From 1da79e35bfeb74fdbc005143eb9a810238f82732 Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Wed, 28 Dec 2022 14:28:47 -0600
Subject: [PATCH] feat(time): add common time functions

---
 common/Time.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 common/Time.hpp | 12 +++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 common/Time.cpp
 create mode 100644 common/Time.hpp

diff --git a/common/Time.cpp b/common/Time.cpp
new file mode 100644
index 0000000..e31738d
--- /dev/null
+++ b/common/Time.cpp
@@ -0,0 +1,53 @@
+#include "common/Time.hpp"
+
+#if defined(WHOA_SYSTEM_WIN)
+#include <windows.h>
+#elif defined(WHOA_SYSTEM_MAC)
+#include <mach/mach_time.h>
+#include <unistd.h>
+#elif defined(WHOA_SYSTEM_LINUX)
+#include <chrono>
+#include <unistd.h>
+#endif
+
+uint64_t OsGetAsyncTimeMs() {
+#if defined(WHOA_SYSTEM_WIN)
+    return GetTickCount();
+
+#elif defined(WHOA_SYSTEM_MAC)
+    static mach_timebase_info_data_t timebase;
+
+    if (timebase.denom == 0) {
+        mach_timebase_info(&timebase);
+    }
+
+    uint64_t ticks = mach_absolute_time();
+
+    return ticks * (timebase.numer / timebase.denom) / 1000000;
+
+#elif defined(WHOA_SYSTEM_LINUX)
+    auto now = std::chrono::steady_clock::now();
+    uint64_t ticks = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()).count();
+    return ticks;
+#endif
+}
+
+uint64_t OsGetAsyncTimeMsPrecise() {
+#if defined(WHOA_SYSTEM_WIN)
+    // TODO QueryPerformanceCounter implementation
+    return OsGetAsyncTimeMs();
+
+#else
+    return OsGetAsyncTimeMs();
+#endif
+}
+
+void OsSleep(uint32_t duration) {
+#if defined(WHOA_SYSTEM_WIN)
+    Sleep(duration);
+#endif
+
+#if defined(WHOA_SYSTEM_MAC) || defined(WHOA_SYSTEM_LINUX)
+    usleep(duration);
+#endif
+}
diff --git a/common/Time.hpp b/common/Time.hpp
new file mode 100644
index 0000000..eadf02e
--- /dev/null
+++ b/common/Time.hpp
@@ -0,0 +1,12 @@
+#ifndef COMMON_TIME_HPP
+#define COMMON_TIME_HPP
+
+#include <cstdint>
+
+uint64_t OsGetAsyncTimeMs();
+
+uint64_t OsGetAsyncTimeMsPrecise();
+
+void OsSleep(uint32_t duration);
+
+#endif