * notice appear in all copies.
+ */
+
+#pragma once
+#include <ctime>
+
+#include "export.hpp"
+
+#if defined (_WIN32)
+#   include <windows.h>
+#	ifndef CLOCK_MONOTONIC
+#   	define CLOCK_MONOTONIC -1
+#	endif
+static inline void opentrack_clock_gettime(int, struct timespec* ts)
+{
+    static LARGE_INTEGER freq;
+
+    if (!freq.QuadPart)
+        (void) QueryPerformanceFrequency(&freq);
+
+    LARGE_INTEGER d;
+
+    (void) QueryPerformanceCounter(&d);
+
+    using ll = long long;
+    using ld = long double;
+    const long long part = ll(d.QuadPart / ld(freq.QuadPart) * 1000000000.L);
+    using t_s = decltype(ts->tv_sec);
+    using t_ns = decltype(ts->tv_nsec);
+
+    ts->tv_sec = t_s(part / 1000000000LL);
+    ts->tv_nsec = t_ns(part % 1000000000LL);
+}
+#	define clock_gettime opentrack_clock_gettime
+#else
+#   if defined(__MACH__)
+#       define CLOCK_MONOTONIC 0
+#       include <inttypes.h>
+#       include <mach/mach_time.h>
+static inline void clock_gettime(int, struct timespec* ts)
+{
+    static mach_timebase_info_data_t    sTimebaseInfo;
+    uint64_t state, nsec;
+    if ( sTimebaseInfo.denom == 0 ) {
+        (void) mach_timebase_info(&sTimebaseInfo);
+    }
+    state = mach_absolute_time();
+    nsec = state * sTimebaseInfo.numer / sTimebaseInfo.denom;
+    ts->tv_sec = nsec / 1000000000L;
+    ts->tv_nsec = nsec % 1000000000L;
+}
+#   endif
+#endif
+class Timer
+{
+private:
+    struct timespec state;
+    long long conv_nsecs(const struct timespec& cur) const
+    {
+        return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
+    }
+    long conv_usecs(const struct timespec& cur) const
+    {
+        return long(cur.tv_sec - state.tv_sec) * 1000000L + long(cur.tv_nsec - state.tv_nsec) / 1000l;
+    }
+public:
+    Timer()
+    {
+        start();
+    }
+    void start()
+    {
+        clock_gettime(CLOCK_MONOTONIC, &state);
+    }
+    long long elapsed_nsecs() const
+    {
+        struct timespec cur;
+        clock_gettime(CLOCK_MONOTONIC, &cur);
+        return conv_nsecs(cur);
+    }
+    long elapsed_usecs() const
+    {
+        struct timespec cur;
+        clock_gettime(CLOCK_MONOTONIC, &cur);
+        return long(conv_usecs(cur));
+    }
+    long elapsed_ms() const
+    {
+        return elapsed_usecs() / 1000L;
+    }
+    double elapsed_seconds() const
+    {
+        return double(elapsed_nsecs() * 1e-9L);
+    }
+};